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Akebia Therapeutics, Inc.

akba · NASDAQ Healthcare
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FY2022 Annual Report · Akebia Therapeutics, Inc.
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K

(Mark One)

☒

☐

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2022

OR

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _to_

Commission File Number 001-36352

AKEBIA THERAPEUTICS, INC.

(Exact name of registrant as specified in its charter)

Delaware
(State or other jurisdiction of
incorporation or organization)

 245 First Street, Cambridge, MA
(Address of principal executive offices)

20-8756903
(I.R.S. Employer
Identification No.)

02142
(Zip Code)

Registrant’s telephone number, including area code: (617) 871-2098

Title of each class
Common Stock, par value $0.00001 per share

Trading Symbol(s)
AKBA

Name of each exchange on which registered
The Nasdaq Capital Market

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ☐ No  ☒   

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act.    Yes  ☐ No  ☒

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the
preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past
90 days.    Yes  ☒ No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§
232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes ☒ No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth
company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange
Act.

Large accelerated filer
Non-accelerated filer

☐
☐

Accelerated filer
Smaller reporting company
Emerging growth company

☒
☐
☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised
financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial
reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒
If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the
correction of an error to previously issued financial statements. ☐
Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the
registrant’s executive officers during the relevant recovery period pursuant to § 240.10D-1(b). ☐ Indicate by check mark whether registrant is a shell company (as defined in
Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant, based on the closing price of the registrant’s Common Stock
on The Nasdaq Global Market on June 30, 2022, was $64,134,957.

The number of shares of registrant’s Common Stock outstanding as of February 28, 2023 was 184,248,045.

The registrant intends to file a definitive proxy statement pursuant to Regulation 14A in connection with its 2023 Annual Meeting of Stockholders within 120 days after the
end of the registrant’s fiscal year ended December 31, 2022. Portions of the proxy statement are incorporated by reference into Part III of this Annual Report on Form 10-K.

DOCUMENTS INCORPORATED BY REFERENCE

 
 
 
 
 
 
 
 
TABLE OF CONTENTS

Business
Risk Factors
Unresolved Staff Comments
Properties
Legal Proceedings
   Mine Safety Disclosures

   Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

[Reserved]

   Management’s Discussion and Analysis of Financial Condition and Results of Operations

Quantitative and Qualitative Disclosures About Market Risk
Financial Statements and Supplementary Data
Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
Controls and Procedures
Other Information
Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

Directors, Executive Officers and Corporate Governance
Executive Compensation
Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
Certain Relationships and Related Transactions, and Director Independence
Principal Accountant Fees and Services

Exhibits and Financial Statement Schedules
Form 10-K Summary

PART I
Item 1.
Item 1A.
Item 1B.
Item 2.
Item 3.
Item 4.
PART II
Item 5.
Item 6.
Item 7.
Item 7A.
Item 8.
Item 9.
Item 9A.
Item 9B.
Item 9C.
PART III
Item 10.
Item 11.
Item 12.
Item 13.
Item 14.
PART IV
Item 15.
Item 16.
SIGNATURES

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NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K contains forward-looking statements that are being made pursuant to the provisions of the U.S. Private Securities
Litigation Reform Act of 1995 with the intention of obtaining the benefits of the “safe harbor” provisions of that Act. All statements contained in this
Annual Report on Form 10-K other than statements of historical fact are forward-looking statements. These forward-looking statements may be
accompanied by words such as “anticipate,” “believe,” “build,” “can,” “contemplate,” “continue,” “could,” “should,” “designed,” “estimate,” “project,”
“expect,” “forecast,” “future,” “goal,” “intend,” “likely,” “may,” “plan,” “possible,” “potential,” “predict,” “strategy,” “seek,” “target,” “will,” “would,” and
other words and terms of similar meaning, but the absence of these words does not necessarily mean that a statement is not forward-looking. These
forward-looking statements include, but are not limited to, statements about:

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the potential therapeutic benefits, safety profile, and effectiveness of vadadustat; 

our expectations with respect to the development of vadadustat, if any, following our receipt of a complete response letter to our new
drug application for vadadustat for the treatment of anemia due to chronic kidney disease in adult patients, including the timing of a
potential response to the Formal Dispute Resolution Request from the U.S. Food and Drug Administration;

that delivering value broadly to the kidney community, as well as others who may benefit from our medicines, will result in delivering
value for stockholders;

our pipeline and portfolio, including its potential, and our related research and development activities;

the timing of or likelihood of regulatory filings and approvals, including with respect to labeling or other restrictions, the potential
approval of vadadustat and our outlook related thereto, and potential indications for vadadustat;

the timing, investment and associated activities involved in continued commercialization of Auryxia  (ferric citrate), its growth
opportunities and our ability to execute thereon;
the potential indications, demand and market opportunity, potential and acceptance of Auryxia and vadadustat, if approved, including the
size of eligible patient populations; 

®

the potential therapeutic applications of the hypoxia inducible factor pathway;

our competitive position, including estimates, developments and projections relating to our competitors and their products and product
candidates, and our industry; 

our expectations, projections and estimates regarding our capital requirements, need for additional capital, financing our future cash
needs, costs, expenses, revenues, capital resources, cash flows, financial performance, profitability, tax obligations, liquidity, growth,
contractual obligations, the period of time our cash resources and collaboration funding will fund our current operating plan, estimates
with respect to our ability to operate as a going concern, our internal control over financial reporting and disclosure controls and
procedures, and any future deficiencies or material weaknesses in our internal controls and procedures; 

the direct or indirect impacts of the COVID-19 pandemic on our business, operations and the markets and communities in which we and
our partners, collaborators, vendors, and customers operate;

our manufacturing, supply and quality matters and any recalls, write-downs, impairments or other related consequences or potential
consequences;
estimates, beliefs and judgments related to the valuation of intangible assets, goodwill, debt and other assets and liabilities, including our
impairment analysis and our methodology and assumptions regarding fair value measurements;

the timing of the availability and disclosure of clinical trial data and results;

our and our collaborators’ strategy, plans and expectations with respect to the development, manufacturing, supply, commercialization,
launch, marketing and sale of Auryxia and vadadustat, if approved, and the associated timing thereof; 

the designs of our studies, and the type of information and data expected from our studies and the expected benefits thereof;

our ability to maintain any marketing authorizations we currently hold or will obtain, including our marketing authorizations for Auryxia
and our ability to complete post-marketing requirements with respect thereto;

our ability to negotiate, secure and maintain adequate pricing, coverage and reimbursement terms and processes on a timely basis, or at
all, with third-party payors for Auryxia and vadadustat, if approved;

the timing of initiation of our clinical trials and plans to conduct preclinical studies and clinical trials in the future; 

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the timing and amounts of payments from or to our collaborators and licensees, and the anticipated arrangements and benefits under our
collaboration and license agreements, including with respect to milestones and royalties; 

our intellectual property position, including obtaining and maintaining patents, and the timing, outcome and impact of administrative,
regulatory, legal and other proceedings relating to our patents and other proprietary and intellectual property rights, patent infringement
suits that we have filed or may file, or other actions that we may take against companies, and the timing and resolution thereof;

expected ongoing reliance on third parties, including with respect to the development, manufacturing, supply and commercialization of
Auryxia and vadadustat, if approved;

accounting standards and estimates, their impact, and their expected timing of completion;

estimated periods of performance of key contracts;

our facilities, lease commitments, and future availability of facilities;

cybersecurity;

insurance coverage;

management of personnel, including our management team, and our employees, including employee compensation, employee relations,
and our ability to attract, train and retain high quality employees;

the implementation of our business model, current operating plan, and strategic plans for our business, product candidates and
technology, and business development opportunities including potential collaborations, alliances, mergers, acquisitions or licensing of
assets;

our workforce reductions, future charges expected to be incurred in connection therewith and estimated reductions in net cash required
for operating activities in connection therewith; and

the timing, outcome and impact of current and any future legal proceedings.

Any or all of these forward-looking statements in this Annual Report on Form 10-K may turn out to be inaccurate. These forward-looking statements
involve risks and uncertainties, including those that are discussed below under the heading "Risk Factor Summary," and the risk factors detailed further in
Part I, Item 1A. "Risk Factors" included in this Annual Report on Form 10-K and elsewhere in this Annual Report on Form 10-K and in our Securities and
Exchange Commission reports filed after this report, that could cause our actual results, financial condition, performance or achievements to be materially
different from those indicated in these forward-looking statements. Given these risks and uncertainties, you should not place undue reliance on these
forward-looking statements. Forward-looking statements speak only as of the date of this Annual Report on Form 10-K. Except as required by law, we
assume no obligation to publicly update or revise these forward-looking statements for any reason. Unless otherwise stated, our forward-looking statements
do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures or investments we may make.

This Annual Report on Form 10-K also contains estimates and other information concerning our industry and the markets for certain diseases, including
data regarding the estimated size of those markets, and the incidence and prevalence of certain medical conditions. Unless otherwise expressly stated, we
obtained this industry, market and other data from reports, research surveys, studies and similar data prepared by market research firms and other third
parties, industry, medical and general publications, government data and similar sources.
In this Annual Report on Form 10-K, unless otherwise stated or the context otherwise requires, references to “Akebia,” “we,” “us,” “our,” “the Company,”
and similar references refer to Akebia Therapeutics, Inc. and, where appropriate, its subsidiaries, including Keryx Biopharmaceuticals, Inc., or Keryx.

®

AURYXIA , AKEBIA Therapeutics , Vafseo  and their associated logos are trademarks of Akebia and/or its affiliates. All other trademarks, trade names
and service marks appearing in this Annual Report on Form 10-K are the property of their respective owners. All website addresses given in this Annual
Report on Form 10-K are for information only and are not intended to be an active link or to incorporate any website information into this document.

®

TM

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RISK FACTORS SUMMARY

Investing in our common stock involves numerous risks, including the risks summarized below and described in further detail in “Part I, Item 1A. Risk
Factors” of this Annual Report on Form 10-K, any one of which could materially adversely affect our business, financial condition, results of operations,
and prospects. These risks include, but are not limited to, the risks noted below.

• We have incurred significant losses since our inception, and anticipate that we will continue to incur significant losses and cannot guarantee when,

if ever, we will become profitable or attain positive cash flows.

• We will require substantial additional financing to achieve our goals. A failure to obtain this necessary capital when needed, or on acceptable

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terms, could force us to delay, limit, reduce or terminate our product development or commercialization efforts.
Raising additional capital may cause dilution to our existing stockholders, restrict our operations or require us to relinquish rights to our product
and product candidates on unfavorable terms to us.
If we fail to regain compliance with the continued listing requirements of Nasdaq, our common stock may be delisted and the price of our
common stock and our ability to access the capital markets could be negatively impacted.

• We may not be successful in our efforts to identify, acquire, in-license, discover, develop and commercialize additional products or product

candidates or our decisions to prioritize the development of certain product candidates over others may not be successful, which could impair our
ability to grow.

• We may engage in strategic transactions to acquire assets, businesses, or rights to products, product candidates or technologies or form

collaborations or make investments in other companies or technologies that could harm our operating results, dilute our stockholders’ ownership,
increase our debt, or cause us to incur significant expense.

• Our business has been and may continue to be, directly or indirectly, adversely affected by the COVID-19 pandemic.
• Our obligations in connection with the loan agreement with Pharmakon and requirements and restrictions in the loan agreement could adversely

affect our financial condition and restrict our operations.

• Our Royalty Interest Acquisition Agreement with HealthCare Royalty Partners IV, L.P. contains various covenants and other provisions, which, if

violated, could materially adversely affect our financial condition.

• Our business is substantially dependent on the commercial success of Auryxia. If we are unable to continue to successfully commercialize

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Auryxia, our results or operations and financial condition will be materially harmed.
If we are unable to maintain or expand, or, if vadadustat is approved, initiate, sales and marketing capabilities or enter into additional agreements
with third parties, we may not be successful in commercializing Auryxia, vadadustat, if approved, or any other product candidates that may be
approved.

• Our, or our partners', failure to obtain or maintain adequate coverage, pricing and reimbursement for Auryxia, vadadustat, if approved, or any

other future approved products, could have a material adverse effect on our or our collaboration partners’ ability to sell such approved products
profitably and otherwise have a material adverse impact on our business.

• We face substantial competition, which may result in others discovering, developing or commercializing products before, or more successfully

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TM

than, we do.
The commercialization of Riona
commercialization of our products and product candidates outside of the United States subject us to a variety of risks associated with international
operations, which could materially adversely affect our business.
Clinical drug development involves a lengthy and expensive process with an uncertain outcome, and we will incur additional costs in connection
with, and may experience delays in completing, or ultimately be unable to complete, the development and, if approved, commercialization of
vadadustat and any other product candidates.

 and Vafseo  in Japan and our current and potential future efforts with respect to the development and

TM

• We may find it difficult to enroll patients in our clinical trials, which could delay or prevent clinical trials of Auryxia, vadadustat or any other

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product or product candidate, including those that may be in-licensed or acquired.
Conducting clinical trials outside of the United States, as we have done historically and as we may decide to do in the future, presents additional
risks and complexities and, if we decide to conduct a clinical trial outside of the United States in the future, we may not complete such trials
successfully, in a timely manner, or at all, which could affect our ability to obtain regulatory approvals.

• Auryxia, vadadustat or any other product or product candidate, including those that may be in-licensed or acquired, may cause undesirable side

effects or have other properties that may delay or prevent marketing approval or limit their commercial potential.

• We may not be able to obtain marketing approval for, or successfully commercialize, vadadustat or any other product candidate, or we may

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experience significant delays in doing so, any of which would materially harm our business.
Products approved for marketing are subject to extensive post-marketing regulatory requirements and could be subject to post-marketing
restrictions or withdrawal from the market, and we may be subject to penalties, including withdrawal of marketing approval, if we fail to comply
with regulatory requirements or if we experience unanticipated problems with our products, or product candidates, when and if any of them is
approved.

• We are subject to a complex regulatory scheme that requires significant resources to ensure compliance and our failure to comply with applicable

laws could subject us to government scrutiny or enforcement, potentially resulting in costly investigations, fines, penalties or sanctions,
contractual damages, reputational harm, administrative burdens and diminished profits and future earnings.

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• We will incur significant liability if it is determined that we are promoting any “off-label” use of Auryxia or any other product we may develop,

in-license or acquire or if it is determined that any of our activities violates the federal Anti-Kickback Statute.

• Disruptions in the FDA, regulatory authorities outside the U.S. and other government agencies caused by global health concerns or funding

shortages could prevent new products and services from being developed or commercialized in a timely manner, which could negatively impact
our business.
Compliance with privacy and data security requirements could result in additional costs and liabilities to us or inhibit our ability to collect and
process data globally, and the failure to comply with such requirements could subject us to significant fines and penalties, which may have a
material adverse effect on our business, financial condition or results of operations.
Legislative and regulatory healthcare reform may increase the difficulty and cost for us to obtain marketing approval of and commercialize our
product candidates and affect the prices we may obtain for any products that are approved in the United States or foreign jurisdictions.

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• We depend on collaborations with third parties for the development and commercialization of Auryxia, Riona, Vafseo and vadadustat and if these

collaborations are not successful or if our collaborators terminate their agreements with us, we may not be able to capitalize on the market
potential of Auryxia, Riona, Vafseo and vadadustat, and our business could be materially harmed.

• We may seek to establish additional collaborations and, if we are not able to establish them on commercially reasonable terms, or at all, we may

have to alter our development and commercialization plans.

• We rely upon third parties to conduct all aspects of our product manufacturing, and in many instances only have a single supplier, and the loss of
these manufacturers, their failure to supply us on a timely basis, or at all, or their failure to successfully carry out their contractual duties or
comply with regulatory requirements, cGMP requirements, or guidance could cause delays in or disruptions to our supply chain and substantially
harm our business.

• We rely upon third parties to conduct our clinical trials and certain of our preclinical studies. If they do not successfully carry out their contractual

duties, comply with regulatory requirements or meet expected deadlines, we may not be able to obtain or maintain marketing approval for
Auryxia, vadadustat or any of our product candidates, and our business could be substantially harmed.
If the licensor of certain intellectual property relating to Auryxia terminates, modifies or threatens to terminate existing contracts or relationships
with us, our business may be materially harmed.
If we are unable to adequately protect our intellectual property, third parties may be able to use our intellectual property, which could adversely
affect our ability to compete in the market.

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• We may not be able to protect our intellectual property rights throughout the world.
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The intellectual property that we own or have licensed and related non-patent exclusivity relating to our current and future products is, and may
be, limited, which could adversely affect our ability to compete in the market and adversely affect the value of Auryxia.
The market entry of one or more generic competitors or any third party’s attempt to challenge our intellectual property rights will likely limit
Auryxia sales and have an adverse impact on our business and results of operation.
Litigation and administrative proceedings, including third party claims of intellectual property infringement and opposition/invalidation
proceedings against third party patents, may be costly and time consuming and may delay or harm our drug discovery, development and
commercialization efforts.

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• We may be subject to claims that our employees, consultants or independent contractors have wrongfully used or disclosed confidential

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information of third parties.
If we fail to attract, retain and motivate senior management and qualified personnel, we may be unable to successfully develop, obtain and/or
maintain marketing approval of and commercialize vadadustat or commercialize Auryxia.

• Our cost savings plan and the associated workforce reductions implemented in April, May and November 2022 may not result in anticipated

savings, could result in total costs and expenses that are greater than expected and could disrupt our business.

• We may encounter difficulties in managing our growth, including with respect to our employee base, and managing our operations successfully.
• We are currently subject to legal proceedings that could result in substantial costs and divert management's attention, and we could be subject to

additional legal proceedings.

• Our stock price has been and may continue to be volatile, which could result in substantial losses for holders or future purchasers of our common

stock and lawsuits against us and our officers and directors.

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Item 1. Business

Overview

PART I

We are a fully integrated biopharmaceutical company committed to addressing patients’ unmet needs. Since our initial public offering in 2014, we have
built a business focused on developing and commercializing innovative therapeutics that we believe serves as a foundation for future growth. Our purpose
is to better the life of each person impacted by kidney disease, and we have established ourselves as a leader in the kidney community. We believe our
demonstrated ability to deliver value broadly to the kidney community has enabled us to build a sustainable company. While our current focus centers on
people living with kidney disease, we believe our continued commitment to our products and pipeline assets, focusing on all patients who can realize a
meaningful benefit from our medicines, will result in delivering value for shareholders.

Our current portfolio includes:

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Auryxia® (ferric citrate), a medicine approved and marketed in the United States for two indications: (1) the control of serum phosphorus levels
in adult patients with dialysis dependent chronic kidney disease, or DD-CKD, or the Hyperphosphatemia Indication, and (2) the treatment of iron
deficiency anemia, or IDA, in adult patients with non-dialysis-dependent chronic kidney disease, or NDD-CKD. The product is also available in
Japan and Taiwan.
Vafseo™ (vadadustat), an oral hypoxia-inducible factor prolyl hydroxylase, or HIF-PH, inhibitor, is approved in Japan for the treatment of anemia
due to chronic kidney disease, or CKD, in adult patients. Vadadustat is under regulatory review for the treatment of anemia due to CKD in Europe,
where it has received a positive opinion from the Committee for Medicinal Products for Human Use, or CHMP, of the European Medicines
Agency, or EMA, in adult patients on dialysis. Vadadustat is also under regulatory review for the treatment of anemia due to CKD in Australia,
Korea, Taiwan and other countries. We continue to pursue a path to potentially gain approval for vadadustat in the U.S. Further, we have several
lifecycle management and indication expansion opportunities currently under evaluation or in development for vadadustat.

• HIF-PH inhibitors in preclinical development. The discovery of hypoxia-inducible factor, or HIF, laid the foundation to explore the central role
of oxygen sensing in many diseases. As we have seen through the development of vadadustat as a treatment for anemia due to CKD, when
stabilized, HIF triggers wide-ranging adaptive, protective responses during hypoxic or ischemic conditions. Our clinical team and research
scientists are eager to further develop HIF-PH inhibitors for various indications including acute kidney injury, or AKI, and retinopathy of
prematurity, or ROP.

We continue to explore additional commercial and development opportunities to expand our pipeline and portfolio of novel therapeutics through both
internal research and external innovation to leverage our fully integrated team.

Auryxia

Today we market Auryxia in the United States with our well-established, nephrology-focused commercial organization. Auryxia is a non-calcium, non-
chewable, orally administered tablet that was approved for marketing by the U.S. Food and Drug Administration, or FDA, in September 2014 as a
phosphate binder for the Hyperphosphatemia Indication and was commercially launched in the United States shortly thereafter. In November 2017,
Auryxia received marketing approval from the FDA for a second indication, the treatment of iron deficiency anemia, and was commercially launched for
this indication in the United States shortly thereafter. Our Japanese sublicensee, Japan Tobacco, Inc., or JT, and its subsidiary, Torii Pharmaceutical Co.,
Ltd., or Torii, commercialize ferric citrate hydrate as Riona® in Japan. Averoa SAS, or Averoa, has an exclusive license to develop and commercialize
ferric citrate in the European Economic Area, or EEA, Turkey, Switzerland and the United Kingdom.

In 2022, Auryxia product revenue increased approximately 24.5% over 2021 due to the company’s focus on implementing a new contracting strategy in
late 2021. Since 2018, Auryxia product revenue has grown at a compounded annual growth rate of approximately 17% due to market share gains and
improved net price per pill, despite a 13% decline in total prescriptions for phosphate binders in the United States since 2018.

Vadadustat

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We are seeking regulatory approval in the European Union and the United States for vadadustat as an oral treatment of anemia in adult DD-CKD patients.
We and Mitsubishi Tanabe Pharma Corporation, or MTPC, are also seeking regulatory approval for vadadustat as a treatment for anemia in adult DD-CKD
and NDD-CKD patients in the United Kingdom, Switzerland and Australia, and Korea and Taiwan, respectively.

Vadadustat is currently pending an European Commission, or EC, approval decision. On February 23, 2023, the CHMP of the EMA adopted a positive
opinion recommending the EC approve Vafseo™ for the treatment of symptomatic anemia associated with CKD in adults on chronic maintenance dialysis.
We anticipate that the EC will grant marketing authorization for Vafseo in May 2023, which would be applicable to all 27 European Union member states
and Iceland, Norway and Liechtenstein. Following the termination of our U.S. and international collaboration agreements with Otsuka in June 2022, we
regained full rights to vadadustat in Europe, Australia, China, Canada, Latin America, the Middle East and Russia. As we do not have a commercial
presence in Europe, we are seeking a partner in Europe and will support the partner’s launch of vadadustat, if approved. We are seeking to identify and
secure a partner that can effectively facilitate treatment of as many people as would benefit from vadadustat, if approved, thus maximizing the value of the
asset.

We submitted a New Drug Application, or NDA, to the FDA for vadadustat in March of 2021. On March 29, 2022, the FDA issued a complete response
letter, or CRL, to our NDA for vadadustat. The FDA concluded that the data in the NDA do not support a favorable benefit-risk assessment of vadadustat
for dialysis and non-dialysis patients. The FDA expressed safety concerns noting failure to meet non-inferiority in MACE in the non-dialysis patient
population, the increased risk of thromboembolic events, driven by vascular access thrombosis in dialysis patients, and the risk of drug-induced liver injury.
We believe there are compelling data supporting a positive benefit-risk profile for the use of vadadustat broadly in patients with CKD, including non-
dialysis patients though we have always remained cautious about receiving a broad label for vadadustat that would extend to non-dialysis patients with
anemia due to CKD. As such, we began the process to dispute the FDA ruling, and in October 2022, we submitted a Formal Dispute Resolution Request, or
FDRR, with the FDA regarding the CRL, specifically related to DD-CKD adult patients. The appeal focused on the favorable balance of the benefits and
risks of vadadustat for the treatment of adult DD-CKD patients in light of safety concerns expressed by the FDA in the CRL related to the rate of
adjudicated thromboembolic events driven by vascular access thrombosis for vadadustat compared to the active comparator and the risk of drug-induced
liver injury. In February 2023, we received a second interim response from the FDA to our FDRR, which is still under consideration by the FDA at the time
of this filing.

Following the termination of our collaboration agreement with Otsuka Pharmaceutical Co. Ltd., or Otsuka, we own full rights to vadadustat in the U.S.,
subject to our licensing agreement with Vifor (International) Ltd. (now a part of CSL Limited), or CSL Vifor. If we obtain FDA approval of vadadustat for
DD-CKD adult patients, we plan to commercialize vadadustat in the United States with CSL Vifor.

Leveraging our learnings from the research and development of vadadustat, and a breadth of scientific expertise on the HIF pathway, we believe there is
potential to leverage HIFs to treat other hypoxic conditions and to explore the use of HIFs in acute settings. We believe this potential applies to vadadustat
as well as other preclinical assets we are internally developing.

Regarding broader uses of vadadustat, in July 2020 we partially funded an investigator-sponsored clinical study conducted by The University of Texas
Health Science Center at Houston, or UTHealth, in Houston, Texas, evaluating the use of vadadustat as a potential therapy to prevent and treat acute
respiratory distress syndrome, or ARDS, in adult patients who have been hospitalized due to COVID-19 and hypoxemia (O2 saturation ≤94%). The study
was a phase 2, randomized, double-blind, placebo-controlled trial that measured the proportion of patients who had scores of 6, 7, or 8 on the National
Institute of Allergy and Infectious Disease Ordinal Scale, or NIAID-OS, at Day 7 and Day 14, with Day 14 being the primary endpoint. While the study
missed the primary endpoint, the data, detailed in the Clinical Development Program section, were encouraging. For reference, subjects receiving
vadadustat demonstrated 94% probability for conferring benefit on the NIAID-OS at Day 14, slightly below the primary superiority threshold of >95%
probability. We believe vadadustat has the potential to prevent the worsening of ARDS more broadly since the mechanism underlying the benefits are not
specific to COVID-19, and we will further explore vadadustat in an acute care setting.

Strategy

Our strategic focus and business operations are driven by our commitment to patients. We understand the unmet needs of kidney patients and others
impacted by chronic and debilitating illness. Our strategy is to execute initiatives aligned with our three pillars to maximize value while advancing
innovation to address patients’ unmet needs.

7

• Maximize the Value of Auryxia: We continue to use our nephrology-focused commercial organization to increase awareness, demand for and

adoption of Auryxia for its approved indications with key stakeholders including nephrologists, third-party payors, dialysis organizations and
patients.

•

Support Vadadustat Globally: We believe vadadustat as a treatment for anemia due to CKD represents a significant opportunity to drive
shareholder value. We own full rights to vadadustat in Europe, China, Latin America and certain other territories and U.S. rights subject to our
license agreement with CSL Vifor. We received a positive opinion from the CHMP for vadadustat for adult DD-CKD patients, and anticipate that
the EC will grant marketing authorization for Vafseo in May 2023. In addition, we are engaged with regulatory bodies in the United Kingdom,
Switzerland and Australia, which are part of the ACCESS Consortium, that could lead to approval of vadadustat in these countries. We continue to
pursue a path for potential approval for vadadustat as a treatment for anemia in adult DD-CKD patients in the U.S. and remain actively engaged in
a process to dispute the CRL issued for vadadustat. We believe in the benefits vadadustat can deliver to patients, if approved.

•

Invest in Pipeline and Explore Strategic Growth: We aim to thoughtfully invest in our pipeline by developing internal assets and exploring
other strategic growth opportunities.

◦

◦

◦

Advance vadadustat clinical development for additional therapeutic indications: We intend to advance development of vadadustat for
the treatment of ARDS. We intend to work with UTHealth on an adequate, well-controlled study in a broad patient population, beyond
COVID related ARDS.

Continue to drive our internal pipeline and portfolio of novel therapeutics. We aim to continue to add to our pipeline and portfolio of
novel therapeutics through internal research, discovery and development. We plan to continue to develop early-stage assets and explore
opportunities that align with our strategic vision. As a leader in HIF biology, we have invested resources to build out a preclinical
portfolio of several potential development candidates which may enter the clinic in the next few years. Areas of interest for pursuit of
clinical development include AKI, ARDS and ROP.

Explore opportunities for growth: As a fully integrated biopharmaceutical company, we have an established commercial organization
and expertise in research and development. We believe there may be opportunities to leverage our assets through strategic transactions,
including establishing mutually beneficial relationships with other companies that are looking to advance assets potentially through
regulatory processes or commercial launch.

We strive to execute our strategy from a strong financial position. We plan to continue to invest in prioritized drug research and development activities,
funded by revenue from Auryxia and existing cash on hand. To do so, we are focused on maximizing Auryxia net product revenue, prioritizing the highest
value development opportunities, and aggressively reducing discretionary spending.

Our management team has extensive experience in developing and commercializing innovation medications, a deep understanding of the renal space and
biological pathways involved in kidney disease including HIF biology and iron metabolism, and broad business development expertise. We believe we are
well positioned to execute on our strategy.

Background on Kidney Disease

Kidney disease is an area of major unmet need globally, driving massive healthcare costs and with a generally poor prognosis: eventually many patients
will progress to a stage where they are dependent on dialysis, with high morbidity and a significant increase in mortality rate.

Kidney disease can be caused by a number of distinct and concomitant factors, including cardiometabolic disorders (primarily diabetes and hypertension),
genetic diseases, autoimmune disorders, and aging. Given the prevalence and growth rates of these various underlying conditions, kidney disease
prevalence is expected to continue to increase globally. In the United States, CKD significantly impacts the U.S. healthcare system, potentially affecting
about 37 million patients and costing Medicare nearly $120 billion annually for treating Medicare beneficiaries with CKD of end-stage renal disease, or
ESRD, or end-stage kidney disease, or ESKD, according to the Centers for Disease Control and Prevention. The U.S. Department of Health and Human
Services has recognized this national pandemic and partnered with ASN to found the KidneyX Innovation Accelerator,

8

a public-private partnership to improve the lives of the 850 million people worldwide currently affected by kidney diseases by accelerating innovation in
the prevention, diagnosis and treatment of kidney diseases.

Most of the conditions covered by the term “kidney disease” may lead to renal failure and dependence on dialysis or kidney transplant for survival.
Dependence on dialysis is associated with a significant increase in mortality and hospitalizations, and a significant reduction in quality of life for patients.
There is a clear need to improve the clinical and quality of life outcomes for people living with kidney disease. We are driven by our purpose, to provide or
contribute to better alternatives that improve the lives of people impacted by kidney disease.

CKD is a condition in which the kidneys are progressively damaged to the point that they cannot properly filter the blood circulating in the body. This
damage causes waste products to build up in the patient’s blood leading to other health problems, including anemia, cardiovascular disease and bone
disease.

The prevalence and incidence of CKD is increasing in all segments of the United States population. Risk factors for the development of CKD include
concomitant diseases such as hypertension, diabetes mellitus and cardiovascular disease, lifestyle factors such as tobacco use and inactivity, family history,
aging and prenatal factors such as maternal diabetes mellitus, low birth weight and small-for-gestational-age status. The progression of CKD towards renal
failure is complicated by multiple conditions which further deteriorate kidney function and the general health of patients if left untreated. Typically the
prevalence of these conditions increases as CKD progresses. For instance, patients with CKD often experience high phosphorus and develop
hyperphosphatemia, which can result in symptoms including nausea and muscle or bone pain. Additionally, anemia, characterized by low hemoglobin
levels, is typically associated with a worsening quality of life, increased hospitalizations and increased mortality.

Anemia, or low hemoglobin/red blood count, in patients with CKD most commonly arises from two etiologies:

1. Anemia due to CKD: results from inadequate levels of EPO, a protein hormone synthesized by specialized cells in the kidney that stimulates red

blood cell, or RBC, production in the bone marrow. As renal function declines, the body progressively loses the ability to produce endogenous
EPO; and

2.

IDA: results from low levels of iron due to abnormal iron absorption and utilization in patients with CKD.

Auryxia

Auryxia is a non-calcium, non-chewable, orally-administered tablet marketed in the United States, Japan and Taiwan for the Hyperphosphatemia
Indication, and the treatment of IDA in adult NDD-CKD patients.

Market Opportunity – Hyperphosphatemia and Iron Deficiency Anemia

Hyperphosphatemia is a metabolic disorder characterized by elevated serum phosphorus levels. Phosphorus is a vital element required for most cellular
processes and, in individuals with normal kidney function, excess dietary phosphorus is removed by the kidneys and excreted in urine. In adults with
functioning kidneys, normal serum phosphorus levels are 2.5 to 4.5 mg/dL. In adults with DD-CKD, elevated phosphorus levels, or hyperphosphatemia,
can be associated with adverse effects, including increased risk for cardiovascular disease, bone disease and death.

Phosphate binders are the only interventions marketed for the treatment of hyperphosphatemia. According to the U.S. Renal Data System, or USRDS, 2022
Annual Data Report, there were nearly 558,000 patients in the United States on dialysis in 2020, of which approximately 80% were treated with a
phosphate binder. Phosphate binders need to be taken with meals and snacks, and it is not uncommon for DD-CKD patients to be prescribed as many as 12
or more phosphate binder pills per day, among other medications. Patients taking phosphate binders also experience gastrointestinal tolerability issues. As a
result of the pill burden and tolerability issues associated phosphate binders, prescribed phosphate binders are often intolerable for many patients, leading to
lack of treatment adherence and compliance.

In addition, in 2020 approximately 44% of patients treated with a phosphate binder were treated solely with a calcium-based binder, which can lead to side
effects such as increased cardiovascular risk, hypercalcemia and gastrointestinal-related adverse events. Due to the risks associated with calcium-based
binders, in 2017 Kidney Disease: Improving Global Outcomes, or KDIGO, recommended that clinicians limit the use of calcium-based binders.

Sevelamer and lanthanum-based phosphate binders are other alternatives. Lanthanum is a rare earth element and is minimally absorbed in the
gastrointestinal tract. Lower level tissue deposition, particularly in bone and liver, has been observed in animals, however, the long-term, potentially
harmful, effects due to the accumulation of lanthanum in these tissues have not been clearly

9

determined. Alternatively, sucroferric oxyhydroxide, sold under the brand name Velphoro, is a non-calcium, iron-based phosphate binder that is a chewable
tablet used for the control of serum phosphorus levels.

Aluminum-type phosphate binders were widely used in the past. However, the systemic absorption of aluminum from these agents and the potential
toxicity associated with their use no longer make this type of binder a viable long-term treatment option.

In addition, other agents are in development, including OPKO Health Inc.’s Alpharen™ Tablets (fermagate tablets) and Unicycive’s Renazorb (lanthanum
dioxycarbonate) or could otherwise enter the market, including Ardelyx, Inc.’s tenapanor (which is approved in the United States for the treatment of adults
with irritable bowel syndrome with constipation, and for which the FDA granted an appeal in the fourth quarter of 2022 that will allow Ardelyx to resubmit
a new drug application in 2023 with respect to the control of serum phosphorus in adult patients with CKD on dialysis), that may impact the market for
Auryxia.

Anemia is a condition characterized by abnormally low levels of hemoglobin. Hemoglobin is contained within RBCs and carries oxygen to other parts of
the body. If there are too few RBCs or if hemoglobin levels are low, the cells in the body will not get enough oxygen. IDA is a common form of anemia
that is caused by patients not having enough iron to manufacture healthy RBCs. Although anyone can develop IDA, IDA is particularly common in patients
with NDD-CKD. IDA is associated with fatigue, lethargy, decrease quality of life, cardiovascular complications, hospitalizations and increased mortality.

We estimate that there are more than 500,000 adult patients in the United States with NDD-CKD diagnosed with IDA and managed by a nephrologist.
Currently, there are two forms of iron therapy used to treat IDA: oral iron supplements and iron delivered via intravenous infusion, or IV iron. Oral iron is
currently the first-line iron replacement therapy for most physicians; however, oral iron supplements are poorly absorbed by many patients, which may
adversely impact their effectiveness, and are associated with certain side effects, such as constipation, diarrhea and cramping, that may adversely affect
patient compliance. IV iron is viewed as an effective treatment; however, like other intravenous medicines, it is logistically difficult to administer in an
office setting, where NDD-CKD patients are more often treated.

Commercialization

We market Auryxia in the United States through our well-established, nephrology-focused sales force and commercial organization.

Auryxia, as an oral drug, is covered by Medicare only under Part D. We have gained access for Auryxia in the United States in both Medicare Part D and
commercial channels. Auryxia is currently covered for the Hyperphosphatemia Indication in nine of the ten largest Medicare Part D plans, which provide
coverage for approximately 35.8 million people, and the ten largest commercial plans and pharmacy benefit managers in the United States, which provide
coverage for approximately 131.0 million people. In September 2018, the Centers for Medicare & Medicaid Services, or CMS, decided that Auryxia would
no longer be covered by Medicare for the IDA Indication. While this decision does not impact CMS coverage of the Hyperphosphatemia Indication, it
requires all Auryxia prescriptions for Medicare patients to undergo a prior authorization to ensure their use in the Hyperphosphatemia Indication. While we
believe that the vast majority of the Medicare prescriptions written for Auryxia today are for the Hyperphosphatemia Indication and therefore will continue
to be covered by Medicare with prior authorization, the CMS Decision has had and will continue to have an adverse impact on the sales of Auryxia for the
Hyperphosphatemia Indication and the IDA Indication.

In recognition of the evolution of chronic kidney care to value-based reimbursement and care delivery, in late 2022 we shifted our commercial model to
align to customer objectives. The team of key account managers are focused on high value individual prescribers that represent approximately 70% of
Auryxia prescribing and 40% of the overall binder market potential. The team also focuses on large group practices that are part of the Comprehensive
Kidney Care Contracting, or CKCC. These entities are focused on delivering coordinated, cost-effective care for advanced CKD patients, including those
receiving dialysis. This customer group requires different clinical and economic rationale for supporting product use in protocols and formularies.
Therefore, we have aligned key account managers to these high-volume, value-based care organizations. We believe this model will be more aligned to our
customers’ needs and recognition of our product’s value proposition.

JT, and its subsidiary, Torii, market Riona in Japan. We receive tiered double-digit royalties from JT and Torii based on their sales in Japan.

Vadadustat

10

Market Opportunity

Anemia is common in patients with CKD, and its prevalence increases with disease progression. Anemia due to CKD results from inadequate EPO levels,
which negatively affect RBC production. Left untreated, anemia accelerates overall deterioration of patient health with increased morbidity and mortality.
Based on third party prevalence data and company estimates, approximately 5.7 million people in the United States with CKD suffer from anemia.
According to the USRDS 2022 Annual Data Report, there were nearly 558,000 patients in the United States on dialysis in 2020, of which 86% were on in-
center hemodialysis and the remainder on home dialysis, which includes both peritoneal dialysis and home hemodialysis.

The current standard of care for anemia due to CKD is treatment by injectable recombinant human erythropoiesis-stimulating agents, or ESAs, such as
Epogen® (epoetin alfa), Aranesp® (darbepoetin alfa) and Mircera® (methoxy polyethylene glycol-epoetin beta), or blood transfusion. Based on publicly
available information on ESA sales and market data compiled by a third-party vendor, global sales of injectable ESAs for all uses were estimated to be
approximately $10 billion in 2022. The vast majority of these sales are believed to have been for the treatment of anemia due to CKD. In Europe, within the
EU5, which refers to the five largest markets in Europe or France, Germany, Italy, Spain, and England, more than 200,000 dialysis patients are diagnosed
with anemia due to CKD and are treated with ESAs.

When administered to a patient, injectable ESAs provide supraphysiological levels of exogenous EPO to stimulate production of RBCs. While injectable
ESAs can be effective in raising hemoglobin levels, they have the potential to cause significant side effects, and need to be injected subcutaneously or
intravenously. In particular, injectable ESAs may lead to thrombosis, stroke, myocardial infarction and death. Also, several randomized clinical trials have
demonstrated that higher hemoglobin targets (≥13.0 g/dL) with ESA use are associated with increased cardiovascular risk, leading to changes in regulatory
and clinical practice guidance. While these safety concerns, which became evident starting in 2006, have led to a significant reduction in the use of
injectable ESAs, and an increase in the use of injectable iron, injectable ESAs remain the current standard of care for both DD-CKD and NDD-CKD
patients with anemia.

We believe there is a significant opportunity for vadadustat to address limitations of injectable ESAs and become a new oral option for the treatment of
anemia due to CKD in DD-CKD adult patients, if approved. In addition to clinical data from our Phase 3 INNO VATE program that showed vadadustat
was non-inferior to darbepoetin alfa with respect to hematological efficacy (change in hemoglobin concentration) and cardiovascular safety (MACE) in
DD-CKD adult patients, we believe the potential opportunity for vadadustat within the DD-CKD market is supported by a number of factors including
vadadustat's convenient oral dosing and unique dialysis market dynamics. Further, in February 2023 the FDA approved daprodustat, an oral HIF-PH
inhibitor marketed as Jesduvroq by GlaxoSmithKline plc, or GSK, as a once-a-day treatment of anemia due to CKD in adult patients who have been
receiving dialysis for at least four months.

2

Injectable ESAs are administered by dialysis center staff to approximately 90% of in-center hemodialysis patients and 75% of home dialysis patients.
Although the significant majority of dialysis patients are cared for in-center, recently, several factors including the COVID-19 pandemic, changing patient
preferences, government initiatives, and reimbursement changes are supporting a shift toward home dialysis. We believe as an oral therapeutic, vadadustat
has potential to be a convenient treatment alternative to injectable ESAs not only for in-center dialysis patients, but also for the growing number of home
dialysis patients and patients transitioning to home dialysis.

Given the concentration of dialysis clinics in large networks, with DaVita, Inc., or DaVita, and Fresenius Kidney Care Group accounting for a vast majority
of the dialysis population in the United States, treatment is usually driven by medical protocols that are implemented across the entire network of clinics.
These protocols are informed by very large data sets and when updated, result in rapid change applicable to large segments of the patient population. This is
particularly true of medications covered under the ESRD Prospective Payment System, or PPS, in Medicare, or the ESRD Bundle, a payment structure with
a flat base rate per dialysis session adjusted for individual patient and facility characteristics. Dialysis-related drugs are included in the ESRD Bundle if
they fall into functional categories such as anemia management and bone and mineral metabolism, except that oral-only drugs are exempted from inclusion
until 2025. In a final ESRD PPS rule published in November 2018, CMS confirmed that it will expand the Transitional Drug Add-on Payment Adjustment,
or TDAPA, to all new dialysis drugs approved by the FDA after January 1, 2020. The TDAPA will provide separate payment for new drugs for two years
based on the drug’s Average Sales Price, or ASP, that will be in addition to the base rate in order to facilitate the adoption of innovative therapies. Although
there are several details that need further clarification, and the precise timing of when we could receive codes to allow for reimbursement under TDAPA is
not known, the codes are assigned on a quarterly basis, and the rule provides support for our assumption that new anemia treatments, including those in the
HIF-PH inhibitor class, will be included in the ESRD Bundle and will be eligible for separate payment initially under TDAPA.

Commercialization

11

We are supporting MTPC's commercialization of vadadustat in Japan and are preparing for a potential commercial launch of vadadustat in the United
States, if approved. Our intention is to secure a partner to commercialize vadadustat in the EU and certain other countries.

If we obtain FDA approval of vadadustat for DD-CKD adult patients, we plan to commercialize vadadustat in the United States. In February 2022, we
entered into a Second Amended and Restated License Agreement, or the Vifor Second Amended Agreement, with CSL Vifor. Pursuant to the Vifor Second
Amended Agreement, we granted CSL Vifor an exclusive license to sell vadadustat to Fresenius Medical Care North America and its affiliates, including
Fresenius Kidney Care Group LLC, to certain third-party dialysis organizations approved by us, to independent dialysis organizations that are members of
group purchase organizations, and to certain non-retail specialty pharmacies in the United States, or the Territory. We refer to Fresenius Medical Care North
America and its affiliates, these organizations and specialty pharmacies collectively as the “Supply Group.” During the term of the Vifor Second Amended
Agreement, CSL Vifor is not permitted to sell any HIF product that competes with vadadustat in the Territory to the Supply Group. We plan to
commercialize vadadustat directly with organizations outside the Supply Group.

Clinical Development Program

Below is a summary of the clinical development work undertaken for vadadustat.

Vadadustat Global Phase 3 Clinical Program in Anemia Due To CKD

We conducted a global Phase 3 clinical development program for vadadustat, which included two programs, INNO VATE and PRO TECT. INNO VATE
evaluated vadadustat in adult DD-CKD patients with anemia due to CKD in two studies, and PRO TECT evaluated vadadustat in adult NDD-CKD patients
with anemia due to CKD in two studies. Combined, we enrolled approximately 7,500 patients in these studies and evaluated a once daily oral dosing of
vadadustat against an injectable ESA active comparator, darbepoetin alfa.

2

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2

2

2

2

2

2

Both the INNO VATE and PRO TECT Phase 3 programs were global, multicenter, open-label, sponsor-blind, active-controlled non-inferiority programs. In
both programs, patients were randomized 1:1 to receive either oral vadadustat or injectable darbepoetin alfa. The primary efficacy endpoint for each study
in the INNO VATE and PRO TECT programs was the mean change in hemoglobin between baseline and the primary evaluation period. Non-inferiority, or
NI, for the primary efficacy endpoint was achieved if the lower bound of the 95% confidence interval for the between-group difference of the mean
hemoglobin change did not fall below the pre-specified NI margin. Both the INNO VATE and PRO TECT programs included the primary safety endpoint
of the assessment of MACE, with a comparison of vadadustat to darbepoetin alfa. MACE is defined as the composite endpoint of all-cause mortality, non-
fatal myocardial infarction, or non-fatal stroke. The primary safety analysis for each program was based on the combined MACE events from the two
studies in each of INNO VATE and PRO TECT. NI for the primary safety analysis was achieved if the upper bound of the 95% confidence interval for the
hazard ratio of vadadustat to darbepoetin alfa did not exceed the pre-specified NI margin. We prospectively defined and agreed to non-inferiority margins
with the United States and European regulatory authorities and agreed with the United States regulatory authorities on the key components of our statistical
analysis plan.

2

2

2

2

Top-line Results from Global Phase 3 INNO VATE Program within DD-CKD Adult Patients

2

The two INNO VATE studies (Correction/Conversion and Conversion), which collectively enrolled 3,923 patients, evaluated the efficacy and safety of
vadadustat versus darbepoetin alfa for the treatment of anemia due to CKD in DD-CKD adult patients.

2

Vadadustat achieved the primary and key secondary efficacy endpoint in each of the two INNO VATE studies, demonstrating non-inferiority to darbepoetin
alfa as measured by a mean change in hemoglobin, or Hb, between baseline and the primary evaluation period (weeks 24 to 36) and secondary evaluation
period (weeks 40 to 52). Vadadustat also achieved the primary safety endpoint of the INNO VATE program, defined as non-inferiority of vadadustat versus
darbepoetin alfa in time to first occurrence of MACE across both INNO VATE studies.

2

2

2

Primary and Key Secondary Efficacy Endpoint Results

Vadadustat achieved each of the INNO VATE studies’ primary efficacy endpoints of mean change in Hb between baseline and the primary evaluation
period compared to darbepoetin alfa, in DD-CKD adult patients, demonstrating non-inferiority to darbepoetin alfa based on using a non-inferiority margin
of -0.75 g/dL.

2

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In INNO VATE’s Correction/Conversion study of incident dialysis patients (n=369):

2

•

•

Primary Efficacy Endpoint Result: Vadadustat was non-inferior to darbepoetin alfa. The least square mean difference in Hb was -0.31
g/dL (95% CI: -0.53, -0.10), achieving the pre-specified non-inferiority criterion of -0.75 g/dL. The mean (SD) Hb level at week 24 to
week 36 was 10.36 (1.13) g/dL for vadadustat-treated patients compared to 10.61 (0.94) g/dL for darbepoetin alfa-treated patients.

Key Secondary Efficacy Endpoint Result: Vadadustat sustained the target Hb efficacy response at weeks 40 to 52 achieving non-
inferiority compared to darbepoetin alfa. The least square mean difference in Hb was -0.07 g/dL (95% CI: -0.34, 0.19). The mean (SD)
Hb level at week 40 to week 52 was 10.51 (1.19) g/dL for vadadustat treated-patients compared to 10.55 (1.14) g/dL for darbepoetin alfa-
treated patients.

In INNO VATE’s Conversion study of prevalent dialysis patients (n=3,554):

2

•

•

Primary Efficacy Endpoint Result: Vadadustat was non-inferior to darbepoetin alfa. The least square mean difference in Hb was -0.17
g/dL (95% CI: -0.23, -0.10), achieving the pre-specified non-inferiority criterion of -0.75 g/dL. The mean (SD) Hb level at week 24 to
week 36 was 10.36 (1.01) g/dL for vadadustat-treated patients compared to 10.53 (0.96) g/dL for darbepoetin alfa-treated patients.

Key Secondary Efficacy Endpoint Result: Vadadustat sustained efficacy in the Conversion study demonstrating non-inferiority to
darbepoetin with a least square mean difference in Hb of -0.18 g/dL (95% CI: -0.25, -0.12). The mean (SD) Hb level at week 40 to week
52 was 10.40 (1.04) g/dL in the vadadustat-treated patients compared to 10.58 (0.98) g/dL for darbepoetin treated patients.

Primary Safety Major Adverse Cardiovascular Events (MACE) Endpoint Result

Vadadustat achieved the INNO VATE program’s primary safety endpoint of non-inferiority for MACE. In the primary analysis of time to first MACE
event, vadadustat demonstrated non-inferiority to darbepoetin alfa using a non-inferiority margin of 1.25 based on discussion with the FDA and a non-
inferiority margin of 1.3 based on discussion with the EMA.  

2

The INNO VATE program (Correction/Conversion and Conversion studies) of dialysis patients (n=3,902):

2

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Vadadustat was non-inferior to darbepoetin alfa. The upper bound of the 95% confidence interval (CI) of the Hazard Ratio (HR) was
below the pre-specified non-inferiority margin of 1.25 for primary MACE analysis (HR 0.96, 95% CI: 0.83, 1.11.).

The incidence of treatment emergent adverse events during the Correction/Conversion study in vadadustat treated patients was 83.8% and 85.5 % in
darbepoetin alfa treated patients. During the study, the most common treatment emergent adverse events reported in vadadustat/darbepoetin alfa treated
patients were hypertension (16.2%/ 12.9%) and diarrhea (10.1%/ 9.7%). Serious treatment emergent adverse events were lower in vadadustat treated
patients at 49.7% compared to 56.5% for darbepoetin alfa treated patients. The incidence of treatment emergent adverse events during the Conversion study
in the vadadustat treated patients was 88.3%, and 89.3% in darbepoetin alfa treated patients. During the study, the most common treatment emergent
adverse events reported in vadadustat/darbepoetin alfa treated patients were diarrhea (13.0%/ 10.1%), pneumonia (11.0%/ 9.7%), hypertension (10.6%/
13.8%), and hyperkalemia (9.0%/ 10.8%). Serious treatment emergent adverse events were slightly lower for vadadustat treated patients at 55.0% and
58.3% for darbepoetin alfa-treated patients. Patients with DD-CKD experienced an increased risk of thromboembolic events compared to darbepoetin alfa
with a time to first event HR of 1.20 (95% CI 0.96 - 1.50) driven by thrombosis of vascular access.

INNO VATE results on key secondary safety endpoints showed that vadadustat also demonstrated non-inferiority to darbepoetin alfa in analyses of
expanded MACE, cardiovascular MACE, cardiovascular mortality, and all-cause mortality.

2

Top-line Results from Global Phase 3 PRO TECT Program within NDD-CKD Adult Patients

2

The two PRO TECT studies (Correction and Conversion), which collectively enrolled 3,476 patients, evaluated the efficacy and safety of vadadustat for
the treatment of anemia due to CKD in NDD-CKD adult patients.

2

Vadadustat achieved the primary and key secondary efficacy endpoint in each of the two PRO TECT studies, demonstrating non-inferiority to darbepoetin
alfa as measured by a mean change in Hb between baseline and the primary evaluation period (weeks 24 to 36) and secondary evaluation period (weeks 40
to 52). Vadadustat did not meet the primary safety endpoint of the PRO TECT program, defined as non-inferiority of vadadustat versus darbepoetin alfa in
time to first occurrence of MACE, across both PRO TECT studies.

2

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Primary and Key Secondary Efficacy Endpoint Results

Vadadustat achieved each of the PRO TECT studies' primary efficacy endpoints of mean change in Hb between baseline and the primary evaluation period
compared to darbepoetin alfa, in adult patients on dialysis, demonstrating non-inferiority to darbepoetin alfa using an NI margin of -0.75 g/dL.

2

In PRO TECT's Correction study (n=1,751):

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•

•

Primary Efficacy Endpoint Result: Vadadustat was non-inferior to darbepoetin alfa. The least square mean difference in Hb was 0.05
g/dL (95% CI: -0.04, 0.15), achieving the pre-specified NI criterion of -0.75 g/dL. The mean (SD) Hb level at week 24 to week 36 was
10.39 (0.99) g/dL for vadadustat-treated patients compared to 10.35 (1.03) g/dL for darbepoetin alfa-treated patients.

Key Secondary Efficacy Endpoint Result: Vadadustat sustained the target Hb efficacy response at weeks 40 to 52 achieving non-
inferiority compared to darbepoetin alfa. The least square mean difference in Hb was 0.04 g/dL (95% CI: -0.06, 0.14). The mean (SD) Hb
level at week 40 to week 52 was 10.48 (1.05) g/dL for vadadustat-treated patients compared to 10.45 (1.01) g/dL for darbepoetin alfa-
treated patients.

In PRO TECT's Conversion study (n=1,725):

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•

•

Primary Efficacy Endpoint Result: Vadadustat was non-inferior to darbepoetin alfa. The least square mean difference in Hb was -0.01
g/dL (95% CI: -0.09, 0.07), achieving the pre-specified NI criterion of -0.75 g/dL. The mean (SD) Hb level at week 24 to week 36 was
10.77 (0.98) g/dL for vadadustat-treated patients compared to 10.77 (0.99) g/dL for darbepoetin alfa-treated patients.

Key Secondary Efficacy Endpoint Result: Vadadustat sustained efficacy in the Conversion study demonstrating non-inferiority to
darbepoetin with a least square mean difference in Hb of 0.00 g/dL (95% CI: -0.10, 0.09). The mean (SD) Hb level at week 40 to week 52
was 10.80 (1.04) g/dL in the vadadustat-treated patients compared to 10.79 (1.05) g/dL for darbepoetin alpha-treated patients.

Primary Safety Major Adverse Cardiovascular Events (MACE) Endpoint Result

The PRO TECT program (Correction and Conversion studies) (n=3,471):

2

•

Primary Safety MACE Endpoint Result: Vadadustat did not meet the PRO TECT program's primary safety endpoint of non-inferiority
for MACE. The upper bound of the 95% confidence interval of the Hazard Ratio (HR) was above the pre-specified NI margin of 1.25 for
primary MACE analysis (HR 1.17, 95% CI: 1.01, 1.36).

2

Analysis of MACE events conducted by Akebia in the PRO TECT program revealed that the greater number of MACE events observed among vadadustat
patients as compared to the active comparator was primarily related to an excess of non-cardiovascular death and death-of-unknown-cause in regions
outside of the United States where significant differences in treatment patterns for NDD-CKD patients were observed.

2

2

The PRO TECT analysis plan was prospectively designed to analyze the effect of regional differences, most notably, well-known differences in Hb
treatment targets. Within PRO TECT, U.S. patients were treated to a target Hb range of 10 to 11 g/dL and non-U.S. patients were treated to a target Hb
range of 10 to 12 g/dL. In October of 2020, we presented a pre-specified regional analysis that showed vadadustat was not associated with a clinically
meaningful increase in cardiovascular risk compared to darbepoetin alfa in U.S. patients treated to a target Hb range of 10 to 11 g/dL, in an analysis of
MACE (HR 1.06, 95% CI: 0.87, 1.29).

2

The incidence of treatment emergent adverse events during the Correction study in the vadadustat-treated patients was 90.9%, and 91.6% in darbepoetin
alfa-treated patients. During the study, the most common treatment emergent adverse events reported in vadadustat/darbepoetin alfa-treated patients were
end-stage renal disease (34.7%/ 35.2%), hypertension (17.7%/ 22.1.%), hyperkalemia (12.3.%/ 15.6%), urinary tract infection (12.9%/ 12.0%), diarrhea
(13.9%/ 10.0%), peripheral oedema (12.5%/ 10.5%), fall (9.6%/ 10%) and nausea (10%/ 8.2%). Serious treatment emergent adverse events were 65.3% for
vadadustat-treated patients and 64.5% for darbepoetin alfa-treated patients. The incidence of treatment emergent adverse events during the Conversion
study in vadadustat treated patients was 89.1% and 87.7% in darbepoetin alfa-treated patients. During the study, the most common treatment emergent
adverse events reported in vadadustat/darbepoetin alfa-treated patients were end-stage renal disease (27.5%/ 28.4%), hypertension (14.4%/ 14.8%), urinary
tract infection (12.2%/ 14.5%), diarrhea (13.8.%/ 8.8.%), peripheral oedema (9.9%/ 10.1%) and pneumonia (10.0%/ 9.7%). Serious treatment emergent
adverse events were 58.5% for vadadustat-treated patients and 56.6% for darbepoetin alfa-treated patients.

14

We are also conducting additional studies of vadadustat evaluating a modified approach to once-daily and three-times weekly dosing, including assessment
of a vadadustat starting dose based on an individual’s pre-conversion ESA dose prior to study entry and higher titration doses of vadadustat (up to 1200
mg). We expect to share topline data from these studies at an appropriate medical conference or in a peer-reviewed journal.

Hepatic Safety Profile of Vadadustat in Clinical Studies

During the conduct of our Phase 3 program our team and hepatic experts analyzed hepatic cases (unblinded to treatment) and, following the completion of
our global Phase 3 clinical program for vadadustat, there was a review of hepatic safety across the vadadustat clinical program, which included eight
completed Phase 2 and 3 studies in NDD-CKD patients, 10 completed Phase 1, 2, and 3 studies, and two then-ongoing Phase 3b studies in DD-CKD
patients, and 18 completed studies in healthy subjects (17 Phase 1 and one Phase 3). This review consisted of a blinded re-assessment of hepatic events
conducted by a separate panel of hepatic experts. While hepatocellular injury attributed to vadadustat was reported in less than 1% of patients, there was
one case of severe hepatocellular injury with jaundice, and we cannot guarantee that similar events will not happen in the future. Additionally, the FDA
expressed safety concerns related to the risk of drug-induced liver injury in the CRL that it issued in March 2022.

Acute Respiratory Distress Syndrome

We have supported an investigator-sponsored study evaluating vadadustat for the prevention and treatment of ARDS in clinical trial subjects with COVID-
19 and intend to develop vadadustat for the treatment of ARDS.

Market Opportunity

Acute respiratory distress syndrome, or ARDS, is a life-threatening acute form of lung disease characterized by acute bilateral pulmonary edema, severe
hypoxia. Despite improvement in treatment strategies, a third-party study indicated high hospital mortality rates for patients with ARDS admitted to
participating ICUs. The mortality rate among patients with ARDS was: 34.9% with mild ARDS; 40.3% with moderate ARDS and 46.1% with severe
ARDS.

Clinical Development Program

Vadadustat for the Prevention and Treatment of ARDS in Hospitalized Patients with Coronavirus Disease 2019, or the VSTAT trial, was an investigator-
sponsored clinical trial by UTHealth in Houston, Texas, evaluating the use of vadadustat as a potential therapy to prevent and treat ARDS in adult patients
who have been hospitalized due to COVID-19 and hypoxemia (O2 saturation ≤94%). The VSTAT trial was a randomized, double-blind, placebo-controlled
study, and patients were dosed with vadadustat or a placebo starting within 24 hours of hospital admission and continuing for up to 14 days. In addition to
funds provided by Akebia for the VSTAT trial, UTHealth was awarded $5.1 million in funding from the U.S. Department of Defense, or DOD, to expand
this clinical trial at UTHealth’s facilities.

The VSTAT trial enrolled 449 adult subjects at five hospitals who were randomized 1:1 to vadadustat 900 mg or placebo once per day orally for up to 14
days while hospitalized. The VSTAT trial measured the proportion of subjects with either 6 (non-invasive ventilation or high flow oxygen devices), 7
(invasive mechanical ventilation or extracorporeal membrane oxygenation), or 8 (death) on the NIAID-OS at Day 7 and Day 14 (primary). While a smaller
proportion of subjects in the vadadustat group had a score of 6, 7, or 8 on the NIAID-OS than in the placebo group at Day 14, the trial failed to meet its
primary superiority threshold of >95% probability. Those receiving vadadustat, however, did demonstrate 94% probability of conferring benefit on the
NIAID-OS at Day 14.

At Day 14, the proportions of subjects who had a 6, 7 or 8 on the NIAID-OS were 13.3% (9.6%, 17.7%; 2.5, 97.5 percentiles from Bayesian simulations)
for vadadustat versus 16.9% (12.6%, 22.0%) for placebo with a relative risk of 0.79 and 94% probability that vadadustat was superior to placebo. In a pre-
specified analysis at Day 7, the proportions of subjects who had a 6, 7 or 8 on the NIAID-OS were 25.4% (20.7%, 30.5%) for vadadustat versus 29.7%
(24.5%, 35.3%) for placebo with a relative risk of 0.86 and 97% probability that vadadustat was superior to placebo.

The incidence of treatment emergent adverse events was 78.6% in the vadadustat group and 76.2% in the placebo group. The most common treatment
emergent adverse events reported in vadadustat/placebo subjects were alanine aminotransferase increase (34.4%/28.7%), COVID-19 pneumonia
(19.5%/27.4%), anemia (14.0%/17.0%), aspartate aminotransferase increase (14.0%/14.8%), hyponatremia (10.7%/15.7%), septic shock (11.6%/10.8%),
hyperkalemia (10.2%/10.8%), and hypermagnesemia (7.0%/13.9%). The incidence of serious treatment emergent adverse events was 27.9% in the
vadadustat

15

group and 32.7% in the placebo group. The most common serious treatment emergent adverse events reported in vadadustat/placebo subjects were COVID-
19 pneumonia (19.5%/27.4%) and septic shock (11.6%/10.8%).

While the VSTAT trial missed the primary endpoint, we are encouraged by the data and believe the data supports further development of vadadustat as a
potential treatment for ARDS due to COVID-19 or other causes.

Manufacturing and Supply

Overview
We neither own nor operate, and currently have no plans to own or operate, any manufacturing or distribution facilities. We currently rely on third-party
contract manufacturing organizations, or CMOs, to produce all of our preclinical and clinical material and commercial supply and third-party distributors to
distribute Auryxia. We expect to continue to rely on either existing or alternative distributors and CMOs to distribute our products and supply our ongoing
and planned preclinical studies and clinical trials and for commercial production. Our CMOs have other clients and may have other priorities that could
affect their ability to perform the work satisfactorily and/or on a timely basis. Both of these occurrences would be beyond our control.

We have established relationships with several CMOs under which the CMOs manufacture preclinical, clinical and commercial supply of vadadustat drug
substance and drug product, and clinical and commercial supply of Auryxia drug substance and drug product. All clinical and commercial supplies are
manufactured under current Good Manufacturing Practices, or cGMPs, which is a regulatory standard for the production of pharmaceuticals that will be
used in humans.

Vadadustat
We currently rely on a single source supplier for our drug substance and drug product for preclinical, clinical and commercial supply of vadadustat. We
have entered into a supply agreement with STA Pharmaceutical Hong Kong Limited, or STA, for the manufacture of vadadustat drug substance for
commercial use and for the manufacture of vadadustat drug product for commercial use. We plan to mitigate potential commercial supply risks for
vadadustat, if any, through inventory management and we may enter redundant manufacturing arrangements for both drug substance and drug product if
vadadustat is approved in the United States.

Vadadustat is a small molecule. The synthesis of vadadustat is reliable and reproducible from starting materials available from multiple sources at
commercially relevant scale using no unusual manufacturing equipment. Vadadustat can be formulated into compressed tablets using proprietary processes.
As with any supply program, obtaining raw materials and finished drug product of the required quality and quantity cannot be guaranteed, and we cannot
ensure that we will be successful in this endeavor.

Auryxia
We currently rely on a single source supplier for our drug substance and drug product for preclinical, clinical and commercial supply of Auryxia. We have
established CMO relationships for the supply of Auryxia to help ensure that we will have sufficient material for ongoing commercial sales and clinical
trials. The drug substance for Auryxia is supplied by Siegfried Evionnaz SA, pursuant to a supply agreement, as amended, with pricing structured on a per-
kilogram basis. Auryxia drug product is supplied by Patheon Manufacturing Services LLC (Thermo Fisher) pursuant to a Master Manufacturing Service
Agreement with per-bottle pricing structured on a tiered basis, with the price reduced as the product volume increases. These agreements require that we
satisfy certain minimum purchase requirements, but we are not obligated to use them as our sole suppliers. For more information about our manufacturing
agreements for Auryxia, see Part II, Item 7. Management’s Discussion and Analysis and Note 15 to our consolidated financial statements in Part II, Item 8.
Financial Statements and Supplementary Data.

The active pharmaceutical ingredient of Auryxia, ferric citrate, is a small molecule. The synthesis of ferric citrate is reliable and reproducible from starting
materials available from multiple sources at commercially relevant scale. Ferric citrate can be formulated into compressed tablets using proprietary
manufacturing processes. As with any supply program, obtaining raw materials and finished drug product of the required quality and quantity cannot be
guaranteed, and we cannot ensure that we will be successful in this endeavor.

We utilize third parties for the commercial distribution of Auryxia, including wholesale distributors and certain specialty pharmacy providers. We have also
engaged Cardinal Health as the exclusive third-party logistics distribution agent for commercial sales of Auryxia.

License, Collaboration and Other Strategic Agreements

Vadadustat

U.S. and International Collaboration with Otsuka Pharmaceutical Co. Ltd.

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On December 18, 2016, we entered into a collaboration and license agreement with Otsuka, or the Otsuka U.S. Agreement. The collaboration was focused
on the development and commercialization of vadadustat in the United States. We were responsible for leading the development of vadadustat, for which
we submitted an NDA to the FDA in March 2021, and for which we received the CRL in March 2022. On April 25, 2017, we entered into a collaboration
and license agreement with Otsuka, or the Otsuka International Agreement, pursuant to which we granted Otsuka an exclusive license for the development
and commercialization of vadadustat in certain territory outside the United States. The territory covered by the Otsuka International Agreement included
the European Union, Russia, China, Australia, Canada, the Middle East and certain other countries, or the Otsuka International Territory, but excluded
Latin America and previously licensed jurisdictions.

Under the terms of the Otsuka U.S. Agreement, Otsuka paid us an upfront payment of $125.0 million and additional funding of $353.0 million, based on
the actual costs incurred, toward the vadadustat global Phase 3 development program. Under the terms of the Otsuka International Agreement, Otsuka paid
us $289.9 million, comprised of $73.0 million that was paid upon execution of the Otsuka International Agreement and $216.9 million, based on actual
costs incurred, of development funding.

On May 12, 2022, we received notice from Otsuka that it had elected to terminate the Otsuka U.S. Agreement and the Otsuka International Agreement (as
defined below). On June 30, 2022, we and Otsuka entered into the Termination Agreement (as defined below), pursuant to which, among other things, we
and Otsuka agreed to terminate, as of June 30, 2022, the Otsuka U.S. Agreement and the Otsuka International Agreement. In July 2022, we received a
nonrefundable and non-creditable payment of $55.0 million in consideration for the covenants and agreements set forth in the Termination Agreement,
including the settlement and release of all disputes and claims as provided therein. Also pursuant to the Termination Agreement, Otsuka has transferred the
MAAs for vadadustat with the EMA, and in the United Kingdom, Switzerland and Australia to us.

Collaboration with Mitsubishi Tanabe Pharma Corporation

On December 11, 2015, we entered into a collaboration agreement with MTPC, or the MTPC Agreement, providing MTPC with exclusive development
and commercialization rights to vadadustat in Japan and certain other Asian countries, or the MTPC Territory, which was amended effective as of
December 2, 2022. In addition, we will supply vadadustat to MTPC for both clinical and commercial use in the MTPC Territory, subject to MTPC’s option
to manufacture commercial drug product in the MTPC Territory. On July 15, 2020, we entered into a supply agreement with MTPC for the commercial
supply of vadadustat for use in Japan and certain other Asian countries, as contemplated by the MTPC Agreement, which was amended effective as of
December 5, 2022.

We and MTPC agreed that, instead of including Japanese patients in our global Phase 3 program for vadadustat, MTPC would be the sponsor of a Phase 3
program for vadadustat in Japan. MTPC reported top-line data for the two Phase 3 pivotal trials and data from the two supportive Phase 3 studies in March
2019 and 52-week data for the two Phase 3 pivotal trials in November 2019. In June 2020, vadadustat was approved in Japan for the treatment of anemia
due to CKD by the Ministry of Health, Labor and Welfare. In August 2020, MTPC launched vadadustat commercially in Japan under the trade name,
Vafseo , as a treatment of anemia due to CKD for adult patients on dialysis and not on dialysis. MTPC filed a new drug application for vadadustat for the
treatment of anemia due to CKD in adult patients in Taiwan in January 2022 and in Korea in March 2022.

TM

Unless earlier terminated, the MTPC Agreement will continue in effect on a country-by-country basis until the later of the following: expiration of the last-
to-expire patent covering vadadustat in such country in the MTPC Territory; expiration of marketing or regulatory exclusivity in such country in the MTPC
Territory; or ten years after the first commercial sale of vadadustat in such country in the MTPC Territory. MTPC may terminate the MTPC Agreement
upon twelve months’ notice at any time after the second anniversary of the effective date of the MTPC Agreement. Either party may terminate the MTPC
Agreement upon the material breach of the other party that is not cured within a specified time period or upon the insolvency of the other party.

Under the terms of the MTPC Agreement, MTPC will make payments to us of up to approximately $225.0 million in the aggregate based on the
achievement of certain development, regulatory and sales milestones, as well as tiered royalty payments ranging from 13% to 20% on annual net sales of
vadadustat in the MTPC Territory, subject to reduction upon launch of a generic product on a country-by-country basis. MTPC was responsible for the
costs of the Phase 3 program for vadadustat in Japan and other studies required in Japan and made no funding payments for our global Phase 3 program.
Additionally, the development costs of approximately $20.5 million for our Phase 2 studies in Japan were reimbursed to us by MTPC. In February 2021,
we entered into a royalty interest acquisition agreement with HealthCare Royalty Partners IV, L.P., or HCR, whereby we sold our right to receive royalties
and sales milestones for vadadustat in Japan and certain other Asian countries in the MTPC territory under the MTPC Agreement. For more information on
our royalty interest acquisition agreement with HCR, see Note 6 to our consolidated financial statements in Part II, Item 8. Financial Statements and
Supplementary Data of this Annual Report on Form 10-K.

17

CSL Vifor License Agreement

On February 18, 2022, we entered into the Vifor Second Amended Agreement with CSL Vifor, which amended and restated the Vifor First Amended
Agreement. Pursuant to the Vifor Second Amended Agreement, we granted CSL Vifor an exclusive license to sell vadadustat to the Supply Group in the
Territory. We currently retain rights to commercialize vadadustat for use in the non-dialysis dependent CKD market and to sell to dialysis organizations
outside of the Supply Group. During the term of the Vifor Second Amended Agreement, CSL Vifor is not permitted to sell any HIF product that competes
with vadadustat in the Territory to the Supply Group.

Like the Vifor First Amended Agreement, the Vifor Second Amended Agreement is structured as a profit share arrangement between us and CSL Vifor in
which we will receive approximately 66% of the profit, net of certain pre-specified costs. Under the Vifor First Amended Agreement, CSL Vifor made an
upfront payment to us of $25 million in lieu of the previously disclosed milestone payment of $25 million that CSL Vifor was to pay to us following
approval of vadadustat by the FDA. In addition, CSL Vifor made an equity investment in us, as further described below. We currently retain rights to
commercialize vadadustat for use in the non-dialysis dependent CKD market and to sell to dialysis organizations outside of the Supply Group. As under the
Vifor First Amended Agreement, during the term of the Vifor Second Amended Agreement, CSL Vifor is not permitted to sell any HIF product that
competes with vadadustat in the Territory to the Supply Group.

As under the Vifor First Amended Agreement, the Vifor Second Amended Agreement provides that Akebia and CSL Vifor will enter into a commercial
supply agreement for vadadustat pursuant to which we will supply all of CSL Vifor’s requirements for vadadustat in the Territory. Under the Vifor Second
Amended Agreement, CSL Vifor contributed $40 million to a working capital facility established to partially fund our costs of purchasing vadadustat from
our contract manufacturers, which amount of funding will fluctuate, and which funding we are required to repay to CSL Vifor over time.

Unless earlier terminated, the Vifor Second Amended Agreement will expire upon the later of the expiration of all patents that claim or cover vadadustat or
the expiration of marketing or regulatory exclusivity for vadadustat in the Territory. CSL Vifor may terminate the Vifor Second Amended Agreement in its
entirety upon 30 months’ prior written notice after the first anniversary of the receipt of regulatory approval, if approved, from the FDA for vadadustat for
dialysis-dependent CKD patients. We may terminate the Vifor Second Amended Agreement in its entirety for convenience, following the earlier of a
certain period of time elapsing or following certain specified regulatory events, and upon six months’ prior written notice. If we so terminate for
convenience, subject to a specified exception, we will pay a termination fee to CSL Vifor. In addition, either party may, subject to a cure period, terminate
the Vifor Second Amended Agreement in the event of the other party’s uncured material breach or bankruptcy. We may also terminate the Vifor Second
Amended Agreement upon the occurrence of certain other events. The Vifor Second Amended Agreement also continues to include a standstill provision
and customary representations and warranties.

Also in connection with entering into the Vifor Second Amended Agreement, on February 18, 2022, we and CSL Vifor entered into an Investment
Agreement, or the Investment Agreement, pursuant to which we sold an aggregate of 4,000,000 shares of our common stock to CSL Vifor for a total of
$20.0 million dollars.

Janssen Pharmaceutica NV Research and License Agreement

On February 9, 2017, we entered into a Research and License Agreement, the Janssen Agreement, with Janssen Pharmaceutica NV, or Janssen, a subsidiary
of Johnson & Johnson, pursuant to which Janssen granted us an exclusive license under certain intellectual property rights to develop and commercialize
worldwide certain HIF prolyl hydroxylase targeted compounds.

Under the terms of the Janssen Agreement, we paid an upfront payment of $1.0 million in cash to Janssen and issued a warrant to purchase 509,611 shares
of our common stock, which expired on February 9, 2022. On August 1, 2022, we notified Janssen that we were exercising our right to terminate the
Janssen Agreement in its entirety, and Janssen agreed to the termination which became effective on August 2, 2022.

Cyclerion Therapeutics License Agreement

On June 4, 2021, we entered into the Cyclerion Agreement with Cyclerion Therapeutics, Inc., or Cyclerion, pursuant to which Cyclerion granted us an
exclusive global license under certain intellectual property rights to research, develop and commercialize praliciguat, an investigational oral soluble
guanylate cyclase, or sGC, stimulator.

Under the terms of the Cyclerion Agreement, we made an upfront payment of $3.0 million in cash to Cyclerion, which was paid during the second quarter
of 2021. In addition, Cyclerion is eligible to receive up to an aggregate of $222.0 million from us in specified development and regulatory milestone
payments on a product-by-product basis. Cyclerion will also be eligible to receive specified commercial milestones as well as tiered royalties ranging from
a mid-single-digit to mid-teen percentage of

18

net sales, on a product-by-product basis, and subject to reduction upon expiration of patent rights or the launch of a generic product in the territory. We
recorded the upfront payment in the amount of $3.0 million to research and development expense in June 2021.

Unless earlier terminated, the Cyclerion Agreement will expire on a product-by-product and country-by-country basis upon the expiration of the last
royalty term, which ends upon the longest of (i) the expiration of the patents licensed under the Cyclerion Agreement, (ii) the expiration of regulatory
exclusivity for such product, and (iii) 10 years from first commercial sale of such product. We may terminate the Cyclerion Agreement in its entirety or
only with respect to a particular licensed compound or product upon 180 days' prior written notice to Cyclerion. We and Cyclerion also have customary
termination rights, subject to a cure period, in the event of the other party’s material breach of the Cyclerion Agreement or in the event of certain additional
circumstances.

Auryxia

License Agreement with Panion & BF Biotech, Inc.

Prior to the merger, or the Merger, whereby Keryx Biopharmaceuticals, Inc., or Keryx, became our wholly owned subsidiary, Keryx entered into a license
agreement, or the Panion License Agreement, which was amended from time to time, with Panion & BF Biotech, Inc., or Panion, under which Keryx in-
licensed the exclusive worldwide rights, excluding certain Asian-Pacific countries, or the Licensor Territory, for the development and commercialization of
ferric citrate.

On April 17, 2019, we and Panion entered into a second amended and restated license agreement, or the Panion Amended License Agreement, which
amends and restates in full the Panion License Agreement. The Panion Amended License Agreement provides Keryx with an exclusive license under
Panion-owned know-how and patents covering the rights to sublicense, develop, make, use, sell, offer for sale, import and export ferric citrate worldwide,
excluding the Licensor Territory. The Panion Amended License Agreement also provides Panion with an exclusive license under Keryx-owned patents
covering the rights to sublicense (with our written consent), develop, make, use, sell, offer for sale, import and export ferric citrate in certain countries in
the Licensor Territory. Consistent with the Panion License Agreement, under the Panion Amended License Agreement, Panion is eligible to receive from us
or any sublicensee royalty payments based on a mid-single digit percentage of sales of ferric citrate in our licensed territories. We are eligible to receive
from Panion or any sublicensee royalty payments based on a mid-single digit percentage of net sales of ferric citrate in Panion’s licensed territories.

The Panion Amended License Agreement terminates upon the expiration of each of our and Panion’s obligations to pay royalties thereunder. In addition,
we may terminate the Panion Amended License Agreement (i) in its entirety or (ii) with respect to one or more countries in our licensed territory, in either
case upon 90 days’ notice. We and Panion also each have the right to terminate the Panion Amended License Agreement upon the occurrence of a material
breach of the Panion Amended License Agreement by the other party, subject to certain cure provisions, or certain insolvency events. The Panion Amended
License Agreement also provides that, on a country-by-country basis, during the term and until the second anniversary of the expiration of our or Panion’s
obligation, as applicable, to pay royalties in a country in which such party has ferric citrate for sale on the date of such expiration, neither the other party
nor its affiliates will, directly or indirectly, sell, distribute or otherwise commercialize or supply or cause to supply ferric citrate to a third party for sale or
distribution in such country. In addition, the Panion Amended License Agreement provides that each of us and Panion has the right, but not the obligation,
to conduct litigation against any infringer of certain patent rights under the Panion Amended License Agreement in certain territories.

During the year-ended December 31, 2022, Panion earned $13.8 million in royalty payments relating to the sales of Auryxia in the United States and JT
and Torii net sales of Riona in Japan, as we are required to pay a mid-single digit percent of JT and Torii’s net sales of Riona in Japan to Panion under the
terms of the Panion Amended License Agreement.

Sublicense Agreement with Japan Tobacco Inc. and Torii Pharmaceutical Co., Ltd.

In September 2007, Keryx entered into a Sublicense Agreement with JT and Torii, under which JT and Torii obtained the exclusive sublicense rights for the
development and commercialization of ferric citrate in Japan. Effective June 8, 2009, Keryx entered into an Amended and Restated Sublicense Agreement,
which was amended in June 2013, or the Revised Agreement, with JT and Torii.

In January 2014, JT and Torii received manufacturing and marketing approval of ferric citrate from the Japanese Ministry of Health, Labour and Welfare.
Ferric citrate hydrate, which launched in May 2014 and is being marketed in Japan by Torii under the brand name Riona, is indicated as an oral treatment
for the improvement of hyperphosphatemia in patients with CKD, including NDD-CKD and DD-CKD. In July 2019, JT and Torii, reported positive top-
line results from a pivotal Phase 3 comparative study evaluating Riona for the treatment of IDA in adult patients in Japan, which was approved in March
2021. In May 2020, JT and Torii filed an application for approval of IDA as an additional indication for Riona in Japan. Under the terms

19

of the Revised Agreement with JT and Torii, we are eligible to receive royalty payments based on a tiered low double-digit percentage of net sales of Riona
in Japan inclusive of amounts that we must pay to Panion on JT and Torii’s net sales of Riona under the Panion Amended License Agreement, subject to
certain reductions upon expiration or termination of the Panion Amended License Agreement, and may also receive up to an additional $55.0 million upon
the achievement of certain annual net sales milestones. We recorded $5.3 million in license revenue related to royalties earned on net sales of Riona in
Japan during the twelve months ended December 31, 2022.

The sublicense under the Revised Agreement terminates upon the expiration of all underlying patent rights. Also, JT and Torii may terminate the Revised
Agreement with or without cause upon at least six months prior written notice to us. Additionally, either party may terminate the Revised Agreement for
cause upon 60 days’ prior written notice after the breach of any uncured material provision of the Revised Agreement, or after certain insolvency events.

Intellectual Property

The proprietary nature of, and protection for, our products, product candidates and our discovery programs, processes and know-how are important to our
business. Our policy is to seek to protect our proprietary position by, among other methods, filing patent applications related to our proprietary technology,
inventions and improvements that are important to the development and implementation of our business. We also rely on know-how, continuing
technological innovation and potential in-licensing opportunities to develop and maintain our proprietary position. Additionally, we may benefit from a
variety of statutory frameworks in the United States, Europe and other countries that provide periods of non-patent-based exclusivity for qualifying
molecules. See “—Regulatory Matters.”  

Our commercial success will depend in part on obtaining and maintaining patent protection of our current products as well as current and future product
candidates, methods of their use and the methods used to develop and manufacture them, as well as successfully defending these patents against third-party
challenges. Our ability to stop third parties from making, using, selling, offering to sell or importing our products depends on the extent to which we have
rights under valid and enforceable patents that cover these activities. We cannot be sure that patents will be granted with respect to any of our pending
patent applications or with respect to any patent applications filed by us in the future, nor can we be sure that any of our existing patents or any patents that
may be granted to us in the future will be commercially useful in protecting our product candidates, discovery programs and processes. Even once patents
successfully issue, third parties may challenge the validity, enforceability, inventorship, or scope thereof, which may result in such patents being narrowed,
invalidated or held not infringed or unenforceable. For this and more comprehensive risks related to our intellectual property, please see “Risk Factors—
Risks Related to Our Intellectual Property” in Part I, Item 1A. Risk Factors.

Individual patents extend for varying periods of time depending on the date of filing of the patent application or the date of patent issuance and the legal
term of patents in the countries in which they are obtained. Generally, patents issued from applications filed in the United States are effective for 20 years
from the earliest filing date of a United States non-provisional application or an international application filed under the Patent Cooperation Treaty. In
addition, in certain instances, a patent term can be extended to recapture a portion of the term effectively lost as a result of the FDA regulatory review
period, however, the restoration period cannot be longer than five years and the total patent term including the restoration period must not exceed 14 years
following FDA approval. The duration of foreign patents varies in accordance with provisions of applicable local law, but typically is also 20 years from
the earliest international filing date. Patent term recapture for loss of term as a result of the regulatory review period is available in some foreign
jurisdictions. In the United States, a patent’s term may also be lengthened by patent term adjustment, which compensates a patentee for administrative
delays by the United States Patent and Trademark Office, or USPTO, in granting a patent, or may be shortened if a patent is terminally disclaimed over an
earlier‑filed patent.

Changes in either the patent laws or interpretations of patent laws in the United States and other countries can diminish our ability to protect our inventions
and enforce our intellectual property rights. Accordingly, we cannot predict the breadth or enforceability of claims that may be granted in our patents or in
third-party patents. The biotechnology and pharmaceutical industries are characterized by extensive litigation regarding patents and other intellectual
property rights. Our ability to maintain and solidify our proprietary position for our drugs and technology will depend on our success in obtaining effective
claims and enforcing those claims once granted. We do not know whether any of the patent applications that we may file or license from third parties will
result in the issuance of any patents. The issued patents that we own or license or may receive or acquire in the future may be challenged, invalidated or
circumvented, and the rights granted under any issued patents may not provide us with sufficient protection or competitive advantages against competitors
with similar technology. Furthermore, our competitors may be able to independently develop and commercialize similar drugs or duplicate our technology,
business model or strategy without infringing our patents. Because of the extensive time required for clinical development and regulatory review of a drug
we may develop, it is possible that, before any of our drugs can be commercialized, any related patent may

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expire or remain in force for only a short period following commercialization, thereby reducing any advantage of any such patent. The patent positions for
vadadustat and Auryxia are summarized below.

Vadadustat Patent Portfolio

We hold 12 issued patents covering the composition of matter, polymorph, method of treating anemia, pharmaceutical compositions of vadadustat, and
processes for manufacturing vadadustat in the United States and additional patents issued or pending in many other major jurisdictions worldwide,
including Europe, Japan, China, South Korea, Brazil, Mexico, Russia, Israel and India. The expected expiration dates for these patents are between 2027
and 2034 plus any extensions or adjustments of term available under national law.

We also hold patents and patent applications directed to starting materials and intermediates in the processes for manufacturing vadadustat, dosing
regimens, formulations, and various other aspects relating to the treatment of anemia using vadadustat that are expected to expire between 2032 and 2042
exclusive of possible patent term extensions or adjustments.

We have ongoing opposition and invalidity proceedings relating to vadadustat. See Part I, Item 3. Legal Proceedings for further information relating
to these matters.

Auryxia Patent Portfolio

Pursuant to Keryx’s license with Panion, we have the exclusive rights under a series of patents and patent applications to commercialize Auryxia
worldwide, excluding certain Asian-Pacific countries. These patents and patent applications include claims directed to compositions of matter,
pharmaceutical compositions, methods of treatment, as well as methods for the manufacture of Auryxia.

Keryx’s patent rights include 14 issued U.S. patents listed in the Orange Book covering the composition of matter, method of treating hyperphosphatemia,
and pharmaceutical compositions of Auryxia. The expected expiration dates for these patents are between 2024 and 2030 plus any additional patent term
extensions that may be available.  

Pursuant to the sublicense with our Japanese partner, Japan Tobacco Inc., or JT, and its subsidiary, Torii Pharmaceutical Co. Ltd., or Torii, we have
exclusively sublicensed certain Japanese patent rights to JT and Torii. These sublicensed rights include several Japanese patents and pending patent
applications with composition of matter claims, methods of synthesizing claims, and methods of use claims covering Riona, the trade name under which JT
and Torii market ferric citrate in Japan. The expected expiration dates for these patents and pending patent applications are between 2025 and 2027. To
date, to our knowledge, no contested proceedings or third-party claims have been lodged against any of these Japanese patents.

Pursuant to the sublicense with our European partner, Averoa, we have exclusively sublicensed certain European patent rights to Averoa. These sublicensed
rights include several European patents and pending patent applications with composition of matter claims and methods of use claims covering ferric
citrate. The expected expiration dates for these patents and pending patent applications are between 2024 and 2036. To date, to our knowledge, no
contested proceedings or third-party claims have been lodged against any of these European patents.

We received Paragraph IV certification notice letters regarding ANDAs submitted to the FDA by third parties requesting approval for generic versions of
Auryxia tablets (210 mg ferric iron per tablet). In response we filed certain complaints for patent infringement against five third parties, and have entered
into settlement and license agreements with each of the five ANDA filers. Each settlement agreement granted the defendants a license to market a generic
version of Auryxia in the United States beginning on March 20, 2025 (subject to FDA approval), or earlier under certain circumstances customary for
settlement agreements of this nature.

Other Intellectual Property Rights

We depend upon trademarks, trade secrets, know-how and continuing technological advances to develop and maintain our competitive position. To
maintain the confidentiality of trade secrets and proprietary information, we require our employees, scientific advisors, consultants and collaborators, upon
commencement of a relationship with us, to execute confidentiality agreements and, in the case of parties other than our research and development
collaborators, to agree to assign their inventions to us. These agreements are designed to protect our proprietary information and to grant us ownership of
technologies that are developed in connection with their relationship with us. These agreements may not, however, provide protection for our trade secrets
in the event of unauthorized disclosure of such information.

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In addition to patent protection, we may utilize orphan drug regulations, pediatric exclusivity or other provisions of the Food, Drug and Cosmetic Act of
1938, as amended, or FDCA, such as new chemical entity exclusivity or new formulation exclusivity, to provide market exclusivity for a drug candidate. In
the United States, the FDA has the authority to grant additional data protection for approved drugs where the sponsor conducts specified testing in pediatric
or adolescent populations. If granted, this pediatric exclusivity may provide an additional six months which are added to the term of data protection as well
as to the term of a relevant patent, to the extent these protections have not already expired. We may also seek to utilize market exclusivities in other
territories. We cannot assure you that our drug products or any drug candidates we may acquire or in-license, will obtain such orphan drug designation,
pediatric exclusivity, new chemical entity exclusivity or any other market exclusivity in the United States, European Union or any other territory, or that we
will be the first to receive the respective regulatory approval for such drugs so as to be eligible for any market exclusivity protection.

Know-How

In addition to patents, we rely upon unpatented know-how and continuing technological innovation to develop and maintain our competitive position. We
seek to protect our proprietary information, in part, using confidentiality agreements with our collaborators, employees and consultants and invention
assignment provisions in the confidentiality agreements with our employees. These agreements are designed to protect our proprietary information and, in
the case of the invention assignment provisions, to grant us ownership of technologies that are developed by our employees. These agreements may be
breached, and we may not have adequate remedies for any breach.

To the extent that our commercial partners, collaborators, employees and consultants use intellectual property owned by others in their work for us,
disputes may arise as to the rights in related or resulting know-how and inventions.

The Hatch-Waxman Act

Orange Book Listing

In seeking approval for a drug through an NDA, sponsors are required to list with the FDA each patent whose claims cover the sponsor’s product. Upon
approval of a drug, each of the patents listed in the application for the drug is then published in the FDA’s Approved Drug Products with Therapeutic
Equivalence Evaluations, commonly known as the Orange Book. Drugs listed in the Orange Book can, in turn, be cited by potential generic competitors in
support of approval of an ANDA. An ANDA provides for marketing of a drug product that has the same active ingredients in the same strengths and
dosage form as the listed drug and has been shown through bioequivalence testing to be therapeutically equivalent to the listed drug. Other than the
requirement for bioequivalence testing, ANDA sponsors are usually not required to conduct, or submit results of, nonclinical or clinical tests to prove the
safety or effectiveness of their drug product. Drugs approved in this way are commonly referred to as “generic equivalents” to the listed drug and can often
be substituted by pharmacists under prescriptions written for the original listed drug.

The ANDA sponsor is required to make certain certifications to the FDA concerning any patents listed for the approved product in the FDA’s Orange Book.
Specifically, the sponsor must certify that: (i) the required patent information has not been filed; (ii) the listed patent has expired; (iii) the listed patent has
not expired but will expire on a particular date and approval is sought after patent expiration; or (iv) the listed patent is invalid or will not be infringed by
the new product. The ANDA sponsor may also elect to submit a Section viii statement, certifying that its proposed ANDA label does not contain or carve
out any language regarding the patented method-of-use, rather than certify to a listed method-of-use patent.

If the sponsor does not challenge the listed patents, the ANDA will not be approved until all the listed patents claiming the referenced product have
expired. A certification that the new product will not infringe the already approved product’s listed patents, or that such patents are invalid, is called a
Paragraph IV certification. If the ANDA sponsor has provided a Paragraph IV certification to the FDA, the sponsor must also send notice of the Paragraph
IV certification to the NDA and patent holders once the ANDA has been accepted for filing by the FDA. The NDA and patent holders may then initiate a
patent infringement lawsuit in response to the notice of the Paragraph IV certification. The filing of a patent infringement lawsuit within 45 days of the
receipt of a Paragraph IV certification automatically prevents the FDA from approving the ANDA until the earlier of 30 months from receiving the
Paragraph IV certification, expiration of the patent, settlement of the lawsuit, or a decision in the infringement case that is favorable to the ANDA sponsor.
Also, the ANDA will not be approved until any applicable non-patent exclusivity listed in the Orange Book for the referenced product has expired.

Exclusivity

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Upon NDA approval of a new chemical entity, or NCE, which is a drug that contains an active moiety that has not been approved by the FDA in any other
NDA, that drug receives five years of marketing exclusivity during which time the FDA cannot accept any ANDA seeking approval of a generic version of
that drug. Certain changes to a drug, such as the addition of a new indication to the package insert, are associated with a three-year period of exclusivity
during which the FDA cannot approve an ANDA for a generic drug that includes such changes.

An ANDA may be submitted one year before NCE exclusivity expires if a Paragraph IV certification is filed. If there is no listed patent in the Orange
Book, there may not be a Paragraph IV certification, and, thus, no ANDA may be filed before the expiration of the exclusivity period.

Patent Term Extension

After NDA approval, owners of relevant drug patents or their agents may apply for up to a five-year patent extension for delays caused by FDA regulatory
review. The allowable patent term extension is calculated as half of the drug’s testing phase which is the time between Investigational New Drug
application, or IND submission and NDA submission, and all of the review phase, which is the time between NDA submission and approval, up to a
maximum of five years. The time can be shortened if the FDA determines that the sponsor did not pursue approval with due diligence. The total patent term
after the extension may not exceed 14 years from the date of approval by virtue of the patent term extension.

We have filed applications under the patent term extension provisions of 35 U.S.C. § 156 for U.S. Patent Nos. 8,299,298, 8,093,423, 7,767,851 and
8,338,642 each of which covers Auryxia for delays caused by FDA regulatory review. If granted, we can utilize the patent term extension on one of these
patents, however, we cannot assure you that we can obtain any extension of the term of these patents. Upon expiration of these patents, competitors who
obtain the requisite regulatory approval may potentially offer products with the same composition and/or method of use as our product, so long as the
competitors do not infringe any other patents that we may own or license.

For patents that might expire before a determination regarding patent term extension, the patent owner or its agent may request an interim patent term
extension. An interim patent extension increases the patent term by one year and may be renewed up to four times. For each interim patent extension
granted, the post-approval patent extension is reduced by one year. The director of the USPTO must determine that approval of the drug covered by the
patent for which a patent extension is being sought is likely.

In addition, certain jurisdictions outside of the U.S., including Japan, have provisions that provide for patent term extension. In October 2014, following the
regulatory approval of Riona in Japan, the Japan Patent office granted the patent term extensions filed by our sublicensee, JT, for Japanese Patents Nos.
4964585 and 4173553. As a result of the extension of patent term, Japanese Patent No. 4173553 expired in November 2022 and Japanese Patent No.
4964585 will expire in November 2025.  

In the future, if and when our product candidates, including vadadustat, receive approval by the FDA or foreign regulatory authorities, we expect to apply
for patent term extensions on issued patents covering those drugs, depending upon the length of the clinical trials for each product candidate and other
factors. There can be no assurance that any of our pending patent applications will issue or that we will benefit from any patent term extension or favorable
adjustment to the term of any of our patents.

Competition

The pharmaceutical and biotechnology industries are highly competitive. Our competitors include pharmaceutical companies and biotechnology
companies, as well as universities and public and private research institutions. In addition, companies that are active in different but related fields represent
substantial competition for us. Many of our competitors have significantly greater capital resources, larger research and development staffs and facilities
and greater experience in drug development, regulation, manufacturing and marketing than we do. These organizations also compete with us to recruit
qualified personnel, attract partners for joint ventures or other collaborations, and license technologies that are competitive with ours. To compete
successfully in this industry, we must identify novel and unique drugs or methods of treatment and then complete the development of those drugs as
treatments in advance of our competitors.

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Vadadustat

Drugs that may compete with vadadustat, if approved, include Epogen® (epoetin alfa) and Aranesp® (darbepoetin alfa), both commercialized by Amgen,
Procrit® (epoetin alfa) and Eprex® (epoetin alfa), commercialized by Johnson & Johnson in the United States and Europe, respectively, and Mircera®
(methoxy PEG-epoetin beta), commercialized by CSL Vifor in the United States and Roche Holding Ltd. outside of the United States.

In addition, in the United States, the FDA approved Jesduvroq (daprodustat), an oral HIF-PHI from GSK for the once-a-day treatment of anemia due to
CKD in adults who have been receiving dialysis for at least four months. FibroGen filed an NDA for its product candidate, roxadustat, with the FDA, but
the FDA issued a complete response letter indicating the FDA will not approve the NDA in its present form. In Europe however, roxadustat is approved for
the treatment of anemia in patients with CKD.

We and our partners may also face competition from potential new anemia therapies. There are several other HIF-PH inhibitor product candidates in
various stages of development for anemia indications that may be in direct competition with vadadustat if and when they are approved and launched
commercially. These candidates are being developed by companies such as FibroGen Inc., or FibroGen, together with its collaboration partners, Astellas
Pharma Inc. and AstraZeneca PLC, JT, GSK, and Bayer HealthCare AG, or Bayer.

Furthermore, certain companies are developing potential new therapies for renal-related diseases that could potentially reduce injectable ESA utilization
and thus limit the market potential for vadadustat if they are approved and launched commercially. Other new therapies are in development for the
treatment of conditions inclusive of renal anemia that may impact the market for anemia-targeted treatment.

In Japan, Vafseo, which is approved for patients with CKD, including both DD-CKD and NDD-CKD, competes with roxadustat, daprodustat and
enarodustat. Roxadustat is approved for the treatment of anemia due to CKD, including DD-CKD and NDD-CKD patients. In addition, daprodustat, GSK’s
product candidate, and enarodustat, JT’s product candidate, are approved in Japan for the treatment of anemia due to CKD. In addition, Bayer HealthCare
AG has submitted a new drug application for its product candidate for the treatment of renal anemia in Japan. In China, FibroGen launched roxadustat for
the treatment of anemia due to CKD in DD-CKD patients and for the treatment of anemia due to CKD in NDD-CKD patients.

A biosimilar is a biologic product that is approved based on demonstrating that it is highly similar to an existing, FDA-approved branded biologic product.
The patents for the existing, branded biologic product must expire in a given market before biosimilars may enter that market without risk of being sued for
patent infringement. In addition, an application for a biosimilar product cannot be approved by the FDA until 12 years after the existing, branded product
was approved under a Biologics License Application, or BLA. The patents for epoetin alfa, an injectable ESA, expired in 2004 in the EU, and the
remaining patents expired between 2012 and 2016 in the United States. Because injectable ESAs are biologic products, the introduction of biosimilars into
the injectable ESA market in the United States will constitute additional competition for vadadustat if we are able to obtain approval for and commercially
launch vadadustat. In the United States, Pfizer’s biosimilar version of injectable ESAs, Retacrit® (epoetin alfa-epbx), was approved by the FDA in May
2018 and launched in November 2018 and several biosimilar versions of injectable ESAs are available for sale in the EU.

Furthermore, vadadustat’s commercial opportunities, if approved, may be reduced or eliminated if our competitors develop and market products that are
less expensive, more effective, safer or offer greater patient convenience than vadadustat.

Auryxia

Hyperphosphatemia Competition

Auryxia is competing in the hyperphosphatemia market in the United States with other FDA-approved phosphate binders such as Renagel® (sevelamer
hydrochloride) and Renvela® (sevelamer carbonate), both marketed by Sanofi, PhosLo® and Phoslyra® (calcium acetate), marketed by Fresenius Medical
Care North America, Fosrenol® (lanthanum carbonate), marketed by Shire Pharmaceuticals Group plc, and Velphoro® (sucroferric oxyhydroxide),
marketed by Fresenius Medical Care North America, as well as over-the-counter calcium carbonate products such as TUMS® and metal-based options
such as aluminum, lanthanum and magnesium. Most of the phosphate binders listed above are now also available in generic forms. In addition, other agents
are in development, including OPKO Health Inc.’s Alpharen™ Tablets (fermagate tablets) and Unicycive’s RENAZORB™ (lanthanum dioxycarbonate) or
could otherwise enter the market, including Ardelyx, Inc.’s tenapanor (which is approved in the U.S. for the treatment of adults with irritable bowel
syndrome with constipation, and which the FDA granted

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Ardelyx’s appeal to the FDA’s CRL in December 2022 that will allow Ardelyx to resubmit a new drug application in 2023 with respect to the control of
serum phosphorus in adult patients with CKD on dialysis), that may impact the market for Auryxia.

Iron Deficiency Anemia Competition

Auryxia is competing in the IDA market in the United States with over-the-counter oral iron, ferrous sulfate, other prescription oral iron formulations,
including ferrous gluconate, ferrous fumerate, and polysaccharide iron complex, and intravenous iron formulations, including Feraheme® (ferumoxytol
injection), Venofer® (iron sucrose injection), Ferrlicit® (sodium ferric gluconate complex in sucrose injection), Injectafer® (ferric carboxymaltose
injection), and Triferic® (ferric pyrophosphate citrate). In addition, other new therapies for the treatment of IDA may impact the market for Auryxia, such
as Shield Therapeutic’ plc's Feraccru® (ferric maltol), which is available in Europe for the treatment of IDA, and Accrufer® (ferric maltol), which was
launched in the United States for the treatment of IDA in July 2021.

Furthermore, Auryxia’s commercial opportunities may be reduced or eliminated if our competitors develop and market products that are less expensive,
more effective, safer or offer greater patient convenience than Auryxia. Other companies have product candidates in various stages of preclinical or clinical
development to treat diseases and complications of the diseases for which we are marketing Auryxia. In addition, we entered into settlement agreements
with each of our ANDA filers pursuant to which we granted licenses to market a generic version of Auryxia in the United States beginning in March 2025
(subject to FDA approval), or earlier under certain circumstances customary for settlement agreements of this nature, which may impact our business and
results of operation.

Government Regulation and Product Approvals

Government authorities in the United States, at the federal, state and local level, and in other countries and jurisdictions, including the European Union,
extensively regulate, among other things, the research, development, testing, manufacture, quality control, approval, packaging, storage, recordkeeping,
labeling, advertising, promotion, distribution, marketing, sales, pricing, reimbursement, post-approval monitoring and reporting, and import and export of
pharmaceutical products. The processes for obtaining regulatory approvals in the United States and in foreign countries and jurisdictions, along with
subsequent compliance with applicable statutes and regulations and other regulatory requirements, require the expenditure of substantial time and financial
resources.

Review and Approval of Drug Products in the United States

In the United States, the FDA approves and regulates drugs under the Federal Food, Drug, and Cosmetic Act, or FDCA, and implementing regulations.

Our product candidates must be approved by the FDA for therapeutic indications before we or our partners are able to market them in the United States. A
company, institution, or organization which takes responsibility for the initiation and management of a clinical development program for such products is
referred to as a sponsor. A sponsor seeking approval to market and distribute a new drug product in the United States must typically undertake the
following:

•

•

•

•

•

•

•

completion of preclinical laboratory tests, animal studies and formulation studies in compliance with the FDA’s good laboratory practice,
or GLP, regulations and consistent with International Council for Harmonisation of Technical Requirements for Pharmaceuticals for
Human Use, or ICH, requirements;

design of a clinical protocol and submission to the FDA of an IND, which must be reviewed and active by the FDA before human clinical
trials may begin;

approval by an independent local or central institutional review board, or IRB, representing each clinical site before each clinical trial
may be initiated;

performance of adequate and well-controlled human clinical trials in accordance with good clinical practices, or GCP, to establish the
safety and efficacy of the proposed product candidate for each indication;

preparation and submission to the FDA of an NDA requesting marketing for one or more proposed indications;

review of the product candidate by an FDA advisory committee, where appropriate or if applicable;

satisfactory completion of one or more FDA inspections of the manufacturing facility or facilities at which the product candidate, or
components thereof, are produced to assess compliance with current Good Manufacturing Practices, or cGMP, requirements and to assure
that the facilities, methods and controls are adequate to preserve the product candidate’s identity, strength, quality and purity;

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•

•

•

Preclinical Tests

satisfactory completion of FDA audits of clinical trial sites and records to assure compliance with GCPs and good practices, or GxPs, the
integrity of the clinical data and that adequate controls and oversight are in place regarding manufacturing, clinical trials,
pharmacovigilance, safety, data management, vendor oversight, collection and reporting of serious adverse events and other activities;

payment of user fees and securing FDA approval of an NDA; and

compliance with any post-approval requirements and/or commitments, including the potential requirement to implement a risk evaluation
and mitigation strategy, or REMS, and potentially post-market requirement, or PMR, and post-market commitment, or PMC, studies.

Before a sponsor begins testing a product candidate with potential therapeutic value in humans, the product candidate enters the preclinical testing stage.
Preclinical tests include laboratory evaluations of product chemistry, formulation and stability, as well as other studies to evaluate, among other things, the
toxicity of the product candidate. The conduct of the preclinical tests and formulation of the compounds for testing must comply with federal regulations
and requirements, including GLP regulations and standards and the United States Department of Agriculture’s Animal Welfare Act, if applicable. The
results of the preclinical tests, together with manufacturing information and analytical data, are submitted to the FDA as part of an IND and are generally
referred to as IND-enabling studies. Some long-term preclinical testing, such as animal tests of reproductive adverse events and carcinogenicity, and long-
term toxicity studies, may continue after the IND is submitted.

The IND and IRB Processes

Clinical trials involve the administration of the investigational product to human patients under the supervision of qualified investigators in accordance
with GCP requirements, which include, among other things, the requirement that all research patients provide their voluntary informed consent in writing
before their participation in any clinical trial. Clinical trials are conducted under written study protocols detailing, among other things, the inclusion and
exclusion criteria, the objectives of the study, the parameters to be used in monitoring safety and the effectiveness criteria to be evaluated. A protocol for
each clinical trial and any subsequent protocol amendments must be submitted to the FDA as part of the IND.

An IND is an exemption from the FDCA that allows an unapproved drug to be shipped through interstate commerce for use in an investigational clinical
trial and a request for FDA authorization to administer an investigational drug to humans. Such authorization must be obtained prior to interstate shipment
and administration of any new drug that is not the subject of an approved NDA. The results of the preclinical tests, together with manufacturing
information, analytical data, any available clinical data or literature and plans for clinical trials, among other things, are submitted to the FDA as part of an
IND. The FDA requires a 30-day waiting period after the submission of each IND before clinical trials may begin. This waiting period is designed to allow
the FDA to review the IND to determine whether human research patients will be exposed to unreasonable health risks. At any time during this 30-day
period, or thereafter, the FDA may raise concerns or questions about the conduct of the trials as outlined in the IND and impose a clinical hold or partial
clinical hold or require that the sponsor amend the clinical protocol to include additional safety measurements. In this case, the IND sponsor and the FDA
must resolve any outstanding concerns before clinical trials can begin (or resume if the clinical trial had been ongoing at the time a clinical hold was
imposed).

In addition to the foregoing requirements related to the IND submission, an IRB representing each institution participating in the clinical trial must review
and approve the plan for any clinical trial before it commences at that institution, and the IRB must conduct a continuing review and reapprove the trial at
least annually. The IRB must review and approve, among other things, the trial protocol and informed consent information to be provided to study patients.
An IRB must operate in compliance with FDA regulations. An IRB can suspend or terminate approval of a clinical trial at its institution, or an institution it
represents, if the clinical trial is not being conducted in accordance with the IRB’s requirements or if the product candidate has been associated with
unexpected serious harm to patients.

A sponsor may choose, but is not required, to conduct a foreign clinical study under an IND. When a foreign clinical study is conducted under an IND, all
IND requirements must be met unless waived by the FDA. When a foreign clinical study is not conducted under an IND, the sponsor must ensure that the
study complies with certain regulatory requirements of the FDA in order to use the study as support for an IND or application for marketing approval.
Specifically, the studies must be conducted in accordance with GCP, including undergoing review and receiving approval by an independent ethics
committee and seeking and receiving informed consent from subjects. GCP requirements encompass both ethical and data integrity standards for clinical
trials. The FDA’s regulations are intended to help ensure the protection of human subjects enrolled in non-IND foreign clinical trials, as well as the quality
and integrity of the resulting data.

Reporting Clinical Trial Results

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Under the Public Health Service Act, or PHSA, sponsors of certain clinical trials of certain FDA-regulated products, including prescription drugs and
biologics, are required to register and disclose certain clinical trial information on a public registry (clinicaltrials.gov) maintained by the U.S. National
Institutes of Health, or NIH. In particular, information related to the product, patient population, phase of investigation, study sites and investigators and
other aspects of the clinical trial is made public as part of the registration of the clinical trial. Although sponsors are also obligated to disclose the results of
their clinical trials after completion, disclosure of the results can be delayed in some cases for up to two years after the date of completion of the trial. The
NIH’s Final Rule on registration and reporting requirements for clinical trials became effective in 2017, and both NIH and the FDA have signaled the
government’s willingness to begin enforcing those requirements against non-compliant clinical trial sponsors.

Specifically, the PHSA grants the Secretary of the U.S. Department of Health and Human Services, or HHS, the authority to issue a notice of
noncompliance to a responsible party for failure to submit clinical trial information as required. The responsible party, however, is allowed 30 days to
correct the noncompliance and submit the required information. The failure to submit clinical trial information to clinicaltrials.gov, as required, is also a
prohibited act under the FDCA with violations subject to potential civil monetary penalties of up to $10,000 for each day the violation continues. In
addition to civil monetary penalties, violations may also result in other regulatory action, such as injunction and/or criminal prosecution or disqualification
from federal grants. Although the FDA has historically not enforced these reporting requirements due to HHS’s long delay in issuing final implementing
regulations, those regulations have now been issued and the FDA has issued several Notices of Noncompliance to manufacturers since April 2021.

Expanded Access to an Investigational Drug for Treatment Use

Expanded access, sometimes called “compassionate use,” is the use of investigational new drug products outside of clinical trials to treat patients with
serious or immediately life-threatening diseases or conditions when there are no comparable or satisfactory alternative treatment options. The rules and
regulations related to expanded access are intended to improve access to investigational drugs for patients who may benefit from investigational therapies.
FDA regulations allow access to investigational drugs under an IND by the company or the treating physician for treatment purposes on a case-by-case
basis for: individual patients (single-patient IND applications for treatment in emergency settings and non-emergency settings); intermediate-size patient
populations; and larger populations for use of the drug under a treatment protocol or Treatment IND Application.

There is no obligation for a sponsor to make its investigational products available for expanded access; however, as required by amendments to the FDCA
included in the 21st Century Cures Act passed in 2016, if a sponsor has a policy regarding how it responds to expanded access requests with respect to
product candidates in development to treat serious diseases or conditions, it must make that policy publicly available. Sponsors are required to make such
policies publicly available upon the earlier of initiation of a Phase 2 or Phase 3 study for a covered investigational product; or 15 days after the
investigational product receives designation from the FDA as a breakthrough therapy, fast track product, or regenerative medicine advanced therapy.

On May 30, 2018, the Right to Try Act was signed into law. The law, among other things, provides a federal framework for certain patients to access
certain investigational new drug products that have completed a Phase I clinical trial and that are undergoing investigation for FDA approval. Under certain
circumstances, eligible patients can seek treatment without enrolling in clinical trials and without obtaining FDA permission under the FDA expanded
access program. There is no obligation for a drug manufacturer to make its product candidates available to eligible patients as a result of the Right to Try
Act, but the manufacturer must develop an internal policy and respond to patient requests according to that policy.

Human Clinical Trials in Support of an NDA

Clinical trials involve the administration of the investigational product to human patients under the supervision of qualified investigators in accordance
with GCP requirements, which include, among other things, the requirement that all research patients provide their informed consent in writing before their
participation in any clinical trial. Clinical trials are conducted under written study protocols detailing, among other things, the inclusion and exclusion
criteria, the objectives of the study, the parameters to be used in monitoring safety and the effectiveness criteria to be evaluated.

Human clinical trials are typically conducted in four sequential phases, which may overlap or be combined:

•

Phase 1. The product candidate is initially introduced into a small number of healthy human patients or, in certain indications such as
cancer, patients with the target disease or condition (e.g., cancer) and tested for

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safety, dosage tolerance, absorption, metabolism, distribution, excretion and, if possible, to gain an early indication of its effectiveness
and to determine optimal dosage.

Phase 2. The product candidate is administered to a limited patient population to identify possible adverse effects and safety risks, to
preliminarily evaluate the efficacy of the product candidate for specific targeted diseases and to determine dosage tolerance and optimal
dosage.

Phase 3. These clinical trials are commonly referred to as “pivotal” studies, which denote a study that presents the data that the FDA or
other relevant regulatory agency will use to determine whether or not to approve a product candidate. The product candidate is
administered to an expanded patient population, generally at geographically dispersed clinical trial sites, in well-controlled clinical trials
to generate enough data to statistically evaluate the efficacy and safety of the product candidate for approval, identify adverse effects,
establish the overall risk-benefit profile of the product candidate and to provide adequate information for the labeling of the product
candidate.

Phase 4. Post-approval studies may be conducted after initial marketing approval. These studies are used to gain additional experience
from the treatment of patients in the intended therapeutic indication.

•

•

•

A clinical trial may combine the elements of more than one phase and the FDA often requires more than one Phase 3 trial to support marketing approval of
a product candidate. A company’s designation of a clinical trial as being of a particular phase is not necessarily indicative that the study will be sufficient to
satisfy the FDA requirements of that phase because this determination cannot be made until the protocol and data have been submitted to and reviewed by
the FDA. Moreover, as noted above, a pivotal trial is a clinical trial that is believed to satisfy FDA requirements for the evaluation of a product candidate’s
safety and efficacy such that it can be used, alone or with other pivotal or non-pivotal trials, to support regulatory approval. Generally, pivotal trials are
Phase 3 trials, but they may be Phase 2 trials if the design provides a well-controlled and reliable assessment of clinical benefit, particularly in an area of
unmet medical need.

In December 2022, with the passage of Food and Drug Omnibus Reform Act, or FDORA, Congress required sponsors to develop and submit a diversity
action plan for each phase 3 clinical trial or any other “pivotal study” of a new drug or biological product. These plans are meant to encourage the
enrollment of more diverse patient populations in late-stage clinical trials of FDA-regulated products. Specifically, actions plans must include the sponsor’s
goals for enrollment, the underlying rationale for those goals, and an explanation of how the sponsor intends to meet them. In addition to these
requirements, the legislation directs the FDA to issue new guidance on diversity action plans. Progress reports detailing the results of the clinical trials
conducted under the IND must be submitted at least annually to the FDA and, more frequently, if serious adverse events occur. In addition, IND safety
reports must be submitted to the FDA for any of the following: serious and unexpected suspected adverse reactions; findings from other studies or animal
or in vitro testing that suggest a significant risk in humans exposed to the drug; and any clinically important increase in the case of a serious suspected
adverse reaction over that listed in the protocol or investigator brochure. The FDA, IRB or the sponsor or the data monitoring committee may suspend or
terminate a clinical trial at any time on various grounds, including a finding that the research patients are being exposed to an unacceptable health risk. The
FDA will typically inspect one or more clinical sites to assure compliance with GCP and the integrity of the clinical data submitted.

In response to the COVID-19 pandemic, the FDA issued guidance on March 18, 2020, and has updated it periodically since that time to address the
conduct of clinical trials during the pandemic. The guidance sets out a number of considerations for sponsors of clinical trials impacted by the pandemic,
including the requirement to include in the clinical study report (or as a separate document) contingency measures implemented to manage the study, and
any disruption of the study as a result of COVID-19. On January 30, 2023, the Biden Administration announced that it will end the public health
emergency declarations related to COVID-19 on May 11, 2023. On January 31, 2023, the FDA indicated that it would soon issue a Federal Register notice
describing how the termination of the public health emergency will impact the agency’s COVID-19 related guidance, including the clinical trial guidance
and updates thereto. At this point, it is unclear how, if at all, these developments will impact our efforts to develop and commercialize our product
candidates.

Pediatric Studies

Under the Pediatric Research Equity Act, or PREA, applications and certain types of supplements to applications must contain data that are adequate to
assess the safety and effectiveness of the product for the claimed indications in all relevant pediatric subpopulations, and to support dosing and
administration for each pediatric subpopulation for which the product is safe and effective. The sponsor must submit an initial Pediatric Study Plan, or PSP,
within 60 days of an end-of-phase 2 meeting or as may be agreed between the sponsor and the FDA. Those plans must contain an outline of the proposed
pediatric study or studies the sponsor plans to conduct, including study objectives and design, age groups, relevant endpoints and statistical approach, or a
justification for not including such detailed information, and any request for a deferral of pediatric assessments or a full or partial waiver of the requirement
to provide data from pediatric studies along with supporting information. The sponsor and the

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FDA must reach agreement on a final plan. A sponsor can submit amendments to an agreed-upon initial PSP at any time if changes to the pediatric plan
need to be considered based on data collected from nonclinical trials, early phase clinical trials, and/or other clinical development programs.

For investigational products intended to treat a serious or life-threatening disease or condition, the FDA must, upon the request of a sponsor, meet to
discuss preparation of the initial pediatric study plan or to discuss deferral or waiver of pediatric assessments. In addition, the FDA will meet early in the
development process to discuss pediatric study plans with sponsors, and the FDA must meet with sponsors by no later than the end-of-phase 1 meeting for
serious or life-threatening diseases and by no later than ninety days after the FDA’s receipt of the study plan.

The FDA may, on its own initiative or at the request of the sponsor, grant deferrals for submission of some or all pediatric data until after approval of the
product for use in adults, or full or partial waivers from the pediatric data requirements. A deferral may be granted for several reasons, including a finding
that the product or therapeutic candidate is ready for approval for use in adults before pediatric trials are complete or that additional safety or effectiveness
data needs to be collected before the pediatric trials begin. Pursuant to the Food and Drug Administration Safety and Innovation Act of 2012, or FDASIA,
the FDA must send a PREA Non-Compliance letter to sponsors who have failed to submit their pediatric assessments required under PREA, have failed to
seek or obtain a deferral or deferral extension or have failed to request approval for a required pediatric formulation. FDASIA further requires the FDA to
publicly post the PREA Non-Compliance letter and sponsor’s response. Unless otherwise required by regulation, the pediatric data requirements do not
apply to products with orphan designation, although FDA has recently taken steps to limit what it considers abuse of this statutory exemption in PREA by
announcing that it does not intend to grant any additional orphan drug designations for rare pediatric subpopulations of what is otherwise a common
disease. The FDA also maintains a list of diseases that are exempt from PREA requirements due to low prevalence of disease in the pediatric population.

Acceptance and Review of an NDA

Assuming successful completion of required clinical testing and other requirements, the results of the preclinical studies and clinical trials, together with
detailed information relating to the product’s chemistry, manufacture, controls and proposed labeling, among other things are submitted to the FDA as part
of an NDA requesting approval to market the product candidate for one or more indications. The fee required for the submission and review of an
application under the Prescription Drug User Fee Act, or PDUFA, is substantial (for example, for fiscal year 2023 this application fee is approximately $3.2
million), and the sponsor of an approved application is also subject to an annual program fee, currently more than $393,000 per eligible prescription
product. These fees are typically adjusted annually, and exemptions and waivers may be available under certain circumstances, such as where a waiver is
necessary to protect the public health, where the fee would present a significant barrier to innovation, or where the sponsor is a small business submitting
its first human therapeutic application for review.

The FDA conducts a preliminary review of all applications within 60 days of receipt and must inform the sponsor at that time or before whether an
application is sufficiently complete to permit substantive review. This is known as the filing decision. In the event that FDA determines that an application
does not satisfy this standard, it will issue a Refuse to File determination to the sponsor. The FDA may request additional information rather than accept an
NDA for filing. In this event, the application must be resubmitted with the additional information. The resubmitted application is also subject to review
before the FDA accepts it for filing. Once the submission is accepted for filing, the FDA begins an in-depth substantive review. The FDA has agreed to
certain performance goals in the review process of NDAs. Most such applications are meant to be reviewed within ten months from the date of filing, and
most applications for “priority review” products are meant to be reviewed within six months of filing. A product that has been designated as a breakthrough
therapy may also be eligible for review within six months if supported by clinical data at the time of submission of the NDA. The review process may be
extended by the FDA for three additional months to consider new information or clarification provided by the sponsor to address an outstanding deficiency
identified by the FDA following the original submission.

Before approving an NDA, the FDA typically will inspect the facility or facilities where the product is or will be manufactured. These pre-approval
inspections may cover all facilities associated with an NDA submission, including drug component manufacturing such as active pharmaceutical
ingredients, finished drug product manufacturing, control testing laboratories, as well as packaging and labeling facilities. The FDA will not approve an
application unless it determines that the manufacturing processes and facilities are in compliance with cGMP requirements and adequate to assure
consistent production of the product within required specifications. The PREVENT Pandemics Act, which was enacted in December 2022, clarifies that
foreign drug manufacturing establishments are subject to registration and listing requirements even if a drug or biologic undergoes further manufacture,
preparation, propagation, compounding, or processing at a separate establishment outside the United States prior to being imported or offered for import
into the United States.

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Additionally, before approving an NDA, the FDA will typically inspect one or more clinical sites to assure compliance with GCP. The sponsor of the NDA
may also have their records, processes, procedures, training, and other aspects reviewed during an inspection. The FDA must implement a protocol to
expedite review of responses to inspection reports pertaining to certain drug applications, including applications for drugs in a shortage or drugs for which
approval is dependent on remediation of conditions identified in the inspection report.

In addition, as a condition of approval, the FDA may require a sponsor to develop a REMS. REMS use risk minimization strategies beyond the professional
labeling to ensure that the benefits of the product outweigh the potential risks.

Finally, the FDA may refer an application for a novel drug to an advisory committee or explain why such referral was not made. Typically, an advisory
committee is a panel of independent experts, including clinicians and other scientific experts, that reviews, evaluates and provides a recommendation as to
whether the application should be approved and under what conditions. The FDA is not bound by the recommendations of an advisory committee, but it
considers such recommendations carefully when making decisions.

Fast Track, Breakthrough Therapy, Priority Review

The FDA is authorized to designate certain products for expedited review if they are intended to address an unmet medical need in the treatment of a
serious or life-threatening disease or condition. These programs are referred to as fast track designation, breakthrough therapy designation, priority review
designation.

Specifically, the FDA may designate a product for fast track review if it is intended, whether alone or in combination with one or more other drugs, for the
treatment of a serious or life-threatening disease or condition, and it demonstrates the potential to address unmet medical needs for such a disease or
condition. The fast track designation may be withdrawn by the FDA if the FDA believes that the designation is no longer supported by data emerging in the
clinical trial process.

Second, in 2012, Congress enacted the Food and Drug Administration Safety and Improvement Act. This law established a new regulatory scheme
allowing for expedited review of products designated as “breakthrough therapies.” A product may be designated as a breakthrough therapy if it is intended,
either alone or in combination with one or more other drugs, to treat a serious or life-threatening disease or condition and preliminary clinical evidence
indicates that the product may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints, such as
substantial treatment effects observed early in clinical development. The FDA may take certain actions with respect to breakthrough therapies, including
holding meetings with the sponsor throughout the development process; providing timely advice to the product sponsor regarding development and
approval; involving more senior staff in the review process; assigning a cross-disciplinary project lead for the review team; and taking other steps to design
the clinical trials in an efficient manner.  

Third, the FDA may designate a product for priority review if it is a drug that treats a serious condition and, if approved, would provide a significant
improvement in safety or effectiveness. The FDA determines, on a case-by-case basis, whether the proposed drug represents a significant improvement
when compared with other available therapies. A priority designation is intended to direct overall attention and resources to the evaluation of such
applications, and to shorten the FDA’s review clock goal for taking action on a marketing application from ten months to six months.

Priority Review Vouchers

A PRV is a voucher that the FDA issues to a sponsor of a rare pediatric disease or tropical disease product application at the time of the marketing
application approval. Vouchers are transferable to other sponsors that may apply it to their NDAs or BLAs. A PRV entitles the holder to designate a single
human drug application submitted under Section 505(b)(1) of the U.S. Federal Food, Drug, and Cosmetic Act or Section 351 of the Public Health Service
Act as qualifying for a priority review. An FDA priority review may expedite the review process of a marketing application reducing the review time from
ten months after formal acceptance of the file to six months after formal acceptance of the file. Applying the PRV to a marketing application does not
ensure the FDA’s approval of the marketing application and all requirements supporting the safety and efficacy of the product must be met. Our NDA
submission for vadadustat did not include a PRV.

The FDA’s Decision on an NDA

The FDA reviews an application to determine, among other things, whether the product is safe and whether it is effective for its intended use(s), with the
latter determination being made on the basis of substantial evidence. The term “substantial evidence” is defined under the FDCA as “evidence consisting of
adequate and well-controlled investigations, including clinical

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investigations, by experts qualified by scientific training and experience to evaluate the effectiveness of the product involved, on the basis of which it could
fairly and responsibly be concluded by such experts that the product will have the effect it purports or is represented to have under the conditions of use
prescribed, recommended, or suggested in the labeling or proposed labeling thereof.”

The FDA has interpreted this evidentiary standard to require at least two adequate and well-controlled clinical investigations to establish effectiveness of a
new product. Under certain circumstances, however, FDA has indicated that a single trial with certain characteristics and additional information may satisfy
this standard. This approach was subsequently endorsed by Congress in 1998 with legislation providing, in pertinent part, that “If [FDA] determines, based
on relevant science, that data from one adequate and well-controlled clinical investigation and confirmatory evidence (obtained prior to or after such
investigation) are sufficient to establish effectiveness, FDA may consider such data and evidence to constitute substantial evidence.” This modification to
the law recognized the potential for FDA to find that one adequate and well controlled clinical investigation with confirmatory evidence, including
supportive data outside of a controlled trial, is sufficient to establish effectiveness. In December 2019, FDA issued draft guidance further explaining the
studies that are needed to establish substantial evidence of effectiveness. It has not yet finalized that guidance.

After evaluating the application and all related information, including the advisory committee recommendations, if any, and inspection reports of
manufacturing facilities and clinical trial sites, the FDA will issue either a CRL or an approval letter. To reach this determination, the FDA must determine
that the drug is effective and that its expected benefits outweigh its potential risks to patients. This “benefit-risk” assessment is informed by the extensive
body of evidence about the product’s safety and efficacy in the NDA or BLA. This assessment is also informed by other factors, including: the severity of
the underlying condition and how well patients’ medical needs are addressed by currently available therapies; uncertainty about how the premarket clinical
trial evidence will extrapolate to real-world use of the product in the post-market setting; and whether risk management tools are necessary to manage
specific risks. In connection with this assessment, the FDA review team will assemble all individual reviews and other documents into an “action package,”
which becomes the record for FDA review. The review team then issues a recommendation, and a senior FDA official makes a decision.

A CRL indicates that the review cycle of the application is complete, and the application will not be approved in its present form. A CRL generally outlines
the deficiencies in the submission and may require substantial additional testing or information in order for the FDA to reconsider the application. The CRL
may require additional clinical or other data, additional pivotal Phase 3 clinical trial(s) and/or other significant and time- consuming requirements related to
clinical trials, preclinical studies or manufacturing. If a CRL is issued, the sponsor will have one year to respond to the deficiencies identified by the FDA,
at which time the FDA can deem the application withdrawn or, in its discretion, grant the sponsor an additional six month extension to respond. The FDA
has committed to reviewing resubmissions in response to an issued CRL in either two or six months depending on the type of information included. Even
with the submission of this additional information, however, the FDA ultimately may decide that the application does not satisfy the regulatory criteria for
approval. The FDA has taken the position that a CRL is not final agency action making the determination subject to judicial review. Rather, for those
seeking to challenge FDA’s CRL decision, the agency has indicated that sponsors may request a formal hearing on the CRL or they may file a request for
reconsideration or a request for a formal dispute resolution.

An approval letter, on the other hand, authorizes commercial marketing of the product with specific prescribing information for specific indications. That
is, the approval will be limited to the conditions of use (e.g., patient population, indication) described in the FDA-approved labeling. Further, depending on
the specific risk(s) to be addressed, the FDA may require that contraindications, warnings or precautions be included in the product labeling, require that
post-approval trials, including Phase 4 clinical trials, be conducted to further assess a product’s safety after approval, require testing and surveillance
programs to monitor the product after commercialization or impose other conditions, including distribution and use restrictions or other risk management
mechanisms under a REMS which can materially affect the potential market and profitability of the product. The FDA may prevent or limit further
marketing of a product based on the results of post-marketing trials or surveillance programs. After approval, some types of changes to the approved
product, such as adding new indications, manufacturing changes and additional labeling claims, are subject to further testing requirements and FDA review
and approval.

Under the Ensuring Innovation Act, which was signed into law in April 2021, the FDA must publish action packages summarizing its decisions to approve
new drugs and biologics within 30 days of approval of such products. To date, CRLs are not publicly available documents.

Post-Approval Requirements and Commitments

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If a product receives regulatory approval, the approval may be significantly limited to specific diseases and dosages or the indications for use may
otherwise be limited, which could restrict the commercial value of the product. Further, the FDA may require that certain contraindications, warnings or
precautions be included in the product labeling. In addition, conditions of NDA approval may include sponsor agreement to PMR or PMC studies, which
are designed to further assess drug safety and effectiveness and may require testing and surveillance programs to monitor the safety of approved products
that have been commercialized. These may include additional studies, registries, data collection, analyses, and/or information.

Drugs manufactured or distributed pursuant to FDA approvals are subject to pervasive and continuing regulation by the FDA, including, among other
things, requirements relating to recordkeeping, periodic reporting, product sampling and distribution, advertising and promotion and reporting of adverse
experiences with the product. After approval, most changes to the approved product, such as adding new indications or other labeling claims, are subject to
prior FDA review and approval. There also are continuing, annual user fee requirements for any marketed products and the establishments at which such
products are manufactured, as well as new application fees for supplemental applications with clinical data.

In addition, drug manufacturers and other entities involved in the manufacture and distribution of approved drugs are required to register their
establishments with the FDA and state agencies and are subject to periodic unannounced inspections by the FDA and these state agencies for compliance
with cGMP requirements. Changes to the manufacturing process are strictly regulated and often require prior FDA approval before being implemented.
FDA regulations also require investigation and correction of any deviations from cGMP and impose reporting and documentation requirements upon the
sponsor and any third-party manufacturers that the sponsor may decide to use. Accordingly, manufacturers must continue to expend time, money, and effort
in the area of production and quality control to maintain cGMP compliance.

Once an approval is granted, the FDA may withdraw the approval if compliance with regulatory requirements and standards is not maintained or if
problems occur after the product reaches the market. Later discovery of previously unknown problems with a product, including adverse events of
unanticipated severity or frequency, or with manufacturing processes, or failure to comply with regulatory requirements, may result in revisions to the
approved labeling to add new safety information; imposition of post-market studies or clinical trials to assess new safety risks; or imposition of distribution
or other restrictions under a REMS program. Other potential consequences include, among other things:

•

•

•

•

•

restrictions on the marketing or manufacturing of the product, suspension of the approval, or complete withdrawal of the product from the
market or product recalls;

fines, warning letters or holds on post-approval clinical trials;

refusal of the FDA to approve pending NDAs or supplements to approved NDAs, or suspension or revocation of product license
approvals;

product seizure or detention, or refusal to permit the import or export of products; or

injunctions or the imposition of civil or criminal penalties.

The FDA strictly regulates the marketing, labeling, advertising and promotion of prescription drug products placed on the market. This regulation includes,
among other things, standards and regulations for direct-to-consumer advertising, communications regarding unapproved uses, industry-sponsored
scientific and educational activities, and promotional activities involving the Internet and social media. Promotional claims about a product candidate’s
safety or effectiveness are prohibited before the product candidate is approved. After approval, a drug product generally may not be promoted for uses that
are not approved by the FDA or in a manner that is inconsistent with the product’s prescribing information. In September 2021, the FDA published final
regulations which describe the types of evidence that the agency will consider in determining the intended use of a drug product.

In the United States, healthcare professionals are generally permitted to prescribe drugs for such uses not described in the drug’s labeling, known as off-
label uses, because the FDA does not regulate the practice of medicine. However, FDA regulations impose rigorous restrictions on manufacturers’
communications, prohibiting the promotion of off-label uses. It may be permissible, under very specific conditions, for a manufacturer to engage in
nonpromotional, truthful and non-misleading communication regarding off-label information, such as distributing scientific or medical journal information.
In addition, companies may also promote information that it consistent with the prescribing information and have the ability to proactively speak to
formulary committee members of payors regarding data for an unapproved drug or unapproved uses of an approved drug under some relatively recent
guidance from the FDA. Moreover, with passage of the Pre-Approval Information Exchange Act, or PIE Act, in December 2022, sponsors of products that
have not been approved may proactively communicate to payors certain information about products in development to help expedite patient access upon
product approval. Previously, such communications were permitted under FDA guidance but the new legislation explicitly provides protection to sponsors
who convey certain information about products in development to payors, including unapproved uses of approved products. 

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However, if a company is found to have promoted off-label uses, it may become subject to adverse public relations and administrative and judicial
enforcement by the FDA, the Department of Justice, or the Office of the Inspector General of the Department of Health and Human Services, as well as
state authorities. This could subject a company to a range of penalties that could have a significant commercial impact, including civil and criminal fines
and agreements that materially restrict the manner in which a company promotes or distributes drug products. The federal government has levied large civil
and criminal fines against companies for alleged improper promotion and has also requested that companies enter into consent decrees or permanent
injunctions under which specified promotional conduct is changed or curtailed.

In addition, the distribution of prescription pharmaceutical products is subject to a variety of federal and state laws, the most recent of which is still in the
process of being phased into the U.S. supply chain and regulatory framework. The Prescription Drug Marketing Act, or PDMA, was the first federal law to
set minimum standards for the registration and regulation of drug distributors by the states and to regulate the distribution of drug samples. Today, both the
PDMA and state laws limit the distribution of prescription pharmaceutical product samples and impose requirements to ensure accountability in
distribution. Congress more recently enacted the Drug Supply Chain Security Act, or DSCSA, which made significant amendments to the FDCA, including
by replacing certain provisions from the PDMA pertaining to wholesale distribution of prescription drugs with a more comprehensive statutory scheme.
The DSCSA now requires uniform national standards for wholesale distribution and, for the first time, for third-party logistics providers; it also provides
for preemption of certain state laws in the areas of licensure and prescription drug traceability.

Section 505(b)(2) NDAs

NDAs for most new drug products are based on two full clinical trials which must contain substantial evidence of the safety and efficacy of the proposed
new product for the proposed use. These applications are submitted under Section 505(b)(1) of the FDCA. The FDA is, however, authorized to approve an
alternative type of NDA under Section 505(b)(2) of the FDCA. This type of application allows the sponsor to rely, in part, on the FDA’s previous findings
of safety and efficacy for a similar product, or published literature. Specifically, Section 505(b)(2) applies to NDAs for a drug for which the investigations
made to show whether or not the drug is safe for use and effective in use and relied upon by the sponsor for approval of the application “were not
conducted by or for the sponsor and for which the sponsor has not obtained a right of reference or use from the person by or for whom the investigations
were conducted.”

Section 505(b)(2) authorizes the FDA to approve an NDA based on safety and effectiveness data that were not developed by the sponsor. NDAs filed under
Section 505(b)(2) may provide an alternate and potentially more expeditious pathway to FDA approval for new or improved formulations or new uses of
previously approved products. If the 505(b)(2) sponsor can establish that reliance on the FDA’s previous approval is scientifically appropriate, the sponsor
may eliminate the need to conduct certain preclinical studies or clinical trials of the new product. The FDA may also require companies to perform
additional studies or measurements to support the change from the approved product. The FDA may then approve the new drug candidate for all or some of
the label indications for which the referenced product has been approved, as well as for any new indication sought by the Section 505(b)(2) sponsor.
Products approved under Section 505(b)(2) are often referred to as follow-on products.

Abbreviated New Drug Applications for Generic Drugs

In 1984, with passage of the Hatch-Waxman Amendments to the FDCA, Congress established an abbreviated regulatory scheme authorizing the FDA to
approve generic drugs that are shown to contain the same active ingredients as, and to be bioequivalent to, drugs previously approved by the FDA pursuant
to NDAs. To obtain approval of a generic drug, a sponsor must submit an abbreviated new drug application, or ANDA, to the agency. An ANDA is a
comprehensive submission that contains, among other things, data and information pertaining to the active pharmaceutical ingredient, bioequivalence, drug
product formulation, specifications and stability of the generic drug, as well as analytical methods, manufacturing process validation data and quality
control procedures. ANDAs are “abbreviated” because they generally do not include preclinical and clinical data to demonstrate safety and effectiveness.
Instead, in support of such applications, a generic manufacturer may rely on the preclinical and clinical testing previously conducted for a drug product
previously approved under an NDA, known as the reference-listed drug, or RLD.

Under the Hatch-Waxman Act, the FDA may not approve an ANDA or 505(b)(2) application until any applicable period of non-patent exclusivity for the
RLD has expired. The FDCA provides a period of five years of non-patent data exclusivity for a new drug containing a NCE. For the purposes of this
provision, the FDA has consistently taken the position that an NCE is a drug that contains no active moiety that has previously been approved by the FDA
in any other NDA. This interpretation was confirmed with enactment of the Ensuring Innovation Act in April 2021. An active moiety is the molecule or ion
responsible for the physiological or pharmacological action of the drug substance. In cases where such NCE exclusivity has been granted, a

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generic or follow-on drug application may not be filed with the FDA until the expiration of five years unless the submission is accompanied by a Paragraph
IV certification, in which case the sponsor may submit its application four years following the original product approval.

The FDCA also provides for a period of three years of exclusivity if the NDA includes reports of one or more new clinical investigations, other than
bioavailability or bioequivalence studies, that were conducted by or for the sponsor and are essential to the approval of the application. This three-year
exclusivity period often protects changes to a previously approved drug product, such as a new dosage form, route of administration, combination or
indication. Three-year exclusivity would be available for a drug product that contains a previously approved active moiety, provided the statutory
requirement for a new clinical investigation is satisfied. Unlike five-year NCE exclusivity, an award of three-year exclusivity does not block the FDA from
accepting ANDAs or 505(b)(2) applications seeking approval for generic versions of the drug as of the date of approval of the original drug product. The
FDA typically makes decisions about awards of data exclusivity shortly before a product is approved.

The FDA must establish a priority review track for certain generic drugs, requiring the FDA to review a drug application within eight months for a drug
that has three or fewer approved drugs listed in the Orange Book and is no longer protected by any patent or regulatory exclusivities, or is on the FDA’s
drug shortage list. The new legislation also authorizes FDA to expedite review of ‘‘competitor generic therapies’’ or drugs with inadequate generic
competition, including holding meetings with or providing advice to the drug sponsor prior to submission of the application.

Hatch-Waxman Patent Certification and the 30-Month Stay

As part of the submission of an NDA or certain supplemental applications, NDA sponsors are required to list with the FDA each patent with claims that
cover the sponsor’s product or an approved method of using the product. Upon approval of a new drug, each of the patents listed in the application for the
drug is then published in the Orange Book. The FDA’s regulations governing patent listings were largely codified into law with enactment of the Orange
Book Modernization Act in January 2021. When an ANDA sponsor files its application with the FDA, the sponsor is required to certify to the FDA
concerning any patents listed for the reference product in the Orange Book. Specifically, the ANDA sponsor must certify that: (i) the required patent
information has not been filed; (ii) the listed patent has expired; (iii) the listed patent has not expired, but will expire on a particular date and approval is
sought after patent expiration; or (iv) the listed patent is invalid or will not be infringed by the new product. Moreover, to the extent that the Section 505(b)
(2) NDA sponsor is relying on studies conducted for an already approved product, the sponsor also is required to certify to the FDA concerning any patents
listed for the NDA-approved product in the Orange Book to the same extent that an ANDA sponsor would.

If the generic drug or follow-on drug sponsor does not challenge the innovator’s listed patents, FDA will not approve the ANDA or 505(b)(2) application
until all the listed patents claiming the referenced product have expired. A certification that the new generic product will not infringe the already approved
product’s listed patents or that such patents are invalid or unenforceable is called a Paragraph IV certification. If the ANDA sponsor has provided a
Paragraph IV certification to the FDA, the sponsor must also send notice of the Paragraph IV certification to the NDA owner and patent holders once the
ANDA has been accepted for filing by the FDA. The NDA owner and patent holders may then initiate a patent infringement lawsuit in response to the
notice of the Paragraph IV certification. The filing of a patent infringement lawsuit within 45 days after the receipt of a Paragraph IV certification
automatically prevents the FDA from approving the ANDA or 505(b)(2) NDA until the earliest of 30 months after the receipt of the Paragraph IV notice,
expiration of the patent or a decision in the infringement case that is favorable to the ANDA or 505(b)(2) NDA application.

Pediatric Studies and Exclusivity

Pediatric exclusivity is another type of non-patent marketing exclusivity in the United States and, if granted, for drug products, provides for the attachment
of an additional six months of marketing protection to the term of any existing patent or regulatory exclusivity, including the non-patent and orphan
exclusivity. This six-month exclusivity may be granted if an NDA sponsor submits pediatric data that fairly respond to a written request from the FDA for
such data. The data do not need to show the product is effective in the pediatric population studied, rather, if the clinical trial is deemed to fairly respond to
the FDA’s request, the additional protection is granted. If reports of requested pediatric studies are submitted to and accepted by the FDA within the
statutory time limits, whatever statutory or regulatory periods of exclusivity or patent protection cover the product are extended by six months. This is not a
patent term extension, but it effectively extends the regulatory period during which the FDA cannot approve another application. With regard to patents, the
six-month pediatric exclusivity period will not attach to

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any patents for which an ANDA or 505(b)(2) sponsor submitted a Paragraph IV patent certification, unless the NDA sponsor or patent owner first obtains a
court determination that the patent is valid and infringed by the proposed product.

Patent Term Restoration and Extension

A patent claiming a new drug product may be eligible for a limited patent term extension under the Hatch-Waxman Act, which permits a patent restoration
of up to five years for patent term lost during product development and the FDA regulatory review. The restoration period granted is typically one-half the
time between the effective date of an IND and the submission date of an NDA, plus the time between the submission date of an NDA and the ultimate
approval date. Patent term restoration cannot be used to extend the remaining term of a patent past a total of 14 years from the product’s approval date.
Only one patent applicable to an approved drug product is eligible for the extension, and the application for the extension must be submitted prior to the
expiration of the patent in question. A patent that covers multiple drugs for which approval is sought can only be extended in connection with one of the
approvals. The U.S. Patent and Trademark Office reviews and approves the application for any patent term extension or restoration in consultation with the
FDA.

Federal and State Data Privacy Laws

There are multiple privacy and data security laws that may impact our business activities, in the United States and in other countries where we conduct
trials or where we may do business in the future. These laws are evolving and may increase both our obligations and our regulatory risks in the future. In
the health care industry generally, under the federal Health Insurance Portability and Accountability Act of 1996, as amended by the Health Information
Technology for Economic and Clinical Health Act, or HIPAA, the HHS has issued regulations to protect the privacy and security of protected health
information, or PHI, used or disclosed by covered entities including certain healthcare providers, health plans and healthcare clearinghouses. HIPAA also
regulates standardization of data content, codes and formats used in healthcare transactions and standardization of identifiers for health plans and providers.
HIPAA also imposes certain obligations on the business associates of covered entities that obtain protected health information in providing services to or on
behalf of covered entities. While we are not a covered entity, as a business associate, we could be subject to penalties, including criminal penalties, and
contractual damages if we knowingly obtain or further disclose PHI from a covered entity, such as a health care provider or clinical research site, and
therefore we must ensure the proper authorizations are in place before we, or our vendors or business partners, obtain access to any PHI. In addition to
federal privacy regulations, there are a number of state laws governing confidentiality and security of health information that may be applicable to our
business. In addition to possible federal civil and criminal penalties for HIPAA violations, state attorneys general are authorized to file civil actions for
damages or injunctions in federal courts to enforce HIPAA and seek attorney’s fees and costs associated with pursuing federal civil actions. In addition,
state attorneys general (along with private plaintiffs) have brought civil actions seeking injunctions and damages resulting from alleged violations of
HIPAA’s privacy and security rules. State attorneys general also have authority to enforce state privacy and security laws. New laws and regulations
governing privacy and security may be adopted in the future as well.

At the state level, California recently enacted legislation that has been dubbed the first “GDPR-like” law in the United States. Known as the California
Consumer Privacy Act, or CCPA, it creates new individual privacy rights for consumers (as that word is broadly defined in the law) and places increased
privacy and security obligations on entities handling personal data of consumers or households. The CCPA went into effect on January 1, 2020 and requires
covered companies to provide new disclosures to California consumers, provide such consumers rights as it relates to their personal information, and allow
for a new cause of action for data breaches. Additionally, starting on January 1, 2023, the California Privacy Rights Act, or CPRA, significantly modified
the CCPA, including by expanding consumers’ rights, particularly with respect to certain sensitive personal information and creating new principles, such
as data minimization, purpose limitation, and storage limitation. The CPRA also created a new state agency that will be vested with authority to implement
and enforce the CCPA and the CPRA. The CCPA and CPRA could impact our business activities depending on how it is interpreted and exemplifies the
vulnerability of our business to not only cyber threats but also the evolving regulatory environment related to personal data and individually identifiable
health information. These provisions may apply to some of our business activities. In addition, other states, including Virginia, Colorado, Utah, and
Connecticut already have passed state privacy laws. Virginia’s privacy law also went into effect on January 1, 2023, and the laws in the other three states
will go into effect later in 2023. Other states will be considering these laws in the future, and Congress has also been debating a proposed federal privacy
law. These laws may impact our business activities, including our identification of research subjects, relationships with business partners and ultimately the
marketing and distribution of our products, if and once approved.

Because of the breadth of these laws and the narrowness of the statutory exceptions and regulatory safe harbors available under such laws, it is possible that
some of our current or future business activities, including certain clinical research, sales and marketing practices and the provision of certain items and
services to our customers, could be subject to challenge under one or more of such privacy and data security laws. The heightening compliance
environment and the need to build and maintain robust and secure systems to comply with different privacy compliance and/or reporting requirements in
multiple jurisdictions could increase the possibility that a healthcare company may fail to comply fully with one or more of these requirements. If our

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operations are found to be in violation of any of the privacy or data security laws or regulations described above that are applicable to us, or any other laws
that apply to us, we may be subject to penalties, including potentially significant criminal, civil and administrative penalties, damages, fines, imprisonment,
contractual damages, reputational harm, diminished profits and future earnings, additional reporting requirements and/or oversight if we become subject to
a consent decree or similar agreement to resolve allegations of non-compliance with these laws, and the curtailment or restructuring of our operations, any
of which could adversely affect our ability to operate our business and our results of operations. To the extent that any product candidates we may develop,
once approved, are sold in a foreign country, we may be subject to similar foreign laws.

Review and Approval of Drug Products Outside the United States

In order to market any product outside of the United States, a company must also comply with numerous and varying regulatory requirements of other
countries and jurisdictions regarding quality, safety and efficacy and governing, among other things, clinical trials, marketing authorization, commercial
sales and distribution of drug products. Whether or not it obtains FDA approval for a product, the company would need to obtain the necessary approvals
by the comparable foreign regulatory authorities before it can commence clinical trials or marketing of the product in those countries or jurisdictions. The
approval process ultimately varies between countries and jurisdictions and can involve additional product testing and additional administrative review
periods. The time required to obtain approval in other countries and jurisdictions might differ from and be longer than that required to obtain FDA
approval. Regulatory approval in one country or jurisdiction does not ensure regulatory approval in another, but a failure or delay in obtaining regulatory
approval in one country or jurisdiction may negatively impact the regulatory process in others.

Clinical Trial Approval in the European Union

Before the new Clinical Trials Regulation, (EU) No 536/2014, or the Clinical Trials Regulation, came into
application in January 2022, requirements for the conduct of clinical trials in the European Union including GCP were set forth in the Clinical Trials
Directive 2001/20/EC, or the Clinical Trials Directive, and the GCP Directive 2005/28/EC, or the GCP Directive. Pursuant to the Clinical Trials Directive
and the GCP Directive, as amended, a system for the approval of clinical trials in the European Union has been implemented through national legislation of
the EU member states. Under this system, approval must be obtained from the competent national authority of each EU member state in which a study is
planned to be conducted. To this end, a clinical trial application, or CTA, is submitted to the local competent authority in each country, or Member State,
where the clinical trial is being conducted, which must be supported by an investigational medicinal product dossier, or IMPD, and further supporting
information prescribed by Clinical Trials Directive and the GCP Directive and other applicable guidance documents. These documents may be amended
and/or updated by the European Commission at any time. Furthermore, a clinical trial may only be started after a competent ethics committee has issued a
favorable opinion on the clinical trial application in that country.

In April 2014, the Clinical Trials Regulation was adopted. The Clinical Trials Regulation aims to simplify and streamline the approval of clinical trials in
the EU. The main characteristics of the regulation include: a streamlined application procedure via a single entry point, the “EU portal”; a single set of
documents to be prepared and submitted for the application as well as simplified reporting procedures for clinical trial sponsors; and a harmonized
procedure for the assessment of applications for clinical trials, which is divided in two parts. Part I is assessed by the competent authorities of all EU
Member States in which an application for authorization of a clinical trial has been submitted (Member States concerned). Part II is assessed separately by
each Member State concerned. Strict deadlines have been established for the assessment of clinical trial applications. The role of the relevant ethics
committees in the assessment procedure will continue to be governed by the national law of the concerned EU Member State. However, overall related
timelines will be defined by the Clinical Trials Regulation.

The Clinical Trials Regulation came into application on January 31, 2022, following confirmation of full functionality of the Clinical Trials Information
System through an independent audit by the European Commission in mid-2020. The Clinical Trials Regulation came into application in all the EU
Member States and repealed the previous Clinical Trials Directive. According to the transitional provisions, if a clinical trial continues for more than three
years from the day on which the Clinical Trials Regulation became applicable, the Clinical Trials Regulation will at that time begin to apply to the clinical
trial.

Parties conducting certain clinical trials must, as in the United States, post clinical trial information in the European Union at the EudraCT website:
https://eudract.ema.europa.eu.

PRIME Designation in the European Union

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In March 2016, the EMA launched an initiative, the PRIority MEdicines, or PRIME, scheme, to facilitate development of product candidates in indications,
often rare, for which few or no therapies currently exist. The PRIME scheme is intended to encourage drug development in areas of unmet medical need
and provides accelerated assessment of products representing substantial innovation reviewed under the centralized procedure. Products from small- and
medium-sized enterprises, or SMEs, may qualify for earlier entry into the PRIME scheme than larger companies. Many benefits accrue to sponsors of
product candidates with PRIME designation, including but not limited to, early and proactive regulatory dialogue with the EMA, frequent discussions on
clinical trial designs and other development program elements, and accelerated marketing authorization application assessment once a dossier has been
submitted. Importantly, a dedicated agency contact and rapporteur from the Committee for Human Medicinal Products, or CHMP, or Committee for
Advanced Therapies are appointed early in the PRIME scheme, facilitating increased understanding of the product at the EMA’s committee level. A kick-
off meeting initiates these relationships and includes a team of multidisciplinary experts at the EMA to provide guidance on the overall development and
regulatory strategies.

Pediatric Studies

Prior to obtaining a marketing authorization in the EU, sponsors have to demonstrate compliance with all measures included in an EMA-approved Pediatric
Investigation Plan, or PIP, covering all subsets of the pediatric population, unless the EMA has granted a product-specific waiver, a class waiver or a
deferral for one or more of the measures included in the PIP. The respective requirements for all marketing authorization procedures are set forth in
Regulation (EC) No 1901/2006, which is referred to as the Pediatric Regulation. This requirement also applies when a company wants to add a new
indication, pharmaceutical form or route of administration for a medicine that is already authorized. The Pediatric Committee of the EMA, or PDCO, may
grant deferrals for some medicines, allowing a company to delay development of the medicine in children until there is enough information to demonstrate
its effectiveness and safety in adults. The PDCO may also grant waivers when development of a medicine in children is not needed or is not appropriate
because (a) the product is likely to be ineffective or unsafe in part or all of the pediatric population; (b) the disease or condition occurs only in adult
population; or (c) the product does not represent a significant therapeutic benefit over existing treatments for pediatric population. Before a marketing
authorization application can be filed, or an existing marketing authorization can be amended, the EMA determines that companies actually comply with
the agreed studies and measures listed in each relevant PIP.

Marketing Authorization

To obtain marketing approval of a product under EU regulatory systems, a sponsor must submit a marketing authorization application, or MAA, either
under a centralized or decentralized procedure. The centralized procedure provides for the grant of a single marketing authorization by the European
Commission that is valid for all EU member states. The centralized procedure is compulsory for specific products, including for medicines produced by
certain biotechnological processes, products designated as orphan medicinal products, advanced therapy products and products with a new active substance
indicated for the treatment of certain diseases. For products with a new active substance indicated for the treatment of other diseases and products that are
highly innovative or for which a centralized process is in the interest of patients, the centralized procedure may be optional.

Under the centralized procedure, the CHMP established at the EMA is responsible for conducting the initial assessment of a product. The CHMP is also
responsible for several post-authorization and maintenance activities, such as the assessment of modifications or extensions to an existing marketing
authorization. Under the centralized procedure in the European Union, the maximum timeframe for the evaluation of an MAA is 210 days, excluding clock
stops, when additional information or written or oral explanation is to be provided by the sponsor in response to questions of the CHMP. Accelerated
evaluation might be granted by the CHMP in exceptional cases, when a medicinal product is of major interest from the point of view of public health and in
particular from the viewpoint of therapeutic innovation. In this circumstance, the EMA ensures that the opinion of the CHMP is given within 150 days.

The decentralized procedure is available to sponsors who wish to market a product in various EU member states where such product has not received
marketing approval in any EU member state before. The decentralized procedure provides for approval by one or more other, or concerned, member states
of an assessment of an application performed by one member state designated by the sponsor, known as the reference member state. Under this procedure,
a sponsor submits an application based on identical dossiers and related materials, including a draft summary of product characteristics, and draft labeling
and package leaflet, to the reference member state and concerned member states. The reference member state prepares a draft assessment report and drafts
of the related materials within 210 days after receipt of a valid application. Within 90 days of receiving the reference member state’s assessment report and
related materials, each concerned member state must decide whether to approve the assessment report and related materials.

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If a member state cannot approve the assessment report and related materials on the grounds of potential serious risk to public health, the disputed points
are subject to a dispute resolution mechanism and may eventually be referred to the European Commission, whose decision is binding on all member states.

A marketing authorization may be granted only to a sponsor established in the European Union. Once the marketing authorization is obtained in all
member states of the European Union and study results are included in the product information, even when negative, the product is eligible for six months’
supplementary protection certificate extension. For orphan-designated medicinal products, the 10-year period of market exclusivity is extended to 12 years.

Conditional Approval

In particular circumstances, E.U. legislation (Article 14–a Regulation (EC) No 726/2004 (as amended by Regulation (EU) 2019/5) and Regulation (EC) No
507/2006 on Conditional Marketing Authorizations for Medicinal Products for Human Use) enables sponsors to obtain a conditional marketing
authorization prior to obtaining the comprehensive clinical data required for an application for a full marketing authorization. Such conditional approvals
may be granted for product candidates (including medicines designated as orphan medicinal products) if (1) the product candidate is intended for the
treatment, prevention or medical diagnosis of seriously debilitating or life-threatening diseases; (2) the product candidate is intended to meet unmet medical
needs of patients; (3) a marketing authorization may be granted prior to submission of comprehensive clinical data provided that the benefit of the
immediate availability on the market of the medicinal product concerned outweighs the risk inherent in the fact that additional data are still required; (4) the
risk-benefit balance of the product candidate is positive, and (5) it is likely that the sponsor will be in a position to provide the required comprehensive
clinical trial data. A conditional marketing authorization may contain specific obligations to be fulfilled by the marketing authorization holder, including
obligations with respect to the completion of ongoing or new clinical studies and with respect to the collection of pharmacovigilance data. Conditional
marketing authorizations are valid for one year, and may be renewed annually, if the risk-benefit balance remains positive, and after an assessment of the
need for additional or modified conditions or specific obligations. The timelines for the centralized procedure described above also apply with respect to
the review by the CHMP of applications for a conditional marketing authorization, but sponsors can also request EMA to conduct an accelerated
assessment, for instance in cases of unmet medical needs.

Periods of Authorization and Renewals in the European Union

A marketing authorization is valid for five years, in principle, and it may be renewed after five years on the basis of a reevaluation of the risk-benefit
balance by the EMA or by the competent authority of the relevant EU member state. To that end, the marketing authorization holder must provide the EMA
or the relevant competent authority of the EU member state with a consolidated version of the file in respect of quality, safety and efficacy, including all
variations introduced since the marketing authorization was granted, at least six months before the marketing authorization ceases to be valid. Once
renewed, the marketing authorization is valid for an unlimited period, unless the European Commission or the relevant competent authority of the EU
member state decides, on justified grounds relating to pharmacovigilance, to proceed with one additional five-year renewal period. Any marketing
authorization that is not followed by the marketing of the medicinal product on the EU market (in the case of the centralized procedure) or on the market of
the EU member state which delivered the marketing authorization within three years after authorization ceases to be valid.

Regulatory Data Exclusivity in the European Union

In the European Union, innovative medicinal products authorized in the European Union on the basis of a full marketing authorization application (as
opposed to an application for marketing authorization that relies on data available in the marketing authorization dossier for another, previously approved,
medicinal product) are entitled to eight years of data exclusivity. During this period, sponsors for authorization of generics of these innovative products
cannot rely on data contained in the marketing authorization dossier submitted for the innovative medicinal product. Innovative medicinal products are also
entitled to a total of ten years’ market exclusivity. During this ten-year period no generic of this medicinal product can be placed on the EU market. The
overall ten-year period will be extended to a maximum of eleven years if, during the first eight years of those ten years, the marketing authorization holder
obtains an authorization for one or more new therapeutic indications which, during the scientific evaluation prior to authorization, is held to bring a
significant clinical benefit in comparison with existing therapies. Even if a compound is considered to be a NCE so that the innovator gains the prescribed
period of data exclusivity, another company may market another version of the product if such company obtained marketing authorization based on an
MAA with a complete independent data package of pharmaceutical tests, preclinical tests and clinical trials.

Pediatric Exclusivity

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If a sponsor obtains a marketing authorization in all EU Member States, or a marketing authorization granted in the centralized procedure by the European
Commission, and the study results for the pediatric population are included in the product information, even when negative, the medicine is then eligible
for an additional six-month period of qualifying patent protection through extension of the term of the Supplementary Protection Certificate, or SPC, or
alternatively a one year extension of the regulatory market exclusivity from ten to eleven years, as selected by the marketing authorization holder.

Brexit and the Regulatory Framework in the United Kingdom

The U.K.'s withdrawal from the EU took place on January 31, 2020. The EU and the U.K. reached an agreement on their new partnership in the Trade and
Cooperation Agreement, or the Agreement, which was applied provisionally beginning on January 1, 2021 and which entered into force on May 1, 2021.
The Agreement focuses primarily on free trade by ensuring no tariffs or quotas on trade in goods, including healthcare products such as medicinal products.
Thereafter, the EU and the U.K. will form two separate markets governed by two distinct regulatory and legal regimes. As such, the Agreement seeks to
minimize barriers to trade in goods while accepting that border checks will become inevitable as a consequence that the U.K. is no longer part of the single
market. As of January 1, 2021, the Medicines and Healthcare products Regulatory Agency, or the MHRA, became responsible for supervising medicines
and medical devices in Great Britain, comprising England, Scotland and Wales under domestic law whereas Northern Ireland continues to be subject to EU
rules under the Northern Ireland Protocol. The MHRA will rely on the Human Medicines Regulations 2012 (SI 2012/1916) (as amended), or the HMR, as
the basis for regulating medicines. The HMR has incorporated into the domestic law, the body of EU law instruments governing medicinal products that
pre-existed prior to the U.K.’s withdrawal from the EU. Since a significant proportion of the regulatory framework for pharmaceutical products in the U.K.
covering the quality, safety, and efficacy of pharmaceutical products, clinical trials,
marketing authorization, commercial sales, and distribution of pharmaceutical products is derived from EU directives and
regulations, Brexit may have a material impact upon the regulatory regime with respect to the development, manufacture,
importation, approval and commercialization of our product candidates in the U.K. For example, the U.K. is no longer covered
by the centralized procedures for obtaining EU-wide marketing authorization from the EMA, and a separate marketing
authorization will be required to market our product candidates, including vadadustat, in the U.K.

Access Consortium

In October 2020, the MHRA joined the Access Consortium along with the Australian Therapeutic Goods Administration of Australia, Health Canada,
Health Sciences Authority of Singapore and Swissmedic. The consortium is a coalition of these regulatory authorities that work together to promote greater
regulatory collaboration and alignment of regulatory requirements. The consortium’s goal is to maximize international co-operation between partners in the
consortium, reduce duplication, and increase each agency’s capacity to ensure patients have timely access to high quality, safe and effective therapeutic
products. The MHRA commenced work-sharing applications with Access partners on January 1, 2021. Access Consortium working group members have
regular meetings to exchange information on regulatory issues and challenges faced by the participating regulatory agencies, including issues on clinical
trials, marketing authorizations, product manufacturing site inspections, post-marketing surveillance, joint development of technical guidelines or
regulatory standards, and collaboration on information platforms. The Access consortium has developed three authorization procedures: the New Active
Substance and Biosimilar Work Sharing Initiatives and the Generic Medicine Work Sharing Initiative.

General Data Protection Regulation
Many countries outside of the United States maintain rigorous laws governing the privacy and security of personal information. The collection, use,
disclosure, transfer, or other processing of personal data, including personal health data, regarding individuals who are located in the EEA, and the
processing of personal data that takes place in the EEA, is subject to the European Union General Data Protection Regulation, or GDPR, which became
effective on May 25, 2018. The GDPR is wide-ranging in scope and imposes numerous requirements on companies that process personal data, and it
imposes heightened requirements on companies that process health and other sensitive data, such as requiring in many situations that a company obtain the
consent of the individuals to whom the sensitive personal data relate before processing such data. Examples of obligations imposed by the GDPR on
companies processing personal data that fall within the scope of the GDPR include providing information to individuals regarding data processing
activities, implementing safeguards to protect the security and confidentiality of personal data, appointing a data protection officer, providing notification of
data breaches and taking certain measures when engaging third-party processors.

The GDPR also imposes strict rules on the transfer of personal data to countries outside the EEA, including the United States, and permits data protection
authorities to impose large penalties for violations of the GDPR, including potential fines of up to €20 million or 4% of annual global revenues, whichever
is greater. The GDPR also confers a private right of action on data subjects and consumer associations to lodge complaints with supervisory authorities,
seek judicial remedies, and obtain

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compensation for damages resulting from violations of the GDPR. Compliance with the GDPR is a rigorous and time-intensive process that may increase
the cost of doing business or require companies to change their business practices to ensure full compliance.

There are ongoing concerns about the ability of companies to transfer personal data from the EU to other countries. In July 2020, the Court of Justice of the
European Union, or the CJEU, invalidated the EU-U.S. Privacy Shield framework, one of the mechanisms used to legitimize the transfer of personal data
from the EEA to the United States. The CJEU decision also drew into question the long-term viability of an alternative means of data transfer, the standard
contractual clauses, for transfers of personal data from the EEA to the United States. This CJEU decision may lead to increased scrutiny on data transfers
from the EU to the U.S. generally and increase our costs of compliance with data privacy legislation as well as our costs of negotiating appropriate privacy
and security agreements with our vendors and business partners.

Additionally, in October 2022, U.S. President Biden signed an executive order to implement a new EU-U.S. Data Privacy Framework, which would serve
as a replacement to the EU-U.S. Privacy Shield. The EU initiated the process to adopt the EU-U.S. Data Privacy Framework in December 2022. It is
unclear if and when the framework will be finalized and whether it will be challenged in court. The uncertainty around this issue may further impact our
business operations in the EU.

As with other issues related to Brexit, there are open questions about how personal data will be protected in the U.K. and whether personal information can
transfer from the EU to the U.K. Following the withdrawal of the U.K. from the EU, the U.K. Data Protection Act 2018 applies to the processing of
personal data that takes place in the U.K. and includes parallel obligations to those set forth by GDPR. While the Data Protection Act 2018 in the U.K. that
“implements” and complements the GDPR has achieved Royal Assent on May 23, 2018 and is now effective in the U.K., it is still unclear whether transfer
of data from the EEA to the U.K. will remain lawful under GDPR. The U.K. government has already determined that it considers all European Union and
EEA member states to be adequate for the purposes of data protection, ensuring that data flows from the U.K. to the European Union/EEA remain
unaffected. In addition, a recent decision from the European Commission appears to deem the U.K. as being “essentially adequate” for purposes of data
transfer from the EU to the U.K., although this decision may be re-evaluated in the future.

Beyond GDPR, there are privacy and data security laws in a growing number of countries around the world. While many loosely follow GDPR as a model,
other laws contain different or conflicting provisions. These laws will impact our ability to conduct our business activities, including both our clinical trials
and any eventual sale and distribution of commercial products.

Pharmaceutical Coverage, Pricing and Reimbursement

In the United States and markets in other countries, patients who are prescribed treatments for their conditions and providers performing the prescribed
services generally rely on third-party payors to reimburse all or part of the associated healthcare costs. Significant uncertainty exists as to the coverage and
reimbursement status of products approved by the FDA and other government authorities. Thus, even if a product candidate is approved, sales of the
product will depend, in part, on the extent to which third-party payors, including government health programs in the United States such as Medicare and
Medicaid, commercial health insurers and managed care organizations, provide coverage, and establish adequate reimbursement levels for, the product. The
process for determining whether a payor will provide coverage for a product may be separate from the process for setting the price or reimbursement rate
that the payor will pay for the product once coverage is approved. Third-party payors are increasingly challenging the prices charged, examining the
medical necessity, and reviewing the cost-effectiveness of medical products and services and imposing controls to manage costs. Third-party payors may
limit coverage to specific products on an approved list, also known as a formulary, which might not include all of the approved products for a particular
indication. In addition, third-party payors may impose prior authorization or step edit requirements requiring patients to have tried other therapies prior to
our products for coverage. Payors may also decline to include our products or product candidates on their formulary, which means that unless healthcare
providers seek a medical exception for coverage, the payors will not pay for the product.

In order to secure coverage and reimbursement for any product that might be approved for sale, a company may need to conduct expensive
pharmacoeconomic studies in order to demonstrate the medical necessity and cost-effectiveness of the product, in addition to the costs required to obtain
FDA or other comparable marketing approvals. Nonetheless, product candidates may not be considered medically necessary or cost effective. A decision
by a third-party payor not to cover a product candidate could reduce physician utilization once the product is approved and have a material adverse effect
on sales, results of operations and financial condition. Additionally, a payor’s decision to provide coverage for a product does not imply that an adequate
reimbursement rate will be approved. Further, one payor’s determination to provide coverage for a drug product does not assure that other payors will also
provide coverage and reimbursement for the product, and the level of coverage and reimbursement can differ significantly from payor to payor.

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Dialysis-related drugs are included in the ESRD prospective payment system (PPS) bundled payment and are grouped into functional categories such as
anemia management and bone and mineral metabolism, except that oral-only drugs are exempted from inclusion until 2025. In a final ESRD PPS rule
published in October 2019, CMS confirmed that it will expand the TDAPA to most new dialysis drugs approved by the FDA after January 1, 2020. The
TDAPA provides separate payment for eligible new drugs for two years based on the drug’s Average Sales Price, or ASP, that will be in addition to the base
rate in order to facilitate the adoption of innovative therapies. Although there are several details that need further clarification, including precise timing
related to receiving codes to allow for reimbursement under TDAPA, which are assigned on a quarterly basis, the rule provides support for our assumption
that new anemia treatments, including those in the HIF-PH inhibitor class, will be included in the ESRD PPS bundle and will be eligible for separate
payment initially under TDAPA.

The containment of healthcare costs also has become a priority of federal, state and foreign governments and the prices of drugs have been a focus in this
effort. Governments have shown significant interest in implementing cost-containment programs, including price controls, restrictions on reimbursement
and requirements for substitution of generic products. Adoption of price controls and cost-containment measures, and adoption of more restrictive policies
in jurisdictions with existing controls and measures, could further limit a company’s revenue generated from the sale of any approved products. Coverage
policies and third-party reimbursement rates may change at any time. Even if favorable coverage and reimbursement status is attained for one or more
products for which a company or its collaborators receive marketing approval, less favorable coverage policies and reimbursement rates may be
implemented in the future.

Outside the United States, ensuring adequate coverage and payment for a product also involves challenges. Pricing of prescription pharmaceuticals is
subject to governmental control in many countries. Pricing negotiations with governmental authorities can extend well beyond the receipt of regulatory
marketing approval for a product and may require a clinical trial that compares the cost effectiveness of a product to other available therapies. The conduct
of such a clinical trial could be expensive and result in delays in commercialization.

In the European Union, pricing and reimbursement schemes vary widely from country to country. Some countries provide that products may be marketed
only after a reimbursement price has been agreed. Some countries may require the completion of additional studies that compare the cost-effectiveness of a
particular drug candidate to currently available therapies or so-called health technology assessments, in order to obtain reimbursement or pricing approval.
For example, the European Union provides options for its member states to restrict the range of products for which their national health insurance systems
provide reimbursement and to control the prices of medicinal products for human use. EU member states may approve a specific price for a product or it
may instead adopt a system of direct or indirect controls on the profitability of the company placing the product on the market. Other member states allow
companies to fix their own prices for products but monitor and control prescription volumes and issue guidance to physicians to limit prescriptions.
Recently, many countries in the European Union have increased the amount of discounts required on pharmaceuticals and these efforts could continue as
countries attempt to manage healthcare expenditures, especially in light of the severe fiscal and debt crises experienced by many countries in the European
Union. The downward pressure on health care costs in general, particularly prescription drugs, has become intense. As a result, increasingly high barriers
are being erected to the entry of new products. Political, economic and regulatory developments may further complicate pricing negotiations, and pricing
negotiations may continue after reimbursement has been obtained. Reference pricing used by various EU member states, and parallel trade, i.e., arbitrage
between low-priced and high-priced member states, can further reduce prices. There can be no assurance that any country that has price controls or
reimbursement limitations for pharmaceutical products will allow favorable reimbursement and pricing arrangements for any products, if approved in those
countries.

Dialysis Organizations Protocols

Dialysis organizations have their own formularies that list primary or preferred therapeutic options based on contracting status with drug manufacturers.
While a prescriber may make their own independent decision to prescribe what they determine most appropriate for a given patient, any non-formulary
therapeutic options are only available through an exception process based on clinical need. Similar to how payor coverage may affect the sales of a product,
formulary status within dialysis organizations may affect what products are prescribed within that specific organization. Therefore, if a product is not on a
formulary, the prescribers within that organization may be less likely to prescribe that product or may have a difficult time prescribing that product,
resulting in less sales. Further, one dialysis organization’s determination to add a product to their formulary does not assure that other dialysis organizations
will also add the product to theirs. There is always a risk a dialysis organization will not contract with a drug manufacturer for a specific product, resulting
in that product not being on that organization’s formulary. Additionally, dialysis organizations typically assess a product’s efficacy before adding it to their
formulary. Their process for assessing a product may differ among organizations and the timing of such assessment could delay adding such treatment to
formulary, further affecting product sales.

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Healthcare Law and Regulation

Healthcare providers and third-party payors play a primary role in the recommendation and prescription of drug products that are granted marketing
approval. Arrangements with providers, consultants, third-party payors and customers are subject to broadly applicable fraud and abuse, anti-kickback,
false claims laws, reporting of payments to physicians, teaching hospitals and other healthcare providers, patient privacy laws and regulations, and other
healthcare laws and regulations that may constrain business and/or financial arrangements. Restrictions under applicable federal and state healthcare laws
and regulations include the following:

•

•

•

•

•

•

•

•

•

the federal Anti-Kickback Statute, which prohibits, among other things, persons and entities from knowingly and willfully soliciting,
offering, paying, receiving or providing remuneration, directly or indirectly, in cash or in kind, to induce or reward either the referral of
an individual for, or the purchase, order or recommendation of, any good or service, for which payment may be made, in whole or in part,
under a federal healthcare program such as Medicare and Medicaid;

the federal civil and criminal false claims laws, including the civil False Claims Act, and civil monetary penalties laws, which prohibit
individuals or entities from, among other things, knowingly presenting, or causing to be presented, to the federal government, claims for
payment that are false, fictitious or fraudulent or knowingly making, using or causing to be made or used a false record or statement to
avoid, decrease or conceal an obligation to pay money to the federal government

HIPAA, which created additional federal criminal laws that prohibit, among other things, knowingly and willfully executing, or
attempting to execute, a scheme to defraud any healthcare benefit program or making false statements relating to healthcare matters;

HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act, and their respective implementing
regulations, including the Final Omnibus Rule published in January 2013, which impose obligations, including mandatory contractual
terms, with respect to safeguarding the privacy, security and transmission of individually identifiable health information;

the federal false statements statute, which prohibits knowingly and willfully falsifying, concealing or covering up a material fact or
making any materially false statement in connection with the delivery of or payment for healthcare benefits, items or services;

the U.S. Foreign Corrupt Practices Act, or FCPA, which prohibits companies and their intermediaries from making, or offering or
promising to make improper payments to non-U.S. officials for the purpose of obtaining or retaining business or otherwise seeking
favorable treatment;

the federal transparency requirements, known as the federal Physician Payments Sunshine Act (renamed the Open Payments Act), under
the Patient Protection and Affordable Care Act, as amended by the Health Care Education Reconciliation Act, or ACA, which requires
certain manufacturers of drugs, devices, biologics and medical supplies to report annually to the Centers for Medicare & Medicaid
Services, or CMS, within the United States Department of Health and Human Services, information related to payments and other
transfers of value made by that entity to physicians, other healthcare providers and teaching hospitals, as well as ownership and
investment interests held by physicians and their immediate family members;

the PDMA and its implementation regulations, as well as the DSCSA, which regulate the distribution and tracing of prescription drugs
and prescription drug samples at the federal level, and set minimum standards for the regulation of drug distributors by the states; and

analogous state and foreign laws and regulations, such as state anti-kickback and false claims laws, which may apply to healthcare items
or services that are reimbursed by third-party payors, including private insurers, and state gift ban and disclosure law requirements that
differ from the federal Physician Payments Sunshine Act in terms of the nature and type of transfers of value that are reportable and the
types of covered recipients.

Violations of these laws are punishable by criminal and/or civil sanctions, including, in some instances, exclusion from participation in federal and state
health care programs, such as Medicare and Medicaid. Ensuring compliance is time consuming and costly. Similar healthcare laws and regulations exist in
the EU and other jurisdictions, including reporting requirements detailing interactions with and payments to healthcare providers and laws governing the
privacy and security of personal information.

Some state laws require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines, such as the
Pharmaceutical Research and Manufacturers of America Code on Interactions with Health Care Professionals, known as the PhRMA Code. State and
foreign laws also govern the privacy and security of health information in

42

some circumstances, many of which differ from each other in significant ways and often are not preempted by HIPAA, thus complicating compliance
efforts.

Healthcare Reform

A primary trend in the United States healthcare industry and elsewhere is cost containment. There have been a number of federal and state proposals during
the last few years regarding the pricing of pharmaceutical and biopharmaceutical products, limiting coverage and reimbursement for drugs and other
medical products, government control and other changes to the healthcare system in the United States.

By way of example, the United States and state governments continue to propose and pass legislation designed to reduce the cost of healthcare.

In March 2010, the United States Congress enacted the ACA, which, among other things, includes changes to the coverage and payment for products under
government health care programs. Other legislative changes have been proposed and adopted since the ACA was enacted. In August 2011, the Budget
Control Act of 2011, among other things, created measures for spending reductions by Congress. A Joint Select Committee on Deficit Reduction, tasked
with recommending a targeted deficit reduction of at least $1.2 trillion for the years 2013 through 2021, was unable to reach required goals, thereby
triggering the legislation’s automatic reduction to several government programs. These changes included aggregate reductions to Medicare payments to
providers of up to 2% per fiscal year, which went into effect in April 2013 and will remain in effect through 203. Pursuant to the Coronavirus Aid, Relief
and Economic Security Act, or CARES Act, and subsequent legislation, these Medicare sequester reductions were suspended and reduced through the end
of June 2022 but the full 2% cut has resumed as of July 2022. Under current legislation, the actual reductions in Medicare payments may vary up to 4%.

Since enactment of the ACA, there have been, and continue to be, numerous legal challenges and Congressional actions to repeal and replace provisions of
the law. For example, with enactment of the Tax Cuts and Jobs Act of 2017, or the Tax Act, which was signed by the prior administration on December 22,
2017, Congress repealed the “individual mandate.” The repeal of this provision, which requires most Americans to carry a minimal level of health
insurance, became effective in 2019. On December 14, 2018, a U.S. District Court judge in the Northern District of Texas ruled that the individual mandate
portion of the ACA is an essential and inseverable feature of the ACA, and therefore because the mandate was repealed as part of the Tax Act, the
remaining provisions of the ACA are invalid as well. The U.S. Supreme Court heard this case on November 10, 2020 and, on June 17, 2021, dismissed this
action after finding that the plaintiffs do not have standing to challenge the constitutionality of the ACA. Litigation and legislation over the ACA are likely
to continue, with unpredictable and uncertain results.

The prior administration also took executive actions to undermine or delay implementation of the ACA, including directing federal agencies with
authorities and responsibilities under the ACA to waive, defer, grant exemptions from, or delay the implementation of any provision of the ACA that would
impose a fiscal or regulatory burden on states, individuals, healthcare providers, health insurers, or manufacturers of pharmaceuticals or medical devices.
On January 28, 2021, however, President Biden rescinded those orders and issued a new executive order that directs federal agencies to reconsider rules
and other policies that limit access to healthcare, and consider actions that will protect and strengthen that access. Under this order, federal agencies are
directed to re-examine: policies that undermine protections for people with pre-existing conditions, including complications related to COVID-19;
demonstrations and waivers under Medicaid and the ACA that may reduce coverage or undermine the programs, including work requirements; policies that
undermine the Health Insurance Marketplace or other markets for health insurance; policies that make it more difficult to enroll in Medicaid and under the
ACA; and policies that reduce affordability of coverage or financial assistance, including for dependents.

Pharmaceutical Prices

The prices of prescription pharmaceuticals have also been the subject of considerable discussion in the United States. There have been several recent U.S.
congressional inquiries, as well as proposed and enacted state and federal legislation designed to, among other things, bring more transparency to
pharmaceutical pricing, review the relationship between pricing and manufacturer patient programs, and reduce the costs of pharmaceuticals under
Medicare and Medicaid. In 2020, the prior administration issued several executive orders intended to lower the costs of prescription products and certain
provisions in these orders have been incorporated into regulations. These regulations include an interim final rule implementing a most favored nation
model for prices that would tie Medicare Part B payments for certain physician-administered pharmaceuticals to the lowest price paid in other
economically advanced countries, effective January 1, 2021. That rule, however, has been subject to a nationwide preliminary injunction and, on December
29, 2021, CMS issued a final rule to rescind it. With issuance of this

43

rule, CMS stated that it will explore all options to incorporate value into payments for Medicare Part B pharmaceuticals and improve beneficiaries' access
to evidence-based care.

In addition, in October 2020, HHS and the FDA published a final rule allowing states and other entities to develop a Section 804 Importation Program, or
SIP, to import certain prescription drugs from Canada into the United States. The final rule is currently the subject of ongoing litigation, but at least six
states (Vermont, Colorado, Florida, Maine, New Mexico, and New Hampshire) have passed laws allowing for the importation of drugs from Canada with
the intent of developing SIPs for review and approval by the FDA. Further, on November 20, 2020, HHS finalized a regulation removing safe harbor
protection for price reductions from pharmaceutical manufacturers to plan sponsors under Part D, either directly or through pharmacy benefit managers,
unless the price reduction is required by law. The final rule would eliminate the current safe harbor drug rebates and create new safe harbors for beneficiary
point-of-sale discounts and pharmacy benefit manager service fees. It originally was set to go into effect on January 1, 2022, but with passage Inflation
Reduction Act has been delayed by Congress to January 1, 2032.

On July 9, 2021, President Biden signed Executive Order 14063, which focuses on, among other things, the price of pharmaceuticals. The Order directs
HHS to create a plan within 45 days to combat “excessive pricing of prescription pharmaceuticals and enhance domestic pharmaceutical supply chains, to
reduce the prices paid by the federal government for such pharmaceuticals, and to address the recurrent problem of price gouging.” On September 9, 2021,
HHS released its plan to reduce pharmaceutical prices. The key features of that plan are to: (a) make pharmaceutical prices more affordable and equitable
for all consumers and throughout the health care system by supporting pharmaceutical price negotiations with manufacturers; (b) improve and promote
competition throughout the prescription pharmaceutical industry by supporting market changes that strengthen supply chains, promote biosimilars and
generic drugs, and increase transparency; and (c) foster scientific innovation to promote better healthcare and improve health by supporting public and
private research and making sure that market incentives promote discovery of valuable and accessible new treatments.

More recently, on August 16, 2022, the Inflation Reduction Act of 2022, or IRA, was signed into law by President Biden. The new legislation has
implications for Medicare Part D, which is a program available to individuals who are entitled to Medicare Part A or enrolled in Medicare Part B to give
them the option of paying a monthly premium for outpatient prescription drug coverage. Among other things, the IRA requires manufacturers of certain
drugs to engage in price negotiations with Medicare (beginning in 2026), with prices that can be negotiated subject to a cap; imposes rebates under
Medicare Part B and Medicare Part D to penalize price increases that outpace inflation (first due in 2023); and replaces the Part D coverage gap discount
program with a new discounting program (beginning in 2025). The IRA permits the Secretary of HHS to implement many of these provisions through
guidance, as opposed to regulation, for the initial years.

Specifically, with respect to price negotiations, Congress authorized Medicare to negotiate lower prices for certain costly single-source drug and biologic
products that do not have competing generics or biosimilars and are reimbursed under Medicare Part B and Part D. CMS may negotiate prices for ten high-
cost drugs paid for by Medicare Part D starting in 2026, followed by 15 Part D drugs in 2027, 15 Part B or Part D drugs in 2028, and 20 Part B or Part D
drugs in 2029 and beyond. This provision applies to drug products that have been approved for at least 9 years and biologics that have been licensed for 13
years, but it does not apply to drugs and biologics that have been approved for a single rare disease or condition. Further, the legislation subjects drug
manufacturers to civil monetary penalties and a potential excise tax for failing to comply with the legislation by offering a price that is not equal to or less
than the negotiated “maximum fair price” under the law or for taking price increases that exceed inflation. The legislation also requires manufacturers to
pay rebates for drugs in Medicare Part D whose price increases exceed inflation. The new law also caps Medicare out-of-pocket drug costs at an estimated
$4,000 a year in 2024 and, thereafter beginning in 2025, at $2,000 a year.

At the state level, individual states are increasingly aggressive in passing legislation and implementing regulations designed to control pharmaceutical and
biological product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost
disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing. A number of
states, for example, require drug manufacturers and other entities in the drug supply chain, including health carriers, pharmacy benefit managers, wholesale
distributors, to disclose information about pricing of pharmaceuticals. In addition, regional healthcare organizations and individual hospitals are
increasingly using bidding procedures to determine what pharmaceutical products and which suppliers will be included in their prescription pharmaceutical
and other healthcare programs. These measures could reduce the ultimate demand for our products, once approved, or put pressure on our product pricing.
We expect that additional state and federal healthcare reform measures will be adopted in the future, any of which could limit the amounts that federal and
state governments will pay for healthcare products and services, which could result in reduced demand for our product candidates or additional pricing
pressures.

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Laws Relating to Foreign Trade

We are subject to various federal and foreign laws that govern our international business practices. These laws include the FCPA, which prohibits U.S.
companies and their representatives from paying, offering to pay, promising, or authorizing the payment of anything of value to any foreign government
official, government staff member, political party, or political candidate for the purposes of obtaining or retaining business, or to otherwise obtain favorable
treatment or influence a person working in an official capacity. In many countries, the health care professionals we regularly interact with may meet the
FCPA’s definition of a foreign government official. Additionally, interactions with or on the part of our partners, collaborators, contract research
organizations, vendors or other agents may also implicate the FCPA. The FCPA also requires public companies to make and keep books and records that
accurately and fairly reflect their transactions and to devise and maintain an adequate system of internal accounting controls. Compliance with the FCPA is
expensive and difficult, particularly in countries in which corruption is a recognized problem. In addition, the FCPA presents unique challenges in the
pharmaceutical industry because, in many countries, hospitals are operated by the government, and doctors and other hospital employees are considered
foreign officials. Certain payments made by pharmaceutical companies to hospitals in connection with clinical trials and other work have been deemed to
be improper payments to government officials and have led to FCPA enforcement actions.

Our international operations could also be subject to compliance with national laws of other countries, such as the United Kingdom Bribery Act. of 2010,
or U.K. Bribery Act. The U.K. Bribery Act applies to any company “carrying on business” in the U.K., irrespective of where the offending conduct occurs.
The U.K. Bribery Act applies to bribery activities both in the public and private sector and prohibits the provision of an “advantage” intended to induce or
reward “improper performance” of the recipient’s function. The failure by a company to prevent third parties from providing a bribe on its behalf could also
constitute an offense. Penalties under the U.K. Bribery Act include potentially unlimited fines for companies and criminal sanctions for corporate officers
under certain circumstances.

There are local antibribery and anticorruption laws in countries where we are conducting clinical trials, such as Brazil and Russia, and many of these also
carry the risk of significant financial or criminal penalties. Our clinical trial operations could also result in enforcement actions by U.S., U.K., or other
governmental authorities. There are also trade laws within the United States and in other regions that regulate the sale, purchase, import, export, reexport,
transfer and shipment of goods, currency, products, materials, services and technology. Violations of these laws can lead to serious consequences, including
substantial fines.

Other Regulations

We are also subject to numerous federal, state and local laws relating to such matters as safe working conditions, manufacturing practices, environmental
protection, fire hazard control, and disposal of hazardous or potentially hazardous substances. We may incur significant costs to comply with such laws and
regulations now or in the future.

Employees and Human Capital Resources

As of December 31, 2022, we had 205 employees, all but one of whom were full-time. None of our employees are represented by any collective bargaining
unit. We believe that we maintain good relations with our employees.

Retention, growth, training and development of our employees are integral to our success. We offer competitive compensation (including base salary,
incentive bonus, and long-term equity awards tied to the value of our stock price) as well as benefits packages designed to attract, motivate and reward
talented individuals who possess the skills necessary to support our business objectives, assist in the achievement of our strategic goals and create value for
our stockholders. Our compensation program is designed to differentiate us from our competition and incentivize achievement of corporate goals,
individual performance and demonstrate our corporate values. In addition, we provide development and leadership opportunities to our employees to
cultivate talent throughout the Company.

We are committed to our employees’ health, safety and well-being. In March 2020, in response to the COVID-19 pandemic, we adjusted our workplace
policies to allow employees to work from home and in 2021 we remodeled our work paradigm to one that is flexible and designed to accommodate a range
of work profiles from office based, to hybrid to fully remote, to field-based, allowing us to maximize productivity and performance. Recognizing the
pandemic had an impact on well-being as well as the availability of support services, we launched Modern Health, a platform focused on services to
support employees’ and their dependents in areas such as mental, physical, financial, social and professional health, making it easier for them to get
personalized care faster.

45

We are also committed to diversity, equality and inclusion, and this is reflected in Akebia’s leadership. Two members of our Board of Directors, Cynthia
Smith and LeAnne M. Zumwalt, are women, and women comprise approximately 45% of our senior management team. In addition, Ron Frieson has
served on our Board of Directors since November 2021, increasing the diversity of our Board of Directors.

With the goal of ensuring every employee is included, supported, and treated equitably, we developed a team (IDEA – Inclusion, Diversity & Equity
Alliance) to support and guide Akebia as a diverse, inclusive, and culturally intelligent workplace. Over the past two and a half years this team has worked
with executive leadership to identify areas for growth and education and move forward several initiatives that will enable us to continue to build an
inclusive workplace and a diverse workforce. We also provide access to LinkedIn Learning, an online learning platform that recommends expert-led
courses for relevant skill development for all of our employees.

In addition, we support kidney patient communities where we live and work. In the United States, we have a patient services program, Akebia Cares,
designed to provide one-on-one support to help communicate individual benefits and available resources for patients today facing financial obstacles that
keep them from accessing important medications. In 2022, we provided over $5.3 million worth of Auryxia for free to approximately 14,000 patients
needing assistance. We also support and work closely with multiple kidney patient advocacy organizations, including the National Kidney Foundation, the
American Kidney Fund, the Renal Support Network, Dialysis Patient Citizens and American Association of Kidney Patients. We believe our involvement
with these organizations shows our commitment to our purpose of bettering the life of each person impacted by kidney disease.

Available Information

Our principal executive offices are located at 245 First Street, Cambridge, Massachusetts 02142. Our telephone number is (617) 871-2098. Our website
address is www.akebia.com. The information on our website or that may be accessed by links on our website is not incorporated by reference into this
Form 10-K. We make available, free of charge and through our website, our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current
Reports on Form 8-K, and any amendments to any such reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of
1934, as amended, as soon as reasonably practicable after they are electronically filed with or furnished to the U.S. Securities and Exchange Commission.

46

Item 1A. Risk Factors.

We face a variety of risks and uncertainties in our business. Additional risks and uncertainties not presently known to us or that we currently believe to be
immaterial may also become important factors that affect our business. If any of the following risks occurs, our business, financial condition, financial
statements, results of operations and future growth prospects could be materially and adversely affected.

Risks Related to our Financial Position, Need for Additional Capital and Growth Strategy

We have incurred significant losses since our inception, and anticipate that we will continue to incur significant losses and cannot guarantee when, if
ever, we will become profitable or attain positive cash flows.

Investment in pharmaceutical product development and commercialization is highly speculative because it requires upfront capital expenditures and there is
significant risk that a product candidate will fail to gain marketing approval or that an approved product will not be commercially viable. Since our
inception, we have devoted most of our resources to research and development, including our preclinical and clinical development activities and
commercialization of Auryxia. We have financed our operations primarily through sales of equity securities, our strategic collaborations and product
revenues, a royalty monetization transaction and debt. Prior to the merger, or the Merger, whereby Keryx Biopharmaceuticals, Inc., or Keryx, became our
wholly owned subsidiary, we had no products approved for commercial sale and had not generated any revenue from the sale of products. We are not
currently profitable, and we have incurred net losses each year since our inception, including a net loss of $92.6 million for the year ended December 31,
2022. As of December 31, 2022, we had an accumulated deficit of $1.6 billion. We cannot guarantee when, if ever, we will become profitable.

In March 2022, we received a complete response letter, or CRL, from the FDA regarding our NDA for vadadustat, our lead investigational product
candidate, for the treatment of anemia associated with CKD. The FDA concluded that the data in the NDA do not support a favorable benefit-risk
assessment of vadadustat for dialysis and non-dialysis patients. In October 2022, we submitted a Formal Dispute Resolution Request, or FDRR, to the
FDA. The FDRR focuses on the favorable balance between the benefits and risks of vadadustat for the treatment of anemia due to CKD in adult patients on
dialysis in light of safety concerns expressed by the FDA in the CRL for dialysis patients related to the rate of adjudicated thromboembolic events driven
by vascular access thrombosis for vadadustat compared to the active comparator and the risk of drug-induced liver injury. In February 2023, we received a
second interim response from the FDA to our FDRR, and there can be no assurances that we will be successful in our appeal and obtain approval for
vadadustat in a timely manner, on favorable terms, or at all. As a result, the regulatory approval process for vadadustat in the U.S. is highly uncertain. We
may not obtain approval at all, and if we are able to obtain approval, the expense and time to do so could adversely impact our ability to successfully
commercialize vadadustat or conduct our other business operations, and our financial condition could be materially harmed.

Our ability to generate product revenue and achieve profitability depends on the overall success of Auryxia , vadadustat, if approved, and any current or
future product candidates, including those that may be in-licensed or acquired, which depends on several factors, including:

(R)

•

•

•

•
•

•

obtaining adequate or favorable pricing and reimbursement from private and governmental payors for Auryxia, vadadustat, if approved, and any
other product or product candidate, including those that may be in-licensed or acquired;
obtaining and maintaining market acceptance of Auryxia, vadadustat, if approved, and any other product candidate, including those that may be
in-licensed or acquired;
the size of any market in which Auryxia, vadadustat and any other product or product candidate, including those that may be in-licensed or
acquired, receives approval and obtaining adequate market share in those markets;
addressing the issues identified in the CRL for vadadustat that we received from the FDA and the outcome of our appeal;
the timing and scope of marketing approvals for vadadustat, if approved, and any other product candidate, if approved, including those that may be
in-licensed or acquired; maintaining marketing approvals for Auryxia, vadadustat, if approved, and any other product, including those that may be
in-licensed or acquired;
actual or perceived advantages or disadvantages of our products or product candidates as compared to alternative treatments, including their
respective safety, tolerability and efficacy profiles, the potential convenience and ease of administration and cost;

• maintaining an acceptable safety and tolerability profile of our approved products, including the frequency and severity of any side effects;
the willingness of the target patient population to try new therapies and of physicians to prescribe these therapies, based, in part, on their
•
perception of our clinical trial data and/or the actual or perceived safety, tolerability and efficacy profile;

47

•

•

establishing  and  maintaining  supply  and  manufacturing  relationships  with  third  parties  that  can  provide  adequate  supplies  of  products  that  are
compliant with good manufacturing practices, or GMPs, to support the clinical development and the market demand for Auryxia, vadadustat, if
approved, and any other product and product candidate, including those that may be in-licensed or acquired;
current and future restrictions or limitations on our approved or future indications and patient populations or other adverse regulatory actions or in
the  event  that  the  FDA  requires  Risk  Evaluation  and  Mitigation  Strategies,  or  REMS,  or  risk  management  plans  that  use  restrictive  risk
minimization strategies;
the effectiveness of our sales, marketing, manufacturing and distribution strategies and operations;
competing effectively with any products for the same or similar indications as our products;

•
•
• maintaining, protecting and expanding our portfolio of intellectual property rights, including patents and trade secrets; and
•

the impact of the COVID-19 pandemic on the above factors, including the disproportionate impact of the COVID-19 pandemic on CKD patients,
the adverse impact on the phosphate binder market in which we compete, and the limitation of our sales professionals to meet in person with
healthcare professionals as the result of travel restrictions or limitations on access for non-patients.

Our ability to achieve profitability also depends on our ability to manage our expenses. Following receipt of the CRL, in April and May 2022, we
implemented a reduction of our workforce, by approximately 42% across all areas of the Company (47% inclusive of the closing of the majority of open
positions), including several members of management. In November 2022, we also implemented a reduction of our workforce, by approximately 14%
consisting of individuals within our commercial organization as a result of our decision to shift to a strategic account management focused model for our
commercial efforts. We recorded a restructuring charge of $15.9 million in the aggregate primarily related to contractual termination benefits including
severance, non-cash stock-based compensation expense, healthcare and related benefits in the year ended December 31, 2022. However, we may incur
additional costs not currently contemplated due to events associated with or resulting from the workforce reductions. Additionally, the reductions in
workforce could impact our operations, including our commercialization of Auryxia, which could affect our ability to generate revenue.

We expect to continue to incur additional operating expenses, including additional research and development expenses to our pipeline, additional costs
related to vadadustat, and research and development and selling, general and administrative expenses for ongoing development and commercialization of
Auryxia, which could lead to operating losses for the foreseeable future. In addition to any additional costs not currently contemplated due to events
associated with or resulting from the workforce reductions noted above, our ability to achieve profitability and our financial position will depend, in part,
on the rate of our future expenditures, on product revenue, collaboration revenue, and our ability to obtain additional funding. On June 30, 2022, we entered
into a Termination and Settlement Agreement, or the Termination Agreement, with Otsuka Pharmaceutical Co. Ltd., or Otsuka, pursuant to which we
agreed to the immediate termination of the December 18, 2016 collaboration and license agreement with Otsuka, or the Otsuka U.S. Agreement, and the
April 25, 2017 collaboration and license agreement with Otsuka, or the Otsuka International Agreement, in exchange for the payment of $55.0 million to us
and the agreement between the parties with respect to the conduct of certain activities. Unless and until we are able to find a new partner for vadadustat in
Europe and other countries previously licensed to Otsuka, we will incur additional expenses in connection with the development of vadadustat and will
receive less collaboration revenue and, if approved, product revenue than originally anticipated. In addition, we expect to continue to incur significant
expenses if and as we:

•

•

•

continue our commercialization activities for Auryxia and vadadustat, if we are able to obtain marketing approval for vadadustat following receipt
of the CRL from the FDA in March 2022, and any other product or product candidate, including those that may be in-licensed or acquired;
address the issues identified in the CRL for vadadustat that we received from the FDA and pursue our appeal of the CRL for vadadustat with the
FDA;
conduct and enroll patients in any clinical trials, including post-marketing studies or any other clinical trials for Auryxia, vadadustat or any other
product or product candidate, including those that may be in-licensed or acquired;
seek marketing approvals for vadadustat and any other product candidate, including those that may be in-licensed or acquired;

•
• maintain marketing approvals for Auryxia and vadadustat, if we are able to obtain marketing approval for vadadustat following receipt of the CRL

from the FDA in March 2022, and any other product, including those that may be in-licensed or acquired;

• manufacture Auryxia, vadadustat and any other product or product candidate, including those that may be in-licensed or acquired, for commercial

•

•

sale and clinical trials;
conduct discovery and development activities for additional product candidates or platforms that may lead to the discovery of additional product
candidates;
engage in transactions, including strategic, merger, collaboration, acquisition and licensing transactions, pursuant to which we would market and
develop commercial products, or develop and commercialize other product candidates and technologies;

48

•

continue to repay, and pay any associated pre-payment penalties, if applicable, the senior secured term loans in an aggregate principal amount of
$67.0 million as of December 31, 2022, or the Term Loans, that were made available to us pursuant to the Loan Agreement;

• make royalty, milestone or other payments under our license agreements and any future license agreements;
• maintain, protect and expand our intellectual property portfolio;
• make decisions with respect to our personnel, including the retention of key employees;
• make decisions with respect to our infrastructure, including to support our operations as a fully integrated, publicly traded biopharmaceutical

company; and
experience any additional delays or encounter issues with any of the above.

•

We have and will continue to expend significant resources on our legal proceedings, as described below under Part I, Item 3. Legal Proceedings, or any
other legal proceedings brought by or against us in the future.

Because of the numerous risks and uncertainties associated with pharmaceutical product development and commercialization, we are unable to accurately
predict the timing or amount of increased expenses. The net losses we incur may fluctuate significantly from quarter to quarter and year to year, such that a
period-to-period comparison of our results of operations may not be a good indication of our future performance. In any particular quarter, the progress of
our clinical development and our operating results could be below the expectations of securities analysts or investors, which could cause our stock price to
decline.

We will continue to incur substantial expenditures relating to continued commercialization and post-marketing requirements for Auryxia and vadadustat, if
we are able to obtain marketing approval for vadadustat following receipt of the CRL from the FDA in March 2022, and any other products, including
those that may be in-licensed or acquired, as well as costs relating to the research and development of any other product candidate, including those that may
be in-licensed or acquired. Our prior losses and expected future losses have had and will continue to have an adverse effect on our stockholders’ equity and
working capital.

Our expenses could increase beyond expectations if we are required by the FDA, the European Medicines Agency, or the EMA, or other regulatory
authorities, or if we otherwise believe it is necessary, to change our manufacturing processes or assays, to amend or replace our study protocols, to conduct
any additional clinical trials, whether in order to obtain approval or as a post-approval study, including any additional clinical trial that we decide to
conduct for vadadustat, to perform studies in addition to, different from or larger than those currently planned, if there are any delays in completing our
clinical trials or if there are further delays in or issues with obtaining marketing approval for vadadustat in the United States, the European Union, or EU, or
other jurisdictions. In addition, our ability to generate revenue would be negatively affected if the size of our addressable patient population is not as
significant as we estimate, the indication approved by regulatory authorities is narrower than we sought or the patient population for treatment is narrowed
by competition, physician choice, coverage or reimbursement, or payor or treatment guidelines. Even though we generate product revenue from Auryxia
and royalties from Riona
future, including those that may be in-licensed or acquired, we may never generate revenue and royalties that are significant enough for us to become and
remain profitable, and we will need to obtain additional funding to continue to fund our operating plan beyond Auryxia and certain development activities,
and achieve strategic growth.

 and Vafseo  in Japan and may generate revenue and royalties from the sale of any products that may be approved in the

TM

TM

We will require substantial additional financing to achieve our goals. A failure to obtain this necessary capital when needed, or on acceptable terms,
could force us to delay, limit, reduce or terminate our product development or commercialization efforts.

As of December 31, 2022, our cash and cash equivalents were $90.5 million. We expect to continue to expend substantial amounts of cash for the
foreseeable future as we continue to commercialize Auryxia; pursue our appeal for vadadustat in the U.S. with the FDA; support the regulatory process
with respect to vadadustat with the EMA and ACCESS Consortium; and develop and commercialize any other product or product candidate, including
those that may be in-licensed or acquired. These expenditures will include costs associated with research and development, manufacturing, potentially
obtaining marketing approvals and marketing products approved for sale. In addition, other unanticipated costs may arise. Because the outcomes of our
current and anticipated clinical trials are highly uncertain, we cannot reasonably estimate the actual amount of funding necessary to successfully complete
clinical development for any current or future product candidates, including vadadustat depending on what is required to address the issues identified in the
CRL for vadadustat, including the outcome of our appeal and if additional clinical trials are required in order to obtain marketing approval, or to complete
post-marketing studies for Auryxia and vadadustat, if approved. Our future capital requirements depend on many factors, including:

•

the scope, progress, results and costs of conducting clinical trials or any post-marketing requirements or any other clinical trials for Auryxia,
vadadustat and any other product or product candidate, including those that may be in-licensed or acquired;

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•

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•

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the cost and timing of commercialization activities, including product manufacturing, marketing, sales and distribution costs, for Auryxia,
vadadustat, if approved, and any other product or product candidate, including those that may be in-licensed or acquired;
the results of our meetings with the FDA, the EMA and other regulatory authorities and any consequential effects, including on timing of and
ability to obtain and maintain marketing approval, study design, study size and resulting operating costs;
any difficulties or delays in conducting our clinical trials, or enrolling patients in our clinical trials, for Auryxia, vadadustat or any other product
candidates;
the outcome of our efforts to obtain marketing approval for vadadustat in the United States, Europe and in other jurisdictions and any other
product candidates, including those that may be in-licensed or acquired, including any additional clinical trials or post-approval commitments
imposed by regulatory authorities;
the timing of, and the costs involved in obtaining, marketing approvals for vadadustat, including in the United States, Europe and certain other
markets, and any other product candidate, including those that may be in-licensed or acquired, including to fund the preparation, filing and
prosecution of regulatory submissions;
the costs of maintaining marketing approvals for Auryxia or any other product, including those that may be in-licensed or acquired;
the number of generic versions of Auryxia that enter the market following loss of exclusivity for Auryxia in March 2025, and the timing of, and
the magnitude of, the impact on the price of Auryxia;
the cost of securing and validating commercial manufacturing for any of our product candidates, including those that may be in-licensed or
acquired, and maintaining our manufacturing arrangements for Auryxia and vadadustat or any other product, including those that may be in-
licensed or acquired, or securing and validating additional arrangements;
the costs involved in preparing, filing and prosecuting patent applications and maintaining, defending and enforcing our intellectual property
rights, including litigation costs, and the outcome of such litigation;
the costs involved in any legal proceedings to which we are a party;
our status as a publicly traded company on the Nasdaq Capital Market;
our decisions with respect to personnel;
our decisions with respect to infrastructure; and
the extent to which we engage in transactions, including strategic, merger, collaboration, acquisition and licensing transactions, pursuant to which
we could develop and market commercial products, or develop other product candidates and technologies.

We will need to obtain substantial additional funding to fund our operating plan beyond Auryxia and certain development activities, and achieve strategic
growth. If we are unable to raise capital when needed or on attractive terms, we could be forced to delay, reduce or eliminate our research and development
programs or any future commercialization efforts.

We expect our cash resources to fund our current operating plan through at least the next twelve months from the filing of this Annual Report on Form 10-
K. However, if our operating performance deteriorates significantly from the levels achieved in 2022, it could have an effect on our liquidity and our ability
to continue as a going concern in the future. Our forecast of the period of time through which our financial resources will be adequate to support our
operations is a forward-looking statement and involves numerous risks and uncertainties, and actual results could vary as a result of a number of factors,
many of which are outside our control. We have based this estimate on assumptions that may be substantially different than actual results, and we could
utilize our available capital resources sooner than we currently expect. In addition, if we fail to satisfy any of the covenants under our Loan Agreement with
Pharmakon, including the covenant that our Annual Report on Form 10-K for the fiscal year ending December 31, 2023 not be qualified as to going
concern, and the loan is accelerated, we may not have sufficient resources to fund our operating plan through the next twelve months. There can be no
assurance that the current operating plan will be achieved in the time frame anticipated by us, or that our cash resources will fund our operating plan for the
period anticipated by us, or that additional funding will be available on terms acceptable to us, or at all.

Any additional fundraising efforts may divert our management’s attention away from their day-to-day activities, which may adversely affect our ability to
develop and commercialize Auryxia and any other products or product candidates, including those that may be in-licensed or acquired, or to continue to
seek regulatory approval for vadadustat. Also, additional funds may not be available to us in sufficient amounts or on acceptable terms or at all. If we are
unable to raise additional capital in sufficient amounts when needed or on terms acceptable to us, we may have to significantly delay, scale back or
discontinue the development and/or commercialization of Auryxia and any other products or product candidates, including those that may be in-licensed or
acquired, or to take any actions with respect to vadadustat depending on future decisions with respect to vadadustat in the U.S. Any of these events could
significantly harm our business, financial condition and prospects.

Raising additional capital may cause dilution to our existing stockholders, restrict our operations or require us to relinquish rights to our product and
product candidates on unfavorable terms to us.

We expect to finance future cash needs through product revenue, royalty transactions, strategic transactions, public or private equity or debt transactions, or
a combination of these approaches. To the extent that we raise additional capital through the sale of equity or convertible debt securities, the ownership
interests of our common stockholders will be diluted, our fixed payment

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obligations may increase, any such securities may have rights senior to those of our common stock, and the terms may include liquidation or other
preferences and anti-dilution protections that adversely affect the rights of our common stockholders. Additional debt financing, if available, may involve
agreements that would restrict our operations and potentially impair our competitiveness, such as limitations on our ability to incur additional debt, make
capital expenditures, declare dividends, acquire, sell or license intellectual property rights, and other operating restrictions that could adversely impact our
ability to conduct our business. If we raise additional funds through royalty transactions, we may have to relinquish valuable rights to our portfolio and
future revenue streams, and enter into agreements that would restrict our operations and strategic flexibility. If we raise additional funds through strategic
transactions with third parties, we may have to do so at an earlier stage than otherwise would be desirable. In connection with any such strategic
transactions, we may be required to relinquish valuable rights to our product and product candidates, future revenue streams or research programs or grant
licenses on terms that are not favorable to us. If we are unable to raise additional funds when needed, we may not be able to pursue planned development
and commercialization activities and we may need to grant rights to develop and market product candidates that we would otherwise prefer to develop and
market ourselves.

If we fail to regain compliance with the continued listing requirements of Nasdaq, our common stock may be delisted and the price of our common
stock and our ability to access the capital markets could be negatively impacted.

On May 12, 2022, we received a deficiency letter from the Listing Qualifications Department of the Nasdaq Stock Market, or Nasdaq, notifying us that, for
the last 30 consecutive business days, the bid price for our common stock had closed below the minimum $1.00 per share requirement for continued
inclusion on the Nasdaq Global Market, referred to as the minimum bid price rule. In accordance with Nasdaq Listing Rules, we were provided an initial
period of 180 calendar days, or until November 8, 2022, to regain compliance with the minimum bid price rule. We did not regain compliance with the
minimum bid price rule by the initial compliance date.

On November 9, 2022, Nasdaq notified us that we were eligible for an additional 180 calendar day period, or until May 8, 2023, to regain compliance with
the minimum bid price rule. Nasdaq’s determination was based on our meeting the continued listing requirement for market value of publicly held shares
and all other applicable requirements for initial listing on the Nasdaq Capital Market with the exception of bid price requirement, and our written notice of
our intention to cure the deficiency during the second compliance period by effecting a reverse stock split, if necessary. On November 9, 2022, Nasdaq
approved our transfer from the Nasdaq Global Market to the Nasdaq Capital Market, a continuous trading market that operates in substantially the same
manner as the Nasdaq Global Market. The transfer became effective at the opening of business on November 11, 2022.

To date, we have not regained compliance with the minimum bid price rule. If, at any time during the additional compliance period the bid price for our
common stock closes at $1.00 or more per share for a minimum of 10 consecutive business days, the Nasdaq Listing Qualifications Department staff will
provide written notification to us that we are in compliance with the minimum bid price rule, unless the staff exercises its discretion to extend this 10-day
period pursuant to the Nasdaq Listing Rules.

If we do not regain compliance with the minimum bid price rule by the required date and we are not eligible for any additional compliance period at that
time, the Nasdaq Listing Qualifications Department staff will provide us written notification that our common stock may be delisted. At that time, we may
appeal the staff’s delisting determination to a Nasdaq Listing Qualifications Panel. We expect that our common stock would remain listed pending the
panel’s decision. However, there can be no assurance that, even if we appeal the staff’s delisting determination to the Nasdaq Listing Qualifications Panel,
such appeal would be successful.

On March 1, 2023, we filed a definitive proxy statement for a Special Meeting of Stockholders to be held on April 11, 2023 at which meeting we are
seeking stockholder approval of a reverse stock split with the primary intent of increasing the price of our common stock to meet the price criteria for
continued listing on Nasdaq. We intend to continue to monitor the closing bid price of our common stock and may, if appropriate, consider available
options to regain compliance with the minimum bid price rule, which could include seeking to effect a reverse stock split. However, there can be no
assurance that our stockholders will approve a reverse stock split or that we will be able to regain compliance with the minimum bid price rule.

There are many factors that may adversely affect our minimum bid price, including those described throughout this section titled “Risk Factors.” Many of
these factors are outside of our control. As a result, we may not be able to sustain compliance with the minimum bid price rule in the long term. Any
potential delisting of our common stock from the Nasdaq Capital Market would likely result in decreased liquidity and increased volatility for our common
stock and would adversely affect our ability to raise additional capital or to enter into strategic transactions. Any potential delisting of our common stock
from the Nasdaq Capital Market would also make it more difficult for our stockholders to sell our common stock in the public market.

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We may not be successful in our efforts to identify, acquire, in-license, discover, develop and commercialize additional products or product candidates
or our decisions to prioritize the development of certain product candidates over others may not be successful, which could impair our ability to grow.

Although we continue to focus a substantial amount of our efforts on the commercialization of Auryxia and to pursue our appeal for vadadustat in the U.S.
with the FDA and to seek regulatory approval for vadadustat in Europe and other territories, a key element of our long-term growth strategy is to develop
additional product candidates and acquire, in-license, develop and/or market additional products and product candidates.

Research programs to identify product candidates require substantial technical, financial and human resources, regardless of whether product candidates are
ultimately identified. Our research and development programs may initially show promise, yet fail to yield product candidates for clinical development or
commercialization for many reasons, including the following:

the research methodology used may not be successful in identifying potential indications and/or product candidates;
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• we may not be able or willing to assemble sufficient resources to acquire or discover additional product candidates;
•

a product candidate may be shown to have harmful side effects, a lack of efficacy or other characteristics that indicate that they are unlikely to be
drugs that will receive marketing approval and/or achieve market acceptance;
a product candidate we develop and seek regulatory approval for, including vadadustat, may not be approved by the FDA on a timely basis, or at
all;
product candidates we develop may nevertheless be covered by third party patents or other exclusive rights;
the market for a product candidate may change during our program so that the continued development of that product candidate is no longer
commercially reasonable;
a product candidate may not be capable of being produced in commercial quantities at an acceptable cost, or at all; or
a product candidate may not be accepted as safe and effective by patients, the medical community, or third party payors, if applicable.

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If any of these events occur, we may be forced to abandon our research and development efforts for one or more of our programs, or we may not be able to
identify, discover, develop or commercialize additional product candidates, which may have a material adverse effect on our business.

Because we have limited financial and managerial resources, especially as a result of the CRL for vadadustat that we received in March 2022 and the
reductions in workforce that we implemented in 2022, we focus on products, research programs and product candidates for specific indications. As a result,
we may forgo or delay pursuit of opportunities with other product candidates or for other indications, or out license rights to product candidates, that later
prove to have greater commercial potential. For example, as a result of receipt of the CRL and implementation of the reductions in workforce, we delayed
certain research activities. Our resource allocation decisions may cause us to fail to capitalize on viable commercial products or profitable market
opportunities on a timely basis, or at all. Our spending on current and future research and development programs and product candidates for specific
indications may not yield any commercially viable products.

Because our internal research capabilities are limited, we may be dependent upon other pharmaceutical and biotechnology companies, academic scientists
and institutions, and other researchers to sell or license product candidates, products or technology to us. The success of this strategy depends partly upon
our ability to identify, select, and acquire promising product candidates and products. The process of identifying, selecting, negotiating and implementing a
license or acquisition of a product candidate or an approved product is lengthy and complex. Other companies, including some with substantially greater
financial, marketing and sales resources, may compete with us for the license or acquisition of a product candidate or an approved product. We have limited
resources to identify and execute the acquisition or in-licensing of third party products, businesses, and technologies and integrate them into our current
infrastructure.

Moreover, we may devote resources to potential acquisitions or in-licensing opportunities that are never completed, or we may fail to realize the anticipated
benefits of such efforts. Any product candidate that we acquire may require additional development efforts prior to commercial sale, including extensive
clinical testing and approval by the FDA, the EMA, the Japanese Pharmaceuticals and Medical Devices Agency, or PMDA, or other regulatory authorities,
or post-approval testing or other requirements if approved. All product candidates are prone to risks of failure typical of pharmaceutical product
development, including the possibility that a product candidate will not be shown to be sufficiently safe and effective for approval by regulatory authorities.
In addition, we cannot provide assurance that any of our products will be manufactured in a cost effective manner, achieve market acceptance or not require
substantial post-marketing clinical trials.

Accordingly, there can be no assurance that we will ever be able to identify, acquire, in-license or develop suitable additional products or product
candidates, which could materially adversely affect our future growth and prospects. We may focus our efforts and resources on potential products, product
candidates or other programs that ultimately prove to be unsuccessful.

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We may engage in strategic transactions to acquire assets, businesses, or rights to products, product candidates or technologies or form collaborations
or make investments in other companies or technologies that could harm our operating results, dilute our stockholders’ ownership, increase our debt,
or cause us to incur significant expense.

As part of our business strategy, we may engage in additional strategic transactions to expand and diversify our portfolio, including through the merger,
acquisition or in-license of assets, businesses, or rights to products, product candidates or technologies or through strategic alliances or collaborations,
similar to the Merger and our existing and prior collaboration and license arrangements. We may not identify suitable strategic transactions, or complete
such transactions in a timely manner, on favorable terms, on a cost-effective basis, or at all. Moreover, we may devote resources to potential opportunities
that are never completed or we may incorrectly judge the value or worth of such opportunities. Even if we successfully execute a strategic transaction, we
may not be able to realize the anticipated benefits of such transaction and may experience losses related to our investments in such transactions. Integration
of an acquired company or assets into our existing business may not be successful and may disrupt ongoing operations, require the hiring of additional
personnel and the implementation and integration of additional internal systems and infrastructure, and require management resources that would otherwise
focus on developing our existing business. Even if we are able to achieve the long-term benefits of a strategic transaction, our expenses and short-term
costs may increase materially and adversely affect our liquidity. Any of the foregoing could have a detrimental effect on our business, results of operations
and financial condition. For example, on June 4, 2021, we entered into a license agreement, the Cyclerion Agreement, with Cyclerion Therapeutics Inc., or
Cyclerion, pursuant to which Cyclerion granted us an exclusive global license under certain intellectual property rights to research, develop and
commercialize praliciguat, an investigational oral soluble guanylate cyclase, or sGC, stimulator. Although we have progressed preclinical studies for
praliciguat, we need to do additional work to manufacture product for clinical trials before we can initiate the trials, and when started, we may be
unsuccessful in developing praliciguat. If any of the assumptions that we made in valuing the transaction, including the costs or timing of development of,
or the potential benefits of, praliciguat, were incorrect, we may not recognize the anticipated benefits of the transaction and our business could be harmed.

In addition, future transactions may entail numerous operational, financial and legal risks, including:

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incurring substantial debt, dilutive issuances of securities or depletion of cash to pay for acquisitions;
exposure to known and unknown liabilities, including contingent liabilities, possible intellectual property infringement claims, violations of laws,
tax liabilities and commercial disputes;
higher than expected acquisition and integration costs;
difficulty in integrating operations, processes, systems and personnel of any acquired business;
increased amortization expenses or, in the case of a write-down of the value of acquired assets, impairment losses, such as the Auryxia intangible
asset impairment in the second quarter of 2020 and corresponding adjustments to the estimated useful life of the developed product rights for
Auryxia;
impairment of relationships with key suppliers or customers of any acquired business due to changes in management and ownership;
inability to retain personnel, customers, distributors, vendors and other business partners integral to an in-licensed or acquired product, product
candidate or technology;
potential failure of the due diligence processes to identify significant problems, liabilities or other shortcomings or challenges;
entry into indications or markets in which we have no or limited development or commercial experience and where competitors in such markets
have stronger market positions; and
other challenges associated with managing an increasingly diversified business.

If we are unable to successfully manage any transaction in which we may engage, our ability to develop new products and continue to expand and diversify
our portfolio may be limited.

Our business has been and may continue to be, directly or indirectly, adversely affected by the COVID-19 pandemic.

The COVID-19 pandemic has presented a substantial public health and economic challenge around the world and continues to affect our patients,
healthcare providers with whom we interact, customers, our contract manufacturing organizations, or CMOs, and other vendors. The full extent to which
the COVID-19 pandemic and the lasting effects of the pandemic will directly or indirectly impact our business, results of operations and financial condition
continues to depend on future developments that are highly uncertain and cannot be accurately predicted, including any resurgences or variants of COVID-
19, the actions taken to contain it or treat its impact and the economic and other impacts on local, regional, national and international markets where the
healthcare providers with whom we interact, our CMOs, and our other vendors operate. On January 30, 2023, the Biden Administration announced that it
will end the public health emergency declarations related to

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COVID-19 on May 11, 2023. On January 31, 2023, the FDA indicated that it would soon issue a Federal Register notice describing how the termination of
the public health emergency will impact the agency’s COVID-19 related guidance, including the clinical trial guidance and updates thereto. At this point, it
is unclear how, if at all, these developments will impact our efforts to develop and commercialize our product candidates.

We believe our revenue growth was negatively impacted by the COVID-19 pandemic in 2021 and 2022 primarily as the CKD patient populations that we
serve experienced both high hospitalization and mortality rates due to COVID-19, and the pandemic had an adverse impact on the phosphate binder market
in which Auryxia competes. Labor shortages and costs have adversely impacted dialysis providers. These impacts have refocused clinical efforts in
addressing bone and mineral disorders like hyperphosphatemia to more acute operational issues to ensure patients receive dialysis treatments and still some
patients have been rescheduled or missed treatments due to labor shortages. We believe, this and potentially other factors, has led to the reduction in the
phosphate binder market, which has not experienced growth since early 2020. While we are unable to quantify the impact of the COVID-19 pandemic on
future revenues and revenue growth, the COVID-19 pandemic and the ongoing impacts from the COVID-19 pandemic continue to adversely and
disproportionately impact CKD patients and the phosphate binder market; therefore, we expect the ongoing impacts from the pandemic to continue to have
a negative impact on our revenue growth for the foreseeable future.

In addition, several healthcare facilities have previously restricted access for non-patients, including the members of our sales force. For example, DaVita,
Inc., or DaVita, and Fresenius Medical Care, or Fresenius, which account for a vast majority of the dialysis population in the United States, have previously
restricted access to their clinics. As a result, we continue to engage with some healthcare providers and other customers virtually, where possible. The
restrictions on our customer-facing employees’ in-person interactions with healthcare providers have, and could continue to, negatively impact our access
to healthcare providers and, ultimately, our sales, including with respect to vadadustat, if approved. Recently, such precautionary measures have been
relaxed at certain healthcare facilities and, as a result, members of our sales force have resumed in person interactions with certain customers. Nevertheless,
some restrictions remain, and more restrictions may be put in place again due to a resurgence in COVID-19 cases, including those involving new variants
of COVID-19, which may be more contagious and more severe than prior strains of the virus. Given this uncertain environment and the disproportionate
impact of the COVID-19 pandemic on CKD patients, we are actively monitoring the demand in the United States for Auryxia and will be for vadadustat, if
approved, including the potential for further declines or changes in prescription trends and customer orders, which could have a material adverse effect on
our business, results of operations, and financial condition.

In addition, the direct and indirect impacts of the pandemic or the response efforts to the pandemic, including, among others, competition for labor and
resources and increases in labor, sourcing, manufacturing and shipping costs, may cause disruptions to, closures of or other impacts on our CMOs and other
vendors in our supply chain on which we rely for the supply of our products and product candidates. For example, areas of China have recently continued
to implement lockdowns for COVID-19, which could impact the global supply chain. At this time, our CMOs continue to operate at or near normal levels.
However, it is possible that the COVID-19 pandemic and response efforts may have an impact in the future on our contract manufacturers’ ability to
manufacture and deliver Auryxia and vadadustat (if approved in the United States or EMA and which is currently marketed under the trade name Vafseo
by MTPC in Japan), which may result in increased costs and delays, or disruptions to the manufacturing and supply of our products. These impacts could
have a negative effect on our inventory reserves, which could result in an increase in inventory write-offs due to expiry.

TM

If we or any of the third parties with whom we engage, including our collaboration partners, vendors, or any of our customers were to experience further
shutdowns, delays or other business disruptions, our ability to conduct our business in the manner and on the timelines presently planned, and our revenue
expectations, could be materially and negatively impacted, which could have a material adverse effect on our business and our financial results.

While we are working to mitigate the impacts on our business, we are mindful that many of these risks and the impact to the larger healthcare market are
outside of our control. The COVID-19 pandemic has, and may continue to, significantly impact the phosphate binder market in which we compete and
economies and financial markets worldwide, which could result in adverse effects on our business and operations, impact our ability to raise additional
funds and impact the volatility of our stock price and trading in our stock. Even after the COVID-19 pandemic has been contained or mitigated, we may
continue to experience adverse impacts to our business as a result of the adverse impact on the patient population for Auryxia, the decline in the phosphate
binder market and any economic recession or depression that has occurred or may occur in the future.

Risks Related to our Financial Arrangements

Our obligations in connection with the loan agreement with Pharmakon and requirements and restrictions in the loan agreement could adversely affect
our financial condition and restrict our operations.

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We entered into the Loan Agreement with Pharmakon, pursuant to which the Term Loans were made available to us in two tranches. The first tranche of
$80.0 million closed on November 25, 2019, and the second tranche of $20.0 million closed on December 10, 2020. See Note 11 to our audited
consolidated financial statements in Part II, Item 8. Financial Statements of this Annual Report on Form 10-K for additional information regarding our
obligations under the Loan Agreement.

The Loan Agreement contains affirmative and negative covenants applicable to us and our subsidiaries, including maintaining, on an annual basis, a
minimum liquidity threshold, which started in 2021, and on a quarterly basis, a minimum net sales threshold for Auryxia, which started in the fourth
quarter of 2020. In addition, the Loan Agreement contains covenants that our Annual Reports on Form 10-K, must not be subject to any qualification as to
going concern. Failure to maintain compliance with these or other covenants would result in an event of default under the Loan Agreement, which could
result in enforcement action, including acceleration of amounts due under the Loan Agreement. Additionally, the liabilities under the Loan Agreement will
be accelerated, subject to certain exceptions, if we are required to repay to CSL Vifor all or a part of the working capital facility established in connection
with the Second Amended and Restated License Agreement that we entered into with CSL Vifor, in February 2022, or the Vifor Second Amended
Agreement, as a result of certain terminations of the Vifor Second Amended Agreement or due to a reduction in the balance of the working capital facility
by more than a prespecified amount.

In the event there is an acceleration of our and certain of our subsidiaries’ liabilities under the Loan Agreement as a result of an event of default or
otherwise, we may not have sufficient funds or may be unable to arrange for additional financing to repay the liabilities or to make any accelerated
payments, and Pharmakon could seek to enforce security interests in the collateral securing the Loan Agreement and our guarantee of the Term Loans,
which would have a material adverse effect on our business, financial condition and results of operations.

The Loan Agreement permits voluntary prepayment at any time in whole or in part, subject to prepayment premiums and make-whole premiums prior to
certain dates. We made a voluntary prepayment of $25.0 million, including $0.5 million of prepayment penalties on July 15, 2022, pursuant to the Second
Amendment and Waiver. This represented the repayment of $5.0 million of the first tranche and the full $20.0 million of the second tranche. Upon a change
of control, mandatory prepayment provisions require us to prepay the principal amount outstanding, the applicable prepayment premium and make-whole
premium and accrued and unpaid interest. In addition, our obligations in connection with the Loan Agreement could have additional significant adverse
consequences, including, among other things:

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•

restricting our activities, including limitations on transferring certain of our assets, engaging in certain transactions, terminating certain
agreements, including the Vifor Second Amended Agreement, incurring certain additional indebtedness, creating certain liens, paying dividends or
making certain other distributions and investments;
limiting our flexibility in planning for, or reacting to, changes in our business and our industry;
placing us at a possible competitive disadvantage compared to our competitors who have a smaller amount of debt or competitors with comparable
debt at more favorable interest rates; and
limiting our ability to borrow additional amounts for working capital, capital expenditures, research and development efforts, acquisitions, debt
service requirements, execution of our business strategy and other purposes.

Any of these factors could materially and adversely affect our business, financial condition and results of operations.

Our Royalty Interest Acquisition Agreement with HealthCare Royalty Partners IV, L.P. contains various covenants and other provisions, which, if
violated, could materially adversely affect our financial condition.

On February 25, 2021, we entered into a royalty interest acquisition agreement, or the Royalty Agreement, with HealthCare Royalty Partners IV, L.P., or
HCR, pursuant to which we sold to HCR our right to the to receive royalties and sales milestones for vadadustat, collectively the Royalty Interest
Payments, in each case, payable to us under our Collaboration Agreement dated December 11, 2015, or the MTPC Agreement, with Mitsubishi Tanabe
Pharma Corporation, or MTPC, subject to an annual maximum “cap” of $13.0 million, or the Annual Cap, and an aggregate maximum “cap” of $150.0
million, or the Aggregate Cap. Under the Royalty Agreement, we are required to comply with various covenants, including obligations to take certain
actions, such as actions with respect to the Royalty Interest Payments, the MTPC Agreement, our agreement with MTPC for the commercial supply of
vadadustat drug product, and our intellectual property. In addition, the Royalty Agreement includes customary events of default upon the occurrence of
enumerated events, including failure to perform certain covenants and the occurrence of insolvency events. In the event we violate certain covenants and
other provisions, we may not receive sales milestones from HCR even if the applicable sales thresholds are met. Upon the occurrence of an event of
default, HCR would have the ability to exercise all available remedies in law and equity, which could have a material adverse effect on our financial
condition.

Risks Related to Commercialization

55

Our business is substantially dependent on the commercial success of Auryxia. If we are unable to continue to successfully commercialize Auryxia, our
results or operations and financial condition will be materially harmed.

Our business and our ability to generate product revenue largely depend on our, and our collaborators’, ability to successfully commercialize Auryxia. Our
ability to generate revenue depends on our ability to execute on our commercialization plans, and the size of the market for, and the level of market
acceptance of, Auryxia and any other product or product candidate, including those that may be in-licensed or acquired. If the size of any market for which
a product or product candidate is approved decreases or is smaller than we anticipate, our revenue and results of operations could be materially adversely
affected. For example, the phosphate binder market has declined since 2020, which we believe was partially a result of the COVID-19 pandemic. If the
phosphate market does not recover or continues to decline, our revenue from Auryxia could be materially adversely affected.

Market acceptance is also critical to our ability to generate significant product revenue. Any product may achieve only limited market acceptance or none at
all. If Auryxia, or any of our product candidates that is approved, is not accepted by the market to the extent that we expect or market acceptance decreases,
we may not be able to generate significant product revenue and our business would be materially harmed. Market acceptance of Auryxia or any other
approved product depends on a number of factors, including:

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•
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the availability of adequate coverage and reimbursement by and the availability of discounts, rebates and price concessions from third party
payors, pharmacy benefit managers, or PBMs, and governmental authorities;
the safety and efficacy of the product, as demonstrated in clinical trials and in the post-marketing setting;
the prevalence and complications of the disease treated by the product;
the clinical indications for which the product is approved and the product label approved by regulatory authorities, including any warnings or
limitations that may be required on the label as a consequence of potential safety risks associated with the product;
the countries in which marketing approvals are obtained;
the claims we and our collaborators are able to make regarding the safety and efficacy of the product;
the success of our physician and patient communications and education programs;
acceptance by physicians and patients of the product as a safe and effective treatment and the willingness of the target patient population to try
new therapies and of physicians to prescribe new therapies;
the cost, safety and efficacy of the product in relation to alternative treatments;
the timing of receipt of marketing approvals and product launch relative to competing products and potential generic entrants;
relative convenience and ease of administration;
the frequency and severity of adverse side effects;
favorable or adverse publicity about our products or favorable or adverse publicity about competing products;
the effectiveness of our and our collaborators’ sales, marketing and distribution efforts; and
the restrictions on the use of the product together with other medications, if any.

If we are unable to maintain or expand, or, if vadadustat is approved, initiate, sales and marketing capabilities or enter into additional agreements with
third parties, we may not be successful in commercializing Auryxia, vadadustat, if approved, or any other product candidates that may be approved.

In order to market Auryxia and any other approved product, we intend to continue to invest in sales and marketing, which will require substantial effort and
significant management and financial resources. We have built a commercial infrastructure and sales force in the United States for Auryxia, our only
commercial product. However, following receipt of the CRL, in April and May 2022, we implemented a reduction of our workforce by approximately 42%
across all areas of the Company (47% inclusive of the closing of the majority of open positions), including several members of management. In November
2022, we also implemented a reduction of our workforce, by approximately 14% consisting of individuals within our commercial organization as a result of
our decision to shift to a strategic account management focused model for our commercial efforts. If the remaining sales and marketing team cannot
successfully commercialize Auryxia, or if additional sales and marketing employees decide to leave as a result of the reduction in workforce or otherwise,
it could have a material adverse effect on Auryxia revenue and our financial condition.

If we obtain regulatory approval to market vadadustat in the U.S., we believe that we can leverage the current commercial foundation for vadadustat in the
U.S., but if we are unable to do so successfully this would materially harm our business. Additionally, training a sales force to successfully sell and market
a new commercial product is expensive and time-consuming

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and could delay any commercial launch of such product candidate or distract the sales force from promoting Auryxia. We may underestimate the size of the
sales force required for a successful product launch and we may need to expand our sales force earlier and at a higher cost than we anticipated. In 2021 and
early 2022, we incurred commercialization expenses for vadadustat that were premature or unnecessary as a result of the receipt of the CRL for vadadustat,
and may in the future incur additional commercialization expenses prematurely or unnecessarily if we do not receive marketing approval in the timeframe
we expect, or at all.

We devote significant effort, in particular, to recruiting individuals with experience in the sales and marketing of pharmaceutical products. Competition for
personnel with these skills is significant and retaining qualified personnel with experience in our industry is difficult. Further, our recent reductions in
workforce may further exacerbate these conditions and interfere with our ability to find and retain qualified personnel. As a result, we may not be able to
retain our existing employees or hire new employees quickly enough to meet our needs. At the same time, we may face high turnover, requiring us to
expend time and resources to source, train and integrate new employees.

There are risks involved with maintaining our own sales and marketing capabilities, including the following:

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•

•

potential inability to recruit, train and retain adequate numbers of effective sales and marketing personnel;
potential lack of complementary products to be offered by sales personnel, which may put us at a competitive disadvantage relative to companies
with more extensive product lines, especially as a result of the receipt of the CRL for vadadustat; and
costs and expenses associated with maintaining our own sales and marketing organization.

If we are unable to maintain our own sales and marketing capabilities, we will not be successful in commercializing Auryxia, vadadustat, if approved, and
any other product candidate that may be approved.

Furthermore, if we are unable to maintain our arrangements with third parties with respect to sales and marketing, if we are unsuccessful in entering into
additional arrangements with third parties to sell and market our products or we are unable to do so on terms that are favorable to us, or if such third parties
are unable to carry out their obligations under such arrangements, it will be difficult to successfully commercialize our product and product candidates,
including vadadustat, if approved. For example, if in connection with the Vifor Second Amended Agreement, we experience difficulties with CSL Vifor, or
if CSL Vifor experiences difficulties with other parties to whom it expects to sell vadadustat, if approved, our ability to commercialize vadadustat, if
approved, will be severely hindered and our business operations will be materially harmed.

Our, or our partners', failure to obtain or maintain adequate coverage, pricing and reimbursement for Auryxia, vadadustat, if approved, or any other
future approved products, could have a material adverse effect on our or our collaboration partners’ ability to sell such approved products profitably
and otherwise have a material adverse impact on our business.

Market acceptance and sales of any approved products, including Auryxia and, if approved, vadadustat, depends significantly on the availability of
adequate coverage and reimbursement from third party payors and may be affected by existing and future healthcare reform measures. Governmental
authorities, third party payors, and PBMs decide which drugs they will cover, as well as establish formularies or implement other mechanisms to manage
utilization of products and determine reimbursement levels. We cannot be sure that coverage or adequate reimbursement will be available for Auryxia,
vadadustat, if approved, or any of our potential future products. Even if we obtain coverage for an approved product, third party payors may not establish
adequate reimbursement amounts, which may reduce the demand for our product and prompt us to have to reduce pricing for the product. If reimbursement
is not available or is limited, we may not be able to commercialize certain of our products. Coverage and reimbursement by a governmental authority, third-
party payor or PBM may depend upon a number of factors, including the determination that use of a product is:

•
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•

a covered benefit under the health plan;
safe, effective and medically necessary;
appropriate for the specific patient; and
cost effective.

Obtaining coverage and reimbursement approval for a product from a governmental authority, PBM or a third-party payor is a time consuming and costly
process that could require us to provide supporting scientific, clinical and cost-effectiveness data for the use of our products to the payor. In the United
States, there are multiple governmental authorities, PBMs and third-party payors with varying coverage and reimbursement levels for pharmaceutical
products, and the timing of commencement of reimbursement by a governmental payor can be dependent on the assignment of codes via the Healthcare
Common Procedural Coding System, which codes are assigned on a quarterly basis. Within Medicare, for oral drugs dispensed by pharmacies and also
administered in facilities, coverage and reimbursement may vary depending on the setting. CMS, local Medicare

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administrative contractors, Medicare Part D plans and/or PBMs operating on behalf of Medicare Part D plans, may have some responsibility for
determining the medical necessity of such drugs, and therefore coverage, for different patients. Different reimbursement methodologies may apply, and
CMS may have some discretion in interpreting their application in certain settings.

As an oral drug, Auryxia is covered by Medicare under Part D. However, in September 2018, CMS decided that Auryxia would no longer be covered by
Medicare for the treatment of iron deficiency anemia, or IDA, in adult patients with NDD-CKD, or the CMS Decision. While this decision does not impact
CMS coverage for the control of serum phosphorus levels in adult patients with DD-CKD, or the Hyperphosphatemia Indication, it requires Part D plan
sponsors to impose prior authorization or other steps to ensure that Auryxia is reimbursed only for the Hyperphosphatemia Indication. While we believe
that the vast majority of the Medicare prescriptions written for Auryxia today are for the Hyperphosphatemia Indication and therefore will continue to be
covered by Medicare with prior authorization, the CMS Decision has had and will continue to have an adverse impact on the sales and future growth of
Auryxia for the Hyperphosphatemia Indication and the IDA Indication. For example, in the second quarter of 2020, we reduced our short-term and long-
term Auryxia revenue forecast, primarily driven by the compounding impact of the CMS Decision. As a result, we recorded an impairment charge of
$115.5 million to the Auryxia intangible asset associated with the developed product rights for Auryxia during the three months ended June 30, 2020.

Medicaid reimbursement of drugs varies by state. Private third-party payor reimbursement policies also vary and may or may not be consistent with
Medicare reimbursement methodologies. Manufacturers of outpatient prescription drugs may be required to provide discounts or rebates under government
healthcare programs or to certain third-party payors in order to obtain coverage of such products.

Additionally, we may be required to enter into contracts with third party payors and/or PBMs offering rebates or discounts on our products in order to
obtain favorable formulary status and we may not be able to agree upon commercially reasonable terms with such third party payors or PBMs, or provide
data sufficient to obtain favorable coverage and reimbursement for many reasons, including that we may be at a competitive disadvantage relative to
companies with more extensive product lines. In addition, third party payors, PBMs and other entities that purchase our products may impose restrictions
on our ability to raise prices for our products over time without incurring additional costs. Four distributors, Fresenius Medical Care Rx, McKesson
Corporation, Cardinal Health, Inc. and Amerisource Bergen Drug Corporation, in the aggregate, accounted for a significant percentage of our gross revenue
during 2022. If we are not able to maintain our arrangements with these key distributors on favorable terms, on a timely basis or at all, or if there is any
adverse change in one or more of these distributors’ business practices or financial condition, it would adversely impact the market opportunity for
Auryxia, our product revenues and operating results.

Furthermore, vadadustat was approved in Japan for the treatment of adult patients with anemia due to CKD and is being marketed by MTPC in Japan under
the trade name Vafseo . Pricing and reimbursement strategy is a key component of MTPC’s commercialization plans for Vafseo in Japan. If coverage and
reimbursement terms change, MTPC may not be able to, or may decide not to, continue commercialization of Vafseo in Japan.

TM

We currently believe it is likely that vadadustat, if approved, will be reimbursed using the Transitional Drug Add-on Payment Adjustment, or TDAPA,
followed by inclusion in the bundled reimbursement model for Medicare beneficiaries. For those that obtain dialysis through commercial insurance during
the 30-month coordination period or through Medicaid prior to Medicare becoming primary payer after 90 days, patients may access vadadustat through
contracts we negotiate with third party payors for reimbursement of vadadustat, which would be subject to the risks and uncertainties described above.
Additionally, applying for and obtaining reimbursement under the TDAPA is expected to take at least six months following approval, which will affect
adoption, uptake and product revenue for vadadustat during that time, and if there are updates to the TDAPA rule that decrease the basis for reimbursement
or eligibility criteria during the transition period or if the TDAPA is eliminated, then our profitability may be adversely affected. For example, the Medicare
Payment Advisory Commission, or MedPAC, an independent legislative branch advisory body to Congress on issues related to the Medicare program, has
recommended that TDAPA not be provided to newly approved drug products considered to fall within “functional categories” for which costs are already
accounted for in the bundled reimbursement model, such as for anemia management drugs.

Further, if vadadustat is approved in the United States and included in the fixed reimbursement model for a bundle of dialysis services, or the bundle, we
would be required to enter into contracts to supply vadadustat to specific dialysis providers, instead of through distributors, which we believe could be
challenging. The dialysis market is unique and is dominated by two providers: DaVita and Fresenius, which account for a vast majority of the dialysis
population in the United States. Under the Vifor Second Amended Agreement, we granted CSL Vifor an exclusive license to sell vadadustat to Fresenius
Medical Care North America and its affiliates, including Fresenius Kidney Care Group LLC, to certain third-party dialysis organizations approved by us, to
independent dialysis organizations that are members of group purchase organizations, and to certain non-retail specialty pharmacies in the United States.
We refer to Fresenius Medical Care North America and its affiliates, these organizations and specialty pharmacies collectively as the “Supply Group". See
Note 4 to our consolidated financial statements in Part II, Item 8. Financial Statements and Supplementary Data of this Annual Report on Form 10-K for
additional information

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regarding the Vifor Second Amended Agreement. If vadadustat is approved and we are not able to maintain the Vifor Second Amended Agreement or enter
into a supply agreement with DaVita or other dialysis clinics, our business may be materially harmed.

Similar to how payor coverage may affect the sales of a product, formulary status within dialysis organizations may affect what products are prescribed
within that specific organization. Therefore, if a product is not on a formulary, the prescribers within that organization may be less likely to prescribe that
product or may have a difficult time prescribing that product, resulting in less sales. Further, one dialysis organization’s determination to add a product to
their formulary does not assure that other dialysis organizations will also add the product to theirs. There is always a risk a dialysis organization will not
contract with a drug manufacturer for a specific product, resulting in that product not being on that organization’s formulary. If any dialysis organization
does not add vadadustat, if approved, to the formulary, our business may be materially harmed.

In addition, we may be unable to sell Auryxia or vadadustat, if approved, to dialysis providers on a profitable basis if CMS significantly reduces the level
of reimbursement for dialysis services and providers choose to use alternative therapies or look to re-negotiate their contracts with us. Our profitability may
also be affected if our costs of production increase faster than increases in reimbursement levels. Adequate coverage and reimbursement of our products by
government and private insurance plans are central to patient and provider acceptance of any products for which we receive marketing approval.

Further, in many countries outside the United States, a drug must be approved for reimbursement before it can be marketed or sold in that country. In some
cases, the prices that we intend to charge for our products are also subject to approval. Approval by the EMA or another regulatory authority does not
ensure approval by reimbursement authorities in that jurisdiction, and approval by one reimbursement authority outside the United States does not ensure
approval by any other reimbursement authorities. However, the failure to obtain reimbursement in one jurisdiction may negatively impact our ability to
obtain reimbursement in another jurisdiction. We may not be able to obtain such reimbursement approvals on a timely basis, if at all, and favorable pricing
in certain countries depends on a number of factors, some of which are outside of our control. In addition, if vadadustat is approved outside of the United
States, we plan to rely on a partner to obtain approval by reimbursement authorities outside the United States. If we are unsuccessful or delayed in entering
into an agreement with a new partner, the launch of vadadustat following approval outside the United States may be delayed, which could have an adverse
effect on our results of operations.

We face substantial competition, which may result in others discovering, developing or commercializing products before, or more successfully than, we
do.

The development and commercialization of new drugs is highly competitive and subject to rapid and significant technological change. Our future success
depends on our ability to demonstrate and maintain a competitive advantage with respect to the development and commercialization of Auryxia,
vadadustat, if approved, and any other product or product candidate, including those that may be in-licensed or acquired. Our objective is to continue to
commercialize Auryxia and develop and commercialize new products with clinically proven efficacy, convenience, tolerability and/or safety. In many
cases, any approved products that we commercialize will compete with existing, market-leading products.

Auryxia is competing in the hyperphosphatemia market in the United States with other FDA-approved phosphate binders such as Renagel® (sevelamer
hydrochloride) and Renvela® (sevelamer carbonate), both marketed by Sanofi, PhosLo® and Phoslyra® (calcium acetate), marketed by Fresenius Medical
Care North America, Fosrenol® (lanthanum carbonate), marketed by Shire Pharmaceuticals Group plc, and Velphoro® (sucroferric oxyhydroxide),
marketed by Fresenius Medical Care North America, as well as over-the-counter calcium carbonate products such as TUMS® and metal-based options
such as aluminum, lanthanum and magnesium. Most of the phosphate binders listed above are now also available in generic forms. In addition, other agents
are in development, including OPKO Health Inc.’s Alpharen™ Tablets (fermagate tablets) and Unicycive’s Renazorb (lanthanum dioxycarbonate) or could
otherwise enter the market, including Ardelyx, Inc.’s tenapanor (which is approved in the United States for the treatment of adults with irritable bowel
syndrome with constipation, and for which the FDA granted an appeal in the fourth quarter of 2022 that will allow Ardelyx to resubmit a new drug
application in 2023 with respect to the control of serum phosphorus in adult patients with CKD on dialysis), that may impact the market for Auryxia.

Auryxia is competing in the IDA market in the United States with over-the-counter oral iron, ferrous sulfate, other prescription oral iron formulations,
including ferrous gluconate, ferrous fumerate, and polysaccharide iron complex, and intravenous iron formulations, including Feraheme® (ferumoxytol
injection), Venofer® (iron sucrose injection), Ferrlicit® (sodium ferric gluconate complex in sucrose injection), Injectafer® (ferric carboxymaltose
injection), and Triferic® (ferric pyrophosphate citrate). In addition, other new therapies for the treatment of IDA may impact the market for Auryxia, such
as Shield Therapeutics plc's Feraccru® (ferric maltol), which is available in Europe for the treatment of IDA and Accrufer® (ferric maltol), which was
launched in the United States for the treatment of IDA in July 2021.

Furthermore, Auryxia’s commercial opportunities may be reduced or eliminated if our competitors develop and market products that are less expensive,
more effective, safer or offer greater patient convenience than Auryxia. Other companies have

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product candidates in various stages of preclinical or clinical development to treat diseases and complications of the diseases for which we are marketing
Auryxia. In addition, we and Keryx’s licensors, Panion & BF Biotech, Inc., or Panion, and, as applicable, Dr. Hsu, entered into settlement agreements with
each of the third parties who submitted Paragraph IV certification notice letters regarding Abbreviated New Drug Applications, or ANDAs, submitted to
the FDA, pursuant to which we granted licenses to market a generic version of Auryxia in the United States beginning in March 2025 (subject to FDA
approval), or earlier under certain circumstances customary for settlement agreements of this nature, which may impact our business and results of
operation.

Drugs that may compete with vadadustat include Epogen® (epoetin alfa) and Aranesp® (darbepoetin alfa), both commercialized by Amgen, Procrit®
(epoetin alfa) and Eprex® (epoetin alfa), commercialized by Johnson & Johnson in the United States and Europe, respectively, and Mircera® (methoxy
PEG-epoetin beta), commercialized by CSL Vifor in the United States and Roche Holding Ltd. outside of the United States.

We and our partners may also face competition from potential new anemia therapies. There are several other hypoxia-inducible factor prolyl hydroxylase,
or HIF-PH, inhibitor product candidates in various stages of development for anemia indications that may be in direct competition with vadadustat if and
when they are approved and launched commercially. These candidates are being developed by companies such as FibroGen Inc., or FibroGen, together
with its collaboration partners, Astellas Pharma Inc. and AstraZeneca PLC, Japan Tobacco International, or JT, GlaxoSmithKline plc, or GSK, and Bayer
HealthCare AG, or Bayer.

Furthermore, certain companies are developing potential new therapies for renal-related diseases that could potentially reduce injectable erythropoiesis
stimulating agent, or ESA, utilization and thus limit the market potential for vadadustat if they are approved and launched commercially. Other new
therapies are in development for the treatment of conditions inclusive of renal anemia that may impact the market for anemia-targeted treatment.

In addition, in the United States, FibroGen filed an NDA for its product candidate, roxadustat, with the FDA, but the FDA issued a complete response letter
indicating the FDA will not approve the NDA in its present form and requested that an additional clinical trial for roxadustat be conducted prior to
resubmission of the NDA or additional response to the FDA's complete response letter. In Europe however, roxadustat is approved for the treatment of
anemia in patients with CKD. Further, in February 2023 the FDA approved daprodustat, an oral HIF-PH inhibitor marketed as Jesduvroq by GSK, as a
once-a-day treatment of anemia due to CKD in adult patients who have been receiving dialysis for at least four months. If we obtain approval for
vadadustat in the U.S., and roxadustat is also approved by the FDA, then both daprodustat and roxadustat will compete with vadadustat.

In Japan, Vafseo, which is approved for both the DD and NDD indications, competes with roxadustat, daprodustat and enarodustat. Roxadustat is approved
for the treatment of anemia due to CKD in patients on dialysis, or DD-CKD, and patients not on dialysis, or NDD-CKD. In addition, daprodustat, GSK’s
product, and enarodustat, JT’s product candidate, are approved in Japan for the treatment of anemia due to CKD. In addition. Bayer HealthCare AG has
submitted an NDA for its product candidate for the treatment of renal anemia in Japan. In China, roxadustat has launched for the treatment of anemia of
DD-CKD and for the treatment of anemia due to CKD in NDD-CKD patients.

A biosimilar is a biologic product that is approved based on demonstrating that it is highly similar to an existing, FDA-approved branded biologic product.
The patents for the existing, branded biologic product must expire in a given market before biosimilars may enter that market without risk of being sued for
patent infringement. In addition, an application for a biosimilar product cannot be approved by the FDA until 12 years after the existing, branded product
was approved under a Biologics License Application, or BLA. The patents for epoetin alfa, an injectable ESA, expired in 2004 in the EU, and the
remaining patents expired between 2012 and 2016 in the United States. Because injectable ESAs are biologic products, the introduction of biosimilars into
the injectable ESA market in the United States will constitute additional competition for vadadustat if we are able to obtain approval for and commercially
launch vadadustat. In the United States, Pfizer’s biosimilar version of injectable ESAs, Retacrit® (epoetin alfa-epbx), was approved by the FDA in May
2018 and launched in November 2018 and several biosimilar versions of injectable ESAs are available for sale in the EU.

Many of our potential competitors have significantly greater financial, manufacturing, marketing, drug development, technical and human resources than
we do. Large pharmaceutical companies, in particular, have extensive experience in clinical testing, obtaining marketing approvals, recruiting patients and
manufacturing pharmaceutical products. Large and established companies such as Amgen, Roche and GSK, among others, compete in the market for drug
products to treat kidney disease. In particular, these companies have greater experience and expertise in conducting preclinical testing and clinical trials,
obtaining marketing approvals, manufacturing such products on a broad scale and marketing approved products. These companies also have significantly
greater research and marketing capabilities than we do and may also have products that have been approved or are in late stages of development and have
collaborative arrangements in our target markets with leading companies and research institutions. Established pharmaceutical companies may also invest
heavily to accelerate discovery and development of novel compounds or to in-license novel compounds that could make the product candidates that we are
developing obsolete.

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Smaller and other early-stage companies may also prove to be significant competitors. As a result of all of these factors, our competitors may succeed in
obtaining patent protection and/or marketing approval, or discovering, developing and commercializing competitive products, before, or more effectively
than, we do. If we are not able to compete effectively against potential competitors, our business will not grow and our financial condition and operations
will suffer.

The commercialization of Riona  and Vafseo  in Japan and our current and potential future efforts with respect to the development and
commercialization of our products and product candidates outside of the United States subject us to a variety of risks associated with international
operations, which could materially adversely affect our business.

TM

TM

Our Japanese sublicensee, JT, and its subsidiary, Torii Pharmaceutical Co., Ltd., or Torii, commercialize Riona, the trade name for ferric citrate hydrate in
Japan, as an oral treatment for the improvement of hyperphosphatemia in patients with CKD, including DD-CKD and NDD-CKD, and for the treatment of
adult patients with IDA in Japan. In Japan and certain other countries in Asia, we granted MTPC exclusive rights to commercialize vadadustat, which has
been approved and is being marketed by MTPC in Japan under the trade name Vafseo . We also granted Averoa SAS, or Averoa, an exclusive license to
develop and commercialize ferric citrate in the EEA, Turkey, Switzerland and the United Kingdom.

TM

Pursuant to the terms of the Termination Agreement with Otsuka, Otsuka has transferred to us the marketing authorization application, or MAA, for
vadadustat with the EMA, and in the United Kingdom, Switzerland and Australia. In addition, we have conducted and in the future plan to conduct clinical
trials outside of the United States for Auryxia, vadadustat and any other product or product candidate that may be in-licensed or acquired. As a result of
these and other activities, we are or may become subject to additional risks in developing and commercializing Auryxia and vadadustat outside the United
States, including, among others:

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political, regulatory, compliance and economic developments, weakness or instability that could restrict our ability to manufacture, market and sell
our products;
changes in international medical reimbursement policies and programs;
changes in healthcare policies of foreign jurisdictions;
trade protection measures, including import or export licensing requirements and tariffs and our compliance therewith;
our ability to develop or manage relationships with qualified local distributors and trading companies;
diminished protection of intellectual property in some countries outside of the United States;
differing labor regulations and business practices;
compliance with laws, including the U.S. Foreign Corrupt Practices Act, or FCPA, the UK Bribery Act or similar local regulation, the EU General
Data Protection Regulation, or GDPR, and similar data protection laws, and tax, employment, immigration and labor laws;
economic weakness, including inflation, or political instability in particular foreign economies and markets;
foreign currency fluctuations, which could result in increased operating expenses and reduced revenues, and other obligations incident to doing
business in another country;
production shortages resulting from any events affecting raw material supply or manufacturing capabilities abroad, including as a result of the
COVID-19 pandemic; and
business interruptions resulting from geopolitical actions, including war and terrorism, global pandemics, or natural disasters including
earthquakes, typhoons, floods and fires.

In addition, we receive revenues from royalty payments converted to U.S. dollars based on net sales of Riona and Vafseo  in Japanese yen. The exchange
rates  between  the  Japanese  yen  on  the  one  hand,  and  the  U.S.  dollar,  on  the  other  hand,  have  changed  substantially  in  recent  years  and  may  fluctuate
substantially  in  the  future.  Our  results  of  operations  could  be  adversely  affected  over  time  by  certain  movements  in  exchange  rates,  particularly  if  the
Japanese yen depreciates against the U.S. dollar.

TM

Any of these factors may, individually or as a group, have a material adverse effect on our business and results of operations. As and if we continue to
expand our commercialization efforts, we may encounter new risks.

Risks Related to Product Development

Clinical drug development involves a lengthy and expensive process with an uncertain outcome, and we will incur additional costs in connection with,
and may experience delays in completing, or ultimately be unable to complete, the development and, if approved, commercialization of vadadustat and
any other product candidates.

The risk of failure in drug development is high. Before obtaining marketing approval from regulatory authorities for the sale of any product candidate, we
must complete preclinical development and conduct extensive clinical trials to demonstrate the safety

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and efficacy of our product candidates in humans. Preclinical studies and clinical trials are expensive, difficult to design and implement, can take several
years to complete, and their outcomes are inherently uncertain. Failure can occur at any time during the process. For example, we are currently conducting
a clinical trial to evaluate three times per week oral dosing of vadadustat for dialysis dependent patients with anemia due to chronic kidney disease, or
CKD. If we experience delays in the conduct of this clinical trial or the results are not positive, it could affect the market potential of vadadustat, if
approved.

2

We may be unable to successfully complete clinical trials of Auryxia, vadadustat and other product candidates or to successfully obtain approval of
vadadustat or other product candidates, if the results of those trials and studies are not positive or are only modestly positive, or if there are concerns with
the profile due to efficacy or safety. Further, the results of preclinical studies and early clinical trials of our product candidates may not be predictive of the
results of later-stage clinical trials, interim results of a clinical trial do not necessarily predict final results, and results of Phase 3 clinical trials for one
indication may not be predictive of results of Phase 3 clinical trials for another indication. For example, we announced positive top-line results from
INNO VATE and vadadustat achieved the primary and key secondary efficacy endpoint in each of the two PRO TECT studies, but the PRO TECT program
did not meet the primary major adverse cardiovascular event, or MACE, safety endpoint. Many companies in the biopharmaceutical industry have suffered
significant setbacks in late-stage clinical trials after achieving positive results in early-stage development, and we may face similar setbacks. Moreover,
preclinical and clinical data are often susceptible to varying interpretations and analyses, and many companies that have believed their product candidates
performed satisfactorily in preclinical studies and clinical trials have nonetheless failed to obtain marketing approval of their product candidates. In
addition, in March 2022, we received the CRL for vadadustat indicating that the FDA had determined that it could not approve the NDA in its present
form, thus delaying any potential approval of vadadustat. In October 2022, we submitted the FDRR to the FDA and in February 2023, we received a
second interim response from the FDA to our FDRR. However, it is impossible to predict when or if vadadustat or any of our other product candidates will
prove effective or safe in humans or will receive marketing approval or on what terms. In February 2023, the Committee for Medicinal Products for Human
Use, or CHMP, of the EMA adopted a positive opinion recommending the European Commission, or EC, to approve Vafseo™ (vadadustat), an oral HIF-
PH inhibitor for the treatment of symptomatic anemia associated with CKD in adults on chronic maintenance dialysis. However, before we can market and
sell vadadustat in Europe, the EC must approve vadadustat, and there can be no assurances that we will receive such approval in a timely manner, or at all.

2

2

We may experience numerous unforeseen events during, or as a result of, preclinical development or clinical trials that could delay, prevent or make more
challenging our ability to receive or maintain marketing approval or commercialize our product candidates. We may be required to complete additional
clinical trials for Auryxia, vadadustat and any other product or product candidate, including those that may be in-licensed or acquired, in order to obtain or
maintain required regulatory approvals. Our preclinical studies and clinical trials may take longer to complete than currently anticipated, or may be
delayed, suspended, required to be repeated, prematurely terminated or may not successfully demonstrate safety and/or efficacy needed to obtain or
maintain regulatory approval for a variety of other reasons, such as:

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•

•

•

•

•

the costs may be greater than we anticipate;
the number of patients required for clinical trials may be larger than we anticipate;
enrollment in our clinical trials may be slower than we anticipate, or participants may drop out of these clinical trials at a higher rate than we
anticipate;
our third party contractors, such as our CROs, may fail to comply with regulatory requirements, perform effectively, or meet their contractual
obligations to us in a timely manner, or at all, or we may fail to communicate effectively or provide the appropriate level of oversight of such third
party contractors;
the supply or quality of our starting materials, drug substance and drug product necessary to conduct clinical trials of our product candidates may
be insufficient or inadequate;
regulators, independent data monitoring committees, or IDMCs, institutional review boards, or IRBs, safety committees, or ethics committees,
may require that we suspend or terminate our clinical trials for various reasons, including noncompliance with regulatory requirements, unforeseen
safety issues or adverse side effects, failure to demonstrate a benefit from using our product candidate, or a finding that the participants are being
exposed to unacceptable health risks;
clinical trials of our product candidates may produce negative or inconclusive results or results that may be interpreted in a manner different than
we interpret them, and we may decide, or regulators may require us, to conduct additional clinical trials, repeat a clinical trial or abandon product
development programs;
lack of adequate funding to continue a clinical trial, including unforeseen costs due to enrollment delays, requirements to conduct additional
clinical trials or repeat a clinical trial and increased expenses associated with the services of our CROs and other third parties;

• we may fail to initiate, delay of or failure to complete a clinical trial as a result of an Investigational New Drug application, or IND, being placed
on clinical hold by the FDA, the EMA, the PMDA, or other regulatory authorities, or for other reasons, such as failure to recruit or enroll suitable
patients or patients' failure to return for post-treatment follow up;

• we may determine to change or expand a clinical trial, including after it has begun;

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clinical trial sites and investigators deviating from the clinical protocol, failing to conduct the trial in accordance with regulatory requirements, or
dropping out of a trial, or failure by us or our CROs to communicate effectively or provide the appropriate level of oversight of such clinical sites
and investigators;
there may be an inability, delay, or failure in identifying and maintaining a sufficient number of clinical trial sites, many of which may already be
engaged in other clinical programs;
there may be a delay or failure in reaching agreement with the FDA, the EMA, the PMDA or other regulatory authorities on a clinical trial design
upon which we are able to execute;
there may be a delay or failure in obtaining authorization to commence a clinical trial or inability to comply with conditions imposed by a
regulatory authority regarding the scope or design of a clinical trial;
there may be delays in reaching, or failure to reach, agreement on acceptable terms with prospective clinical trial sites and prospective CROs, the
terms of which can be subject to extensive negotiation and may vary significantly among different CROs and clinical trial sites;
the FDA, the EMA, the PMDA or other regulatory authorities may require us to submit additional data or impose further requirements before
permitting us to initiate a clinical trial or during an ongoing clinical trial;
the FDA, the EMA, the PMDA or other regulatory authorities may disagree with our clinical trial design and our interpretation of data from
clinical trials, or may change the requirements for approval even after it has reviewed and commented on the design for our clinical trials;
third parties with which we work may fail to comply with good practice quality guidelines and regulations, or GXP, including good laboratory
practice, good clinical practice, or GCP, and current good manufacturing practice, or cGMP; or
there may be changes in governmental regulations or administrative actions.

If any of the foregoing occurs, the following may occur:

•

regulators may require that we conduct additional clinical trials, repeat clinical trials or conduct other studies beyond those that we currently
contemplate;

• we may be delayed in obtaining marketing approval for vadadustat or other product candidates;
• we may not obtain marketing approval for vadadustat or other product candidates at all;
• we may obtain approval for indications or patient populations that are not as broad as intended or desired;
• we may obtain approval with labeling that includes significant use or distribution restrictions or safety warnings that would reduce the potential

•

market for any approved product or inhibit our ability to successfully commercialize any approved product;
a REMS or FDA-imposed risk management plan that use risk minimization strategies to ensure that the benefits of certain prescription drugs
outweigh their risks, may be required;

• we may be subject to additional post-marketing restrictions and/or requirements; or
•
the product may be removed from the market after obtaining marketing approval.

Our product development costs may also increase if we experience development delays or delays in receiving the requisite marketing approvals. Our
preclinical studies or clinical trials may need to be restructured or may not be completed on schedule, or at all. Significant preclinical or clinical trial delays
also could shorten any periods during which we may have the exclusive right to commercialize vadadustat, if approved, or any other product candidate,
including those that may be in-licensed or acquired, or allow our competitors to bring products to market before we do. This could impair our ability to
successfully commercialize our product candidates and may harm our business and results of operations.

We may find it difficult to enroll patients in our clinical trials, which could delay or prevent clinical trials of Auryxia, vadadustat or any other product
or product candidate, including those that may be in-licensed or acquired.

Identifying and qualifying patients to participate in clinical trials is critical to our success. The timing of our clinical trials depends, in part, on the speed at
which we can recruit patients to participate in our clinical trials. Patients may be unwilling to participate in our clinical trials because of concerns about
investigational research studies, the time and commitment needed to participate in a study, adverse events observed with the product candidate under study,
the current standard of care, competitor products and/or other investigational agents, in each case for the same indications and/or similar patient
populations. In addition, in the case of clinical trials of any product candidate, patients currently receiving treatment with the current standard of care or a
competitor product may be reluctant to participate in a clinical trial with an investigational drug. Additionally, it is often more difficult to enroll special or
particular subpopulations of patients, such as pediatric or elderly patients, due to a number of factors including parental or other caregiver considerations,
concerns and burdens. For example, we enrolled sites in a post-approval pediatric study for the Hypophosphatemia Indication of Auryxia in the second
quarter of 2022, which began patient recruitment in the third quarter of 2022, but study sites have not yet enrolled any eligible pediatric patients despite
efforts to do so. Furthermore, the COVID-19 pandemic resulted in temporary closures of, and may continue to impact, clinical

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trial sites on which we rely for the conduct of clinical trials and COVID-19 pandemic precautions and staffing shortages have caused moderate delays in
enrolling new clinical trials and may cause delays in enrolling other new clinical trials.

Finally, competition for clinical study sites may limit our access to patients appropriate for our clinical trials. As a result, the timeline for recruiting patients
and conducting studies may be delayed. These delays could result in increased costs, delays in advancing our development of any product or product
candidate, or termination of the clinical trial altogether.

We may not be able to identify, recruit and enroll a sufficient number of patients, or those with required or desired characteristics, to complete our clinical
trials in a timely manner. Patient enrollment is affected by many factors, including:

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severity of the disease under investigation;
design of the study protocol;
size and nature of the patient population;
eligibility criteria for, and design of, the study in question, including study complexity;
perceived risks and benefits of the product or product candidate under study, including as a result of adverse effects observed in similar or
competing therapies;
proximity and availability of clinical study sites for prospective patients;
availability of competing therapies and clinical trials and clinicians’ and patients’ perceptions as to the potential advantages of the product or
product candidate being studied in relation to available therapies or other product candidates in development;
efforts to facilitate timely enrollment in clinical trials;
participation length and demands on patients and caregivers;
site staffing shortages and turnover;
clinical trial sites and investigators failing to perform effectively; and
patient referral practices of physicians.

We may not be able to initiate or complete clinical trials in a timely manner, or at all, if we cannot enroll a sufficient number of eligible patients to
participate in the clinical trials required by regulatory agencies. If we have difficulty enrolling a sufficient number of patients to conduct our clinical trials
as planned, we may need to delay, limit or terminate ongoing or planned clinical trials, any of which may delay approval, or result in failure to maintain or
obtain approval, of our products or product candidates, which would have a material adverse effect on our business.

Conducting clinical trials outside of the United States, as we have done historically and as we may decide to do in the future, presents additional risks
and complexities and, if we decide to conduct a clinical trial outside of the United States in the future, we may not complete such trials successfully, in
a timely manner, or at all, which could affect our ability to obtain regulatory approvals.

Our ability to successfully initiate, enroll and complete a clinical study in any country outside of the United States is subject to numerous additional risks
unique to conducting business in jurisdictions outside the United States, including:

•
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•

difficulty in establishing or managing relationships with qualified CROs, physicians and clinical trial sites;
difficulty in complying with different local standards for the conduct of clinical trials;
difficulty in complying with various and complex import laws and regulations when shipping drug to certain countries; and
the potential burden of complying with a variety of laws, medical standards and regulatory requirements, including the regulation of
pharmaceutical and biotechnology products and treatments.

Data obtained from studies conducted in the United States may not be accepted by the EMA, the PMDA and other regulatory authorities outside of the
United States. Also, certain jurisdictions require data from studies conducted in their country in order to obtain approval in that country. Further, when a
foreign clinical study is not conducted under an IND, the sponsor must ensure that the study complies with certain regulatory requirements of the FDA in
order to use the study as support for an IND or application for marketing approval. Specifically, the studies must be conducted in accordance with GCP,
including undergoing review and receiving approval by an independent ethics committee, and seeking and receiving informed consent from subjects. Thus,
to the extent that we rely on data from foreign clinical studies that are not the subject of an IND but are used to support of an NDA, there is a risk that FDA
may not review such data in connection with its review of the NDA.

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If we or our collaboration partners have difficulty conducting future clinical trials in jurisdictions outside the United States as planned, we may need to
delay, limit or terminate such clinical trials, any of which could have an adverse effect on our business.

Auryxia, vadadustat or any other product or product candidate, including those that may be in-licensed or acquired, may cause undesirable side effects
or have other properties that may delay or prevent marketing approval or limit their commercial potential.

Undesirable effects caused by, or other undesirable properties of, Auryxia, vadadustat or any other product or product candidate, including those that may
be in-licensed or acquired, or competing commercial products or product candidates in development that utilize a common mechanism of action could
cause us or regulatory authorities to interrupt, delay or halt clinical trials, could result in a more restrictive label or the delay, denial or withdrawal of
marketing approval by the FDA or other regulatory authorities, and could lead to potential product liability claims. In addition, results of our clinical trials
could reveal a high frequency of undesirable effects or unexpected characteristics. For example, in March 2022, we received the CRL from the FDA for our
NDA for vadadustat in which the FDA concluded that the data in the NDA do not support a favorable benefit-risk assessment of vadadustat for dialysis and
non-dialysis patients. The FDA expressed safety concerns noting failure to meet non-inferiority in MACE in the non-dialysis patient population, the
increased risk of thromboembolic events, driven by vascular access thrombosis in dialysis patients, and the risk of drug-induced liver injury. In October
2022, we submitted the FDRR to the FDA. The FDRR focuses on the favorable balance between the benefits and risks of vadadustat for the treatment of
anemia due to CKD in adult patients on dialysis in light of safety concerns expressed by the FDA in the CRL for dialysis patients related to the rate of
adjudicated thromboembolic events driven by vascular access thrombosis for vadadustat compared to the active comparator and the risk of drug-induced
liver injury. In February 2023, we received a second interim response from the FDA to our FDRR, and there can be no assurances that we will be
successful in our appeal. If we are unable to overcome these concerns, vadadustat may not be approved by the FDA on favorable terms, or at all, and our
financial condition could be materially harmed. In February 2023, the CHMP of the EMA adopted a positive opinion recommending the EC to approve
Vafseo™ for the treatment of symptomatic anemia associated with CKD in adults on chronic maintenance dialysis. However, before we can market and sell
vadadustat in Europe, the EC must approve vadadustat, and there can be no assurances that we will receive such approval in a timely manner, or at all.

If we or others identify undesirable effects caused by, or other undesirable properties of, Auryxia, vadadustat, or any other product or product candidate,
including those that may be in-licensed or acquired, or if known undesirable effects are more frequent or severe than in the past, or if any of the foregoing
are perceived to have occurred, either before or after receipt of marketing approval, a number of potentially significant negative consequences could result,
including:

our product candidates may not be approved by regulatory authorities;
our clinical trials may be put on hold;
patient recruitment could be slowed, and enrolled patients may not want to complete the clinical trial;
regulatory authorities may require warnings on the label, such as the warning on Auryxia’s label regarding iron overload;
REMS or FDA-imposed risk management plans that use restrictive risk minimization strategies may be required;

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•
•
•
•
• we may decide to, or be required to, send drug warnings or safety alerts to physicians, pharmacists and hospitals (or the FDA or other regulatory
authorities may choose to issue such alerts), or we may decide to conduct a product recall or be requested to do so by the FDA or other regulatory
authority;
reformulation of the product, additional non-clinical or clinical trials, restrictive changes in labeling or changes to or re-approvals of
manufacturing facilities may be required;

•

• we may be precluded from pursuing additional development opportunities to enhance the clinical profile of a product within its indicated

populations, or studying the product or product candidate in additional indications and populations or in new formulations; and
• we could be investigated by the government or sued and held liable for harm caused to patients, including in class action lawsuits; and
•

our reputation may suffer.

Any of these events could prevent us from achieving or maintaining, whether on a restricted basis or at all, marketing approval and, ultimately, market
acceptance or penetration of Auryxia, vadadustat or any other product or product candidate, including those that may be in-licensed or acquired. In
addition, any of these events could substantially increase our costs, and could significantly impact our ability to successfully commercialize Auryxia,
vadadustat or any other product and product candidate, including those that may be in-licensed or acquired, and generate product revenue.

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The patient populations treated with Auryxia and potential patient populations for vadadustat, if approved, have CKD, a serious disease that increases the
risk of cardiovascular disease including heart attacks and stroke and, in its most severe form, results in, kidney failure and the need for dialysis or kidney
transplant. Many patients with CKD are elderly with comorbidities making them susceptible to significant health risks. Therefore, the likelihood of these
patients having adverse events, including serious adverse events is high.

2

With respect to the global INNO VATE Phase 3 program, the incidence of treatment emergent adverse events during the Correction and Conversion study
in vadadustat treated patients was 83.8% and 85.5% in darbepoetin alfa treated patients. During the study, the most common treatment emergent adverse
events reported in vadadustat/darbepoetin alfa treated patients were hypertension (16.2%/ 12.9%) and diarrhea (10.1%/ 9.7%). Serious treatment emergent
adverse events were lower in vadadustat treated patients at 49.7% compared to 56.5% for darbepoetin alfa treated patients. The incidence of treatment
emergent adverse events during the prevalent dialysis patient study (Conversion) in the vadadustat treated patients was 88.3%, and 89.3% in darbepoetin
alfa treated patients. During the study, the most common treatment emergent adverse events reported in vadadustat/darbepoetin alfa treated patients were
diarrhea (13.0%/ 10.1%), pneumonia (11.0%/ 9.7%), hypertension (10.6%/ 13.8%), and hyperkalemia (9.0%/ 10.8%). Serious treatment emergent adverse
events were slightly lower for vadadustat treated patients at 55.0% and 58.3% for darbepoetin alfa-treated patients. Patients with DD-CKD experienced an
increased risk of thromboembolic events compared to darbepoetin alfa with a time to first event HR of 1.20 (95% CI 0.96 - 1.50) driven by thrombosis of
vascular access.

2

With respect to the global PRO TECT Phase 3 program, the incidence of treatment emergent adverse events during the ESA untreated patients study
(Correction) in the vadadustat-treated patients was 90.9%, and 91.6% in darbepoetin alfa-treated patients. During the study, the most common treatment
emergent adverse events reported in vadadustat/darbepoetin alfa-treated patients were end-stage renal disease (34.7%/ 35.2%), hypertension (17.7%/
22.1.%), hyperkalemia (12.3.%/ 15.6%), urinary tract infection (12.9%/ 12.0%), diarrhea (13.9%/ 10.0%), peripheral oedema (12.5%/ 10.5%), fall (9.6%/
10%) and nausea (10%/ 8.2%). Serious treatment emergent adverse events were 65.3% for vadadustat-treated patients and 64.5% for darbepoetin alfa-
treated patients. The incidence of treatment emergent adverse events during the ESA-treated patients study (Conversion) in vadadustat treated patients was
89.1% and 87.7% in darbepoetin alfa-treated patients. During the study, the most common treatment emergent adverse events reported in
vadadustat/darbepoetin alfa-treated patients were end-stage renal disease (27.5%/ 28.4%), hypertension (14.4%/ 14.8%), urinary tract infection (12.2%/
14.5%), diarrhea (13.8.%/ 8.8.%), peripheral oedema (9.9%/ 10.1%) and pneumonia (10.0%/ 9.7%). Serious treatment emergent adverse events were
58.5% for vadadustat-treated patients and 56.6% for darbepoetin alfa-treated patients.

For example, during the conduct of our Phase 3 program our team and hepatic experts analyzed hepatic cases (unblinded to treatment) and, following the
completion of our global Phase 3 clinical program for vadadustat, there was a review of hepatic safety across the vadadustat clinical program, which
included eight completed Phase 2 and 3 studies in NDD-CKD patients, 10 completed Phase 1, 2, and 3 studies, and two then-ongoing Phase 3b studies in
DD-CKD patients, and 18 completed studies in healthy subjects (17 Phase 1 and one Phase 3). This review consisted of a blinded re-assessment of hepatic
events conducted by a separate panel of hepatic experts. While hepatocellular injury attributed to vadadustat was reported in less than 1% of patients, there
was one case of severe hepatocellular injury with jaundice, and we cannot guarantee that similar events will not happen in the future. Additionally, the FDA
expressed safety concerns related to the risk of drug-induced liver injury in the CRL that it issued in March 2022.

Serious adverse events considered related to vadadustat, including those noted in the CRL, and any other product candidates could have material adverse
consequences on the development and potential approval of vadadustat or our other product candidates and our business as a whole. Our understanding of
adverse events in prior clinical trials of our product candidates may change as we gather more information, the FDA may not agree with our assessment of
adverse events and additional unexpected adverse events may be observed in future clinical trials or in the market.

Any of the above safety data or other occurrences could delay or prevent us from achieving or maintaining marketing approval, harm or prevent sales of
Auryxia or, if approved, vadadustat or any other product or product candidate, including those that may be in-licensed or acquired, increase our expenses
and impair or prevent our ability to successfully commercialize Auryxia, vadadustat or any other products or product candidates.

In addition, any post-marketing clinical trials conducted, if successful, may expand the patient populations treated with Auryxia, vadadustat or any other
product we acquire or for which we receive marketing approval, within or outside of their current indications or patient populations, which could result in
the identification of previously unknown undesirable effects, increased frequency or severity of known undesirable effects, or result in the identification of
unexpected safety signals. In addition, as vadadustat, if approved, and any other products are commercialized, they will be used in significantly larger
patient populations, in less rigorously controlled environments and, in some cases, by less experienced and less expert treating practitioners, than in clinical
trials, which could result in increased or more serious adverse effects being reported. As a result, regulatory authorities, healthcare practitioners, third party
payors or patients may perceive or conclude that the use of Auryxia,

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vadadustat, if approved, or any other products are associated with serious adverse effects, undermining our commercialization efforts.

Risks Related to Regulatory Approval

We may not be able to obtain marketing approval for, or successfully commercialize, vadadustat or any other product candidate, or we may experience
significant delays in doing so, any of which would materially harm our business.

Clinical trials, manufacturing and marketing of any product or product candidate are subject to extensive and rigorous review and regulation by numerous
governmental authorities in the United States and other jurisdictions. Before obtaining marketing approval for the commercial sale of any product
candidate, we must demonstrate through extensive preclinical testing and clinical trials that the product candidate is safe and effective for use in each target
indication. This process can take many years and marketing approval may never be achieved. Of the large number of drugs in development in the United
States and in other jurisdictions, only a small percentage successfully complete the FDA’s and other jurisdictions’ marketing approval processes and are
commercialized. Accordingly, even if we are able to obtain the requisite capital to continue to fund our development and commercialization efforts, we may
be unable to successfully obtain regulatory approval for or commercialize vadadustat or any other product or product candidate, including those that may
be in-licensed or acquired.

We are not permitted to market vadadustat in the United States until we receive approval from the FDA, in the EU until we receive approval from the
EMA, or in any other jurisdiction until the requisite approval from regulatory authorities in such jurisdiction is received. As a condition to receiving
marketing approval for vadadustat, we may be required by the FDA, the EMA or other regulatory authorities to conduct additional preclinical studies or
clinical trials.

In March 2022, we received the CRL from the FDA regarding our NDA for vadadustat for the treatment of anemia due to CKD. The FDA concluded that
the data in the NDA do not support a favorable benefit-risk assessment of vadadustat for dialysis and non-dialysis patients. In October 2022, we submitted
a Formal Dispute Resolution Request, or FDRR, to the FDA. The FDRR focuses on the favorable balance between the benefits and risks of vadadustat for
the treatment of anemia due to CKD in adult patients on dialysis in light of safety concerns expressed by the FDA in the CRL for dialysis patients related to
the rate of adjudicated thromboembolic events driven by vascular access thrombosis for vadadustat compared to the active comparator and the risk of drug-
induced liver injury. In February 2023, we received a second interim response from the FDA to our FDRR, and there can be no assurances that we will be
successful in our appeal and obtain approval for vadadustat in a timely manner, on favorable terms, or at all. As a result, the regulatory approval process for
vadadustat in the U.S. is highly uncertain. We may not obtain approval at all, and if we are able to obtain approval, it may only be for patients with DD-
CKD and, in any event, the expense and time to do so could adversely impact our ability to successfully commercialize vadadustat, and our financial
condition could be materially harmed.

Further, vadadustat and any other product candidate may not receive marketing approval in the United States or the EU even if it is approved in other
countries. For example, although vadadustat is approved in Japan for the treatment of anemia due to CKD in DD-CKD and NDD-CKD adult patients, such
approval does not guarantee approval in the United States by the FDA or in the EU by the EMA for these indications or at all. In addition, while each
regulatory authority makes their own assessment as to the safety and efficacy of a drug, FDA’s concern about the safety or efficacy of vadadustat or any
other product candidate could impact the regulatory authority’s decision in another country.

Obtaining marketing approval in the United States and other jurisdictions for any product candidate depends upon numerous factors, many of which are
subject to the substantial discretion of the regulatory authorities, including that regulatory agencies may not complete their review processes in a timely
manner and, following completion of the review process, may not grant marketing approval or such marketing approval may be limited. Furthermore,
approval of a drug does not ensure successful commercialization. For example, on September 23, 2015, the European Commission, or EC, approved
Fexeric for the control of hyperphosphatemia in adult patients with CKD. Pursuant to the sunset clause under EU law, the EC’s approval of Fexeric in the
EU was contingent on, among other things, our commencing marketing of Fexeric within three years; although we successfully negotiated an extension to
December 23, 2019, we did not commence marketing Fexeric by such date and therefore the Fexeric approval in the EU has ceased to be valid.

We could face heightened risks with respect to seeking marketing approval in the United Kingdom, or UK, as a result of the recent withdrawal of the UK
from the EU, commonly referred to as Brexit. Pursuant to the formal withdrawal arrangements agreed between the UK and the EU, the UK withdrew from
the EU, effective December 31, 2020. On December 24, 2020, the UK and the EU entered into a Trade and Cooperation Agreement. The agreement sets
out certain procedures for approval and recognition of medical products in each jurisdiction. Any delay in obtaining, or an inability to obtain, any
marketing approvals, as a result of the Trade and Cooperation Agreement would prevent us from commercializing vadadustat or any other product
candidate, including those that may be in-licensed or acquired, in the UK and/or the EU and restrict our ability to generate revenue and achieve and sustain
profitability. If any of these outcomes occur, we may be forced to restrict or delay efforts to

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seek regulatory approval in the UK and/or the EU for vadadustat or any other product candidate, which could significantly and materially harm our
business. As of January 1, 2021, the Medicines and Healthcare Products Regulatory Agency, or the MHRA, became responsible for supervising medicines
and medical devices in Great Britain, comprising England, Scotland and Wales under domestic law, whereas Northern Ireland will continue to be subject to
European Union rules under the Northern Ireland Protocol. The MHRA will rely on the Human Medicines Regulations 2012 (SI 2012/1916) (as amended)
as the basis for regulating medicines.

In addition, the safety concerns associated with the current standard of care for the indications for which we are seeking marketing approval for vadadustat
may affect the FDA’s, the EMA’s or other regulatory authorities’ review of the safety results of vadadustat. Additionally, these regulatory authorities may
not agree with our assessment of adverse events. Further, the policies or regulations, or the type and amount of clinical data necessary to gain approval,
may change during the course of a product candidate’s clinical development and may vary among jurisdictions. It is possible that vadadustat will never
obtain marketing approval in the United States or certain other jurisdictions or for some or all of the indications for which we seek approval. The FDA, the
EMA or other regulatory authorities may delay, limit or deny approval of vadadustat for many reasons including, among others:

• we may not be able to demonstrate that vadadustat is safe and effective in treating adult patients with anemia due to CKD to the satisfaction of the

•
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•
•

relevant regulatory authority;
the results of our clinical trials may only be modestly positive, or there may be concerns with the profile due to efficacy or safety;
the results of our clinical trials may not meet the level of statistical or clinical significance required by the relevant regulatory authority for review
and/or marketing approval;
the relevant regulatory authority may disagree with our interpretation of data from our preclinical studies and clinical trials;
the relevant regulatory authority may disagree with the number, design, size, conduct or implementation of our clinical trials;
the relevant regulatory authority may not approve the formulation, labeling or specifications we request for vadadustat;
the relevant regulatory authority may approve vadadustat or any other product candidate for use only in a small patient population or for fewer or
more limited indications than we request;
•
the relevant regulatory authority may require that we conduct additional clinical trials or repeat one or more clinical trials;
•
the FDA or other relevant regulatory authority may require development of a REMS as a condition of approval or post-approval;
•
the relevant regulatory authority may grant approval contingent on the performance of costly post-marketing clinical trials;
•
the relevant regulatory authority's onsite inspections may be delayed due to the COVID-19 pandemic or otherwise;
• we, or our CROs or other vendors, may fail to comply with GXP or fail to pass any regulatory inspections or audits;
• we or our third party manufacturers may fail to perform in accordance with the FDA’s or other relevant regulatory authority's cGMP requirements

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and guidance;
the FDA may disagree with inclusion of data obtained from certain regions outside the United States to support the NDA for potential reasons
such as differences in clinical practice from United States standards;
the relevant regulatory authority could deem that our financial relationships with certain principal investigators constitute a conflict of interest,
such that the data from those principal investigators may not be used to support our applications;
as part of any future regulatory process, the FDA may ask an Advisory Committee to review portions of the NDA, the FDA may have difficulty
scheduling an Advisory Committee meeting in a timely manner or, if convened, an FDA Advisory Committee could recommend non-approval,
conditions of approval or restrictions on approval, and the FDA may ultimately agree with the recommendations;
the relevant regulatory authority’s review process and decision-making regarding vadadustat and any other product candidate may be impacted by
the results of our and our competitors’ clinical trials and safety concerns of marketed products used to treat the same indications as the indications
for which vadadustat and any other product candidate are being developed;
the relevant regulatory authority may not approve the manufacturing processes or facilities of third party manufacturers with whom we contract; or
the policies or regulations of the relevant regulatory authority may significantly change in a manner that renders our clinical data insufficient for
approval or requires us to amend or submit new clinical protocols.

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If we experience further delays in obtaining approval, or if we fail to obtain approval of vadadustat for some or all of the indications for which we have
sought approval, the commercial prospects for vadadustat may be harmed and our ability to generate revenues will be materially impaired, which could
have a material adverse effect on our business. For example, the FDRR we submitted to the FDA in October 2022 focuses on the favorable balance
between the benefits and risks of vadadustat for the treatment of anemia due to CKD in adult patients on dialysis.

Products approved for marketing are subject to extensive post-marketing regulatory requirements and could be subject to post-marketing restrictions or
withdrawal from the market, and we may be subject to penalties, including withdrawal of marketing approval, if we fail to comply with regulatory
requirements or if we experience unanticipated problems with our products, or product candidates, when and if any of them is approved.

Marketing approvals may be subject to limitations on the approved indicated uses for which the product may be marketed or other conditions of approval,
or contain requirements or commitments for potentially costly post-marketing studies and surveillance to monitor the safety and efficacy of the product,
including REMS, or registries or observational studies. For example, in connection with the FDA approvals of Auryxia, we initially committed to the FDA
to conduct certain post-approval pediatric studies of Auryxia under the Pediatric Research Equity Act of 2003, or PREA. With regard to the
Hyperphosphatemia Indication for Auryxia, we committed to completing the post-approval pediatric study and submitting a final report to the FDA by
December 31, 2019. However, we did not complete the study and therefore did not submit the post-marketing requirement pediatric clinical study report by
December 31, 2019. Consequently, we received a notification of noncompliance with PREA. Our request to extend this deadline was denied, and the study
is considered delayed although we have initiated sites in the study and are recruiting for one patient cohort. Recruitment of the other patients is pending
receipt of further data regarding the manufacturing of the smaller size tablets and the FDA’s concurrence before proceeding with the use of such
formulation. With regard to our IDA Indication, we initially committed to completing the post-approval pediatric study and submitting a final report to the
FDA by January 2023. We did not meet a milestone relating to this post-approval pediatric study of Auryxia in a timely manner and received a notification
from the FDA. Subsequently, the FDA agreed to extend the pediatric clinical study timelines for the IDA Indication. We subsequently communicated to the
FDA that we would be delaying the start of the clinical trial in the IDA Indication while we work to produce smaller size tablets. In response, the FDA
issued a partial clinical hold until we manufacture the smaller tablets and provide the FDA with relevant information regarding the smaller sized tablets for
review. The FDA lifted the partial clinical hold in June 2022, however, we have not commenced start up of this study pending resolution of the
manufacturing of the smaller size tablets. If we are unable to complete these studies successfully, or have further delays in completing these studies, we will
need to inform the FDA, have further discussions and, if the FDA finds that we failed to comply with pediatric study requirements, in violation of
applicable law, it could institute enforcement proceedings to seize or enjoin the sale of Auryxia or seek civil penalties, which would have a material adverse
impact on our ability to commercialize Auryxia and our ability to generate revenues from Auryxia.

In addition, the manufacturing processes, labeling, packaging, distribution, adverse event reporting, storage, advertising, promotion and recordkeeping for
Auryxia, vadadustat, if approved, and any other product for which we receive regulatory approval will be subject to extensive and ongoing regulatory
requirements and guidance. These requirements and guidance include manufacturing processes and procedures (including record keeping), the
implementation and operation of quality systems to control and assure the quality of the product, submissions of safety and other post-marketing
information and reports, as well as continued compliance with cGMPs and GCPs for any clinical trials that we conduct post-approval. If we, our CMOs or
other third parties we engage fail to adhere to such regulatory requirements and guidance, we could suffer significant consequences, including product
seizures or recalls, loss of product approval, fines and sanctions, reputational damage, loss of customer confidence, shipment delays, inventory shortages,
inventory write-offs and other product-related charges and increased manufacturing costs, and our development or commercialization efforts may be
materially harmed.

Moreover, the FDA and other regulatory authorities closely regulate the post-approval marketing and promotion of drugs to ensure drugs are marketed only
for the approved indications and in accordance with the provisions of the approved labeling. The FDA and other regulatory authorities impose stringent
restrictions on companies’ communications regarding use of their products, and if we promote any approved product beyond its approved indications or
inconsistent with the approved label, we may be subject to enforcement actions or prosecution arising from such activities. Violations of the U.S. Federal
Food, Drug, and Cosmetic Act, or the FDCA, relating to the promotion of prescription drugs may lead to investigations alleging violations of federal and
state healthcare fraud and abuse and other laws, as well as state consumer protection laws, insurance fraud laws, third party payor actions, stockholder
actions and other lawsuits.

Post-approval discovery of previously unknown problems with an approved product, including adverse events of unanticipated severity or frequency or
relating to manufacturing operations or processes, or failure to comply with regulatory requirements, may result in, among other things:

restrictions on the marketing, distribution, use or manufacturing of the product;

•
• withdrawal of the product from the market, or product recalls;

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restrictions on the labeling or marketing of a product;
fines, restitution or disgorgement of profits or revenues;

•
•
• warning or untitled letters or clinical holds;
•

refusal by the FDA or other regulatory authorities to approve pending applications or supplements to approved applications filed by us, or
suspension or revocation of product approvals;
product seizure or detention, or refusal to permit the import or export of products;
REMS; and
injunctions or the imposition of civil or criminal penalties.

•
•
•

For example, we previously had three limited, voluntary recalls of Auryxia. These and any other recalls or any supply, quality or manufacturing issues in
the future could result in significant negative consequences, including reputational harm, loss of customer confidence, and a negative impact on our
financials, any of which could have a material adverse effect on our business and results of operations, and may impact our ability to supply Auryxia,
Vafseo

 in Japan or vadadustat, if approved, for commercial and clinical use.

TM,

Non-compliance with the FDA, the EMA, the PMDA and other regulatory authorities’ requirements regarding safety monitoring or pharmacovigilance can
also result in significant financial penalties.

The FDA’s policies and those of other regulatory authorities may change, and additional government regulations may be enacted. We cannot predict the
likelihood, nature or extent of government regulations that may arise from future legislation or administrative action, either in the United States or in other
jurisdictions. If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or are not able to
maintain regulatory compliance, we may lose any marketing approval that we may have obtained and we may not achieve or sustain profitability, which
would materially adversely affect our business.

Risks Related to Governmental Regulation and Compliance

We are subject to a complex regulatory scheme that requires significant resources to ensure compliance and our failure to comply with applicable laws
could  subject  us  to  government  scrutiny  or  enforcement,  potentially  resulting  in  costly  investigations,  fines,  penalties  or  sanctions,  contractual
damages, reputational harm, administrative burdens and diminished profits and future earnings.

In general, a variety of laws apply to us or may otherwise restrict our activities, including the following:

•

•

•

•
•
•
•

laws and regulations governing the conduct of preclinical studies and clinical trials in the United States and other countries in which we are
conducting such studies;
anti-corruption and anti-bribery laws, including the FCPA, the UK Bribery Act and various other anti-corruption laws in countries outside of the
United States;
data privacy laws existing in the United States, the EU, the UK and other countries in which we operate, including the U.S. Health Insurance
Portability and Accountability Act of 1996, or HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act,
or HITECH, state privacy and data protection laws, such as the California Consumer Privacy Act, or CCPA, and the California Privacy Rights Act
of 2020, or CPRA, as well as state consumer protection laws, GDPR, any additional applicable EU member state data protection laws in force
from time to time, the retained EU law version of the General Data Protection Regulation as saved into United Kingdom law by virtue of section 3
of the United Kingdom's European Union (Withdrawal) Act 2018, or the EU GDPR;
federal and state laws requiring the submission of accurate product prices and notifications of price increases;
federal and state securities laws;
environmental, health and safety laws and regulations; and
international trade laws, which are laws that regulate the sale, purchase, import, export, re-export, transfer and shipment of goods, products,
materials, services and technology.

In addition, our relationships with healthcare providers, physicians and third party payors expose us to broadly applicable fraud and abuse laws that may
constrain the business or financial arrangements and relationships through which we market, sell and distribute Auryxia and vadadustat, if approved, and
any other products for which we may obtain marketing approval. As such, these arrangements are subject to applicable anti-kickback, fraud and abuse,
false claims, transparency, health information privacy and security, and other healthcare laws and regulations at federal, state and international levels. These
restrictions include, but are not limited to, the following:

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•

•

•

•

the FDCA which among other things, strictly regulates drug product marketing and promotion and prohibits manufacturers from marketing such
products for off-label use;
federal laws that require pharmaceutical manufacturers to report certain calculated product prices to the government or provide certain discounts
or rebates to government authorities or private entities, often as a condition of reimbursement under government healthcare programs, and laws
requiring notification of price increases;
the  federal  Anti-Kickback  Statute,  which  prohibits,  among  other  things,  persons  from  knowingly  and  willfully  soliciting,  offering,  receiving  or
providing remuneration, directly or indirectly, in cash or in kind, to induce or reward, or in return for, either the referral of an individual for, or the
purchase, order or recommendation or arranging of, any good or service, for which payment may be made under a federal healthcare program such
as Medicare and Medicaid;
the federal False Claims Act, which imposes criminal and civil penalties, including through civil whistleblower or qui tam actions, against
individuals or entities for, among other things, knowingly presenting, or causing to be presented, false or fraudulent claims for payment by a
federal healthcare program or making a false statement or record material to payment of a false claim or avoiding, decreasing or concealing an
obligation to pay money to the federal government, with potential liability including mandatory treble damages and significant per-claim penalties,
and violations of the FDCA, the federal government pricing laws, and the federal Anti-Kickback Statute trigger liability under the federal False
Claims Act;

• HIPAA, which imposes criminal and civil liability for executing a scheme to defraud any healthcare benefit program or making false statements

relating to healthcare matters;

• HIPAA, as amended by the HITECH, and their respective implementing regulations, also imposes obligations, including mandatory contractual

•

•

terms, with respect to safeguarding the privacy, security and transmission of individually identifiable health information;
the federal Physician Payments Sunshine Act (renamed the Open Payments Act) requires applicable manufacturers of covered drugs to report
payments and other transfers of value to physicians, other healthcare providers and teaching hospitals, as well as ownership and investment
interests held by physicians and their immediate family members;
analogous state and foreign laws and regulations, such as state anti-kickback and false claims laws and gift ban and transparency statutes, which
may apply to sales or marketing arrangements and claims involving healthcare items or services reimbursed by state Medicaid or other programs,
or non-governmental third party payors, including private insurers, and which are not preempted by federal laws and often differ from state to
state, thus complicating compliance efforts; and

• U.S.  state  laws  restricting  interactions  with  healthcare  providers  and  other  members  of  the  healthcare  community  or  requiring  pharmaceutical

manufacturers to implement certain compliance standards, which vary from state to state.

Because of the breadth of these U.S. laws, and their non-U.S. equivalents, and the narrowness of the statutory exceptions and safe harbors available, it is
possible that some of our business activities could be subject to challenge under one or more of such laws. In addition, recent healthcare reforms have
strengthened these laws. For example, the Health Care Reform Act, among other things, amended the intent requirement of the federal Anti-Kickback
Statute. A person or entity no longer needs to have actual knowledge of the statute or specific intent to violate the law. The Health Care Reform Act also
amended the False Claims Act, such that violations of the Anti-Kickback Statute are now deemed violations of the False Claims Act.

Some state laws require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines, such as the
Pharmaceutical Research and Manufacturers of America Code on Interactions with Health Care Professionals, known as the PhRMA Code. Additionally,
some state and local laws require the registration of pharmaceutical sales representatives in the jurisdiction. State and foreign laws also govern the privacy
and security of health information in some circumstances, many of which differ from each other in significant ways and often are not preempted by
HIPAA.

Efforts to ensure that our business complies with applicable healthcare laws and regulations involves substantial costs and requires us to expend significant
resources. One of the potential areas for governmental scrutiny involves federal and state requirements for pharmaceutical manufacturers to submit accurate
price reports to the government. Because our processes for calculating applicable government prices and the judgments involved in making these
calculations involve subjective decisions and complex methodologies, these calculations are subject to risk of errors and differing interpretations. In
addition, they are subject to review and challenge by the applicable governmental agencies, or potential qui tam complaints, and it is possible that such
reviews could result in changes, recalculations, or defense costs that may have adverse legal or financial consequences. It is possible that governmental
authorities will conclude that our business practices may not comply with current or future statutes, regulations or case law involving applicable fraud and
abuse or other healthcare laws and regulations. If our operations are found to be in violation of any of these laws or any other governmental regulations that
may apply to us, we may be subject to significant civil, criminal and administrative penalties, damages, fines, imprisonment, exclusion of products from
government funded healthcare programs, such as Medicare and Medicaid, and the curtailment or restructuring of our operations, any of which could
materially adversely affect our business and would result in increased costs and diversion of management attention and could negatively impact the
development, regulatory approval and commercialization of Auryxia or vadadustat, any of which could have a material adverse effect on our business.
Further, if any of the physicians or other healthcare providers or entities with whom we expect to do business is found to be not in compliance with
applicable laws, they

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may be subject to criminal, civil or administrative sanctions, including exclusions from participation in government funded healthcare programs.

We will incur significant liability if it is determined that we are promoting any “off-label” use of Auryxia or any other product we may develop, in-
license or acquire or if it is determined that any of our activities violates the federal Anti-Kickback Statute.

Physicians are permitted to prescribe drug products for uses that differ from those approved by the FDA or other applicable regulatory agencies. Although
the FDA and other regulatory agencies do not regulate a physician’s choice of treatments, the FDA and other regulatory agencies do restrict manufacturer
communications regarding unapproved uses of an approved drug. Companies are not permitted to promote drugs for unapproved uses or in a manner that is
inconsistent with the FDA-approved labeling. There are also restrictions about making comparative or superiority claims based on safety or efficacy that
are not supported by substantial evidence. Accordingly, we may not promote Auryxia in the United States for use in any indications other than the
Hyperphosphatemia Indication and the IDA Indication, and all promotional claims must be consistent with the FDA-approved labeling for Auryxia.

Promoting a drug off-label is a violation of the FDCA and can give rise to liability under the federal False Claims Act, as well as under additional federal
and state laws and insurance statutes. The FDA, the Department of Justice and other regulatory and enforcement authorities enforce laws and regulations
prohibiting promotion of off-label uses and the promotion of products for which marketing approval has not been obtained, as well as the false advertising
or misleading promotion of drugs. In September 2021, the FDA published final regulations which describe the types of evidence that the agency will
consider in determining the intended use of a drug product. In addition, laws and regulations govern the distribution and tracing of prescription drugs and
prescription drug samples, including the Prescription Drug Marketing Act of 1976 and the Drug Supply Chain Security Act, which regulate the distribution
and tracing of prescription drugs and prescription drug samples at the federal level and set minimum standards for the regulation of drug distributors by the
states. A company that is found to have improperly promoted off-label uses or to have otherwise engaged in false or misleading promotion or improper
distribution of drugs will be subject to significant liability, potentially including civil and administrative remedies as well as criminal sanctions. It may also
be subject to exclusion and debarment from federal healthcare reimbursement programs.

Notwithstanding the regulatory restrictions on off-label promotion, the FDA and other regulatory authorities allow companies to engage in truthful, non-
misleading, and non-promotional scientific communications concerning their products in certain circumstances. In addition, under some relatively recent
guidance from the FDA, companies may also promote information that is consistent with the prescribing information and proactively speak to formulary
committee members of payors regarding data for an unapproved drug or unapproved uses of an approved drug. We intend to engage in these discussions
and communicate with healthcare providers, payors and other constituencies in compliance with all applicable laws, regulatory guidance and industry best
practices. Although we believe we have put in place a robust compliance program and processes designed to ensure that all such activities are performed in
a legal and compliant manner, such program and processes may not be sufficient to deter or detect all violations.

In addition, if a company’s activities are determined to have violated the federal Anti-Kickback Statute, this can also give rise to liability under the federal
False Claims Act and such violations can result in significant fines, criminal and civil remedies, and exclusion from Medicare and Medicaid. There is
increased government focus on relationships between the pharmaceutical industry and physicians, pharmacies (especially specialty pharmacies), and other
sources of referrals. Common industry activities, such as speaker programs, insurance assistance and support, relationships with foundations providing
copayment assistance, and relationships with patient organizations and patients are receiving increased governmental attention. If any of our relationships
or activities is determined to violate applicable federal and state anti-kickback laws, false claims laws, or other laws or regulations, the company and/or
company executives, employees, and other representatives could be subject to significant fines and criminal sanctions, imprisonment, and potential
exclusion from Medicare and Medicaid, and could harm our reputation or result in significant legal expenses and distraction of management.

Disruptions in the FDA, regulatory authorities outside the U.S. and other government agencies caused by global health concerns or funding shortages
could prevent new products and services from being developed or commercialized in a timely manner, which could negatively impact our business.

The ability of the FDA and regulatory authorities outside the U.S. to review and approve new products can be affected by a variety of factors, including
global health concerns, government budget and funding levels, staffing shortages, statutory, regulatory, and policy changes and other events that may
otherwise affect the FDA’s or other regulatory authorities' ability to perform routine functions. Average review times at the FDA have fluctuated in recent
years as a result of certain of these factors. In addition, government funding of other government agencies that fund research and development activities is
subject to the political process, which is inherently fluid and unpredictable. Disruptions at the FDA and other agencies may increase the time necessary for
new drugs to be reviewed or approved by necessary government agencies, which would adversely affect our

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business. If a prolonged government shutdown occurs, it could significantly impact the ability of the FDA or other regulatory authorities to timely review
and process our, or our collaboration partners', regulatory submissions, which could have a material adverse effect on our business.

In response to the COVID-19 pandemic, a number of companies in 2020 and 2021 announced receipt of complete response letters due to the FDA’s
inability to complete required inspections for their applications. Following a period of false starts, and temporary suspensions due to the omicron variant,
the FDA announced on February 2, 2022 that it would resume domestic inspections beginning on February 7, 2022, and indicated that it would conduct
foreign inspections beginning in April 2022 on a prioritized basis. However, the FDA may not be able to continue its current pace and review timelines
could be extended, including where a pre-approval inspection or an inspection of clinical sites is required and due to the COVID-19 pandemic and/or any
travel restrictions, the FDA is unable to complete such required inspections during the review period. Regulatory authorities outside the United States may
also impose similar restrictions or other policy measures in response to the COVID-19 pandemic or other travel restrictions. If a prolonged government
shutdown occurs, or if global health concerns prevent the FDA or other regulatory authorities from conducting their regular inspections, reviews, or other
regulatory activities, it could significantly impact the ability of the FDA or other regulatory authorities to timely review and process our regulatory
submissions, which could have a material adverse effect on our business.

Compliance with privacy and data security requirements could result in additional costs and liabilities to us or inhibit our ability to collect and process
data globally, and the failure to comply with such requirements could subject us to significant fines and penalties, which may have a material adverse
effect on our business, financial condition or results of operations.

The regulatory framework for the collection, use, safeguarding, sharing, transfer and other processing of information worldwide is rapidly evolving and is
likely to remain uncertain for the foreseeable future. Globally, virtually every jurisdiction in which we operate has established its own data security and
privacy frameworks with which we must comply. For example, the collection, use, disclosure, transfer, or other processing of personal data regarding
individuals in the EU, including personal health data, is subject to the GDPR, which took effect across all member states of the EEA, in May 2018.
Following the withdrawal of the U.K. from the EU, the U.K. Data Protection Act 2018 applies to the processing of personal data that takes place in the
U.K. and includes parallel obligations to those set forth by GDPR. The GDPR is wide-ranging in scope and imposes numerous requirements on companies
that process personal data when required, including requirements relating to processing health and other sensitive data, obtaining consent of the individuals
to whom the personal data relates, when required, providing information to individuals regarding data processing activities, implementing safeguards to
protect the security and confidentiality of personal data, providing notification of data breaches, and taking certain measures when engaging third party
processors. The GDPR increases our obligations as a sponsor in clinical trials in the EEA by expanding the definition of personal data to include coded data
and requiring changes to informed consent practices and more detailed notices for clinical trial patients and investigators. The GDPR also permits data
protection authorities to require destruction of improperly gathered or used personal information and/or impose substantial fines for violations of the
GDPR, which can be up to four percent of global revenues or 20 million Euros, whichever is greater, and it also confers a private right of action on data
subjects and consumer associations to lodge complaints with supervisory authorities, seek judicial remedies, and obtain compensation for damages
resulting from violations of the GDPR. In addition, the GDPR provides that EU member states may make their own further laws and regulations limiting
the processing of personal data, including genetic, biometric or health data and permits EU member states to adopt further penalties for violations that are
not subject to the administrative fines outlined in the GDPR.

The GDPR also imposes strict rules on the transfer of personal data to countries outside the EU, including the United States and, as a result, increases the
scrutiny that we should apply to transfers of personal data from such sites to countries that are considered to lack an adequate level of data protection, such
as the United States. There is ongoing uncertainty about the transfer mechanisms that companies rely upon to enable the legal transfer of personal data from
the EU to other countries. For example, in July 2020, the Court of Justice of the European Union, or the CJEU, invalidated the EU-U.S. Privacy Shield, one
of the mechanisms used to legitimize the transfer of personal data from the EEA to the U.S. As court decisions and regulatory guidance evolves, challenges
remain with respect to GDPR compliance. Companies must continue to monitor the regulatory landscape and implement necessary changes, all of which
may be costly and may put the company out of compliance while any changes are being implemented.

Given the breadth and depth of changes in data protection obligations, complying with the GDPR’s requirements is rigorous and time intensive and requires
significant resources and a review of our technologies, systems and practices, as well as those of any third party collaborators, service providers,
contractors or consultants that process or transfer personal data collected in the EU. The GDPR and other changes in laws or regulations associated with the
enhanced protection of certain types of sensitive data, such as healthcare data or other personal information from our clinical trials, could require us to
change our business practices and put in place additional compliance mechanisms, may interrupt or delay our development, regulatory and
commercialization activities and increase our cost of doing business, and could lead to government enforcement actions, private

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litigation and significant fines and penalties against us and could have a material adverse effect on our business, financial condition or results of operations.

Similar privacy and data security requirements are either in place or underway in the United States. There are a broad variety of data protection laws that
may be applicable to our activities, and a range of enforcement agencies at both the state and federal levels that can review companies for privacy and data
security concerns. The Federal Trade Commission and state Attorneys General all are aggressive in reviewing privacy and data security protections for
consumers. New laws also are being considered at both the state and federal levels. For example, the CCPA, which went into effect on January 1, 2020, and
the CPRA, which amends CCPA by expanding the scope and applicability, while also introducing new privacy protections, is creating similar risks and
obligations as those created by GDPR. The CPRA also creates a new agency that is specifically responsible for enforcing the new law. Because of this, we
may need to engage in additional activities (e.g., data mapping) to identify the personal information we are collecting and the purposes for which such
information is collected. In addition, we will need to ensure that our policies recognize the rights granted to consumers (as that phrase is broadly defined in
the CCPA and can include business contact information). Other states have also passed privacy laws that are similar to the CCPA/CPRA, including
Virginia, Colorado, Connecticut, and Utah. The laws in the various states vary in terms of their exact requirements, but they all provide regulators in these
states with enforcement authority. Many other states are considering similar legislation. A broad range of legislative measures also have been introduced at
the federal level. Accordingly, failure to comply with current and any future federal and state laws regarding privacy and security of personal information
could expose us to fines and penalties. We also face a threat of potential consumer class actions related to these laws and the overall protection of personal
data. Even if we are not determined to have violated these laws, investigations into these issues typically require the expenditure of significant resources
and generate negative publicity, which could harm our reputation and our business.

Legislative and regulatory healthcare reform may increase the difficulty and cost for us to obtain marketing approval of and commercialize our product
candidates and affect the prices we may obtain for any products that are approved in the United States or foreign jurisdictions.

In the United States and some foreign jurisdictions, there have been a number of legislative and regulatory changes and proposed changes regarding the
healthcare system that could prevent or delay marketing approval of vadadustat, or any other product candidate, restrict or regulate post-approval activities
and affect our ability to profitably sell Auryxia and vadadustat, if approved. The pharmaceutical industry has been a particular focus of these efforts and has
been significantly affected by legislative initiatives. Current laws, as well as other healthcare reform measures that may be adopted in the future, may result
in more rigorous coverage criteria and in additional downward pressure on the price that we receive for any FDA approved product, such as Auryxia or
vadadustat, if approved, or any reimbursement that physicians receive for administering any approved product.

In the United States, the Medicare Prescription Drug, Improvement, and Modernization Act of 2003, or the MMA, changed the way Medicare covers and
pays for pharmaceutical products. The legislation expanded Medicare coverage for drug purchases by the elderly and introduced a new reimbursement
methodology based on average sales prices for physician-administered drugs. In addition, this legislation provided authority for limiting the number of
drugs that will be covered in any therapeutic class. Cost reduction initiatives and other provisions of this legislation could decrease the coverage and price
that we receive for Auryxia and any other approved products. While the MMA applies only to drug benefits for Medicare beneficiaries, private payors
often follow Medicare coverage policy and payment limitations in setting their own reimbursement rates. Therefore, any reduction in reimbursement that
results from the MMA may result in a similar reduction in payments from private payors.

In March 2010, President Obama signed into law the Patient Protection and Affordable Care Act, as amended by the Health Care and Education
Reconciliation Act of 2010, or, collectively, the ACA. In addition, other legislative changes and regulatory have been proposed and adopted since the ACA
was enacted. These changes include the Budget Control Act of 2011, which, among other things, led to aggregate reductions to Medicare payments to
providers of up to 2% per fiscal year, which will remain in effect through 2031. However, pursuant to the Coronavirus Aid, Relief, and Economic Security
Act, or the CARES Act, and subsequent legislation, these Medicare sequester reductions were suspended and reduced through the end of June 2022 but
with the full 2% cut resuming as of July 1, 2022. The American Taxpayer Relief Act of 2012, which, among other things, reduced Medicare payments to
several types of providers and increased the statute of limitations period for the government to recover overpayments to providers from three to five years.
In addition, other legislative and regulatory changes have been proposed, but not yet adopted. For example, in July 2019, HHS proposed regulatory changes
in kidney health policy and reimbursement. Any new legislative or regulatory changes may result in additional reductions in Medicare and other healthcare
funding and otherwise affect the prices we may obtain for Auryxia or vadadustat, if approved, or the frequency with which Auryxia and vadadustat, if
approved, is prescribed or used.

The costs and prices of prescription pharmaceuticals have also been the subject of considerable discussion in the United States. To date, there have been
several recent U.S. congressional inquiries and proposed and enacted state and federal legislation designed to, among other things, bring more transparency
to  drug  pricing,  review  the  relationship  between  pricing  and  manufacturer  patient  programs,  reduce  the  costs  of  drugs  under  Medicare  and  reform
government program reimbursement

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methodologies  for  drug  products.  At  the  federal  level,  Congress  and  the  current  administration  have  each  indicated  that  it  will  continue  to  seek  new
legislative and/or administrative measures to control drug costs.

For example, the former administration issued several executive orders intended to lower the costs of prescription products and certain provisions in these
orders have been incorporated into regulations. These regulations include an interim final rule implementing a most favored nation model for prices that
would tie Medicare Part B payments for certain physician-administered pharmaceuticals to the lowest price paid in other economically advanced countries,
effective January 1, 2021. That rule, however, has been subject to a nationwide preliminary injunction and, on December 29, 2021, CMS issued a final rule
to rescind it. With issuance of this rule, CMS stated that it will explore all options to incorporate value into payments for Medicare Part B pharmaceuticals
and improve beneficiaries' access to evidence-based care.

At the same time, the administration may seek to limit Medicare Part D and public option drug prices through a tax penalty on manufacturers for increases
in the cost of drugs and biologics above the general inflation rate. The American Rescue Plan Act of 2021, comprehensive COVID-19 pandemic relief
legislation recently enacted under the current administration, includes a number of healthcare-related provisions, such as support to rural health care
providers, increased tax subsidies for health insurance purchased through insurance exchange marketplaces, financial incentives to states to expand
Medicaid programs and elimination of the Medicaid drug rebate cap effective in 2024.

Further, on July 9, 2021, President Biden signed Executive Order 14063, which focuses on, among other things, the price of pharmaceuticals. The Order
directs HHS to create a plan within 45 days to combat “excessive pricing of prescription pharmaceuticals and enhance domestic pharmaceutical supply
chains, to reduce the prices paid by the federal government for such pharmaceuticals, and to address the recurrent problem of price gouging.” On
September 9, 2021, HHS released its plan to reduce pharmaceutical prices. The key features of that plan are to: (a) make pharmaceutical prices more
affordable and equitable for all consumers and throughout the health care system by supporting pharmaceutical price negotiations with manufacturers; (b)
improve and promote competition throughout the prescription pharmaceutical industry by supporting market changes that strengthen supply chains,
promote biosimilars and generic drugs, and increase transparency; and (c) foster scientific innovation to promote better healthcare and improve health by
supporting public and private research and making sure that market incentives promote discovery of valuable and accessible new treatments.

More recently, on August 16, 2022, the Inflation Reduction Act of 2022, or IRA, was signed into law by President Biden. The new legislation has
implications for Medicare Part D, which is a program available to individuals who are entitled to Medicare Part A or enrolled in Medicare Part B to give
them the option of paying a monthly premium for outpatient prescription drug coverage. Among other things, the IRA requires manufacturers of certain
drugs to engage in price negotiations with Medicare (beginning in 2026), with prices that can be negotiated subject to a cap; imposes rebates under
Medicare Part B and Medicare Part D to penalize price increases that outpace inflation (first due in 2023); and replaces the Part D coverage gap discount
program with a new discounting program (beginning in 2025). The IRA permits the Secretary of HHS to implement many of these provisions through
guidance, as opposed to regulation, for the initial years.

Specifically, with respect to price negotiations, Congress authorized Medicare to negotiate lower prices for certain costly single-source drug and biologic
products that do not have competing generics or biosimilars and are reimbursed under Medicare Part B and Part D. CMS may negotiate prices for ten high-
cost drugs paid for by Medicare Part D starting in 2026, followed by 15 Part D drugs in 2027, 15 Part B or Part D drugs in 2028, and 20 Part B or Part D
drugs in 2029 and beyond. This provision applies to drug products that have been approved for at least 9 years and biologics that have been licensed for 13
years, but it does not apply to drugs and biologics that have been approved for a single rare disease or condition. Further, the legislation subjects drug
manufacturers to civil monetary penalties and a potential excise tax for failing to comply with the legislation by offering a price that is not equal to or less
than the negotiated “maximum fair price” under the law or for taking price increases that exceed inflation. The legislation also requires manufacturers to
pay rebates for drugs in Medicare Part D whose price increases exceed inflation. The new law also caps Medicare out-of-pocket drug costs at an estimated
$4,000 a year in 2024 and, thereafter beginning in 2025, at $2,000 a year.

At the state level, individual states are increasingly aggressive in passing legislation and implementing regulations designed to control pharmaceutical and
biological product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access, marketing cost disclosure
and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing. A number of states, for
example, require drug manufacturers and other entities in the drug supply chain, including health carriers, pharmacy benefit managers, wholesale
distributors, to disclose information about pricing of pharmaceuticals. In addition, regional healthcare authorities and individual hospitals are increasingly
using bidding procedures to determine what pharmaceutical products and which suppliers will be included in their prescription drug and other healthcare
programs. These measures could reduce the ultimate demand for our products or put pressure on our product pricing.

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It is likely that federal and state legislatures within the United States and foreign governments will continue to consider changes to existing healthcare
legislation. We expect that additional state and federal healthcare reform measures will be adopted in the future, any of which could limit the amounts that
federal and state governments will pay for healthcare products and services, which could result in reduced demand for Auryxia and any product candidates
for which we receive marketing approval or additional pricing pressures. We cannot predict the reform initiatives that may be adopted in the future or
whether initiatives that have been adopted will be repealed or modified. The continuing efforts of the government, insurance companies, managed care
organizations and other payors of healthcare services to contain or reduce costs of healthcare may adversely affect:

•
•
•
•
•

the demand for Auryxia and any products candidates for which we receive marketing approval;
our ability to set a price that we believe is fair for our products;
our ability to obtain and maintain coverage and reimbursement approval for Auryxia or any other approved product;
our ability to generate revenues and achieve or maintain profitability; and
the level of taxes that we are required to pay.

In addition, in some countries, including member states of the EU the pricing of prescription pharmaceuticals is subject to governmental control. In these
countries, pricing negotiations with governmental authorities can take a significant amount of time after receipt of marketing approval for a product. In
addition, there can be considerable pressure by governments and other stakeholders on prices and reimbursement levels, including as part of cost
containment measures. Political, economic and regulatory developments may further complicate pricing negotiations, and pricing negotiations may
continue after reimbursement has been obtained. Reference pricing used by various EU member states and parallel distribution, or arbitrage between low-
priced and high-priced member states, can further reduce prices, and in certain instances render commercialization in certain markets infeasible or
disadvantageous from a financial perspective. In some countries, we or our collaborators may be required to conduct a clinical trial or other studies that
compare the cost-effectiveness of our product and/or our product candidates to other available products in order to obtain or maintain reimbursement or
pricing approval. Publication of discounts by third party payors or government authorities may lead to further pressure on the prices or reimbursement
levels. If reimbursement of our products is unavailable or limited in scope or amount, or if pricing is set at unsatisfactory levels, the commercial launch of
our product and/or product candidates could be delayed, possibly for lengthy periods of time, we or our collaborators may not launch at all in a particular
country, we may not be able to recoup our investment in one or more product candidates, and there could be a material adverse effect on our business.

If we fail to comply with environmental, health and safety laws and regulations, we could become subject to fines or penalties or incur costs that could
harm our business.

We are subject to numerous environmental, health and safety laws and regulations, including those governing laboratory procedures and the handling, use,
storage, treatment and disposal of hazardous materials and wastes. Our operations involve the use of hazardous and flammable materials, including
chemicals and biological materials. Our operations also produce hazardous waste products. We generally contract with third parties for the use and disposal
of these materials and wastes. We cannot eliminate the risk of contamination or injury from these materials. In the event of contamination or injury
resulting from the use of hazardous materials by our employees, contractors or consultants, we could be held liable for any resulting damages, and any
liability could exceed our resources. We also could incur significant costs associated with civil or criminal fines and penalties for failure to comply with
such laws and regulations.

Although we maintain workers’ compensation insurance to cover us for costs and expenses, we may incur due to injuries to our employees resulting from
the use of hazardous materials, this insurance may not provide adequate coverage against potential liabilities. We do not maintain insurance for
environmental liability or toxic tort claims that may be asserted against us in connection with our storage or disposal of biological, hazardous or radioactive
materials.

In addition, we may incur substantial costs in order to comply with current or future environmental, health and safety laws and regulations. These current or
future laws and regulations may impair our research, development or production efforts. Our failure to comply with these laws and regulations also may
result in substantial fines, penalties or other sanctions.

Risks Related to our Reliance on Third Parties

We depend on collaborations with third parties for the development and commercialization of Auryxia, Riona, Vafseo and vadadustat and if these
collaborations are not successful or if our collaborators terminate their agreements with us, we may not be able to capitalize on the market potential of
Auryxia, Riona, Vafseo and vadadustat, and our business could be materially harmed.

We sublicensed the rights to commercialize Riona to JT and Torii in Japan. We also entered into a collaboration agreement with MTPC to develop and
commercialize vadadustat in Japan and certain other Asian countries. In addition, we entered into the Vifor Second Amended Agreement pursuant to which
we granted CSL Vifor an exclusive license to sell vadadustat to the Supply Group in the United States. We also granted to Averoa an exclusive license to
develop and commercialize ferric citrate

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in the EEA, Turkey, Switzerland and the United Kingdom. We may form or seek other strategic alliances, joint ventures, or collaborations, or enter into
additional licensing arrangements with third parties that we believe will complement or augment our and our partners' commercialization efforts with
respect to Auryxia, Riona, Vafseo and our and our partners' development and, if approved, commercialization efforts with respect to vadadustat and any
other product candidates. We may not be able to maintain our collaborations for development and commercialization. For example, on May 13, 2022,
Otsuka elected to terminate our collaboration agreements with them, and we subsequently negotiated the Termination Agreement with Otsuka. This
termination by Otsuka may delay the approval or launch of vadadustat in Europe or other territories or adversely affect how we are perceived in scientific
and financial communities. In addition, our current and any future collaborations may not be successful due to a number of important factors, including the
following:

•
•

•

•

•
•

•

•

•

•

collaborators may have significant discretion in determining the efforts and resources that they will apply to these collaborations;
collaborations may be terminated in accordance with the terms of the collaboration agreements and, if terminated, may make it difficult for us to
attract new collaborators or adversely affect how we are perceived in scientific and financial communities, and may result in a need for additional
capital and expansion of our internal capabilities to pursue further development or commercialization of the applicable products and product
candidates;
if permitted by the terms of the collaboration agreements, collaborators may elect not to continue or renew development or commercialization
programs based on clinical trial results, changes in their strategic focus, availability of funding or other external factors such as a business
combination that diverts resources or creates competing priorities;
if permitted by the terms of the collaboration agreements, collaborators may delay clinical trials, provide insufficient funding for a clinical trial
program, stop a clinical trial, abandon a product candidate, repeat or conduct new clinical trials or require a new formulation of a product
candidate for clinical testing;
a collaborator with marketing and distribution rights to our products may not commit sufficient resources to their marketing and distribution;
if permitted by the terms of the collaboration agreements, we and our collaborator may have a difference of opinion regarding the development or
commercialization strategy for a particular product or product candidate, and our collaborator may have ultimate decision making authority;
disputes may arise between a collaborator and us that cause the delay or termination of activities related to research, development, supply or
commercialization of Auryxia, Riona, Vafseo or vadadustat and any other product candidate, or that result in costly litigation or arbitration that
diverts management attention and resources;
collaborations may not lead to development or commercialization of products and product candidates, if approved, in the most efficient manner or
at all;
a significant change in the senior management team, a change in the financial condition or a change in the business operations, including a change
in control or internal corporate restructuring, of any of our collaborators, could result in delayed timelines, re-prioritization of our programs,
decreasing resources or funding allocated to support our programs, or termination of the collaborations; and
collaborators may not comply with all applicable regulatory and legal requirements.

If any of these events occurs, the market potential of Auryxia, Riona, Vafseo or vadadustat, if and where approved, and any other products or product
candidates, could be reduced, and our business could be materially harmed. Collaborations may also divert resources, including the attention of
management and other employees, from other parts of our business, which could have an adverse effect on other parts of our business, and we cannot be
certain that the benefits of the collaboration will outweigh the potential risks.

We may seek to establish additional collaborations and, if we are not able to establish them on commercially reasonable terms, or at all, we may have to
alter our development and commercialization plans.

We will require substantial additional cash to fund the continued commercialization of Auryxia and the development and potential commercialization of
any of our product candidates, including vadadustat, if approved, especially following the termination of our collaboration agreements with Otsuka. We
may decide to enter into additional collaborations for the development and commercialization of vadadustat or Auryxia, both within and outside of the
United States. For example, we plan to pursue a new partner to develop and commercialize vadadustat in Europe and other territories previously licensed to
Otsuka. If we are unsuccessful in entering into a new agreement for the development and commercialization of vadadustat in Europe and other territories in
a timely manner, or at all, it may result in a delay in the approval or launch of vadadustat in Europe or other territories, a need for additional capital and
expansion of our internal capabilities to pursue further development or commercialization of the applicable products and product candidates, particularly
the development and commercialization of vadadustat in Europe and other territories, and could have an adverse effect on our results of operations. Any of
these relationships may require us to incur non-recurring and other charges, increase our near and long-term expenditures, issue securities that dilute our
existing stockholders, divert management’s attention, or disrupt our business.

We may not be successful in entering into additional collaborations as a result of many factors, including the following:

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•
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•
•
•
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•

competition in seeking appropriate collaborators;
a reduced number of potential collaborators due to recent business combinations in the pharmaceutical industry;
an inability to negotiate collaborations on acceptable terms, on a timely basis or at all;
any international rules, regulations, guidance, laws, risks or uncertainties with respect to potential partners outside of the United States;
a potential collaborator’s evaluation of Auryxia, vadadustat or any other product or product candidate may differ substantially from ours;
a potential collaborator’s evaluation of our financial stability and resources;
a potential collaborator’s resources and expertise; and
restrictions due to an existing collaboration agreement.

If we are unable to enter into additional collaborations in a timely manner, or at all, we may have to delay or curtail the commercialization of Auryxia or
vadadustat, if and where approved, reduce or delay its development program or other of our other development programs, or increase our expenditures and
undertake additional development or commercialization activities at our own expense. If we elect to increase our expenditures to fund development or
commercialization activities on our own, we may need to obtain additional capital, which may not be available to us on acceptable terms or at all. If we do
not have sufficient funds, we may not be able to further develop or commercialize Auryxia or vadadustat, if approved.

Even if we enter into additional collaboration agreements and strategic partnerships or license our intellectual property, we may not be able to maintain
them or they may be unsuccessful, which could delay our timelines or otherwise adversely affect our business.

Royalties from commercial sales of vadadustat under our MTPC Agreement will likely fluctuate and will impact our rights to receive future payments
under our Royalty Agreement with HCR.

Pursuant to the Royalty Agreement with HCR, we sold to HCR our right to receive the Royalty Interest Payments payable to us under the MTPC
Agreement, subject to the Annual Cap and the Aggregate Cap. After HCR receives Royalty Interest Payments equal to the Annual Cap in a given calendar
year, we will receive 85% of the Royalty Interest Payments for the remainder of that year. After HCR receives Royalty Interest Payments equal to the
Aggregate Cap, or we pay the Aggregate Cap to HCR (net of the Royalty Interest Payments already received by HCR), the Royalty Interest Payments will
revert back to us, and HCR would have no further right to any Royalty Interest Payments. We received $44.8 million from HCR (net of certain transaction
expenses) under the Royalty Agreement, and we are eligible to receive up to an additional $15.0 million under the Royalty Agreement if specified sales
milestones are achieved for vadadustat in the territory covered by the MTPC Agreement, subject to the satisfaction of certain customary conditions.

The royalty revenues under the MTPC Agreement may fluctuate considerably because they depend upon, among other things, the rate of growth of sales of
vadadustat in the territory covered by the MTPC Agreement. Negative fluctuations in these royalty revenues could delay, diminish or eliminate our right to
receive up to the additional $15.0 million under the Royalty Agreement upon achievement of the specified sales milestones, our ability to receive 85% of
the Royalty Interest Payments after the Annual Cap is achieved in a given calendar year, or our ability to receive 100% of the Royalty Interest Payments
after the Aggregate Cap is achieved.

We rely upon third parties to conduct all aspects of our product manufacturing, and in many instances only have a single supplier, and the loss of these
manufacturers, their failure to supply us on a timely basis, or at all, or their failure to successfully carry out their contractual duties or comply with
regulatory requirements, cGMP requirements, or guidance could cause delays in or disruptions to our supply chain and substantially harm our
business.

We do not have any manufacturing facilities and do not expect to independently manufacture any product or product candidates. We currently rely, and
expect to continue to rely, on third party manufacturers to produce all of our commercial, clinical and preclinical supply. Our reliance on third party
manufacturers, who have control over the manufacturing process, increases the risk that we will not have or be able to maintain sufficient quantities of
Auryxia and vadadustat or the ability to obtain such quantities at an acceptable cost or quality, which could delay, prevent or impair our and our partners'
development or commercialization efforts.

We currently rely on a single source supplier for each of Auryxia drug substance and drug product and vadadustat drug substance and drug product, and
alternate sources of supply may not be readily available. If any of the following occurs, we may not have sufficient quantities of Auryxia and/or vadadustat
to support our clinical trials, development, commercialization,

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or obtaining and maintaining marketing approvals, which could materially and adversely impact our business and results of operations:

• we are unsuccessful in maintaining our current supply arrangements for commercial quantities of Auryxia and vadadustat;
• we are unsuccessful in validating new sites;
•
•

our commercial supply arrangements for Auryxia or vadadustat are terminated;
any of our third party manufacturers are unable to fulfill the terms of their agreements with us, including with respect to quality and quantity, or
are unable or unwilling to continue to manufacture on the manufacturing lines included in our regulatory filings; or
any of our third party manufacturers breach our supply agreements, do not comply with quality or regulatory requirements and guidance, including
cGMP or are subject to regulatory review or ceases their operations for any reason.

•

If any of our third party manufacturers cannot or do not perform as agreed or expected, including as a result of catastrophic events, including pandemics,
including the COVID-19 pandemic, terrorist attacks, wars or other armed conflicts, geopolitical tensions or natural disasters, if they misappropriate our
proprietary information, if they terminate their engagements with us, if we terminate our engagements with them, or if there is a significant disagreement,
we may be forced to manufacture the materials ourselves, for which we currently do not have the capabilities or resources, or enter into agreements with
other third party manufacturers, which we may not be able to do in a timely manner or on favorable or reasonable terms, if at all. For example, one of our
manufacturers has notified us that it will be discontinuing operations at one site at a future date. In some cases, there may be a limited number of qualified
replacement manufacturers, or the technical skills or equipment required to manufacture a product or product candidate may be unique or proprietary to the
original manufacturer and we may have difficulty transferring such skills or technology to another third party, or a feasible alternative may not exist. These
factors would increase our reliance on our current manufacturers or require us to obtain necessary regulatory approvals and licenses in order to have
another third party manufacture Auryxia or vadadustat. If we are required to change manufacturers for any reason, we will be required to verify that the
new manufacturer maintains facilities and procedures that comply with quality standards and with all applicable regulations and guidelines. The delays and
costs associated with the qualification of a new manufacturer and validation of manufacturing processes would negatively affect our ability to supply
clinical trials, obtain and maintain marketing approval, or commercialize or satisfy patient demand for Auryxia and vadadustat, where approved, in a timely
manner, within budget, or at all.

In addition, the cost of obtaining Auryxia and vadadustat is subject to adjustment based on our third party manufacturers’ costs of obtaining raw materials
and producing the product. We have limited control over the production costs of Auryxia and vadadustat, including the costs of raw materials, and have
seen increases in the production costs of Auryxia and vadadustat, and any significant increase in the cost of obtaining our products could materially
adversely affect our revenue for Auryxia and vadadustat, if approved.

Moreover, issues that may arise in any scale-up and technology transfer and continued commercial scale manufacture of our products may lead to
significant delays in our development, marketing approval and commercial timelines and negatively impact our financial performance. For example, a
production-related issue resulted in an interruption in the supply of Auryxia in the third and fourth quarters of 2016. This supply interruption negatively
impacted Keryx’s revenues in 2016. This supply interruption was resolved, and we have taken and continue to take actions designed to prevent future
interruptions in the supply of Auryxia. However, we recently experienced issues in manufacturing Auryxia, and if we continue to experience manufacturing
issues or our actions to prevent future interruptions are not successful, we may experience additional supply issues. In addition, before we can manufacture
product at a new site, we must validate the process at that site. If the process validation is unsuccessful, or takes longer than we anticipate, we may have to
expend additional resources and could experience a supply interruption. Any future supply interruptions, whether quality or quantity based, for Auryxia or
vadadustat, if and where approved, would negatively and materially impact our reputation and financial condition.

There are a limited number of manufacturers that are capable of manufacturing Auryxia and vadadustat for us and complying with cGMP regulations and
guidance and other stringent regulatory requirements and guidance enforced by the FDA, EMA, PMDA and other regulatory authorities. These
requirements include, among other things, quality control, quality assurance and the maintenance of records and documentation, which occur in addition to
our own quality assurance releases. The facilities and processes used by our third party manufacturers to manufacture Auryxia may be inspected by the
FDA and other regulatory authorities at any time, and the facilities and processes used by our third party manufacturers to manufacture vadadustat will be
inspected by the FDA, the EMA and other regulatory authorities prior to or after we submit our marketing applications. Although we have general visibility
into the manufacturing processes of our third party manufacturers, we do not ultimately control such manufacturing processes of, and have little control
over, our third party manufacturers, including, without limitation, their compliance with cGMP requirements and guidance for the manufacture of certain
starting materials, drug substance and finished drug product. Similarly, although we review final production, we have little control over the ability of

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our third party manufacturers to maintain adequate quality control, quality assurance and qualified personnel. Our third party manufacturers may
experience problems with their manufacturing and distribution operations and processes, including, for example, quality issues, such as product
specification and stability failures, procedural deviations, improper equipment installation or operation, utility failures, contamination, natural disasters and
public health epidemics. We may also encounter difficulties relating to our own quality processes and procedures, including regulatory compliance, lot
release, quality control and quality assurance, as well as shortages of qualified personnel. If our third party manufacturers cannot successfully manufacture
material that conforms to our specifications and regulatory requirements and guidance, or if we or our third party manufacturers experience manufacturing,
operations and/or quality issues, including an inability or unwillingness to continue manufacturing our products at all, in accordance with agreed-upon
processes or on currently validated manufacturing lines, we may not be able to supply patient demand or maintain marketing approval for Auryxia, secure
and maintain marketing approval for vadadustat, and we might be required to expend additional resources to obtain material from other manufacturers. If
any of these events occur, our reputation and financial condition would be negatively and materially impacted. In addition, during the year ended December
31, 2022, we had higher write-downs to inventory reserves related to Auryxia drug substance that will not be forward processed into drug product. If we
have additional write-downs to inventory reserves in the future, it could negatively impact our ability to supply Auryxia, and our financial condition could
be harmed.

If the FDA, the EMA or other regulatory authorities do not approve the facilities being used to manufacture vadadustat, or if they withdraw any approval of
the facilities being used to manufacture Auryxia or vadadustat, we may need to find alternative manufacturing facilities, which would significantly impact
our ability to continue commercializing Auryxia or Vafseo in Japan, or develop, obtain marketing approval for or market vadadustat or our other product
candidates, if approved.

Moreover, our failure or the failure of our third party manufacturers to comply with applicable regulations or guidance, or our failure to oversee or facilitate
such compliance, could result in sanctions being imposed on us or our third party manufacturers, including, where applicable, clinical holds, fines,
injunctions, civil penalties, delays in, suspension of or withdrawal of approvals, license revocation, seizures or recalls of Auryxia or Vafseo in Japan,
operating restrictions, receipt of a Form 483 or warning letter, or criminal prosecutions, any of which could significantly and adversely affect the supply of
Auryxia or vadadustat. For example, we previously conducted three limited, voluntary recalls of Auryxia. These and any other recalls or any supply, quality
or manufacturing issues in the future and any related write-downs of inventory or other consequences could result in significant negative consequences,
including reputational harm, loss of customer confidence, and a negative impact on our financials, any of which could have a material adverse effect on our
business and results of operations, and may impact our ability to supply Auryxia, Vafseo in Japan or vadadustat for clinical and commercial use. Also, if
our starting materials, drug substance or drug product are damaged or lost while in our or our third party manufacturers’ control, it may adversely impact
our ability to supply Auryxia or vadadustat, and we may incur significant financial harm.

In addition, Auryxia and vadadustat may compete with other products and product candidates for access to third party manufacturing facilities. A third
party manufacturer may also encounter delays or operational issues brought on by sudden internal resource constraints, labor disputes, shifting priorities or
shifting regulatory protocols including, in each case, relating to the COVID-19 pandemic. Certain of these third party manufacturing facilities may be
contractually prohibited from manufacturing Auryxia or vadadustat due to exclusivity provisions in agreements with our competitors. Any of the foregoing
could negatively impact our third party manufacturers' ability to meet our demand, which could adversely impact our ability to supply Auryxia or
vadadustat, and we may incur significant financial harm.

Our current and anticipated future dependence on third parties for the manufacture of Auryxia and vadadustat may adversely affect our and our partners'
ability to commercialize Auryxia and vadadustat, where approved, on a timely and competitive basis and may reduce any future profit margins.

We rely upon third parties to conduct our clinical trials and certain of our preclinical studies. If they do not successfully carry out their contractual
duties, comply with regulatory requirements or meet expected deadlines, we may not be able to obtain or maintain marketing approval for Auryxia,
vadadustat or any of our product candidates, and our business could be substantially harmed.

We do not have the ability to independently conduct certain preclinical studies and clinical trials. We are currently relying, and expect to continue to rely,
upon third parties, such as CROs, clinical data management organizations, medical institutions and clinical investigators, to conduct our current and future
preclinical studies and clinical trials. The third parties upon whom we rely may fail to perform effectively, or terminate their engagement with us, for a
number of reasons, including the following:

•
•
•

•

if they experience staffing difficulties;
if we fail to communicate effectively or provide the appropriate level of oversight;
if they undergo changes in priorities or corporate structure including as a result of a merger or acquisition or other transaction, or become
financially distressed; or
if they form relationships with other entities, some of which may be our competitors.

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If the third parties upon whom we rely to conduct our trials fail to adhere to clinical trial protocols or to regulatory requirements, the quantity, quality or
accuracy of the data obtained by the third parties may be compromised. We are exposed to risk of fraud or other misconduct by such third parties.

Any of these events could cause our preclinical studies and clinical trials, including post-approval clinical trials, to be extended, delayed, suspended,
required to be repeated or terminated, or we may receive untitled warning letters or be the subject of an enforcement action, which could result in our
failing to obtain and maintain marketing approval of vadadustat or any other product candidates on a timely basis, or at all, or fail to maintain marketing
approval of Auryxia, or any other products, any of which would adversely affect our business operations. In addition, if the third parties upon whom we
rely fail to perform effectively or terminate their engagement with us, we may need to enter into alternative arrangements, which could delay, perhaps
significantly, the development and commercialization of vadadustat, if approved, or any other product candidates.

Even though we do not directly control the third parties upon whom we rely to conduct our preclinical studies and clinical trials and therefore cannot
guarantee the satisfactory and timely performance of their obligations to us, we are nevertheless responsible for ensuring that each of our clinical trials and
preclinical studies is conducted in accordance with the applicable protocol, legal and regulatory requirements, including GXP requirements, and scientific
standards, and our reliance on these third parties, including CROs, will not relieve us of our regulatory responsibilities. If we or any of our CROs, their
subcontractors, or clinical or preclinical trial sites fail to comply with applicable GXP requirements, the clinical data generated in our trials may be deemed
unreliable or insufficient, our clinical trials could be put on hold, and/or the FDA, the EMA or other regulatory authorities may require us to perform
additional clinical trials before approving our marketing applications. In addition, our clinical and preclinical trials must be conducted with drug product
that meets certain specifications and is manufactured under applicable cGMP regulations. These requirements include, among other things, quality control,
quality assurance, and the satisfactory maintenance of records and documentation.

We also rely upon third parties to store and distribute drug product for our clinical trials. For example, we use third parties to store product at various sites
in the United States to distribute to our clinical trial sites. Any performance failure on the part of our storage or distributor partners could delay clinical
development, marketing approval or commercialization, resulting in additional costs and depriving us of potential product revenue.

If the licensor of certain intellectual property relating to Auryxia terminates, modifies or threatens to terminate existing contracts or relationships with
us, our business may be materially harmed.

We do not own all of the rights to our product, Auryxia. We have licensed and sublicensed certain rights, patent and otherwise, to Auryxia from a third
party, Panion & BF Biotech, Inc., or Panion, who in turn licenses certain rights to Auryxia from one of the inventors of Auryxia. The license agreement
with Panion, or the Panion License Agreement, requires us to meet development milestones and imposes development and commercialization due diligence
requirements on us. In addition, under the Panion License Agreement, we must pay royalties based on a mid-single digit percentage of net sales of product
resulting from the licensed technologies, including Auryxia, and pay the patent filing, prosecution and maintenance costs related to the license. If we do not
meet our obligations in a timely manner, or if we otherwise breach the terms of the Panion License Agreement, Panion could terminate the agreement, and
we would lose the rights to Auryxia. For example, following announcement of the Merger, Panion notified Keryx in writing that Panion would terminate
the Panion License Agreement on November 21, 2018 if Keryx did not cure the breach alleged by Panion, specifically, that Keryx failed to use
commercially reasonable best efforts to commercialize Auryxia outside the United States. Keryx disagreed with Panion’s claims, and the parties entered
discussions to resolve this dispute. On October 24, 2018, prior to the consummation of the Merger, we, Keryx and Panion entered into a letter agreement, or
the Panion Letter Agreement, pursuant to which Panion agreed to rescind any and all prior termination threats or notices relating to the Panion License
Agreement and waived its rights to terminate the license agreement based on any breach by us of our obligation to use commercially reasonable efforts to
commercialize Auryxia outside the United States until the parties executed an amendment to the Panion License Agreement in accordance with the terms of
the Panion Letter Agreement, following consummation of the Merger. On April 17, 2019, we and Panion entered into an amendment and restatement of the
Panion License Agreement, or the Panion Amended License Agreement, which reflects certain revisions consistent with the terms of the Panion Letter
Agreement. See Note 4 to our consolidated financial statements in Part II, Item 8. Financial Statements and Supplementary Data of this Annual Report on
Form 10-K for additional information regarding the Panion Amended License Agreement. Even though we entered into the Panion Amended License
Agreement, there are no assurances that Panion will not allege other breaches of the Panion Amended License Agreement or otherwise attempt to terminate
the Panion Amended License Agreement in the future. In addition, if Panion breaches its agreement with the inventor from whom it licenses rights to
Auryxia, Panion could lose its license, which could impair or delay our ability to develop and commercialize Auryxia.

From time to time, we may have disagreements with Panion, or Panion may have disagreements with the inventor from whom it licenses rights to Auryxia,
regarding the terms of the agreements or ownership of proprietary rights, which could impact the

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commercialization of Auryxia, could require or result in litigation or arbitration, which would be time-consuming and expensive, could lead to the
termination of the Panion Amended License Agreement, or force us to negotiate a revised or new license agreement on terms less favorable than the
original. In addition, in the event that the owners and/or licensors of the rights we license were to enter into bankruptcy or similar proceedings, we could
potentially lose our rights to Auryxia or our rights could otherwise be adversely affected, which could prevent us from continuing to commercialize
Auryxia.

Risks Related to our Intellectual Property

If we are unable to adequately protect our intellectual property, third parties may be able to use our intellectual property, which could adversely affect
our ability to compete in the market.

Our commercial success will depend in part on our ability, and the ability of our licensors, to obtain and maintain patent protection on our drug product and
technologies, and to successfully defend these patents against third party challenges. We seek to protect our proprietary products and technology by filing
patent applications in the United States and certain foreign jurisdictions. The process for obtaining patent protection is expensive and time consuming, and
we may not be able to file and prosecute all necessary or desirable patent applications in a cost effective or timely manner. In addition, we may fail to
identify patentable subject matter early enough to obtain patent protection. Further, license agreements with third parties may not allow us to control the
preparation, filing and prosecution of patent applications, or the maintenance or enforcement of patents. Such third parties may decide not to enforce such
patents or enforce such patents without our involvement. Thus, these patent applications and patents may not, under these circumstances, be prosecuted or
enforced in a manner consistent with the best interests of the company.

Our pending patent applications may not issue as patents and may not issue in all countries in which we develop, manufacture or potentially sell our
product or in countries where others develop, manufacture and potentially sell products using our technologies. Moreover, our pending patent applications,
if issued as patents, may not provide additional protection for our product.

The patent positions of pharmaceutical and biotechnology companies can be highly uncertain and involve complex legal and factual questions. No
consistent policy regarding the breadth of claims allowed in pharmaceutical and biotechnology patents has emerged to date. Changes in the patent laws or
the interpretation of the patent laws in the United States and other jurisdictions may diminish the value of our patents or narrow the scope of our patent
protection. Accordingly, the patents we own or license may not be sufficiently broad to prevent others from practicing our technologies or from developing
competing products. Furthermore, others may independently develop similar or alternative drug products or technologies or design around our patented
drug product and technologies which may have an adverse effect on our business. If our competitors prepare and file patent applications in the United
States that claim technology also claimed by us, we may have to participate in interference or derivation proceedings in front of the U.S. Patent and
Trademark Office, or USPTO, to determine priority of invention, which could result in substantial cost, even if the eventual outcome is favorable to us.
Because of the extensive time required for development, testing and regulatory review of a potential product, it is possible that any related patent may
expire prior to, or remain in existence for only a short period following, commercialization, which may significantly diminish our ability to exclude others
from commercializing products that are similar or identical to ours. The patents we own or license may be challenged or invalidated or may fail to provide
us with any competitive advantage. Since we have licensed or sublicensed many patents from third parties, we may not be able to enforce such licensed
patents against third party infringers without the cooperation of the patent owner and the licensor, which may not be forthcoming. In addition, we may not
be successful or timely in obtaining any patents for which we submit applications.

Generally, the first to file a patent application is entitled to the patent if all other requirements of patentability are met. However, prior to March 16, 2013,
in the United States, the first to invent was entitled to the patent. Since publications of discoveries in the scientific literature often lag behind the actual
discoveries, and patent applications in the United States and other jurisdictions are typically not published until 18 months after filing, or in some cases not
at all, we cannot know with certainty whether we were the first to make the inventions claimed in our patents or pending patent applications, or that we
were the first to file for patent protection of such inventions. Moreover, the laws enacted by the Leahy-Smith America Invents Act of 2011, which reformed
certain patent laws in the United States, introduce procedures that permit competitors to challenge our patents in the USPTO after grant, including inter
partes review and post grant review. Similar laws exist outside of the United States. The laws of the European Patent Convention, for example, provide for
post-grant opposition procedures that permit competitors to challenge, or oppose, our European patents administratively at the European Patent Office.

We may become involved in addressing patentability objections based on third party submission of references, or we may become involved in defending
our patent rights in oppositions, derivation proceedings, reexamination, inter partes review, post grant review, interference proceedings or other patent
office proceedings or litigation, in the United States or elsewhere, challenging our patent rights or the patent rights of others. An adverse result in any such
proceeding or litigation could reduce

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the scope of, or invalidate, our patent rights, allow third parties to commercialize our technology or products and compete directly with us, without
payment to us.

The issuance of a patent is not conclusive as to its inventorship, scope, validity or enforceability, and our owned and licensed patents may be challenged on
such a basis in the courts or patent offices in the United States and abroad. As a result of such challenges, we may lose exclusivity or freedom-to-operate or
patent claims may be narrowed, invalidated or held unenforceable, in whole or in part, which could limit our ability to prevent third parties from using or
commercializing similar or identical products, or limit the duration of the patent protection for our products.

Periodic maintenance fees on any issued patent are due to be paid to the USPTO and foreign patent agencies in several stages over the lifetime of the
patent. The USPTO and governmental patent agencies in other jurisdictions also require compliance with a number of procedural, documentary, fee
payment (such as annuities) and other similar provisions during the patent application process. While an inadvertent lapse in many cases can be cured by
payment of a late fee or by other means in accordance with the applicable rules, there are situations in which non-compliance can result in abandonment or
lapse of the patent or patent application, resulting in partial or complete loss of patent rights in the relevant jurisdiction. Non-compliance events that could
result in abandonment or lapse of a patent or patent application include, but are not limited to, failure to respond to official actions within prescribed time
limits, non-payment of fees, and failure to properly legalize and submit formal documents. In such an event, our competitors might be able to enter the
market sooner than we expect, which would have a material adverse effect on our business.

In addition, patents protecting our product candidate might expire before or shortly after such candidate is commercialized. Thus, our patent portfolio may
not provide sufficient rights to exclude others from commercializing products similar or identical to ours.

We also rely on trade secrets and know-how to protect our intellectual property where we believe patent protection is not appropriate or obtainable. Trade
secrets are difficult to protect. While we require our employees, licensees, collaborators and consultants to enter into confidentiality agreements, this may
not be sufficient to adequately protect our trade secrets or other proprietary information. In addition, in some cases, we share certain ownership and
publication rights to data relating to some of our products and product candidates with research collaborators, licensees and other third parties. If we cannot
maintain the confidentiality of this information, our ability to receive patent protection or protect our trade secrets or other proprietary information will be
at risk.

We may not be able to protect our intellectual property rights throughout the world.

Filing, prosecuting and defending patents on our products and product candidates in all countries throughout the world would be prohibitively expensive.
Consequently, the breadth of our intellectual property rights in some countries outside the United States may be less extensive than those in the United
States. In addition, the laws of some countries do not protect intellectual property rights to the same extent as laws in the United States. As a result, we may
not be able to prevent third parties from practicing our inventions in all countries outside the United States, or from selling or importing products made
using our inventions in and into the United States or other countries. Competitors may use our technologies in countries where we have not obtained patent
protection to develop their own products and, further, may infringe our patents in territories where we have patent protection, but where enforcement is not
as strong as in the United States. These products may compete with our products and our patents or other intellectual property rights may not be effective or
sufficient to prevent them from competing.

Many companies have encountered significant problems in protecting and defending intellectual property rights in certain countries. The legal systems of
certain countries, particularly certain developing countries, do not favor the enforcement of patents, trade secrets and other intellectual property,
particularly those relating to pharmaceutical and biotechnology products, which could make it difficult for us to stop the infringement of our patents or the
marketing of competing products in violation of our proprietary rights generally. Proceedings to enforce our patent rights in countries outside of the United
States could result in substantial costs and divert our efforts and attention from other aspects of our business, could put our patents at risk of being
invalidated or interpreted narrowly and our patent applications at risk of not issuing, and could provoke third parties to assert claims against us. We may not
prevail in any lawsuits that we initiate, and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our efforts
to enforce our intellectual property rights around the world may be inadequate to obtain a significant commercial advantage for our products and product
candidates from the intellectual property that we develop or license.

The intellectual property that we own or have licensed and related non-patent exclusivity relating to our current and future products is, and may be,
limited, which could adversely affect our ability to compete in the market and adversely affect the value of Auryxia.

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The patent rights and related non-patent exclusivity that we own or have licensed relating to Auryxia are limited in ways that may affect our ability to
exclude third parties from competing against us. For example, a third party may design around our owned or licensed composition of matter patent claims
or market a product for the methods of use not covered by our owned or licensed patents.

Obtaining proof of direct infringement by a competitor for a method of use patent requires us to demonstrate that the competitors make and market a
product for the patented use(s). Alternatively, we can prove that our competitors induce or contribute to others in engaging in direct infringement. Proving
that a competitor contributes to or induces infringement of a patented method by another has additional proof requirements. For example, proving
inducement of infringement requires proof of intent by the competitor. If we are required to defend ourselves against claims or to protect our own
proprietary rights against others, it could result in substantial costs to us and the distraction of our management. An adverse ruling in any litigation or
administrative proceeding could prevent us from marketing and selling Auryxia, increase the risk that a generic or other similar version of Auryxia could
enter the market to compete with Auryxia, limit our development and commercialization of Auryxia, or otherwise harm our competitive position and result
in additional significant costs.

Moreover, physicians may prescribe a competitive identical product for indications other than the one for which the product has been approved, or “off-
label” indications, that are covered by the applicable patents. Although such off-label prescriptions may directly infringe or contribute to or induce
infringement of method of use patents, such infringement is difficult to prevent.

In addition, any limitations of our patent protection described above may adversely affect the value of our drug product and may inhibit our ability to obtain
a collaboration partner at terms acceptable to us, if at all.

In addition to patent rights in the United States, we may seek non-patent exclusivity for vadadustat and other product candidates under other provisions of
the FDCA such as new chemical entity, or NCE, exclusivity, or exclusivity for a new use or new formulation, but there is no guarantee that vadadustat or
any other product candidates will receive such exclusivity. The FDCA provides a five-year period of non-patent exclusivity within the United States to the
first sponsor to gain approval of an NDA for an NCE. A drug is an NCE if the FDA has not previously approved any other new drug containing the same
active moiety, which consists of the molecule(s) or ion(s) responsible for the action of the drug substance (but not including those portions of the molecule
that cause it to be a salt or ester or which are not bound to the molecule by covalent or similar bonds). During the exclusivity period, the FDA may not
accept for review an ANDA or a 505(b)(2) NDA submitted by another company for another version of such drug where the sponsor does not own or have a
legal right of reference to all the data required for approval.

An ANDA that references an NDA product with NCE exclusivity may be submitted after four years if it contains a certification of patent invalidity or non-
infringement. The FDCA also provides three years of exclusivity for an NDA, particularly a 505(b)(2) NDA or supplement to an existing NDA, if new
clinical investigations, other than bioavailability studies, that were conducted or sponsored by the sponsor are deemed by the FDA to be essential to the
approval of the application (for example, for new indications, dosages, or strengths of an existing drug). This three-year exclusivity covers only the
conditions associated with the new clinical investigations and does not prohibit the FDA from approving ANDAs for drugs containing the original active
agent. The three-year exclusivity period, unlike five-year exclusivity, does not prevent the submission of a competing ANDA or 505(b)(2) NDA. Instead, it
only prevents the FDA from granting final approval to such a product until expiration of the exclusivity period. Five-year and three-year exclusivity will
not delay the submission (in the case of five-year exclusivity) or the approval (in the case of three-year exclusivity) of a full NDA submitted under section
505(b)(1) of the FDCA; however, a sponsor submitting a full NDA would be required to conduct all of its own studies needed to independently support a
finding of safety and effectiveness for the proposed product, or have a full right of reference to all studies not conducted by the sponsor.

In cases where NCE exclusivity has been granted to a new drug product, the 30-month stay triggered by such litigation is extended by the amount of time
such that seven years and six months will elapse from the date of approval of the NDA for that product. Without NCE exclusivity, the 30-month stay on
FDA final approval of an ANDA runs from the date on which the sponsor of the reference listed drug receives notice of a Paragraph IV certification from
the ANDA sponsor.

In addition to NCE, in the United States, the FDA has the authority to grant additional regulatory exclusivity protection for approved drugs where the
sponsor conducts specified testing in pediatric or adolescent populations. If granted, this pediatric exclusivity may provide an additional six months which
are added to the term of any non-patent exclusivity that has been awarded as well as to the regulatory protection related to the term of a relevant patent, to
the extent these protections have not already expired.

We cannot assure you that Auryxia, vadadustat, if approved, or any of our potential future products will obtain such pediatric exclusivity, NCE exclusivity
or any other market exclusivity in the United States, EU or any other territory, or that we will be the first to receive the respective regulatory approval for
such drugs so as to be eligible for any non-patent exclusivity

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protection. We also cannot assure you that Auryxia, vadadustat, if approved, or any of our potential future products will obtain patent term extension.

The market entry of one or more generic competitors or any third party’s attempt to challenge our intellectual property rights will likely limit Auryxia
sales and have an adverse impact on our business and results of operation.

Although the composition and use of Auryxia is currently claimed by 15 issued patents that are listed in the FDA’s Orange Book, we cannot assure you that
we will be successful in defending against third parties attempting to invalidate or design around our patents or asserting that our patents are invalid or
otherwise unenforceable or not infringed, or in competing against third parties introducing generic equivalents of Auryxia or any of our potential future
products. If our Orange Book-listed patents are successfully challenged by a third party and a generic version of Auryxia is approved and launched sooner
than we anticipate, revenue from Auryxia could decline significantly, which would have a material adverse effect on our sales, results of operations and
financial condition.

We previously received Paragraph IV certification notice letters regarding ANDAs submitted to the FDA requesting approval for generic versions of
Auryxia tablets (210 mg ferric iron per tablet). We filed complaints for patent infringement relating to such ANDAs, and subsequently entered into
settlement and license agreements with all such ANDA filers that allow such ANDA filers to market a generic version of Auryxia in the United States
beginning on March 20, 2025. It is possible that we may receive Paragraph IV certification notice letters from additional ANDA filers and may not
ultimately be successful in an ANDA litigation. For example, in February 2023, we received another Paragraph IV certification notice letter regarding an
ANDA submitted to the FDA. Generic competition for Auryxia or any of our potential future products could have a material adverse effect on our sales,
results of operations and financial condition.

Litigation and administrative proceedings, including third party claims of intellectual property infringement and opposition/invalidation proceedings
against third party patents, may be costly and time consuming and may delay or harm our drug discovery, development and commercialization efforts.

We may be forced to initiate litigation to enforce our contractual and intellectual property rights, or we may be sued by third parties asserting claims based
on contract, tort or intellectual property infringement. Competitors may infringe our patents or misappropriate our trade secrets or confidential information.
We may not be able to prevent infringement of our patents or misappropriation of our trade secrets or confidential information, particularly in countries
where the laws may not protect those rights as fully as in the United States. In addition, third parties may have or may obtain patents in the future and claim
that our products or other technologies infringe their patents. If we are required to defend against suits brought by third parties, or if we sue third parties to
protect our rights, we may be required to pay substantial litigation costs, and our management’s attention may be diverted from operating our business. In
addition, any legal action against our licensor, licensees or us that seeks damages or an injunction of commercial activities relating to Auryxia, vadadustat
or any other product candidates or other technologies, including those that may be in-licensed or acquired, could subject us to monetary liability, a
temporary or permanent injunction preventing the development, marketing and sale of such products or such technologies, and/or require our licensor,
licensees or us to obtain a license to continue to develop, market or sell such products or other technologies. In addition, in an infringement proceeding, a
court may decide that a patent of ours is not valid or is unenforceable, or may refuse to stop the other party from using the technology at issue on the
grounds that our patents do not cover the technology in question. We cannot predict whether our licensor, licensees or we would prevail in any of these
types of actions or that any required license would be made available on commercially acceptable terms, if at all.

Our commercial success depends in part on our avoiding infringement of the patents and proprietary rights of third parties. However, there may be patents
of third parties of which we are currently unaware with claims to compounds, materials, formulations, methods of manufacture or methods for treatment
related to the use or manufacture of our product candidates. Also, because patent applications can take many years to issue, there may be currently pending
patent applications which may later result in issued patents that our product candidates may infringe. The pharmaceutical and biotechnology industries are
characterized by extensive litigation over patent and other intellectual property rights. We have in the past and may in the future become a party to, or be
threatened with, future adversarial litigation or other proceedings regarding intellectual property rights with respect to our product and product candidates.
As the pharmaceutical and biotechnology industries expand and more patents are issued, the risk increases that our drug candidates may give rise to claims
of infringement of the patent rights of others.

While our product candidates are in preclinical studies and clinical trials, we believe that the use of our product candidates in these preclinical studies and
clinical trials in the United States falls within the scope of the exemptions provided by 35 U.S.C. Section 271(e), which provides that it shall not be an act
of infringement to make, use, offer to sell, or sell within the United States or import into the United States a patented invention solely for uses reasonably
related to the development and submission of information to the FDA. There is an increased possibility of a patent infringement claim against us with
respect to commercial products. Our portfolio includes one commercial product, Auryxia. We received the CRL from the FDA regarding our NDA for
vadadustat in March 2022, and, if in the future vadadustat is approved, vadadustat could be

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commercialized. We attempt to ensure that our products and product candidates and the methods we employ to manufacture them, as well as the methods
for their use which we intend to promote, do not infringe other parties’ patents and other proprietary rights. There can be no assurance they do not,
however, and competitors or other parties may assert that we infringe their proprietary rights in any event.

FibroGen has filed patent applications in the United States and other countries directed to purportedly new methods of using previously known heterocyclic
carboxamide compounds for purposes of treating or affecting specified conditions, and some of these applications have since issued as patents. To the
extent any such patents issue or have been issued, we may initiate opposition or other legal proceedings with respect to such patents. We discuss the status
of the opposition and/or invalidation proceedings against certain FibroGen patents in Part I, Item 3. Legal Proceedings of this Annual Report on Form 10-
K.

Third parties, including FibroGen, may in the future claim that our product and product candidates and other technologies infringe upon their patents and
may challenge our ability to commercialize Auryxia and vadadustat, if approved. Parties making claims against us or our licensees may seek and obtain
injunctive or other equitable relief, which could effectively block our or their ability to continue to commercialize Auryxia or further develop and
commercialize vadadustat or any other product candidates, including those that may be in-licensed or acquired. If any third party patents were held by a
court of competent jurisdiction to cover the manufacturing process of any of our products or product candidates, any molecules formed during the
manufacturing process or any final product itself, the holders of any such patents may be able to block our ability to commercialize such product or product
candidate unless we obtained a license under the applicable patents, or until such patents expire or they are finally determined to be held invalid or
unenforceable. Similarly, if any third party patent were held by a court of competent jurisdiction to cover aspects of our formulations, processes for
manufacture or our intended methods of use, the holders of any such patent may be able to block or impair our ability to develop and commercialize the
applicable product candidate unless we obtained a license or until such patent expires or is finally determined to be held invalid or unenforceable. We may
also elect to enter into a license in order to settle litigation or in order to resolve disputes prior to litigation. Furthermore, even in the absence of litigation,
we may need to obtain licenses from third parties to advance our research or allow commercialization of our products or product candidates. Should a
license to a third party patent become necessary, we cannot predict whether we would be able to obtain a license or, if a license were available, whether it
would be available on commercially reasonable terms. If such a license is necessary and a license under the applicable patent is unavailable on
commercially reasonable terms, or at all, our ability to commercialize our product or product candidate may be impaired or delayed, which could in turn
significantly harm our business.

Further, defense of infringement claims, regardless of their merit, would involve substantial litigation expense and would be a substantial diversion of
employee resources from our business. In the event of a successful claim of infringement against us, we may have to pay substantial damages, including
treble damages and attorneys’ fees for willful infringement, pay royalties or redesign our products, which may be impossible or require substantial time and
monetary expenditure.

In addition, there may be a challenge or dispute regarding inventorship or ownership of patents or applications currently identified as being owned by or
licensed  to  us.  Defense  of  these  claims,  regardless  of  their  merit,  would  involve  substantial  litigation  expense  and  would  be  a  substantial  diversion  of
employee resources from our business. Interference proceedings provoked by third parties or brought by the USPTO may be necessary to determine the
priority of inventions with respect to our patents or patent applications.

Various administrative proceedings are also available for challenging patents, including interference, reexamination, inter partes review, and post-grant
review proceedings before the USPTO or oppositions and other comparable proceedings in foreign jurisdictions. Competitors may initiate an administrative
proceeding challenging our issued patents or pending patent applications, which can be expensive and time-consuming to defend. An adverse result in any
current or future defense proceedings could put one or more of our patents at risk of being invalidated, held unenforceable, or interpreted narrowly and held
not infringed and could put our patent applications at risk of not issuing. In addition, an unfavorable outcome in any current or future proceeding in which
we are challenging third party patents could require us to cease using the patented technology or to attempt to license rights to it from the prevailing party.
Our business could be harmed if the prevailing party does not offer us a license on commercially reasonable terms or at all. Even if we are successful,
participation in interference or other administrative proceedings before the USPTO or a foreign patent office may result in substantial costs and distract our
management and other employees.

We are currently involved in opposition and invalidation proceedings in the European Patent Office, Intellectual Property High Court of Japan, and the
Patents Court of the UK. These proceedings may be ongoing for a number of years and may involve substantial expense and diversion of employee
resources from our business. In addition, we may become involved in additional opposition proceedings or other legal or administrative proceedings in the
future. For more information, see the other risk factors under “Risks Related to our Intellectual Property”.

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Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation and some administrative
proceedings, there is a risk that some of our confidential information could be compromised by disclosure during discovery. In addition, there could be
public announcements of the results of hearings, motions or other interim proceedings or developments. If securities analysts or investors perceive these
results to be negative, it could have a substantial adverse effect on the price of our common stock.

We may be subject to claims that our employees, consultants or independent contractors have wrongfully used or disclosed confidential information of
third parties.

We have received confidential and proprietary information from potential collaborators, prospective licensees and other third parties. In addition, we
employ individuals who were previously employed at other biotechnology or pharmaceutical companies. We may be subject to claims that we or our
employees, consultants or independent contractors have inadvertently or otherwise used or disclosed confidential information of these third parties or our
employees’ former employers. We may also be subject to claims that former employees, collaborators or other third parties have an ownership interest in
our patents or other intellectual property. We may be subject to ownership disputes in the future arising, for example, from conflicting obligations of
consultants or others who are involved in developing our product candidates. Litigation may be necessary to defend against these claims. If we fail in
defending any such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights, such as exclusive ownership of, or
right to use, valuable intellectual property. Such an outcome could have a material adverse effect on our business. Even if we are successful in defending
against these claims, litigation could result in substantial cost and be a distraction to our management and employees.

Risks Related to our Business and Managing Growth

If we fail to attract, retain and motivate senior management and qualified personnel, we may be unable to successfully develop, obtain and/or maintain
marketing approval of and commercialize vadadustat or commercialize Auryxia.

Recruiting and retaining qualified personnel is critical to our success. We are also highly dependent on our executives, certain members of our senior
management and certain members of our commercial organization. The loss of the services of our executives, senior managers or other employees could
impede the achievement of our research, development, regulatory and commercialization objectives and seriously harm our ability to successfully
implement our business strategy. Specifically, following receipt of the CRL, in April and May 2022, we implemented a reduction of our workforce by
approximately 42% across all areas of our company (47% inclusive of the closing of the majority of open positions), including several members of
management. In November 2022, we also implemented a reduction of our workforce, by approximately 14% consisting of individuals within our
commercial organization as a result of our decision to shift to a strategic account management focused model for our commercial efforts. In addition,
uncertainty related to the timing and outcome of regulatory decisions, could increase attrition. Losing members of management and other key personnel
subjects us to a number of risks, including the failure to coordinate responsibilities and tasks, the necessity to create new management systems and
processes, the impact on corporate culture, and the retention of historical knowledge.

Furthermore, replacing executives, senior managers and other key employees may be difficult and may take an extended period of time because of the
limited number of individuals in our industry with the breadth of skills and experience required to successfully develop, obtain and/or maintain marketing
approval of and commercialize Auryxia, vadadustat and other product candidates. Our future financial performance and our ability to develop, obtain
and/or maintain marketing approval of and commercialize Auryxia and vadadustat and to compete effectively will depend, in part, on our ability to manage
any future growth effectively. To that end, we must be able to hire, train, integrate, and retain additional qualified personnel with sufficient experience. We
may be unable to hire, train, retain or motivate these personnel on acceptable terms given the intense competition among numerous biopharmaceutical
companies for similar personnel, particularly in our geographic region.

We also experience competition for the hiring of personnel from universities and research institutions. In addition, we rely on contractors, consultants and
advisors, including scientific and clinical advisors, to assist us in formulating and executing our research and development and commercialization strategy.
Our contractors, consultants and advisors may become employed by companies other than ours and may have commitments with other entities that may
limit their availability to us. If additional members of management or other personnel leave, or we are unable to continue to attract and retain high quality
personnel, our ability to grow and pursue our business strategy will be limited.

Our cost savings plan and the associated workforce reductions implemented in April, May and November 2022 may not result in anticipated savings,
could result in total costs and expenses that are greater than expected and could disrupt our business.

Following receipt of the CRL, in April and May 2022, we implemented a reduction in workforce by approximately 42% across all areas of our company
(47% inclusive of the closing of the majority of open positions), including several members of

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management. In November 2022, we also implemented a reduction of our workforce, by approximately 14% consisting of individuals within our
commercial organization. The reductions in workforce reflect our strategic pillars to drive Auryxia revenue while also continuing to decrease operating
costs. We may not realize, in full or in part, the anticipated benefits, savings and improvements in our cost structure from our restructuring efforts due to
unforeseen difficulties, delays or unexpected costs. We recorded a restructuring charge of approximately $15.9 million in the aggregate primarily related to
contractual termination benefits including severance, non-cash stock-based compensation expense, healthcare and related benefits in the year ended
December 31, 2022. If we are unable to realize the expected operational efficiencies and cost savings from the restructuring, our operating results and
financial condition would be adversely affected. We also cannot guarantee that we will not have to undertake additional workforce reductions or
restructuring activities in the future, including as a result of the FDA's decision related to our appeal of the CRL for vadadustat. Furthermore, our cost
savings plan may be disruptive to our operations, including our commercialization of Auryxia, which could affect our ability to generate product revenue.
In addition, our workforce reductions could yield unanticipated consequences, such as attrition beyond planned staff reductions, or disruptions in our day-
to-day operations. Our workforce reductions could also harm our ability to attract and retain qualified management, scientific, clinical, manufacturing and
sales and marketing personnel who are critical to our business. Any failure to attract or retain qualified personnel could prevent us from successfully
commercializing Auryxia and from successfully developing and commercializing our product candidates in the future, including vadadustat, if approved. If
we are ultimately successful in obtaining approval of vadadustat in the United States, we will need to hire additional employees to support the
commercialization of vadadustat in the United States, and if we are unsuccessful or delayed in doing so, the potential launch of vadadustat could be
delayed.

We may encounter difficulties in managing our growth, including with respect to our employee base, and managing our operations successfully.

In our day-to-day operations, we may encounter difficulties in managing the size of our operations as well as challenges associated with managing our
business. We have strategic collaborations for the commercialization of Riona and the development and commercialization of vadadustat, which is now
being marketed under the trade name Vafseo  by our collaboration partner, MTPC, in Japan. Additionally, in the United States, we have a strategic
relationship with CSL Vifor related to the commercialization of vadadustat, if approved. As our operations continue, we expect that we will need to manage
our current relationships and enter into new relationships, especially in light of the termination of our collaboration agreements with Otsuka, with various
strategic collaborators, consultants, vendors, suppliers and other third parties. These relationships are complex and create numerous risks as we deal with
issues that arise.

TM

Our future financial performance and our ability to commercialize Auryxia and vadadustat, if and where approved, and to compete effectively will depend,
in part, on our ability to manage any future growth effectively. This future growth will impose significant added responsibilities on the business and
members of management. To manage any future growth, we must continue to implement and improve our managerial, operational and financial systems,
procedures and processes. We may not be able to implement these improvements in an efficient or timely manner and may discover deficiencies in existing
systems, procedures and processes. Moreover, the systems, procedures and processes currently in place or to be implemented may not be adequate for any
such growth. Any expansion of our operations may lead to significant costs and may divert our management and business development resources. Any
inability to manage growth could delay the execution of our business plans or disrupt our operations. We may not be able to accomplish these tasks, and our
failure to accomplish any of them could prevent us from successfully managing and, as applicable, growing our company.

In addition, we may need to further adjust the size of our workforce as a result of changes to our expectations for our business, which can result in
management being required to divert a disproportionate amount of its attention away from our day-to-day activities and devote a substantial amount of time
to managing these growth-related activities and related expenses. Further, we rely on independent third parties to provide certain services to us. We
structure our relationships with these outside service providers in a manner that we believe results in an independent contractor relationship, not an
employee relationship. If any of our service providers are later legally deemed to be employees, we could be subject to employment and tax withholding
liabilities and other additional costs as well as other multiple damages and attorneys’ fees.

If we fail to develop or maintain proper and effective internal control over financial reporting, our ability to produce accurate and timely financial
statements could be impaired, investors may lose confidence in us and the trading price of our common stock may decline.

Effective internal control over financial reporting is necessary for us to provide reliable financial reports and effectively prevent fraud and operate
successfully as a public company. Any failure to maintain internal control over financial reporting could severely inhibit our ability to accurately report our
financial condition, results of operations or cash flows. If our internal control over financial reporting is not effective, investors may lose confidence in the
accuracy and completeness of our financial reports, the market price of our common stock could decline, and we could be subject to sanctions or
investigations by Nasdaq, the SEC or other regulatory authorities. Failure to remedy any material weakness in our internal control over financial reporting
could also restrict our future access to the capital markets.

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A material weakness in internal control over financial reporting has in the past and could in the future lead to deficiencies in the preparation of financial
statements. Deficiencies in the preparation of financial statements, could lead to litigation claims against us. The defense of any such claims may cause the
diversion of management’s attention and resources, and we may be required to pay damages if any such claims or proceedings are not resolved in our favor.
Any litigation, even if resolved in our favor, could cause us to incur significant legal and other expenses. Such events could also affect our ability to raise
capital to fund future business initiatives.

Security breaches and unauthorized use of our information technology systems and information, or the information technology systems or information
in the possession of our collaborators and other third parties, could damage the integrity of our clinical trials, impact our regulatory filings,
compromise our ability to protect our intellectual property, and subject us to regulatory actions that could result in significant fines or other penalties.

We, our collaborators, contractors and other third parties rely significantly upon information technology, and any failure, inadequacy, interruption or
security lapse of that technology, including any cybersecurity incidents, could harm our ability to operate our business effectively. In addition, we and our
collaborators, contractors and other third parties rely on information technology networks and systems, including the Internet, to process, transmit and store
clinical trial data, patient information, and other electronic information, and manage or support a variety of business processes, including operational and
financial transactions and records, personal identifying information, payroll data and workforce scheduling information. We purchase most of our
information technology from vendors, on whom our systems depend. We rely on commercially available systems, software, tools and monitoring to provide
security for the processing, transmission and storage of company and customer information.

In the ordinary course of our business, we and our third party contractors maintain personal and other sensitive data on our and their respective networks,
including our intellectual property and proprietary or confidential business information relating to our business and that of our clinical trial patients and
business partners. In particular, we rely on CROs and other third parties to store and manage information from our clinical trials. We also rely on third
parties to manage patient information for Auryxia. The secure maintenance of this sensitive information is critical to our business and reputation.

Companies and other entities and individuals have been increasingly subject to a wide variety of security incidents, cyber-attacks and other attempts to gain
unauthorized access to systems and information. These threats can come from a variety of sources, ranging in sophistication from individual hackers to
state-sponsored attacks. Cyber threats may be broadly targeted, or they may be custom-crafted against our information systems or those of our vendors or
third party service providers. A security breach, cyberattack or unauthorized access of our clinical data or other data could damage the integrity of our
clinical trials, impact our regulatory filings, cause significant risk to our business, compromise our ability to protect our intellectual property, and subject us
to regulatory actions, including under the GDPR and CCPA discussed elsewhere in these risk factors and the privacy or security rules under federal, state,
or other local laws outside of the United States protecting confidential or personal information, that could be expensive to defend and could result in
significant fines or other penalties. Cyberattacks can include malware, computer viruses, hacking or other unauthorized access or other significant
compromise of our computer, communications and related systems. Although we take steps to manage and avoid these risks and to be prepared to respond
to attacks, our preventive and any remedial actions may not be successful and no such measures can eliminate the possibility of the systems’ improper
functioning or the improper access or disclosure of confidential or personally identifiable information such as in the event of cyberattacks. Security
breaches, whether through physical or electronic break-ins, computer viruses, ransomware, impersonation of authorized users, attacks by hackers or other
means, can create system disruptions or shutdowns or the unauthorized disclosure of confidential information.

Although we believe our collaborators, vendors and service providers, such as our CROs, take steps to manage and avoid information security risks and
respond to attacks, we may be adversely affected by attacks against our collaborators, vendors or service providers, and we may not have adequate
contractual remedies against such collaborators, vendors and service providers to remedy any harm to our business caused by such event. Additionally,
outside parties may attempt to fraudulently induce employees, collaborators, or other contractors to disclose sensitive information or take other actions,
including making fraudulent payments or downloading malware, by using “spoofing” and “phishing” emails or other types of attacks. Our employees may
be targeted by such fraudulent activities. Outside parties may also subject us to distributed denial of services attacks or introduce viruses or other malware
through “trojan horse” programs to our users’ computers in order to gain access to our systems and the data stored therein. Cyber-attacks have become
more prevalent and much harder to detect and defend against and, because the techniques used to obtain unauthorized access, disable or degrade service, or
sabotage systems change frequently and continuously become more sophisticated, often are not recognized until launched against a target and may be
difficult to detect for a long time, we may be unable to anticipate these techniques or to implement adequate preventive or detective measures, and we
might not immediately detect such incidents and the damage caused by such incidents.

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Such attacks, whether successful or unsuccessful, or other compromises with respect to our information security and the measures we implement to
prevent, detect and respond to them, could:

•

•
•

•
•
•

result in our incurring significant costs related to, for example, rebuilding internal systems, defending against litigation, responding to regulatory
inquiries or actions, paying damages or fines, or taking other remedial steps with respect to third parties;
lead to public exposure of personal information of participants in our clinical trials, Auryxia patients and others;
damage the integrity of our studies or delay their completion, disrupt our development programs, our business operations and commercialization
efforts;
compromise our ability to protect our trade secrets and proprietary information;
damage our reputation and deter business partners from working with us; or
divert the attention of our management and key information technology resources.

Any failure to maintain proper functionality and security of our internal computer and information systems could result in a loss of, or damage to, our data
or marketing applications or inappropriate disclosure of confidential or proprietary information, interrupt our operations, damage our reputation, subject us
to liability claims or regulatory penalties, under a variety of federal, state or other applicable privacy laws, such as HIPAA, the GDPR, or state data
protection laws including the CCPA, harm our competitive position and delay the further development and commercialization of our products and product
candidates, or impact our relationships with customers and patients.

Our employees, independent contractors, principal investigators, CROs, CMOs, consultants and vendors may engage in misconduct or other improper
activities, including non-compliance with regulatory standards and requirements and insider trading. In addition, laws and regulations governing any
international operations we have or may have in the future may require us to develop and implement costly compliance programs.

We are exposed to the risk that our employees, independent contractors, principal investigators, CROs, CMOs, consultants and vendors may engage in
fraudulent conduct or other illegal activity. Misconduct by these parties could include intentional, reckless and/or negligent conduct or unauthorized
activities that violate applicable laws, including the following:

•

•
•
•

FDA and other healthcare authorities’ regulations, including those laws that require the reporting of true, complete and accurate information to
regulatory authorities, and those prohibiting the promotion of unapproved drugs or approved drugs for an unapproved use;
quality standards, including GXP;
federal and state healthcare fraud and abuse laws and regulations and their non-U.S. equivalents;
anti-bribery and anti-corruption laws, such as the FCPA and the UK Bribery Act or country-specific anti-bribery or anti-corruption laws, as well as
various import and export laws and regulations;
laws that require the reporting of true and accurate financial information and data; and

•
• U.S. state and federal securities laws and regulations and their non-U.S. equivalents, including those related to insider trading.

We are seeking regulatory approval for vadadustat with the EMA and countries in the ACCESS Consortium, and we conducted our global clinical trials for
vadadustat, and may in the future conduct additional trials, in countries where corruption is prevalent, and violations of any of these laws by our personnel
or by any of our vendors or agents, such as our CROs or CMOs, could have a material adverse impact on our clinical trials and our business and could
result in criminal or civil fines and sanctions. We are subject to complex laws that govern our international business practices. These laws include the
FCPA, which prohibits U.S. companies and their intermediaries, such as CROs or CMOs, from making improper payments to foreign government officials
for the purpose of obtaining or keeping business or obtaining any kind of advantage for the company. The FCPA also requires companies to keep accurate
books and records and maintain adequate accounting controls. A number of past and recent FCPA investigations by the Department of Justice and the SEC
have focused on the life sciences sector.

Compliance with the FCPA is expensive and difficult, particularly in countries in which corruption is a recognized problem. Some of the countries in which
we have conducted clinical trials and in which we have CMOs have a history of corruption, which increases our risks of FCPA violations. In addition, the
FCPA presents unique challenges in the pharmaceutical industry because in many countries’ hospitals are operated by the government, and doctors and
other hospital employees are considered foreign government officials. Certain payments made by pharmaceutical companies, or on their behalf by CROs,
to hospitals in connection with clinical trials and other work have been deemed to be improper payments to government officials and have led to FCPA
enforcement actions.

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Additionally, the UK Bribery Act applies to our global activities and prohibits bribery of private individuals as well as public officials. The UK Bribery Act
prohibits both the offering and accepting of a bribe and imposes strict liability on companies for failing to prevent bribery, unless the company can show
that it had “adequate procedures” in place to prevent bribery. There are also local anti-bribery and anti-corruption laws in countries where we have
conducted clinical trials, and many of these also carry the risk of significant financial or criminal penalties.

We are also subject to trade control regulations and trade sanction laws that restrict the movement of certain goods, currency, products, materials, services
and technology to, and certain operations in, various countries or with certain persons. Our ability to transfer commercial and clinical product and other
clinical trial supplies, and for our employees, independent contractors, principal investigators, CROs, CMOs, consultants and vendors ability to travel,
between certain countries is subject to maintaining required licenses and complying with these laws and regulations.

Employee misconduct could also involve the improper use of information obtained in the course of clinical trials, which could result in regulatory sanctions
and serious harm to our reputation. This could include violations of HIPAA, other U.S. federal and state laws, and requirements of non-U.S. jurisdictions,
including the GDPR. We are also exposed to risks in connection with any insider trading violations by employees or others affiliated with us.

The internal controls, policies and procedures, and training and compliance programs we have implemented to deter prohibited practices may not be
effective in preventing our employees, contractors, consultants, agents or other representatives from violating or circumventing such internal policies or
violating applicable laws and regulations. The failure to comply with laws governing international business practices may impact any future clinical trials,
result in substantial civil or criminal penalties for us and any such individuals, including imprisonment, suspension or debarment from government
contracting, withdrawal of our products, if approved, from the market, or being delisted from The Nasdaq Capital Market. In addition, we may incur
significant costs in implementing sufficient systems, controls and processes to ensure compliance with the aforementioned laws. The laws and regulations
referenced above may restrict or prohibit a wide range of pricing, discounting, marketing and promotion, sales commission, customer incentive programs
and other business arrangements that could adversely affect our business.

Additionally, it is not always possible to identify and deter misconduct by employees and third parties, and the precautions we take to detect and prevent
this activity may not be effective in controlling known or unknown risks or preventing losses or in protecting us from governmental investigations or other
actions or lawsuits stemming from a failure to be in compliance with such laws or regulations. If any such actions are instituted against us, and we are not
successful in defending ourselves or asserting our rights, or if any such action is instituted against our employees, consultants, independent contractors,
CROs, CMOs, vendors or principal investigators, those actions could have a significant impact on our business, including the imposition of civil, criminal
and administrative penalties, damages, monetary fines, possible exclusion from participation in Medicare, Medicaid and other federal healthcare programs,
contractual damages, reputational harm, diminished profits and future earnings, curtailment of our operations, disclosure of our confidential information
and imprisonment, any of which could adversely affect our ability to operate our business and our results of operations.

Our financial statements include goodwill and an intangible asset as a result of the Merger. The intangible asset has become impaired and could
become further impaired in the future under certain conditions. In addition, goodwill could become impaired in the future under certain conditions.
Any potential future impairment of goodwill or intangible assets may significantly impact our results of operations and financial condition.

As of December 31, 2022, we had approximately $127.1 million in the aggregate of goodwill and a definite lived intangible asset from the Merger. In
accordance with generally accepted accounting principles, or GAAP, we are required annually, or more frequently upon certain indicators of impairment, to
review our estimates and assumptions underlying the fair value of our goodwill and our definite lived intangible assets when indicators of impairment are
present. Events giving rise to impairment of goodwill or intangible assets are an inherent risk in the pharmaceutical industry and often cannot be predicted.

Conditions that could indicate impairment and necessitate such a review include, but are not limited to, Auryxia’s commercial performance, our inability to
execute on our strategic initiatives, the deterioration of our market capitalization such that it is significantly below our net book value, a significant adverse
change in legal factors, unexpected adverse business conditions, and an adverse action or assessment by a regulator. To the extent we conclude that
goodwill and/or definite lived intangible assets have become impaired, we may be required to incur material write-offs relating to such impairment and any
such write-offs could have a material impact on our future operating results and financial position. For example, in the second quarter of 2020, in
connection with a routine business review, we reduced our short-term and long-term Auryxia revenue forecast. This reduction was primarily driven by the
impact of the September 2018 CMS decision that Auryxia would no longer be covered by Medicare for the treatment of the IDA Indication. While this
decision does not impact CMS coverage for the use of Auryxia for the control of serum phosphorus levels in adult patients with CKD on dialysis, or the
Hyperphosphatemia Indication, it requires

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all Auryxia prescriptions for Medicare patients to undergo a prior authorization to ensure their use of Auryxia for the Hyperphosphatemia Indication. As a
result, we recorded an impairment charge of $115.5 million during the three months ended June 30, 2020, which was entirely allocated to our only
intangible asset, the developed product rights for Auryxia, and made a corresponding adjustment to the estimated useful life of the developed product rights
for Auryxia, which we again adjusted during the three months ended December 31, 2020. The estimates, judgments and assumptions used in our
impairment testing, and the results of our testing, are discussed in Note 9 to our consolidated financial statements in Part II, Item 8. Financial Statements
and Supplementary Data of this Annual Report on Form 10-K. If these estimates, judgments and assumptions change in the future, including if the Auryxia
asset group does not meet its current forecasted projections, additional impairment charges related to goodwill or our intangible asset could be recorded in
the future and additional corresponding adjustments may need to be made to the estimated useful life of the developed product rights for Auryxia, which
could materially impact our financial position, certain of our material agreements, and our future operating results.

If product liability lawsuits are brought against us, we may incur substantial liabilities and may be required to limit commercialization of Auryxia or
vadadustat, if approved.

We face an inherent risk of product liability as a result of the clinical and commercial use of Auryxia and vadadustat. For example, we may be sued if
Auryxia or vadadustat allegedly causes injury or is found to be otherwise unsuitable during clinical trials, manufacturing, marketing or sale. Any such
product liability claims may include allegations of defects in manufacturing, defects in design, a failure to warn of dangers inherent in the product or
product candidate, negligence, strict liability and breach of warranties. Claims could also be asserted under state consumer protection acts. If we cannot
successfully defend ourselves against product liability claims, we may incur substantial liabilities or be required to limit commercialization of Auryxia or
vadadustat, if approved. Even a successful defense would require significant financial and management resources. Regardless of the merits or eventual
outcome, product liability claims may result in:

decreased demand for Auryxia or vadadustat, if approved;
injury to our reputation and significant negative media attention;

•
•
• withdrawal of clinical trial participants;
•
delay or termination of clinical trials;
•
our inability to continue to develop Auryxia or vadadustat;
•
significant costs to defend the related litigation;
•
a diversion of management’s time and our resources;
•
substantial monetary awards to study subjects or patients;
•
product recalls or withdrawals, or labeling, marketing or promotional restrictions;
•
decreased demand for Auryxia or vadadustat, if approved;
•
loss of revenue;
•
the inability to commercialize Auryxia or vadadustat, if approved; and
•
a decline in our stock price.

Failure to obtain and retain sufficient product liability insurance at an acceptable cost to protect against potential product liability claims could prevent or
inhibit the commercialization of products we develop. We currently carry product liability insurance that we believe is appropriate for our company.
Although we maintain product liability insurance, any claim that may be brought against us could result in a court judgment or settlement in an amount that
is not covered, in whole or in part, by our insurance or that is in excess of the limits of our insurance coverage. Our insurance policies also have various
exclusions, and we may be subject to a product liability claim for which we have insufficient or no coverage. If we have to pay any amounts awarded by a
court or negotiated in a settlement that exceed our coverage limitations or that are not covered by our insurance, we may not have, or be able to obtain,
sufficient capital to pay such amounts. In addition, insurance coverage is becoming increasingly expensive, and we may not be able to maintain insurance
coverage at a reasonable cost. We also may not be able to obtain additional insurance coverage that will be adequate to cover additional product liability
risks that may arise. Consequently, a product liability claim may result in losses that could be material to our business.

We will continue to incur increased costs as a result of operating as a public company, and our management will be required to devote substantial time
to compliance initiatives and corporate governance practices.

As a public company, we operate in a demanding regulatory environment, and we have and will continue to incur significant legal, accounting and other
expenses. The Sarbanes-Oxley Act of 2002, or the Sarbanes-Oxley Act, the Dodd-Frank Wall Street Reform and Consumer Protection Act, the listing
requirements of The Nasdaq Capital Market and other applicable securities rules and regulations impose various requirements on public companies,
including establishment and maintenance of effective disclosure and financial controls and certain corporate governance practices. In particular, our
compliance with Section 404 of the Sarbanes-Oxley Act has required and will continue to require that we incur substantial accounting-related expenses and

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expend significant management efforts. Our testing, or the testing by our independent registered public accounting firm, may reveal deficiencies in our
internal controls that we would be required to remediate in a timely manner. If we are not able to comply with the requirements of the Sarbanes-Oxley Act,
we could be subject to sanctions or investigations by the SEC, the Nasdaq Capital Market or other regulatory authorities, which would require additional
financial and management resources and could adversely affect the market price of our securities. Furthermore, if we cannot provide reliable financial
reports or prevent fraud, including as a result of remote working by our employees, our business and results of operations would likely be materially and
adversely affected.

We cannot predict or estimate the amount of additional costs we may incur to continue to operate as a public company, nor can we predict the timing of
such costs. These rules and regulations are often subject to varying interpretations, in many cases due to their lack of specificity and, as a result, their
application in practice may evolve over time as new guidance is provided by regulatory and governing bodies, which could result in continuing uncertainty
regarding compliance matters and higher costs necessitated by ongoing revisions to disclosure and governance practices.

Claims for indemnification by our directors and officers may reduce our available funds to satisfy successful third-party claims against us and may
reduce the amount of money available to us.

Our Ninth Amended and Restated Certificate of Incorporation, as amended, or Charter, and our Amended and Restated By-Laws, or Bylaws, as amended to
date, contain provisions that eliminate, to the maximum extent permitted by the General Corporation Law of the State of Delaware, or DGCL, the personal
liability of our directors and executive officers for monetary damages for breach of their fiduciary duties as a director or officer. Our Charter and our
Bylaws also provide that we will indemnify our directors and executive officers and may indemnify our employees and other agents to the fullest extent
permitted by the DGCL.

In addition, as permitted by Section 145 of the DGCL our Bylaws and our indemnification agreements that we have entered into with our directors and
executive officers provide that:

• We will indemnify our directors and officers, as defined in our Bylaws, for serving us in those capacities or for serving other related business

enterprises at our request, to the fullest extent permitted by Delaware law. Delaware law provides that a corporation may indemnify such person if
such person acted in good faith and in a manner such person reasonably believed to be in or not opposed to the best interests of Akebia and, with
respect to any criminal proceeding, had no reasonable cause to believe such person’s conduct was unlawful.

• We may, in our discretion, indemnify employees and agents in those circumstances where indemnification is permitted by applicable law.
• We  are  required  to  advance  expenses,  as  incurred,  to  our  directors  and  officers  in  connection  with  defending  a  proceeding,  except  that  such

•

directors or officers shall undertake to repay such advances if it is ultimately determined that such person is not entitled to indemnification.
The rights conferred in our Bylaws are not exclusive, and we are authorized to enter into indemnification agreements with our directors, officers,
employees and agents and to obtain insurance to indemnify such persons.

Any claims for indemnification made by our directors or officers could impact our cash resources and our ability to fund the business.

Our ability to use net operating losses to offset future taxable income may be subject to certain limitations.

Under Section 382 of the Internal Revenue Code, or Section 382, a corporation that undergoes an “ownership change” is subject to limitations on its ability
to utilize its pre-change net operating losses, or NOLs, to offset future taxable income. On December 12, 2018, we completed the Merger, which we believe
has resulted in an ownership change under Section 382. In addition, the Tax Cuts and Jobs Act, including amendments made by the CARES Act, includes
changes to U.S. federal tax rates and the rules governing net operating loss carryforwards that may significantly impact our ability to utilize our net
operating losses to fully offset taxable income in the future. Future changes in our stock ownership, many of which are outside of our control, could result
in an additional ownership change under Section 382. As a result, if we generate taxable income, our ability to use our pre-change NOL carryforwards to
offset federal taxable income may be subject to limitations, which could potentially result in increased future tax liability to us. At the state level, state net
operating losses generated in one state cannot be used to offset income generated in another state and there may be periods during which the use of NOL
carryforwards is suspended or otherwise limited, which could accelerate or permanently increase state taxes owed.

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Furthermore, our ability to utilize our NOLs is conditioned upon our attaining profitability and generating U.S. taxable income. As described above under
“—Risks Related to our Financial Position, Need for Additional Capital and Growth Strategy,” we have incurred significant net losses since our inception
and anticipate that we will continue to incur significant losses for the foreseeable future; thus, we do not know whether or when we will generate the U.S.
taxable income necessary to utilize our NOLs.

Our Charter designates the Court of Chancery of the State of Delaware as the sole and exclusive forum for certain types of actions and proceedings
that may be initiated by our stockholders, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us or our
directors, officers or employees.

Our Charter provides that, subject to limited exceptions, the Court of Chancery of the State of Delaware will be the sole and exclusive forum for (i) any
derivative action or proceeding brought on our behalf, (ii) any action asserting a claim of breach of a fiduciary duty owed by any of our directors, officers
or other employees to us or our stockholders, (iii) any action asserting a claim against us arising pursuant to any provision of the DGCL our Charter or our
Bylaws, or (iv) any other action asserting a claim against us, our directors, officers or other employees that is governed by the internal affairs doctrine.
Under our Charter, this exclusive forum provision will not apply to claims that are vested in the exclusive jurisdiction of a court or forum other than the
Court of Chancery of the State of Delaware, or for which the Court of Chancery of the State of Delaware does not have subject matter jurisdiction. For
instance, the provision would not apply to actions arising under federal securities laws, including suits brought to enforce any liability or duty created by
the Exchange Act, or the rules and regulations thereunder. Any person or entity purchasing or otherwise acquiring any interest in shares of our capital stock
shall be deemed to have notice of and to have consented to the provisions of our Charter described above. This choice of forum provision may limit a
stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or our directors, officers or other employees, which may
discourage such lawsuits against us and our directors, officers and employees. Alternatively, if a court were to find these provisions of our Charter
inapplicable to, or unenforceable with respect to, one or more of the specified types of actions or proceedings, we may incur additional costs associated
with resolving such matters in other jurisdictions, which could adversely affect our business and financial condition.

We are currently subject to legal proceedings that could result in substantial costs and divert management's attention, and we could be subject to
additional legal proceedings.

We are currently subject to legal proceedings, including those described in Part I, Item 3. Legal Proceedings in this Annual Report on Form 10-K, and
additional claims may arise in the future. In addition, securities class action and derivative lawsuits and other legal proceedings are often brought against
companies for any of the risks described in this Annual Report on Form 10-K following a decline in the market price of their securities. For example, we
were party to a putative class action lawsuit in state court filed by purported Keryx stockholders challenging the disclosures made in connection with the
Merger, including those that relate to vadadustat’s safety, approvability and commercial viability. Oral argument was held on October 7, 2022, and the
Court dismissed the complaint without prejudice on October 17, 2022, giving plaintiffs thirty days to amend their complaint. On November 16, 2022,
plaintiffs filed an amended consolidated complaint, asserting the same claims and seeking the same relief as the consolidated complaint. On January 18,
2023, defendants moved to dismiss the amended consolidated complaint in its entirety. Briefing on defendants’ motion to dismiss is scheduled to be
completed by April 5, 2023. In connection with any litigation or other legal proceedings, we could incur substantial costs, and such costs and any related
settlements or judgments may not be covered by insurance. Monetary damages or any other adverse judgment would have a material adverse effect on our
business and financial position. In addition, if other resolution or actions taken as a result of legal proceedings were to restrain our ability to operate or
market our products and services, our consolidated financial position, results of operations or cash flows could be materially adversely affected. We could
also suffer an adverse impact on our reputation, negative publicity and a diversion of management’s attention and resources, which could have a material
adverse effect on our business.

Risks Related to our Common Stock

Our stock price has been and may continue to be volatile, which could result in substantial losses for holders or future purchasers of our common stock
and lawsuits against us and our officers and directors.

Our stock price has been and will likely continue to be volatile. The stock market in general and the market for similarly situated biopharmaceutical
companies specifically have experienced extreme volatility that has often been unrelated to the operating performance of particular companies. Since our
initial public offering in March 2014, the price of our common stock as reported on The Nasdaq Stock Market has ranged from a low of $0.24 on October
24, 2022 to a high of $31.00 on June 20, 2014. The daily closing market price for our common stock varied between a high price of $2.93 on March 9,
2022 and a low price of $0.25 on November 17, 2022 in the twelve-month period ending on December 31, 2022. During that time, the price of our common
stock ranged from an intra-day low of $0.24 per share to an intra-day high of $2.93 per share. The market price of shares of our common stock could be
subject to wide fluctuations in response to many risk factors listed in this section,

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including, among others, developments related to and results of our research or clinical trials, developments related to our regulatory submissions and
meetings with regulatory authorities, in particular as it relates to vadadustat, commercialization of Auryxia, vadadustat, if and as approved in the U.S. and
foreign markets including Europe, and any other product candidates, announcements by us or our competitors of significant transactions or strategic
collaborations, negative publicity around Auryxia or vadadustat, regulatory or legal developments in the United States and other countries, developments or
disputes concerning our intellectual property, the recruitment or departure of key personnel including as a result of our recent reduction in workforce, actual
or anticipated changes in estimates as to financial results, changes in the structure of healthcare payment systems, market conditions in the
biopharmaceutical sector and other factors beyond our control. As a result of this volatility, our stockholders may not be able to sell their common stock at
or above the price at which they purchased it.

In addition, companies that have experienced volatility in the market price of their stock have frequently been the subject of securities class action and
shareholder derivative litigation. See Part I, Item 3. Legal Proceedings of this Annual Report on Form 10-K for information concerning securities class
action initiated against Keryx and certain current and former directors and officers of ours and Keryx’s. In addition, we could be the target of other such
litigation in the future. Class action and shareholder derivative lawsuits, whether successful or not, could result in substantial costs, damage or settlement
awards and a diversion of our management’s resources and attention from running our business, which could materially harm our reputation, financial
condition and results of operations.

The issuance of additional shares of our common stock or the sale of shares of our common stock by any of our directors, officers or significant
stockholders will dilute our stockholders’ ownership interest in Akebia and may cause the market price of our common stock to decline.

Most of our outstanding common stock can be traded without restriction at any time. As such, sales of a substantial number of shares of our common stock
in the public market could occur at any time. These sales, or the perception in the market that the holders of a large number of shares intend to sell such
shares, could reduce the market price of our common stock.

As of December 31, 2022 and based on the amounts reported in the most recent filings made under Section 13(d) and 13(g) of the Securities Exchange Act
of 1934, as amended, or the Exchange Act, Satter Management Co., L.P., or Satter, beneficially owned approximately 8.2% of our outstanding shares of
common stock, the Vanguard Group, or Vanguard, beneficially owned approximately 6.1% of our outstanding shares of common stock, and CSL Vifor
beneficially owned approximately 4.1% of our outstanding shares of common stock. By selling a large number of shares of common stock, Satter or
Vanguard could cause the price of our common stock to decline. The shares beneficially owned by CSL Vifor have not been registered pursuant to the
Securities Act and were issued and sold in reliance upon the exemption from registration contained in Section 4(a)(2) of the Securities Act and Rule 506
promulgated thereunder, but if they are registered in the future, those shares would become freely tradable and, if a large portion of such shares are sold,
could cause the price of our common stock to decline.

We have a significant number of shares that are subject to outstanding options and restricted stock units, and in the future we may issue additional options,
restricted stock units, or other derivative securities convertible into our common stock. The exercise or vesting of any such options, restricted stock units, or
other derivative securities, and the subsequent sale of the underlying common stock, could cause a further decline in our stock price. These sales also might
make it difficult for us to sell equity securities in the future at a time and at a price that we deem appropriate. Such sales of our common stock could result
in higher than average trading volume and may cause the market price for our common stock to decline.

In addition, we currently have on file with the SEC a shelf registration statement, which allows us to offer and sell up to $300 million in registered
securities, such as common stock, preferred stock, debt securities, warrants and units, from time to time pursuant to one or more offerings at prices and
terms to be determined at the time of sale, including a sales agreement prospectus that covers the offering, issuance and sale by us of up to a maximum
aggregate offering price of up to $26 million of our common stock that may be issued and sold from time to time under a sales agreement with Jefferies
LLC.

Sales of substantial amounts of shares of our common stock or other securities by our employees or our other stockholders or by us under our shelf
registration statement, pursuant to at-the-market offerings or otherwise, could dilute our stockholders, lower the market price of our common stock and
impair our ability to raise capital through the sale of equity securities.

Our executive officers, directors and principal stockholders maintain the ability to significantly influence all matters submitted to stockholders for
approval.

As of December 31, 2022, our executive officers, directors and principal stockholders, in the aggregate, beneficially owned shares representing a
significant percentage of our capital stock. As a result, if these stockholders were to choose to act together, they would be able to significantly influence all
matters submitted to our stockholders for approval, as well as our management and affairs. For example, these persons could significantly influence the
election of directors and approval of any merger,

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consolidation or sale of all or substantially all of our assets. This concentration of voting power could delay or prevent an acquisition of our company on
terms that other stockholders may desire.

Provisions in our organizational documents and Delaware law may have anti-takeover effects that could discourage an acquisition of us by others,
even if an acquisition would be beneficial to our stockholders, and may prevent attempts by our stockholders to replace or remove our current
management.

Provisions in our Charter and our Bylaws contain provisions that may have the effect of discouraging, delaying or preventing a change in control of us or
changes in our management. These provisions could also limit the price that investors might be willing to pay in the future for shares of our common stock,
thereby depressing the market price of our common stock. In addition, because our Board of Directors is responsible for appointing certain members of our
management team, these provisions may frustrate or prevent any attempts by our stockholders to replace or remove our current management by making it
more difficult for stockholders to replace members of our Board of Directors. Among other things, these provisions:

•

•
•

•
•

•
•
•

•

authorize “blank check” preferred stock, which could be issued by our Board of Directors without stockholder approval and may contain voting,
liquidation, dividend and other rights superior to our common stock;
create a classified Board of Directors whose members serve staggered three-year terms;
specify that special meetings of our stockholders can be called only by our Board of Directors pursuant to a resolution adopted by a majority of the
total number of directors;
prohibit stockholder action by written consent;
establish an advance notice procedure for stockholder approvals to be brought before an annual meeting of our stockholders, including proposed
nominations of persons for election to our Board of Directors;
provide that our directors may be removed only for cause;
provide that vacancies on our Board of Directors may be filled only by a majority of directors then in office, even though less than a quorum;
require a supermajority vote of 75% of the holders of our capital stock entitled to vote or the majority vote of our Board of Directors to amend our
Bylaws; and
require a supermajority vote of 85% of the holders of our capital stock entitled to vote to amend the classification of our Board of Directors and to
amend certain other provisions of our Charter.

These provisions, alone or together, could delay or prevent hostile takeovers, changes in control or changes in our management.
In addition, Section 203 of the DGCL prohibits a publicly-held Delaware corporation from engaging in a business combination with an interested
stockholder, generally a person which together with its affiliates owns, or within the last three years has owned, 15% of our voting stock, for a period of
three years after the date of the transaction in which the person became an interested stockholder, unless the business combination is approved in a
prescribed manner.

Because we do not anticipate paying any cash dividends on our capital in the foreseeable future, capital appreciation, if any, will be our stockholders’
sole source of gain.

We have never declared or paid cash dividends on our capital stock and we currently intend to retain all of our future earnings, if any, to finance the
development and growth of our business. Any payment of cash dividends in the future would be at the discretion of our Board of Directors and would
depend on, among other things, our earnings, financial condition, capital requirements, level of indebtedness, statutory and contractual restrictions applying
to the payment of dividends and other considerations that the Board of Directors deems relevant. In addition, the terms of the Loan Agreement preclude us
from paying cash dividends and future debt agreements may preclude us from paying cash dividends. As a result, capital appreciation, if any, of our
common stock will be our stockholders’ sole source of gain for the foreseeable future.

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Item 1B. Unresolved Staff Comments

None.

Item 2. Properties
Our corporate headquarters are located in Cambridge, Massachusetts. We currently lease approximately 65,167 square feet of office and lab space in
Cambridge, Massachusetts, and 27,300 square feet of office space in Boston, Massachusetts. Excluding renewal options, the lease for our Cambridge,
Massachusetts office space expires on September 11, 2026 and the lease for the Cambridge, Massachusetts lab space expires on January 31, 2025. In
February 2022 we extended the term of the lease for our Boston, Massachusetts office space, such that the lease expires on July 31, 2031. In September
2019, we entered into an agreement to sublease the Boston office space to Foundation Medicine, Inc., which expired on February 28, 2023. We believe that
our existing facilities are adequate to meet our current needs, and that suitable additional alternative spaces will be available in the future on commercially
reasonable terms for our future growth.

Item 3. Legal Proceedings

Legal Proceedings Relating to Vadadustat

Opposition Proceedings Against Akebia

In September 2018, Dr. Reddy’s Laboratories Limited filed an opposition to our issued Indian Patent No. 287720 in the Indian Patent Office.

On July 26, 2022, Sandoz AG filed an opposition against our issued European Patent No. 3277270 in the European Patent Office.

On February 13, 2023, FibroGen, Inc., or FibroGen, filed an opposition against our issued European Patent No. 3357911 in the European Patent Office.

Proceedings Filed by Akebia Against FibroGen, Inc.

Europe

We filed an opposition in the European Patent Office, or the EPO, against FibroGen’s European Patent No. 1463823, or the ’823 EP Patent on December 5,
2013, and an oral proceeding took place March 8 and 9, 2016. Following the oral proceeding, the Opposition Division of EPO ruled that the patent as
granted did not meet the requirements for patentability under the European Patent Convention and, therefore, revoked the patent in its entirety. FibroGen
appealed that decision. On February 27, 2023, FibroGen withdrew its appeal, and the patent remains revoked.

On May 13, 2015, May 20, 2015 and July 6, 2015, we filed oppositions to FibroGen’s European Patent Nos. 2322155, or the ’155 EP Patent, 1633333, or
the ’333 EP Patent, and 2322153, or the ’153 EP Patent in the EPO, respectively, requesting the patents be revoked in their entirety. These method of use
patents do not prevent persons from using the compound for other uses, including any previously known use of the compound. In particular, these patents
do not claim methods of using any of our product candidates for purposes of inhibiting HIF-PH for the treatment of anemia due to chronic kidney disease,
or CKD. While we do not believe these patents will prevent us from commercializing vadadustat for the treatment of anemia due to CKD, we filed these
oppositions to provide us with maximum flexibility for developing vadadustat and our pipeline of investigational oral hypoxia-inducible factor prolyl
hydroxylase, or HIF-PH, inhibitor compounds.

With regard to the opposition that we filed in Europe against the ’333 EP Patent, an oral proceeding took place on December 8 and 9, 2016. Following the
oral proceeding, the Opposition Division of the EPO ruled that the patent as granted did not meet the requirements for patentability under the European
Patent Convention and, therefore, revoked the patent in its entirety. On December 9, 2016, FibroGen filed a notice to appeal the decision to revoke the ’333
EP Patent. The Board of Appeal held an oral proceeding on this appeal on February 24 and 25, 2022, during which proceeding the '333 EP Patent was
maintained in restricted form. The ‘333 EP patent was originally granted with four independent claims, one of which was found obvious on appeal. The
remaining claims are directed to: treatment of anemia of chronic disease in subjects having a percent transferrin saturation of less than 20% (claim 1),
treatment of anemia that is refractory to treatment with exogenously administered erythropoietin (claim 6), and treatment of iron deficiency (claim 15).

In oral proceedings held on May 29, 2017, regarding the ’155 EP Patent, the European Opposition Division ruled that the ’155 EP Patent as granted did not
meet the requirements for patentability under the European Patent Convention and, therefore,

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revoked the patent in its entirety. FibroGen filed a notice to appeal the decision to revoke the ’155 EP Patent on May 29, 2017. An oral proceeding for the
appeal was held on February 22, 2022, during which proceeding the Board of Appeal maintained the revocation of the ‘155 EP Patent in its entirety.

In related oral proceedings held on May 31, 2017 and June 1, 2017 for the ’153 EP Patent, the Opposition Division of the EPO maintained the patent after
FibroGen significantly narrowed the claims to an indication for which vadadustat is not intended to be developed. We and Glaxo separately filed notices to
appeal the decision to maintain the ’153 EP Patent on November 9, 2017. Bayer filed a notice to appeal the decision on November 14, 2017. Glaxo
withdrew its appeal on March 2, 2020 and Bayer withdrew its appeal on June 30, 2021. An oral proceeding for the appeal was held on February 21, 2022,
during which proceeding the Board of Appeal revoked the ‘153 patent in its entirety.

On April 3, 2019, we filed oppositions to FibroGen’s European Patent Nos. 2289531, or the ’531 EP Patent, and 2298301, or the ’301 EP Patent in the
EPO, respectively, requesting the patents be revoked in their entirety. Oral proceedings for oppositions to the two patents were held on September 7-8 and
10, 2021. Following oral proceedings, the Opposition Division of the EPO maintained certain claims in amended form in the two patents. On January 26,
2022, we filed notice to appeal the Opposition Division’s decision for ’531 EP Patent. On July 8, 2022, FibroGen filed notice to appeal the Opposition
Division’s decision for the ’301 EP Patent, which it withdrew on August 17, 2022. These two patents expired in December 2022, and we do not expect the
Opposition Division’s decision on the two patents to have any effect on our commercialization of vadadustat in Europe.

Japan

In 2018, we and our collaboration partner in Japan, Mitsubishi Tanabe Pharma Corporation, or MTPC, jointly filed a Request for Trial before the JPO to
challenge the validity of certain of FibroGen’s HIF-related patents in Japan: JP4845728, JP5474872 and JP5474741. On September 26, 2019, the JPO
conducted an invalidation trial for JP5474872 and JP4845728. On November 11, 2019, the JPO conducted an invalidation trial for JP5474741. On April 1,
2022, the JPO issued a final decision for JP4845728, which invalidated all claims except claims directed to the medical use to treat anemia that does not
respond to erythropoiesis. On May 18, 2022, the JPO issued a final decision for JP5474741 and JP5474872, which maintained the claims in amended form.
In May 2022, MTPC filed revocation lawsuits for the three patents in the Intellectual Property High Court requesting cancellation of the JPO’s decisions. In
July 2022, we filed a revocation lawsuit for JP4845728 in the Intellectual Property High Court requesting cancellation of the JPO’s decision. In August
2022, we filed revocation lawsuits for JP5474741 and JP5474872 in the Intellectual Property High Court requesting cancellation of the JPO’s decisions. In
September 2022, FibroGen filed a revocation lawsuit for JP4845728 in the Intellectual Property High Court requesting cancellation of the JPO’s decision
on the claims that were invalidated. We do not believe the JPO’s decisions will prevent our collaboration partner MTPC from continuing to commercialize
vadadustat for the treatment of anemia due to CKD in Japan.

United Kingdom

On December 13, 2018, we filed Particulars of Claim in the Patents Court of the United Kingdom to challenge the validity of FibroGen’s six HIF-related
patents in the UK: the ’823 EP Patent (UK), the ’333 EP Patent (UK), the ’153 EP Patent (UK), the ’155 EP Patent (UK), European Patent (UK) No.
2,289,531, or the ’531 EP Patent (UK), and European Patent (UK) No. 2,298,301, or the ’301 EP Patent (UK). In May 2019, Astellas Pharma Inc., or
Astellas, the exclusive licensee of FibroGen’s HIF-related patents, sued Akebia for patent infringement in the Patents Court of the UK. In September 2019,
we filed an Amended Particulars of Claim to include FibroGen’s European Patent No. 1487472, or the ’472 EP Patent (UK). On February 28, 2020, the
parties agreed to dismiss the ’472 EP Patent (UK) from the trial.

A trial was conducted in March 2020. On April 20, 2020, the Patents Court of the UK issued a judgment in favor of Akebia, which invalidated all the
claims at issue in each of the ’823 EP Patent (UK), the ’333 EP Patent (UK), the ’153 EP Patent (UK), the ’155 EP Patent (UK) and the ’301 EP Patent
(UK). The ’531 EP Patent (UK) was amended to a single claim to recite one specific compound; this claim was held to be valid but not infringed by
vadadustat. On June 11, 2020, FibroGen and Astellas appealed the Patents Court’s judgment on the invalidity of the ’823 EP Patent (UK), the ’301 EP
Patent (UK), the ’333 EP Patent (UK), the ’153 EP Patent (UK), and the ’155 EP Patent (UK) in the Court of Appeal (Civil Division). On June 8, 2021 -
June 10, 2021, the United Kingdom Court of Appeal held a three-day hearing for the appeal. On August 24, 2021, the Court of Appeal issued a judgment,
which reversed the Patents Court’s judgment on the invalidity of the ’823 EP Patent (UK) and maintained certain claims of the ’823 EP Patent (UK) and
the ’301 EP Patent (UK) in amended form, and which affirmed the Patents Court’s judgment on the invalidity of the ’333 EP Patent (UK), the ’155 EP
Patent (UK), and the ’153 EP Patent (UK). Akebia sought permission to appeal to the UK Supreme Court, which was granted on October 3, 2022. Hearing
for the appeal is scheduled for March 5-7, 2024. We do not expect the UK Court of Appeal’s judgment to have any effect on our commercialization of
vadadustat in the UK because the patents expired in December 2022.

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Stockholder Litigation Relating to the Merger

On June 28, 2018, we entered into an Agreement and Plan of Merger with Keryx and Alpha Therapeutics Merger Sub, Inc., or the Merger Sub, pursuant to
which the Merger Sub would merge with and into Keryx, with Keryx becoming a wholly owned subsidiary of ours, or the Merger. On December 12, 2018,
we completed the Merger.

On July 15, 2021, a purported former Keryx stockholder filed a putative class action in the Supreme Court of the State of New York against Akebia, a
current officer of Akebia (John P. Butler), a former officer of Akebia (Jason A. Amello), former directors of Akebia (Muneer A. Satter, Scott A. Canute,
Michael D. Clayman, Maxine Gowen, Duane Nash, Ronald C. Renaud, Jr., and Michael S. Wyzga), a current director of Akebia (Cynthia Smith), a former
director and officer of Keryx (Jodie P. Morrison), a former officer of Keryx (Scott A. Holmes) and former directors of Keryx (Michael Rogers, Kevin J.
Cameron, Steven C. Gilman, Daniel P. Regan, Mark J. Enyedy, and Michael T. Heffernan, some of whom are current members of our Board of Directors).
The action is captioned Loper v. Akebia Therapeutics, Inc., et al., or the Loper Action. The complaint in the Loper Action alleges that the registration
statement filed in connection with the Merger contained allegedly false and misleading statements or failed to disclose certain allegedly material
information in violation of Section 11, 12(a)(2), and 15 of the Securities Act of 1933, as amended. It alleges, among other things, that Akebia failed to
disclose heightened safety risks that allegedly threatened the prospects of the Phase 3 PRO2TECT clinical trial and the commercial viability of vadadustat.
The complaint in the Loper Action seeks damages including interest thereon, an award of plaintiffs’ and the class’s costs and expenses, including counsel
fees and expert fees, and rescission, disgorgement, or such other equitable or injunctive relief that the Court deems appropriate.

On August 16, 2021, another purported former Keryx stockholder filed a putative class action making substantially similar allegations and asserting the
same claims as the Loper Action, also in the Supreme Court of the State of New York against Akebia and many of the same individual defendants named in
the Loper Action. The action is captioned Panicho v. Akebia Therapeutics, Inc., et al., or the Panicho Action.

On September 13, 2021, the parties in the Loper Action and Panicho Action entered into a joint stipulation and proposed order, which provided for the
consolidation of the two actions under the caption In re Akebia Therapeutics, Inc. Securities Litigation, or the Consolidated State Action. On October 27,
2021, plaintiffs filed a consolidated complaint in the Consolidated State Action. On January 10, 2022, defendants moved to dismiss the consolidated
complaint in its entirety. Briefing on defendants’ motion to dismiss was completed on April 22, 2022. Oral argument was held on October 7, 2022, and the
Court dismissed the complaint without prejudice on October 17, 2022, giving plaintiffs thirty days to amend their complaint. On November 16, 2022,
plaintiffs filed an amended consolidated complaint, asserting the same claims and seeking the same relief as the consolidated complaint. On January 18,
2023, defendants moved to dismiss the amended consolidated complaint in its entirety, and the plaintiffs filed their opposition on March 6, 2023. Briefing
on defendants’ motion to dismiss is scheduled to be completed by April 5, 2023.

We deny any allegations of wrongdoing and intend to continue vigorously defending against the one active stockholder lawsuit described in this Legal
Proceedings section, the Consolidated State Action. There is no assurance, however, that we will be successful in the defense of this action, or any
associated appeals, or that insurance will be available or adequate to fund any settlement or judgment or the litigation costs of this action. Moreover, we are
unable to predict the outcome or reasonably estimate a range of possible losses at this time. A resolution of the Consolidated State Action in a manner
adverse to us, however, could have a material effect on our financial position and results of operations in the period in which the action is resolved.

Item 4. Mine Safety Disclosures

Not applicable.

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Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Market Information

Our common stock is traded on The Nasdaq Capital Market under the symbol “AKBA”.

PART II

Holders

At February 17, 2023, there were approximately 28 holders of record of our common stock. The actual number of holders of our common stock is greater
than this number of record holders, and includes stockholders who are beneficial owners, but whose shares are held in street name by brokers or held by
other nominees. This number of holders of record also does not include stockholders whose shares may be held in trust by other entities.

Dividends

We have never declared or paid any cash dividends on our common stock. We currently intend to retain earnings, if any, for use in our business and do not
anticipate paying cash dividends on our common stock in the foreseeable future. In addition, the terms of our loan agreement with funds managed by
Pharmakon Advisors, LP preclude us from paying cash dividends and future debt agreements may preclude us from paying cash dividends. Payment of
future dividends, if any, on our common stock will be at the discretion of our Board of Directors after taking into account various factors, including our
financial condition, operating results, anticipated cash needs, and plans for expansion.

Issuer Purchases of Equity Securities

None.

Recent Sales of Unregistered Securities

None.

Purchases of Equity Securities by the Issuer and Affiliated Purchasers

None.

Comparative Stock Performance Graph

The following performance graph and related information shall not be deemed to be “soliciting material” or “filed” with the SEC or subject to Regulation
14A or 14C, or to the liabilities of Section 18 of the Exchange Act, except to the extent that we specifically request that this information be treated as
soliciting material or we specifically incorporate it by reference into a filing under the Securities Act of 1933, as amended, or the Exchange Act.

Set forth below is a graph* comparing the total cumulative returns of Akebia Therapeutics, Inc., the Nasdaq** Composite Index and the Nasdaq
Biotechnology Index. The graph assumes $100 was invested on December 31, 2017 in our common stock and each of the indices and that all dividends, if
any, are reinvested. The performance shown represents past performance and should not be considered an indication of future performance.

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     *Prepared by Zack's Investment Research, Inc. Used with permission. All rights reserved. Copyright 1980-2023
**Index Data: Copyright NASDAQ OMX, Inc. Used with permission. All rights reserved.

Securities Authorized for Issuance under Equity Compensation Plans

Information about our equity compensation plans is incorporated herein by reference to Item 12, Security Ownership of Certain Beneficial Owners and
Management and Related Stockholder Matters, of this Annual Report on Form 10-K.

Item 6. [Reserved]

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

You should read the following discussion and analysis of our financial condition and results of operations together with our consolidated financial
statements and related notes appearing elsewhere in this Annual Report on Form 10-K. Some of the information contained in this discussion and analysis,
including information with respect to our plans and strategy for our business, includes forward-looking statements that involve significant risks and
uncertainties. As a result of many factors, including those factors set forth in the “Risk Factors” section of this Annual Report on Form 10-K, our actual
results could differ materially from the results described in or implied by the forward-looking statements contained in the following discussion and
analysis. Please also refer to the section under the heading “Note Regarding Forward-Looking Statements.”

Business Overview

We are a fully integrated biopharmaceutical company committed to addressing patients’ unmet needs. Since our initial public offering in 2014, we have
built a business focused on developing and commercializing innovative therapeutics that we believe serves as a foundation for future growth. Our purpose
is to better the life of each person impacted by kidney disease, and we have established ourselves as a leader in the kidney community. We believe our
demonstrated ability to deliver value broadly to the kidney community has enabled us to build a sustainable company. While our current focus centers on
people living with kidney disease, we believe our continued commitment to our products and pipeline assets, focusing on all patients who can realize a
meaningful benefit from our medicines, will result in delivering value for shareholders.

Our current portfolio includes:

•

Auryxia® (ferric citrate), a medicine approved and marketed in the United States for two indications: (1) the control of serum phosphorus levels
in adult patients with dialysis dependent chronic kidney disease, or DD-CKD, or the

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•

Hyperphosphatemia Indication, and (2) the treatment of iron deficiency anemia, or IDA, in adult patients with non-dialysis-dependent chronic
kidney disease, or NDD-CKD. The product is also available in Japan and Taiwan.
Vafseo™ (vadadustat), an oral hypoxia-inducible factor prolyl hydroxylase, or HIF-PH, inhibitor, is approved in Japan for the treatment of anemia
due to chronic kidney disease, or CKD, in adult patients. Vadadustat is under regulatory review for the treatment of anemia due to CKD in Europe,
where it has received a positive opinion from the Committee for Medicinal Products for Human Use, or CHMP, of the European Medicines
Agency, or EMA, in adult patients on dialysis. Vadadustat is also under regulatory review for the treatment of anemia due to CKD in Australia,
Korea, Taiwan and other countries. We continue to pursue a path to potentially gain approval for vadadustat in the U.S. Further, we have several
lifecycle management and indication expansion opportunities currently under evaluation or in development for vadadustat.

• HIF-PH inhibitors in preclinical development. The discovery of hypoxia-inducible factor, or HIF, laid the foundation to explore the central role
of oxygen sensing in many diseases. As we have seen through the development of vadadustat as a treatment for anemia due to CKD, when
stabilized, HIF triggers wide-ranging adaptive, protective responses during hypoxic or ischemic conditions. Our clinical team and research
scientists are eager to further develop HIF-PH inhibitors for various indications including acute kidney injury, or AKI, and retinopathy of
prematurity, or ROP.

We continue to explore additional commercial and development opportunities to expand our pipeline and portfolio of novel therapeutics through both
internal research and external innovation to leverage our fully integrated team.

Auryxia

Today we market Auryxia in the United States with our well-established, nephrology-focused commercial organization. Auryxia is a non-calcium, non-
chewable, orally administered tablet that was approved for marketing by the U.S. Food and Drug Administration, or FDA, in September 2014 as a
phosphate binder for the Hyperphosphatemia Indication and was commercially launched in the United States shortly thereafter. In November 2017,
Auryxia received marketing approval from the FDA for a second indication, the treatment of iron deficiency anemia, and was commercially launched for
this indication in the United States shortly thereafter. Our Japanese sublicensee, Japan Tobacco, Inc., or JT, and its subsidiary, Torii Pharmaceutical Co.,
Ltd., or Torii, commercialize ferric citrate hydrate as Riona® in Japan. Averoa SAS, or Averoa, has an exclusive license to develop and commercialize
ferric citrate in the European Economic Area, or EEA, Turkey, Switzerland and the United Kingdom.

In 2022, Auryxia product revenue increased approximately 24.5% over 2021 due to the company’s focus on implementing a new contracting strategy in
late 2021. Since 2018, Auryxia product revenue has grown at a compounded annual growth rate of approximately 17% due to market share gains and
improved net price per pill, despite a 13% decline in total prescriptions for phosphate binders in the United States since 2018.

Vadadustat

We are seeking regulatory approval in the European Union and the United States for vadadustat as an oral treatment of anemia in adult DD-CKD patients.
We and Mitsubishi Tanabe Pharma Corporation, or MTPC, are also seeking regulatory approval for vadadustat as a treatment for anemia in adult DD-CKD
and NDD-CKD patients in the United Kingdom, Switzerland and Australia, and Korea and Taiwan, respectively.

Vadadustat is currently pending an European Commission, or EC, approval decision. On February 23, 2023, the CHMP of the EMA adopted a positive
opinion recommending the EC approve Vafseo™ for the treatment of symptomatic anemia associated with CKD in adults on chronic maintenance dialysis.
We anticipate that the EC will issue a decision on the marketing authorization for Vafseo in May 2023, which would be applicable to all 27 European
Union member states and Iceland, Norway and Liechtenstein. Following the termination of our U.S. and international collaboration agreements with
Otsuka in June 2022, we regained full rights to vadadustat in Europe, Australia, China, Canada, Latin America, the Middle East and Russia. As we do not
have a commercial presence in Europe, we are seeking a partner in Europe and will support the partner’s launch of vadadustat, if approved. We are seeking
to identify and secure a partner that can effectively facilitate treatment of as many people as would benefit from vadadustat, if approved, thus maximizing
the value of the asset.

We submitted a New Drug Application, or NDA, to the FDA for vadadustat in March of 2021. On March 29, 2022, the FDA issued a complete response
letter, or CRL, to our NDA for vadadustat. The FDA concluded that the data in the NDA do not

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support a favorable benefit-risk assessment of vadadustat for dialysis and non-dialysis patients. The FDA expressed safety concerns noting failure to meet
non-inferiority in MACE in the non-dialysis patient population, the increased risk of thromboembolic events, driven by vascular access thrombosis in
dialysis patients, and the risk of drug-induced liver injury. We believe there are compelling data supporting a positive benefit-risk profile for the use of
vadadustat broadly in patients with CKD, including non-dialysis patients though we have always remained cautious about receiving a broad label for
vadadustat that would extend to non-dialysis patients with anemia due to CKD. As such, we began the process to dispute the FDA ruling, and in October
2022, we submitted a Formal Dispute Resolution Request, or FDRR, with the FDA regarding the CRL, specifically related to DD-CKD adult patients. The
appeal focused on the favorable balance of the benefits and risks of vadadustat for the treatment of adult DD-CKD patients in light of safety concerns
expressed by the FDA in the CRL related to the rate of adjudicated thromboembolic events driven by vascular access thrombosis for vadadustat compared
to the active comparator and the risk of drug-induced liver injury. In February 2023, we received a second interim response from the FDA to our FDRR,
which is still under consideration by the FDA at the time of this filing.

Following the termination of our collaboration agreement with Otsuka Pharmaceutical Co. Ltd., or Otsuka, we own full rights to vadadustat in the U.S.,
subject to our licensing agreement with Vifor (International) Ltd. (now a part of CSL Limited), or CSL Vifor. If we obtain FDA approval of vadadustat for
DD-CKD adult patients, we plan to commercialize vadadustat in the United States with CSL Vifor.

Leveraging our learnings from the research and development of vadadustat, and a breadth of scientific expertise on the HIF pathway, we believe there is
potential to leverage HIFs to treat other hypoxic conditions and to explore the use of HIFs in acute settings. We believe this potential applies to vadadustat
as well as other preclinical assets we are internally developing.

Regarding broader uses of vadadustat, in July 2020 we partially funded an investigator-sponsored clinical study conducted by The University of Texas
Health Science Center at Houston, or UTHealth, in Houston, Texas, evaluating the use of vadadustat as a potential therapy to prevent and treat acute
respiratory distress syndrome, or ARDS, in adult patients who have been hospitalized due to COVID-19 and hypoxemia (O2 saturation ≤94%). The study
was a phase 2, randomized, double-blind, placebo-controlled trial that measured the proportion of patients who had scores of 6, 7, or 8 on the National
Institute of Allergy and Infectious Disease Ordinal Scale, or NIAID-OS, at Day 7 and Day 14, with Day 14 being the primary endpoint. While the study
missed the primary endpoint, the data, detailed in the Clinical Development Program section, were encouraging. For reference, subjects receiving
vadadustat demonstrated 94% probability for conferring benefit on the NIAID-OS at Day 14, slightly below the primary superiority threshold of >95%
probability. We believe vadadustat has the potential to prevent the worsening of ARDS more broadly since the mechanism underlying the benefits are not
specific to COVID-19, and we will further explore vadadustat in an acute care setting.

Operating Overview

We have incurred net losses in each year since inception. Our net losses were $92.6 million, $282.8 million and $383.5 million for the years ended
December 31, 2022, 2021 and 2020, respectively. Substantially all of our net losses resulted from costs incurred in connection with the continued
commercialization of Auryxia and development efforts relating to vadadustat, including conducting clinical trials of, and seeking regulatory approval for,
vadadustat, providing general and administrative support for these operations and protecting our intellectual property.

Our ability to achieve profitability depends in part on our ability to manage our expenses. Following receipt of the CRL, in April 2022 and May 2022, we
implemented a reduction of our workforce by approximately 42% across all areas of our company including several members of management (47%
inclusive of the closing of the majority of open positions). These actions reflect our determination to refocus our strategic priorities around our commercial
product, Auryxia®, and our development portfolio, and are steps in a cost savings plan to significantly reduce our expense profile. The workforce reduction
included net charges totaling approximately $14.5 million, including costs for one-time termination benefits and contractual termination benefits for
severance, healthcare, and related benefits of $11.3 million and non-cash stock-based compensation expense of $3.2 million. On November 7, 2022, we
implemented a further reduction in workforce by approximately 14% consisting solely of individuals within the commercial organization as a result of our
decision to shift to a strategic account management focused model for our commercial efforts. The workforce reduction included net charges totaling
approximately $1.4 million, primarily related to one-time and contractual termination benefits including severance, non-cash stock-based compensation
expense, healthcare and related benefits in the fourth quarter of 2022. During the year ended December 31, 2022, we recognized an aggregate of $15.9
million of restructuring charges in the consolidated statement of operations and comprehensive loss. See Note 5 to our consolidated financial statements in
Part II, Item 8. Financial Statements and Supplementary Data of this Annual Report on Form 10-K for further details of the reductions in workforce.

We expect to continue to incur additional operating expenses, including additional research and development expenses to our pipeline, additional costs
related to vadadustat, and research and development and selling, general and administrative expenses

103

for ongoing development and commercialization of Auryxia, which could lead to operating losses for the foreseeable future. In addition to any additional
costs not currently contemplated due to the events associated with or resulting from the workforce reductions noted above, our ability to achieve
profitability and our financial position will depend, in part, on the rate of our future expenditures, on our product revenue from Auryxia, our collaboration
revenue, our ability to successfully implement cost avoidance measures and reduce overhead costs and our ability to obtain additional funding. We expect
to continue to incur significant expenses if and as we:

•

•

•

•

•

•

•

•

•

•

•

•

•

•

continue our commercialization activities for Auryxia and vadadustat, if we are able to obtain marketing approval for vadadustat
following receipt of the CRL from the FDA in March 2022, and any other product or product candidate, including those that may be in-
licensed or acquired;

address the issues identified in the CRL for vadadustat that we received from the FDA and pursue our appeal of the CRL for vadadustat
with the FDA;

conduct and enroll patients in any clinical trials, including post-marketing studies or any other clinical trials for Auryxia, vadadustat or
any other product or product candidate, including those that may be in-licensed or acquired;

seek marketing approvals for vadadustat and any other product candidate, including those that may be in-licensed or acquired;

maintain marketing approvals for Auryxia and vadadustat, if we are able to obtain marketing approval for vadadustat following receipt of
the CRL from the FDA in March 2022, and any other product, including those that may be in-licensed or acquired;

manufacture Auryxia, vadadustat and any other product or product candidate, including those that may be in-licensed or acquired, for
commercial sale and clinical trials;

conduct discovery and development activities for additional product candidates or platforms that may lead to the discovery of additional
product candidates;

engage in transactions, including strategic, merger, collaboration, acquisition and licensing transactions, pursuant to which we would
market and develop commercial products, or develop and commercialize other product candidates and technologies;

continue to repay, and pay any associated pre-payment penalties, if applicable, the senior secured term loans in an aggregate principal
amount of $67.0 million as of December 31, 2022, or the Term Loans, that were made available to us pursuant to the Loan Agreement;

make royalty, milestone or other payments under our license agreements and any future license agreements;

maintain, protect and expand our intellectual property portfolio;

make decisions with respect to our personnel, including the retention of key employees;

make decisions with respect to our infrastructure, including to support our operations as a fully integrated publicly traded
biopharmaceutical company; and

experience any additional delays or encounter issues with any of the above.

We have not generated, and may not generate, enough product revenue to realize net profits from product sales. We have no manufacturing facilities, and
all of our manufacturing activities are contracted out to third parties. Additionally, we currently utilize contract research organizations, or CROs, to carry
out our clinical development activities. If we obtain marketing approval for vadadustat, and as we continue to commercialize Auryxia, we expect to incur
significant commercialization expenses related to product sales, marketing, manufacturing and distribution. We expect to finance future cash needs through
product revenue, public or private equity or debt transactions, royalty transactions, strategic transactions, or a combination of these approaches. If we are
unable to raise additional capital in sufficient amounts when needed or on attractive terms, we may not be able to pursue development and commercial
activities related to Auryxia and vadadustat, if approved, or any additional products and product candidates, including those that may be in-licensed or
acquired. Any of these events could significantly harm our business, financial condition and prospects.

From inception through December 31, 2022, we raised approximately $793.5 million of net proceeds from the sale of equity, including $519.8 million from
various underwritten public offerings, $223.7 million from at-the-market offerings, or ATM offerings, pursuant to prior sales agreements with Cantor
Fitzgerald & Co., and $70.0 million from the sale of 7,571,429 shares of common stock to CSL Vifor. As of December 31, 2022, through our collaboration
agreement with MTPC and our prior collaboration agreements with Otsuka, we received approximately $837.1 million in cost-share funding, and are not
entitled to

104

receive any additional cost-share funding. On June 30, 2022, we entered into a Termination and Settlement Agreement, or the Termination Agreement, with
Otsuka, pursuant to which we received a nonrefundable and non-creditable payment of $55.0 million in consideration for the covenants and agreements set
forth in the Termination Agreement.

On November 11, 2019, we entered into a loan agreement, or the Loan Agreement, with funds managed by Pharmakon Advisors LP, or Pharmakon,
pursuant to which term loans in an aggregate principal amount of $100.0 million were made available to us in two tranches, subject to certain terms and
conditions, or the Term Loans. On July 15, 2022, or the Effective Date, we entered into the Second Amendment and Waiver with BioPharma Credit PLC,
or the Collateral Agent, BPCR Limited Partnership, as a Lender, and BioPharma Credit Investments V (Master) LP, as a Lender, or the Second Amendment
and Waiver, which amends and waives certain provisions of the Loan Agreement as amended by the First Amendment and Waiver between the Collateral
Agent, the Lenders and us, dated February 18, 2022. The Collateral Agent and the Lenders are collectively referred to as Pharmakon. Pursuant to the
Second Amendment and Waiver, we made prepayments totaling $25.0 million together with a prepayment premium of $0.5 million plus all accrued and
unpaid interest on such prepayments of principal to the Effective Date, and Pharmakon agreed to waive or modify certain covenants in the Loan
Agreement. In addition, on February 25, 2021, we received an upfront payment of $44.8 million (net of certain transaction expenses) in connection with
our sale to HealthCare Royalty Partners IV, L.P., or HCR, of the right to receive all royalties and sales milestones payable to us under our collaboration
agreement with MTPC, or the MTPC Agreement, subject to certain caps and other terms and conditions described in Note 6 to our consolidated financial
statements in Part II, Item 8. Financial Statements and Supplementary Data of this Annual Report on Form 10-K. Finally, on February 18, 2022, we entered
into a Second Amended and Restated License Agreement, or the Vifor Second Amended Agreement, with CSL Vifor. Pursuant to the Vifor Second
Amended Agreement, CSL Vifor made an upfront payment to us of $25.0 million in lieu of the previously disclosed milestone payment of $25.0 million
that CSL Vifor was to pay to us following approval of vadadustat by the FDA. Also pursuant to the Vifor Second Amended Agreement, Vifor contributed
$40 million to a working capital fund established to partially fund our costs of purchasing vadadustat from our contract manufacturers, or the Working
Capital Fund, which amount of funding will fluctuate, and which funding we are required to repay to CSL Vifor over time.

Impacts of COVID-19 Pandemic

The COVID-19 pandemic has presented a substantial public health and economic challenge around the world and continues to affect our patients,
healthcare providers with whom we interact, customers, collaboration partners, CROs, contract manufacturing organizations, or CMOs, vendors,
communities and business operations.

We believe our revenue growth was negatively impacted by the COVID-19 pandemic in 2021 and 2022 primarily as the CKD patient populations that we
serve experienced both high hospitalization and mortality rates due to COVID-19, and the pandemic had an adverse impact on the phosphate binder market
in which Auryxia competes. Labor shortages and costs have adversely impacted dialysis providers. These impacts have refocused clinical efforts in
addressing bone and mineral disorders like hyperphosphatemia to more acute operational issues to ensure patients receive dialysis treatments and still some
patients have been rescheduled or missed treatments due to labor shortages. We believe, this and potentially other factors, has led to the reduction in the
phosphate binder market, which has not experienced growth since early 2020. While we are unable to quantify the impact of the COVID-19 pandemic on
future revenues and revenue growth, the COVID-19 pandemic and the ongoing impacts from the COVID-19 pandemic continue to adversely and
disproportionately impact CKD patients and the phosphate binder market; therefore, we expect the COVID-19 pandemic and the ongoing impacts from the
pandemic to continue to have a negative impact on our revenue growth for the foreseeable future.

In addition, several healthcare facilities have previously restricted access for non-patients, including the members of our sales force. For example, DaVita,
Inc., or DaVita, and Fresenius Medical Care, or Fresenius, which account for a vast majority of the dialysis population in the United States, have previously
restricted access to their clinics. As a result, we continue to engage with some healthcare providers and other customers virtually, where possible. The
restrictions on our customer-facing employees' in-person interactions with healthcare providers have, and could continue to, negatively impact our access to
healthcare providers and, ultimately, our sales, including with respect to vadadustat, if approved. Recently, such precautionary measures have been relaxed
at certain healthcare facilities and, as a result, members of our sales force have resumed in person interactions with certain customers. Nevertheless, some
restrictions remain, and more restrictions may be put in place again due to a resurgence in COVID-19 cases, including those involving new variants of
COVID-19 which may be more contagious and more severe than prior strains of the virus. Given this uncertain environment and the disproportionate
impact of the COVID-19 pandemic on CKD patients, we are actively monitoring the demand in the United States for Auryxia and will be for vadadustat, if
approved, including the potential for further declines or changes in prescription trends and customer orders, which could have a material adverse effect on
our business, results of operations and financial condition.

In addition, the direct and indirect impacts of the pandemic or the response efforts to the pandemic, including, among others, competition for labor and
resources and increases in labor, sourcing, manufacturing and shipping costs, may cause disruptions to, closures of, or other impacts on our CMOs and
other vendors in our supply chain on which we rely for the supply of our

105

products and product candidates. For example, areas of China have recently continued to implement lockdowns for COVID-19, which could impact the
global supply chain. At this time, our third party contract manufacturers continue to operate at or near normal levels. However, it is possible that the
COVID-19 pandemic and response efforts may have an impact in the future on our contract manufacturers' ability to manufacture and deliver Auryxia and
vadadustat (if approved in the United States and EMA and which is currently marketed under the trade name Vafseo  by MTPC in Japan), which may
result in increased costs and delays, or disruptions to the manufacturing and supply of our products and product candidates.

TM

COVID-19 pandemic precautions have caused moderate delays in enrolling new clinical trials and may cause delays in enrolling other new clinical trials.
We are using remote monitoring and central monitoring, where possible.

This uncertain pandemic environment has presented new risks to our business. While we are working aggressively to mitigate the impacts on our business,
we are mindful that many of these risks and the impact to the larger healthcare market are outside of our control.

For additional information on the various risks posed by the COVID-19 pandemic, please refer to Part I, Item 1A. Risk Factors.

Financial Overview

Revenue

To date, our revenues have been derived from product revenue from commercial sales of Auryxia, collaboration revenues, which include license and
milestone payments, royalty and cost-sharing revenue generated through collaboration and license agreements with partners for the development and
commercialization of vadadustat, a nonrefundable, non-creditable termination fee pursuant to the terms of the Termination Agreement with Otsuka, and
royalty revenue from sales of Riona in Japan. Cost-sharing revenue represents amounts reimbursed by our collaboration partners for expenses incurred by
us for research and development activities and, potentially, co-promotion activities, under our collaboration agreements.

We expect our revenue to continue to be generated primarily from our commercial sales of Auryxia, our collaborations with MTPC and Japan Tobacco,
Inc., and its subsidiary, Torii Pharmaceutical Co., Ltd., collectively JT and Torii, and any other collaborations into which we may enter. We will not
recognize any future revenue pursuant to our former collaboration with Otsuka.

Cost of Goods Sold

Cost of goods sold includes direct costs to manufacture commercial drug substance and drug product for Auryxia, as well as indirect costs, including costs
for packaging, shipping, insurance and quality assurance, idle capacity charges, write-offs for inventory that fails to meet specifications or is otherwise no
longer suitable for commercial sale, changes in our excess purchase commitment liability, and royalties due to the licensor of Auryxia related to U.S. and
Japan product sales recognized during the period. Cost of goods sold also includes costs to manufacture drug product provided to MTPC for commercial
sale of Vafseo in Japan.

As a result of the Merger and the application of purchase accounting, costs of goods sold also includes both amortization expense and, if applicable,
impairment charges associated with the fair value of the developed product rights for Auryxia as well as expense associated with the fair value inventory
step-up. The fair value of the developed product rights for Auryxia is being amortized over its estimated useful life, which as of December 31, 2022 is
estimated to be six years. The fair value inventory step-up as a result of the Merger was fully amortized as of the first quarter of 2021.

Research and Development Expenses

Research and development expenses consist primarily of costs incurred for the development of vadadustat, which include:

•

•

•

•

•

personnel-related expenses, including salaries, benefits, recruiting fees, travel and stock-based compensation expense of our research and
development personnel;

expenses incurred under agreements with CROs and investigative sites that conduct our clinical trials;

the cost of acquiring, developing and manufacturing clinical study materials through CMOs;

facilities, depreciation and other expenses, which include direct and allocated expenses for rent and maintenance of facilities, insurance
and other supplies;

costs associated with preclinical, clinical and regulatory activities; and

106

•

costs associated with pre-launch inventory build for vadadustat in the United States and Europe, for which we received the CRL from the
FDA in the United States in March 2022.

Research and development costs are expensed as incurred. Costs for certain development activities are recognized based on an evaluation of the progress to
completion of specific tasks using information and data provided to us by our vendors and our clinical sites.

We cannot determine with certainty the duration and completion costs of current or future clinical trials of Auryxia and vadadustat or if, when, or to what
extent we will receive marketing approval for vadadustat or generate revenue from the commercialization and sale of vadadustat, if approved. We may
never succeed in achieving marketing approval for vadadustat.

The duration, costs and timing of clinical trials and development of Auryxia and vadadustat will depend on a variety of factors including, but not limited to,
those described in Part I, Item 1A. Risk Factors. A change in the outcome of any of these variables with respect to the development of Auryxia and
vadadustat could mean a significant change in the costs and timing associated with that development. For example, if the FDA, the EMA, or other
regulatory authorities were to require us to conduct clinical trials in addition to or different from those that we currently anticipate, or if we experience
delays in any of our clinical trials, we could be required to expend significant additional financial resources and time on the completion of clinical
development.

From inception through December 31, 2022, we have incurred $1.6 billion in research and development expenses. We expect to have significant research
and development expenditures for the foreseeable future as we continue the development of Auryxia, vadadustat and any other product or product
candidate, including those that may be in-licensed or acquired.

Our direct research and development expenses consist principally of external costs, such as fees paid to clinical trial sites, consultants, central laboratories
and CROs in connection with our clinical trials, and drug substance and drug product manufacturing for clinical trials.

In 2020, we completed our global Phase 3 clinical program for vadadustat to which the majority of our research and development costs are attributable. A
significant portion of our research and development costs have been external costs, which we track on a program-by-program basis. These external costs
include fees paid to investigators, consultants, central laboratories and CROs in connection with our clinical trials, and costs related to acquiring and
manufacturing clinical trial materials. Our internal research and development costs are primarily personnel-related costs, depreciation and other indirect
costs. We do not track our internal research and development expenses on a program-by-program basis as they are deployed across multiple projects under
development.

The following table summarizes our external research and development expenses by program, as well as expenses not allocated to programs, for the years
ended December 31, 2022 and 2021:

Vadadustat external costs
External costs for other programs

Total external research and development expenses

Headcount, consulting, facilities and other

Total research and development expenses

Selling, General and Administrative Expenses

Year ended December 31,

2022

2021

(in thousands)

58,107  $
21,228 
79,335 

49,779 
129,114  $

48,506 
25,907 
74,413 

73,439 
147,852 

$

$

Selling, general and administrative expenses consist primarily of salaries and related costs for personnel, including stock-based compensation and travel
expenses for our commercial personnel, including our field sales force and other commercial support personnel, as well as personnel in executive and other
administrative or non-research and development functions. Other selling, general and administrative expenses include facility-related costs, fees for
directors, accounting and legal services fees, recruiting fees and expenses associated with obtaining and maintaining patents.

Results of Operations

107

 
 
Comparison of the Years Ended December 31, 2022 and 2021

Revenues:

Product revenue, net
License, collaboration and other revenue

Total revenues

Cost of goods sold:

Product
Amortization of intangibles
Total cost of goods sold

Operating expenses:

Research and development
Selling, general and administrative
License expense
Restructuring

Total operating expenses

Operating loss
Other expense, net
Loss on extinguishment of debt
Net loss before income taxes

Benefit from income taxes

Net loss

Year ended December 31,

2022

2021

Increase (Decrease)

(In Thousands)

177,067  $
115,535 
292,602 

142,216  $
71,362 
213,578 

48,754 
36,042 
84,796 

129,114 
138,699 
3,175 
15,933 
286,921 
(79,115)
(12,541)
(906)
(92,562)
— 
(92,562) $

117,352 
36,042 
153,394 

147,852 
174,161 
3,489 
— 
325,502 
(265,318)
(17,522)
— 
(282,840)
— 

(282,840) $

34,851 
44,173 
79,024 

(68,598)
— 
(68,598)

(18,738)
(35,462)
(314)
15,933 
(38,581)
186,203 
4,981 
(906)
190,278 
— 
190,278 

$

$

Product Revenue, Net. Net product revenue is derived from sales of our only commercial product in the United States, Auryxia. We distribute our product
principally through a limited number of wholesale distributors as well as certain specialty pharmacy providers. Net product revenue was $177.1 million for
the year ended December 31, 2022, compared to net product revenue of $142.2 million for the year ended December 31, 2021. The increase was primarily
due to pricing, improved payor mix, and a 2022 year-end inventory build by a customer that exceeded 2021, partially offset by a decline in volume during
2022.

License, Collaboration and Other Revenue. License, collaboration and other revenue was $115.5 million for the year ended December 31, 2022, compared
to $71.4 million for the year ended December 31, 2021. On June 30, 2022, we and Otsuka entered into the Termination Agreement, which, among other
things, terminated the cost sharing arrangement under the Otsuka collaboration agreement for the United States, or the Otsuka U.S. Agreement and the
Otsuka collaboration agreement for certain territories outside of the United States, or the Otsuka International Agreement. During the year ended
December 31, 2022, we recognized $55.0 million in collaboration revenue related to a payment received pursuant to the terms of the Termination
Agreement with Otsuka, $15.5 million related to previously deferred revenue as of the date of termination and $9.6 million of non-cash consideration
related to Otsuka's obligations to complete certain agreed upon clinical activities related to the Phase 3b clinical trial of vadadustat Otsuka is conducting, in
accordance with the current study protocol, at its own cost and expense. We also recognized $19.1 million in collaboration revenue for the year ended
December 31, 2022 from the Otsuka U.S. Agreement and the Otsuka International Agreement prior to the termination. We also recognized royalty revenue
under the MTPC Agreement, and revenue under our supply agreement with MTPC, or the MTPC Supply Agreement, totaling $18.0 million. On December
16, 2022, we, MTPC, and Esteve Química, S.A., or Esteve, executed an Assignment of Supply Agreement, or the Assignment Agreement, pursuant to
which the supply agreement between us and Esteve, or the Esteve Agreement, was assigned to MTPC. The Assignment Agreement transferred the rights
and obligations of the Esteve Agreement to MTPC, including the obligations under certain purchase orders issued by us and accepted by Esteve. Therefore,
we expect significantly less revenue in the future under the MTPC Supply Agreement. We recognized $65.5 million in collaboration revenue for the year
ended December 31, 2021 from the Otsuka U.S. Agreement and the Otsuka International Agreement, royalty revenue earned under the MTPC Agreement,
and revenue under our Supply Agreement with MTPC.

Cost of Goods Sold - Product. Cost of goods sold of $48.8 million for the year ended December 31, 2022 primarily consisted of costs associated with the
manufacturing of Auryxia and supply of Vafseo to MTPC for commercial sale in Japan, $28.7 million

108

 
 
in termination fees in connection with the BioVectra Termination Agreement in the fourth quarter of 2022, and $30.2 million primarily related to inventory
reserves associated with drug substance that will not be forward processed into drug product. These costs were offset by a non-cash reduction of our excess
purchase commitment liability of $67.6 million driven by the reduction in purchase commitments due to execution of the Termination Agreement with
BioVectra. See Note 15 to our consolidated financial statements in Part II, Item 8. Financial Statements and Supplementary Data of this Annual Report on
Form 10-K for further details of the BioVectra termination fees and decrease to the liability for excess purchase commitments.

Cost of goods sold of $117.4 million for the year ended December 31, 2021 primarily consisted of costs associated with the manufacturing of Auryxia and
supply of Vafseo to MTPC for commercial sale in Japan, $33.4 million in non-cash charges related to our excess purchase commitment liability,
$21.6 million in non-cash charges related to the fair-value inventory step-up from the application of purchase accounting, and $15.6 million primarily
related to excess and obsolescence reserves associated with Auryxia as well as inventory reserves associated with a previously disclosed manufacturing
quality issue related to Auryxia.

Cost of Goods Sold - Amortization of Intangibles. Amortization of intangibles relates to the acquired developed product rights for Auryxia, which is being
amortized using a straight-line method over its estimated useful life of approximately six years. Amortization of intangibles during each of the years ended
December 31, 2022 and 2021 was $36.0 million.

Research and Development Expenses. Research and development expenses were $129.1 million for the year ended December 31, 2022, compared to
$147.9 million for the year ended December 31, 2021. The net decrease of $18.7 million was due to the following changes as compared to the year ended
December 31, 2021:

Vadadustat external development expenses
Headcount, consulting, facilities and other

Total net decrease

(in millions)

9.6 
(28.3)
(18.7)

$

$

The decrease in research and development expense was primarily due to decreased headcount related costs as a result of the April 2022 reduction in force,
decreased consulting costs, and decreased outsourced contract services. Also during the year ended December 31, 2021, we made an upfront payment of
$3.0 million to Cyclerion for an exclusive global license to develop and commercialize praliciguat, an investigational oral sGC stimulator, which was
recorded to research and development expense which did not reoccur during the year ended December 31, 2022. Although we expect our research and
development expenses to continue to decrease in the near term, we will continue to incur significant research and development expenses in future periods in
support of ongoing or planned studies with respect to Auryxia and vadadustat and development of other product candidates.

Selling, General and Administrative Expenses. Selling, general and administrative expenses were $138.7 million for the year ended December 31, 2022,
compared to $174.2 million for the year ended December 31, 2021. The decrease of $35.5 million was primarily due to decreased headcount related costs
as a result of both the April 2022 and November 2022 reductions in force, decreased one-time legal costs, and lower marketing expenses following receipt
of the CRL for vadadustat. We expect our selling, general and administrative expenses to continue to decrease as we reduce our expense profile.

License Expenses. License expense related to royalties due to Panion relating to sales of Riona in Japan were $3.2 million and $3.5 million for the years
ended December 31, 2022 and 2021, respectively.

Restructuring. Restructuring expenses were $15.9 million for the year ended December 31, 2022 due to one-time termination benefits and contractual
termination benefits for severance, healthcare, and non-cash stock-based compensation related to the April 2022 and November 2022 reductions in force.
There were no restructuring expenses for the year ended December 31, 2021.

Other Expense, Net. Other expense, net, was $12.5 million for the year ended December 31, 2022, compared to $17.5 million for the year ended
December 31, 2021. The decrease was primarily due to a decrease in interest expense as a result of principal prepayments totaling $25.0 million made on
the Term Loans pursuant to the Second Amendment and Waiver in the year ended December 31, 2022, as well as an additional $8.0 million of quarterly
principal payments made on the Term Loans pursuant to the Loan Agreement with Pharmakon, reducing our outstanding balance on the Term Loans. The
decrease was also related to a decrease in the fair value of our derivative liability related to the Loan Agreement with Pharmakon during the year ended
December 31, 2022.

109

 
Loss on Extinguishment of Debt. During the year ended December 31, 2022, we recorded a debt extinguishment loss of $0.9 million related to the principal
prepayments made on the Term Loans pursuant to the Second Amendment and Waiver.

Comparison of the Years Ended December 31, 2021 and 2020

For discussion of our 2021 results and a comparison with 2020 results please refer to Part II, Item 7, "Management's Discussion and Analysis of Financial
Conditions and Results of Operations" in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021 that was filed with the SEC on
March 1, 2022, or the 2021 Form 10-K.

Liquidity and Capital Resources

We have funded our operations principally through sales of our common stock, payments received from our collaboration partners, product sales, debt, a
royalty transaction, and a refund liability to a customer. As of December 31, 2022, we had cash and cash equivalents of approximately $90.5 million. Cash
in excess of immediate requirements is invested in accordance with our investment policy, primarily with a view to liquidity and capital preservation. On
, or the Sales Agreement, with Jefferies LLC, or Jefferies, as agent, for the offer and sale
April 7, 2022, we entered into an Open Market Sale Agreement
of common stock at current market prices in amounts to be determined from time to time. Also, on April 7, 2022, we filed a prospectus supplement relating
to the Sales Agreement, pursuant to which we are able to offer and sell under the Sales Agreement up to $26.0 million of our common stock at current
market prices from time to time. From the date of filing of the prospectus supplement through the date of the filing of this Annual Report on Form 10-K,
we have not sold any shares of our common stock under this program. As of December 31, 2022, through our collaboration agreements with Otsuka and
MTPC we received approximately $837.1 million in cost-share funding, and are not entitled to receive any additional cost-share funding.

SM

Cash Flows

The following table sets forth the primary sources and uses of cash for each of the periods set forth below:

Net cash provided by (used in):

Operating activities
Investing activities
Financing activities

Net (decrease) increase in cash, cash equivalents and restricted cash

2022

Year ended December 31,

2021

(In Thousands)

2020

$

$

(73,154)
(114)
14,598 
(58,670)

$

$

(252,965) $
39,941 
133,731 
(79,293) $

(110,388)
(40,004)
231,720 
81,328 

Operating Activities. Net cash used in operating activities during the year ended December 31, 2022 was $73.2 million as compared to $253.0 million for
the year ended December 31, 2021. The decrease in cash used was primarily due to a lower net loss driven by increased revenue as well as decreased
operating expenses. The decrease in cash used was also due to lower accounts receivable and decreased inventory purchases. This was partially offset by
payments made related to the reductions in force as well as decreases in accounts payable and accrued expenses.

Net cash used in operating activities during the year ended December 31, 2021 of $253.0 million was largely driven by net payroll-related expenses, rebate
payments and payments for inventory.

Investing Activities. Net cash used in investing activities during the year ended December 31, 2022 of $0.1 million was comprised of purchases of
equipment.

Net cash provided by investing activities during the year ended December 31, 2021 of $39.9 million was comprised of proceeds from the maturities of
available for sale securities of $40.0 million, partially offset by immaterial purchases of equipment.

Financing Activities. Net cash provided by financing activities for the year ended December 31, 2022 was $14.6 million and consisted of net proceeds from
a refund liability to a customer of $40.0 million, net proceeds from the issuance of common stock of $7.1 million, and proceeds from the sale of stock
under our employee stock purchase plan, partially offset by principal payments of debt of $33.0 million.

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Net cash provided by financing activities for the year ended December 31, 2021 was $133.7 million and consisted of net proceeds from the sale of future
royalties of $44.8 million, net proceeds from the public issuance of common stock in connection with our prior ATM sales agreement of $88.2 million, and
proceeds from the exercise of stock options and from the sale of stock under our employee stock purchase plan.

A discussion of changes in our cash flow from the year ended December 31, 2020 to the year ended December 31, 2021 can be found in Part II, Item 7,
"Management's Discussion and Analysis of Financial Conditions and Results of Operations" of the 2021 Form 10-K.

Operating Capital Requirements

We have one product, Auryxia, approved for commercial sale in the United States. While we expect to be able to generate positive cash flows from our
existing operations, we have not generated, and may not generate, enough product revenue from the sale of Auryxia to realize net profits from product
sales. We currently have exclusive rights under a series of patents and patent applications to commercialize Auryxia in the U.S. that currently protect us
from generic drug competition until March 2025. Following loss of exclusivity in the U.S., we may not be able realize enough product revenue from sales
of Auryxia to realize net profits from product sales after March 2025. We have incurred losses and cumulative negative cash flows from operations in each
year since our inception in February 2007, and as of December 31, 2022, we had an accumulated deficit of $1.6 billion. Our current operating plan
anticipates continued increasing levels of cash flows from operations. We expect to continue to incur additional research and development expenses related
to our pipeline, additional costs related to vadadustat, and research and development and selling, general and administrative expenses for our ongoing
development and commercialization of Auryxia.

We expect our cash resources to fund our current operating plan for at least twelve months from the date of this filing. Our operating plan includes the
effects of certain cost avoidance measures and the reduction of overhead costs that resulted from the amendment or termination of contractual arrangements
with certain supply and collaboration partners and the reduction of operating expenses. During 2022, we implemented certain cost avoidance measures. For
example, during the fourth quarter of 2022, we and BioVectra entered into a Termination Agreement, pursuant to which the parties agreed, among other
things, to terminate, effective immediately, any and all existing agreements entered into between the parties in connection with the manufacture and supply,
by BioVectra to us, of Auryxia drug substance, which eliminated future contractual commitments with this supply partner. We, MTPC, and Esteve also
executed an Assignment Agreement, pursuant to which the Supply Agreement between us and Esteve was assigned to MTPC. The Assignment Agreement
transferred our rights and obligations under the Supply Agreement to MTPC, specifically including the obligations under certain purchase orders issued by
us and accepted by Esteve. In addition, in April, May and November of 2022, the Board of Directors approved reductions of our workforce by a combined
total of approximately 56% consisting of individuals across our company. These actions reflect our determination to refocus our strategic priorities and
drive revenue around our commercial product, Auryxia®, and our development portfolio, and are steps in a cost savings plan to significantly reduce our
expense profile in line with being a single commercial product company (see Note 5 to our consolidated financial statements in Part II, Item 8. Financial
Statements and Supplementary Data of this Annual Report on Form 10-K). We expect to finance future cash needs through product revenue, potential
strategic transactions, public or private equity or debt transactions, expense management, or a combination of these approaches. We plan to reduce our need
for future financing through product sales, expense management, and cost avoidance measures in line with being a single commercial product company.

We believe that the execution of further cost avoidance measures, future decisions by the FDA or foreign regulatory agencies related to the potential
regulatory approval of vadadustat, and our ability to generate additional value from vadadustat, if approved, through partnerships or other strategic
transactions could potentially further extend our cash runway for a period greater than twelve months. However, these future decisions and transactions are
not contemplated in our operating plan and are outside of our control. Additionally, with Loss of Exclusivity, or LOE, in March of 2025, we believe the
CMS decision to include phosphate binders in the dialysis bundle could potentially lead to higher sales of Auryxia after the LOE date than in other LOE
scenarios, and plan to work with payors and providers to continue the use of Auryxia beyond LOE. Assuming we are successful in those endeavors, we will
require additional funding to fund our strategic growth beyond Auryxia or to pursue later stage development and commercial activities for our product
candidates and any additional product or product candidates, including those that may be in-licensed or acquired.

There can be no assurance that the current operating plan will be achieved in the time frame anticipated by us, or that our cash resources will fund our
operating plan for the period of time anticipated by us, or that additional funding will be available on terms acceptable to us, or at all. Our forecast of the
period of time through which our financial resources will be adequate to support our operations is a forward-looking statement and involves numerous risks
and uncertainties, and actual results could vary as a result of a number of factors, many of which are outside our control. We have based this estimate on
assumptions that may be substantially different than actual results, and we could utilize our available capital resources sooner than we currently expect. If
our operating performance deteriorates significantly from the levels achieved in 2022, it could have an effect on our liquidity and our ability to continue as
a going concern in the future. Our future funding requirements, both near- and long-term,

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will depend on many factors including, but not limited to, those described under Part I, Item 1A. Risk Factors under the heading "Risks Related to our
Financial Position, Need for Additional Capital and Growth Strategy."

Contractual Obligations and Commitments

Leases

We lease approximately 65,167 square feet of office and lab space in Cambridge, Massachusetts under a lease which was most recently amended in
November 2020, collectively the Cambridge Lease. Under the Third Amendment to the Cambridge Lease, or the Third Amendment, executed in July 2016,
total monthly lease payments under the initial base rent were approximately $242,000 and are subject to annual rent escalations. In addition to such annual
rent escalations, base rent payments for a portion of said premises commenced on January 1, 2017 in the monthly amount of approximately $22,000. The
Fourth Amendment to the Cambridge Lease, executed in May 2017, provided additional storage space to us and did not impact rent payments. In April
2018, we entered into a Fifth Amendment to the Cambridge Lease, or the Fifth Amendment, for an additional 19,805 square feet of office space on the 12th
floor. Monthly lease payments for the existing 45,362 square feet of office and lab space, under the Third Amendment, remain unchanged. The new space
leased by us was delivered in September 2018 and additional monthly lease payments of approximately $135,000 commenced in February 2019 and are
subject to annual rent escalations, which commenced in September 2019. In November 2020, we entered into a Sixth Amendment to the Cambridge Lease,
or the Sixth Amendment, to extend the term of the Cambridge Lease with respect to the lab space from November 30, 2021 to January 31, 2025. The Sixth
Amendment includes two months of free rent starting in December 2020 and additional monthly lease payments of approximately $48,000 which
commenced in December 2021, and is subject to annual rent escalations, which commenced in December 2022.

Additionally, as a result of the Merger, we have a lease for 27,300 square feet of office space in Boston, Massachusetts, or the Boston Lease. The total
monthly lease payments under the Boston Lease are approximately $136,000 and are subject to annual rent escalations. On February 24, 2022, we entered
into a First Amendment to Lease, or the First Lease Amendment, with CLPF One Marina Park Drive LLC (successor-in-interest to Fallon Cornerstone One
MPD LLC), or the Landlord, amending the Boston Lease. Pursuant to the First Lease Amendment, we agreed to extend the term of the Boston Lease until
July 31, 2031. The monthly lease payment pursuant to the First Amendment will be $200,122 commencing on August 1, 2023 and subject to annual rent
escalation of approximately 2% commencing on August 1, 2024. The First Lease Amendment also includes a Landlord’s allowance for certain leasehold
improvements to the Premises in an amount of up to $1,954,680, provided that such allowance must be used prior to August 1, 2024.

In September 2019, Keryx entered into an agreement to sublease the Boston office space to Foundation Medicine, Inc., or Foundation. The sublease is
subject and subordinate to the Boston Lease between Keryx and the landlord. The term of the sublease commenced on October 16, 2019, upon receipt of
the required consent from the landlord for the sublease agreement, and expired on February 27, 2023. Keryx continues to be obligated for all payment
terms pursuant to the Boston Lease, and we will guaranty Keryx’s obligations under the sublease.

Term Loans

On November 11, 2019, Akebia, with Keryx as guarantor, entered into a loan agreement, or the Loan Agreement, with BioPharma Credit PLC as collateral
agent and a lender, or the Collateral Agent, and BioPharma Credit Investments V (Master) LP as a lender, pursuant to which term loans in an aggregate
principal amount of $100.0 million were made available to us in two tranches, subject to certain terms and conditions, or the Term Loans. BioPharma
Credit PLC subsequently transferred its interest in the Term Loans, solely in its capacity as a lender, to its affiliate, BPCR Limited Partnership. The
Collateral Agent and the lenders are collectively referred to as Pharmakon. The first tranche of $80.0 million, or Tranche A, was drawn on November 25,
2019, or the Tranche A Funding Date, and the second tranche of $20.0 million, or Tranche B, was drawn on December 10, 2020, or the Tranche B Funding
Date. During the twelve months ended December 31, 2022, we made our first quarterly principal payment under the Term Loans of $8.0 million. In
addition, on July 15, 2022, pursuant to the Loan Agreement, as amended, we made prepayments totaling $25.0 million together with a prepayment
premium of $0.5 million plus all accrued and unpaid interest on such prepayments of principal to the Effective Date, and Pharmakon agreed to waive or
modify certain covenants in the Loan Agreement. A more detailed description of the Term Loans can be found in Note 11 to our consolidated financial
statements in Part II, Item 8. Financial Statements and Supplementary Data of this Annual Report on Form 10-K.

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Liability Related to Sale of Future Royalties

On February 25, 2021, we entered into a royalty interest acquisition agreement, or the Royalty Agreement, with HCR, pursuant to which we sold to HCR
our right to receive royalties and sales milestones for vadadustat in the MTPC Territory, such payments collectively the Royalty Interest Payments, in each
case, payable to us under the MTPC Agreement, subject to an annual maximum “cap” of $13.0 million, or the Annual Cap, and an aggregate maximum
“cap” of $150.0 million, or the Aggregate Cap. After HCR receives Royalty Interest Payments equal to the Annual Cap in a given calendar year, we will
receive 85% of the Royalty Interest Payments for the remainder of that year. After HCR receives Royalty Interest Payments equal to the Aggregate Cap, or
we pay the Aggregate Cap to HCR (net of the Royalty Interest Payments already received by HCR), the Royalty Interest Payments will revert back to us,
and HCR would have no further right to any Royalty Interest Payments. We received $44.8 million from HCR (net of certain transaction expenses) under
the Royalty Agreement, and we are eligible to receive an additional $5.0 million in 2023 under the Royalty Agreement if specified annual sales milestones
are achieved for vadadustat in the MTPC Territory, subject to the satisfaction of certain customary conditions. We retain the right to receive all potential
future regulatory milestones for vadadustat under the MTPC Agreement. A more detailed description of the Royalty Agreement can be found in Note 6 to
our consolidated financial statements in Part II, Item 8. Financial Statements and Supplementary Data of this Annual Report on Form 10-K.

Refund Liability to Customer

On February 18, 2022, pursuant to the Vifor Second Amended Agreement, CSL Vifor contributed $40.0 million to the Working Capital Fund, established
to partially fund our costs of purchasing vadadustat from our contract manufacturers, which amount of funding will fluctuate, and which funding we are
required to repay to CSL Vifor over time. The $40.0 million initial contribution to the Working Capital Fund represented 50% of the amount of purchase
orders that we had placed with our contract manufacturers for the supply of vadadustat for the United States, or the Territory, already delivered as of the
effective date of the Vifor Second Amended Agreement, and to be delivered through the end of 2023.

We have recorded the Working Capital Fund as a refund liability under ASC 606, Revenue from Contracts with Customers. We accounted for the refund
liability as a debt arrangement with zero coupon interest. We imputed interest on the refund liability to the customer at a rate of 15.0% per annum and
recorded an initial discount on the refund liability to the customer and a related deferred gain as of the date the funds were received from CSL Vifor, which
was March 18, 2022. The discount on the note payable is being amortized to interest expense using the effective interest method over the expected term of
the refund liability. The deferred gain is being amortized to interest income on a straight-line basis over the expected term of the refund liability. A more
detailed description of the Working Capital Fund can be found in Note 4 to our consolidated financial statements in Part II, Item 8. Financial Statements
and Supplementary Data of this Annual Report on Form 10-K.

Manufacturing Agreements

As a result of the Merger, our contractual obligations include Keryx’s commercial supply agreement with Siegfried Evionnaz SA, or Siegfried, and
previously included a commercial supply agreement with BioVectra Inc., or BioVectra, to supply commercial drug substance for Auryxia.

On December 22, 2022, we entered into a Termination Agreement with BioVectra, pursuant to which we and BioVectra agreed, among other things, to
terminate, effective immediately, any and all existing agreements entered into between us in connection with the manufacture and supply, by BioVectra to
us, of Auryxia drug substance. Under the terms of the BioVectra Termination Agreement, we agreed to pay BioVectra a total of $32.5 million consisting of
(i) an upfront payment of $17.5 million and (ii) six quarterly payments of $2.5 million commencing in April 2024. We made the initial payment of $17.5
million in December 2022. In addition, we and BioVectra have released one another from all existing and future claims and liabilities and agreed to return
certain materials and documents. Furthermore, as it relates to all open purchase orders, BioVectra is relieved from any obligations to manufacture any
product or perform services under any such open purchase orders, and we are relieved from any obligations to purchase any product under such open
purchase orders. We are also relieved from any obligations to pay any outstanding purchase orders or invoices related to performance by BioVectra of
services and all other obligations under our agreements with BioVectra.

Pursuant to the Siegfried Master Manufacturing Services and Supply Agreement, as amended through December 31, 2022, or the Siegfried Agreement, we
have agreed to purchase a minimum quantity of drug substance of Auryxia at predetermined prices. The term of the Siegfried Agreement was to expire on
December 31, 2022, but was automatically extended into 2023 as a result of Siegfried's updated production schedule for delivery of product originally
scheduled for delivery in 2022. The Siegfried Agreement provides us and Siegfried with certain termination rights. As of December 31, 2022, we are
required to purchase a minimum quantity of drug substance under the Siegfried Agreement for Auryxia annually at a total cost of approximately $8.4
million through the third quarter of 2023. As of the date of the filing of this Annual Report on Form 10-K, we have amended the Siegfried Agreement
pursuant to which, we agreed to extend the term and purchase a minimum quantity of drug substance of Auryxia at a predetermined price as further
described in Note 17 to our consolidated financial statements in Part II, Item 8. Financial Statements and Supplementary Data of this Annual Report on
Form 10-K.

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On April 9, 2019, we entered into a Supply Agreement with Esteve Química, S.A., or Esteve, or the Esteve Agreement. The Esteve Agreement included the
terms and conditions under which Esteve would manufacture vadadustat drug substance for commercial use. On December 16, 2022, we, MTPC, and
Esteve executed an assignment agreement, or the Assignment Agreement, pursuant to which the Esteve Agreement was assigned to MTPC. The
Assignment Agreement transferred our rights and obligations under the Esteve Agreement to MTPC, including the obligations under certain purchase
orders issued by us and accepted by Esteve. We will have no further obligation to take delivery of, or pay for, product delivered by Esteve under the Esteve
Agreement or the transferred purchase orders.

On March 11, 2020, we entered into a Supply Agreement with Patheon Inc., or Patheon, or the Patheon Agreement. The Patheon Agreement includes the
terms and conditions under which Patheon will manufacture vadadustat drug product for commercial use. Pursuant to the Patheon Agreement, we provide
Patheon a long-term forecast on an annual basis, as well as short-term forecasts on a quarterly basis, or the Patheon Forecast. The Patheon Forecast reflects
our needs for commercial supply of vadadustat drug product produced by Patheon, represented as a quantity of drug product per calendar quarter. The
parties have agreed to a volume-based pricing structure under the Patheon Agreement. The Patheon Agreement had an initial term beginning March 11,
2020 and ending June 30, 2023 and automatically renews for successive one-year terms unless either party gives the other party eighteen months' prior
written notice. The current term of the Patheon Agreement ends June 30, 2025. Pursuant to the Patheon Agreement, we have agreed to purchase a certain
percentage of the global demand for vadadustat drug product from Patheon. As of December 31, 2022, we had a minimum commitment with Patheon for
$3.1 million through the third quarter of 2023.

On April 2, 2020, we entered into a Supply Agreement with STA Pharmaceutical Hong Kong Limited, a subsidiary of WuXi AppTec, or WuXi STA, as
amended on April 15, 2021, or the WuXi STA DS Agreement. The WuXi STA DS Agreement includes the terms and conditions under which WuXi STA
will manufacture vadadustat drug substance for commercial use. Pursuant to the WuXi STA DS Agreement, we provide rolling forecasts to WuXi STA on a
quarterly basis, or the WuXi STA DS Forecast. The WuXi STA DS Forecast reflects our needs for vadadustat drug substance produced by WuXi STA over
a certain number of quarters. The parties have agreed to a volume-based pricing structure under the WuXi STA DS Agreement. The WuXi STA DS
Agreement has an initial term of four years, beginning April 2, 2020 and ending April 2, 2024. Pursuant to the WuXi STA DS Agreement, we have agreed
to purchase a certain percentage of the global demand for vadadustat drug substance from WuXi STA. As of December 31, 2022, we have committed to
purchase $15.3 million of vadadustat drug substance from WuXi STA through the end of 2023.

On February 10, 2021, we entered into a Supply Agreement with WuXi STA, or the WuXi STA DP Agreement. The WuXi STA DP Agreement includes
the terms and conditions under which WuXi STA will manufacture and supply vadadustat drug product for commercial purposes. Pursuant to the WuXi
STA DP Agreement, we will provide rolling forecasts to WuXi STA on a quarterly basis, or the WuXi STA DP Forecast. Each WuXi STA DP Forecast will
reflect the quantities of vadadustat drug product that we expect to order from WuXi STA over a certain number of months, represented as a quantity of
vadadustat drug product per calendar quarter. Pursuant to the WuXi STA DP Agreement, we have agreed to purchase a certain percentage of global demand
for vadadustat drug product from WuXi STA. The parties have agreed to a volume-based pricing structure under the WuXi STA DP Agreement. The
vadadustat drug product price will remain fixed for the first 12 months and thereafter shall be annually reviewed by us and WuXi STA. We will also
reimburse WuXi STA for certain reasonable expenses. The WuXi STA DP Agreement has an initial term of four years, beginning February 10, 2021 and
ending February 10, 2025. The WuXi STA DP Agreement may be renewed or extended by mutual agreement of us and WuXi STA with at least 18 months’
prior written notice. The WuXi STA DP Agreement allows us to terminate the relationship on 180 calendar days’ prior written notice to WuXi STA for any
reason. In addition, each party has the ability to terminate the WuXi STA DP Agreement upon the occurrence of certain conditions.

Other Third Party Contracts

We contract with various organizations to conduct research and development activities with remaining contract costs to us of approximately $90.2 million
as of December 31, 2022. The scope of the services under these research and development contracts can be modified and the contracts cancelled by us upon
written notice, and therefore not included in the table of contractual obligations and commitments. In some instances, the contracts may be cancelled by the
third party upon written notice.

Critical Accounting Policies and Significant Judgments and Estimates

Our management’s discussion and analysis of our financial condition and results of operations are based on our consolidated financial statements, which
have been prepared in accordance with U.S. generally accepted accounting principles. The preparation of these consolidated financial statements requires
us to make estimates and judgments that affect the reported

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amounts of assets, liabilities, and expenses and the disclosure of contingent assets and liabilities in our consolidated financial statements. On an ongoing
basis, we evaluate our estimates and judgments, including those related to revenue, inventory, our excess purchase commitment liability, liabilities related
to sale of future royalties, refund liabilities to customers, impairment of intangible assets, and income taxes. We base our estimates on historical experience,
known trends and events, and various other factors that are believed to be reasonable under the circumstances, the results of which form the basis for
making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these
estimates under different assumptions or conditions. In making estimates and judgments, management employs critical accounting policies.

While our significant accounting policies are described in more detail in the notes to our consolidated financial statements appearing elsewhere in this
Annual Report on Form 10-K, we believe the following accounting policies to be most critical to the judgments and estimates used in the preparation of our
consolidated financial statements.

Product Revenue, Net

We sell Auryxia in the United States, primarily to wholesale distributors as well as certain specialty pharmacy providers, collectively, Customers. These
Customers resell our product to health care providers and patients. In addition to distribution agreements with Customers, we enter into arrangements with
health care providers and payors that provide for government-mandated and/or privately-negotiated rebates, chargebacks, and discounts with respect to the
purchase of our product.

We recognize revenue on product sales when the Customer obtains control of our product, which occurs at a point in time, typically upon delivery to the
Customer. We expense incremental costs of obtaining a contract as and when incurred if the expected amortization period of the asset that we would have
recognized is one year or less.

Revenue from product sales is recorded at the net sales price (transaction price), which includes estimates of variable consideration for which reserves are
established and are based on various incentives that are offered within contracts between us and our Customers, health care providers, payors and other
indirect customers relating to sales of our products. These reserves are based on the amounts earned or to be claimed on the related sales. These reserves
include:

•

•

•

•

Trade Discounts and Allowances: Discounts that include incentive fees that are explicitly stated in our contracts. In addition, we compensate
(through trade discounts and allowances) our Customers for sales order management, data, and distribution services.
Product Returns: Consistent with industry practice, we generally offer Customers a limited right of return which allows for the product to be
returned when the product expiry is within an allowable window, when the quantity delivered is different than quantity ordered, the product is
damaged in transit prior to receipt by the customer, or is subject to a recall. This right of return generally lapses once the product is provided to a
patient. We estimate the amount of our product sales that may be returned for credit by our Customers. We currently estimate product return
reserve using available industry data and our own historical sales information, including our visibility into the inventory remaining in the
distribution channel.
Provider Chargebacks and Discounts: Chargebacks for fees and discounts to providers represent the estimated obligations resulting from
contractual commitments to sell products to qualified healthcare providers at prices lower than the list prices charged to Customers who directly
purchase the product from us. Customers charge us for the difference between what they pay for the product and the ultimate selling price to the
qualified healthcare providers. Reserves for chargebacks consist of credits that we expect to issue for units that remain in the distribution channel
at each reporting period end that we expect will be sold to qualified healthcare providers, and chargebacks that Customers have claimed but for
which we have not yet issued a credit.
Commercial and Medicare Part D Rebates: We contract with various commercial payor organizations, primarily health insurance companies and
pharmacy benefit managers, for the payment of rebates with respect to utilization of our products. We estimate the rebates for commercial and
Medicare Part D payors based upon (i) our contracts with the payors and (ii) information obtained from our Customers and other third parties
regarding the payor mix for Auryxia.

• Other Government Rebates: We are subject to discount obligations under state Medicaid programs and other government programs. We estimate
Medicaid and other government programs rebates based upon a range of possible outcomes that are probability-weighted for the estimated payor
mix. For Medicare, we also estimate the number of patients in the prescription drug coverage gap for whom we will owe an additional liability
under the Medicare Part D program. Our liability for these rebates consists of invoices received for claims from prior quarters that have not been
paid or for which an invoice has not yet been received, estimates of claims for the current quarter, and estimated future claims that will be made
for product that has been recognized as revenue, but which remains in the distribution channel at the end of each reporting period.

• Other Incentives: Other incentives that we offer include voluntary patient assistance programs such as our co-pay assistance program, which are
intended to provide financial assistance to qualified commercially insured patients with prescription drug co-payments required by payors. The
calculation of the accrual for co-pay assistance is based on actual claims processed during a given period, as well as historical utilization data to
estimate the amount we expect to receive associated with product that has been recognized as revenue, but remains in in the distribution channel at
the end of each reporting period.

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When appropriate, these estimates take into consideration a range of possible outcomes which are probability-weighted in accordance with the expected
value method in ASC 606 for relevant factors such as our historical experience, current contractual and statutory requirements, specific known market
events and trends, industry data, and forecasted customer buying and payment patterns. Overall, these reserves reflect our best estimates of the amount of
consideration to which we are entitled based on the terms of the respective underlying contracts.

The preceding estimates and judgments materially affect our recognition of net product revenues. Changes in our estimates of net product revenues could
have a material effect on net product revenues recorded in the period in which we determine that change occurs.

Collaboration Revenues

We enter into out-license and collaboration agreements which are within the scope of ASC 606, under which we license certain rights to our product
candidates to third parties. The terms of these arrangements typically include payment to us of one or more of the following: non-refundable, up-front
license fees; development, regulatory, and commercial milestone payments; payments for manufacturing supply services we provide through our contract
manufacturers; and royalties on net sales of licensed products. Each of these payments may result in license, collaboration and other revenue, except for
revenues from royalties on net sales of licensed products, which are classified as royalty revenues.

For elements of our collaboration agreements that are accounted for pursuant to ASC 606, we must develop assumptions that require judgment to determine
whether the individual promises should be accounted for as separate performance obligations or as a combined performance obligation, and to determine
the stand-alone selling price for each performance obligation identified in the contract. We use key assumptions to determine the stand-alone selling price,
which may include forecasted revenues, development timelines, reimbursement rates for personnel costs, discount rates, and probabilities of technical and
regulatory success. If the license to our intellectual property is determined to be distinct from the other performance obligations identified in an out-license
and collaboration arrangement, we recognize revenue from non-refundable, up-front fees allocated to the license when the license is transferred to the
customer and the customer is able to use and benefit from the license. For licenses that are bundled with other promises, we utilize judgment to assess the
nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if
over time, the appropriate method of measuring progress for purposes of recognizing revenue from non-refundable, up-front fees. With regard to the
Otsuka collaboration agreements, we recognized revenue related to amounts allocated to the identified performance obligation on a proportional
performance basis as the underlying services are performed.

The preceding estimates and judgments materially affect our recognition of collaboration revenues. Changes in our estimates of forecasted development
costs could impact proportional performance percentages and could have a material effect on collaboration revenue recorded in the period in which we
determine that change occurs.

Refund Liability to Customer

We treat the refund liability to customer as a zero-coupon debt financing, which is recorded at net present value. We recorded an initial discount on the
refund liability to the customer and a corresponding deferred gain to the refund liability to customer on the consolidated balance sheet as of the date the
funds were received from CSL Vifor, which was March 18, 2022. The discount on the note payable is being amortized to interest expense using the
effective interest method over the expected term of the refund liability. The deferred gain is being amortized to interest income on a straight-line basis over
the expected term of the refund liability.

Inventory

We value our inventories at the lower-of-cost or net realizable value. We determine the cost of our inventories, which includes amounts related to materials
and manufacturing overhead, on a first-in, first-out basis. We classify inventory costs as long-term, in other assets in our consolidated balance sheets, when
we expect to utilize the inventory beyond our normal operating cycle.

We perform an assessment of the recoverability of capitalized inventory during each reporting period, and write down any excess and obsolete inventory to
our net realizable value in the period in which the impairment is first identified. Such impairment charges, should they occur, are recorded as a component
of cost of product sales in the consolidated statements of operations and comprehensive loss. The determination of whether inventory costs will be
realizable requires the use of estimates by management. If actual market conditions are less favorable than projected by management, additional write-
downs of inventory may be required. Additionally, our product is subject to strict quality control and monitoring that we perform throughout the
manufacturing process. In the event that certain batches or units of product do not meet quality specifications, we will record a charge to cost of product
sales, to write-down any unmarketable inventory to its estimated net realizable value. In all cases, product inventory is carried at the lower of cost or its
estimated net realizable value.

Excess Purchase Commitment Liability

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We identified executory contracts in the commercial supply agreements between Keryx and its contract manufacturers for Auryxia, which include future
firm purchase commitments. These executory contracts were deemed to have an off-market element related to the amount of purchase commitments that
exceed the current forecast and as such, we recorded a liability in purchase accounting. We re-evaluate the excess purchase commitments each reporting
period to assess whether any adjustments to the excess purchase commitment liability are necessary. This evaluation includes reviewing the contractual
minimums, expiration and utilization assumptions, and sales forecasts. Inventory receipts that have been previously identified as excess are recorded as a
reduction to the excess purchase commitment liability.

Liability Related to Sale of Future Royalties

We treat the liability related to sale of future royalties as a debt financing, amortized under the effective interest rate method over the estimated life of the
related expected royalty stream. The liability related to sale of future royalties and the debt amortization are based on our current estimates of future
royalties expected to be paid over the life of the arrangement. We will periodically assess the expected royalty payments. To the extent our estimates of
future royalty payments are greater or less than previous estimates or the estimated timing of such payments is materially different than previous estimates,
we will adjust the effective interest rate and recognize related non-cash interest expense on a prospective basis. Changes in our estimates of future royalty
payments could have a material effect on the liability related to sale of future royalties balance recorded in the period in which we determine that change
occurs.

Intangible Assets

We maintain a definite-lived intangible asset related to developed product rights for Auryxia, which was acquired on December 12, 2018 as part of the
Merger.

Intangible assets are initially recorded at fair value and stated net of accumulated amortization and impairments. We amortize our intangible assets that
have finite lives using either the straight-line method, or if reliably determinable, based on the pattern in which the economic benefit of the asset is
expected to be utilized. Amortization for our intangible asset is recorded over its remaining estimated useful life, which as of December 31, 2022 is
estimated to be six years.

We review intangible assets subject to amortization to determine if any adverse conditions exist or a change in circumstances has occurred that would
indicate impairment or a change in the remaining useful life. If an impairment indicator exists, we perform a recoverability test by comparing the sum of
the estimated undiscounted cash flows of the intangible asset group to its carrying value on the consolidated balance sheet. If the carrying value of the
intangible asset group exceeds the undiscounted cash flows used in the recoverability test, we will write the carrying value of the intangible asset group
down to the fair value in the period identified. We calculate the fair value of the intangible asset group as the present value of estimated future cash flows
expected to be generated from the intangible asset group using a risk-adjusted discount rate. In determining estimated future cash flows associated with the
intangible asset group, we use market participant assumptions pursuant to ASC Topic 820, Fair Value Measurements and Disclosures (ASC 820). During
the second quarter of 2020, we identified indicators of impairment related to the developed product rights for Auryxia and recorded an impairment charge
of $115.5 million (see Note 9 contained in this Annual Report on Form 10-K for additional information).

Income Taxes

Income taxes are recorded in accordance with FASB Topic 740, Income Taxes, or ASC 740, which provides for deferred taxes using an asset and liability
approach. We recognize deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial
statements or tax returns. Deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases of assets
and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Valuation allowances are provided, if, based
upon the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. All deferred taxes as of
December 31, 2022 and 2021 are classified as noncurrent within the income tax provision (see Note 13 to our consolidated financial statements in Part II,
Item 8. Financial Statements and Supplementary Data).

Recent Accounting Pronouncements

For additional discussion of recent accounting pronouncements, please refer to New Accounting Pronouncements – Recently Adopted and New Accounting
Pronouncements – Not Yet Adopted included within Note 2 to our consolidated financial statements in Part II, Item 8. Financial Statements and
Supplementary Data of this Annual Report on Form 10-K.

Item 7A. Quantitative and Qualitative Disclosures about Market Risk

We are exposed to market risk related to changes in interest rates. As of December 31, 2022 and 2021, we had cash and cash equivalents of $90.5 million
and $149.8 million, respectively, consisting primarily of money market mutual funds consisting of

117

certificates of deposit and corporate debt securities. Interest rate sensitivity is affected by changes in the general level of U.S. interest rates, particularly
because our investments are in short-term securities. Our investments are subject to interest rate risk and will fall in value if market interest rates increase.
Due to the short-term duration of our investment portfolio and the low risk profile of our investments, an immediate 100 basis point change in interest rates
would not have a material effect on the fair market value of our portfolio.

In  addition,  we  are  exposed  to  market  risk  related  to  exchange  rates.  A  substantial  portion  of  our  revenues  for  the  year  ended  December  31,  2022  was
 in
received in U.S. dollars, including revenues we receive from royalty payments converted to U.S. dollars based on the net sales of Riona  and Vafseo
Japanese yen. Our exchange rate risk arises from such foreign currency net sales. As a result, we are exposed to movements in the exchange rates of the
Japanese yen against the U.S. dollar.

TM,

(R)

For the royalty payments we received based on net sales of Riona and Vafseo in Japan during the year ended December 31, 2022, a 5.0% appreciation or
depreciation of the Japanese yen against the U.S. dollar would have increased or decreased, respectively, our revenues in the year ended December 31,
2022 by approximately $0.4 million.

We have generally accepted the exposure to exchange rate movements without using derivative financial instruments to manage this foreign currency risk.

118

Item 8. Financial Statements and Supplementary Data

Akebia Therapeutics, Inc.

Table of Contents

Report of Independent Registered Public Accounting Firm (PCAOB ID: 42)

Financial Statements

Consolidated Balance Sheets

Consolidated Statements of Operations and Comprehensive Loss

Consolidated Statements of Stockholders’ Equity

Consolidated Statements of Cash Flows

Notes to Consolidated Financial Statements

119

Page

120

122

123

124

125

126

 
 
 
Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Akebia Therapeutics, Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Akebia Therapeutics, Inc. (the Company) as of December 31, 2022, and 2021, the
related consolidated statements of operations and comprehensive loss, stockholders' equity and cash flows for each of the three years in the period ended
December 31, 2022, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial
statements present fairly, in all material respects, the financial position of the Company at December 31, 2022 and 2021, and the results of its operations
and its cash flows for each of the three years in the period ended December 31, 2022, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's
internal control over financial reporting as of December 31, 2022, based on criteria established in Internal Control-Integrated Framework issued by the
Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated March 10, 2023, expressed an unqualified
opinion thereon.

Basis for Opinion

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company’s financial
statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the
Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the
PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing
procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to
those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits
also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the
financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matters

The critical audit matter communicated below is a matter arising from the current period audit of the financial statements that was communicated or
required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the financial statements and (2)
involved our especially challenging, subjective or complex judgments. The communication of the critical audit matter does not alter in any way our opinion
on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion
on the critical audit matter or on the accounts or disclosures to which it relates.

120

Description of the
Matter

Revenue recognition - Payor Mix Impact on Measuring Variable Consideration, specifically payor rebates
As of December 31, 2022, the Company recorded accrued product revenue allowances of $29.0 million, which includes payor
rebates. As discussed in Note 2 to the Company’s consolidated financial statements, the Company recognizes revenue from
product sales at the net sales price (transaction price), which includes estimates of variable consideration for which reserves are
established. The Company contracts with various commercial payor organizations, primarily health insurance companies and
pharmacy benefit managers, for the payment of rebates with respect to utilization of its products. The Company estimates the
rebates for payors based upon (i) its contracts with the payors and (ii) information obtained from its customers and other third
parties regarding the payor mix. The Company estimates these payor rebates and records such estimates in the same period the
related revenue is recognized, resulting in a reduction of product revenue and the establishment of a current liability.

Auditing the measurement of the Company’s net product revenues was complex and judgmental due to the significant
estimation required in determining the amount of consideration that will be collected net of estimates for payor rebates. In
particular, the payor rebate is affected by assumptions in payor behavior such as changes in payor mix, payor collections and
current customer contractual requirements.

How We Addressed
the Matter in Our
Audit

We obtained an understanding, evaluated the design and tested the operating effectiveness of controls over the Company’s
revenue recognition process, including controls over the underlying assumptions and inputs used by management to estimate
the payor rebates. Specifically, this included controls to assess the completeness and accuracy of the current and historical data
used in calculating the estimate.

Our audit procedures to test the Company’s recognition of net product revenues and specifically the variable consideration
component of payor rebates included, among others, assessing the methodology used to determine the estimate and testing the
significant assumptions and the underlying data used by the Company in its analysis. This included testing the reasonableness
of management’s estimates to other inputs into their calculations such as contract terms, product in the distribution channel, and
actual invoices received. We assessed the historical accuracy of management’s estimates by comparing actual activity to
previous estimates and performed analytical procedures to evaluate the completeness of the payor rebate reserves.

/s/ Ernst & Young LLP

We have served as the Company’s auditor since 2013.

Boston, Massachusetts
March 10, 2023

121

 
 
 
 
AKEBIA THERAPEUTICS, INC.

Consolidated Balance Sheets

(in thousands, except share and per share data)

Assets
Current assets:

Cash and cash equivalents
Inventory
Accounts receivable, net
Prepaid expenses and other current assets

Total current assets

Property and equipment, net
Operating lease assets
Goodwill
Other intangible assets, net
Other assets

Total assets

Liabilities and stockholders' equity
Current liabilities:

Accounts payable
Accrued expenses and other current liabilities
Short-term deferred revenue
Current portion of long-term debt

Total current liabilities

Deferred revenue, net of current portion
Operating lease liabilities, net of current portion
Derivative liability
Long-term debt, net
Liability related to sale of future royalties, net
Refund liability to customer
Other non-current liabilities
Total liabilities

Commitments and contingencies (Note 15)
Stockholders' equity:

Preferred stock $0.00001 par value, 25,000,000 shares authorized at December 31, 2022 and 2021; 0 shares
issued and outstanding at December 31, 2022 and 2021
Common stock: $0.00001 par value; 350,000,000 shares authorized at December 31, 2022 and 2021,
respectively; 184,135,714 and 177,000,963 shares issued and outstanding at December 31, 2022 and 2021,
respectively

Additional paid-in capital
Accumulated other comprehensive gain
Accumulated deficit

Total stockholders' equity
Total liabilities and stockholders' equity

See accompanying notes to consolidated financial statements.

122

December 31, 2022

December 31, 2021

$

$

$

$

90,466  $
21,762 
39,180 
33,541 
184,949 
5,214 
29,158 
55,053 
72,084 
5,372 
351,830  $

18,021  $
70,997 
3,738 
32,000 
124,756 
43,296 
28,961 
760 
34,078 
57,484 
40,992 
12,161 
342,488 

149,800 
38,195 
50,875 
33,140 
272,010 
6,754 
33,852 
55,053 
108,127 
49,754 
525,550 

33,588 
104,456 
20,906 
97,543 
256,493 
21,474 
33,703 
1,820 
— 
53,079 
— 
82,525 
449,094 

— 

— 

2 
1,562,247 
6 
(1,552,913)
9,342 
351,830  $

1 
1,536,800 
6 
(1,460,351)
76,456 
525,550 

 
 
 
 
 
 
AKEBIA THERAPEUTICS, INC.

Consolidated Statements of Operations and Comprehensive Loss

(in thousands, except share and per share data)

Revenues:

Product revenue, net
License, collaboration and other revenue

Total revenues

Cost of goods sold:

Product
Amortization of intangibles
Impairment of intangible asset
Total cost of goods sold

Operating expenses:

Research and development
Selling, general and administrative
License expense
Restructuring

Total operating expenses

Operating loss
Other income (expense):

Interest income (expense)
Other income (expense)
Loss on extinguishment of debt

Net loss before income taxes

Benefit from income taxes

Net loss

Net loss per share - basic and diluted

Weighted-average number of common shares - basic and diluted

Comprehensive loss:

Net loss

Other comprehensive (loss) gain - unrealized (loss) gain on securities

Total comprehensive loss

Year Ended December 31,

2022

2021

2020

177,067  $
115,535 
292,602 

142,216  $
71,362 
213,578 

48,754 
36,042 
— 
84,796 

129,114 
138,699 
3,175 
15,933 
286,921 
(79,115)

(15,687)
3,146 
(906)
(92,562)
— 
(92,562) $

(0.51) $

117,352 
36,042 
— 
153,394 

147,852 
174,161 
3,489 
— 
325,502 
(265,318)

(19,936)
2,414 
— 
(282,840)
— 

(282,840) $

(1.70) $

128,901 
166,406 
295,307 

148,866 
31,515 
115,527 
295,908 

218,485 
153,947 
3,409 
— 
375,841 
(376,442)

(8,871)
1,856 
— 
(383,457)
— 
(383,457)

(2.77)

182,782,680 

165,949,695 

138,463,152 

(92,562) $
— 
(92,562) $

(282,840) $

(7)

(282,847) $

(383,457)
13 
(383,444)

$

$

$

$

$

See accompanying notes to consolidated financial statements.

123

 
 
 
 
 
 
 
Akebia Therapeutics, Inc.

Consolidated Statements of Stockholders’ Equity

(in thousands, except share and per share data)  

Common Stock

Number of
Shares

$0.00001
Par Value

Additional Paid-
In
 Capital

Unrealized
Gain/Loss

Accumulated
Deficit 

Total
Stockholders'
Equity

Balance at December 31, 2019
Issuance of common stock, net of issuance costs
Proceeds from sale of stock under employee stock purchase plan
Exercise of options
Share-based compensation expense
Restricted stock unit vesting
Unrealized gain
Net loss

Balance at December 31, 2020

Issuance of common stock, net of issuance costs
Proceeds from sale of stock under employee stock purchase plan
Share-based compensation expense
Restricted stock unit vesting
Unrealized loss
Net loss

121,674,568 $
24,133,348
235,658
166,633
—
1,863,878
—
—

148,074,085 $

26,352,343
307,193
—
2,267,342
—
—

1  $
— 
— 
— 
— 
— 
— 
— 

1  $

— 
— 
— 
— 
— 
— 

1,188,810  $
209,519 
1,100 
1,226 
24,460 
— 
— 
— 

1,425,115  $

88,204 
746 
22,735 
— 
— 
— 

—  $
— 
— 
— 
— 
— 
13 
— 

13  $

— 
— 
— 
— 
(7)
— 

(794,054) $

— 
— 
— 
— 
— 
— 
(383,457)

(1,177,511) $

— 
— 
— 
— 
— 
(282,840)

Balance at December 31, 2021

177,000,963 $

1  $

1,536,800  $

6  $

(1,460,351) $

Issuance of common stock, net of issuance costs
Proceeds from sale of stock under employee stock purchase plan
Share-based compensation expense
Restricted stock unit vesting
Exercise of options
Net loss

Balance at December 31, 2022

4,404,600
335,146
—
2,252,565
142,440
—

1 
— 
— 
— 
— 
— 

7,121 
410 
17,849 
— 
67 
— 

— 
— 
— 
— 
— 
— 

— 
— 
— 
— 
— 
(92,562)

184,135,714 $

2  $

1,562,247  $

6  $

(1,552,913) $

394,757 
209,519 
1,100 
1,226 
24,460 
— 
13 
(383,457)

247,618 

88,204 
746 
22,735 
— 
(7)
(282,840)

76,456 

7,122 
410 
17,849 
— 
67 
(92,562)

9,342 

See accompanying notes to consolidated financial statements.

124

 
 
 
 
 
 
Akebia Therapeutics, Inc.

Consolidated Statements of Cash Flows

(in thousands)

Operating activities:
Net loss
Adjustments to reconcile net loss to net cash used in operating activities:

Depreciation and amortization
Amortization of intangibles
Intangible asset impairment charge
Non-cash interest expense related to sale of future royalties
Non-cash royalty revenue related to sale of future royalties
Amortization of premium/discount on investments
Non-cash collaboration revenue
Non-cash research and development expense
Non-cash interest expense
Non-cash operating lease expense
Non-cash loss on extinguishment of debt
Fair value step-up of inventory sold or written off
Write-down of inventory
Change in excess inventory purchase commitments
Stock-based compensation
Change in fair value of derivative liability
Changes in operating assets and liabilities:

Accounts receivable
Inventory
Prepaid expenses and other current assets
Operating lease assets
Other long-term assets
Accounts payable
Accrued expense
Operating lease liabilities
Deferred revenue
Other non-current liabilities
Net cash used in operating activities

Investing activities:

Purchase of property and equipment
Purchase of available for sale securities
Proceeds from the maturities of available for sale securities
Net cash provided by (used in) investing activities

Financing activities:

Proceeds from sale of future royalties, net
Proceeds from refund liabilities to customers
Proceeds from the issuance of common stock, net of issuance costs
Proceeds from the sale of stock under employee stock purchase plan
Proceeds from the exercise of stock options
Proceeds from the issuance of debt, net
Payments on debt

Net cash provided by financing activities

Increase (decrease) in cash, cash equivalents, and restricted cash
Cash, cash equivalents, and restricted cash at beginning of the period
Cash, cash equivalents, and restricted cash at end of the period

Non-cash financing activities
Unpaid offering costs

Cash paid for:
Interest

Year Ended December 31,

2022

2021

2020

$

(92,562) $

(282,840) $

(383,457)

1,654 
36,043 
— 
6,182 
(1,777)
— 
(9,550)
8,768 
2,121 
(2,417)
406 
— 
30,242 
(67,618)
17,849 
(1,060)

11,695 
19,793 
381 
— 
(5,623)
1,501 
(38,227)
2,311 
4,654 
2,080 
(73,154)

(114)
— 
— 
(114)

1,927 
36,043 
— 
9,117 
(821)
(15)
— 
— 
1,165 
(1,842)
— 
21,575 
15,618 
33,391 
22,735 
(600)

(24,022)
(25,847)
(18,658)
(13,888)
5,674 
(11,735)
(24,680)
15,398 
1,821 
(12,481)
(252,965)

(59)
— 
40,000 
39,941 

— 
40,000 
7,121 
410 
67 
— 
(33,000)
14,598 
(58,670)
151,839 
93,169  $

44,783 
— 
88,202 
746 
— 
— 
— 
133,731 
(79,293)
231,132 
151,839  $

—  $

2  $

6,755 

9,632 

$

$

2,075 
31,515 
115,527 
— 
— 
(47)
— 
— 
1,534 
(2,037)
— 
68,240 
20,072 
25,114 
24,460 
286 

12,011 
6,163 
(8,119)
— 
(2,779)
3,678 
6,356 
1,411 
(32,391)
— 
(110,388)

(317)
(99,932)
60,245 
(40,004)

— 
— 
209,419 
1,100 
1,226 
19,975 
— 
231,720 
81,328 
149,804 
231,132 

100 

7,843 

See accompanying notes to consolidated financial statements.

125

 
 
 
 
Akebia Therapeutics, Inc.

Notes to Consolidated Financial Statements

1. Nature of Organization and Operations

®

Akebia Therapeutics, Inc., referred to as Akebia or the Company, was incorporated in the State of Delaware in 2007. Akebia is a fully integrated
biopharmaceutical company with the purpose of bettering the lives of people impacted by kidney disease. The Company has one commercial product,
Auryxia  (ferric citrate), which is approved by the U.S. Food and Drug Administration, or FDA, and marketed for two indications in the United States: the
control of serum phosphorus levels in adult patients with chronic kidney disease, or CKD, on dialysis, or DD-CKD, and the treatment of iron deficiency
anemia, or IDA, in adult patients with CKD not on dialysis, or NDD-CKD. Ferric citrate is also approved and marketed in Japan as an oral treatment for
IDA in adult patients for the improvement of hyperphosphatemia in such patients with DD-CKD and NDD-CKD under the trade name Riona (ferric citrate
hydrate).

Vadadustat, the Company’s lead investigational product candidate, is an investigational oral hypoxia-inducible factor prolyl hydroxylase, or HIF-PH,
inhibitor designed to mimic the physiologic effect of altitude on oxygen availability. On March 29, 2022, the Company received a complete response letter,
or CRL, from the FDA. The CRL provided that the FDA had completed its review of the Company's new drug application, or NDA, for vadadustat for the
treatment of anemia due to CKD in adult patients and had determined that it could not approve the NDA in its present form. In October 2022, the Company
submitted a Formal Dispute Resolution Request, or FDRR, with the FDA. The FDRR focused on the favorable balance between the benefits and risks of
vadadustat for the treatment of anemia due to CKD in adult DD-CKD patients in light of safety concerns expressed by the FDA in the CRL for dialysis
patients related to the rate of adjudicated thromboembolic events driven by vascular access thrombosis for vadadustat compared to the active comparator
and the risk of drug-induced liver injury. In February 2023, we received a second interim response from the FDA to our FDRR. On May 12, 2022, the
Company received notice from its former collaboration partner, Otsuka Pharmaceutical Co. Ltd., or Otsuka, that Otsuka had elected to terminate the
Collaboration and License Agreement dated December 18, 2016, or the Otsuka U.S. Agreement, and the Collaboration and License Agreement dated April
25, 2017, or the Otsuka International Agreement. On June 30, 2022, the Company and Otsuka entered into a Termination and Settlement Agreement, or the
Termination Agreement, pursuant to which, among other things, the Company and Otsuka agreed to terminate the Otsuka U.S. Agreement and the Otsuka
International Agreement as of June 30, 2022 (see Note 4 for further details). In October 2021, Otsuka submitted a Marketing Authorization Application, or
MAA, for vadadustat for the treatment of anemia due to CKD in adult patients with DD-CKD and NDD-CKD to the European Medicines Agency, or
EMA. In connection with the Termination Agreement, Otsuka transferred the MAA for vadadustat with the EMA to the Company. Vadadustat is approved
in Japan as a treatment for anemia due to CKD in both DD-CKD and NDD-CKD patients under the trade name Vafseo , and marketed and sold in Japan
by Mitsubishi Tanabe Pharma Corporation, or MTPC.

TM  

In addition, the Company continues to explore additional development opportunities to expand its pipeline and portfolio of novel therapeutics.

Since inception, the Company has devoted most of its resources to research and development, including its preclinical and clinical development activities,
commercializing Auryxia, and providing general and administrative support for these operations. The Company began recording revenue from the U.S.
sales of Auryxia and revenue from sublicensing rights to Auryxia in Japan from the Company’s Japanese partners, Japan Tobacco, Inc. and its subsidiary
Torii Pharmaceutical Co., Ltd., collectively JT and Torii, in December 2018. Additionally, following regulatory approval of vadadustat in Japan, the
Company began recognizing royalty revenues from MTPC from the sale of Vafseo in August 2020. In February 2021, the Company entered into a royalty
interest acquisition agreement with HealthCare Royalty Partners IV, L.P., or HCR, or the Royalty Agreement, whereby the Company sold its right to
receive royalties and sales milestones under its Collaboration Agreement with MTPC, or the MTPC Agreement, subject to certain caps and other terms and
conditions (see Note 6 for additional information). The Company has not generated a profit to date, and may never generate profits, from product sales.
Vadadustat and the Company’s other potential product candidates are subject to long development cycles, and the Company may be unsuccessful in its
efforts to develop, obtain marketing approval for or market vadadustat and its other potential product candidates. If the Company does not successfully
commercialize Auryxia, vadadustat, if approved, or any other potential product candidate, it may be unable to achieve profitability.

Going Concern

The Company’s management completed its going concern assessment in accordance with Accounting Standards Codification, or ASC, 205-40, Disclosure
of Uncertainties about an Entity’s Ability to Continue as a Going Concern, or ASC 205-40. Pursuant to the requirements of ASC 205-40, the Company’s
management must evaluate whether there are conditions or events considered in the aggregate, that raise substantial doubt about the Company’s ability to
continue as a going concern within one

126

year after the date the financial statements are issued. This evaluation initially does not take into consideration the potential mitigating effect of
management’s plans that have not been fully implemented as of the date the financial statements are issued.

The Company’s operating plan during 2022 included the planned completion of several operating changes that the Company implemented over the course
of the year. These assumptions pertained to cost avoidance measures and the reduction of overhead costs that would result from the planned amendment of
contractual arrangements with certain supply and collaboration partners, and the reduction of operating expenses, which were outside of the Company’s
control. Over the course of 2022, and completing in the fourth quarter, the Company executed on certain of these cost avoidance measures and reduction of
overhead costs from the amendment or termination of contractual arrangements with certain supply partners as well as the reduction of future operating
expenses, which is consistent with the Company’s plan to fund operations with existing cash resources and cash from operations.

Examples of these reductions include the amendment, assignment and termination of certain supply agreements for both vadadustat and Auryxia. For
example, on December 22, 2022, the Company and BioVectra Inc., or BioVectra, entered into a Termination Agreement, or the BioVectra Termination
Agreement, pursuant to which the parties agreed, among other things, to terminate, effective immediately, any and all existing agreements entered into
between the parties in connection with the manufacture and supply, by BioVectra to the Company, of Auryxia drug substance. Under the terms of the
BioVectra Termination Agreement, the Company agreed to pay BioVectra a total of $32.5 million consisting of (i) an upfront payment of $17.5 million and
(ii) six quarterly payments of $2.5 million commencing in April 2024, totaling $15.0 million. Pursuant to the BioVectra Termination Agreement, each of
the Company and BioVectra have released one another from all existing and future claims and liabilities and the return of certain materials and documents.
Furthermore, as it relates to all open purchase orders, BioVectra is relieved from any obligations to manufacture any product or perform services under any
such open purchase orders, and the Company is relieved from any obligations to purchase any product under such open purchase orders. The Company is
also relieved from any obligations to pay any outstanding invoices related to performance by BioVectra of services and all other obligations under the
agreements.

Additionally, on December 16, 2022, the Company, Mitsubishi Tanabe Pharma Corporation, or MTPC, and Esteve Química, S.A., or Esteve, executed the
Assignment Agreement, pursuant to which the Supply Agreement between the Company and Esteve was assigned to MTPC. The Assignment Agreement
transferred the rights and obligations of the Supply Agreement to MTPC, specifically including the obligations under certain purchase orders issued by the
Company and accepted by Esteve. As such, the transferred purchase orders will continue to have a binding effect on MTPC to take delivery of the product
from Esteve in accordance with the terms of the Supply Agreement. The Company will have no further obligation to take delivery of or pay for product
delivered by Esteve under the transferred purchase orders.

In relation to cost avoidance measures, in November 2022, the Board of Directors approved a reduction of the Company’s workforce by approximately
14% consisting solely of individuals within the commercial organization as a result of the Company’s decision to shift to a strategic account management
focused model for its commercial efforts. This shift is due to multiple factors, including the maturity of Auryxia®, the continued impact of the COVID-19
pandemic on dialysis centers and the phosphate binder market and that, if the Company is successful in its appeal of the complete response letter for
vadadustat with the U.S. Food and Drug Administration, the Company’s commercial focus for vadadustat will be limited to the dialysis patient population
for the foreseeable future.

As of December 31, 2022, the Company had cash and cash equivalents of approximately $90.5 million. Based on its current operating plan, the Company
believes that its cash resources will be sufficient to allow the Company to fund its current operating plan through at least the next twelve months from the
filing of the Company’s 2022 Annual Report on Form 10-K. If the Company’s operating performance deteriorates significantly from the levels achieved in
2022, it could have an effect on the Company’s liquidity and its ability to continue as a going concern in the future. The Company expects to finance future
cash needs through product revenue, potential strategic transactions, public or private equity or debt transactions, operating expense management, or a
combination of these approaches. Assuming the Company is successful in executing its operating plan, the Company will require additional funding to fund
its strategic growth beyond Auryxia or to pursue later stage development and commercial activities for its product candidates and any additional product or
product candidates, including those that may be in-licensed or acquired. There can be no assurance that the current operating plan will be achieved in the
time frame anticipated by the Company, or that its cash resources will fund our operating plan for the period anticipated by the Company, or that additional
funding will be available on terms acceptable to the Company, or at all.

2. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances
and transactions have been eliminated in consolidation. These consolidated financial statements have been prepared in conformity with accounting
principles generally accepted in the United States of America (U.S. GAAP). Any reference in these notes to applicable guidance is meant to refer to the
authoritative U.S. GAAP as found in the Accounting

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Standards Codification, or ASC, and Accounting Standards Update, or ASU, of the Financial Accounting Standards Board, or FASB.

New Accounting Pronouncements – Recently Adopted

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial
Reporting. The amendments provide optional guidance for a limited time to ease the potential burden in accounting for reference rate reform. The new
guidance provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by
reference rate reform if certain criteria are met. The amendments apply only to contracts and hedging relationships that reference LIBOR or another
reference rate expected to be discontinued due to reference rate reform. These amendments are effective immediately and may be applied prospectively to
contract modifications made and hedging relationships entered into or evaluated on or before December 31, 2022. The adoption of this standard did not
have a material impact on the Company’s consolidated financial statements and related disclosures.

Segment Information

Operating segments are defined as components of an enterprise about which separate discrete information is available for evaluation by the chief operating
decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. The Company views its operations and
manages its business in one operating segment, which is the business of developing and commercializing novel therapeutics for people with kidney disease.

Derivative Financial Instruments

The Company accounts for warrants and other derivative financial instruments as either equity or liabilities in accordance with ASC Topic 815, Derivatives
and Hedging, or ASC 815, based upon the characteristics and provisions of each instrument. Warrants classified as equity are recorded at fair value as of
the date of issuance on the Company’s consolidated balance sheets and no further adjustments to their valuation are made. Warrants classified as derivative
liabilities and other derivative financial instruments that require separate accounting as liabilities are recorded on the Company’s consolidated balance
sheets at their fair value on the date of issuance and will be revalued on each subsequent balance sheet date until such instruments are exercised or expire,
with any changes in the fair value between reporting periods recorded as other income or expense. The warrant, or the Warrant, to purchase shares of the
Company's common stock issued by the Company in connection with the Janssen Pharmaceutica NV Research and License Agreement, or the Janssen
Agreement, expired on February 9, 2022. The derivative liability recorded in connection with the Company’s Loan Agreement with Pharmakon is
classified as a liability in the Company’s consolidated balance sheet (see Note 11).

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported
amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of
revenues and expenses during the reporting period. Actual results may differ from those estimates. Management considers many factors in selecting
appropriate financial accounting policies and controls, and in developing the estimates and assumptions that are used in the preparation of these financial
statements. Management must apply significant judgment in this process. In addition, other factors may affect estimates, including expected business and
operational changes, sensitivity and volatility associated with the assumptions used in developing estimates, and whether historical trends are expected to
be representative of future trends. The estimation process often may yield a range of potentially reasonable estimates of the ultimate future outcomes, and
management must select an amount that falls within that range of reasonable estimates. Estimates are used in the following areas, among others: prepaid
and accrued research and development expense, operating lease assets and liabilities, derivative liabilities, refund liabilities to customers, other non-current
liabilities, the excess purchase commitment liability, stock-based compensation expense, product and collaboration revenues including various rebates and
reserves related to product sales, non-cash interest expense on the liability related to sale of future royalties, inventories, income taxes, intangible assets and
goodwill.

Although the Company regularly assesses these estimates, actual results could differ materially from these estimates. Changes in estimates are recorded in
the period they become known. The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable
under the circumstances.

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Cash, Cash Equivalents, and Restricted Cash

Cash and cash equivalents consist of all cash on hand, deposits and funds invested in available for sale securities with original maturities of three months or
less at the time of purchase. Cash equivalents are reported at fair value. At December 31, 2022, the Company’s cash is primarily in money market funds.
The Company may maintain balances with its banks in excess of federally insured limits.

Restricted cash represents amounts required for security deposits under the Company’s office and lab space lease agreements. Restricted cash is included in
“prepaid expenses and other current assets” and “other assets” in the consolidated balance sheets.

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported in the consolidated balance sheet that sum to the total of
the amounts reported in the consolidated statement of cash flows (in thousands):

Cash and cash equivalents
Prepaid expenses and other current assets
Other assets
Total cash, cash equivalents, and restricted cash shown
   in the statement of cash flows

December 31, 2022

December 31, 2021

December 31, 2020

$

$

90,466  $
— 
2,703 

149,800  $
— 
2,039 

228,698 
395 
2,039 

93,169  $

151,839  $

231,132 

Accounts Receivable

The Company’s accounts receivable represent amounts due to the Company from product sales (see Note 3) and from its collaboration agreement with
MTPC (see Note 4). Reimbursable costs that have not been invoiced as of the balance sheet date are recorded as unbilled accounts receivable. Accounts
receivable arising from product sales primarily represent amounts due from wholesale distributors as well as certain specialty pharmacy providers, or
collectively, Customers. The Company deducts trade allowances for prompt payment, among other discounts, from its accounts receivable based on its
experience that the Company’s Customers will earn these discounts and fees.

The Company makes judgments as to its ability to collect outstanding receivables and provides an allowance for receivables when collection becomes
doubtful. Provisions are made based upon a specific review of all significant outstanding invoices and the overall quality and age of those invoices not
specifically reviewed as well as historical payment patterns and existing economic factors. The Company believes that credit risks associated with its
customers and collaboration partners are not significant. The Company did not have a material allowance for doubtful accounts as of December 31, 2022
and 2021.

Concentrations of Credit Risk and Off-Balance Sheet Risk

Cash, cash equivalents, and accounts receivable are the only financial instruments that potentially subject the Company to concentrations of credit risk. The
Company maintains its cash and cash equivalents with high quality, accredited financial institutions and, accordingly, such funds are subject to minimal
credit risk. The Company’s investment policy includes guidelines on the quality of the institutions and financial instruments and defines allowable
investments that the Company believes minimizes the exposure to concentration of credit risk. The Company has no significant off-balance sheet
concentrations of credit risk, such as foreign currency exchange contracts, option contracts or other hedging arrangements.

Accounts receivable represent amounts due from the Company’s customers and collaboration partners. As part of its credit management policy, the
Company performs ongoing credit evaluations of its Customers and generally does not require collateral from any customer. The Company also monitors
economic conditions of its collaboration partners to identify facts or circumstances that may indicate that any of its accounts receivable are at risk of
collection.

Gross revenues and accounts receivable from each of the Company’s Customers or collaboration partners who individually accounted for 10% or more of
total gross revenues and/or 10% or more of total gross accounts receivable consisted of the following:

129

 
Fresenius Medical Care Rx
Otsuka Pharmaceutical Co. Ltd.
AmerisourceBergen Drug Corporation
McKesson Corporation
Cardinal Health, Inc.

Fresenius Medical Care Rx
AmerisourceBergen Drug Corporation
Cardinal Health, Inc.
McKesson Corporation
Otsuka Pharmaceutical Co. Ltd.
MTPC

Property and Equipment

Percent of Total Gross Revenues

Years Ended December 31,

2022

2021

2020

34 %
20 %
15 %
— %
— %

33 %
14 %
16 %
13 %
11 %

Percent of Gross Accounts Receivable

As of December 31,

2022

2021

44 %
16 %
13 %
10 %
— %
— %

29 %
29 %
12 %
11 %
— %

16 %
15 %
10 %
— %
22 %
20 %

Property and equipment is stated at cost, less accumulated depreciation. Assets under capital lease are included in property and equipment. Property and
equipment is depreciated using the straight-line method over the estimated useful lives of the assets, generally three years to seven years. Such costs are
periodically reviewed for recoverability when impairment indicators are present. Such indicators include, among other factors, unused capacity, market
value declines and technological obsolescence. Recorded values of asset groups of equipment that are not expected to be recovered through undiscounted
future net cash flows are written down to current fair value, which generally is determined from estimated discounted future net cash flows (assets held for
use) or net realizable value (assets held for sale).

The following is the summary of property and equipment and related accumulated depreciation as of December 31, 2022 and 2021.
December 31, 2022

Useful Life

December 31, 2021

Computer equipment and software
Furniture and fixtures
Equipment
Leasehold improvements

Less accumulated depreciation

Net property and equipment

3

5

-

7

7
Shorter of the useful life or
remaining lease term

$

$

(in thousands)

1,010  $
2,086 
2,750 

8,687 
14,533 
(9,319)
5,214  $

1,010 
2,086 
2,750 

8,573 
14,419 
(7,665)
6,754 

Depreciation expense was approximately $1.7 million, $1.9 million and $2.1 million for the years ended December 31, 2022, 2021 and 2020, respectively.

Leases

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which supersedes the existing guidance for lease accounting, Leases (Topic 840).
ASU 2016-02 requires entities to recognize right-of-use assets and lease liabilities for leases with lease terms of more than 12 months on their balance
sheets and provide enhanced disclosures. In 2018, the FASB issued

130

 
 
 
 
 
 
 
 
 
 
 
 
 
 
additional ASUs related to Topic 842, or ASC 842, that clarified various aspects of the new lease guidance, including how to record certain transition
adjustments, as well as other improvements and practical expedients.

The Company made an accounting policy election not to recognize leases with an initial term of 12 months or less within its consolidated balance sheets
and to recognize those lease payments on a straight-line basis in its consolidated statements of operations. The Company also made the accounting policy
election not to separate the non-lease components from the lease components for its building leases and, rather, account for each non-lease component and
lease component as a single component.

The Company determines if an arrangement is a lease at inception. An arrangement is determined to contain a lease if the contract conveys the right to
control the use of an identified property, plant, or equipment for a period of time in exchange for consideration. If the Company can benefit from the
various underlying assets of a lease on their own or together with other resources that are readily available, or if the various underlying assets are neither
highly dependent on nor highly interrelated with other underlying assets in the arrangement, they are considered to be a separate lease component. In the
event multiple underlying assets are identified, the lease consideration is allocated to the various components based on each of the component’s relative fair
value.

Operating lease assets represent the Company’s right to use an underlying asset for the lease term and operating lease liabilities represent its obligation to
make lease payments arising from the leasing arrangement. Operating lease assets and operating lease liabilities are recognized at the commencement date
based on the present value of lease payments over the lease term. The Company uses the implicit rate when readily determinable and uses an estimate of its
incremental borrowing rate when the implicit rate is not readily determinable based upon the available information at the commencement date of lease
inception. The incremental borrowing rate is determined using a credit rating scoring model to estimate the Company’s credit rating, adjusted for
collateralization. The calculation of the operating lease assets includes any lease payments made and excludes any lease incentives. The Company’s lease
terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option.

The Company’s operating leases are reflected in prepaid expenses and other current assets, operating lease assets, accrued expenses and operating lease
liabilities, net of current portion in its consolidated balance sheets. Lease expense for minimum lease payments is recognized on a straight-line basis over
the lease term.

Inventory

The Company values its inventories at the lower-of-cost or net realizable value. The Company determines the cost of its inventories, which includes
amounts related to materials and manufacturing overhead, on a first-in, first-out basis. The Company classifies its inventory costs as long-term, in other
assets in its consolidated balance sheets, when it expects to utilize the inventory beyond their normal operating cycle.

Prior to the regulatory approval of a product candidate, the Company incurs expenses for the manufacture of material that could potentially be available to
support the commercial launch of its products upon approval. Until the first reporting period when regulatory approval has been received or is otherwise
considered probable and the future economic benefit is expected to be realized, the Company records all such costs as research and development expense.
Inventory used in clinical trials is also expensed as research and development expense, when selected for such use. Inventory that can be used in either the
production of clinical or commercial products is expensed as research and development costs when identified for use in a clinical manufacturing campaign.

The Company performs an assessment of the recoverability of capitalized inventory during each reporting period, and writes down any excess and obsolete
inventory to its net realizable value in the period in which the impairment is first identified. Such impairment charges, should they occur, are recorded as a
component of cost of product sales in the consolidated statements of operations and comprehensive loss. The determination of whether inventory costs will
be realizable requires the use of estimates by management. If actual market conditions are less favorable than projected by management, additional write-
downs of inventory may be required. Additionally, the Company’s product is subject to strict quality control and monitoring that it performs throughout the
manufacturing process. In the event that certain batches or units of product do not meet quality specifications, the Company will record a charge to cost of
product sales, to write-down any unmarketable inventory to its estimated net realizable value. In all cases, product inventory is carried at the lower of cost
or its estimated net realizable value.

Debt

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The Company performs an assessment of all embedded features of a debt instrument to determine if (1) such features should be bifurcated and separately
accounted for, and (2) if bifurcation requirements are met, whether such features should be classified and accounted for as equity or liability instruments. If
the embedded feature meets the requirements to be bifurcated and accounted for as a liability, the fair value of the embedded feature is measured initially,
included as a liability on the consolidated balance sheet, and re-measured to fair value at each reporting period. Any changes in fair value are recorded in
the consolidated statement of operations. The Company monitors, on an ongoing basis, whether events or circumstances could give rise to a change in the
classification of embedded features.

Liability Related to Sale of Future Royalties

The Company treats the liability related to sale of future royalties (see Note 6) as a debt financing, amortized under the effective interest rate method over
the estimated life of the related expected royalty stream. The liability related to sale of future royalties and the debt amortization are based on the
Company’s current estimates of future royalties expected to be paid over the life of the arrangement. The Company will periodically assess the expected
royalty payments. To the extent the Company’s estimates of future royalty payments are greater or less than previous estimates or the estimated timing of
such payments is materially different than previous estimates, the Company will adjust the effective interest rate and recognize related non-cash interest
expense on a prospective basis. Non-cash royalty revenue is reflected as royalty revenue within license, collaboration and other revenue, and non-cash
amortization of debt is reflected as interest expense in the consolidated statements of operations and comprehensive loss.

Refund Liability to Customer

The Company treats the refund liability to customer as a zero-coupon debt financing, which is recorded at net present value. The Company recorded an
initial discount on the refund liability to the customer and a corresponding deferred gain to the refund liability to customer on the consolidated balance
sheet as of the date the funds were received from CSL Vifor, which was March 18, 2022. The discount on the note payable is being amortized to interest
expense using the effective interest method over the expected term of the refund liability. The deferred gain is being amortized to interest income on a
straight-line basis over the expected term of the refund liability.

Restructuring

Restructuring charges principally consist of one-time termination benefits and contractual termination benefits for severance, healthcare, and related
benefits as well as non-cash share-based compensation expense. The Company records restructuring charges based on whether the termination benefits are
provided under an on-going benefit arrangement or under a one-time benefit arrangement. The Company accounts for on-going benefit arrangements, such
as those documented by employment agreements, in accordance with Accounting Standards Codification 712, or ASC 712, Nonretirement Postemployment
Benefits. Under ASC 712, liabilities for postemployment benefits are recorded at the time the obligations are probable of being incurred and can be
reasonably estimated. The Company accounts for one-time employment benefit arrangements in accordance with ASC 420 Exit or Disposal Cost
Obligations. When applicable, the Company records such costs into operating expense.

Excess Purchase Commitment Liability

The Company identified executory contracts in the commercial supply agreements between Keryx and its contract manufacturers for Auryxia, which
include future firm purchase commitments. These executory contracts were deemed to have an off-market element related to the amount of purchase
commitments that exceed the current forecast and as such, the Company recorded a liability in purchase accounting. The Company re-evaluates the excess
purchase commitments each reporting period to assess whether any adjustments to the excess purchase commitment liability are necessary. This evaluation
includes reviewing the contractual minimums, expiration and utilization assumptions, and sales forecasts. Inventory receipts that have been previously
identified as excess are recorded as a reduction to the excess purchase commitment liability.

Revenue Recognition

The Company generates revenues primarily from sales of Auryxia, see Note 3, from its collaboration with MTPC and its prior collaboration agreements
with Otsuka, see Note 4. The Company recognizes revenue in accordance with ASC 606, which applies to all contracts with customers, except for contracts
that are within the scope of other standards. Under ASC 606, the Company recognizes revenue when its customer obtains control of promised goods or
services, in an amount that reflects the consideration which the entity expects to receive in exchange for those goods or services. To determine revenue
recognition for arrangements that the Company determines are within the scope of ASC 606, it performs the following five steps:

identify the contract(s) with a customer;

(i)
(ii) identify the performance obligations in the contract;

132

(iii) determine the transaction price;
(iv) allocate the transaction price to the performance obligations in the contract; and
(v) recognize revenue when (or as) the entity satisfies a performance obligation.  

The Company only applies the five-step model to contracts when it is probable that the entity will collect the consideration it is entitled to in exchange for
the goods or services it transfers to the customer. At contract inception, once the contract is determined to be within the scope of ASC 606, the Company
assesses the goods or services promised within each contract and determines those that are performance obligations, and assesses whether each promised
good or service is distinct. The Company then recognizes as revenue the amount of the transaction price that is allocated to the respective performance
obligation when (or as) the performance obligation is satisfied. 

The Company does not include a financing component to its estimated transaction price at contract inception unless it estimates that certain performance
obligations will not be satisfied within one year. Additionally, the Company recognizes the incremental costs of obtaining a contract as an expense when
incurred if the amortization period of the asset that the Company otherwise would have recognized is one year or less.

Product Revenue, Net

The Company sells Auryxia in the United States, or U.S., primarily to wholesale distributors as well as certain specialty pharmacy providers, collectively,
Customers. These Customers resell the Company’s product to health care providers and patients. In addition to distribution agreements with Customers, the
Company enters into arrangements with health care providers and payors that provide for government-mandated and/or privately-negotiated rebates,
chargebacks, and discounts with respect to the purchase of the Company’s product.

The Company recognizes revenue on product sales when the Customer obtains control of the Company’s product, which occurs at a point in time, typically
upon delivery to the Customer. The Company expenses incremental costs of obtaining a contract as and when incurred if the expected amortization period
of the asset that it would have recognized is one year or less.

Reserves for Variable Consideration

Revenue from product sales is recorded at the net sales price (transaction price), which includes estimates of variable consideration for which reserves are
established and which result from discounts, returns, chargebacks, rebates, co-pay assistance and other allowances that are offered within contracts between
the Company and its Customers, health care providers, payors and other indirect customers relating to the Company’s sales of its products. These reserves
are based on the amounts earned or to be claimed on the related sales and are classified as reductions of accounts receivable (if the amount will be credited
to the Customer) or as a current liability (if the amount is payable to a Customer or a party other than a Customer). When appropriate, these estimates take
into consideration a range of possible outcomes which are probability-weighted in accordance with the expected value method in ASC 606 for relevant
factors such as the Company’s historical experience, current contractual and statutory requirements, specific known market events and trends, industry data,
and forecasted customer buying and payment patterns. Overall, these reserves reflect the Company’s best estimates of the amount of consideration to which
it is entitled based on the terms of the respective underlying contracts.

The amount of variable consideration that is included in the transaction price may be constrained, and is included in the net sales price only to the extent
that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. Actual amounts of
consideration ultimately received may differ from the Company’s estimates. If actual results in the future vary from the Company’s estimates, the Company
will adjust these estimates, which would affect net product revenue and earnings in the period such variances become known.

Trade Discounts and Allowances: The Company generally provides Customers with discounts that include incentive fees that are explicitly stated in the
Company’s contracts and are recorded as a reduction of revenue in the period the related product revenue is recognized. In addition, the Company
compensates (through trade discounts and allowances) its Customers for sales order management, data, and distribution services. However, the Company
has determined such services received to date are not distinct from the Company’s sale of products to the Customer and, therefore, these payments have
been recorded as a reduction of revenue within the consolidated statement of operations and comprehensive loss through December 31, 2022. The
Company records a corresponding reduction to accounts receivable (if the trade discount and/or allowance will be credited to the Customer) or an increase
to accrued expense (if the trade discount and/or allowance is payable to a Customer) on the consolidated balance sheets.

133

Product Returns: Consistent with industry practice, the Company generally offers Customers a limited right of return which allows for the product to be
returned when the product expiry is within an allowable window, when the quantity delivered is different than quantity ordered, the product is damaged in
transit prior to receipt by the customer, or is subject to a recall. This right of return generally lapses once the product is provided to a patient. The Company
estimates the amount of its product sales that may be returned for credit by its Customers and records this estimate as a reduction of revenue in the period
the related product revenue is recognized. The Company currently estimates product return reserve using available industry data and its own historical sales
information, including its visibility into the inventory remaining in the distribution channel.

Provider Chargebacks and Discounts: Chargebacks for fees and discounts to providers represent the estimated obligations resulting from contractual
commitments to sell products to qualified healthcare providers at prices lower than the list prices charged to Customers who directly purchase the product
from the Company. Customers charge the Company for the difference between what they pay for the product and the ultimate selling price to the qualified
healthcare providers. These reserves are established in the same period that the related revenue is recognized, resulting in a reduction of product revenue
and accounts receivable. Chargeback amounts are generally determined at the time of resale to the qualified healthcare provider by Customers, and the
Company generally issues credits for such amounts within a few weeks of the Customer’s resale of the product. Reserves for chargebacks consist of credits
that the Company expects to issue for units that remain in the distribution channel at each reporting period end that the Company expects will be sold to
qualified healthcare providers, and chargebacks that Customers have claimed but for which the Company has not yet issued a credit.

Commercial and Medicare Part D Rebates: The Company contracts with various commercial payor organizations, primarily health insurance companies
and pharmacy benefit managers, for the payment of rebates with respect to utilization of its products. The Company estimates the rebates for commercial
and Medicare Part D payors based upon (i) its contracts with the payors and (ii) information obtained from its Customers and other third parties regarding
the payor mix for Auryxia. The Company estimates these rebates and records such estimates in the same period the related revenue is recognized, resulting
in a reduction of product revenue and the establishment of a current liability.

Other Government Rebates: The Company is subject to discount obligations under state Medicaid programs and other government programs. The
Company estimates its Medicaid and other government programs rebates based upon a range of possible outcomes that are probability-weighted for the
estimated payor mix. These reserves are recorded in the same period the related revenue is recognized, resulting in a reduction of product revenue and the
establishment of a current liability which is included in accrued expenses and other current liabilities on the consolidated balance sheets. For Medicare, the
Company also estimates the number of patients in the prescription drug coverage gap for whom the Company will owe an additional liability under the
Medicare Part D program. The Company’s liability for these rebates consists of invoices received for claims from prior quarters that have not been paid or
for which an invoice has not yet been received, estimates of claims for the current quarter, and estimated future claims that will be made for product that
has been recognized as revenue, but which remains in the distribution channel at the end of each reporting period.

Other Incentives: Other incentives that the Company offers include voluntary patient assistance programs such as the Company’s co-pay assistance
program, which are intended to provide financial assistance to qualified commercially insured patients with prescription drug co-payments required by
payors. The calculation of the accrual for co-pay assistance is based on actual claims processed during a given period, as well as historical utilization data
to estimate the amount the Company expects to receive associated with product that has been recognized as revenue, but remains in in the distribution
channel at the end of each reporting period.

Collaboration Revenues

The Company enters into out-license and collaboration agreements which are within the scope of ASC 606, under which it licenses certain rights to its
product candidates to third parties. The terms of these arrangements typically include payment to the Company of one or more of the following: non-
refundable, up-front license fees; development, regulatory, and commercial milestone payments; payments for manufacturing supply services the Company
provides through its contract manufacturers; and royalties on net sales of licensed products. Each of these payments may result in license, collaboration and
other revenue, except for revenues from royalties on net sales of licensed products, which are classified as royalty revenues.

In determining the appropriate amount of revenue to be recognized as the Company fulfills its obligations under each of its agreements, the Company
implements the five-step model noted above. As part of the accounting for these arrangements, the Company must develop assumptions that require
judgment to determine whether the individual promises should be accounted for as separate performance obligations or as a combined performance
obligation, and to determine the stand-alone selling price for each performance obligation identified in the contract. A deliverable represents a separate
performance obligation if both of the following criteria are met: (i) the customer can benefit from the good or service either on its own or together with
other

134

resources that are readily available to the customer, and (ii) the entity’s promise to transfer the good or service to the customer is separately identifiable
from other promises in the contract. The Company uses key assumptions to determine the stand-alone selling price, which may include forecasted revenues,
development timelines, reimbursement rates for personnel costs, discount rates, and probabilities of technical and regulatory success. With regard to the
MTPC and former Otsuka collaboration agreements, the Company recognizes revenue related to amounts allocated to the identified performance obligation
on a proportional performance basis as the underlying services are performed.

Licenses of Intellectual Property

If the license to the Company’s intellectual property is determined to be distinct from the other performance obligations identified in an out-license and
collaboration arrangement, the Company recognizes revenue from non-refundable, up-front fees allocated to the license when the license is transferred to
the customer and the customer is able to use and benefit from the license. For licenses that are bundled with other promises, the Company utilizes judgment
to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point
in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenue from non-refundable, up-front fees. The
Company evaluates the measure of progress each reporting period and, if necessary, adjust the measure of performance and related revenue recognition.

Milestone Payments

At the inception of each arrangement that includes development milestone payments, the Company evaluates whether the milestones are considered
probable of being reached and estimates the amount to be included in the transaction price using the most likely amount method. The Company evaluates
factors such as the scientific, clinical, regulatory, commercial, and other risks that must be overcome to assess the milestone as probable of being achieved.
There is considerable judgment involved in determining whether a milestone is probable of being reached at each specific reporting period. Milestone
payments that are not within the control of the Company or the customer, such as regulatory approvals, are not considered probable of being achieved until
those approvals are received. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the
transaction price. The transaction price is then allocated to each performance obligation on a relative stand-alone selling price basis, for which the
Company recognizes revenues as, or when, the performance obligations under the contract are satisfied. At the end of each subsequent reporting period, the
Company re-evaluates the probability of achievement of such development milestones and any related constraint, and if necessary, adjusts its estimate of
the overall transaction price. Any such adjustments are recorded on a cumulative catch-up basis, which would affect collaboration revenue in the period of
adjustment.  

Manufacturing Supply Services

Arrangements that include a promise for future supply of drug substance or drug product for either clinical development or commercial supply at the
licensee’s discretion are generally considered as options. The Company assesses if these options provide a material right to the licensee and if so, they are
accounted for as separate performance obligations. If the Company is entitled to additional payments when the licensee exercises these options, any
additional payments are recorded in license, collaboration and other revenues when the licensee obtains control of the goods, which is upon delivery.

Royalties

The Company will recognize sales-based royalties, including milestone payments based on the level of sales, at the later of (i) when the related sales occur,
or (ii) when the performance obligation to which some or all of the royalty has been allocated has been satisfied (or partially satisfied). The Company
receives royalty payments from JT and Torii based on net sales of Riona and MTPC based on net sales of Vafseo in Japan.

Collaborative Arrangements

The Company records the elements of its collaboration agreements that represent joint operating activities in accordance with ASC Topic 808,
Collaborative Arrangements (ASC 808). Accordingly, the elements of the collaboration agreements that represent activities in which both parties are active
participants and to which both parties are exposed to the significant risks and rewards that are dependent on the commercial success of the activities are
recorded as collaborative arrangements. The Company considers the guidance in ASC 606-10-15, Revenue from Contracts with Customers – Scope and
Scope Exceptions, in determining the appropriate treatment for the transactions between the Company and its collaborative partners and the transactions
between the Company and third parties. Generally, the classification of transactions under the collaborative arrangements is determined based on the nature
and contractual terms of the arrangement along with the nature of the

135

operations of the participants. Therefore, the Company recognized its allocation of the shared costs incurred with respect to the jointly conducted medical
affairs and commercialization and non-promotional activities under the former Otsuka U.S. Agreement, as defined below in Note 4, as a component of the
related expense in the period incurred. To the extent product revenue is generated from the collaboration, the Company recognizes its share of the net sales
on a gross basis if the Company is deemed to be the principal in the transactions with customers, or on a net basis if the Company is instead deemed to be
the agent in the transactions with customers, consistent with the guidance in ASC 606.

Intangible Assets

The Company maintains a definite-lived intangible asset related to developed product rights for Auryxia. Intangible assets are initially recorded at fair
value and stated net of accumulated amortization and impairments. The Company amortizes its intangible assets that have finite lives using either the
straight-line method, or if reliably determinable, based on the pattern in which the economic benefit of the asset is expected to be utilized. Amortization for
the Company’s intangible asset is recorded over its remaining estimated useful life, which as of December 31, 2022 is estimated to be six years.

The Company reviews intangible assets subject to amortization to determine if any adverse conditions exist or a change in circumstances has occurred that
would indicate impairment or a change in the remaining useful life. If an impairment indicator exists, the Company performs a recoverability test by
comparing the sum of the estimated undiscounted cash flows of the intangible asset group to its carrying value on the consolidated balance sheet. If the
carrying value of the intangible asset group exceeds the undiscounted cash flows used in the recoverability test, the Company will write the carrying value
of the intangible asset group down to the fair value in the period identified. The Company calculates the fair value of the intangible asset group as the
present value of estimated future cash flows expected to be generated from the intangible asset group using a risk-adjusted discount rate. In determining
estimated future cash flows associated with its intangible asset group, the Company uses market participant assumptions pursuant to ASC Topic 820, Fair
Value Measurements and Disclosures (ASC 820). During the second quarter of 2020, the Company identified indicators of impairment related to the
developed product rights for Auryxia and recorded an impairment charge of $115.5 million (see Note 9).

Goodwill

The Company allocates any excess purchase price over the fair value of the net tangible and intangible assets acquired in a business combination to
goodwill. Goodwill is evaluated for impairment on an annual basis as of October 1, and more frequently if indicators are present or changes in
circumstances suggest that impairment may exist.

The Company compares the fair value of its reporting unit to its carrying value. If the carrying value of the net assets assigned to the reporting unit exceeds
the fair value of its reporting unit, the Company would record an impairment loss equal to the difference. As described above, the Company operates in one
operating segment which the Company considers to be the only reporting unit.

Fair Value of Financial Instruments

The Company is required to disclose information on all assets and liabilities reported at fair value that enables an assessment of the inputs used in
determining the reported fair values. ASC 820 establishes a hierarchy of inputs used in measuring fair value that maximizes the use of observable inputs
and minimizes the use of unobservable inputs by requiring that the observable inputs be used when available.

Observable inputs are inputs that market participants would use in pricing the asset or liability based on market data obtained from sources independent of
the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the inputs that market participants would use in pricing the
asset or liability, and are developed based on the best information available in the circumstances. The fair value hierarchy applies only to the valuation
inputs used in determining the reported fair value of the investments, and is not a measure of the investment credit quality. The three levels of the fair value
hierarchy are described below:

•

•

•

Level 1 – Valuations based on unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the
ability to access at the measurement date.

Level 2 – Valuations based on quoted prices for similar assets or liabilities in markets that are not active, or for which all significant
inputs are observable, either directly or indirectly.

Level 3 – Valuations that require inputs that reflect the Company’s own assumptions that are both significant to the fair value
measurement and unobservable.

136

To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires
more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3.
A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.

Items measured at fair value on a recurring basis include derivative liabilities (see Note 7). The carrying amounts of prepaid expenses and other current
assets, accounts payable and accrued expenses approximate their fair values due to their short-term maturities.

Items measured at fair value on a nonrecurring basis include property and equipment, intangible assets and goodwill. The Company remeasures the fair
value of these assets upon the occurrence of certain events. There were no impairments to assets measured using Level 3 inputs during the years ended
December 31, 2022 and 2021.

The Company’s other financial instruments mainly consists of debt (see Note 11). The carrying amount for the Company’s Loan Agreement with
Pharmakon approximates fair value because the interest rate is variable and reflects current market rates.

Research and Development Costs

Research and development costs are expensed as incurred. Research and development expenses are comprised of costs incurred in providing research and
development activities, including salaries and benefits, facilities costs, overhead costs, contract research and development services, and other outside costs.
Non-refundable advance payments for goods and services that will be used in future research and development activities are expensed when the activity has
been performed or when the goods have been received rather than when the payment is made.

External research and development expenses associated with the Company’s programs include clinical trial site costs, research compounds and clinical
manufacturing costs, costs incurred for consultants and other outside services, such as data management and statistical analysis support, and materials and
supplies used in support of the clinical and preclinical programs. Internal costs of the Company’s clinical program include salaries, benefits, stock-based
compensation, and an allocation of the Company’s facility costs. When third-party service providers’ billing terms do not coincide with the Company’s
period-end, the Company is required to make estimates of its obligations to those third parties, including clinical trial and pharmaceutical development
costs, contractual services costs and supply costs, incurred in a given accounting period and record accruals at the end of the period. The Company bases its
estimates on its knowledge of the research and development programs, services performed for the period, past history for related activities and the expected
duration of the third-party service contract, where applicable.

Advertising Expenses

The costs of advertising are expensed as incurred and included in selling, general and administrative expenses in the consolidated statements of operations
and comprehensive loss. For the years ended December 31, 2022, 2021 and 2020, advertising expenses totaled $6.7 million, $8.2 million and $5.0 million,
respectively, all related to Auryxia.

Income Taxes

Income taxes are recorded in accordance with FASB Topic 740, Income Taxes, or ASC 740, which provides for deferred taxes using an asset and liability
approach. The Company recognizes deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the
financial statements or tax returns. Deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases
of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Valuation allowances are provided, if,
based upon the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. All deferred taxes as of
December 31, 2022 and 2021 are classified as noncurrent within the income tax provision (see Note 13).

The Company accounts for uncertain tax positions in accordance with the provisions of ASC 740. When uncertain tax positions exist, the Company
recognizes the tax benefit of tax positions to the extent that the benefit will more likely than not be realized. The determination as to whether the tax benefit
will more likely than not be realized is based upon the technical merits of the tax position, as well as consideration of the available facts and circumstances.
As of December 31, 2022 and 2021, the Company does not have any significant uncertain tax positions. The Company recognizes interest and penalties
related to uncertain tax positions in income tax expense.

137

Stock-Based Compensation

The Company accounts for its stock-based compensation awards in accordance with ASC Topic 718, Compensation—Stock Compensation, or ASC 718.
ASC 718 requires all stock-based payments to employees and non-employees, including grants of stock options, restricted stock, restricted stock units, or
RSUs, performance-based restricted stock units, or PSUs, and modifications to existing stock awards, to be recognized in the statements of operations and
comprehensive loss based on their fair values. The Company’s stock-based awards are comprised of stock options, RSUs and PSUs. The Company
estimates the fair value of options granted using the Black-Scholes option pricing model. The Company uses the market price at the time of grant to
determine the fair value of restricted stock awards and performance-based restricted stock awards.

The Black-Scholes option pricing model requires the input of certain subjective assumptions, including (a) the expected stock price volatility, (b) the
calculation of expected term of the award, (c) the risk-free interest rate and (d) expected dividends. Prior to 2017, due to the lack of company-specific
historical and implied volatility data for trading the Company’s stock in the public market, the Company had based its estimate of expected volatility on the
historical volatility of a group of similar companies that are publicly traded. The historical volatility was calculated based on a period of time
commensurate with the expected term assumption. The computation of expected volatility was based on the historical volatility of a representative group of
companies with similar characteristics to the Company, including stage of product development and life science industry focus. During 2017, the Company
began to estimate its volatility by using a blend of its stock price history for the length of time it has market data for its stock and the historical volatility of
similar public companies for the expected term of each grant. The Company is a commercial-stage biopharmaceutical company and the representative
group of companies has certain similar characteristics to the Company. The Company believes the group selected has sufficient similar economic and
industry characteristics and includes companies that are most representative of the Company. The Company uses the simplified method as prescribed by the
SEC Staff Accounting Bulletin No. 107, Share-Based Payment, to calculate the expected term for options granted to employees as it does not have
sufficient historical exercise data to provide a reasonable basis upon which to estimate the expected term. The expected term is applied to the stock option
grant group as a whole, as the Company does not expect substantially different exercise or post-vesting termination behavior among its employee
population. For options granted to non-employees, the Company utilizes the contractual term of the arrangement as the basis for the expected term
assumption. The risk-free interest rate is based on a treasury instrument whose term is consistent with the expected life of the stock options. The expected
dividend yield is assumed to be zero as the Company has never paid dividends and has no current plans to pay any dividends on its common stock, which is
similar to the Company’s peer group.

The Company’s stock-based awards are subject to either service- or performance-based vesting conditions. Compensation expense related to awards to
employees and non-employees with service-based vesting conditions is recognized on a straight-line basis based on the grant date fair value over the
associated service period of the award, which is generally the vesting term, and is adjusted for pre-vesting forfeitures in the period in which the forfeitures
occur. Compensation expense related to awards to employees and non-employees with performance-based vesting conditions is recognized based on the
grant date fair value over the requisite service period using the accelerated attribution method to the extent achievement of the performance condition is
probable.

For awards with performance conditions in which the award does not vest unless the performance condition is met, the Company recognizes expense if,
and to the extent that, the Company estimates that achievement of the performance condition is probable. If the Company concludes that vesting is
probable, it recognizes expense from the date it reaches this conclusion through the estimated vesting date.

Net Loss per Share

Basic net loss per share is calculated by dividing net loss by the weighted-average shares outstanding during the period, without consideration for common
stock equivalents. Diluted net loss per share is calculated by adjusting weighted-average shares outstanding for the dilutive effect of common stock
equivalents outstanding for the period, determined using the treasury-stock method. For purposes of the diluted net loss per share calculation, preferred
stock, stock options, warrants, restricted stock and RSUs are considered to be common stock equivalents, but have been excluded from the calculation of
diluted net loss per share, as their effect would be anti-dilutive for all periods presented. Therefore, basic and diluted net loss per share were the same for all
periods presented. Diluted net income per share is calculated by dividing the net income by the weighted-average common shares outstanding for the
period, including any dilutive effect from outstanding options, warrants, restricted stock and RSUs using the treasury stock method.

3. Product Revenue, Net

138

To date, the Company’s only source of product revenue has been from the U.S. sales of Auryxia. Total net product revenue was $177.1 million,
$142.2 million, and $128.9 million for the years ended December 31, 2022, 2021 and 2020, respectively. The following table summarizes activity in each
of the product revenue allowance and reserve categories for the years ended December 31, 2020, 2021, and 2022 (in thousands):

Balance at December 31, 2019

Provisions related to sales in current year
Adjustments related to prior year sales
Credits/payments made
Balance at December 31, 2020

Current provisions related to sales in current year
Adjustments related to prior year sales
Credits/payments made
Balance at December 31, 2021

Current provisions related to sales in current year
Adjustments related to prior year sales
Credits/payments made
Balance at December 31, 2022

Chargebacks
and
Discounts

Rebates, Fees
and other
Deductions

Returns

Total

$

$

$

738  $

10,559 
— 
(10,495)
802 

11,759 
(1)
(11,282)

1,278  $

11,398 
(9)
(11,191)

1,476  $

30,552  $
149,472 
377 
(140,489)
39,912 

133,297 
(1,790)
(144,794)

26,625  $

89,686 
401 
(87,722)
28,990  $

253  $

7,238 

—  $
(6,842) $
649 

5,852 
— 
(6,026)

475  $

5,131 
— 
(4,719)

887  $

31,543 
167,269 
377 
(157,826)
41,363 

150,908 
(1,791)
(162,102)
28,378 

106,215 
392 
(103,632)
31,353 

Chargebacks, discounts and returns are recorded as a direct reduction of revenue on the consolidated statement of operations with a corresponding
reduction to accounts receivable on the consolidated balance sheets. Rebates, distribution-related fees, and other sales-related deductions are recorded as a
reduction in revenue on the consolidated statement of operations with a corresponding increase to accrued liabilities or accounts payable on the
consolidated balance sheets.

Accounts receivable, net related to product sales was approximately $36.2 million and $24.6 million as of December 31, 2022 and 2021, respectively.

4. License, Collaboration and Other Significant Agreements

During the years ended December 31, 2022, 2021 and 2020, the Company recognized the following revenues from its license, collaboration and other
significant agreements and had the following deferred revenue balances as of December 31, 2022:

License, Collaboration and Other Revenue:
MTPC Agreement
Otsuka U.S. Agreement
Otsuka International Agreement

Total Proportional Performance Revenue

JT and Torii
MTPC Other Revenue

Total License, Collaboration and Other Revenue

Deferred Revenue:
MTPC
Vifor Agreement

Total

For the Year Ended December 31,

2022

2021

(in thousands)

2020

17,968  $
86,773 
5,503 
110,244  $
5,291 
— 
115,535  $

12,438  $
36,588 
16,449 
65,475  $
5,814 
73 
71,362  $

15,405 
93,446 
45,451 
154,302 
5,681 
6,423 
166,406 

Short-Term

December 31, 2022

Long-Term

(in thousands)

Total

3,738  $
— 
3,738  $

—  $

43,296 
43,296  $

3,738 
43,296 
47,034 

$

$

$

$

$

139

 
 
 
 
 
 
 
 
 
 
The following table presents changes in the Company’s contract assets and liabilities during the years ended December 31, 2022 and 2021 (in thousands):

Balance at
Beginning of
Period

Additions

Deductions

Balance at End
of Period

Twelve Months Ended December 31, 2022
Contract assets:

Accounts receivable (1)
Prepaid expenses and other current assets

Contract liabilities:

Deferred revenue
Accounts payable

Twelve Months Ended December 31, 2021
Contract assets:

Accounts receivable (1)
Prepaid expenses and other current assets

Contract liabilities:

Deferred revenue
Accounts payable
Accrued expenses and other current liabilities

$
$

$
$

$
$

$
$
$

19,094  $
4,309  $

42,380  $
3,171  $

3,045  $
1,722  $

40,559  $
7,227  $
10,000  $

94,515  $
9,550  $

70,044  $
—  $

64,676  $
2,592  $

83,491  $
3,171  $
—  $

(111,708) $
(13,078) $

(65,390) $
(3,171) $

(48,627) $
(5) $

(81,670) $
(7,227) $
(10,000) $

1,901 
781 

47,034 
— 

19,094 
4,309 

42,380 
3,171 
— 

(1) Excludes accounts receivable from other services related to clinical and regulatory activities performed by the Company on behalf of MTPC that

are not included in the performance obligations identified under the MTPC Agreement as of December 31, 2022 and 2021. Also excludes accounts
receivable related to amounts due to the Company from product sales which are included in the accompanying consolidated balance sheets as of
December 31, 2022 and 2021.  

During the years ended December 31, 2022, 2021 and 2020, the Company recognized the following revenues as a result of changes in the contract asset and
contract liability balances in the respective periods (in thousands):

Revenue Recognized in the Period from:
Amounts included in deferred revenue at the beginning of the period
Performance obligations satisfied in previous periods

Mitsubishi Tanabe Pharma Corporation Collaboration Agreement

Summary of Agreement

For the Year Ended December 31,

2022

2021

2020

$
$

29,574  $
—  $

23,364  $
81  $

36,032 
25,964 

On December 11, 2015, the Company and MTPC entered into a collaboration agreement, or the MTPC Agreement, providing MTPC with exclusive
development and commercialization rights to vadadustat in Japan and certain other Asian countries, collectively, the MTPC Territory, which was amended
effective as of December 2, 2022. In addition, the Company supplies vadadustat to MTPC for both clinical and commercial use in the MTPC Territory.

The Company and MTPC agreed that, instead of including Japanese patients in the Company’s global Phase 3 program for vadadustat, MTPC would be the
sponsor of a Phase 3 program for vadadustat in Japan. MTPC was responsible for the costs of the Phase 3 program in Japan and other studies required in
Japan, and made no funding payments for the global Phase 3 program for vadadustat. In June 2020, vadadustat was approved in Japan for the treatment of
anemia due to CKD, which triggered a $15.0 million regulatory milestone payment to the Company that was received in the third quarter of 2020. In
August 2020, MTPC launched vadadustat commercially in Japan under the trade name Vafseo  as a treatment of anemia due to CKD for adult patients on
dialysis and not on dialysis. MTPC filed a new drug application for vadadustat for the treatment of anemia due to CKD in adult patients in Taiwan in
January 2022 and in Korea in March 2022.

TM

The Company and MTPC have established a joint steering committee pursuant to the MTPC Agreement to oversee development and commercialization of
vadadustat in the MTPC Territory, including approval of any development or

140

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
commercialization plans. Unless earlier terminated, the MTPC Agreement will continue in effect on a country-by-country basis until the later of the
following: expiration of the last-to-expire patent covering vadadustat in such country in the MTPC Territory; expiration of marketing or regulatory
exclusivity in such country in the MTPC Territory; or ten years after the first commercial sale of vadadustat in such country in the MTPC Territory. MTPC
may terminate the MTPC Agreement upon twelve months’ notice at any time after the second anniversary of the effective date of the MTPC Agreement.
Either party may terminate the MTPC Agreement upon the material breach of the other party that is not cured within a specified time period or upon the
insolvency of the other party.

MTPC is required to make certain milestone payments to the Company aggregating up to approximately $225.0 million upon the achievement of specified
development, regulatory and commercial events. More specifically, the Company received $10.0 million in development milestone payments and is eligible
to receive up to $40.0 million in regulatory milestone payments, of which the Company received $10.0 million in relation to the Japanese NDA, or JNDA,
filing in the third quarter of 2019 and earned an additional $15.0 million following regulatory approval of vadadustat in Japan in the second quarter of
2020, which the Company received in the third quarter of 2020, and up to $175.0 million in commercial milestone payments associated with aggregate
sales of all products. In consideration for the exclusive license and other rights contained in the MTPC Agreement, MTPC also made a $20.0 million
upfront payment as well as a payment of $20.5 million for Phase 2 studies in Japanese patients completed by the Company and reimbursed by MTPC. The
Company is also entitled to receive tiered royalty payments ranging from 13% to 20% on annual net sales of vadadustat in the MTPC Territory. Royalty
payments are subject to certain reductions, including upon the introduction of competitive products in certain instances. Royalties are due on a country-by-
country basis from the date of first commercial sale of a licensed product in a country until the last to occur of: (i) the expiration of the last to expire valid
claim within the intellectual property covering the licensed product, (ii) the expiration of marketing or regulatory exclusivity in such country, or (iii) the
tenth anniversary of the first commercial sale of such licensed product in such country. Due to the uncertainty of drug development and commercialization
and the high historical failure rates associated therewith, although the Company has received $10.0 million in development milestones and $25.0 million in
regulatory milestones, no additional milestone may ever be received from MTPC. The Company recognizes any revenue from MTPC royalties in the
period in which the sales occur.

In February 2021, the Company entered into a royalty interest acquisition agreement with HealthCare Royalty Partners IV, L.P., or the Royalty Agreement,
whereby the Company sold its right to receive royalties and sales milestones under the MTPC Agreement, subject to certain caps and other terms and
conditions (see Note 6).

Revenue Recognition

The Company evaluated the elements of the MTPC Agreement in accordance with the provisions of ASC 606 and concluded that the contract counterparty,
MTPC, is a customer. The Company’s arrangement with MTPC contains the following material promises under the contract at inception: (i) license under
certain of the Company’s intellectual property to develop and commercialize vadadustat in the MTPC Territory (the License Deliverable), (ii) clinical
supply of vadadustat (the Clinical Supply Deliverable), (iii) knowledge transfer, (iv) Phase 2 dosing study research services (the Research Deliverable), and
(v) rights to future know-how.

The Company identified two performance obligations in connection with its material promises under the MTPC Agreement as follows: (i) License,
Research and Clinical Supply Performance Obligation and (ii) Rights to Future Know-How Performance Obligation. Factors considered in making the
assessment of which material promises will be accounted for as separate performance obligations included, among other things, the capabilities of the
collaboration partner, whether any other vendor sells the item separately, whether the good or service is highly interdependent or highly interrelated to the
other elements in the arrangement, and whether there are other vendors that can provide the items. Additionally, the MTPC Agreement does not include a
general right of return.

The Company allocates the transaction price to each performance obligation based on the Company’s best estimate of the relative standalone selling price.
The Company developed a best estimate of the standalone selling price for the Rights to Future Know-How Performance Obligation primarily based on the
likelihood that additional intellectual property covered by the license conveyed will be developed during the term of the arrangement and determined it is
immaterial. As such, the Company did not develop a best estimate of standalone selling price for the License, Research and Clinical Supply Performance
Obligation and allocated the entire transaction price to this performance obligation. The deliverables associated with the License, Research and Clinical
Supply Performance Obligation were satisfied as of June 30, 2018.

The transaction price at inception was comprised of: (i) the up-front payment, (ii) the estimated cost for the Phase 2 studies, (iii) a non-substantive
milestone associated with the first patient enrolled in the NDD-CKD Phase 3 study, and (iv) the cost of all clinical supply provided to MTPC for the Phase
3 studies. No other development and no regulatory milestones were included in

141

the transaction price at inception, as all other milestone amounts were fully constrained. Subsequent to inception, the transaction price also included certain
development and regulatory milestones, as described below. As part of its evaluation of the constraint, the Company considers numerous factors, including
that receipt of the milestones is outside the control of the Company and contingent upon success in future clinical trials and the licensee’s efforts. Any
consideration related to sales-based milestones (including royalties) will be recognized when the related sales occur as they were determined to relate
predominantly to the license granted to MTPC and therefore have also been excluded from the transaction price.  The Company re-evaluates the transaction
price in each reporting period and as uncertain events are resolved or other changes in circumstances occur. The Company determined that the remaining
consideration that may be payable to the Company subsequent to MTPC's commercial launch of Vafseo
on net sales, sales milestones, and certain regulatory milestones.

 in the third quarter of 2020 is quarterly royalties

TM,

As of December 31, 2022, the transaction price was comprised of: (i) the up-front payment of $20.0 million, (ii) the cost for the Phase 2 studies of $20.5
million, (iii) the cost of all clinical supply provided to MTPC for the Phase 3 studies, (iv) $10.0 million in development milestones received, (v)
$25.0 million in regulatory milestones received, comprised of $10.0 million relating to the JNDA filing and $15.0 million relating to regulatory approval of
vadadustat in Japan, and (vi) $3.0 million in royalties from net sales of Vafseo. As of December 31, 2022, all development milestones and $25.0 million in
regulatory milestones have been achieved. No other regulatory milestones have been assessed as probable of being achieved and as a result have been fully
constrained. Revenue for the License, Research and Clinical Supply Performance Obligation for the MTPC Agreement is being recognized using a
proportional performance method, for which all deliverables have been completed. Accordingly, the Company recognized the $15.0 million regulatory
milestone relating to regulatory approval of vadadustat in Japan as revenue during the year ended December 31, 2020 and the $10.0 million regulatory
milestone for the filing of the JNDA as revenue during the year ended December 31, 2019, as the regulatory milestones were both deemed probable of
being achieved and the required performance obligations had been satisfied as of December 31, 2020 and 2019, respectively. The Company recognized
$1.8 million, $0.8 million, and $0.4 million of revenue for royalties from the net sales of Vafseo during the years ended December 31, 2022, 2021, and
2020, respectively. As noted above, in February 2021, the Company entered into the Royalty Agreement, whereby the Company sold its right to receive
these royalties and sales milestones under the MTPC Agreement, subject to certain caps and other conditions (see Note 6). The revenue is classified as
collaboration revenue in the accompanying consolidated statements of operations and comprehensive loss. As of December 31, 2022, there is $0.6 million
in accounts receivable, no deferred revenue, and no contract assets. There were no asset or liability balances related to the MTPC Agreement classified as
long-term in the consolidated balance sheet as of December 31, 2022.

Supply of Drug Product to MTPC

In March 2020, in connection with the MTPC Agreement, the Company and MTPC executed an amendment to the MTPC Agreement pursuant to which
the Company agreed to supply MTPC with certain vadadustat process validation drug product for commercial use, and MTPC agreed to reimburse the
Company for certain manufacturing-related expenses. In connection with this arrangement, the Company invoiced the upfront payment of $10.4 million,
which it received during the three months ended June 30, 2020. The Company does not recognize revenue under this arrangement until risk of loss on the
drug product passes to MTPC and delivery has occurred and MTPC has accepted the product. During the years ended December 31, 2022, 2021 and 2020,
the Company recognized $0 million, $0 million, and $6.2 million, respectively, in revenue for drug product that was delivered during the applicable period.
As of December 31, 2022, the Company recorded no accounts receivable, no deferred revenue, no other current liabilities and no other non-current
liabilities for drug product that is subject to return by MTPC.

On July 15, 2020, the Company and its collaboration partner MTPC entered into a supply agreement, or the MTPC Supply Agreement, which was amended
effective as of December 5, 2022. The MTPC Supply Agreement includes the terms and conditions under which the Company supplies vadadustat drug
product to MTPC for commercial use in Japan and certain other Asian countries, as contemplated by the MTPC Agreement.

Pursuant to the MTPC Supply Agreement, MTPC provides a rolling forecast, or the MTPC Forecast, to the Company on a quarterly basis. The MTPC
Forecast reflects MTPC’s needs for vadadustat drug product over a certain number of months, represented as a quantity of vadadustat drug product per
calendar quarter. MTPC makes an up-front payment for a certain percentage of each batch of vadadustat drug product ordered. The term of the MTPC
Supply Agreement extends throughout the term of the MTPC Agreement, and the termination provisions of the MTPC Agreement govern termination of
the MTPC Supply Agreement.

On December 16, 2022, the Company, MTPC, and Esteve Química, S.A., or Esteve, executed an Assignment of Supply Agreement, or the Assignment
Agreement, pursuant to which the Supply Agreement between the Company and Esteve (see Note 15), or the Esteve Agreement, was assigned to MTPC.
The Assignment Agreement transferred the rights and obligations of the Esteve Agreement to MTPC, including the obligations under certain purchase
orders issued by the Company and

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accepted by Esteve. As such, the transferred purchase orders will continue to have a binding effect on MTPC to take delivery of the product from Esteve in
accordance with the terms of the Esteve Agreement. The Company will have no further obligation to take delivery of or pay for product delivered by
Esteve under the transferred purchase orders.

During the years ended December 31, 2022, 2021, and 2020, the Company recognized $16.2 million, $11.6 million, and 0 million, respectively, of revenue
under the MTPC Supply Agreement. As of December 31, 2022, the Company recorded $2.1 million in accounts receivable and $3.7 million in deferred
revenues.

U.S. Collaboration and License Agreement with Otsuka Pharmaceutical Co. Ltd.

Summary of Agreement

On December 18, 2016, the Company entered into a collaboration and license agreement with Otsuka, or the Otsuka U.S. Agreement. The collaboration
was focused on the development and commercialization of vadadustat in the United States. Under the terms of the Otsuka U.S. Agreement, the Company
was responsible for leading the development of vadadustat, for which it submitted an NDA to the FDA in March 2021, and for which it received the CRL
in March 2022. On May 12, 2022, the Company received notice from Otsuka that Otsuka had elected to terminate the Otsuka U.S. Agreement and the
Otsuka International Agreement. On June 30, 2022, the Company and Otsuka entered into the Termination Agreement, pursuant to which, among other
things, the Company and Otsuka agreed to terminate the Otsuka U.S. Agreement and the Otsuka International Agreement as of June 30, 2022.

Under the terms of the Otsuka U.S. Agreement, the Company granted to Otsuka a co-exclusive, non-sublicensable license under certain intellectual
property controlled by the Company solely to perform medical affairs activities and to conduct non-promotional and commercialization activities related to
vadadustat in accordance with the associated plans. The co-exclusive license related to activities that would be jointly conducted by the Company and
Otsuka pursuant to the terms of the Otsuka U.S. Agreement. Additionally, the parties agreed not to promote, market or sell any competing product in the
territory covered by the Otsuka U.S. Agreement.

Revenue Recognition

The Company evaluated the elements of the Otsuka U.S. Agreement in accordance with the provisions of ASC 606 and concluded that the contract
counterparty, Otsuka, was a customer. The Company identified three performance obligations in connection with its obligations under the Otsuka U.S.
Agreement as follows: (i) License and Development Services Combined (License Performance Obligation); (ii) Rights to Future Intellectual Property
(Future IP Performance Obligation) and (iii) Joint Committee Services (Committee Performance Obligation). The Company allocated the transaction price
to each performance obligation based on the Company’s best estimate of the relative standalone selling price. The Company developed a best estimate of
standalone selling price for the Committee Performance Obligation after considering the nature of the services to be performed and estimates of the
associated effort and rates applicable to such services that would be expected to be realized under similar contracts. The Company developed a best
estimate of standalone selling price for the Future IP Performance Obligation primarily based on the likelihood that additional intellectual property covered
by the license conveyed would be developed during the term of the arrangement. The Company did not develop a best estimate of standalone selling price
for the License Performance Obligation due to the following: (i) the best estimates of standalone selling price associated with the Future IP Performance
Obligation was determined to be immaterial and (ii) the period of performance and pattern of recognition for the License Performance Obligation and the
Committee Performance Obligation was determined to be similar.  

The Company re-evaluated the transaction price in each reporting period and as uncertain events were resolved or other changes in circumstances occurred.
The Company determined that under ASC 606, the contract was modified in the second quarter of 2019, when the Company elected to require Otsuka to
increase the aggregate percentage of current global development costs it funds under the Otsuka U.S. Agreement and the Otsuka International Agreement
from 52.5% to 80%, or the Otsuka Funding Option, and the Company became eligible to receive the amount from the Otsuka Funding Option. In
connection with the modification, the Company adjusted the transaction price to include the amount from the Otsuka Funding Option as additional variable
consideration. The Company constrained the variable consideration to an amount for which a significant revenue reversal is not probable.

Pursuant to the Otsuka U.S. Agreement, the Company received: (i) the up-front payment of $125.0 million, (ii) the cost share payment with respect to
amounts incurred by the Company through December 31, 2016 of $33.8 million, and (iii) the net cost share consideration received with respect to amounts
incurred by the Company under the global development plan of approximately $319.2 million with respect to amounts incurred by the Company
subsequent to December 31, 2016.

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Pursuant to the Termination Agreement, in July 2022, the Company received a nonrefundable and non-creditable payment of $55.0 million in consideration
for the covenants and agreements set forth in the Termination Agreement, including the settlement and release of all disputes and claims as provided
therein. The Company determined that the Termination Agreement met the definition of a contract modification and was accounted for as a cumulative
catch-up adjustment at the time of modification under ASC 606.

During the year ended December 31, 2022, the Company recognized $92.3 million of collaboration revenue from the Otsuka U.S. Agreement and the
Otsuka International Agreement combined in its consolidated statement of operations and comprehensive loss. The collaboration revenue for the year
ended December 31, 2022 is primarily comprised of the $55.0 million payment received pursuant to the Termination Agreement, $15.5 million related to
previously deferred revenue as of the date of termination and $9.6 million of non-cash consideration related to Otsuka's obligations to complete certain
agreed upon clinical activities related to the Phase 3b clinical trial of vadadustat Otsuka is conducting. During the years ended December 31, 2021 and
2020, the Company recognized collaboration revenue totaling approximately $36.6 million and $93.4 million, respectively, with respect to the Otsuka U.S.
Agreement.

The Company determined that the medical affairs, commercialization and non-promotional activities elements of the Otsuka U.S. Agreement represented
joint operating activities in which both parties were active participants and of which both parties were exposed to significant risks and rewards that were
dependent on the success of the activities. Accordingly, the Company accounted for the joint medical affairs, commercialization and non-promotional
activities in accordance with ASC No. 808, Collaborative Arrangements (ASC 808). Additionally, the Company determined that in the context of the
medical affairs, commercialization and non-promotional activities, Otsuka did not represent a customer as contemplated by ASC 606-10-15, Revenue from
Contracts with Customers – Scope and Scope Exceptions. As a result, the activities conducted pursuant to the medical affairs, commercialization and non-
promotional activities plans were accounted for as a component of the related expense in the period incurred. During the years ended December 31, 2022,
2021 and 2020, the Company incurred approximately $7.6 million, $17.5 million and $5.1 million, respectively, of costs related to the cost-sharing
provisions of the Otsuka U.S. Agreement of which approximately $3.8 million, $8.6 million and $2.2 million were reimbursable by Otsuka and recorded as
a reduction to research and development expense during each of the years ended December 31, 2022, 2021 and 2020, respectively. During the year ended
December 31, 2022, Otsuka incurred no costs related to the cost-sharing provisions of the Otsuka U.S. Agreement. During the years ended December 31,
2021 and 2020, Otsuka incurred $0.9 million and $2.1 million, respectively, of costs related to the cost-sharing provisions of the Otsuka U.S. Agreement, of
which approximately $0.4 million and $1.1 million were reimbursable by the Company and recorded as an increase to research and development expense
during the years ended December 31, 2021 and 2020, respectively.

International Collaboration and License Agreement with Otsuka Pharmaceutical Co. Ltd.

Summary of Agreement

On April 25, 2017, the Company entered into a collaboration and license agreement with Otsuka, or the Otsuka International Agreement. The collaboration
was focused on the development and commercialization of vadadustat in Europe, Russia, China, Canada, Australia, the Middle East and certain other
territories, collectively, the Otsuka International Territory.

Under the terms of the Otsuka International Agreement, the Company granted to Otsuka an exclusive, sublicensable license under certain intellectual
property controlled by the Company to develop and commercialize vadadustat and products containing or comprising vadadustat in the Otsuka
International Territory. Additionally, under the terms of this agreement, the Company was responsible for leading the development of vadadustat. Otsuka
had the sole responsibility, at its own cost, for the commercialization of vadadustat in the Otsuka International Territory, subject to the approval by the
relevant regulatory authorities.

Revenue Recognition

The Company has accounted for the Otsuka International Agreement separately from the collaboration arrangement with Otsuka with respect to the U.S.
due to the lack of interrelationship and interdependence of the elements and payment terms within each of the contracts as they related to the respective
territories. Accordingly, the Company applied the guidance in ASC 606 solely in reference to the terms and conditions of the Otsuka International
Agreement, while the Otsuka U.S. Agreement continued to be accounted for as a discrete agreement in its own right. The Company evaluated the Otsuka
International Agreement in accordance with the provisions of ASC 606 and concluded that the contract counterparty, Otsuka, was a customer. The
Company identified three performance obligations in connection with its obligations under the Otsuka International Agreement as follows: (i) License and
Development Services Combined (License Performance Obligation); (ii) Rights to Future Intellectual Property (Future IP Performance Obligation) and (iii)
Joint Committee Services (Committee Performance Obligation). The Company allocated the transaction price to each performance obligation based on the
Company’s

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best estimate of the relative standalone selling price. The Company developed a best estimate of standalone selling price for the Committee Performance
Obligation after considering the nature of the services to be performed and estimates of the associated effort and rates applicable to such services that
would be expected to be realized under similar contracts. The Company developed a best estimate of standalone selling price for the Future IP Performance
Obligation primarily based on the likelihood that additional intellectual property covered by the license conveyed will be developed during the term of the
arrangement. The Company did not develop a best estimate of standalone selling price for the License Performance Obligation due to the following: (i) the
best estimates of standalone selling price associated with the Future IP Performance Obligation was determined to be immaterial and (ii) the period of
performance and pattern of recognition for the License Performance Obligation and the Committee Performance Obligation was determined to be similar. 

The Company re-evaluated the transaction price in each reporting period and as uncertain events were resolved or other changes in circumstances occurred.
Pursuant to the Otsuka International Agreement, the Company received: (i) the up-front payment of $73.0 million, (ii) the cost share payment with respect
to amounts incurred by the Company during the quarter ended March 31, 2017 of $0.2 million, and (iii) the net cost share consideration received with
respect to amounts incurred by the Company subsequent to March 31, 2017 of $216.7 million.

As discussed above, the Otsuka International Agreement was terminated on June 30, 2022 pursuant to the Termination Agreement. Refer to earlier in this
Note 4 for further details of the recognition of this Termination Agreement in the Company's consolidated statement of operations and comprehensive loss.

During the years ended December 31, 2021 and 2020, the Company recognized revenue totaling approximately $16.4 million and $45.5 million,
respectively, with respect to the Otsuka International Agreement. The revenue is classified as collaboration revenue in the accompanying consolidated
statements of operations. As of December 31, 2021, there was approximately $0.9 million in contract liabilities (included in accounts payable) and $1.3
million in prepaid expenses and other current assets in the consolidated balance sheet.

Janssen Pharmaceutica NV Research and License Agreement

Summary of Agreement

On February 9, 2017, the Company entered into a Research and License Agreement, the Janssen Agreement, with Janssen Pharmaceutica NV, or Janssen, a
subsidiary of Johnson & Johnson, pursuant to which Janssen granted the Company an exclusive license under certain intellectual property rights to develop
and commercialize worldwide certain HIF prolyl hydroxylase targeted compounds.

Under the terms of the Janssen Agreement, the Company made an upfront payment of $1.0 million in cash to Janssen and issued a warrant to purchase
509,611 shares of the Company’s common stock, which expired on February 9, 2022. On August 1, 2022, the Company notified Janssen that it was
exercising its right to terminate the Janssen Agreement in its entirety, and Janssen agreed to the termination which became effective on August 2, 2022.

Cyclerion Therapeutics License Agreement

Summary of Agreement

On June 4, 2021, the Company entered into a License Agreement, the Cyclerion Agreement, with Cyclerion Therapeutics Inc., or Cyclerion, pursuant to
which Cyclerion granted the Company an exclusive global license under certain intellectual property rights to research, develop and commercialize
praliciguat, an investigational oral soluble guanylate cyclase stimulator.

Under the terms of the Cyclerion Agreement, the Company made an upfront payment of $3.0 million in cash to Cyclerion, which was paid during the
second quarter of 2021. Substantially all of the fair value of the assets acquired in conjunction with the Cyclerion Agreement was concentrated in the
acquired license. As a result, the Company accounted for this transaction as an asset acquisition under ASU No. 2017-01, Business Combinations (Topic
805): Clarifying the Definition of a Business. The upfront payment was charged to expense at acquisition, as it relates to a development stage compound
with no alternative future use.

In addition, Cyclerion is eligible to receive up to an aggregate of $222.0 million from the Company in specified development and regulatory milestone
payments on a product-by-product basis. Cyclerion will also be eligible to receive specified commercial milestones as well as tiered royalties ranging from
a low-single-digit to mid-double-digit percentage of net sales, on a product-by-product basis, and subject to reduction upon expiration of patent rights or
the launch of a generic product in the

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territory. The Company recorded the upfront payment in the amount of $3.0 million to research and development expense in June 2021.

Unless earlier terminated, the Cyclerion Agreement will expire on a product-by-product and country-by-country basis upon the expiration of the last
royalty term, which ends upon the longest of (i) the expiration of the patents licensed under the Cyclerion Agreement, (ii) the expiration of regulatory
exclusivity for such product, and (iii) 10 years from first commercial sale of such product. The Company may terminate the Cyclerion Agreement in its
entirety or only with respect to a particular licensed compound or product upon 180 days' prior written notice to Cyclerion. The parties also have customary
termination rights, subject to a cure period, in the event of the other party’s material breach of the Cyclerion Agreement or in the event of certain additional
circumstances.

CSL Vifor License Agreement

Summary of Agreement

On May 12, 2017, the Company entered into a License Agreement, or the Vifor Agreement, with Vifor (International) Ltd. (now a part of CSL Limited), or
CSL Vifor, pursuant to which the Company granted CSL Vifor an exclusive license to sell vadadustat solely to Fresenius Kidney Care Group LLC, an
affiliate of Fresenius Medical Care North America, or FMCNA, in the United States. On April 8, 2019, the Company and CSL Vifor entered into an
Amended and Restated License Agreement, or the Vifor First Amended Agreement, which amended and restated in full the Vifor Agreement. On February
18, 2022, the Company and CSL Vifor entered into a Second Amended and Restated License Agreement, or the Vifor Second Amended Agreement, which
amends and restates the Vifor First Amended Agreement.

Pursuant to the Vifor Second Amended Agreement, the Company granted CSL Vifor an exclusive license to sell vadadustat to FMCNA and its affiliates,
including Fresenius Kidney Care Group LLC, to certain third party dialysis organizations approved by the Company, to independent dialysis organizations
that are members of certain group purchasing organizations, and to certain non-retail specialty pharmacies, or collectively, the Supply Group, in the United
States, or the Territory. Pursuant to the Vifor Second Amended Agreement, CSL Vifor agreed that it would not sell or otherwise supply vadadustat until the
FDA has granted regulatory approval for vadadustat for the treatment of anemia due to CKD in adult patients with DD-CKD in the Territory and until CSL
Vifor has entered a supply agreement with the applicable member of the Supply Group.

Similar to the Vifor First Amended Agreement, the Vifor Second Amended Agreement is structured as a profit share arrangement between the Company
and CSL Vifor in which the Company will receive approximately 66% of the profit, net of certain pre-specified costs. Under the Vifor Second Amended
Agreement, in February 2022, CSL Vifor made an upfront payment to the Company of $25.0 million in lieu of the previously disclosed milestone payment
of $25.0 million that CSL Vifor was to pay the Company following approval of vadadustat by the FDA, as established under the Vifor First Amended
Agreement.

Unless earlier terminated, the Vifor Second Amended Agreement will expire upon the later of the expiration of all patents that claim or cover vadadustat or
expiration of marketing or regulatory exclusivity for vadadustat in the Territory. CSL Vifor may terminate the Vifor Second Amended Agreement in its
entirety upon 30 months' prior written notice after the first anniversary of the receipt of regulatory approval, if approved, from the FDA for vadadustat for
dialysis-dependent CKD patients. The Company may terminate the Vifor Second Amended Agreement in its entirety for convenience, following the earlier
of a certain period of time elapsing or following certain specified regulatory events, and upon six months’ prior written notice. If the Company so
terminates for convenience, subject to specified exceptions, the Company will pay a termination fee to CSL Vifor. In addition, either party may, subject to a
cure period, terminate the Vifor Second Amended Agreement in the event of the other party’s uncured material breach or bankruptcy.

Investment Agreement

In connection with the Vifor Agreement, in May 2017, the Company and CSL Vifor entered into an investment agreement, or the First Investment
Agreement, pursuant to which the Company sold an aggregate of 3,571,429 shares of the Company’s common stock, or the 2017 Shares, to CSL Vifor at a
price per share of $14.00 for a total of $50.0 million. The amount representing the premium over the closing stock price of $12.69 on the date of the
transaction, totaling $4.7 million, was determined by the Company to represent consideration related to the Vifor Agreement. 

CSL Vifor agreed to a lock-up restriction such that it agreed not to sell the 2017 Shares for a period of time following the effective date of the First
Investment Agreement as well as a customary standstill agreement. The lock-up restriction in place as part of the First Investment Agreement has since
expired. In addition, the First Investment Agreement contains voting agreements made by CSL Vifor with respect to the 2017 Shares. The 2017 Shares
have not been registered pursuant to the

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Securities Act of 1933, as amended, or the Securities Act, and were issued and sold in reliance upon the exemption from registration contained in Section
4(a)(2) of the Securities Act and Rule 506 promulgated thereunder.

In connection with entering into the Vifor Second Amended Agreement, on February 18, 2022, the Company and CSL Vifor entered into an investment
agreement, or the Second Investment Agreement, pursuant to which the Company sold an aggregate of 4,000,000 shares of its common stock, or the 2022
Shares, to CSL Vifor for a total of $20.0 million on February 22, 2022. The amount representing the premium over the grant date fair value on the date of
the transaction, $13.6 million, was determined by the Company to represent the consideration related to the Vifor Second Amended Agreement. CSL Vifor
has  agreed  to  a  lock-up  restriction  to  not  sell  or  otherwise  dispose  of  the  2022  Shares  for  a  period  of  time  following  the  effective  date  of  the  Second
Investment Agreement as well as a customary standstill agreement. In addition, the Second Investment Agreement contains voting agreements made by
CSL Vifor with respect to the 2022 Shares. The 2022 Shares have not been registered pursuant to the Securities Act and were issued and sold in reliance
upon the exemption from registration contained in Section 4(a)(2) of the Securities Act and/or Rule 506 promulgated thereunder, as the transaction did not
involve any public offering within the meaning of Section 4(a)(2) of the Securities Act.

Revenue Recognition

The Company evaluated the elements of the Vifor Second Amended Agreement in accordance with the provisions of ASC 606 and concluded that the
contract counterparty, CSL Vifor, is a customer. The Company’s arrangement with CSL Vifor contains one material promise under the contract at inception,
which is the non-sublicensable, non-transferrable license under certain of the Company’s intellectual property to (i) sell vadadustat solely to the Supply
Group, (ii) sell vadadustat to Designated Wholesalers solely for resale to members of the Supply Group, (iii) conduct medical affairs with respect to
vadadustat in the Territory in the field during the term of the Vifor Second Amended Agreement and (iv) use the Akebia Trademark solely in connection
with the sale of vadadustat (the License Deliverable).

The Company has identified one performance obligation in connection with its obligations under the Vifor Second Amended Agreement, which is the
License Deliverable, or License Performance Obligation. The transaction price at inception was comprised of: (i) the up-front payment of $25.0 million, (ii)
the premium paid by CSL Vifor on the First Investment Agreement of $4.7 million, and (iii) the premium paid by CSL Vifor on the Second Investment
Agreement of $13.6 million. Pursuant to the terms of the Vifor Second Amended Agreement, these payments from CSL Vifor are non-refundable and non-
creditable against any other amount due to the Company. Also pursuant to the Vifor Second Amended Agreement, if the Centers for Medicare & Medicaid
Services, or CMS, determines that vadadustat is excluded from the Transitional Drug Add-on Payment Adjustment, or TDAPA, the Company can terminate
the Vifor Second Amended Agreement and will be required to repay the up-front payment and the premiums paid by CSL Vifor in the First Investment
Agreement and Second Investment Agreement, respectively. The Company considered whether the transaction price was constrained as required per the
guidance in ASC 606-10-32-11. As part of its evaluation of the constraint, the Company considered numerous factors, including the CRL received from the
FDA for vadadustat, the uncertainty associated with a potential future approval of vadadustat by the FDA, and if approval of vadadustat is received in the
future, whether vadadustat would be included in certain reimbursement bundles by CMS, which are all outside of the Company’s control. CSL Vifor also
agreed that it will not sell or otherwise supply vadadustat until the FDA has granted regulatory approval for vadadustat in the DD-CKD Indication. The
Company constrains the variable consideration to an amount for which a significant revenue reversal is not probable. Therefore, the Company determined
that the entire transaction price at inception was constrained under ASC 606, and the Company has recorded the transaction price to deferred revenue as of
December 31, 2022.

Refund Liability to Customer

Pursuant to the Vifor Second Amended Agreement, CSL Vifor contributed $40.0 million to a working capital fund established to partially fund the
Company’s costs of purchasing vadadustat from its contract manufacturers, or the Working Capital Fund, which amount of funding will fluctuate, and
which funding the Company is required to repay to CSL Vifor over time. The $40 million initial contribution to the Working Capital Fund represented 50%
of the amount of purchase orders that the Company had placed with its contract manufacturers for the supply of vadadustat for the Territory already
delivered as of the effective date of the Vifor Second Amended Agreement, and to be delivered through the end of 2023. The amount of the Working
Capital Fund will be reviewed at specified intervals and is adjusted based on a number of factors including outstanding supply commitments for vadadustat
for the Territory and agreed upon vadadustat inventory levels held by the Company for the Territory. Upon termination or expiration of the Vifor Second
Amended Agreement for any reason other than convenience by CSL Vifor (including following receipt of the CRL for vadadustat), the Company will be
required to refund the outstanding balance of the Working Capital Fund on the date of termination or expiration.

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The Company has recorded the Working Capital Fund as a refund liability under ASC 606. The Company has determined that the refund liability itself
does not represent an obligation to transfer goods or services to CSL Vifor in the future. The Company has therefore determined that this refund liability is
not a contract liability under ASC 606. The Company accounted for the refund liability as a debt arrangement with zero coupon interest. The Company
imputed interest on the refund liability to the customer at a rate of 15.0% per annum, which was determined based on certain factors, including the
Company's credit rating, comparable securities yield, and the expected repayment period of the Working Capital Fund. The Company recorded an initial
discount on the refund liability to the customer and a corresponding deferred gain to the refund liability to customer on the consolidated balance sheet as of
the date the funds were received from CSL Vifor, which was March 18, 2022. The discount on the note payable is being amortized to interest expense using
the effective interest method over the expected term of the refund liability. The deferred gain is being amortized to interest income on a straight-line basis
over the expected term of the refund liability. The amortization of the discount was $3.4 million for the year ended December 31, 2022. The amortization of
the deferred gain was $2.4 million for the year ended December 31, 2022. The $41.0 million total refund liability is classified as a long-term refund liability
based on management's estimate of potential amounts that could be refundable exceeding a one-year period.

Priority Review Voucher Letter Agreement

On February 14, 2020, the Company entered into a letter agreement, or the Letter Agreement, with CSL Vifor relating to CSL Vifor’s agreement with a
third party to purchase a Priority Review Voucher, or the PRV, issued by the FDA, subject to satisfaction of customary closing conditions, or the PRV
Purchase. Pursuant to the Letter Agreement, Akebia paid CSL Vifor $10.0 million in connection with the closing of the PRV Purchase. The $10.0 million
payment to CSL Vifor was recorded to research and development expense in the consolidated statement of operations and as an operating cash outflow in
the unaudited consolidated statement of cash flows during 2020. In March 2021, the Company submitted an NDA for the treatment of anemia due to CKD
in both DD-CKD and NDD-CKD adult patients. The Company's NDA submission did not include a PRV.

On August 21, 2021, the Company and CSL Vifor executed an amendment to the Letter Agreement whereby the parties agreed that CSL Vifor would sell
the PRV to a third party, and the Company and CSL Vifor would share the proceeds from the sale based on certain terms. In the fourth quarter of 2021,
CSL Vifor sold the PRV to a third party, and CSL Vifor paid the Company $8.6 million in proceeds from the sale, which was recorded as contra research
and development expense. These proceeds were subsequently paid to Otsuka as reimbursement for their contribution to the purchase of the PRV, as
required under a separate letter agreement executed with Otsuka.

License Agreement with Panion & BF Biotech, Inc.

The Company had a license agreement, which was amended from time to time, with Panion & BF Biotech, Inc., or Panion, under which Keryx, the
Company’s wholly owned subsidiary, was the contracting party, or the Panion License Agreement, pursuant to which Keryx in-licensed the exclusive
worldwide rights, excluding certain Asian-Pacific countries, or the Licensor Territory, for the development and commercialization of ferric citrate.

On April 17, 2019, the Company and Panion entered into a second amended and restated license agreement, or the Panion Amended License Agreement,
which amends and restates in full the Panion License Agreement. The Panion Amended License Agreement provides Keryx with an exclusive license under
Panion-owned know-how and patents covering the rights to sublicense, develop, make, use, sell, offer for sale, import and export ferric citrate worldwide,
excluding the Licensor Territory. The Panion Amended License Agreement also provides Panion with an exclusive license under Keryx-owned patents
covering the rights to sublicense (with the Company’s written consent), develop, make, use, sell, offer for sale, import and export ferric citrate in certain
countries in the Licensor Territory. Under the Panion Amended License Agreement, Panion is eligible to receive from the Company or any sublicensee
royalty payments based on a mid-single digit percentage of sales of ferric citrate in the Company’s licensed territories. The Company is eligible to receive
from Panion or any sublicensee royalty payments based on a mid-single digit percentage of net sales of ferric citrate in Panion’s licensed territories.

The Panion Amended License Agreement terminates upon the expiration of each of the Company’s and Panion’s obligations to pay royalties thereunder. In
addition, the Company may terminate the Panion Amended License Agreement (i) in its entirety or (ii) with respect to one or more countries in the
Company’s licensed territory, in either case upon 90 days’ notice. The Company and Panion also each have the right to terminate the Panion Amended
License Agreement upon the occurrence of a material breach of the Panion Amended License Agreement by the other party, subject to certain cure
provisions, or certain insolvency events. The Panion Amended License Agreement also provides that, on a country-by-country basis, until the second
anniversary of the expiration of the obligation of the Company or Panion, as applicable, to pay royalties in a country in which such party has ferric citrate
for sale on the date of such expiration, neither the other party nor its affiliates will, directly or

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indirectly, sell, distribute or otherwise commercialize or supply or cause to supply ferric citrate to a third party for sale or distribution in such country.

The Panion Amended License Agreement includes customary terms relating to, among others, indemnification, confidentiality, remedies, and
representations and warranties. In addition, the Panion Amended License Agreement provides that each of the Company and Panion has the right, but not
the obligation, to conduct litigation against any infringer of certain patent rights under the Panion Amended License Agreement in certain territories.

During the years ended December 31, 2022, 2021 and 2020, the Company incurred approximately $13.8 million, $11.8 million and $11.2 million,
respectively, in royalty payments due to Panion relating to the Company’s sales of Auryxia in the United States and JT and Torii’s net sales of Riona in
Japan.

Sublicense Agreement with Japan Tobacco, Inc. and its subsidiary, Torii Pharmaceutical Co., Ltd.

Summary of Agreement

The Company has an Amended and Restated Sublicense Agreement, which was amended in June 2013, with JT and Torii, or the JT and Torii Sublicense
Agreement, under which Keryx, the Company’s wholly owned subsidiary, remains the contracting party. Under the JT and Torii Sublicense Agreement, JT
and Torii obtained the exclusive sublicense rights for the development and commercialization of ferric citrate hydrate in Japan. JT and Torii are responsible
for the future development and commercialization costs in Japan.

In January 2014, JT and Torii received manufacturing and marketing approval of ferric citrate from the Japanese Ministry of Health, Labour and Welfare.
Ferric citrate hydrate, which launched in May 2014 and is being marketed in Japan by Torii under the brand name Riona, is indicated as an oral treatment
for the improvement of hyperphosphatemia in patients with CKD, including NDD-CKD and DD-CKD. In July 2019, JT and Torii, reported positive top-
line results from a pivotal Phase 3 comparative study evaluating Riona for the treatment of IDA in adult patients in Japan, which was approved in March
2021. In May 2020, JT and Torii filed an application for approval of IDA as an additional indication for Riona in Japan. The Company is eligible to receive
royalty payments based on a tiered low double-digit percentage of net sales of Riona in Japan inclusive of amounts that the Company must pay to Panion
on JT and Torii's net sales of Riona under the Panion License Agreement subject to certain reductions upon expiration or termination of the Amended and
Restated License Agreement between Keryx and Panion, pursuant to which Keryx in-licensed the exclusive worldwide rights, excluding certain Asian-
Pacific countries, for the development and commercialization of ferric citrate. The Company is entitled to receive up to an additional $55.0 million upon
the achievement of certain annual net sales milestones.

The sublicense under the JT and Torii Sublicense Agreement terminates upon the expiration of all underlying patent rights. Also, JT and Torii may
terminate the JT and Torii Sublicense Agreement with or without cause upon at least six months' prior written notice to the Company. Additionally, either
party may terminate the JT and Torii Sublicense Agreement for cause upon 60 days’ prior written notice after the breach of any uncured material provision
of the JT and Torii Sublicense Agreement, or after certain insolvency events.

Revenue Recognition

The Company evaluated the elements of the JT and Torii Sublicense Agreement in accordance with the provisions of ASC 606 and concluded that the
contract counterparty, JT and Torii, is a customer. The Company’s arrangement with JT and Torii contains the following material promises under the
contract at inception: (i) exclusive license to develop and commercialize ferric citrate hydrate in Japan (the License Deliverable), (ii) supply of ferric citrate
hydrate until JT and Torii could secure their own source (the Supply Deliverable), (iii) knowledge transfer, and (iv) rights to future know-how.

The Company identified two performance obligations in connection with its obligations under the JT and Torii Sublicense Agreement: (i) License and
Supply Performance Obligation and (ii) Rights to Future Know-How Performance Obligation. The Company allocated the transaction price to each
performance obligation based on the Company’s best estimate of the relative standalone selling price. The Company developed a best estimate of the
standalone selling price for the Rights to Future Know-How Performance Obligation primarily based on the likelihood that additional intellectual property
covered by the license conveyed will be developed during the term of the arrangement and determined it immaterial. As such, the Company did not develop
a best estimate of standalone selling price for the License and Supply Performance Obligation and allocated the entire transaction price to this performance
obligation. Additionally, as of the consummation of the Merger, the services associated with the License and Supply Performance Obligation were
completed and JT and Torii had secured their own source to manufacture ferric citrate hydrate. As such, any initial license fees as well as any development-
based milestones and manufacturing fee revenue were received and recognized prior to the Merger. The Company determined that the remaining

149

consideration that may be payable to the Company under the terms of the sublicense agreement are either quarterly royalties on net sales or payments due
upon the achievement of sales-based milestones. In accordance with ASC 606, the Company recognizes sales-based royalties and milestone payments
based on the level of sales, when the related sales occur as these amounts have been determined to relate predominantly to the license granted to JT and
Torii and therefore are recognized at the later of when the performance obligation is satisfied, or the related sales occur.

During the years ended December 31, 2022, 2021 and 2020, the Company recognized $5.3 million, $5.8 million and $5.7 million, respectively, in license
revenue related to royalties earned on net sales of Riona in Japan. The Company records the associated mid-single digit percentage of net sales royalty
expense due to Panion, the licensor of Riona, in the same period as the royalty revenue from JT and Torii is recorded.

License Agreement with Averoa SAS

Summary of Agreement

On December 22, 2022, the Company and Averoa SAS, or Averoa, entered into a license agreement, or the Averoa License Agreement, pursuant to which
the Company granted to Averoa an exclusive license to develop and commercialize ferric citrate, or the Licensed Product, in the European Economic Area,
Turkey, Switzerland and the United Kingdom, or the Territory.

Under the Averoa License Agreement, the Company is entitled to receive tiered, escalating royalties ranging from a mid-single digit percentage to a low
double-digit percentage of Averoa's annual net sales in the Territory, including certain minimum royalty amounts in certain years, and subject to reduction
in certain circumstances. The royalties will expire on a country-by-country basis upon the last to occur of (a) 10 years following the date of first
commercial sale of the Licensed Product in such country; (b) expiration of the last valid claim of Company patent rights and joint patent rights in such
country; and (c) the date of expiration of the data, regulatory, or marketing exclusivity period conferred by the applicable regulatory authority in such
country with respect to the Licensed Product.

The Company and Averoa will establish a joint steering committee to oversee the development, manufacturing and commercialization of the Licensed
Product in the Territory.

The Averoa License Agreement expires on the date of expiration of all royalty obligations due thereunder with respect to the Licensed Product on a
country-by-country basis in the Territory, unless earlier terminated in accordance with the agreement. Either party may, subject to a cure period, terminate
the Averoa License Agreement in the event of the other party’s uncured material breach. Averoa has the right to terminate the Averoa License Agreement
for convenience upon 12 months’ prior written notice delivered on or after the date that is 12 months after the effective date. In addition, Averoa has the
right to terminate the Averoa License Agreement upon 30 days’ notice if the EMA rejects Averoa’s marketing authorization application for the Licensed
Product, and the parties in good faith agree that submitting a new marketing authorization application to the EMA will not result in approval. The Averoa
License Agreement includes customary terms relating to, among others, indemnification, confidentiality, remedies, and representations and warranties.

The Averoa License Agreement provides that the Company and Averoa will enter into a supply agreement pursuant to which the Company will supply the
Licensed Product to Averoa for commercial use in the Territory. The Company will have the right to terminate the supply agreement upon 24 months'
notice, which may be provided on or after January 1, 2024. The Company did not receive any consideration under this agreement as of December 31, 2022.

5. Restructuring and Other Charges, Net

On April 4, 2022, the Board of Directors of the Company approved a reduction of the Company’s workforce by approximately 42% across all areas of the
Company (47% inclusive of the closing of the majority of open positions) following the receipt of the CRL from the FDA to the Company’s NDA for
vadadustat for the treatment of anemia due to CKD in adult patients. On May 5, 2022, the Company implemented a further reduction in workforce
consisting of several members of management. These actions reflected the Company’s determination to refocus its strategic priorities around its
commercial product, Auryxia , and its development portfolio, and are steps in a cost savings plan to significantly reduce the Company’s expense profile.

®

The workforce reductions were completed as of December 31, 2022, and the Company has incurred all related charges. During the year ended
December 31, 2022, the Company recognized $14.5 million of restructuring charges in the consolidated statement of operations. These charges included
$11.3 million of one-time termination benefits and contractual termination benefits for severance, healthcare, and related benefits and $3.2 million of non-
cash share-based compensation expense. The

150

charges were recorded pursuant to ASC 712, Compensation-Nonretirement Postemployment Benefits or ASC 420, Exit or Disposal Cost Obligations,
depending on the employee.

On November 7, 2022, the Board of Directors approved a reduction of the Company’s workforce by approximately 14% consisting solely of individuals
within the commercial organization as a result of the Company’s decision to shift to a strategic account management focused model for its commercial
efforts. This shift in approach supports the Company’s strategic pillars to drive Auryxia revenue while also continuing to decrease operating costs.

The workforce reduction was completed as of December 31, 2022, and the Company has incurred all related charges. During the year ended December 31,
2022, the Company recognized $1.4 million of restructuring charges in the consolidated statement of operations. These charges included one-time
termination benefits and contractual termination benefits for severance, healthcare, and related benefits and non-cash share-based compensation expense.
The charges were recorded pursuant to ASC 712, Compensation-Nonretirement Postemployment Benefits or ASC 420, Exit or Disposal Cost Obligations,
depending on the employee.

Details of the restructuring liability activity for the Company's workforce reductions for the period ended December 31, 2022 as recorded in accrued
expenses and other current liabilities and other non-current liabilities in the consolidated balance sheet on this Form 10-K are as follows:

Balance at December 31, 2021
Restructuring charges
Stock-based compensation expense
Severance payments and adjustments

Balance at December 31, 2022

6. Liability Related to Sale of Future Royalties

December 31, 2022
(in thousands)

$

$

— 
15,933 
(3,197)
(8,977)
3,758 

On February 25, 2021, the Company entered into the Royalty Agreement with HealthCare Royalty Partners IV, L.P., or HCR, pursuant to which the
Company sold to HCR its right to receive royalties and sales milestones for vadadustat in Japan and certain other Asian countries, such countries,
collectively, the MTPC Territory, and such payments collectively the Royalty Interest Payments, in each case, payable to the Company under the MTPC
Agreement, subject to an annual maximum “cap” of $13.0 million, or the Annual Cap, and an aggregate maximum “cap” of $150.0 million, or the
Aggregate Cap. After HCR receives Royalty Interest Payments equal to the Annual Cap in a given calendar year, the Company will receive 85% of the
Royalty Interest Payments for the remainder of that year. After HCR receives Royalty Interest Payments equal to the Aggregate Cap, or the Company pays
the Aggregate Cap to HCR (net of the Royalty Interest Payments already received by HCR), the Royalty Interest Payments will revert back to the
Company, and HCR would have no further right to any Royalty Interest Payments. The Company received $44.8 million from HCR (net of certain
transaction expenses) under the Royalty Agreement, and the Company is eligible to receive an additional $5.0 million in each year from 2021 through 2023
under the Royalty Agreement if specified annual sales milestones are achieved for vadadustat in the MTPC Territory, subject to the satisfaction of certain
customary conditions. The sales milestone for vadadustat in the MTPC Territory was not achieved for 2022 or 2021. The Company retains the right to
receive all potential future regulatory milestones for vadadustat under the MTPC Agreement. The Royalty Agreement will terminate on the earlier of the
date on which HCR has received (i) the last Royalty Interest Payment or (ii) payment by the Company of an amount equal to the Aggregate Cap minus the
aggregate amount of all Royalty Interest Payments actually received by HCR.

Although the Company sold its right to receive royalties and sales milestones for vadadustat in the MTPC Territory as described above, as a result of its
ongoing involvement in the cash flows related to these royalties, the Company will continue to account for these royalties as revenue. The Company
recognized the proceeds received from HCR as a liability that is being amortized using the effective interest method over the life of the arrangement. At the
transaction date, the Company recorded the net proceeds of $44.8 million as a liability. In order to determine the amortization of the liability, the Company
is required to estimate the total amount of future net royalty payments to be made to HCR over the term of the Royalty Agreement. The total threshold of
net royalties to be paid, less the net proceeds received, will be recorded as interest expense over the life of the liability. The Company imputes interest on
the unamortized portion of the liability using the effective interest method. The annual effective interest rate as of December 31, 2022 was 0% which is
reflected as interest expense in the consolidated

151

statements of operations and comprehensive loss. Over the course of the Royalty Agreement, the actual interest rate will be affected by the amount and
timing of royalty revenue recognized and changes in forecasted royalty revenue. There are a number of factors that could materially affect the amount and
timing of royalty payments from MTPC, none of which are within the Company's control. On a quarterly basis, the Company reassesses the effective
interest rate and adjusts the rate prospectively as needed.

The following table shows the activity within the liability account for the year ended December 31, 2022:

Liability related to sale of future royalties, net — beginning balance

MTPC royalties payable
Non-cash interest expense recognized

Liability related to sale of future royalties, net — ending balance

December 31, 2022
(in thousands)

$

$

53,079 
(1,777)
6,182 
57,484 

The Royalty Agreement requires the Company to take certain actions, including actions with respect to the Royalty Interest Payments, the MTPC
Agreement, the MTPC Supply Agreement, and the Company's intellectual property. The Royalty Agreement also contains certain representations and
warranties, covenants, indemnification obligations, events of default and other provisions that are customary for a royalty monetization transaction of this
nature. In addition, the Company granted HCR a precautionary security interest in connection with the Royalty Interest Payments.

7. Fair Value of Financial Instruments

The Company utilizes a portfolio management company for the valuation of the majority of its investments. This company is an independent, third-party
vendor recognized to be an industry leader with access to market information that obtains or computes fair market values from quoted market prices,
pricing for similar securities, recently executed transactions, cash flow models with yield curves and other pricing models. For valuations obtained from the
pricing service, the Company performs due diligence to understand how the valuation was calculated or derived, focusing on the valuation technique used
and the nature of the inputs.

Based on the fair value hierarchy, the Company classifies its cash equivalents and available for sale securities within Level 1 or Level 2. This is because the
Company values its cash equivalents and available for sale securities using quoted market prices or alternative pricing sources and models utilizing market
observable inputs.

Assets measured or disclosed at fair value on a recurring basis as of December 31, 2022 and 2021 are summarized below:

December 31, 2022
Assets:

Cash and cash equivalents

Liabilities:

Derivative liability

Level 1

Level 2

Level 3

Total

Fair Value Measurements Using

(in thousands)

$
$

$

90,466 
90,466  $

—
—  $

—
—  $

— $
—  $

— $
—  $

90,466 
90,466 

760  $
760  $

760 
760 

152

 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2021
Assets:

Cash and cash equivalents

Liabilities:

Derivative liability

Level 1

Level 2

Level 3

Total

Fair Value Measurements Using

(in thousands)

$
$

$

149,800 
149,800  $

—
—  $

—
—  $

— $
—  $

— $
—  $

149,800 
149,800 

1,820  $
1,820  $

1,820 
1,820 

The Company’s Loan Agreement with Pharmakon (see Note 11) contains certain provisions that change the underlying cash flows of the debt instrument,
including a potential extension to the interest-only period dependent on both (i) no event of default having occurred and continuing and (ii) the Company
achieving certain regulatory and revenue conditions. One of the regulatory conditions was approval of vadadustat by August 2022, however, in March
2022, the Company received the CRL from the FDA stating that the FDA had determined that it could not approve the NDA for vadadustat in its present
form. Therefore, the Company is no longer eligible for the interest-only extension period and this no longer changes the underlying cash flows of the debt
instrument. The Company also assessed the acceleration of the obligations under the Loan Agreement under certain events of default. In addition, under
certain circumstances, a default interest rate will apply on all outstanding obligations during the occurrence and continuance of an event of default. In
accordance with ASC 815, the Company concluded that these features are not clearly and closely related to the host instrument, and represent a single
compound derivative that is required to be re-measured at fair value on a quarterly basis.

The potential events of default include maintaining, on an annual basis, a minimum liquidity threshold which started in 2021, and on a quarterly basis, a
minimum net sales threshold for Auryxia which started in the fourth quarter of 2020. The Company recorded a derivative liability related to the Company’s
Loan Agreement with Pharmakon of $0.8 million and $1.8 million as of December 31, 2022 and 2021, respectively. The Company classified the derivative
liability as a non-current liability on the balance sheet at December 31, 2022 and 2021. The estimated fair value of the derivative liability on both
December 31, 2022 and 2021 was determined using a scenario-based approach and discounted cash flow model that includes principal and interest
payments under various scenarios involving clinical development success for vadadustat and various cash flow assumptions. The Company used a 0%
probability of clinical development success due to receipt of the CRL from the FDA for vadadustat. Should the Company’s assessment of the probabilities
around these scenarios change, including for changes in market conditions, there could be a change to the fair value of the derivative liability.

The following table provides a roll-forward of the fair value of the derivative liability (in thousands):

Balance at December 31, 2021
Change in fair value of derivative liability, recorded as other income

Balance at December 31, 2022

$

$

1,820 
(1,060)
760 

The Company had no other assets or liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) at December 31,
2022 and 2021.

8. Inventory

The components of inventory are summarized as follows:

Raw materials
Work in process
Finished goods

Total inventory

153

December 31, 2022

December 31, 2021

$

$

(in thousands)
610  $

8,086 
13,676 
22,372  $

1,763 
62,635 
14,661 
79,059 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term inventory, which primarily consists of raw materials and work in process, is included in other assets in the Company’s consolidated balance
sheets.

Balance Sheet Classification:
Inventory
Other assets

Total inventory

December 31, 2022

December 31, 2021

(in thousands)

$

$

21,762  $
610 
22,372  $

38,195 
40,864 
79,059 

Inventory amounts written down as a result of excess, obsolescence, scrap or other reasons and charged to cost of goods sold totaled $30.2 million, $15.6
million, and $20.1 million during the years ended December 31, 2022, 2021, and 2020, respectively. The increase in inventory amounts written down for
the year ended December 31, 2022 as compared to the year ended December 31, 2021 was primarily due to higher write-downs to inventory reserves
related to Auryxia drug substance that will not be forward processed into drug product. In addition, there were $0 million, $8.7 million, and $11.4 million
in related step-up charges during the years ended December 31, 2022, 2021, and 2020, respectively.

If future sales of Auryxia are lower than expected, the Company may be required to write-down the value of such inventories. Inventory write-downs and
losses on purchase commitments are recorded as a component of cost of sales in the consolidated statement of operations.

9. Intangible Assets and Goodwill

Intangible Assets

The following table presents the Company’s intangible assets (in thousands):

Acquired intangible assets:

Developed product rights for Auryxia

Total

Acquired intangible assets:

Developed product rights for Auryxia

Total

Gross
Carrying
Value

213,603 
213,603 

Gross
Carrying
Value

213,603 
213,603 

$
$

$
$

December 31, 2022

Accumulated
Amortization

(141,519)
(141,519)

December 31, 2021

Accumulated
Amortization

(105,476)
(105,476)

$
$

$
$

$
$

$
$

Total

72,084 
72,084 

Total

108,127 
108,127 

The Company amortizes its definite-lived intangible assets using the straight-line method, which is considered the best estimate of economic benefit, over
its estimated useful life of six years. The Company recorded $36.0 million in amortization expense during the years ended December 31, 2022 and 2021,
and $31.5 million in amortization expense during the year ended December 31, 2020 related to the developed product rights for Auryxia. Estimated future
amortization expense for the intangible asset as of December 31, 2022 is as follows (in thousands):

2023
2024

Auryxia Intangible Asset Impairment

154

$

$

Total

36,042 
36,042 
72,084 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
In the second quarter of 2020, in connection with a routine business review, the Company reduced its short-term and long-term Auryxia revenue forecast.
This reduction was primarily driven by the compounding impact of the September 2018 CMS decision that rescinded Medicare Part D coverage of Auryxia
for the IDA Indication and the related imposition by CMS of a prior authorization requirement for Auryxia for the Hyperphosphatemia Indication. As a
result, the Company determined indicators of impairment existed for the developed product rights for Auryxia and performed an undiscounted cash flow
analysis pursuant to ASC 360-10, Impairment or Disposal of Long-lived Assets, to determine if the cash flows expected to be generated by the Auryxia
asset group over the estimated remaining useful life of the primary assets were sufficient to recover the carrying value of the Auryxia asset group. Based on
this analysis, the undiscounted cash flows were not sufficient to recover the carrying value of the Auryxia asset group. As a result, the Company was
required to perform Step 3 of the impairment test to determine the fair value of the Auryxia asset group.

To estimate the fair value, the Company performed a business enterprise valuation for the Auryxia asset group using the income approach, which is based
on a discounted cash flow analysis and calculates the fair value by estimating the after-tax cash flows attributable to the asset group and then discounting
the after-tax cash flows to present value using a risk-adjusted discount rate. Key estimates and assumptions used in the valuations included projected
revenues and expenses related to the asset, estimated contributory asset charges, and a risk-adjusted discount rate of 9.5% to calculate the present value of
the future expected cash inflows. The Company believes its assumptions are consistent with the plans and estimates that a market participant would use to
manage the business. The discount rates used are intended to reflect the risks inherent in future cash flow projections and were based on an estimate of the
weighted average cost of capital, or WACC, of market participants relative to the Auryxia asset group.

As a result of this analysis, the fair value of the Auryxia asset group was below its carrying value, and the Company recorded an impairment charge of
$115.5 million during the three months ended June 30, 2020 and made a corresponding adjustment to the estimated useful life of the developed product
rights for Auryxia from nine years to seven years. The impairment charge has been entirely allocated to the Company’s only intangible asset, the developed
product rights for Auryxia, as all other long-lived assets had fair values that were either equal to or greater than their carrying value. Per ASC 360-10, the
carrying amount of a long-lived asset of the group would not be reduced below its fair value. The Company believes its assumptions used to determine the
fair value of the Auryxia asset group are reasonable. In the event the estimates and assumptions used in the valuation of the Auryxia asset group, including
the forecasted projections, change in the future, additional impairment charges could be recorded in the future.

In the fourth quarter of 2020, as part of the Company's routine forecasting process, the Company reassessed and prospectively adjusted the estimated useful
life of the developed product rights for Auryxia from seven years to six years. This was not deemed an impairment indicator as of December 31, 2020.

Goodwill

Goodwill was $55.1 million as of December 31, 2022 and 2021. The Company operates in one operating segment which the Company considers to be the
only reporting unit. Goodwill is evaluated for impairment at the reporting unit level on an annual basis as of October 1, and more frequently if indicators
are present or changes in circumstances suggest that an impairment may exist. Events that could indicate impairment and trigger an impairment assessment
include, but are not limited to, an adverse change in current economic or market conditions, including a significant prolonged decline in market
capitalization, a significant adverse change in legal factors, unexpected adverse business conditions, and an adverse action by a regulator. During the year
ended December 31, 2022, the Company evaluated business factors, including the receipt of the CRL from the FDA for vadadustat, the Company's market
capitalization as impacted by a recent decline in the Company's stock price, the impact of the Otsuka Termination Agreement on the Company's future cash
flows, and the impact of the BioVectra Termination Agreement to the Company's excess purchase commitment liability to determine if there were events or
changes in circumstance to indicate that the fair value of the reporting unit was less than its carrying value. The Company performed a qualitative
impairment assessment of the Company's goodwill balance as the year ended December 31, 2022. The Company determined that it was not more likely
than not that the fair value of the reporting unit was less than its carrying value and, therefore, did not perform a further quantitative impairment test.

The Company's qualitative assessments were based on the Company's estimates and assumptions, a number of which are dependent on external factors and
actual results may differ materially from these estimates. In addition, the future occurrence of events including, but not limited to, an adverse change in
current economic and market conditions, including a significant prolonged decline in market capitalization, a significant adverse change in legal factors,
unexpected adverse business conditions and an adverse action or assessment by a regulator could indicate potential impairment and trigger an impairment
assessment of goodwill, which could result in an impairment of goodwill. As a result of the significance of goodwill, the Company's results of

155

operations and financial position in a future period could be negatively impacted should an impairment test be triggered that results in an impairment of
goodwill.

There were no impairments of goodwill during the years ended December 31, 2021 and 2020.

10. Accrued Expenses

Accrued expenses are as follows:

Product revenue allowances
Accrued clinical
Amounts due to collaboration partners
Accrued payroll and related
Lease liability
Royalties
Professional fees
Accrued commercial manufacturing
Accrued restructuring
Accrued other

Total accrued expenses

11. Debt

Term Loans

December 31, 2022

December 31, 2021

(in thousands)

$

$

29,005  $
5,755 
— 
11,481 
4,744 
3,804 
1,734 
4,310 
2,751 
7,413 
70,997  $

26,624 
14,036 
22,654 
15,863 
4,802 
3,472 
1,899 
3,843 
— 
11,263 
104,456 

On November 11, 2019, the Company, with Keryx as guarantor, entered into a loan agreement, or the Loan Agreement, with BioPharma Credit PLC as
collateral agent and a lender, or the Collateral Agent, and BioPharma Credit Investments V (Master) LP as a lender, pursuant to which term loans in an
aggregate principal amount of $100.0 million were made available to the Company in two tranches, subject to certain terms and conditions, or the Term
Loans. BioPharma Credit PLC subsequently transferred its interest in the Term Loans, solely in its capacity as a lender, to its affiliate, BPCR Limited
Partnership. The Collateral Agent and the lenders are collectively referred to as Pharmakon. The first tranche of $80.0 million, or Tranche A, was drawn on
November 25, 2019, or the Tranche A Funding Date, and the second tranche of $20.0 million, or Tranche B, was drawn on December 10, 2020, or the
Tranche B Funding Date. Each of the Tranche A Funding Date and the Tranche B Funding Date, a Funding Date.

Proceeds from the Term Loans may be used for general corporate purposes. The Company and Keryx entered into a Guaranty and Security Agreement with
the Collateral Agent, or the Guaranty and Security Agreement, on the Tranche A Funding Date. Pursuant to the Guaranty and Security Agreement, the
Company’s obligations under the Term Loans are unconditionally guaranteed by Keryx, or the Guarantee. Additionally, the obligations of the Company and
Keryx under the Term Loans and the Guarantee are secured by a first priority lien on certain assets of the Company and Keryx, including Auryxia and
certain related assets, cash, and certain equity interests held by the Company and Keryx, collectively the Collateral.

The Term Loans bear interest at a floating rate per annum equal to the three-month LIBOR rate plus 7.50%, subject to a 2.00% LIBOR floor and a 3.35%
LIBOR cap, payable quarterly in arrears. The Term Loans will mature on the fifth anniversary of the Tranche A Funding Date, or the Maturity Date. The
Company will repay the principal under the Term Loans in equal quarterly payments starting on the 33rd-month anniversary of the applicable Funding
Date, or the Amortization Schedule. If certain conditions were met, it would have had the option to repay the principal in equal quarterly payments starting
on the 48th-month anniversary of the applicable Funding Date. One of these conditions was approval of vadadustat; however, the Company received the
CRL from the FDA in March 2022 stating that the FDA had determined that it could not approve the NDA in its present form. Therefore, the Company is
no longer eligible for this option to delay repayment of the principal under the Loan Agreement. During the year ended December 31, 2022, the Company
made its first quarterly principal payment under the Term

156

 
 
 
Loans of $8.0 million. Under certain circumstances, unless certain liquidity conditions are met, the Maturity Date may decrease by up to one year, and the
Amortization Schedule may correspondingly commence up to one year earlier.

On the Tranche A Funding Date, the Company paid to Pharmakon a facility fee equal to 2.00% of the aggregate principal amount of the Term Loans, or
$2.0 million, in addition to other expenses incurred by Pharmakon and reimbursed by the Company, or Lender Expenses. The Tranche A draw was $77.3
million, net of facility fee, Lender Expenses and issuance costs. The Tranche B draw was $20.0 million, net of immaterial Lender Expenses and issuance
costs. The Loan Agreement permits voluntary prepayment at any time in whole or in part, subject to a prepayment premium. The prepayment premium
would be 2.00% of the principal amount being prepaid prior to the third anniversary of the applicable Funding Date, 1.00% on or after the third
anniversary, but prior to the fourth anniversary, of the applicable Funding Date, and 0.50% on or after the fourth anniversary of the applicable Funding Date
but prior to the Maturity Date, and a make-whole premium on or prior to the second anniversary of the applicable Funding Date in an amount equal to
foregone interest through the second anniversary of the applicable Funding Date. A change of control triggers a mandatory prepayment of the Term Loans.

The Loan Agreement contains customary representations, warranties, events of default and covenants of the Company and its subsidiaries, including
maintaining, on an annual basis, a minimum liquidity threshold which started in 2021, and on a quarterly basis, a minimum net sales threshold for Auryxia
which started in the fourth quarter of 2020. On February 18, 2022, the Loan Agreement was amended pursuant to a First Amendment and Waiver, or the
First Amendment and Waiver, which waived the provision under the Loan Agreement that required the Company to not be subject to any qualification as a
going concern within the Company's 2021 Annual Report on Form 10-K. Pursuant to the First Amendment and Waiver, the Company’s filings of Form 10-
Q for fiscal quarters ending June 30, 2022 and September 30, 2022, and its future Annual Reports on Form 10-K, must not be subject to any qualification
as to going concern, which requirement as to the Company's filings on Form 10-Q was waived in the Second Amendment and Waiver. If the Company does
not satisfy the covenant as to going concern, in any of these filings, the Company will be in default under the Loan Agreement. If an event of default occurs
and is continuing under the Loan Agreement, the Collateral Agent is entitled to take enforcement action, including acceleration of amounts due under the
Loan Agreement. Under certain circumstances, a default interest rate will apply on all outstanding obligations during the occurrence and continuance of an
event of default. As of December 31, 2022, the Company determined that no events of default had occurred.

On July 15, 2022, or the Effective Date, the Company and Pharmakon entered into the Second Amendment and Waiver, or the Second Amendment and
Waiver, which amended and waived certain provisions of the Loan Agreement, as amended by the First Amendment and Waiver.

Pursuant to the Second Amendment and Waiver, on the Effective Date, the Company made a $5.0 million prepayment of the principal of the Tranche A
loan, or the Second Amendment Effective Date Tranche A Prepayment, and a $20.0 million prepayment of principal of the Tranche B loan, or the Second
Amendment Effective Date Tranche B Prepayment, in each case, together with any and all accrued and unpaid interest on such prepayments of principal to
the Effective Date. In connection therewith, the Company also paid $0.5 million in prepayment premiums under the Loan Agreement. During the year
ended December 31, 2022, the Company recorded a debt extinguishment loss of $0.9 million. Subject to the payment in full of the Second Amendment
Effective Date Tranche A Prepayment and the Second Amendment Effective Date Tranche B Prepayment, Pharmakon agreed to, among other things, (1)
increase the amount of the working capital facility established in connection with the Company’s Second Amended and Restated License Agreement with
CSL Vifor, which facility is part of the definition of Permitted Indebtedness (as such term is defined in the Loan Agreement) under the Loan Agreement,
that the Company is permitted to repay to CSL Vifor without causing an acceleration of the liabilities under the Loan Agreement, (2) waive the requirement
that the Company’s Quarterly Reports on Form 10-Q for the fiscal quarters ending June 30, 2022 and September 30, 2022 not be subject to any
qualification as to going concern, and (3) waive certain amounts payable under the Loan Agreement in connection with the Second Amendment Effective
Date Tranche B Prepayment. Future principal payments pursuant to the contractual terms of the Loan Agreement, as amended, as of December 31, 2022 are
as follows (in thousands):

157

2023
2024
Total before unamortized discount and issuance costs
Less: unamortized discount and issuance costs
Total term loans

Principal
Payments

(in thousands)

32,000 
35,000 
67,000 
(922)
66,078 

$

$

The Company assessed the terms and features of the Loan Agreement in order to identify any potential embedded features that would require bifurcation or
any beneficial conversion feature. As part of this analysis, the Company assessed the economic characteristics and risks of the Loan Agreement, including
put and call features. The terms and features assessed include a potential extension to the interest-only period dependent on both no event of default having
occurred and continuing and on the Company achieving certain regulatory and revenue conditions. The Company also assessed the acceleration of the
obligations under the Loan Agreement under an event of default. In addition, under certain circumstances, a default interest rate will apply on all
outstanding obligations during the occurrence and continuance of an event of default. In accordance with ASC 815, the Company concluded that these
features are not clearly and closely related to the host instrument, and represent a single compound derivative that is required to be re-measured at fair value
on a quarterly basis.

The fair value of the derivative liability related to the Company’s Loan Agreement was $0.8 million and $1.8 million as of December 31, 2022 and 2021,
respectively. The Company classified the derivative liability as a non-current liability on the balance sheet at December 31, 2022.

The Company recognized approximately $9.5 million, $10.9 million, and $8.9 million of interest expense related to the Loan Agreement during the years
ended December 31, 2022, 2021, and 2020, respectively.

12. Stockholders’ Equity

Authorized and Outstanding Capital Stock
On June 5, 2020, the Company filed a Certificate of Amendment to its Ninth Amended and Restated Certificate of Incorporation, or its Charter, to increase
the number of authorized shares of common stock from 175,000,000 to 350,000,000. As of December 31, 2022, the authorized capital stock of the
Company included 350,000,000 shares of common stock, par value $0.00001 per share, of which 184,135,714 and 177,000,963 shares were issued and
outstanding at December 31, 2022 and 2021, respectively; and 25,000,000 shares of undesignated preferred stock, par value $0.00001 per share, of which
no shares were issued and outstanding at December 31, 2022 and 2021.

At-the-Market Facility

On March 12, 2020, the Company filed a prospectus supplement relating to the Company's sales agreement with Cantor Fitzgerald & Co., or the Prior Sales
Agreement, pursuant to which it was able to offer and sell up to $65.0 million of its common stock at current market prices from time to time. Through
December 31, 2020, the Company sold 3,509,381 shares of common stock under this program with net proceeds (after deducting commissions and other
offering expenses) of $10.6 million. During the three months ended March 31, 2021, the Company sold 5,224,278 shares of common stock under this
program with net proceeds (after deducting commissions and other offering expenses) of $15.9 million.

On February 25, 2021, the Company filed a prospectus relating to the sales agreement with its new shelf registration statement (which replaced the prior
shelf registration statement), pursuant to which it was able to offer and sell up to $100.0 million of its common stock at current market prices from time to
time. Through December 31, 2021, the Company sold 21,128,065 shares of common stock under this program with net proceeds (after deducting
commissions and other offering expenses) of $72.4 million. On March 1, 2022, the Company filed a prospectus relating to the Prior Sales Agreement,
pursuant to which it was authorized to offer and sell up to $25.3 million of its common stock at current market prices from time to time. On March 16,
2022, the Company terminated the Prior Sales Agreement. During the three months ended March 31, 2022, the Company sold 404,600 shares of common
stock under this program with net proceeds (after deducting commissions and other offering expenses) of $0.8 million.

On April 7, 2022, the Company entered into an Open Market Sale Agreement
offer and sale of common stock at current market prices in amounts to be determined from time to time. Also, on April 7, 2022, the Company filed a
prospectus supplement relating to the Sales Agreement, pursuant to which it

, or the Sales Agreement, with Jefferies LLC, or Jefferies, as agent, for the

SM

158

 
 
 
is able to offer and sell under the Sales Agreement up to $26.0 million of its common stock at current market prices from time to time. From the date of
filing of the prospectus supplement through the date of the filing of this Annual Report on Form 10-K, the Company has not sold any shares of its common
stock under this program.

Equity Plans

The Company maintains one stock incentive plan, the 2014 Incentive Plan, or the 2014 Plan, as well as the 2014 Employee Stock Purchase Plan, or the
2014 ESPP. The 2014 Plan replaced the Company’s Amended and Restated 2008 Equity Incentive Plan, or the 2008 Plan, however, options or other awards
granted under the 2008 Plan prior to the adoption of the 2014 Plan that have not been settled or forfeited remain outstanding and effective. On June 6, 2019,
the Company’s stockholders approved the Amended and Restated 2014 Employee Stock Purchase Plan, or the ESPP. In May 2016, the Company’s Board
of Directors approved an inducement award program that was separate from the Company’s equity plans and which, consistent with Nasdaq Listing Rule
5635(c)(4), did not require stockholder approval, or the Inducement Award Program. During the year ended December 31, 2022, the Company granted
435,000 options to purchase shares of the Company’s common stock to new hires under the Inducement Award Program, of which 258,000 options to
purchase shares of the Company's common stock remained outstanding at December 31, 2022.

The 2014 Plan allows for the granting of stock options, stock appreciation rights, or SARs, restricted stock, unrestricted stock, restricted stock units, or
RSUs, performance awards and other awards convertible into or otherwise based on shares of the Company’s common stock. Dividend equivalents may
also be provided in connection with an award under the 2014 Plan. The Company’s employees, officers, directors and consultants and advisors are eligible
to receive awards under the 2014 Plan. The Company initially reserved 1,785,000 shares of its common stock for the issuance of awards under the 2014
Plan. The 2014 Plan provides that the number of shares reserved and available for issuance under the 2014 Plan will automatically increase annually on
January 1 of each calendar year, by an amount equal to three percent (3%) of the number of the Company's shares outstanding on a fully diluted basis as of
the close of business on the immediately preceding December 31, or the 2014 Plan Evergreen Provision. The Company’s Board of Directors may act prior
to January 1 of any year to provide that there will be no automatic increase in the number of Akebia Shares available for grant under the 2014 Plan for that
year (or that the increase will be less than the amount that would otherwise have automatically been made). On December 12, 2018, in connection with the
consummation of the Merger, the Company assumed outstanding and unexercised options to purchase Keryx's stock, as adjusted by the Exchange
Multiplier pursuant to the terms of the Merger Agreement, under the following Keryx equity plans, or the Keryx Equity Plans: the Keryx 1999 Share
Option Plan, the Keryx 2004 Long-Term Incentive Plan, the Keryx 2007 Incentive Plan, the Keryx Amended and Restated 2013 Incentive Plan, and the
Keryx 2018 Equity Incentive Plan, or the Keryx 2018 Plan. In addition, the number of Keryx shares available for issuance under the Keryx 2018 Plan, as
adjusted by the Exchange Multiplier pursuant to the terms of the Merger Agreement, may be used for awards granted by the Company under its 2014 Plan,
or the Assumed Shares, provided that the Company uses the Assumed Shares for individuals who were not employees or directors of the Company prior to
the consummation of the Merger. During the year ended December 31, 2022, the Company granted 3,233,500 options to purchase Akebia Shares to
employees under the 2014 Plan, 435,000 options to purchase Akebia Shares to employees under the Inducement Award Program, 5,219,908 Akebia RSUs
to employees under the 2014 Plan, 800,000 performance stock units, or PSUs, to employees under the 2014 Plan, 140,700 options to purchase Akebia
Shares to directors under the 2014 Plan, and 95,900 RSUs to directors under the 2014 Plan.  

The ESPP provides for the issuance of shares of the Company’s common stock to participating employees at a discount to their fair market value. The
maximum aggregate number of shares at December 31, 2022 of the Company’s common stock available for future issuance under the ESPP is 4,837,995.
Under the ESPP, each offering period is six months, at the end of which employees may purchase shares of the Company’s common stock through payroll
deductions made over the term of the offering. The per-share purchase price at the end of each offering period is equal to the lesser of eighty-five percent
(85%) of the closing price of the Company’s common stock at the beginning or end of the offering period.

Shares Reserved for Future Issuance

The Company has reserved for future issuance the following number of shares of common stock:

Common stock options, RSUs and PSUs outstanding (1)
Shares available for issuance under Akebia equity plans (2)
Warrant to purchase common stock
Shares available for issuance under the ESPP
Total

December 31, 2022

December 31, 2021

17,407,227 
5,498,984 
— 
4,837,995 
27,744,206 

16,065,218 
4,675,734 
509,611 
5,173,141 
26,423,704 

159

 
(1)
(2)

Includes awards granted under the 2014 Plan and the Inducement Award Program and awards issued in connection with the Merger.
On January 1, 2023, January 1, 2022 and January 1, 2021, the shares reserved for future grants under the 2014 Plan increased by 6,046,288,
5,807,270 and 4,880,775 shares, respectively, pursuant to the 2014 Plan Evergreen Provision.

Stock-Based Compensation

Stock Options

Service-Based Stock Options

On February 28, 2022, as part of the Company’s annual grant of equity, the Company issued 2,833,500 stock options to employees. In addition, the
Company issues stock options to directors, new hires and occasionally to other employees not in connection with the annual grant process. Options granted
by the Company generally vest over periods of between 12 and 48 months, subject, in each case, to the individual’s continued service through the
applicable vesting date. Options generally vest either 100% on the first anniversary of the grant date or in installments of (i) 25% at the one year
anniversary and (ii) 12 equal quarterly installments beginning after the one year anniversary of the grant date, subject to the individual’s continuous service
with the Company. Options generally expire ten years after the date of grant. The Company recorded approximately $6.8 million, $8.9 million and $8.5
million of stock-based compensation expense related to stock options granted during the years ended December 31, 2022, 2021 and 2020, respectively.

The assumptions used in the Black-Scholes pricing model to estimate the grant date fair value of options granted under the 2014 Plan are as follows:

Risk-free interest rate
Dividend yield
Volatility
Expected term (years)

Year ended December 31,

2022

2021

2020

1.69% -

4.17%

0.66% -

1.37%

0.32% -

1.38%

—%

—%

—%

79.77% -
-

5.51

91.57%
6.25

77.81% -
-

5.51

81.79%
6.25

69.56% -
-

5.51

75.91%
6.25

The following table summarizes the Company’s stock option activity, excluding performance-based options, for the year ended December 31, 2022:

Outstanding, December 31, 2021
Granted
Exercised
Forfeited
Expired/cancelled
Outstanding, December 31, 2022

Options exercisable, December 31, 2022

Vested and expected to vest, December 31, 2022

Shares
11,398,215  $
3,809,200  $
(142,440) $
(3,331,840) $
(407,045) $
11,326,090  $

6,239,437  $

11,326,090  $

Weighted-Average
Exercise Price

Weighted-Average
Contractual Life
(in years)

Aggregate
Intrinsic Value

7.60 
1.81 
0.47 
6.43 
9.52 
6.01 

8.37 

6.01 

$

$
$

7.26 $

6.08 $

267,830 

44,905 
3,813 

112,709 

1,904 

The weighted-average grant date fair values of options granted in the years ended December 31, 2022, 2021, and 2020 were $1.27, $2.29, and $5.63 per
share, respectively. There was an immaterial intrinsic value of options exercised during the year ended December 31, 2022 as the value of the options
exercised in 2022 was immaterial. There was no intrinsic value of options exercised during the year ended December 31, 2021, as there were no options
exercised in 2021. The total intrinsic value of options exercised during the year ended December 31, 2020 was $0.4 million. The fair value of options that
vested during the years ended December 31, 2022, 2021, and 2020 were $8.4 million, $10.6 million, and $6.8 million, respectively. As of December 31,
2022, there was approximately $8.1 million of unrecognized compensation cost related to stock options outstanding under the Company’s 2014 Plan or
made pursuant to the Inducement Award Program, which is expected to be recognized over a weighted average period of 2.04 years.

160

 
 
 
 
 
 
 
 
 
 
Performance-Based Stock Options

The Company also grants performance-based stock options to employees under the 2014 Plan. The performance-based stock options granted by the
Company generally vest in connection with the achievement of specified commercial, regulatory, and corporate milestones. The expense recognized for
these awards is based on the grant date fair value of the Company's common stock multiplied by the number of options granted and recognized over time
based on the probability of meeting such commercial, regulatory and corporate milestones. The Company issued 400,000 and 99,558 performance-based
options during the years ended December 31, 2022 and 2021, respectively. As of December 31, 2022, the Company had 400,000 performance-based
options outstanding compared to 99,558 performance-based options outstanding at December 31, 2021.

The following table summarizes the Company’s performance-based option activity for the year ended December 31, 2022:

Outstanding, December 31, 2021
Granted
Exercised
Forfeited/cancelled
Outstanding, December 31, 2022

Shares

Weighted-Average
Exercise Price

Weighted-Average
Contractual Life
(in years)

Aggregate
Intrinsic Value

99,558  $
400,000  $
—  $
(99,558) $
400,000  $

2.74 
0.41 
— 
2.74 
0.41 

$
$
$

— 
1,120 
— 

9.4 $

66,800 

The Company did not record any stock-based compensation expense related to performance-based options during 2022, 2021 and 2020. There were
no performance-based options that vested during fiscal year 2022, 2021 or 2020. As of December 31, 2022, there were no unrecognized compensation costs
related to performance-based stock options under the Company’s 2014 Plan.

Restricted Stock Units

Service-Based Restricted Stock Units

On February 28, 2022, as part of the Company’s annual grant of equity, the Company issued 2,899,008 RSUs to employees. In addition, the Company also
occasionally issues RSUs not in connection with the annual grant process to employees. Generally, RSUs granted by the Company vest in one of the
following ways: (i) 100% of each RSU grant vests on the first anniversary of the grant date, (ii) one third of each RSU grant vests on the first, second and
third anniversaries of the grant date, (iii) 50% of each RSU grant vests on the first anniversary and 25% of each RSU grant vests every six months after the
one year anniversary of the grant date, or (iv) one third of each RSU grant vests on the first anniversary of the grant date and the remaining two-thirds vests
in eight substantially equal quarterly installments beginning after the one year anniversary, subject, in each case, to the individual’s continued service
through the applicable vesting date. The expense recognized for these awards is based on the grant date fair value of the Company’s common stock
multiplied by the number of units granted and recognized on a straight-line basis over the vesting period. The Company recorded approximately $7.6
million, $12.9 million and $14.6 million of stock-based compensation expense related to employee RSUs in 2022, 2021 and 2020, respectively.

Performance-Based Restricted Stock Units

During the year ended December 31, 2022, the Company issued 400,000 performance-based restricted stock units, or PSUs, to the Company’s executives.
The PSUs granted by the Company vest in connection with the achievement of specified commercial, regulatory, and corporate milestones. The expense
recognized for these awards is based on the grant date fair value of the Company’s common stock multiplied by the number of units granted and recognized
over time based on the probability of meeting such commercial, regulatory, and corporate milestones. The Company recorded approximately $0.1 million,
$0.3 million and $0.5 million of stock-based compensation expense related to employee PSUs in 2022, 2021 and 2020, respectively.

The following table summarizes the Company’s RSU and PSU activity for the year ended December 31, 2022:

161

 
 
 
 
Unvested balance, December 31, 2021
Granted
Vested
Forfeited
Unvested balance, December 31, 2022

Shares

4,554,343  $
5,715,808  $
(2,252,565) $
(2,349,551) $
5,668,035  $

Weighted-
Average Grant
Date Fair Value

5.17 
1.30 
5.01 
3.33 
2.09 

The total fair value of RSUs and PSUs that vested during 2022, 2021 and 2020 (measured on the date of vesting) was $11.2 million, $15.4 million, and $9.4
million, respectively. As of December 31, 2022, there was approximately $5.2 million of unrecognized compensation cost related to RSUs and PSUs,
which is expected to be recognized over a weighted average period of 1.44 years.

Employee Stock Purchase Plan

The first offering period under the ESPP opened on January 2, 2015. The Company issued 335,146 shares during the year ended December 31, 2022. The
Company recorded approximately $0.1 million, $0.6 million and $0.8 million of stock-based compensation expense related to the ESPP during 2022, 2021
and 2020, respectively.

Compensation Expense Summary

The Company has classified its stock-based compensation expense related to share-based awards as follows:

2022

2021

2020

Years ended December 31,

(in thousands)

3,683  $

10,969 
14,652  $

5,816  $

16,919 
22,735  $

2022

2021

2020

Years ended December 31,

(in thousands)

6,839  $
7,566 
100 
147 
14,652  $

8,958  $

12,927 
294 
556 
22,735  $

6,113 
18,347 
24,460 

8,517 
14,639 
464 
840 
24,460 

$

$

$

$

Research and development
Selling, general and administrative
Total

Compensation expense by type of award:

Stock options
Restricted stock units
Performance RSUs
Employee stock purchase plan
Total

13. Income Taxes

The Company’s income tax provision was computed based on the federal statutory rate and the state statutory rates, net of the related federal benefit. There
was no current or deferred income tax expense or benefit for the years ended December 31, 2022 and 2021 due to the Company’s net losses and increases
in its valuation allowance against its deferred tax assets.

Our effective income tax rate differs from the statutory federal income tax rate as follows for the years ended December 31, 2022, 2021 and 2020:

162

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Federal tax at statutory rate
State and local tax at statutory rate
Research and development tax credits
Change in valuation allowance
Other permanent differences
Stock Option Cancellations
Stock Option Shortfalls
Effect of rate changes
Provision to Return Adjustment
Prior Period Adjustment to State NOL DTA
Other
Effective tax rate

Year ended December 31,

2022

2021

2020

21.0 %
2.4 
— 
(19.2)
(1.0)
(2.5)
(1.6)
0.6 
0.3 
— 
— 
— %

21.0 %
3.0 
— 
(22.7)
(1.0)
— 
— 
0.3 
0.3 
— 
(0.9)

— %

21.0 %
3.0 
0.1 
(21.5)
(0.4)
— 
— 
0.8 
(1.5)
(1.5)
— 
— %

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes. When realization of the deferred tax asset is more likely than not to occur, the benefit related to the
deductible temporary differences attributable to operations is recognized as a reduction of income tax expense. A valuation allowance is recorded against
deferred tax assets if it is more likely than not that some or all of the deferred tax assets will not be realized. The Company cannot be certain that future
taxable income will be sufficient to realize its deferred tax assets. Accordingly, the Company has recorded a valuation allowance against the Company’s
otherwise recognizable net deferred tax assets. The Company continues to maintain the underlying tax benefits to offset future taxable income and to
monitor the need for a valuation allowance based on the profitability of its future operations. The valuation allowance increased by approximately $17.8
million and $64.2 million during the years ended December 31, 2022 and 2021, respectively. Significant components of the Company’s deferred tax assets
and liabilities are as follows:

163

 
 
Deferred tax assets:
Accrued expenses
Deferred revenue
Sale of Royalty
Stock based compensation
Research and development credits
Capitalized research and development costs
Other non-current liabilities
Net operating loss carryforward
ASC 842 lease liability
Inventory reserve
Refund liability
Other

Total deferred tax assets

Less valuation allowance

Total deferred tax assets, net of valuation allowance

Deferred tax liabilities:

Fixed assets
Intangible assets
Inventory
ASC 842 ROU asset
Other

Total deferred tax liabilities

Net deferred tax liability

December 31,

2022

2021

(in thousands)

$

2,924  $
1,250 
13,291 
8,317 
4,827 
13,825 
2,754 
288,147 
8,032 
17,411 
9,478 
13,159 
383,415 
(359,926)
23,489 

— 
(15,981)
— 
(7,426)
(82)
(23,489)

$

—  $

3,306 
9,725 
12,037 
9,194 
5,034 
— 
20,424 
286,908 
9,096 
10,281 
— 
10,483 
376,488 
(342,122)
34,366 

—
(25,598)
— 
(8,486)
(282)
(34,366)
— 

At December 31, 2022 and 2021, the Company had approximately $0.1 million (after amortization of $1.8 million) and $0.3 million (after amortization of
$1.7 million), respectively, of start-up expenses capitalized for income tax purposes with amortization available to offset future federal, state and local
income tax.

As of December 31, 2022 and 2021, the Company had approximately $1,227.9 million and $1,223.3 million, respectively, of federal NOL carry-forwards
which expire through 2037. Included in the $1,227.9 million of federal NOLs are losses of $645.9 million that will carry forward indefinitely as a result of
the Tax Cuts and Jobs Act. Additionally, at December 31, 2022 and 2021, the Company had approximately $1,803.6 million and $1,792.1 million,
respectively, of state NOL carry-forwards, which expire through 2042. The Company also has approximately $2.5 million of federal research and
development tax credit carryforwards which expire through 2040 and $2.9 million of state research and development tax credit carryforwards which expire
through 2036.

Under the provisions of the Internal Revenue Code, the net operating losses and tax credit carry-forwards are subject to review and possible adjustment by
the Internal Revenue Service and state tax authorities. Net operating losses and tax credit carryforwards may become subject to an annual limitation under
Internal Revenue Code 382 and 383 if there is more than a 50% change in ownership of the stockholders that own 5% or more of the Company’s
outstanding stock over a three-year period. The Company completed an evaluation of its ownership changes and concluded that an ownership change did
occur on December 12, 2018 for both Akebia and Keryx in connection with the Merger. As a consequence of this ownership change, the Company’s NOLs
and tax credit carryforwards allocable to the tax periods preceding the ownership change became subject to limitation under Section 382. The Company
reduced its associated deferred tax assets by $44.9 million as a result of the limitation.

The Company files income tax returns in the U.S. federal and various state and local jurisdictions. For federal and state income tax purposes, the 2021,
2020 and 2019 tax years remain open for examination under the normal three-year statute of limitations.

164

 
 
 
 
 
 
The statute of limitations for income tax audits in the United States will commence upon utilization of net operating losses and will expire three years from
the filing of the tax return the loss was utilized on.

There was no accrual for uncertain tax positions or for interest and penalties related to uncertain tax positions for 2022, 2021 and 2020. The Company does
not believe that there will be a material change in its unrecognized tax positions over the next twelve months. All of the unrecognized tax benefits, if
recognized, would be offset by the valuation allowance.

14. Employee Retirement Plan

In 2008, the Company established a retirement plan, or the Plan, authorized by Section 401(k) of the Internal Revenue Code. In accordance with the Plan,
all employees who have attained the age of 21 are eligible to participate in the Plan as of the first Entry Date, as defined, following their date of
employment. Each employee can contribute a percentage of compensation up to a maximum of the statutory limits per year. Company contributions are
discretionary and contributions in the amount of approximately $2.6 million, $1.8 million and $1.6 million were made during the years ended
December 31, 2022, 2021 and 2020, respectively.

15. Commitments and Contingencies

Leases

The Company leases approximately 65,167 square feet of office and lab space in Cambridge, Massachusetts under a lease which was most recently
amended in November 2020, collectively the Cambridge Lease. Under the Third Amendment to the Cambridge Lease, or the Third Amendment, executed
in July 2016, total monthly lease payments under the initial base rent were approximately $242,000 and are subject to annual rent escalations. In addition to
such annual rent escalations, base rent payments for a portion of said premises commenced on January 1, 2017 in the monthly amount of approximately
$22,000. The Fourth Amendment to the Cambridge Lease, executed in May 2017, provided additional storage space to the Company and did not impact
rent payments. In April 2018, the Company entered into a Fifth Amendment to the Cambridge Lease, or the Fifth Amendment, for an additional 19,805
square feet of office space on the 12th floor. Monthly lease payments for the existing 45,362 square feet of office and lab space, under the Third
Amendment, remain unchanged. The new space leased by the Company was delivered in September 2018 and additional monthly lease payments of
approximately $135,000 commenced in February 2019 and are subject to annual rent escalations, which commenced in September 2019. In November
2020, the Company entered into a Sixth Amendment to the Cambridge Lease, or the Sixth Amendment, to extend the term of the Cambridge Lease with
respect to the lab space from November 30, 2021 to January 31, 2025. The Sixth Amendment includes two months of free rent starting in December 2020
and additional monthly lease payments of approximately $48,000, which commenced in December 2021, and is subject to annual rent escalations, which
commenced in December 2022.

Additionally, the Company has a lease for 27,300 square feet of office space in Boston, Massachusetts, or the Boston Lease. The total monthly lease
payments under the base rent are approximately $136,000 and are subject to annual rent escalations. In February 2022, the Company entered into the First
Amendment to the Boston Lease, or the First Lease Amendment, to extend the term of the Boston Lease from February 2023 to July 2031. The First Lease
Amendment includes five months of free rent starting in March 2023 and monthly lease payments of $200,122 commencing on August 1, 2023, with an
annual rent escalation of approximately 2% commencing on August 1, 2024. The First Lease Amendment also includes a landlord's allowance for certain
leasehold improvements to the premises in an amount of up to $1,954,680, provided that such allowance must be used prior to August 1, 2024.

The term of the Cambridge Lease with respect to the office space expires on September 11, 2026, with one five-year extension option available. The term
of the Boston Lease office space expires on July 31, 2031, with an extension option for one additional five-year extension option available. The renewal
options in these real estate leases were not included in the calculation of the operating lease assets and operating lease liabilities as the renewal is not
reasonably certain. The term of the Cambridge Lease with respect to the lab space expires on January 31, 2025, with an extension option for one additional
period through September 11, 2026. The renewal options in this real estate lease were included in the calculation of the operating lease assets and operating
lease liabilities as the renewal is reasonably certain. The lease agreements do not contain residual value guarantees. Operating lease costs were $7.1 million,
$6.7 million and $6.7 million for the years ended December 31, 2022, 2021and 2020, respectively. Cash paid for amounts included in the measurement of
operating lease liabilities were $7.2 million, $7.1 million and $7.0 million for the years ended December 31, 2022, 2021 and 2020, respectively.

In September 2019, Keryx entered into an agreement to sublease the Boston office space to Foundation Medicine, Inc., or Foundation. The sublease is
subject and subordinate to the Boston Lease between Keryx and the landlord. The term of the sublease commenced on October 16, 2019, upon receipt of
the required consent from the landlord for the sublease agreement,

165

and expired on February 27, 2023. Foundation is obligated to pay Keryx rent that approximates the rent due from Keryx to its landlord with respect to the
Boston Lease. Sublease rental income is recorded to other income. Keryx continues to be obligated for all payment terms pursuant to the Boston Lease, and
the Company will guaranty Keryx’s obligations under the sublease. Keryx recorded $1.8 million in sublease rental income from Foundation during each of
the years ended December 31, 2022, 2021 and 2020.

The Company has not entered into any material short-term leases or financing leases as of December 31, 2022.

The total security deposit in connection with the Cambridge Lease is $1.6 million as of December 31, 2022. Additionally, the Company recorded $1.1
million for the security deposit under the Boston Lease. Both the Cambridge Lease and the Boston Lease have their security deposits in the form of a letter
of credit, all of which are included as restricted cash in prepaid expenses and other current assets in the Company’s consolidated balance sheet as of
December 31, 2022.  

As of December 31, 2022, undiscounted minimum rental commitments under non-cancelable leases, for each of the next five years and total thereafter are
as follows:

2023
2024
2025
2026
2027
Thereafter
Total

Operating
Leases
(in thousands)

Lease Payments
to be Received
from Sublease

Net Operating
Lease Payments

$

$

6,950  $
8,162 
8,289 
6,132 
2,570 
9,631 
41,734  $

307  $
— 
— 
— 
— 
— 
307  $

6,643 
8,162 
8,289 
6,132 
2,570 
9,631 
41,427 

In arriving at the operating lease liabilities, the Company applied incremental borrowing rates ranging from 6.65% to 7.25%, which were based on the
remaining lease term at either the date of adoption of ASC 842 or the effective date of any subsequent lease term extensions. As of December 31, 2022, the
remaining lease terms ranged from 3.70 years to 8.59 years. As of December 31, 2022, the following represents the difference between the remaining
undiscounted minimum rental commitments under non-cancelable leases and the operating lease liabilities:

Undiscounted minimum rental commitments
Present value adjustment using incremental borrowing rate
Operating lease liabilities

Manufacturing Agreements

Operating
Leases

(in thousands)
Total

$

$

41,734 
(8,030)
33,704 

As a result of the Merger, the Company's contractual obligations include Keryx’s commercial supply agreements with BioVectra and Siegfried to supply
commercial drug substance for Auryxia.

Pursuant to the Manufacture and Supply Agreement with BioVectra and the Product Manufacture and Supply and Facility Construction Agreement with
BioVectra, the Company agreed to purchase minimum quantities of Auryxia drug substance annually at predetermined prices. On September 4, 2020, the
Company and BioVectra entered into an Amended and Restated Product Manufacture and Supply and Facility Construction Agreement, which provided for
reduced minimum quantity commitments and revised the predetermined prices. The price per kilogram decreased with an increase in quantity above the
predetermined purchase quantity tiers. In addition, the Manufacture and Supply Agreement with BioVectra and the Amended and Restated Product
Manufacture and Supply and Facility Construction Agreement with BioVectra required the Company to reimburse BioVectra for certain costs in connection
with construction of a new facility for the manufacture and supply of

166

 
 
 
 
 
 
 
 
 
Auryxia drug substance. These construction costs were recorded in other assets and amortized into drug substance as inventory was released to the
Company from BioVectra.

On December 22, 2022, the Company and BioVectra entered into the BioVectra Termination Agreement, pursuant to which the parties agreed, among other
things, to terminate, effective immediately, any and all existing agreements entered into between the parties in connection with the manufacture and supply,
by BioVectra to the Company, of Auryxia drug substance. Under the terms of the BioVectra Termination Agreement, the Company agreed to pay BioVectra
a total of $32.5 million consisting of (i) an upfront payment of $17.5 million and (ii) six quarterly payments of $2.5 million commencing in April 2024,
totaling $15.0 million. The upfront payment of $17.5 million was made during the quarter ended December 31, 2022 and was recognized to cost of goods
sold. In accordance with ASC 420, Exit or Disposal Cost Obligations, the Company recognized a liability and corresponding expense for the remaining
termination fees based on estimated fair value as of December 22, 2022, or the BioVectra Effective Date. The Company imputed interest on the liability for
the remaining termination fees at a rate of 17.0% per annum, which was determined based on certain factors, including the Company's credit rating,
comparable securities yield, and expected repayment period of the remaining termination fees. The Company recorded an initial discount on the remaining
termination fees on the consolidated balance sheet as of the BioVectra Effective Date. This resulted in the recording of a liability and corresponding charge
to cost of goods sold of $11.2 million during the quarter ended December 31, 2022. The discount on the liability balance is being amortized to interest
expense using the effective interest rate method over the term of the liability. In addition, each of the Company and BioVectra have released one another
from all existing and future claims and liabilities and the return of certain materials and documents. Furthermore, as it relates to all open purchase orders,
BioVectra is relieved from any obligations to manufacture any product or perform services under any such open purchase orders, and the Company is
relieved from any obligations to purchase any product under such open purchase orders. The Company is also relieved from any obligations to pay any
outstanding invoices related to performance by BioVectra of services and all other obligations under the agreements.

Pursuant to the Master Manufacturing Services and Supply Agreement between the Company and Siegfried, as amended through December 31, 2022, or
the Siegfried Agreement, the Company has agreed to purchase a minimum quantity of drug substance of Auryxia at predetermined prices. The term of the
Siegfried Agreement was to expire on December 31, 2022, but was automatically extended into 2023 as a result of Siegfried’s updated production schedule
for delivery of product originally scheduled for delivery in 2022. The Siegfried Agreement provides the Company and Siegfried with certain termination
rights. As of December 31, 2022, the Company is required to purchase a minimum quantity of drug substance for Auryxia annually at a total cost of
approximately $8.4 million through the third quarter of 2023. As of the date of the filing of this Annual Report on Form 10-K, the Company has amended
the Siegfried Agreement pursuant to which, the Company agreed to extend the term and purchase a minimum quantity of drug substance of Auryxia at a
predetermined price as further described in Note 17 to the Company's consolidated financial statements in Part II, Item 8. Financial Statements and
Supplementary Data of this Annual Report.

Certain of the Company's commercial supply agreements are executory contracts between Keryx and its contract manufacturers for Auryxia, which include
future firm purchase commitments. These executory contracts were deemed to have an off-market element related to the amount of purchase commitments
that exceed the current forecast. The Company regularly reviews its estimate of the excess purchase commitment liability including review of assumptions
of expected future demand, estimates of anticipated expiry of inventory under firm purchase commitments that are estimated to expire before they could be
sold as well as any modifications to supply agreements during each reporting period. The excess purchase commitment liability relating to these executory
contracts was $0 million and $76.7 million as of December 31, 2022 and 2021, respectively. During the quarter ended December 31, 2022, the Company
recorded a $74.3 million reduction to the excess purchase commitments liability within cost of goods sold driven by the reduction in purchase
commitments due to execution of the BioVectra Termination Agreement.

On April 9, 2019, the Company entered into a Supply Agreement with Esteve Química, S.A., or Esteve, or the Esteve Agreement. The Esteve Agreement
included the terms and conditions under which Esteve would manufacture vadadustat drug substance for commercial use. Pursuant to the Esteve
Agreement, the Company provided rolling forecasts to Esteve on a quarterly basis, or the Esteve Forecast. The Esteve Forecast reflected the Company’s
needs for vadadustat drug substance produced by Esteve over a certain number of months, represented as a quantity of vadadustat drug substance per
calendar quarter. The parties agreed to a volume-based pricing structure under the Esteve Agreement. On December 16, 2022, the Company, MTPC, and
Esteve executed the Assignment Agreement, pursuant to which the Supply Agreement between the Company and Esteve was assigned to MTPC. The
Assignment Agreement transferred the rights and obligations of the Supply Agreement to MTPC, specifically including the obligations under certain
purchase orders issued by the Company and accepted by Esteve. As such, the Company will have no further obligation to take delivery of or pay for
product delivered by Esteve under the transferred purchase orders.

On March 11, 2020, the Company entered into a Supply Agreement with Patheon Inc., or Patheon, or the Patheon Agreement. The Patheon Agreement
includes the terms and conditions under which Patheon will manufacture vadadustat drug product for commercial use. Pursuant to the Patheon Agreement,
the Company provides Patheon a long-term forecast on an annual basis, as well as short-term forecasts on a quarterly basis, or the Patheon Forecast. The
Patheon Forecast reflects the Company’s needs

167

for commercial supply of vadadustat drug product produced by Patheon, represented as a quantity of drug product per calendar quarter. The parties have
agreed to a volume-based pricing structure under the Patheon Agreement. The Patheon Agreement has an initial term beginning March 11, 2020 and ending
June 30, 2023 and automatically renews for successive one-year terms unless either party gives the other party eighteen months' prior written notice. The
current term of the Patheon Agreement ends June 30, 2025. Pursuant to the Patheon Agreement, the Company has agreed to purchase a certain percentage
of the global demand for vadadustat drug product from Patheon. As of December 31, 2022, the Company had a minimum commitment with Patheon for
$3.1 million through the third quarter of 2023.

On April 2, 2020, the Company entered into a Supply Agreement with STA Pharmaceutical Hong Kong Limited, a subsidiary of WuXi AppTec, or WuXi
STA, or the WuXi STA DS Agreement. The WuXi STA DS Agreement includes the terms and conditions under which WuXi STA will manufacture
vadadustat drug substance for commercial use. Pursuant to the WuXi STA DS Agreement, the Company provides rolling forecasts to WuXi STA on a
quarterly basis, or the WuXi STA DS Forecast. The WuXi STA DS Forecast reflects the Company’s needs for vadadustat drug substance produced by
WuXi STA over a certain number of quarters. The parties have agreed to a volume-based pricing structure under the WuXi STA DS Agreement. The WuXi
STA DS Agreement has an initial term of four years, beginning April 2, 2020 and ending April 2, 2024. Pursuant to the WuXi STA DS Agreement, the
Company has agreed to purchase a certain percentage of the global demand for vadadustat drug substance from WuXi STA. As of December 31, 2022, the
Company has committed to purchase $15.3 million of vadadustat drug substance from WuXi STA through the end of 2023.

On February 10, 2021, the Company entered into a Supply Agreement with WuXi STA, or the WuXi STA DP Agreement. The WuXi STA DP Agreement
includes the terms and conditions under which WuXi STA will manufacture and supply vadadustat drug product for commercial purposes. Pursuant to the
WuXi STA DP Agreement, the Company will provide rolling forecasts to WuXi STA on a quarterly basis, or the WuXi STA DP Forecast. Each WuXi STA
DP Forecast will reflect the quantities of vadadustat drug product that the Company expects to order from WuXi STA over a certain number of months,
represented as a quantity of vadadustat drug product per calendar quarter. Pursuant to the WuXi STA DP Agreement, the Company has agreed to purchase a
certain percentage of global demand for vadadustat drug product from WuXi STA. The parties have agreed to a volume-based pricing structure under the
WuXi STA DP Agreement. The vadadustat drug product price will remain fixed for the first 12 months and thereafter shall be annually reviewed by the
Company and WuXi STA. The Company will also reimburse WuXi STA for certain reasonable expenses. The WuXi STA DP Agreement has an initial term
of four years, beginning February 10, 2021 and ending February 10, 2025. The WuXi STA DP Agreement may be renewed or extended by mutual
agreement of the Company and WuXi STA with at least 18 months’ prior written notice. The WuXi STA DP Agreement allows the Company to terminate
the relationship on 180 calendar days’ prior written notice to WuXi STA for any reason. In addition, each party has the ability to terminate the WuXi STA
DP Agreement upon the occurrence of certain conditions.

Other Third Party Contracts

The Company contracts with various organizations to conduct research and development activities with remaining contract costs to the Company of
approximately $90.2 million at December 31, 2022. The scope of the services under these research and development contracts can be modified and the
contracts cancelled by the Company upon written notice. In some instances, the contracts may be cancelled by the third party upon written notice.

Litigation and Related Matters

From time to time, the Company may become subject to legal proceedings and claims which arise in the ordinary course of its business. Consistent with
ASC 450, Contingencies, the Company’s policy is to record a liability if a loss in a significant legal dispute is considered probable and an amount can be
reasonably estimated. The Company provides disclosure when a loss in excess of any reserve is reasonably possible, and if estimable, the Company
discloses the potential loss or range of possible loss. Significant judgment is required to assess the likelihood of various potential outcomes and the
quantification of loss in those scenarios. The Company’s estimates change as litigation progresses and new information comes to light. Changes in
Company estimates could have a material impact on the Company’s results and financial position. As of December 31, 2022, the Company does not have
any significant legal disputes that require a loss liability to be recorded. The Company continually monitors the need for a loss liability for litigation and
related matters.

168

16. Net Loss per Share

The shares in the table below were excluded from the calculation of diluted net loss per share, prior to the use of the treasury stock method, due to their
anti-dilutive effect:

Warrants
Outstanding stock options
Unvested restricted stock units

Total

17 Subsequent Events

Year ended December 31,

2022

— 
11,326,090 
6,081,137 
17,407,227 

2021

509,611 
11,398,215 
4,667,003 
16,574,829 

2020

509,611 
9,386,517 
4,722,311 
14,618,439 

On February 28, 2023, the Company and Siegfried entered into Amendment No. 5 to the Siegfried Agreement, or the Amendment. Pursuant to the
Amendment, the Company has agreed to purchase a minimum quantity of drug substance for Auryxia at a predetermined price. As a result of the
Amendment, the term of the Siegfried Agreement expires on December 31, 2024, subject to the Company's option to extend through December 31, 2026 by
providing 12 months' prior written notice to Siegfried.

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

Management’s Evaluation of our Disclosure Controls and Procedures

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed in the reports that we file or submit
under the Exchange Act is (1) recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms and
(2) accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, to allow timely decisions
regarding required disclosure.

As of December 31, 2022, our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness
of our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act. Our management recognizes that any
controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives, and management
necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Our Chief Executive Officer and Chief
Financial Officer have concluded based upon the evaluation described below that, as of December 31, 2022, our disclosure controls and procedures were
effective at the reasonable assurance level.

Management’s Annual Report on Internal Control over Financial Reporting

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, is responsible for establishing and maintaining
adequate internal control over financial reporting. Internal control over financial reporting is defined in Rule 13a-15(f) or 15d-15(f) promulgated under the
Securities Exchange Act of 1934 as a process designed by, or under the supervision of, the Company’s Chief Executive Officer and Chief Financial Officer
and effected by the Company’s board of directors, management and other personnel to provide reasonable assurance regarding the reliability of our
financial reporting and the preparation of financial statements for external purposes in accordance with accounting principles generally accepted in the
United States of America and includes those policies and procedures that:

(1) Pertain to the maintenance of records that in reasonable detail accurately and fairly reflect the transactions and dispositions of the assets; 

(2) Provide reasonable assurance that transactions are recorded as necessary to permit preparation of consolidated financial statements in accordance

with generally accepted accounting principles, and that receipts and expenditures of the issuer are being made only in accordance with
authorizations of management and directors; and 

(3) Provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the Company's assets that

could have a material effect on the Company’s consolidated financial statements.

169

 
 
 
 
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of
effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of
compliance with policies or procedures may deteriorate.

Management conducted an assessment of the effectiveness of our internal control over financial reporting as of December 31, 2022 based on the criteria set
forth in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, or COSO.
Based on the assessment, management has concluded that our internal control over financial reporting was effective as of December 31, 2022.

Remediation of Previously Identified Material Weakness

As disclosed in our 2021 Annual Report on Form 10-K, management identified a material weakness in our internal control over financial reporting relating
to our inventory process. Management is committed to maintaining a strong internal control environment. In response to the material weakness identified,
management, with the oversight of the Audit Committee of the Board of Directors, took comprehensive actions to remediate the material weakness in
internal control over financial reporting relating to our inventory process, including; (i) designing and implementing more robust controls throughout 2022,
including through increased training of individuals within the supply chain, manufacturing, quality and inventory processes, including review
documentation requirements, (ii) designing controls to address the completeness and accuracy of key reports utilized in the execution of internal controls,
(iii) implementing an inventory count policy and standard operating procedures to ensure consistency and accuracy of the inventory count process and
adherence to these policies at facilities managed by third party logistics and contract manufacturing organizations, and (iv) continuing to engage an outside
firm in 2022 to assist management with performing sufficient testing throughout the year to validate the operating effectiveness of certain controls over
financial reporting. The remediation efforts addressed the material weakness and also enhanced our overall financial reporting control environment. As of
December 31, 2022, we have determined that our previously reported material weakness has been remediated.

Changes in Internal Control over Financial Reporting

Except for the remediation efforts as noted in the preceding paragraphs, there have been no changes in the Company’s internal control over financial
reporting during the fourth quarter of 2022, as such term is defined in Rules 13a-15(f) and 15(d)-15(f) promulgated under the Exchange Act, that have
materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Ernst & Young, LLP, the Company’s independent registered public accounting firm, has issued an auditor’s report on management’s assessment of the
effectiveness of the Company’s internal control over financial reporting as of December 31, 2022. This report is included below.

Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Akebia Therapeutics, Inc.

Opinion on Internal Control Over Financial Reporting

We have audited Akebia Therapeutics, Inc.’s internal control over financial reporting as of December 31, 2022, based on criteria established in Internal
Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO
criteria). In our opinion, Akebia Therapeutics, Inc. (the “Company”) maintained, in all material respects, effective internal control over financial reporting
as of December 31, 2022, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated
balance sheets of the Company as of December 31, 2022 and 2021, the related consolidated statements of operations and comprehensive loss, stockholders’
equity and cash flows for each of the three years in the period ended December 31, 2022, and the related notes and our report dated March 10, 2023
expressed an unqualified opinion thereon.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of
internal control over financial reporting included in the accompanying Management’s Annual

170

 
 
 
 
 
Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting
based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in
accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable
assurance about whether effective internal control over financial reporting was maintained in all material respects.

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and
evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered
necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting
and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control
over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly
reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit
preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are
being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding
prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial
statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of
effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of
compliance with the policies or procedures may deteriorate.

/s/ Ernst & Young LLP

Boston, Massachusetts
March 10, 2023

Item 9B. Other Information

We confirm that we do not hold any deposits or securities or maintain any accounts at Silicon Valley Bank.

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

Not applicable.

PART III

Item 10. Director, Executive Officers and Corporate Governance

The information required by this Item 10 will be included in our Definitive Proxy Statement to be filed with the Securities and Exchange Commission, or
SEC, with respect to our 2023 Annual Meeting of Stockholders and is incorporated herein by reference.

Item 11. Executive Compensation

The information required by this Item 11 will be included in our Definitive Proxy Statement to be filed with the SEC with respect to our 2023 Annual
Meeting of Stockholders and, other than the information required by Item 402(v) of Regulation S-K, is incorporated herein by reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The information required by this Item 12 will be included in our Definitive Proxy Statement to be filed with the SEC with respect to our 2023 Annual
Meeting of Stockholders and is incorporated herein by reference.

171

 
 
 
 
 
Item 13. Certain Relationships and Related Transactions, and Director Independence

The information required by this Item 13 will be included in our Definitive Proxy Statement to be filed with the SEC with respect to our 2023 Annual
Meeting of Stockholders and is incorporated herein by reference.

Item 14. Principal Accountant Fees and Services

The information required by this Item 14 will be included in our Definitive Proxy Statement to be filed with the SEC with respect to our 2023 Annual
Meeting of Stockholders and is incorporated herein by reference.

172

PART IV

Item 15. Exhibits and Financial Statement Schedules

(a) Documents filed as part of this Annual Report on Form 10-K.
(b) Consolidated Financial Statements

Report of Independent Registered Public Accounting Firm

Consolidated Balance Sheets

Consolidated Statements of Operations and Comprehensive Loss

Consolidated Statements of Stockholders’ Equity

Consolidated Statements of Cash Flows

Notes to Consolidated Financial Statements

(2) Schedules

Schedules have been omitted as all required information has been disclosed in the financial statements and related footnotes.

(3) Exhibits

The Exhibits listed below are filed as part of this Annual Report on Form 10-K.

173

 
 
 
 
Exhibit
Number

2.1**

2.2

3.1

3.2

3.3

4.1

4.2

4.3#

4.4#

4.5!

4.6

10.1†

10.2

10.3

10.4

10.5

Description of Exhibit

Agreement and Plan of Merger, dated as of June 28, 2018, by and among Akebia Therapeutics, Inc., Alpha Therapeutics Merger Sub,
Inc., and Keryx Biopharmaceuticals, Inc. (incorporated by reference to Exhibit 2.1 to the Company’s Current Report on Form 8-K
(001-36352), filed on June 28, 2018)

First Amendment to Agreement and Plan of Merger, dated as of October 1, 2018, by and among Akebia Therapeutics, Inc., Alpha
Therapeutics Merger Sub, Inc. and Keryx Biopharmaceuticals, Inc. (incorporated by reference to Exhibit 2.1 to the Company’s
Current Report on Form 8-K (001-36352), filed on October 1, 2018)

Ninth Amended and Restated Certificate of Incorporation (incorporated by reference to Exhibit 3.1 to the Company’s Current Report
on Form 8-K (001-36352), filed on March 28, 2014)

Certificate of Amendment of Ninth Amended and Restated Certificate of Incorporation of Akebia Therapeutics, Inc. (incorporated by
reference to Exhibit 3.1 to the Company's Current Report on Form 8-K (001-36352), filed on June 9, 2020)

Amended and Restated Bylaws (incorporated by reference to Exhibit 3.2 to the Company’s Current Report on Form 8-K (001-
36352), filed on March 28, 2014)

Form of Common Stock Certificate (incorporated by reference to Exhibit 4.1 to the Company’s Registration Statement on Form S-
1/A (333-193969), filed on March 4, 2014)

Fourth Amended and Restated Investors’ Rights Agreement, dated March 5, 2014 (incorporated by reference to Exhibit 4.4 to the
Company’s Annual Report on Form 10-K (001-36352), filed on March 4, 2015)

Amendment No. 1 to Fourth Amended and Restated Investors’ Rights Agreement, dated June 28, 2017 (incorporated by reference to
Exhibit 4.5 to the Company’s Annual Report on Form 10-K (001-36352), filed on March 12, 2018)

Investment Agreement between Akebia Therapeutics, Inc. and Vifor (International) Ltd., dated May 12, 2017 (incorporated by
reference to Exhibit 4.1 to the Company’s Quarterly Report on Form 10-Q (001-36352), filed on August 8, 2017)

Investment Agreement between Akebia Therapeutics, Inc. and Vifor (International) Ltd., dated February 18, 2022 (incorporated by
reference to Exhibit 4.5 to the Company's Annual Report on Form 10-K (001-36352), filed on March 1, 2022)

Description of Registrant’s Securities (incorporated by reference to Exhibit 4.6 to the Company's Annual Report on Form 10-K (001-
36352), filed on February 25, 2021)

Form of Director and Officer Indemnification Agreement (incorporated by reference to Exhibit 10.1 to the Company’s Annual Report
on Form 10-K (001-36352), filed on March 12, 2018)

Office Lease Agreement Between MA-Riverview/245 First Street, L.L.C. and Akebia Therapeutics, Inc., dated December 3, 2013
(incorporated by reference to Exhibit 10.2 to the Company’s Registration Statement on Form S-1 (333-193969), filed on February 14,
2014)

First Amendment to Office Lease Agreement Between Jamestown Premier 245 First, LLC and Akebia Therapeutics, Inc., dated
December 15, 2014 (incorporated by reference to Exhibit 10.3 to the Company’s Annual Report on Form 10-K (001-36352), filed on
March 4, 2015)

Second Amendment to Office Lease Agreement Between Jamestown Premier 245 First, LLC and Akebia Therapeutics, Inc., dated
November 23, 2015 (incorporated by reference to Exhibit 10.4 to the Company’s Annual Report on Form 10-K (001-36352), filed on
March 14, 2016)

Third Amendment to Office Lease Agreement Between Jamestown Premier 245 First, LLC and Akebia Therapeutics, Inc., dated July
25, 2016 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q (001-36352), filed on
November 9, 2016)

174

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit
Number
10.6

10.7

10.8

10.9

10.10

10.11

10.12

10.13†

10.14†

10.15†

10.16†

10.17†

10.18†

10.19†

10.20†

10.21†

10.22†

Description of Exhibit
Fourth Amendment to Office Lease Agreement Between CLPF-Cambridge Science Center, LLC and Akebia Therapeutics, Inc.,
dated May 1, 2017 (incorporated by reference to Exhibit 10.6 to the Company’s Annual Report on Form 10-K (001-36352), filed on
March 12, 2018)

Fifth Amendment to Office Lease Agreement Between CLPF-Cambridge Science Center, LLC and Akebia Therapeutics, Inc. dated
April 9, 2018 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q (001-36352), filed on
August 8, 2018)

Sixth Amendment to Office Lease Agreement Between CLPF-Cambridge Science Center, LLC and Akebia Therapeutics, Inc. dated
November 30, 2020 (incorporated by reference to Exhibit 10.8 to the Company's Annual Report on Form 10-K (001-36352), filed on
February 25, 2021)

One Marina Park Drive Office Lease dated April 29, 2015, by and between Keryx Biopharmaceuticals, Inc. and Fallon Cornerstone
One MPD LLC (incorporated by reference to Exhibit 10.29 to Keryx Biopharmaceuticals, Inc.’s Annual Report on Form 10-K (000-
30929), filed on March 1, 2017)

First Amendment to One Marina Park Drive Office Lease, dated February 24, 2022, by and between Keryx Biopharmaceuticals, Inc.
and CLPF One Marina Park Drive LLC (successor-in-interest to Fallon Cornerstone One MPD LLC) (incorporated by reference to
Exhibit 10.10 to the Company's Annual Report on Form 10-K (001-36352), filed on March 1, 2022)

Assignment and Assumption Agreement, dated February 24, 2022, by and between Keryx Biopharmaceuticals, Inc. and Akebia
Therapeutics, Inc. (incorporated by reference to Exhibit 10.11 to the Company's Annual Report on Form 10-K (001-36352), filed on
March 1, 2022)

Sublease, dated as of September 9, 2019, by and between Keryx Biopharmaceuticals, Inc. and Foundation Medicine, Inc.
(incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q (001-36352), filed on November 12,
2019)

Amended and Restated 2008 Equity Incentive Plan (incorporated by reference to Exhibit 10.5 to the Company’s Registration
Statement on Form S-1 (333-193969), filed on February 14, 2014)

Amendment No. 1 to Amended and Restated 2008 Equity Incentive Plan (incorporated by reference to Exhibit 10.6 to the Company’s
Registration Statement on Form S-1 (333-193969), filed on February 14, 2014)

Executive Employment Agreement with John P. Butler, dated September 16, 2013 (incorporated by reference to Exhibit 10.7 to the
Company’s Registration Statement on Form S-1 (333-193969), filed on February 14, 2014)

Offer Letter to David Spellman, dated as of June 13, 2020 (incorporated by reference to Exhibit 10.1 to the Company's Quarterly
Report on Form 10-Q (001-36352), filed on August 10, 2020)

Form of Non-Statutory Stock Option Agreement for officers (incorporated by reference to Exhibit 10.24 to the Company’s
Registration Statement on Form S-1/A (333-193969), filed on March 4, 2014)

Form of Non-Statutory Stock Option Agreement for Non-Employee Directors (incorporated by reference to Exhibit 10.25 to the
Company’s Registration Statement on Form S-1/A (333-193969), filed on March 4, 2014)

Non-Employee Director Compensation Program, effective January 26, 2021 (incorporated by reference to Exhibit 10.19 to the
Company's Annual Report on Form 10-K (001-36352), filed on February 25, 2021)

Form of Executive Severance Agreement for officers (incorporated by reference to Exhibit 10.27 to the Company’s Registration
Statement on Form S-1/A (333-193969), filed on March 4, 2014)

2014 Incentive Plan (incorporated by reference to Exhibit 10.29 to the Company’s Registration Statement on Form S-1/A (333-
193969), filed on March 4, 2014)

Amendment No. 1 to the Akebia Therapeutics, Inc. 2014 Incentive Plan (incorporated by reference to Exhibit 4.4 to the Company’s
Registration Statement on Form S-8 (333-229366), filed on January 25, 2019)

175

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit
Number

10.23†

10.24†

10.25†

10.26†

10.27†

10.28†

10.29†

10.30†

10.31†

10.32†

10.33†!

10.34†

10.35†

10.36†

10.37†

Description of Exhibit

Amended and Restated 2014 Employee Stock Purchase Plan (incorporated by reference to Appendix A to the Company’s Definitive
Proxy Statement on Schedule 14A (001-36352), filed with the Securities and Exchange Commission on April 26, 2019)

Amended and Restated Cash Incentive Plan, effective January 19, 2022 (incorporated by reference to Exhibit 10.28 to the Company's
Annual Report on Form 10-K (001-36352), filed on March 1, 2022)

Form of Officer Restricted Stock Unit Award Agreement under 2014 Incentive Plan (incorporated by reference to Exhibit 10.18 to
the Company’s Annual Report on Form 10-K (001-36352), filed on March 12, 2018)

Form of Officer Restricted Stock Unit Award Agreement under 2014 Incentive Plan (incorporated by reference to Exhibit 10.29 to
the Company’s Annual Report on Form 10-K (001-36352), filed on March 26, 2019)

Form of Officer Inducement Award Non-Statutory Stock Option Agreement (incorporated by reference to Exhibit 4.4 to the
Company’s Registration Statement on Form S-8 (333-222728), filed on January 26, 2018)

Form of Inducement Award Non-Statutory Stock Option Agreement for non-officers (incorporated by reference to Exhibit 4.5 to the
Company’s Registration Statement on Form S-8 (333-222728), filed on January 26, 2018)

Form of Officer Performance-Based Stock Option Award, under the Company's 2014 Incentive Plan, as amended (incorporated by
reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q (001-36352), filed on November 4, 2021)

Form of Officer Performance-Based Stock Restricted Stock Unit Award, under the Company's 2014 Incentive Plan, as amended
(incorporated by reference to Exhibit 10.2 to the Company's Quarterly Report on Form 10-Q (001-36352), filed on November 4,
2021)

Form of Officer Restricted Stock Unit Award Agreement under 2014 Incentive Plan (Retention Awards) (incorporated by reference to
Exhibit 10.6 to the Company’s Quarterly Report on Form 10-Q (001-36352), filed on August 4, 2022)

Form of Officer Non-Statutory Stock Option Agreement under 2014 Incentive Plan (Retention Awards) (incorporated by reference to
Exhibit 10.7 to the Company’s Quarterly Report on Form 10-Q (001-36352), filed on August 4, 2022)

Form of Officer Cash Bonus Letter Agreement (incorporated by reference to Exhibit 10.3 to the Company's Quarterly Report on
Form 10-Q (001-36352), filed on November 4, 2021)

Keryx Biopharmaceuticals, Inc. 1999 Stock Option Plan (incorporated by reference to Exhibit 10.2 to Keryx Biopharmaceuticals,
Inc.’s Quarterly Report on Form 10-Q (001-30929), filed on March 21, 2003)

Keryx Biopharmaceuticals, Inc. 2004 Long-Term Incentive Plan (incorporated by reference to Annex C to Keryx
Biopharmaceuticals, Inc.’s Definitive Proxy Statement on Schedule 14A (000-30929), filed on April 29, 2004)

Amendment to the Keryx Biopharmaceuticals, Inc. 2004 Long-Term Incentive Plan dated April 11, 2006 (incorporated by reference
to Exhibit 10.1 to Keryx Biopharmaceuticals, Inc.’s Quarterly Report on Form 10-Q (000-30929), filed on August 9, 2006)

Keryx Biopharmaceuticals, Inc. 2007 Incentive Plan, (incorporated by reference to Annex D to Keryx Biopharmaceuticals, Inc.’s
Definitive Proxy Statement on Schedule 14A (000-30929), filed on April 30, 2007)

176

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit
Number
10.38†

10.39†

10.40†

10.41†

10.42†

10.43†

10.44†

10.45†

10.46†!

10.47†!

10.48†

10.49†

10.50#

10.51!

10.52#

Description of Exhibit
Keryx Biopharmaceuticals, Inc. Amended and Restated 2013 Incentive Plan (incorporated by reference to Exhibit 10.1 to Keryx
Biopharmaceuticals, Inc.’s Current Report on Form 8-K (000-30929), filed on May 27, 2016)

Keryx Biopharmaceuticals, Inc. 2018 Equity Incentive Plan (incorporated by reference to Exhibit 99.1 to Keryx Biopharmaceuticals,
Inc.’s Registration Statement on Form S-8 (333-226005), filed on June 29, 2018)

Form of Indemnification Agreement between Keryx Biopharmaceuticals, Inc. and its directors and officers (incorporated by
reference to Exhibit 10.1 to Keryx Biopharmaceuticals, Inc.’s Quarterly Report on Form 10-Q (000-30929), filed on November 9,
2016)

Form of Employee Agreement (Confidentiality, Non-Competition, Non-Solicitation and Development Agreement) applicable to
officers (incorporated by reference to Exhibit 10.56 to the Company’s Annual Report on Form 10-K (001-36352), filed on March 26,
2019)

Keryx Biopharmaceuticals, Inc. Fourth Amended and Restated Directors Equity Compensation Plan (incorporated by reference to
Exhibit 10.2 to Keryx Biopharmaceuticals, Inc.’s Current Report on Form 8-K (000-30929), filed on May 27, 2016)

Keryx Biopharmaceuticals, Inc. Third Amended and Restated Directors Equity Compensation Plan (incorporated by reference to
Exhibit 10.1 to Keryx Biopharmaceuticals, Inc.’s Quarterly Report on Form 10-Q (000-30929), filed on August 7, 2014)

Keryx Biopharmaceuticals, Inc. Director Non-Statutory Stock Option Award Terms and Conditions under the Third Amended and
Restated Directors Equity Compensation Plan (incorporated by reference to Exhibit 10.59 to the Company’s Annual Report on Form
10-K (001-36352), filed on March 26, 2019)

Form of Officer Retention Letter Agreement (incorporated by reference to Exhibit 10.6 to the Company’s Quarterly Report on Form
10-Q (001-36352), filed on May 9, 2022)

Form of Retention and Separation Agreement for Michel Dahan and Nicole R. Hadas (incorporated by reference to Exhibit 10.7 to
the Company’s Quarterly Report on Form 10-Q (001-36352), filed on May 9, 2022)

Form of Amendment to Retention and Separation Agreement for Michel Dahan and Nicole R. Hadas (incorporated by reference to
Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q (001-36352), filed on November 3, 2022)

Separation Agreement with Dell Faulkingham, dated May 5, 2022 (incorporated by reference to Exhibit 10.8 to the Company’s
Quarterly Report on Form 10-Q (001-36352), filed on May 9, 2022)

Retention Agreement with David Spellman, dated June 22, 2022 (incorporated by reference to Exhibit 10.5 to the Company’s
Quarterly Report on Form 10-Q (001-36352), filed on August 4, 2022)

Master Services Agreement, between Akebia Therapeutics, Inc., and Quintiles, Inc., dated as of June 8, 2015 (incorporated by
reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q (001-36352), filed on August 11, 2015)

Collaboration Agreement between Akebia Therapeutics, Inc. and Mitsubishi Tanabe Pharma Corporation, dated December 11, 2015
(incorporated by reference to Exhibit 10.49 to the Company's Annual Report on Form 10-K (001-36352), filed on March 1, 2022)

Letter Agreement between Akebia Therapeutics, Inc. and Mitsubishi Tanabe Pharma Corporation, dated September 26, 2017
(incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q (001-36352), filed on November 8,
2017)

10.53!*

Amendment No. 1 to Collaboration Agreement, dated December 2, 2022, by and between Akebia Therapeutics, Inc. and Mitsubishi
Tanabe Pharma Corporation

177

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit
Number
10.54#

10.55#

10.56!

10.57!

10.58

10.59!

10.60#

10.61!

10.62#

10.63#

10.64

10.65

10.66!

10.67

Description of Exhibit
Collaboration and License Agreement, between Akebia Therapeutics, Inc. and Otsuka Pharmaceutical Co. Ltd., dated December 18,
2016 (incorporated by reference to Exhibit 10.26 to the Company’s Annual Report on Form 10-K (001-36352) and filed on March 6,
2017)

Collaboration and License Agreement between Akebia Therapeutics, Inc. and Otsuka Pharmaceutical Co. Ltd., dated April 25, 2017
(incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q (001-36352), filed on August 8, 2017)

Termination and Settlement Agreement, dated June 30, 2022, by and between the Company and Otsuka Pharmaceutical Co. Ltd
(incorporated by reference to Exhibit 10.8 to the Company’s Quarterly Report on Form 10-Q (001-36352), filed on August 4, 2022)

Second Amended and Restated License Agreement, dated February 18, 2022, by and between Akebia Therapeutics, Inc. and Vifor
(International) Ltd. (incorporated by reference to Exhibit 10.54 to the Company's Annual Report on Form 10-K (001-36352), filed on
March 1, 2022)

Open Market Sale Agreement
reference to Exhibit 1.1 to the Company’s Current Report on Form 8-K (001-36352), filed on April 7, 2022)

, dated April 7, 2022, by and between Akebia Therapeutics, Inc. and Jefferies LLC (incorporated by

SM

Second Amended and Restated License Agreement dated April 17, 2019, by and between Akebia Therapeutics, Inc. and Panion &
BF Biotech, Inc. (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q (001-36352), filed on
August 8, 2019)

Amended and Restated Sub-License Agreement, dated June 8, 2009, as amended by the First Amendment thereto, dated June 12,
2013, by and between Keryx Biopharmaceuticals, Inc., Japan Tobacco, Inc. and Torii Pharmaceutical Co., Ltd (incorporated by
reference to Exhibit 10.1 to Keryx Biopharmaceuticals, Inc.’s Quarterly Report on Form 10-Q (000-30929), filed on November 7,
2017)

Master Manufacturing Services Agreement by and between Keryx Biopharmaceuticals, Inc. and Patheon Manufacturing Services
LLC and certain of its affiliates, dated September 27, 2016, and related Product Agreement dated September 27, 2016, and related
Product Agreement dated October 12, 2016 (incorporated by reference to Exhibit 10.58 to the Company's Annual Report on Form
10-K (001-36352), filed on March 1, 2022)

Product Agreement, dated August 29, 2017, by and between Keryx Biopharmaceuticals, Inc. and Patheon Inc. (an affiliate of Patheon
Manufacturing Services LLC) related to the Master Manufacturing Services Agreement by and between Keryx Biopharmaceuticals,
Inc. and Patheon Manufacturing Services LLC and certain of its affiliates dated November 12, 2016 (incorporated by reference to
Exhibit 10.2 to Keryx Biopharmaceuticals, Inc.’s Quarterly Report on Form 10-Q (000-30929), filed on November 7, 2017)

Master Manufacturing Services and Supply Agreement, dated December 20, 2017, by and between Keryx Biopharmaceuticals, Inc.
and Siegfried Evionnaz SA (incorporated by reference to Exhibit 10.13 to Keryx Biopharmaceuticals, Inc.’s Annual Report on Form
10-K (000-30929), filed on February 21, 2018)

Amendment No. 1 to Master Manufacturing Services and Supply Agreement, dated as of December 21, 2020, by and between
Siegfried Evionnaz SA and Keryx Biopharmaceuticals, Inc. (incorporated by reference to Exhibit 10.58 to the Company's Annual
Report on Form 10-K (001-36352), filed on February 25, 2021)

Amendment No. 2 to Master Manufacturing Services and Supply Agreement, dated as of January 29, 2021, by and between Siegfried
Evionnaz SA and Keryx Biopharmaceuticals, Inc. (incorporated by reference to Exhibit 10.58 to the Company's Annual Report on
Form 10-K (001-36352), filed on February 25, 2021)

Amendment No. 3 to Master Manufacturing Services and Supply Agreement, dated as of February 11, 2021, by and between
Siegfried Evionnaz SA and Keryx Biopharmaceuticals, Inc. (incorporated by reference to Exhibit 10.59 to the Company's Annual
Report on Form 10-K (001-36352), filed on February 25, 2021)

Amendment No. 4 to Master Manufacturing Services and Supply Agreement, dated as of December 17, 2021, by and between
Siegfried Evionnaz SA and Keryx Biopharmaceuticals, Inc. (incorporated by reference to Exhibit 10.64 to the Company's Annual
Report on Form 10-K (001-36352), filed on March 1, 2022)

178

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit
Number
10.68#

10.69#

Description of Exhibit
Exclusive Distribution Agreement between Keryx Biopharmaceuticals, Inc. and Cardinal Health 105, Inc., dated October 16, 2014
and First Amendment to Exclusive Distribution Agreement between Keryx Biopharmaceuticals, Inc. and Cardinal Health 105, Inc.,
dated April 14, 2015 (incorporated by reference to Exhibit 10.60 to the Company’s Annual Report on Form 10-K (001-36352), filed
on March 26, 2019)

Manufacture and Supply Agreement between Keryx Biopharmaceuticals, Inc. and BioVectra Inc., dated May 26, 2017 and
Amendment to Manufacture and Supply Agreement between Keryx Biopharmaceuticals, Inc. and BioVectra Inc., dated December 11,
2017 (incorporated by reference to Exhibit 10.61 to the Company’s Annual Report on Form 10-K (001-36352), filed on March 26,
2019)

 10.70!*

Termination and Settlement Agreement, dated December 22, 2022, by and between Keryx Biopharmaceuticals, Inc. and BioVectra
Inc.

10.71!

10.72!

10.73!

10.74!

10.75!

10.76!

10.77!

10.78!

10.79!

10.80!

10.81!*

21.1

Loan Agreement, dated November 11, 2019, by and among the Company, Keryx Biopharmaceuticals, Inc., Biopharma Credit plc and
Biopharma Credit Investments V (Master) LP (incorporated by reference to Exhibit 10.62 to the Company's Annual Report on Form
10-K (001-36352), filed on March 12, 2020)

First Amendment and Waiver, dated February 18, 2022, by and among the Company, Biopharma Credit plc, BCPR Limited
Partnership and Biopharma Credit Investments V (Master) LP (incorporated by reference to Exhibit 10.69 to the Company's Annual
Report on Form 10-K (001-36352), filed on March 1, 2022)

Second Amendment and Waiver, dated July 15, 2022, by and among the Company, Biopharma Credit plc, BCPR Limited Partnership
and Biopharma Credit Investments V (Master) LP (incorporated by reference to Exhibit 10.9 to the Company’s Quarterly Report on
Form 10-Q (001-36352), filed on August 4, 2022)

Guaranty and Security Agreement, dated November 25, 2019, by and between the Company, Keryx Biopharmaceuticals, Inc. and
Biopharma Credit plc (incorporated by reference to Exhibit 10.63 to the Company's Annual Report on Form 10-K (001-36352), filed
on March 12, 2020)

Supply Agreement, dated as of March 11, 2020, by and between Akebia Therapeutics, Inc. and Patheon, Inc. (incorporated by
reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q (001-36352), filed on May 5, 2020)

Supply Agreement, dated as of April 2, 2020, by and between Akebia Therapeutics, Inc. and STA Pharmaceutical Hong Kong
Limited (incorporated by reference to Exhibit 10.2 to the Company's Quarterly Report on Form 10-Q (001-36352), filed on August
10, 2020)

Amendment #1 to the Supply Agreement, dated as of April 15, 2021, by and between Akebia Therapeutics, Inc, and STA
Pharmaceutical Hong Kong Limited (incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q
(001-36352), filed on August 5, 2021)

Amended and Restated Product Manufacture and Supply and Facility Construction Agreement between BioVectra, Inc. and Keryx
Biopharmaceuticals, Inc., dated September 4, 2020 (incorporated by reference to Exhibit 10.1 to the Company's Current Report on
Form 8-K (001-36352), filed on September 11, 2020)

Supply Agreement, dated February 10, 2021, by and between the Company and STA Pharmaceutical Hong Kong Limited
(incorporated by reference to Exhibit 10.4 to the Company's Quarterly Report on Form 10-Q (001-36352), filed on May 10, 2021)

Royalty Interest Acquisition Agreement, dated February 25, 2021, by and between the Company and HealthCare Royalty Partners IV,
L.P. (incorporated by reference to Exhibit 10.5 to the Company's Quarterly Report on Form 10-Q (001-36352), filed on May 10,
2021)

License Agreement, dated December 22, 2022, by and among Akebia Therapeutics, Inc., Keryx Biopharmaceuticals, Inc. and Averoa
SAS

List of Subsidiaries (incorporated by reference to Exhibit 21.1 to the Company's Annual Report on Form 10-K (001-36352), filed on
February 25, 2021)

179

 
 
 
 
 
 
 
 
 
 
 
 
 
    
    
 
Exhibit
Number
23.1*

31.1*

31.2*

32.1*

Description of Exhibit
Consent of Ernst & Young LLP

Certification of Principal Executive Officer Required Under Rule 13a-14(a) of the Securities Exchange Act of 1934, as amended

Certification of Principal Financial Officer Required Under Rule 13a-14(a) of the Securities Exchange Act of 1934, as amended

Certification of Principal Executive Officer and Principal Financial Officer Required Under Rule 13a-14(b) of the Securities
Exchange Act of 1934, as amended, and 18 U.S.C. 1350

101.INS*

Inline XBRL Instance Document (the instance document does not appear in the Interactive Data File because XBRL tags are
embedded within the Inline XBRL document)

101.SCH*

Inline XBRL Taxonomy Extension Schema Document

101.CAL*

Inline XBRL Taxonomy Extension Calculation Linkbase Document

101.DEF*

Inline XBRL Taxonomy Extension Definition Linkbase Document

101.LAB*

Inline XBRL Taxonomy Extension Labels Linkbase Document

101.PRE*

Inline XBRL Taxonomy Extension Presentation Linkbase Document

104

Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

* Filed, or submitted electronically, herewith
† Indicates management contract or compensatory plan
# Indicates portions of the exhibit (indicated by asterisks) have been omitted pursuant to a request for confidential treatment
! Indicates portions of the exhibit (indicated by asterisks) have been omitted pursuant to Item 601(b)(10)(iv) of Regulation S-K
** The schedules to the Agreement and Plan of Merger have been omitted pursuant to Item 601(b)(2) of Regulation S-K. The Company will furnish copies of such
schedules to the Securities and Exchange Commission upon request by the Commission

Item 16. Form 10-K Summary

None.

180

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its
behalf by the undersigned thereunto duly authorized.

SIGNATURES

Date: March 10, 2023

AKEBIA THERAPEUTICS, INC.

By:

/s/ John P. Butler 
John P. Butler
President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report was signed by the following persons on behalf of the registrant and in the
capacities and on the date indicated.

Date: March 10, 2023

Date: March 10, 2023

Date: March 10, 2023

Date: March 10, 2023

Date: March 10, 2023

Date: March 10, 2023

Date: March 10, 2023

Date: March 10, 2023

Date: March 10, 2023

By:

By:

By:

By:

By:

/s/ John P. Butler 
John P. Butler
Director, President and Chief Executive Officer
(Principal Executive Officer)

/s/ David A. Spellman
David A. Spellman
Senior Vice President, Chief Financial Officer and
Treasurer (Principal Financial Officer and Principal
Accounting Officer)

/s/ Adrian Adams 
Adrian Adams
Chairperson and Director

/s/ Ron Frieson
Ron Frieson
Director

/s/ Steven C. Gilman 
Steven C. Gilman
Director

By:

/s/ Michael Rogers 

  Michael Rogers

Director

By:

By:

By:

/s/ Cynthia Smith 
Cynthia Smith
Director

/s/ Myles Wolf
Myles Wolf
Director

/s/ LeAnne M. Zumwalt
LeAnne M. Zumwalt
Director

181

 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit 10.53
Certain identified information has been excluded from the exhibit because it is both (i) not material and (ii) is the type of information that the
registrant treats as private or confidential. Double asterisks denote omissions.

AMENDMENT NO.1 TO COLLABORATION AGREEMENT

THIS AMENDMENT NO.1 TO COLLABORATION AGREEMENT (this “Amendment No. 1” ) is effective as of December 2, 2022
(the “Effective Date” ) and made by and between:

Akebia Therapeutics, Inc., a company organized and existing under the laws of the State of Delaware, United States of America,
with its principal offices at 245 First Street, Cambridge, MA 02142, U.S.A. (“Akebia”),

and    

Mitsubishi Tanabe Pharma Corporation, a company organized and existing under the laws of Japan, with its principal offices at 3-
2-10, Dosho-machi, Chuo-ku, Osaka 541-8505, Japan (“Licensee”), on the other hand.

Akebia and Licensee may be referred to herein individually as a “Party” and collectively as the “Parties.”

RECITALS

WHEREAS, the Parties entered into the Collaboration Agreement dated December 11, 2015 (the “Collaboration Agreement ”); and

WHEREAS, the Parties wish to revise, amend or supplement certain provisions of the Collaboration Agreement to provide that Licensee
may procure API of the Licensed Product by contracting with specific contract manufacturing organizations, for the use of Licensee’s
activities permitted under the Collaboration Agreement in the Territory; and

NOW THEREFORE, in consideration of the mutual promises and benefits made and contained herein, the receipt and sufficiency of which
are hereby acknowledged, the Parties hereby agree as follows:

1.
respectively as defined in the Collaboration Agreement.

Unless otherwise expressly provided in this Amendment No.1, all capitalized terms used in this Amendment No.1 have the meaning

2.
and replaced as follows:

Section 7.01 (Manufacture and Supply of Licensed Products) of the Collaboration Agreement is hereby amended in its entity

(a)
Subject to the terms and conditions of this Agreement (as amended) and the associated Supply Agreement made and entered
into as of July 15, 2020 (as amended), Akebia shall continue to manufacture or have manufactured and supply Licensed Product for
clinical and commercial use in the Territory in accordance with GCP and GMP at the same level of diligence [**].

(b)
After First Commercial Sale of the Licensed Product in the Territory, Licensee shall have the right, but not the obligation, to
manufacture (or have its Affiliates manufacture) Licensed Products inside or outside the Territory in tablet form (for clarity, not API)
for use in the Territory; provided, however, that if Licensee chooses to exercise its manufacturing right it shall also [**]. If Licensee
wishes to exercise this right, it shall so notify Akebia, and Licensee and Akebia shall promptly enter into a supply agreement for
Akebia’s supply of API to Licensee, as well as Licensee’s supply of tablets to Akebia. For the avoidance of doubt, Licensee shall not
be permitted to manufacture API of the Licensed Product in or outside the Territory. Upon the execution of a supply agreement, the
Parties will enter into mutually acceptable technology transfer agreement, which shall include the Parties’ respective obligations and
responsibilities relating to matters of technology transfer to enable Licensee to manufacture the tablet form of the Licensed Product
from API, which technology transfer and all costs associated therewith shall be [**]. If Licensee wishes to engage a Third Party to
manufacture Licensed Products pursuant to

Confidential

this Section 7.01(b), Licensee may do so only with Akebia’s prior written consent, not to be unreasonably withheld or delayed, and
all other terms of this Section 7.01(b) shall apply.

(c)
with Akebia and the Parties shall promptly discuss a potential resolution, which may include a [**].

If, at any time during the Term, Licensee reasonably expects that Akebia will be [**], Licensee may request a discussion

(d)
Licensed Product at the following location:

Licensee shall have the right, but not the obligation, to manufacture (or have its Affiliates manufacture) the API of the

[**]; and

For clarity, the foregoing right granted to Licensee under this Section 7.01(b) is limited to the foregoing manufacturing organization,
and Licensee may not manufacture (or have its Affiliates manufacture) the API of the Licensed Product outside of this organization;
provided, that, this Section 7.01(d) shall have not have, or shall not revise, amend, restrict or render ineffective any part of
Licensee’s rights and performance of activities permitted under the provisions of Section 7.01(a) through (c).

(e) Licensee shall have the right, but not the obligation, to develop (or have its Affiliates develop) an alternate manufacturing
pathway [**] for the API of the Licensed Product Vadadustat at the following [**] sites; provided, that, the following list of the
permitted [**] Third Party contractors may be amended to incorporate any additional Third Party contractor upon written agreement
of the Parties:

[**].

For clarity, the treatment of any Inventions or Know-How relating to or arising from Licensee’s activities as provided for under the
provisions of Section 7.01(d) and (e) shall be governed by Article IX of this Agreement, as applicable.

3.
supplement any of terms, conditions, or obligations set forth in the Collaboration Agreement or in any way effect its enforceability.

Except as expressly set forth in this Amendment No. 1, nothing in this Amendment No. 1 shall be construed to revise, amend or

4.
York, United States, exclusive of its conflicts of laws principles.

This Amendment No. 1 and the rights of the Parties hereunder shall be construed under and governed by the laws of the State of New

5.
instrument.

This Amendment No. 1 may be executed in counterparts, all of which taken together shall be regarded as one and the same

[Signature Page Follows:]

2  

Confidential

IN WITNESS WHEREOF, the Parties have freely executed this Amendment No.1 through their duly authorized representatives to be
effective as of the Effective Date.

For and on behalf of:

Akebia Therapeutics, Inc.

By: __/s/ David Spellman________________________________
Name:    David Spellman

Title:    SVP, Chief Financial Officer and Treasurer

Date: 03-Dec-2022 | 9:53 AM EST

For and on behalf of:

Mitsubishi Tanabe Pharma Corporation

By: ___/s/ Atsushi Hashimoto_______________________________
Name:    Atsushi Hashimoto

Title:    Vice President, Head of Business Development Department

Date:    02-Dec-2022 | 12:30 PM JST

3  

CONFIDENTIAL         Execution Version

Exhibit 10.70

Certain identified information has been excluded from the exhibit because it is both (i) not material and (ii) is the type of
information that the registrant treats as private or confidential. Double asterisks denote omissions.

TERMINATION AND SETTLEMENT AGREEMENT

This  termination  and  settlement  agreement  (the  “Termination  Agreement”)  shall  be  effective  as  of  December  22,  2022  (the
“Termination  Effective  Date”)  between  Keryx  Biopharmaceuticals,  Inc.  (“Keryx”),  a  wholly-owned  subsidiary  of  Akebia  Therapeutics,
Inc. (“Akebia”), with a place of business at 245 First Street, Cambridge, Massachusetts, 02142, USA, and BIOVECTRA Inc., with a place of
business at 11 Aviation Avenue, Charlottetown, Prince Edward Island, C1E0A1, Canada (“BIOVECTRA”) to terminate any and all existing
agreements entered into by the parties in connection with the manufacture and supply, by BIOVECTRA to Akebia, of Akebia’s proprietary
active pharmaceutical ingredient, ferric citrate drug substance (the “Product”). Akebia (on behalf of itself and Keryx) and BIOVECTRA are
each referred to individually as a “Party,” and collectively as the “Parties” to this Termination Agreement.

RECITALS

Whereas,  Keryx  and  BIOVECTRA  are  parties  to  certain  agreements,  including  but  not  limited  to  that  certain  Manufacture  and
Supply  Agreement,  as  amended,  dated  as  of  May  26,  2017,  that  certain  Product  Manufacture  and  Supply  and  Facility  Construction
Agreement,  dated  December  11,  2017,  as  amended  and  restated  by  the  First  Amendment  No.  1  to  Product  Manufacture  and  Supply  and
Facility  Construction  Agreement,  dated  April  20,  2018,  as  further  amended  and  restated  by  that  certain  Amended  and  Restated  Product
Manufacture and Supply and Facility Construction Agreement, dated September 4, 2020, and that certain Quality Agreement, dated February
22,  2021,  pursuant  to  which  BIOVECTRA  manufactures  and  supplies  the  Product  to  Akebia  and  builds  a  facility  for  the  manufacture  of
Product (collectively, the “Agreements”);

Whereas, on December 12, 2018, Keryx became a wholly-owned subsidiary of Akebia;

Whereas, Akebia has authority to act on behalf of Keryx;

Whereas, due to business considerations, the Parties have decided to discontinue the manufacture of the Product by BIOVECTRA

and to terminate the Agreements; and

Whereas,  the  Parties  have  agreed  to  terminate  all  agreements  and  contracts  between  the  Parties,  including  but  not  limited  to  the

Agreements, and resolve their disputes with each other concerning the Agreements under the terms and conditions set forth herein.

AGREEMENT

In consideration of the mutual covenants, terms and conditions set forth below, BIOVECTRA and Akebia (on behalf of itself and

Keryx) agree as follows:

1.    Recitals. The recitals set forth above are incorporated by reference and are explicitly made a part of this Termination Agreement.

2.    Defined Terms. Capitalized terms used and not otherwise defined in this Termination
Agreement shall have the meanings assigned to them in the Agreements.

3.    Termination. As consideration for the termination of all Agreements between them, the Parties shall perform the following obligations:

A. Termination  Fees.  The  Parties  have  agreed  that,  in  connection  with  the  termination  of  the  Agreements,  Akebia  shall  pay
BIOVECTRA certain fees, which shall be paid in full by Akebia as set out in Annex No. 1 hereto (together the “Termination Fees”
and each a “Termination Fee Payment”). This payment of Termination Fees shall be in full satisfaction of all payments and

CONFIDENTIAL        

other obligations of Akebia to BIOVECTRA relating to or arising out of, under, or in connection with the Agreements.

B. Akebia Materials. BIOVECTRA disclaims any ownership interest in the lots and retain samples listed in Annex No. 2 hereto (the
“Akebia Materials”). Within [**] after the Termination Effective Date, BIOVECTRA will return the Akebia Materials to Akebia, at
Akebia’s expense, to the location and in a manner as directed by Akebia. Until the Akebia Materials have been transferred to Akebia,
BioVectra  will  maintain  such  Akebia  Materials  in  the  manner  proscribed  under  the  Agreements.  With  respect  to  the  Transferring
Stability Studies (as defined on Annex No. 2), until such transfer to Akebia is effectuated, BioVectra will maintain the ICH compliant
stability programs, including [**].

C. BIOVECTRA Ownership of Equipment, Work in Progress and Raw Materials: Akebia represents and warrants that, other than the
Akebia  Materials,  Akebia  has  no  ownership  interest  in  any  equipment,  work  in  progress,  raw  materials,  consumables,  non-
consumables,  or  materials  obtained  for  the  development  and  manufacture  of  the  Product  that  are  currently  in  the  possession  of
BIOVECTRA  (the  “BIOVECTRA  Equipment  and  Materials”).  BIOVECTRA  may  use  or  dispose  of  all  such  BIOVECTRA
Equipment and Materials as it sees fit.

D. Confidential Information, Keryx Technology, and Improvements:

1. Akebia retains its rights and interests in and with respect to all Keryx Technology, Improvements, and Confidential Information
of Keryx, as those terms are defined, and as those rights and interests are specified, in the Agreements. BIOVECTRA agrees to
abide by all provisions in the Agreements for the return, disposition, or other treatment upon termination of Keryx Technology,
Improvements, and Confidential Information of Keryx, and those obligations of BIOVECTRA shall survive the termination of
the  Agreements.  Within  [**]  of  the  Termination  Effective  Date,  BIOVECTRA  shall  transfer  to  Akebia  all  Records  and
Supporting Documentation as defined in the Agreements, as well as all documentation and copies thereof in BIOVECTRA’s (or
any  of  its  Affiliate’s)  possession,  custody  or  control  relating  to  the  Product,  Quality  Modules,  Specifications  or  Keryx
Technology,  Improvements  and  all  other  Confidential  Information  of  Keryx  with  appropriate  manifest,  including,  without
limitation,  [**];  provided,  however,  that  BIOVECTRA  may  retain  any  documentation  which  it  must  retain  for  such  period  of
time  as  required  by  Applicable  Law,  as  to  which  copies  shall  be  provided  to  Akebia,  and  which  records  BIOVECTRA  must
continue to treat as Confidential Information in accordance with the terms of the Agreements.

2. BIOVECTRA  retains  its  rights  and  interests  with  respect  to  all  Confidential  Information  of  BIOVECTRA,  as  that  term  is
defined,  and  as  those  rights  and  interests  are  specified,  in  the  Agreements.  Akebia  agrees  to  abide  by  all  provisions  in  the
Agreements for the return, disposition, or other treatment upon termination of the Confidential Information of BIOVECTRA.

E. Mutual Release of Claims. Each Party and its direct and indirect parents, subsidiaries, Affiliates, predecessors, successors and assigns
and  their  present  and  former  directors,  officers,  employees,  managers,  stockholders,  investors,  ,  indemnitees,  attorneys,
representatives, licensors, licensees, subrogees, and agents, (collectively the “Releasing Parties”) hereby release the other Party and
its  direct  and  indirect  parents,  subsidiaries,  Affiliates,  predecessors,  successors  and  assigns  and  their  present  and  former  directors,
officers, employees, managers, stockholders, investors, indemnitees, attorneys, representatives, licensors, licensees, subrogees, and
agents (collectively the “Released Parties”) from any and all past, present and future claims, demands, obligations, liabilities and

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CONFIDENTIAL        

causes  of  action  of  any  nature  whatsoever  (“Claims”),  known  or  unknown,  from  the  inception  of  time  through  the  Termination
Effective Date, including but not limited to all Claims relating to or arising out of, under, or in connection with the Agreements or
their termination; provided, however, that neither Party hereby releases the other from any Claims or obligations arising under this
Termination Agreement. The Parties intend for their respective mutual general releases to apply to Claims which they do not
presently know to exist at this time.  The Parties understand that the facts upon which they have based their decision to enter
into this Termination Agreement may hereafter prove to be different from the facts now known or believed by them, and they
hereby accept and assume the risk thereof and agree that this Termination Agreement shall be and shall remain, in all respects,
effective and not subject to termination or rescission by reason of any such difference in facts.

F. Termination of Obligations. Effective upon the Termination Effective Date, the Parties agree to terminate:

a. all open Purchase Orders; in particular, both Parties acknowledge and agree that BIOVECTRA shall be relieved from any
obligations to manufacture any Product or perform any services under any such open Purchase Orders, and Akebia shall be
relieved from any obligation to pay balance of any outstanding invoices related to performance by BIOVECTRA of services
and obligations under the Agreements;

b. all outstanding invoices; in particular, both Parties acknowledge and agree that Akebia shall be relieved from any obligations
to pay any outstanding invoices related to performance by BIOVECTRA of services and obligations under the Agreements;
c. all agreements and contracts between the Parties, including but not limited to the Agreements in their entireties and, more
generally, any commercial relationship between the Parties with the exception of (i) the Parties’ rights and obligations under
this  Termination  Agreement,  and  (ii)  with  respect  to  those  rights  and  obligations  under  the  Agreements  that  survive
termination as set forth in Section 3.D of this Termination Agreement.

G. Product. After receipt of Termination Fee Payment 1 (as set out in Annex No. 1), BIOVECTRA shall promptly destroy or otherwise
dispose of, any remaining inventory of Product, stability lots and retain samples not included in the Akebia Material. BIOVECTRA
is  responsible  for  expenses  related  to  disposal  of  inventory  located  at  BIOVECTRA’s  Facility,  and  Akebia  will  reimburse
BIOVECTRA for costs related to the disposal of inventory located at LSU.

H. Covenant  Not  to  Sue. The  Releasing  Parties  covenant  and  agree  not  to  commence,  aid,  prosecute,  or  cause  to  be  commenced  or
prosecuted any action or other proceeding, based upon any Claims relating to, arising out of, under, or in connection with the matters
subject  to  the  mutual  releases  as  set  forth  herein,  and  the  Releasing  Parties  further  covenant  and  agree  to  hold  harmless  and
indemnify the other Released Parties in respect of all Claims (including, but not limited to, all court costs and reasonable attorneys’
fees), suffered, sustained, incurred, or required to be paid by such other Released Parties from or in connection with any such action
or proceeding.

I. Compromise Agreement. This Termination Agreement is a compromise and settlement of claims and is not intended to be, nor shall

be construed as, any admission of liability or wrongdoing by any Party hereto or any other person or entity.

J. Confidentiality. No public disclosures about the termination of the Agreements, the contents of this Termination Agreement, or the
relationship between the Parties or their predecessors shall be made by either Party without the prior written approval of the other
Party, which approval shall not be unreasonably withheld or delayed, provided; however, that each of the Parties may disclose such
information to its attorneys, accountants, insurers, and auditors who have a need to

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CONFIDENTIAL        

know  such  information  and  who  are  otherwise  bound  by  an  agreement  or  a  professional  duty  of  confidentiality  to  keep  such
information confidential to the same degree as are the Parties. Further, each of the Parties may disclose such information to the extent
necessary to comply with applicable law, or the rules of a stock exchange on which the securities of the disclosing Party are listed (or
to which an application for listing has been submitted). In the event a Party is required by Applicable Law or the rules of a stock
exchange  on  which  its  securities  are  listed  (or  to  which  an  application  for  listing  has  been  submitted)  to  make  such  a  public
disclosure,  such  Party  will  submit  the  proposed  disclosure  in  writing  to  the  other  Party  with  sufficient  opportunity  (to  the  extent
practicable) for the other Party to review and comment on such required disclosure and request confidential treatment thereof or a
protective  order  therefor  if  appropriate.  Neither  Party  will  be  required  to  seek  the  permission  of  the  other  Party  to  repeat  any
information regarding the terms of this Termination Agreement or any amendment hereto or other information of the other Party that
has  already  been  publicly  disclosed  by  such  Party  or  by  the  other  Party,  in  accordance  with  this  Section,  provided  that  such
information remains accurate as of such time.

K. Successors and Assigns. The provisions of this Termination Agreement shall be binding upon and inure to the benefit of the Parties

hereto and their respective successors and assigns.

L. Entire  Agreement.  This  Termination  Agreement  constitutes  the  entire  agreement  between  the  Parties  with  respect  to  the  subject
matter  of  the  Termination  Agreement.  This  Termination  Agreement  supersedes  all  prior  agreements,  whether  written  or  oral,  with
respect  to  the  subject  matter  of  the  Termination  Agreement.  Each  Party  confirms  that  it  is  not  relying  on  any  statements,
representations, warranties or covenants of any person (whether a Party to this Agreement or not) except as specifically set out in this
Termination Agreement. Nothing in this Termination Agreement is intended to limit or exclude any liability for fraud.

M. Counterparts. This Termination Agreement may be executed in two or more counterparts, each of which shall be deemed an original
and  all  of  which  shall  together  be  deemed  to  constitute  one  agreement.  The  Parties  agree  that  execution  of  this  Termination
Agreement by industry standard electronic signature software or by exchanging PDF signatures shall have the same legal force and
effect as the exchange of original signatures, and that in any proceeding arising under or relating to this Termination Agreement, each
party hereby waives any right to raise any defense or waiver based upon execution of this Termination Agreement by means of such
electronic signatures or maintenance of the executed agreement electronically.

N. Jointly Drafted. The terms, provisions and language of this Termination Agreement have been jointly negotiated and drafted by the
Parties and their respective legal counsel. Nothing in this Termination Agreement should be construed or interpreted against any of
the Parties as the drafting Parties, or for any other reason by operation of similar rules of construction.

O. Headings. The headings of the sections, paragraphs and subsections of this Termination Agreement are inserted for convenience of
reference and are not a part of and are not intended to govern, limit, or aid in the construction or interpretation of any term or
provision hereof.

P. Tax Consequences. Each of the Parties are solely responsible for any tax consequences of this Termination Agreement, and none of

the Parties or their representatives has made any representations regarding such tax consequences, if any.

Q. No Waiver. Failure to insist on compliance with any term, covenant or condition contained in this Termination Agreement shall not

be deemed a waiver of that term, covenant or condition, nor

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CONFIDENTIAL        

shall any waiver or relinquishment of any right or power contained in this Termination Agreement at any one time or more times be
deemed a waiver or relinquishment of any right or power at any other time or times.

R. Amendment. This Termination Agreement may not be modified or terminated orally and no modification termination or waiver shall

be valid unless in writing and signed by all of the Parties hereto.

4.    Choice of Law; Jurisdiction and Venue. This Termination Agreement and any claim or controversy directly or indirectly based upon or
arising out of this Termination Agreement (whether based on contract, tort or any other theory), including all matters of construction,
validity  and  performance,  shall  in  all  respects  be  governed  by  and  interpreted,  construed  and  determined  in  accordance  with,  the
internal laws of the State of Delaware (without regard to any conflicts of law provision thereof that would require the application of
the  laws  of  any  other  jurisdiction).  Each  of  the  Parties,  to  the  extent  permitted  by  the  applicable  laws  and  regulations  irrevocably
(i) submits itself to the personal jurisdiction of the State and Federal Courts of the State of Delaware, as well as to the jurisdiction of
all courts to which an appeal may be taken, in any suit, action, or proceeding arising out of or relating to this Termination Agreement,
or any of the transactions contemplated by this Settlement Agreement, including; (ii) agrees that all claims in respect of such suit,
action or proceeding shall be brought, heard and determined exclusively in the State and Federal Courts in the State of Delaware; and
(iii)  agrees not to bring any action or proceeding arising out of or relating to this Termination Agreement or any of the transactions
contemplated by this Termination Agreement in any other court.

5.        Jury  Trial  Waiver.  THE  PARTIES  HEREBY  KNOWINGLY,  VOLUNTARILY,  INTENTIONALLY,  IRREVOCABLY,  AND
UNCONDITIONALLY WAIVE TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW ANY RIGHT THEY
MAY  HAVE  TO  A  TRIAL  BY  JURY  WITH  RESPECT  TO  ANY  ACTION,  SUIT  OR  PROCEEDING  DIRECTLY  OR
INDIRECTLY ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS SETTLEMENT AGREEMENT OR THE
TRANSACTIONS  CONTEMPLATED  HEREBY.  THE  PARTIES  EACH  HEREBY 
(I)  CERTIFY  THAT  NO
REPRESENTATIVE,  AGENT  OR  ATTORNEY  OF  THE  OTHERS  HAS  REPRESENTED,  EXPRESSLY  OR
OTHERWISE,  THAT  SUCH  OTHER  PERSON  WOULD  NOT,  IN  THE  EVENT  OF  ANY  ACTION,  SUIT  OR
PROCEEDING, SEEK TO ENFORCE THE FOREGOING WAIVER AND (II) ACKNOWLEDGES THAT IT HAS BEEN
INDUCED  TO  ENTER  INTO  THIS  AGREEMENT  BY,  AMONG  OTHER  THINGS,  THE  MUTUAL  WAIVERS  AND
CERTIFICATIONS CONTAINED IN THIS SECTION 5.

[Remainder of page intentionally left blank.]

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CONFIDENTIAL        

IN WITNESS WHEREOF, the parties have caused their respective duly authorized representatives to execute this Termination Agreement
effective as of the Termination Effective Date.

BIOVECTRA INC.

KERYX BIOPHARMACEUTICALS, INC., a wholly-owned
subsidiary of AKEBIA THERAPEUTICS, INC.

By: _/s/ Valana Deighan____________

By: /s/ David Spellman________________

Name: Valana Deighan

Title: General Counsel

Name: David Spellman

Title: SVP, Chief Financial Officer and Treasurer

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CONFIDENTIAL        

ANNEX No. 1 – Termination Fees

Termination Fee
Payment

Amount (USD)

Payment Due Date

1.

2.

3.

4.

5.

6.

7.

$17,500,000.00

On the Termination Effective Date

$2,500,000.00

$2,500,000.00

$2,500,000.00

$2,500,000.00

$2,500,000.00

$2,500,000.00

April 5, 2024

July 5, 2024

October 5, 2024

January 5, 2025

April 5, 2025

July 5, 2025

Payment Terms and Conditions:

1. With the exception of Termination Fee Payment 1, at least [**] prior to each Payment Due Date listed above, BIOVECTRA will

issue invoices with payment instructions to Akebia. Payment of each Termination Fee Payment is due on the corresponding Payment
Due Date listed above.

2.

In addition, for each Termination Fee Payment that Akebia is [**] late to pay (“Late Payment”), Akebia will pay a late fee of [**]
percent ([**]%) of the payment, being [**] US dollars ($[**]USD). BIOVECTRA will issue an invoice to Akebia for the late fee and
payment for late fee is due upon receipt of the invoice.

3. The first Late Payment will also trigger a one-time additional Termination Fee by Akebia to BIOVECTRA of [**] US dollars

($[**]USD). This one-time additional Termination Fee Payment, if triggered, will be due [**].

4. Akebia shall be entitled to a [**] percent ([**]%) discount for prepayment of any of Termination Fees 2-7 listed above in the

Termination Fees table. The prepayment will be applied to the last Termination Fee Payment first. For example, should Akebia
communicate its intention prior to [**] to prepay a Termination Fee Payment that has yet to be paid, Akebia will receive a discount
of [**] percent ([**]%) off the prepayment of Termination Fee Payment 7. The discounted Termination Fee payment would be [**]
US dollars ($[**]USD). Akebia can elect to prepay multiple Termination Fee Payments at once, up to and including all Termination
Fee Payments 2-7 listed above.

5. On a quarterly basis commencing [**], BIOVECTRA has the right to a [**] teleconference with Akebia’s Chief Financial Officer (or
then current Akebia representative with financial responsibility within Akebia) to inquire and confirm ability of Akebia to make
remaining Termination Fee payments. The teleconference will take place within [**] following Akebia’s quarterly earnings call but
not later than [**] after the end of the quarter, except that such call shall occur not later than [**] after the end of each calendar year.

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CONFIDENTIAL        

[**]

ANNEX No. 2 – Akebia Materials

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CONFIDENTIAL        Execution Version

Certain identified information has been excluded from the exhibit because it is both (i) not material and (ii) is the type of
information that the registrant treats as private or confidential. Double asterisks denote omissions.

Exhibit 10.81

LICENSE AGREEMENT

by and among

Akebia Therapeutics, Inc.,

Keryx Biopharmaceuticals, Inc.,

and

Averoa SAS

______________________________________

Dated as of December 22, 2022
______________________________________

    
    
CONFIDENTIAL        Execution Version

TABLE OF CONTENTS

Page

1.    DEFINITIONS    1
2.    LICENSE GRANTS    12
3.    GOVERNANCE    15
4.    DEVELOPMENT, MANUFACTURING, REGULATORY AND COMMERCIALIZATION    18
5.    PAYMENTS    26
6.    INTELLECTUAL PROPERTY RIGHTS    29
7.    CONFIDENTIALITY    35
8.    REPRESENTATIONS, WARRANTIES, AND COVENANTS    41
9.    INDEMNIFICATION    44
10.    TERM; TERMINATION    45
11.    DISPUTE RESOLUTION; GOVERNING LAW    48
12.    MISCELLANEOUS    50

LICENSE AGREEMENT

THIS LICENSE AGREEMENT (“Agreement”) is made effective as of December 22, 2022 (the “Effective Date”), by and among Akebia
Therapeutics, Inc., a Delaware corporation with its principal place of business at 245 First Street, Cambridge, MA 02142 and its Subsidiary,
Keryx Biopharmaceuticals, Inc. (“Keryx,” and collectively, “Akebia”), on the one hand, and Averoa SAS, an French corporation, having a
place  of  business  at  11  avenue  Paul  Verlaine,  38100  Grenoble,  France,  represented  by  Luc-André  Granier  in  his  capacity  as  CEO,  duly
empowered for the purposes hereof (“Licensee”) on the other hand. Akebia and Licensee may, from time to time, be individually referred to
as a “Party” and collectively referred to as the “Parties.”

WHEREAS, Akebia Controls certain Patent Rights and Know-How related to the Licensed Product; and

WHEREAS, Licensee wishes to obtain, and Akebia wishes to grant, certain licenses under such Patent Rights and Know-How to Develop
and Commercialize the Licensed Product on the terms and conditions set forth herein.

RECITALS

NOW, THEREFORE, the Parties, intending to be legally bound hereby, agree as follows:

DEFINITIONS

1.1    “Accounting Standards” means, as applicable, (a) International Financial Reporting Standards, or (b) GAAP.

1.2     “Additional Development” has the meaning set forth in Section 4.3.4 (Additional Development).

1.2     “Affiliate” means, with respect to a Party, any Person that controls, is controlled by, or is under common control with that Party. For
the purpose of this definition, “control” will refer to: (a) the possession, directly or indirectly, of the power to direct the management
or policies of an entity, whether through the ownership of voting securities, by contract or otherwise; or (b) the ownership, directly or
indirectly, of more than 50% of the voting securities of such entity.

1.4     “Agreement” has the meaning set forth in the Preamble.

1.5     “Akebia” has the meaning set forth in the Preamble.

1.6     “Akebia Cost Defense Action” has the meaning set forth in 6.5.2 (Control and Cost).

1.7     “Akebia Defense Action” has the meaning set forth in Section 6.5.1 (Rights to Defend).

1.8     “Akebia Housemarks” means (a) the corporate logos of Akebia and Keryx, (b) the trademarks “AKEBIA” and “KERYX,” (c) any
other trademark, trade name, or service mark (whether registered or unregistered) containing the word “Akebia” or “Keryx,” (d) any
trademark, trade name, or service mark (whether registered or unregistered) used as the name of any clinical trial for the Licensed
Product, (e) any other corporate logo or trademark of Akebia used by Akebia to identify Akebia or its Affiliates, (f) all registrations,
applications  for  registrations,  and  other  intellectual  property  rights  associated  with  any  of  the  foregoing,  and  (g)  all  goodwill
associated with any and all of the foregoing in clauses (a) through (f).

1.9     “Akebia Improvements” means any Improvement invented, conceived, discovered, created, or otherwise developed solely by or on

behalf of Akebia (or its Affiliates) in the performance of activities under this Agreement during the Term.

1.10     “Akebia Indemnitees” has the meaning set forth in Section 9.1 (Indemnification by Licensee).

<#>

1.11     “Akebia Know-How” means Know-How that is Controlled by Akebia on the Effective Date that is necessary to Develop, package in
accordance  with  the  Approved  Labeling,  or  Commercialize  the  Licensed  Product  in  the  Territory  in  the  form  that  it  exists  on  the
Effective  Date,  including  any  data  that  supports  Akebia’s  pediatric  study  plan,  but  expressly  excluding  all  Akebia  Pediatric  Data
(unless and until the Parties agree as to the terms of a license to be granted to Licensee with respect to such Akebia Pediatric Data
and an appropriate cost sharing arrangement as set forth under Section 2.5.1 (By Akebia)), in each case, as set forth in Section 4.3.2
(Pediatric Investigation Plan). Akebia Know-How will also include all Akebia Improvements.

1.12     “Akebia Patent Rights”  means  (a)  the  Patent  Rights  listed  on  Schedule  1.12  (Akebia  Patent  Rights);  (b)  all  Patent  Rights  in  the
Territory  that  directly  or  indirectly  claim  priority  thereto  or  share  common  priority  therewith  whether  filed  before  or  after  the
Effective Date, to the extent Akebia Controls such patents and patent applications; and (c) all Patent Rights Controlled by Akebia or
its  Affiliates  that  are  necessary  to  Develop,  package  in  accordance  with  the  Approved  Labeling,  or  Commercialize  the  Licensed
Product in the Territory.

1.13     “Akebia Pediatric Clinical Trials” has the meaning set forth in Schedule 1.13.

1.14     “Akebia Pediatric Data” means any data, results, or other Akebia Know-How generated in the performance of any ongoing or future

clinical trials included in Akebia’s pediatric investigation plan, including the Akebia Pediatric Clinical Trials.

1.15     “Akebia Technology” means collectively, the Akebia Patent Rights and Akebia Know-How.

1.16     “Alliance Manager” has the meaning set forth in Section 3.8 (Alliance Managers).

1.17     “API” means active pharmaceutical ingredient, which is also commonly referred to as drug substance.

1.18          “Applicable  Laws”  means  any  applicable  federal,  state,  local,  municipal,  foreign  or  other  law,  statute,  legislation,  constitution,
principle  of  common  law,  resolution,  ordinance,  code,  edict,  decree,  proclamation,  treaty,  convention,  rule  or  regulation  issued,
enacted, adopted, passed, approved, promulgated, made, implemented or otherwise put into effect by or under the authority of any
Governmental Authority, including (a) the applicable regulations and guidance of the FDA and E.U. (and national implementations
thereof)  that  constitute  good  laboratory  practices,  good  manufacturing  practices,  good  clinical  practices,  and  any  regulations  or
guidance  of  any  applicable  Regulatory  Authority  (and  national  implementations  thereof)  concerning  healthcare,  promotional,  or
regulatory matters, and, if and as appropriate under the circumstances, International Conference on Harmonization (ICH) guidance or
other comparable regulation and guidance of any applicable Governmental Authority; and (b) data privacy and protection laws and
regulations.

1.19     “Approved Labeling” means: (a) the Regulatory Authority-approved full prescribing information for the Licensed Product; and (b)
the Regulatory Authority-approved labels and other written, printed, or graphic materials on any container, wrapper, or any package
insert that is used with or for the Licensed Product.

1.20     “Arbitration Request” has the meaning set forth in Section 11.2.1 (Arbitration Request).

1.21     “Base Royalties” has the meaning set forth in Section 5.1.1 (Base Royalties).

1.22          “Business  Day”  means  any  day  other  than  a  Saturday,  a  Sunday,  or  a  day  on  which  commercial  banks  located  in  Boston,

Massachusetts, Ireland, or France are authorized or required by law to remain closed.

1.23     “Breaching Party” has the meaning set forth in Section 10.2 (Termination for Breach).

1

1.24     “Calendar Quarter” means the respective periods of three consecutive calendar months ending on March 31, June 30, September 30,

and December 31.

1.25     “Calendar Year” means any 12-month period commencing on January 1.

1.26          “Challenge”  means,  with  respect  to  any  Akebia  Patent  Right  or  Joint  Patent  Right,  to  contest  the  ownership,  validity,  scope,  or
enforceability of any such Akebia Patent Right or Joint Patent Right, in whole or in part, in any action, suit, claim, notice, arbitration,
administrative or other legal proceeding. As used in this definition the term “contest” includes (a) filing an action under 28 U.S.C. §§
2201-2202 seeking a declaration of invalidity or unenforceability of any such Akebia Patent Right or Joint Patent Right; (b) filing, or
joining in, a petition under 35 U.S.C. § 311 to institute inter partes review of any such Patent Right or any portion thereof; (c) filing,
or joining in, a petition under 35 U.S.C. § 321 to institute post-grant review of any such Akebia Patent Right or Joint Patent Right or
any portion thereof; or (d) filing or commencing any opposition, invalidity, nullity, request for revocation or limitation, third party
observation or similar proceedings challenging the validity of any such Akebia Patent Right or Joint Patent Right in any forum in any
country or before any legal or administrative body, including the European Patent Office.

1.27     “CKD” means chronic kidney disease.

1.28     “Claims” means collectively, any and all Third Party demands, claims, actions, suits, and proceedings (whether criminal or civil, in
contract,  tort  or  otherwise)  for  damages,  debts,  obligations,  and  other  liabilities,  losses,  claims,  taxes,  interest  obligations,
deficiencies, judgments, assessments, fines, fees, penalties, or expenses (including amounts paid in settlement, interest, court costs,
costs of investigators, reasonable fees and expenses of attorneys, accountants, financial advisors, consultants and other experts, and
other expenses of litigation).

1.29          “Commercialization Plan”  means  a  rolling  [**]  plan  for  the  Commercialization  of  the  Licensed  Product  in  the  Territory  that  is

prepared, updated, and amended by Licensee in accordance with Section 4.4.3 (Commercialization Plan).

1.30     “Commercialize” or “Commercialization” means to market, promote, otherwise offer for sale, distribute, and sell. When used as a
verb,  “to  Commercialize”  and  “Commercializing”  means  to  engage  in  Commercialization  and  “Commercialized”  has  a
corresponding meaning.

1.31     “Commercially Reasonable Efforts” means, with respect to the Development, Manufacture, or Commercialization of the Licensed
Product by a Party, those efforts and resources, including reasonably necessary personnel, equivalent to the efforts that a similarly
situated biopharmaceutical company or a pharmaceutical company would typically devote to a product of similar market potential,
profit  potential,  and  strategic  value  and  at  a  comparable  stage  in  development  or  product  life  as  the  Licensed  Product,  based  on
conditions  then  prevailing  and  taking  into  account  issues  of  safety  and  efficacy,  anticipated  or  actual  product  labeling,  the
competitiveness  of  alternative  Third  Party  products  in  the  marketplace,  the  expected  likelihood  of  regulatory  approval,  and  the
potential profitability of such Licensed Product marketed or to be marketed.

1.32     “Confidential Information” has the meaning set forth in Section 7.1 (Definition).

1.33          “Control”  or  “Controlled”  means,  with  respect  to  any  Intellectual  Property  Rights,  the  legal  authority  or  right  (whether  by
ownership, license or otherwise other than pursuant to this Agreement) of a Party or its Affiliates to grant a license or a sublicense
under the terms and conditions set forth in this Agreement of or under such Intellectual Property Rights to the other Party without
breaching the terms of any agreement with a Third Party or being required to make any payment to any Third Party (other than any
amounts due to [**] pursuant to the [**] Agreement). If a Party or its Affiliates only can grant a license or sublicense to Intellectual
Property Rights, or provide access to a material or document, of a limited scope due to an encumbrance or other limitation imposed
by a Third Party, “Control” or “Controlled” will be

2

construed to so limit the license or sublicense to such Intellectual Property Rights or the provision of, or provision of access to, such
materials or documents (as applicable). Notwithstanding the foregoing, no Intellectual Property Right will be “Controlled” by either
Party hereunder if such Intellectual Property Right is owned or in-licensed by a Third Party that becomes an Affiliate of such Party
after the Effective Date as a result of such Party being acquired by such Third Party, whether by merger, stock purchase, or purchase
of assets.

1.34          “Cost  of  Goods  Sold”  or  “COGS”  (a)  with  respect  to  any  Licensed  Product  in  API  form,  bulk  form,  or  Finished  Form  that  is
Manufactured  or  supplied  by  any  Third  Party(ies),  the  total  actual  prices  paid  by  Akebia  to  all  such  Third  Party(ies)  for  released
batches of such Licensed Product together with all reasonably allocated indirect costs and overhead applicable to managing its supply
of  Licensed  Product  and  such  Third  Party  suppliers  (including  internal  FTE  costs  associated  therewith);  and  (b)  to  the  extent  any
Licensed  Product  in  API  form,  bulk  form,  or  Finished  Form  is  manufactured  and  supplied  by  Akebia  or  its  Affiliates,  the  fully-
burdened cost of all direct materials and labor and fully-allocated manufacturing overhead directly attributable to the manufacture,
storage,  packaging,  and  shipping  of  such  Licensed  Product,  calculated  in  accordance  with  the  Accounting  Standards  applicable  to
Akebia or its Affiliates, including all Licensed Product testing and yield loss costs, quality control, quality assurance, or other testing
of such Licensed Product, together with all reasonably allocated indirect costs and overhead applicable to the manufacturing of such
Licensed Product (including internal FTE costs associated with supply thereof), or technical operations functions, less costs of goods
returned in accordance with Akebia’s or its Affiliates’ or suppliers’ return policy.

1.35          “CTA”  means:  (a)  a  clinical  trial  application  filed  with  the  European  Medicines  Agency  or  another  Regulatory  Authority  in  a
European  Union  country,  as  described  in  Council  Directive  2001/20/EC;  (b)  any  foreign  equivalents  as  filed  with  the  applicable
Regulatory  Authorities  in  other  countries  or  regulatory  jurisdictions  in  the  Territory,  as  applicable;  and  (c)  all  supplements  and
amendments that may be filed with respect to the foregoing.

1.36     “Develop” or “Development” means all internal and external research, development, and regulatory activities regarding the Licensed
Product, including conducting non-clinical research or clinical trials prior to or after receiving Regulatory Approval, preparation and
submission of all Regulatory Submissions to obtain and maintain Regulatory Approval of the Licensed Product, and any formulation
or process development with respect to the Licensed Product. When used as a verb, “Develop” means to engage in Development.

1.37     “Deferred Royalties” has the meaning set forth in Section 4.9.3(d).

1.38     “Disclosing Party” has the meaning set forth in Section 7.1 (Definition).

1.39     “Distributor” means a Third Party that purchases the Licensed Product in Finished Form from Licensee or any of its Affiliates or its
Sublicensees with the intent or purpose of reselling such Licensed Product, but does not make any royalty or profit share payment to
Licensee or its Affiliates or its Sublicensee with respect to its resale of such Licensed Product, even if such Third Party is granted a
sublicense under the Akebia Technology in the Field in the Territory in order to facilitate such Third Party’s distribution, marketing,
or sale of the Licensed Product in the Territory.

1.40     “Drug Substance” means Fexeric  (ferric citrate) drug substance.

®

1.41     “EAP” or “Early Access Program” means any program to provide patients with a Licensed Product prior to receipt of Regulatory
Approval  and  prior  to  First  Commercial  Sale  in  any  country  in  the  Territory.  Early  Access  Programs  include  treatment  INDs  /
protocols, named patient programs and compassionate use programs in other countries. For clarity, an EAP with respect to any of the
Licensed Products may continue to be performed following Regulatory

3

Approval of such Licensed Product and costs may continue to be incurred in accordance with the performance of such EAP after
Regulatory Approval.

1.42     “Effective Date” has the meaning set forth in the Preamble.

1.43     “EMA” means the European Medicines Agency, or any successor agency thereto.

1.44     “EMA Approval Date” means the first date on which the EMA approves the MAA for the Licensed Product.

1.45     “E.U.” means the European Union as constituted as of the Effective Date.

1.46     “[**] Pricing and Reimbursement Date” means the first date on which the Licensed Product has received Reimbursement Approval
in [**] of the Major Market Countries. For clarity, any EAP authorization granted with regards to the Licensed Product will not be
deemed a “Reimbursement Approval” for the purposes of this Section 1.46 ([**] Pricing and Reimbursement Date).

1.47     “Executive Officer” means the chief executive officer of a Party or any of its Affiliates or his or her designee.

1.48     “Exploit” means to Develop, Commercialize, Manufacture, and otherwise exploit. When used as a verb, “Exploit” and “Exploiting”

means to engage in Exploitation and “Exploited” has a corresponding meaning.

1.49     “FDA” means the United States Food and Drug Administration, or any successor federal agency thereto.

1.50     “FFDCA” means the United States Federal Food, Drug and Cosmetic Act, as amended from time to time, together with any rules,

regulations, and requirements promulgated thereunder (including all additions, supplements, extensions and modifications thereto).

1.51     “Field” means the treatment, prevention, and diagnosis of any human diseases, including hyperphosphatemia and IDA.

1.52     “Finished Form” means the Licensed Product in finished form and with all applicable Packaging and Labeling.

1.53     “First Commercial Sale” means with respect to the Licensed Product and a country in the Territory, the date on which Licensee or its
Affiliate  or  Sublicensee  first  sells  the  Licensed  Product  to  a  Third  Party  (other  than  to  any  Sublicensee  or  to  an  affiliate  of  any
Sublicensee) for monetary consideration.

1.54     “FTE” means the equivalent of the work of one duly qualified employee of Akebia full time for one year (consisting of a total of [**]
hours per year) carrying out scientific or technical work under this Agreement. Overtime, and work on weekends, holidays and the
like  will  not  be  counted  with  any  multiplier  (e.g.,  time-and-a-half  or  double  time)  toward  the  number  of  hours  that  are  used  to
calculate the FTE contribution. The portion of an FTE billable by Akebia for one individual during a given accounting period will be
determined by dividing the number of hours worked directly by said individual on the work to be conducted under this Agreement
during such accounting period and the number of FTE hours applicable for such accounting period based on [**] working hours per
Calendar Year.

1.55     “GAAP” means the generally accepted accounting principles in the United States, consistently applied.

4

1.56     “Generic Product” means, on a country-by-country basis in a particular country in the Territory, any pharmaceutical product sold by
a Third Party (other than an Affiliate or Sublicensee of Licensee) in such country that: (a) contains the same API as the Licensed
Product  in  the  same  dosage  form  and  formulation  (e.g.,  oral,  injectable,  or  intranasal)  as  the  Licensed  Product,  (b)  relies  on  the
Regulatory  Submissions  of  the  Licensed  Product  to  obtain  Regulatory  Approval  in  such  country;  and  (c)  is  categorized  by  the
applicable Regulatory Authority in such country to be therapeutically equivalent to, or interchangeable with, the Licensed Product,
such that the pharmaceutical product may be substituted for the Licensed Product at the point of dispensing without any intervention
by the prescribing physician in such country.

1.57     “Governmental Authority” means any arbitrator, court, judicial, legislative, administrative or Regulatory Authority, commission,
department,  board,  bureau  or  body,  or  other  government  authority  or  instrumentality  or  any  person  or  entity  exercising  executive,
legislative,  judicial,  regulatory  or  administrative  functions  of  or  pertaining  to  government,  whether  foreign  or  domestic,  whether
federal, state, provincial, municipal, or other. For clarity, Governmental Authorities include all Regulatory Authorities.

1.58     “ICH” means the International Conference on Harmonization.

1.59     “IDA” means iron deficiency anemia.

1.60     “Improvement” means any process, method, composition of matter, article of manufacture, discovery, or finding that is conceived or
reduced  to  practice  (whether  or  not  patentable)  relating  to,  arising  from  the  use  of,  or  including  the  Licensed  Product  or  its
Exploitation.

1.61     “Incremental Royalties” has the meaning set forth in Section 5.1.2 (Incremental Royalties).

1.62     “Indemnified Party” has the meaning set forth in Section 9.3 (Indemnification Procedure).

1.63     “Indemnifying Party” has the meaning set forth in Section 9.3 (Indemnification Procedure).

1.64     “Infringement Claim” has the meaning set forth in Section 6.7.1 (Infringement Claim).

1.65          “Intellectual  Property  Rights”  means  all  rights  in  Know-How,  Patent  Rights,  copyrights,  Marks,  design  rights,  database  rights,
domain names, moral rights, and any and all other intellectual property or proprietary rights (whether registered or unregistered and
whether patentable or unpatentable) now known or hereafter recognized in any jurisdiction, and all applications and rights to apply
for any of them, anywhere in the world.

1.66     “Invalidation Proceeding” has the meaning set forth in Section 6.7.4(a) (Initiation).

1.67     “Joint Improvements” means any Improvement that is invented, conceived, discovered, created, or otherwise developed during the
Term in the performance of any activities under this Agreement jointly by at least one employee of Akebia or its Affiliate or any
Third  Party  contractually  required  to  assign  or  license  such  Improvement  to  Akebia  and  at  least  one  employee  of  Licensee  or  its
Affiliate or Third Party contractually required to assign such Improvement to Licensee.

1.68     “Joint Patent Rights” means all Patent Rights that cover or claim the Joint Improvements.

1.69     “JSC” has the meaning set forth in Section 3.1 (Formation and Purpose of the JSC).

1.70     “Keryx” has the meaning set forth in the Preamble.

1.71     “Know-How” means any proprietary records, chemical or biological materials, know-how, processes, techniques, show-how, design

information, information, formulations, technology,

5

practices, trade secrets, inventions, methods, data (including animal data, raw data, clinical data, and quality control data) and results
in any form whatsoever, whether patentable or unpatentable.

1.72     “Know-How Transfer” has the meaning set forth in Section 2.5.1 (Know-How Transfer By Akebia).

1.73     “Knowledge” means the actual knowledge, without any inquiry or investigation, of Akebia’s officers as defined under Rule 16a-1(f)

of the Securities Exchange Act of 1934 (or amendment thereto or replacement or successor law) as of the Effective Date.

1.74     “Launch Countries” has the meaning set forth in Section 4.4.1 (Launch Sequence).

1.75     “Launch Sequence” has the meaning set forth in Section 4.4.1 (Launch Sequence).

1.76     “LCIA” has the meaning set forth in Section 11.2.3 (Arbitration Procedure).

1.77     “Licensee” has the meaning set forth in the Preamble.

1.78     “Licensee Cost Defense Action” has the meaning set forth in 6.5.2 (Control and Cost).

1.79     “Licensee Manufacturing Process” has the meaning set forth in Section 4.6 (Licensee Manufacturing Process Development).

1.80          “Licensed  Product”  means  Fexeric   (ferric  citrate)  (currently  marketed  by  Akebia  in  the  United  States  under  the  brand  name
Auryxia ),  and  any  other  preparation,  formulation,  or  dosage  form  thereof  that  has  ferric  citrate  as  its  sole  active  ingredient,
including ferric citrate coordination complexes, but excluding any product that includes Fexeric  (ferric citrate), Auryxia ,  or  any
other form of ferric citrate, in each case, together with any other active ingredient.

®

®

®

®

1.81     “Licensee Defense Action” has the meaning set forth in Section 6.6.1 (Rights to Defend).

1.82     “Licensee Development Data” means and includes all data relating to the Licensed Product and all chemistry, manufacturing, and
control  data  relating  to  the  Development  and  Manufacture  of  the  Licensed  Product,  results  of  pre-clinical  and  clinical  trials
(including  all  Post-Approval  Studies)  and  all  other  documentation  containing  or  embodying  any  preclinical,  clinical,  chemistry,
manufacturing, and control data relating to any Regulatory Submissions for the Licensed Product, in each case, that is generated by
or on behalf of Licensee, or its agents, Affiliates, or Sublicensees during the Term.

1.83     “Licensee Development Know-How” means all information and materials, including discoveries, processes, instructions, formulas,
data, inventions, knowhow and trade secrets, patentable or otherwise, in each case, that arise out of the Development, Manufacture,
Commercialization,  or  other  Exploitation  by  or  on  behalf  of  Licensee  of  the  Licensed  Product,  including  all  biological,  chemical,
pharmacological,  toxicological,  pharmaceutical,  physical,  analytical,  clinical,  safety,  manufacturing  and  quality  control  data  and
information  related  thereto,  and  all  applications,  registrations,  licenses  authorizations,  documents,  approvals,  and  correspondence
relating  to  the  Licensed  Product,  including  correspondence  submitted  to  Regulatory  Authorities  and  all  information  and  data
contained in Regulatory Submissions. Licensee Development Know-How will also include all Licensee Improvements and Licensee
Development Data.

1.84     “Licensee Housemarks”  means  (a)  the  corporate  logos  of  Licensee,  (b)  the  trademarks  “Averoa,”  (c)  any  other  trademark,  trade
name, or service mark (whether registered or unregistered) containing the word “Averoa,” (d) any other corporate logo or trademark
of  Licensee  used  by  Licensee  to  identify  Licensee  or  its  Affiliates,  (e)  all  registrations,  applications  for  registrations,  and  other
intellectual property rights associated with any of the foregoing, and (f) all goodwill associated with any and all of the foregoing in
clauses (a) through (e).

6

1.85     “Licensee Improvements” means any Improvements invented, conceived, discovered, created, or otherwise developed during the
Term by or on behalf of Licensee (or its Affiliates or its Sublicensees) in the performance of activities under this Agreement.

1.86     “Licensee Indemnitees” has the meaning set forth in Section 9.2 (Indemnification by Akebia).

1.87     “Licensee Patent Rights” means any and all Patent Rights Controlled by Licensee or its Affiliates as of the Effective Date or during
the Term that are directed to or otherwise pertain to the Licensed Product or its Manufacture or use, including those Patent Rights
that cover or claim Licensee’s interest in Improvements or any Licensee Development Know-How.

1.88     “Licensee Technology” means collectively, the Licensee Patent Rights and Licensee Development Know-How.

1.89     “MAA” has the meaning set forth in Section 1.95 (Marketing Authorization).

1.90     “MA Holder” means the entity that holds the marketing authorization for the Licensed Product in a given country.

1.91     “Major Market Country” means each of [**].

1.92          “Manufacture”  or  “Manufacturing”  means  to  make,  produce,  manufacture,  process,  fill,  finish,  package,  label,  perform  quality
assurance testing, release, ship or store the Licensed Product or any component thereof. When used as a noun, “Manufacture” or
“Manufacturing” means any and all activities involved in Manufacturing the Licensed Product or any component thereof.

1.93     “Manufacturing Technology Transfer” has the meaning set forth in Section 4.7.2.

1.94     “Mark” means any trademark, trade name, service mark, service name, product name, brand, domain name, trade dress, logo, slogan,
or other indicia of origin or ownership, and (a) all registrations, applications for registrations, and other intellectual property rights
associated with any of the foregoing, and (b) the goodwill associated with each of the foregoing.

1.95          “Marketing Authorization”  means  (a)  a  marketing  authorization  application  filed  with  (i)  the  EMA  under  the  centralized  EMA
filing  procedure  to  gain  approval  to  market  a  pharmaceutical  or  diagnostic  product  in  the  E.U.  (“MAA”),  or  (ii)  a  Regulatory
Authority in any E.U. country if the centralized EMA filing procedure is not used to gain approval to market a pharmaceutical or
diagnostic product in the E.U., or (b) any other equivalent or related Regulatory Submissions filed in support of approval to market a
pharmaceutical  or  diagnostic  product  in  any  country  outside  the  E.U.,  and,  in  each  case  ((a)  and  (b)),  including  any  amendments
thereto, and supplemental applications.

1.96     “Minimum Royalty” has the meaning set forth in Section 5.1.3 (Minimum Royalties).

1.97     “Net Sales” with respect to any Licensed Product means the gross sales (i.e., gross invoice prices) of such Licensed Product billed by
Licensee or its Affiliates, as applicable, or their respective Sublicensees to Third Party customers (including Distributors) on all sales
of the Licensed Product and exclusive of intercompany transfer or sales, less the following deductions from such gross sales:

(a)

(b)

actual  credited  allowances  to  such  Third  Party  customers  for  spoiled,  damaged,  outdated,  recalled,  or  returned  Licensed
Product and for retroactive price reductions or billing corrections,

the amounts of trade, cash discounts and rebates, to the extent such discounts and rebates were not deducted by Licensee or
Akebia, as applicable, or their respective Sublicensees at the time of invoice in order to arrive at the gross invoice prices,

7

(c)

(d)

all transportation, handling charges and freight insurance, sales taxes, excise taxes, use taxes, import/export duties paid or
distribution fees paid to Third Parties, and

invoiced amounts from a prior period that have not been collected and have been written off by Akebia or Licensee or its
Sublicensee (as applicable), including bad debts, to the extent such amounts have not been previously deducted and do not
exceed, in the aggregate, [**]% of Net Sale in the applicable period; provided that any such amounts that are written off will
be added back in a subsequent period to the extent later collected; and

(e)

all other reasonable and customary allowances and adjustments whether during the specific royalty period or not.

Subject to the above, Net Sales will be determined in accordance with the applicable Accounting Standards, consistently applied.

If  Licensee  or  a  Sublicensee  receives  [**]  for  the  Licensed  Product  sold  to  a  Third  Party,  then  the  Net  Sales  amount  for  such
Licensed Product will be [**].

With respect to [**] of the Licensed Product, “Net Sales” will [**]; provided that, upon [**] will be [**].

1.98     “Non-Breaching Party” has the meaning set forth in Section 10.2 (Termination for Breach).

1.99     “Non-Disclosure Agreement” has the meaning set forth in Section 12.2 (Entire Agreement; Amendment).

1.100     “Packaging and Labeling” means primary, secondary, or tertiary packaging and labeling of the Licensed Product (in its commercial
packaging presentation) for sale or use in the Territory, including the Approved Labeling and insertion of materials such as patient
inserts,  patient  medication  guides,  and  professional  inserts  and  any  other  written,  printed,  or  graphic  materials  accompanying  the
Licensed  Product  and  any  brand  security  or  anti-counterfeiting  measures  included  in  the  packaging  elements  for  the  Licensed
Product considered to be part of the finished packaged Licensed Product, and all testing and release thereto.

1.101     “[**]” means [**].

1.102     “[**] Agreement” means that certain [**] Agreement, dated as of [**], by and between Akebia and [**].

1.103     “[**] Patent Rights” means any and all Akebia Patent Rights that are Controlled by Akebia pursuant to the [**] Agreement

1.104     “[**] Royalty Term” means on a country-by country basis, the period commencing on the date of First Commercial Sale of the first
Licensed Product in such country and expiring upon the expiration of the last Valid Claim included in the [**] Patent Rights in such
country.

1.105     “Party” or “Parties” has the meaning set forth in the Preamble.

1.106          “Patent  Rights”  means  all  rights,  title  and  interests  in  and  to  (a)  all  national,  regional,  and  international  patents  and  patent
applications filed in any country of the world including provisional patent applications and all supplementary protection certificates,
(b)  all  patent  applications  filed  either  from  such  patents,  patent  applications,  or  provisional  applications  or  from  an  application
claiming priority from any of these, including any continuation, continuation-in part, divisional, provisional, converted provisionals
and continued prosecution applications, or any substitute applications, (c) any patent issued with respect to or in the future issued
from any such patent applications, including utility models, petty patents, and design patents and

8

certificates  of  invention,  and  (d)  any  and  all  extensions  or  restorations  by  existing  or  future  extension  or  restoration  mechanisms,
including revalidations, reissues, reexaminations and extensions (including any supplementary protection certificates and the like) of
the foregoing patents or patent applications.

1.107          “Person”  means  an  individual,  corporation,  partnership,  limited  liability  company,  trust,  business  trust,  association,  joint  stock
company, joint venture, pool, syndicate, sole proprietorship, unincorporated organization, Governmental Authority or any other form
of entity not specifically listed herein.

1.108     “Pharmacovigilance Agreement” has the meaning set forth in Section 4.11 (Pharmacovigilance).

1.109     “Post-Approval Studies” means any post-approval study as required by the EMA, including any post-authorization safety study and
any pediatric clinical study, in each case, related to the Licensed Product conducted with the aim of identifying, characterizing, or
quantifying  a  safety  hazard,  confirming  the  safety  profile  of  the  Licensed  Product,  or  of  measuring  the  effectiveness  of  risk
management measures.

1.110     “Product Marks” means the Marks Controlled by Licensee relating to the Licensed Product.

1.111     “Professional Requirements” means (a) the codes and standards of the European Accreditation Council for Continuing Medical
Education  (EACCME)  and  the  European  Federation  of  Pharmaceutical  Industries  and  Associations  (EFPIA),  (b)  the  codes  of  the
Prescription Medicines Code of Practice Authority (PMCPA) and the Association of the British Pharmaceutical Industry (ABPI), and
(c)  all  other  accepted  national  and  international  pharmaceutical  industry  codes  of  practice  in  and  for  the  relevant  countries  in  the
Territory, as any of the foregoing may be amended from time-to-time.

1.112     “Quality Agreement” has the meaning set forth in Section 4.9.6 (Quality Agreement).

1.113     “Receiving Party” has the meaning set forth in Section 7.1 (Definition).

1.114          “Regulatory  Approval”  means,  with  respect  to  the  Licensed  Product  in  any  country  or  regulatory  jurisdiction,  any  approval
(including  where  required,  Reimbursement  Approvals),  registration,  license,  or  authorization  that  is  required  by  the  applicable
Regulatory Authority to Manufacture and Commercialize such Licensed Product in such country or regulatory jurisdiction.

1.115     “Regulatory Authority” means, in a particular country or jurisdiction, any applicable Governmental Authority involved in granting
Regulatory  Approval  in  such  country  or  jurisdiction,  including  (a)  in  the  E.U.,  the  EMA  and  any  other  applicable  Governmental
Authority  in  the  countries  in  the  E.U.  having  jurisdiction  over  the  Licensed  Product,  and  (b)  in  other  countries,  other  analogous
Governmental Authorities having jurisdiction over the Licensed Product.

1.116     “Regulatory Submissions” means all applications, filings, dossiers, and other documents submitted to a Regulatory Authority in
support of Development, Manufacture, or Commercialization of the Licensed Product inside and outside of the Territory, including
for  the  purpose  of  obtaining  Regulatory  Approval  from  that  Regulatory  Authority.  Regulatory  Submissions  include  all  CTAs,
Marketing Authorizations, and other Regulatory Approval applications and their equivalents inside and outside of the Territory.

1.117          “Reimbursement  Approval”  means  an  approval,  agreement,  determination,  or  other  decision  by  the  applicable  Governmental
Authority that establishes prices charged to end-users for biopharmaceutical products that the Licensed Product will be reimbursed
by the Regulatory Authorities or other Governmental Authorities in the European Economic Area and European Union.

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1.118     “Representatives” has the meaning set forth in Section 7.2 (Obligations).

1.119     “Royalties” has the meaning set forth in Section 5.1.2 (Incremental Royalties).

1.120     “Royalty Term” means, on a country-by country basis, the period commencing on the date of First Commercial Sale of the first
Licensed Product in such country and expiring upon the latest of: (a) 10 years following the date of First Commercial Sale of the
Licensed Product in such country; (b) expiration of the last Valid Claim of the Akebia Patent Rights and Joint Patent Rights in such
country; or (c) the date of expiration of the data, regulatory, or marketing exclusivity period conferred by the applicable Regulatory
Authority in such country with respect to the Licensed Product.

1.121     “Subcontractor” has the meaning set forth in Section 2.3 (Licensee’s Right to Subcontract).

1.122     “Sublicensee” has the meaning set forth in Section 2.2 (Licensee’s Right to Grant Sublicenses).

1.123     “Supply Agreement” has the meaning set forth in Section 4.9 (Supply Agreement).

1.124     “Supply Price” has the meaning set forth in Section 4.9.1 (Supply Price).

1.125     “Supply Termination Right” has the meaning set forth in Section 4.9.2 (Supply Termination Right).

1.126     “Target Indication” means the use of the Licensed Product for the treatment of [**] in adult CKD patients [**].

1.127     “Term” has the meaning set forth in Section 10.1 (Term).

1.128     “Territory” means the European Economic Area, Turkey, Switzerland, and the United Kingdom.

1.129     “Third Party” means any Person other than a Party or an Affiliate of a Party.

1.130     “Trademark License” has the meaning set forth in Section 4.10.3 (Trademark License).

1.131     “Valid Claim” means, with respect to a particular country or region, a claim in any: (a) issued and unexpired patent that has not
been permanently revoked or declared unenforceable or invalid by an unreversed and unappealable or unreversed and unappealed
decision of a court or other appropriate body of competent jurisdiction in such country or region and that has not been abandoned,
disclaimed,  denied,  or  admitted  to  be  invalid  or  unenforceable  through  reissue,  re-examination,  disclaimer,  or  otherwise;  or  (b)  a
claim of a pending patent application that has not been cancelled, withdrawn, abandoned, or finally disallowed without the possibility
of appeal or refiling of such application and has not been pending for more than [**] from the first substantive action on the merits in
such country or region; provided that, if a claim ceases to be a Valid Claim by reason of foregoing subclause (b), then such claim
would again be deemed a Valid Claim in the event such claim subsequently issues prior to the end of the then-current Royalty Term
in such country or region.

1.132     “Withholding Party” has the meaning set forth in Section 5.4 (Taxes).

1.133     “Year 1” has the meaning set forth in Section 5.1.3 (Minimum Royalties).

1.134     “Year 2” has the meaning set forth in Section 5.1.3 (Minimum Royalties).

1.135    “Year 3” has the meaning set forth in Section 5.1.3 (Minimum Royalties).

10

2.

LICENSE GRANTS

2.1.

License Grants to Licensee.

2.1.1. Development and Commercialization License. Subject to the terms and conditions of this Agreement (including Section
2.6 (Retained Rights)), Akebia hereby grants to Licensee and its Affiliates a sublicensable (subject to Section 2.2 (Licensee’s
Right to Grant Sublicenses)), royalty-bearing right and license under the Akebia Technology to Develop (in accordance with
the  Development  Plan)  and  Commercialize  (in  accordance  with  the  Commercialization  Plan)  the  Licensed  Product  in  the
Field in the Territory during the Term. The foregoing license will be co-exclusive with Akebia in the Field in the Territory
during the Term with respect to Development of the Licensed Product, and exclusive in the Field in the Territory during the
Term with respect to Commercialization of the Licensed Product.

2.1.2. Packaging License. Subject to the terms and conditions of this Agreement (including Section 2.6 (Retained Rights)), Akebia
hereby grants to Licensee a sublicensable (subject to Section 2.2 (Licensee’s Right to Grant Sublicenses)), royalty-bearing
non-exclusive right and license under the Akebia Technology to package the Licensed Product in the Field in the Territory
during the Term in accordance with the Approved Labeling.

2.2.

Licensee’s  Right  to  Grant  Sublicenses.  Licensee  and  its  Affiliates  may  sublicense  the  rights  granted  to  it  by  Akebia  under  the
license  granted  in  Section  2.1  (License  Grants  to  Licensee),  upon  Akebia’s  prior  written  approval  (such  approval  not  to  be
unreasonably  withheld)  (a)  to  any  Subcontractor  that  requires  a  sublicense  of  the  rights  granted  to  Licensee  under  Section  2.1
(License Grants to Licensee) or (b) to any other Third Party (each, a “Sublicensee”). Any and all sublicenses will be in writing and
will  be  subject  to  the  following  requirements,  and  any  sublicense  granted  hereunder  that  is  inconsistent  with  this  Section  2.2
(Licensee’s  Right  to  Grant  Sublicenses)  will  be  null  and  void.  If  Licensee  requests  in  writing  Akebia’s  written  approval  to  any
proposed Sublicensee pursuant to this Section 2.2 (Licensee’s Right to Grant Sublicenses), then Akebia will use good faith efforts to
provide a written response to Licensee within [**] of Akebia’s receipt of such written request.

2.2.1

Sublicensing Terms. All sublicenses will be subject to and consistent with the terms and conditions of this Agreement and
will:  (a)  require  each  Sublicensee  and  Affiliate  to  comply  with  the  applicable  terms  and  conditions  of  this  Agreement
(including the Royalty reporting obligations set forth under Section 4.4.2 (Progress Reports), Section 5.1.5 (Flash Reports),
and Section 5.1.6 (Royalty Reports and Records)) and the record keeping and audit requirements set forth under Section 5.5
(Accounting; Audit), (b) include Akebia as an intended third party beneficiary under the sublicense with the right to enforce
the  applicable  terms  of  such  sublicense,  (c)  preclude  the  granting  of  further  sublicenses,  and  (d)  include  a  sublicensable
license  back  to  Licensee  of  all  Intellectual  Property  Rights  made  or  generated  by  the  Sublicensee  in  the  performance  of
activities under the applicable sublicense agreement (such that Licensee Controls such Intellectual Property Rights for the
purposes of this Agreement).

2.2.2        Responsibility  of  Licensee.  Licensee  will  remain  responsible  and  liable  for  the  performance  of  all  Sublicensees  and
Affiliates under their sublicensed rights to the same extent as if such activities were conducted by Licensee and any breach of
this Agreement by a Sublicensee or Affiliate of Licensee will be deemed a breach by Licensee hereunder. In no event will
any sublicense relieve Licensee of any of its obligations under this Agreement.

11

2.3.

2.4.

2.5.

2.2.3    Copies of Sublicenses. Licensee will furnish to Akebia a true and complete copy of each agreement with a Sublicensee or an

Affiliate and each amendment thereto no later than [**] after the execution of such sublicense or amendment.

Licensee’s  Right  to  Subcontract.  In  performing  its  Development  activities  under  this  Agreement,  Licensee  may  engage  any
consultant,  subcontractor,  Distributor,  co-promotion  partner,  or  other  vendor  to  conduct  Licensee’s  obligations  thereunder  or
hereunder (each, a “Subcontractor”), subject to the terms of Section 2.2 (Licensee’s Right to Grant Sublicenses), which will apply
to  any  Subcontractor  that  requires  a  sublicense  of  the  rights  granted  to  Licensee  under  Section  2.1  (License  Grants  to  Licensee);
provided that (a) Licensee remains responsible for (i) the management of its Subcontractors, (ii) fulfillment by its Subcontractors of
all  obligations  set  forth  under  this  Agreement  as  if  the  Subcontractor  were  a  party  hereto,  and  (iii)  any  uncured  breach  by
Subcontractor of any obligation of Licensee under this Agreement, and (b) Licensee will terminate promptly any Subcontractor, and
will give Akebia notice of such termination, in the case of any breach of this Agreement by a Subcontractor. Without limitation, such
contracts  entered  into  with  Subcontractors  will  contain  provisions,  including  those  relating  to  Intellectual  Property  Rights,
confidentiality, and non-use, in each case, that are consistent with, and no less restrictive than, those set forth in this Agreement. The
engagement of any Subcontractor in compliance with this Section 2.3 (Licensee’s Right to Subcontract) will not relieve Licensee of
its obligations under this Agreement.

License Grant to Akebia. Subject to the terms and conditions of this Agreement, Licensee hereby grants to Akebia a non-exclusive,
worldwide,  royalty-free,  fully  paid-up,  perpetual,  irrevocable,  sublicensable  (through  multiple  tiers)  right  and  license  under  all
Licensee Technology to Develop, Manufacture, Commercialize, and otherwise Exploit the Licensed Product.
Know-How Transfer.
2.5.1. By Akebia.  Within  a  [**]  period  from  the  Effective  Date,  to  the  extent  not  previously  provided  to  Licensee,  Akebia  will
provide  and  transfer  to  Licensee  copies  of  Akebia  Know-How  that  exists  on  the  Effective  Date  and  that  is  necessary,  in
Akebia’s reasonable discretion, for Licensee to perform its obligations under this Agreement (the “Know-How Transfer”).
Akebia may make such Akebia Know-How available in such reasonable form as Akebia determines. Notwithstanding any
provision to the contrary set forth in this Agreement, the Know-How Transfer will not include any Akebia Pediatric Data,
unless and until the Parties agree as to the terms of a license to be granted to Licensee with respect to such Akebia Pediatric
Data and an appropriate cost sharing arrangement, in each case, as set forth in Section 4.3.2 (Pediatric Investigation Plan).

2.5.2. By Licensee. In addition, prior to each meeting of the JSC, Licensee will disclose to Akebia all Licensee Development Data

and Licensee Development Know-How, in each case, not previously disclosed to Akebia.

2.6    Retained Rights. Any rights of Akebia not expressly granted to Licensee under the provisions of this Agreement will be retained by
Akebia (and may be exercised by Akebia itself or through its Affiliates or Third Parties in its sole discretion), including, in each case,
(a)  the  right  to  Develop,  Manufacture,  Commercialize,  or  otherwise  Exploit  the  Licensed  Product  in  any  country  outside  of  the
Territory,  including  under  the  brand  name  Auryxia   in  the  United  States,  (b)  the  right  to  Develop  and  Manufacture  the  Licensed
Product in the Territory, (c) the right to Develop, Manufacture, Commercialize, or otherwise Exploit in any Field and in any country
products and technologies practicing the Akebia Technology, other than the Licensed Product, (d) the right to exploit or license the
Akebia Technology other than for the purposes of Exploiting any Licensed Product, and (e) the right to perform its obligations and
exercise  its  rights  under  this  Agreement.  Licensee  will  not  practice  or  sublicense  the  Akebia  Technology  or  Exploit  the  Licensed
Product, in each case, except as expressly permitted under this Agreement. In addition, Akebia expressly

®

12

retains the right to perform or exercise, or have performed or exercised by an Affiliate, Akebia’s obligations and rights under this
Agreement.

2.7        No  Additional  Rights;  Compliance  with  [**]  License.  Nothing  in  this  Agreement  will  be  construed  to  confer  any  rights  upon
Licensee  by  implication,  estoppel,  or  otherwise  as  to  any  active  pharmaceutical  ingredients,  molecules,  compounds,  products,
technology, or Intellectual Property Rights of Akebia other than the rights under the Akebia Technology expressly granted herein.
Notwithstanding any provision to the contrary set forth in this Agreement, the Parties acknowledge that the rights and license granted
to Licensee hereunder are subject to Akebia’s rights and license under the [**] Agreement, and nothing in this Agreement will be
construed to grant to Licensee any rights beyond those that Akebia has the right to grant to Licensee pursuant to the [**] Agreement.
All rights, title, and interests not specifically and expressly granted by Akebia hereunder are hereby reserved.

3.

3.1.

GOVERNANCE

Formation  and  Purpose  of  the  JSC.  The  Joint  Steering  Committee  (“JSC”)  will  coordinate  and  monitor  the  Development,
Manufacturing,  and  Commercialization  of  the  Licensed  Product  in  the  Field  in  the  Territory  in  accordance  with  this  Section  3.1
(Formation and purpose of the JSC) and will have the responsibilities set forth herein. The JSC may establish a charter that will not
be binding on the Parties and that will include details regarding the operation of the JSC consistent with this Article 3 (Governance).
The JSC will dissolve upon the expiration of the Term.

3.2. Membership.  Each  Party  will  designate  up  to  [**]  representatives  from  appropriate  functional  areas  with  appropriate  knowledge,
expertise, and decision-making authority to serve as members of the JSC. Each Party may replace its JSC representatives at any time
upon written notice to the other Party. Licensee will designate one of its JSC members to serve as chairperson. The chairperson or his
or her designee, in collaboration with the Alliance Managers, will be responsible for calling meetings, preparing, and circulating an
agenda in advance of each meeting, and preparing and issuing minutes of each meeting within [**] thereafter. Such minutes will not
be finalized until all JSC members have had an adequate opportunity to review and confirm the accuracy of such minutes.

3.3. Meetings. The JSC will hold meetings at such times as it elects to do so, but in no event will such meetings be held less frequently
than  [**],  unless  otherwise  agreed  by  the  Parties.  The  JSC  will  meet  alternatively  at  Licensee’s  facilities  in  Europe  and  Akebia’s
facilities in Massachusetts, or at such locations as the Parties may otherwise agree. Meetings of the JSC may be held by audio or
video teleconference at the request of either Party. The Alliance Manager of each Party will attend each meeting of the JSC as a non-
voting participant. Each Party will be responsible for all of its own expenses of participating in any JSC meeting.

3.4.

Specific Responsibilities of the JSC. The responsibilities of the JSC will be to:

3.4.1. manage the overall strategic alignment between the Parties under this Agreement and maintain the relationship between the

Parties;

3.4.2.

[**] whether to establish, and so establish, subcommittees and delegate specifically-defined duties to such subcommittees on
an “as needed” basis to oversee particular projects or activities hereunder;

3.4.3. meet regularly to conduct the responsibilities set forth in this Agreement, as described in Section 3.3 (Meetings);

3.4.4.

[**]  regulatory  activities  and  strategy  for  obtaining  and  maintaining  all  Regulatory  Approvals  and  Reimbursement
Approvals, as described in Section 4.2 (Regulatory);

3.4.5.

[**]  whether  to  approve  the  Development  Plan,  and  all  amendments  or  updates  thereto,  as  described  in  Section  4.3.1
(Development Responsibilities; Development Plan) and [**]

13

any Additional Development of the Licensed Product proposed by either 
Party as described in Section 4.3.4 (Additional Development);

3.4.6.

[**] any updates or modifications to the Target Indication as described in Section 4.3.5 (Target Indication);

3.4.7.

[**]  any  amendments  to  the  Launch  Sequence  to  be  prepared  by  Licensee,  subject  to  and  as  described  in  Section  4.4.1
(Launch Sequence);

3.4.8.

[**] the Commercialization Plan or any amendments thereto, as described in Section 4.4.3 (Commercialization Plan);

3.4.9.

[**] the Manufacture and supply of the Licensed Product for the Territory, pursuant, if applicable, to the Supply Agreement;

3.4.10. [**] whether to approve any Marks other than the Licensee Housemarks and the Product Marks to be used by Licensee in the
Commercialization of the Licensed Product in the Territory in accordance with Section 4.10.2 (Ownership; Branding);

3.4.11. [**] any required modifications to the Licensed Products to avoid infringement of any Patent Rights owned or controlled by

a Third Party, as described in Section 6.7.3 (Responsibility for Third Party Licenses); and

3.4.12. perform such other functions as appropriate to further the purposes of this Agreement as determined by the Parties.
3.5        Additional  Participants.  At  the  request  of  either  Party,  other  employees  of  such  Party  or  any  of  its  Affiliates  involved  in  the
Development,  Manufacturing,  or  Commercialization  of  the  Licensed  Product  may  attend  meetings  of  the  JSC  as  non-voting
participants. In addition, with the consent of each Party, consultants, representatives, or advisors involved in the same activities may
attend  meetings  of  the  JSC  as  non-voting  observers;  provided  that  such  Third  Party  participants  and  observers  are  under  written
obligations  of  confidentiality  and  non-use  applicable  to  the  Confidential  Information  of  each  Party  that  are  at  least  as  stringent  as
those set forth in Article 7 (Confidentiality).

3.6    Decision-Making and Committee Dispute Resolution.

3.6.1    Voting; Consensus. With respect to decisions of the JSC, the representatives of each Party will have collectively one vote on
behalf of such Party. For each meeting of the JSC, at least [**] representatives of each Party will constitute a quorum. Action
on any matter may be taken at a meeting by teleconference, videoconference, or by written agreement. The JSC will attempt
to resolve any and all disputes before it for decision by consensus.

3.6.2    Escalation to Executive Officers. If the JSC is unable to reach consensus with respect to a dispute for a period in excess of
[**], then the dispute will be submitted to the Executive Officers of the Parties, or their designees (any such designee to be a
senior  member  of  the  designating  Executive  Officer’s  management  team),  for  resolution  in  accordance  with  Section  11.1
(Executive Officers; Disputes).

3.6.3    Final Decision-Making Authority.  If  the  Executive  Officers  of  the  Parties  are  not  able  to  agree  on  the  resolution  of  any
issue  referred  to  them  pursuant  to  Section  3.6.2  (Escalation  to  Executive  Officers)  within  [**]  after  such  issue  has  been
referred to them, then the matter will be decided as follows: (a) any dispute relating to (i) [**], (ii) [**], and (iii) [**], in each
case ((i) – (iii)), will be determined by the Executive Officer of

14

[**]; (b) any dispute relating to (i) [**], (ii) [**], or (iii) [**], in each case ((i) – (iii)), will be determined by the Executive
Officer  of  [**];  and  (c)  neither  Party  will  have  final  decision-making  authority  with  respect  to  any  other  dispute  and  the
status quo will persist (or, if applicable, no decision will be implemented) with respect to such matter unless and until the
Parties reach agreement thereon.

3.7    Limitations on Decision Making. Notwithstanding any provision to the contrary set forth in this Agreement, without the other Party’s
prior  written  consent,  no  decision  of  the  JSC  or  a  Party’s  Executive  Officer  (in  the  exercise  of  a  Party’s  final  decision  making
authority on any such matters), in each case, may (a) result in a material increase in the other Party’s obligations, costs or expenses
under this Agreement, (b) require the other Party to take any action that such other Party reasonably believes would (i) require such
other  Party  to  violate  any  Applicable  Law,  the  requirements  of  any  Regulatory  Authority,  or  any  agreement  with  any  Third  Party
entered into by such other Party or (ii) require such other Party to infringe or misappropriate any intellectual property rights of any
Third  Party,  (c)  impose  any  obligation  on  either  Party  that  would  be  in  violation  of  such  Party’s  written  standard  operating
procedures,  written  business  policies,  or  written  compliance  policies  or  procedures,  (d)  conflict  with  this  Agreement,  the  Quality
Agreement to be entered into by the Parties or the Pharmacovigilance Agreement or any other agreement between the Parties related
to  the  subject  matter  set  forth  herein,  (e)  have  a  material  adverse  effect  on  the  Development  or  Commercialization  of  Licensed
Products outside the Territory, or (f) modify the terms of this Agreement.

3.8    Alliance Managers. Each of the Parties will appoint a single individual to manage Development and Commercialization obligations
between the Parties (each, an “Alliance Manager”). The role of the Alliance Manager is to act as a single point of contact between
the Parties to ensure a successful relationship under this Agreement. The Alliance Managers will attend all JSC meetings. Alliance
Managers will be non-voting participants in all JSC meetings. Each Party will designate its initial Alliance Manager promptly after
the Effective Date and each Party may change its designated Alliance Manager at any time upon written notice to the other Party.

4.

4.1.

4.2.

DEVELOPMENT, MANUFACTURING, REGULATORY, AND COMMERCIALIZATION

General Responsibilities. Except as expressly provided herein or expressly set forth in this Agreement, the Supply Agreement, or as
otherwise  agreed  by  the  Parties  in  writing,  as  between  the  Parties  with  respect  to  the  Licensed  Product  in  Field  in  the  Territory,
Licensee will be solely responsible for managing and conducting all Development and Commercialization activities, and the Parties
will be responsible for managing and conducting all Manufacturing activities as described in Section 4.6 (Licensee Manufacturing
Process  Development),  Section  4.7  (Licensee  Manufacturing  Process  Completion  and  Transfer),  Section  4.8  (Licensee
Manufacturing Process Completion – No Minimum Royalties) and Section 4.9 (Supply Agreement). Licensee will be responsible for
all costs and expenses related to the Development and Commercialization of the Licensed Product in the Territory after the Effective
Date.

Regulatory.  Licensee  or  one  of  its  Affiliates  will  be  responsible  for  all  regulatory  activities  and  interactions  with  Regulatory
Authorities in the Territory leading up to and including obtaining (to the extent not already obtained) and thereafter maintaining, all
Regulatory Approvals and any Reimbursement Approvals, as applicable, for the Licensed Product in the Territory in Licensee’s or its
Affiliate’s own name.

4.2.1    Letter of Authorization. Promptly following the Effective Date, Akebia will provide Licensee with a letter of authorization
that grants to Licensee those rights and permissions required to: (a) prepare and submit a request for scientific advice from
the  EMA  and  (b)  under  confidentiality  agreements  that  contain  restrictions  no  less  stringent  than  those  set  forth  in  this
Agreement, contact CMOs to evaluate the costs and expenses

15

associated with performing the final steps in the Manufacture of the Licensed Product in Finished Form.

4.2.2    Regulatory Submissions. From and after the Effective Date, Licensee will be responsible, at its sole cost and expense, for
preparing,  filing,  and  submitting,  directly  or  through  its  Affiliates  and  permitted  Sublicensees,  (a)  all  Regulatory
Submissions in all countries and jurisdictions in the Territory, and each material amendment or update thereto, in its name;
and (b) briefing packages for meetings with Regulatory Authorities relating to Regulatory Submissions in each such country
and  jurisdiction  in  the  Territory  for  such  Licensed  Product.  Akebia  will  reasonably  cooperate  in  a  timely  manner  (i.e.,  in
accordance with the timelines imposed by the Regulatory Authorities) with Licensee in obtaining any Regulatory Approvals
and Reimbursement Approvals, as applicable, for the Licensed Product in the Territory by providing access to Regulatory
Approvals, Regulatory Submissions, clinical data, and other data, information, and documentation for the Licensed Product
that is relevant to obtaining or maintaining Regulatory Approval for the Licensed Product in the Field in the Territory, to the
extent Controlled by Akebia. In the event Akebia determines in its sole discretion that Licensee’s request for cooperation by
Akebia is not reasonable, then Licensee and Akebia will meet and discuss regarding such requested cooperation. The Parties
acknowledge and agree that Akebia may determine in its sole discretion whether any requested cooperation by Licensee is
reasonable,  and  that  Akebia  has  no  obligation  to  provide  any  assistance  to  Licensee  under  this  Section  4.2.2  (Regulatory
Submissions).  If  Akebia  provides  any  such  requested  cooperation  to  Licensee  pursuant  to  this  Section  4.2.2  (Regulatory
Submissions), then Akebia will provide to Averoa a good faith calculation of the costs and expenses incurred by Akebia in
connection with such cooperation, and the Parties will discuss in good faith whether Averoa will reimburse Akebia for such
costs  and  expenses.  For  clarity,  Akebia  will  not  be  required  to  expend  any  resources,  whether  internal  or  external,  in
connection  with  the  Development  of,  including  obtaining  or  maintaining  Regulatory  Approval  for,  the  Licensed  Product
unless  expressly  agreed  by  Akebia  in  writing.  Licensee  will  provide  to  Akebia  for  review  and  comment  drafts  of  all
Regulatory  Submissions  in  the  Territory  for  the  Licensed  Product.  Licensee  will  consider  in  good  faith  and,  where
appropriate, incorporate any such comments received from Akebia on such Regulatory Submissions. In  addition,  Licensee
will  notify  Akebia  of  any  Regulatory  Submissions  for  the  Licensed  Product  and  any  comments  or  other  correspondences
related thereto submitted to or received from any Regulatory Authority in the Territory and will provide Akebia with copies
thereof  as  soon  as  reasonably  practicable,  but  in  all  events  within  [**]  after  submission  or  receipt  thereof  (or  such  longer
time  period  as  may  be  necessary  to  obtain  translations  thereof).  If  any  such  Regulatory  Submission,  comment,  or
correspondence  is  not  in  English,  then  Licensee  will  provide  Akebia  with  a  certified  English  translation  as  soon  as
practicable after receipt of such Regulatory Submission, comment, or correspondence, at Licensee’s sole cost and expense.
Akebia will have the right, but not the obligation, to review and comment on all such Regulatory Submissions, and Licensee
will consider in good faith and incorporate such comments where appropriate.

4.2.3    Meetings with Regulatory Authorities. Licensee will provide Akebia with notice of any meeting or discussion with any
Regulatory Authority in the Territory related to the Licensed Product no later than [**] after receiving notice thereof or in
any event with as much advanced notice as is possible prior to such meeting or discussion if Licensee receives notice thereof
less  than  [**]  in  advance  of  the  applicable  meeting  or  discussion.  Akebia  or  its  designee  will  have  the  right,  but  not  the
obligation, to have up to [**] representatives attend and participate in any such meeting or discussion unless prohibited or
restricted by Applicable Law or Regulatory Authority. Akebia will also have the right to attend any meetings of Licensee to
prepare for such meeting or discussion with Regulatory Authorities in the Territory (and Licensee will notify Akebia of all
such preparatory meetings sufficiently in advance thereof). If Akebia elects not to attend such meeting or discussion, then
Licensee  will  provide  to  Akebia  a  written  summary  thereof  in  English  promptly  following  such  meeting  or  discussion.
Akebia’s attendance of and

16

participation  in  any  meetings  or  discussions  with  Regulatory  Authorities  pursuant  to  this  Section  4.2.3  (Meetings  with
Regulatory Authorities) will be at its sole cost and expense.

4.2.4        Right  of  Reference.  Each  Party  will  grant,  and  hereby  does  grant,  to  the  other  Party  and  its  Affiliates,  licensees,  and
Sublicensees a right of reference to all Regulatory Submissions pertaining to the Licensed Product in the Field submitted by
or on behalf of such Party or its Affiliates. Licensee will grant, and hereby does grant, to Akebia and its Affiliates, licensees
(including [**]), and Sublicensees a right of reference to all Licensee Development Data developed in Licensee’s activities
under this Agreement. Licensee and its Affiliates and Sublicensees may use such right of reference to Akebia’s Regulatory
Submissions  solely  for  the  purpose  of  seeking,  obtaining,  supporting,  and  maintaining  Regulatory  Approvals  and  any
Reimbursement  Approvals,  as  applicable,  for  the  Licensed  Product  in  the  Field  in  the  Territory.  Akebia  and  its  Affiliates,
licensees, and Sublicensees may use such right of reference to Licensee’s Regulatory Submissions solely for the purpose of
seeking,  obtaining,  supporting,  and  maintaining  Regulatory  Approval  and  any  Reimbursement  Approvals  of  the  Licensed
Product outside of the Territory. Each Party will bear its own costs and expenses associated with providing the other Party
with the right of reference pursuant to this Section 4.2.4 (Right of Reference). Each Party will take such actions as may be
reasonably requested by the other Party to give effect to the intent of this Section 4.2.4 (Right of Reference) and to give the
other Party the benefit of the granting Party’s Regulatory Submissions in the other Party’s territory as provided herein. Such
actions may include providing to the other Party copies of correspondence and communications received from the applicable
Regulatory Authorities related to such Party’s application for Regulatory Approval of the Licensed Products in the Territory
or outside of the Territory, as applicable.

4.3    Development in the Territory.

4.3.1. Development Responsibilities; Development Plan. Licensee will be responsible for, and will conduct, any Development of
the  Licensed  Product  that  is  necessary  to  obtain  and  maintain  Regulatory  Approval  of  the  Licensed  Product  in  the  Target
Indication in the Territory, including the conduct of all Post-Approval Studies. All such Development to be conducted by or
on behalf of Licensee, including any non-clinical, pre-clinical, and clinical Development of the Licensed Product, whether
for the Target Indication or any other indication, will be in accordance with and governed by a development plan submitted
by Licensee to the JSC (the “Development Plan”). Licensee will submit a draft of the initial Development Plan to the JSC
following  the  validation  of  the  Target  Indication  by  a  Regulatory  Authority.  Licensee  will  not  conduct  any  Development
activities for the Licensed Product other than as set forth in the Development Plan. If Licensee wishes to make a change to
the  Development  Plan,  including  to  include  Additional  Development  activities,  then  Licensee  will  submit  the  proposed
updated  to  the  Development  Plan  to  the  JSC.  The  JSC  will  review,  discuss,  and  determine  whether  to  approve  any  such
proposed update. Each such update to the Development Plan will become effective and will supersede the previous iteration
of the Development Plan upon approval thereof by the JSC.

4.3.2. Pediatric  Investigation  Plan.  The  Parties  will  discuss  in  good  faith  whether,  based  on  the  pediatric  investigation  plan
approved by the EMA for the Licensed Product in the Target Indication, Licensee will be able to use, in the Territory, the
Akebia Pediatric Data. If the Parties agree that Licensee will be able to use such Akebia Pediatric Data, then the Parties will
use good faith efforts to negotiate and agree upon (a) a collaborative arrangement pursuant to which Akebia would grant to
Licensee  a  license  to  use  and  rely  on  such  Akebia  Pediatric  Data,  as  well  as  any  considerations  or  amendments  to  such
clinical trials that are part of Akebia’s pediatric investigation plan that might be made such that Licensee would be able to
use in its Regulatory Submissions for the Licensed Product in the Territory the data generated from the performance thereof;
provided that Akebia will not be required to modify the protocol of any previously initiated clinical trials that may be part of
Akebia’s pediatric investigation plan, and (b) a cost sharing

17

arrangement  between  the  Parties  with  respect  to  the  costs  and  expenses  associated  with  the  performance  of  those  clinical
trials  described  in  clause  (a)  of  this  Section  4.3.2  (Pediatric  Investigation  Plan).  For  clarity,  Licensee’s  costs  incurred  in
connection with any such pediatric investigation plan will not exceed [**] percent ([**]%) of the total costs of the pediatric
clinical trials, up to a maximum amount of [**] United States Dollars, VAT excluded.

4.3.3. Development Diligence Obligations. Licensee will be responsible for and will use Commercially Reasonable Efforts (a) to
conduct  all  Development  of  the  Licensed  Product  that  is  necessary  to  obtain  or  maintain  Regulatory  Approval  and
Reimbursement Approval, where applicable, for the Licensed Product in the Territory in the Target Indication and (b) to file
for Regulatory Approval and Reimbursement Approval for the Licensed Product in the Territory in the Target Indication.

4.3.4. Additional Development. If Licensee desires to conduct any Development of the Licensed Product in the Territory for any
indication other than the Target Indication (“Additional Development”), then Licensee will present a proposal to the JSC to
review, discuss, and determine whether to approve pursuant to Section 3.4 (Specific Responsibilities of the JSC), including a
synopsis of the Development activities related to such Additional Development, the potential role of Akebia with respect to
such Additional Development (provided that  Akebia  has  no  obligation  to  participate  in  any  Additional  Development),  the
timeline  for  the  performance  of  such  Additional  Development,  the  estimated  costs  and  expenses  associated  with  such
Additional  Development,  and  a  proposed  amendment  to  the  then-current  Development  Plan  to  include  Additional
Development activities. Licensee will not conduct any Additional Development without Akebia’s prior written consent. In
the event Akebia conducts any Additional Development in the Territory, it will provide notice thereof to the JSC and the JSC
may review and discuss such Additional Development and related activities.

4.3.5. Target  Indication.  Licensee  may  propose  to  modify  the  Target  Indication  from  time  to  time  and  will  submit  all  such
proposals to the JSC to review and discuss. Following review of and discussion at the JSC of any such proposals, the Target
Indication will be deemed updated or modified upon written notice from Licensee to the JSC of such update or modification.

4.3.6. Development Costs. Except as otherwise set forth in this Agreement, Licensee will be responsible for all costs and expenses

related to the Development of the Licensed Product in the Territory after the Effective Date.

4.3.7. Licensee Development Data. Licensee will grant, and hereby does grant, to Akebia and its Affiliates, licensees (including
[**]),  and  Sublicensees  a  right  to  use  all  Licensee  Development  Data  developed  in  Licensee’s  activities  under  this
Agreement.  Licensee  acknowledges  and  agrees  that  Akebia  may  provide  the  Licensee  Development  Data  to  [**]  on  a
continuing basis. Each Party will take such actions as may be reasonably requested by the other Party to give effect to the
intent of this Section 4.3.7 (Licensee Development Data).

4.4    Commercialization.

4.4.1. Launch Sequence. No later than [**] following Licensee’s submission of the MAA for the Licensed Product to the EMA,
Licensee will prepare and submit to the JSC for its review and discussion a list of those countries in the Territory in which
Licensee intends to Commercialize the Licensed Product and timelines reflecting the target date of the First Commercial Sale
(the  “Launch  Sequence”,  and  the  countries  included  in  the  Launch  Sequence,  the  “Launch  Countries”).  Licensee  will
amend or update the Launch Sequence at least [**] thereafter, including updating such sequence so as to provide reasonable
prior notice of the target date of the First Commercial Sale in any additional countries in the Territory not included in the
initial Launch Sequence. Each amendment

18

and  update  to  the  Launch  Sequence  will  be  reviewed  and  discussed  by  the  JSC  pursuant  to  Section  3.4  (Specific
Responsibilities of the JSC).

4.4.2. Progress Reports. No later than [**] after the end of each [**] during the Term, Licensee will provide to Akebia a written
high-level summary of Licensee’s or its Affiliates’ or Sublicensees’ progress and activities performed since the prior report,
and planned for the upcoming [**], in each case, with respect to the Commercialization of the Licensed Product throughout
the Territory.

4.4.3. Commercialization Plan. No later than [**] following Licensee’s submission of the MAA dossier for the Licensed Product
to  the  EMA,  Licensee  will  prepare  and  submit  to  the  JSC  for  its  review  and  discussion  a  Commercialization  Plan.  Such
Commercialization  Plan  will  be  a  high-level  strategic  plan  for  Commercialization  of  the  Licensed  Product  throughout  the
Territory,  and  will  include  overall  pricing  strategy,  sales,  and  supply  forecasts  for  the  Licensed  Product  throughout  the
Territory and method for launch.

4.4.4. Commercial  Diligence  Obligations.  During  the  Term,  Licensee  will  use  Commercially  Reasonable  Efforts  to
Commercialize the Licensed Product in the Field in each Country in the Territory for which Regulatory Approval has been
obtained.

4.5    Breach of Diligence Obligations. Without limiting Akebia’s rights under Section 10.2 (Termination for Breach), if at any time during
the  Term  Akebia  has  a  reasonable  basis  to  believe  that  Licensee  is  in  material  breach  of  its  obligations  under  Section  4.3.3
(Development  Diligence  Obligations)  or  Section  4.4.4  (Commercialization  Diligence  Obligations),  then  Akebia  may  so  notify
Licensee, specifying the basis for its belief, and, at Akebia’s request, the appropriate representatives of each Party will meet within
[**] after such notice to discuss in good faith Akebia’s concerns, and Licensee’s plans, with respect to Licensee’s compliance with its
obligations under Section 4.3.3 (Development Diligence Obligations) or Section 4.4.4 (Commercialization Diligence Obligations), as
applicable to the notice so provided by Akebia.

4.6          Licensee  Manufacturing  Process  Development.  Licensee  may  develop  a  drug  product  manufacturing  process  for  the  Licensed
Product (the “Licensee Manufacturing Process”), at its own cost and expense. If Licensee requires any technical assistance from
Akebia  in  the  development  of  the  Licensee  Manufacturing  Process  during  the  first  [**]  of  the  Term,  then  Akebia,  upon  written
request  of  Licensee  and  agreement  by  the  Parties,  will  provide  reasonable  cooperation  and  technical  assistance  to  Averoa  in  such
development. Such  reasonable  cooperation  and  assistance  may  include,  at  Akebia’s  discretion  and  agreement,  (a)  providing  Drug
Substance  for  use  solely  in  connection  with  the  development  of  the  Licensee  Manufacturing  process  (and  not,  for  clarity,  for
commercialization purposes), in amounts to be determined by Akebia in its sole discretion, or (b) allocating Akebia employees to
support  the  development  of  the  Licensee  Manufacturing  Process.  Upon  Akebia’s  request,  Licensee  will  reimburse  Akebia  for  all
costs incurred in connection with Akebia’s assistance in developing the Licensee Manufacturing Process upon terms to be agreed by
the Parties, such terms to be agreed upon prior to Akebia providing assistance.

4.7    Licensee Manufacturing Process Completion and Transfer. If Licensee successfully develops the Licensee Manufacturing Process

pursuant to Section 4.6 (Licensee Manufacturing Process Development), then:

4.7.1    Upon Akebia’s written request, Licensee will transfer to Akebia or its designees all analytical and manufacturing Know-How,
including  all  data  and  documentation  related  thereto,  related  to  the  Licensee  Manufacturing  Process  that  is  Controlled  by
Licensee  or  any  of  its  Affiliates  and  is  necessary  or  useful  to  enable  Akebia  to  Manufacture  Licensed  Product  using  the
Licensee Manufacturing Process;

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4.7.2    Akebia will bear the costs and expenses related to the activities carried out in accordance with Section 4.7.1 (such activities,

the “Manufacturing Technology Transfer”); and

4.7.3        Akebia  will  reimburse  Licensee  for  all  costs  incurred  in  connection  with  Licensee’s  assistance  in  the  Manufacturing
Technology Transfer upon terms to be agreed by the Parties, which terms will be agreed by the Parties in writing prior to
Licensee providing assistance.

4.8.        Licensee  Manufacturing  Process  Completion  –  No  Minimum  Royalties.  Effective  upon  the  date  that  Licensee  completes
development  of  the  Licensee  Manufacturing  Process  pursuant  to  Section  4.6  (Licensee  Manufacturing  Process  Development),
Licensee will no longer be obligated to pay the Minimum Royalties to Akebia set forth in Section 5.1.3 (Minimum Royalties). For
clarity, nothing in this Section 4.8 (Licensee Manufacturing Process Completion – No Minimum Royalties) will affect the Licensee’s
obligation to pay to Akebia the Incremental Royalties, as described in Section 5.1.2 (Incremental Royalties).

4.9.    Supply Agreement. Promptly following the Effective Date, the Parties will negotiate in good faith and execute a supply agreement
consistent  with  the  terms  and  conditions  of  this  Agreement  (the  “Supply  Agreement”),  pursuant  to  which  Akebia  will  supply
Licensee or its designee with Licensed Product in brite stock for commercial use in the Territory in connection with this Agreement.
The terms and conditions of the Supply Agreement will be reasonable and customary for agreements of this type, and will include the
terms and conditions set forth in this Section 4.9 (Supply Agreement).

4.9.1        Supply  Price.  The  Supply  Agreement  will  provide  that  the  supply  price  for  the  Licensed  Product  will  be  equal  to  its

applicable [**] (the “Supply Price”).

4.9.2    Supply Termination Right. The Supply Agreement will provide that Akebia may terminate the Supply Agreement for any
reason upon 24 months’ prior written notice to Averoa, which notice Akebia may provide to Licensee on or after January 1,
2024 (such right to terminate, “Supply Termination Right”); provided that if Akebia delivers such notice of termination of
the  Supply  Agreement  to  Licensee  prior  to  Licensee’s  submission  of  the  MAA  for  the  Licensed  Product  to  the  EMA  or
during the period in which the EMA is reviewing of such MAA submission, then the termination of the Supply Agreement
will  be  effective  on  the  date  that  is  [**]  following  the  earlier  of  (a)  the  EMA’s  decision  regarding  Licensee’s  MAA
submission for the Licensed Product or (b) [**] after the date of the Licensee’s MAA submission to the EMA.

4.9.3        Supply Agreement Termination Consequences.  The  Supply  Agreement  will  provide  that  if  Akebia  exercises  its  Supply

Termination Right, then:

(a)

(b)

(c)

Effective upon the date of termination of the Supply Agreement, Licensee will no longer be obligated to pay any
Minimum Royalties to Akebia pursuant to Section 5.1.3 (Minimum Royalties);

Licensee  will  have  the  option  to  request  in  writing  that  Akebia  assign  to  Licensee  its  then-existing  supply
agreements  with  Third  Party  manufacturers  relating  solely  to  the  Licensed  Product,  and  Akebia  will  use
reasonable efforts to assign such agreements to Licensee;

If Akebia assigns to Licensee its then-existing supply agreements with Third Party manufacturers relating solely
to Licensed Product to Licensee in accordance with Section 4.9.3(b), then Licensee will not be obligated to pay
to Akebia any Incremental Royalties owed pursuant to Section 5.1.2(a) or Section 5.1.2(b) for [**]; and

20

(d)

Licensee  may  defer  payment  of  the  Incremental  Royalties  due  during  the  [**]  in  which  the  assignment  of
Akebia’s supply agreements occurs pursuant to Section 4.9.3(b) (the “Deferred Royalties”) until [**], on which
date  such  Deferred  Royalties  will  become  due  and  payable.  For  clarity,  nothing  in  Section  4.9.3(c)  or  this
Section 4.9.3(d) will affect the Licensee’s obligation to pay to Akebia the Base Royalties.

4.9.4    Exclusive Supplier. Licensee will purchase exclusively from Akebia all of Licensee’s and its Affiliates’ and Sublicensees’
requirements  for  the  Licensed  Product, to  the  extent  Akebia  is  able  to  manufacture  and  supply  to  Licensee  and  its  Affiliates  and
Sublicensees the quantities of Licensed Product as set forth under the Supply Agreement.

4.9.5    Additional Formulations. If additional formulations of the Licensed Product are required for use in the Field in the Territory
(such  as  for  pediatric  use),  then  the  Parties  will  discuss  such  requirements  through  the  JSC.  If  Akebia  agrees  to  participate  in  the
Development  and  Manufacture  of  such  additional  formulations,  then  the  Parties  will  discuss  in  good  faith  and  agree  upon  the
applicable  process  and  respective  responsibilities  of  each  Party  in  connection  with  such  activities  and  an  appropriate  cost  sharing
arrangement between the Parties for the costs and expenses to be incurred in the performance of such activities.

4.9.6    Quality Agreement. As soon as reasonably practicable after the Effective Date, the Parties will negotiate in good faith and
execute a related quality agreement consistent with the terms and conditions of this Agreement and the Supply Agreement, governing
the supply of Licensed Product under this Agreement (the “Quality Agreement”).

4.9.7        Licensee  Responsibilities.  Licensee  will  be  responsible,  at  its  cost  and  expense,  for  converting  brite  stock  of  Licensed
Product supplied by Akebia into Finished Form, including supplying all Packaging and Labeling for use of the Licensed Product in
the Territory, and serialization and release of the Licensed Product in Finished Form.

4.10    Trademarks.

4.10.1        Housemarks.  Licensee  will  be  responsible  for  the  registration  and  maintenance  of  the  Product  Marks  and  the  Licensee
Housemarks  throughout  the  Territory,  as  well  as  all  expenses  associated  therewith.  Akebia  will  be  responsible  for  the
registration  and  maintenance  of  the  Akebia  Housemarks  throughout  the  Territory,  as  well  as  all  expenses  associated
therewith.

4.10.2    Ownership; Branding. Licensee will develop and prosecute, when appropriate following the Effective Date, at least [**] in
the Territory. Licensee will be the sole and exclusive owner of all Product Marks, including all trademark registrations and
applications therefor and all goodwill associated therewith. To the extent Akebia acquires any rights, title, or interests in and
to any Product Mark (including any trademark registration or application therefor or goodwill associated with any Product
Mark), Akebia will, and hereby does, assign the same to Licensee. Licensee will use the Product Marks as the primary and
most  prominent  trademark  and  logo  associated  with  the  Licensed  Product  throughout  the  Territory.  Licensee  may  use  the
Licensee Housemarks and, subject to Section 4.10.3 (Trademark License), the Akebia Housemarks on the packaging of the
Licensed Product. The Parties, acting through the JSC, will agree upon any other Marks to be used in the Commercialization
of  the  Licensed  Product  in  the  Territory.  Upon  the  termination  or  expiration  of  this  Agreement,  Licensee  agrees  to,  and
hereby  does,  (a)  assign  all  rights,  title,  and  interest  in  and  to  all  Product  Marks  (including  any  trademark  registration  or
application therefor), and all goodwill associated with all Product Marks and (b) grant to Akebia, during the transition period
following the effective date of termination or expiration of this Agreement and ending on that date that Akebia is designated
as the MA Holder of the Licensed Product in the Territory, a non-exclusive, royalty-free, perpetual, irrevocable, fully-paid up
license under the Licensee Housemarks to Exploit the Licensed Product in the Territory. To the extent following

21

such  termination  or  expiration  Licensee  acquires  any  rights,  title,  or  interests  in  and  to  any  Product  Mark  (including  any
trademark registration or application therefor or goodwill associated with any Product Mark) during such transition period,
Licensee will, and hereby does, assign the same to Akebia.

4.10.3        Trademark  License.  Subject  to  the  terms  and  conditions  of  this  Agreement  (including  Section  2.6  (Retained  Rights)),
Akebia hereby grants and agrees to grant to Licensee a non-exclusive, sublicensable (subject to Section 2.2 (Licensee’s Right
to Grant Sublicenses)), royalty-free license to use the Akebia Housemarks to the extent required for the Approved Labeling
for  the  Licensed  Product  or  requested  by  Akebia  and  subject  to  Applicable  Law,  solely  in  connection  with  the
Commercialization  of  the  Licensed  Product  in  the  Territory  in  accordance  with  to  this  Agreement  (the  “Trademark
License”). All goodwill arising from Licensee’s use of the Akebia Housemarks in the Territory will inure to the benefit of
Akebia.

4.10.4    Quality Control. As a condition of the Trademark License, Licensee agrees that it and its Affiliates and Sublicensees will:
(a)  ensure  that  all  Licensed  Products  that  are  sold  bearing  the  Akebia  Housemarks  are  of  a  high  quality  consistent  with
industry  standards  for  global  pharmaceutical  and  biologic  therapeutic  products;  (b)  ensure  that  each  use  of  the  Akebia
Housemarks  by  Licensee  and  its  Affiliates  and  Sublicensees  is  accompanied  by  an  acknowledgement  that  such  Akebia
Housemarks  are  owned  by  Akebia;  (c)  not  use  such  Akebia  Housemarks  in  a  way  that  might  materially  prejudice  their
distinctiveness  or  validity  or  the  goodwill  of  Akebia  therein  and  includes  the  trademark  registration  symbol  ®  or  ™  as
appropriate;  (d)  not  use  any  trademarks  or  trade  names  so  resembling  any  of  such  Akebia  Housemarks  as  to  be  likely  to
cause confusion or deception; and (e) place and display the Product Marks on and in connection with the Licensed Products
in  a  way  that  acknowledges  Akebia’s  role  in  discovering  the  Licensed  Products  and  that  such  Licensed  Product  is  under
license from Akebia. In addition, Licensee will abide by any commercially reasonable brand guidelines provided by Akebia
to Licensee reasonably in advance of Licensee’s first use of any of the Akebia Housemarks.

4.11        Pharmacovigilance.  No  later  than  [**]  after  the  Effective  Date,  the  Parties  will  develop  and  agree  in  writing  upon  a
pharmacovigilance agreement (“Pharmacovigilance Agreement”) that will include safety data exchange procedures governing the
coordination  of  collection,  investigation,  reporting,  and  exchange  of  information  concerning  any  adverse  experiences  and  any
product  quality  and  product  complaints  involving  adverse  experiences,  related  to  the  Licensed  Product,  sufficient  to  enable  each
Party  to  comply  with  its  legal  and  regulatory  obligations.  Licensee  will  bear  all  costs  and  expenses  associated  with
pharmacovigilance activities related to the Licensed Product in the Territory. The Pharmacovigilance Agreement will contain terms
no  less  stringent  than  those  required  by  ICH  or  other  applicable  guidelines  in  order  to  allow  the  Parties  to  meet  the  applicable
regulatory and legal requirements regarding the management of safety data within and outside the Territory.

5.

PAYMENTS

5.1.

Royalty Payments.

5.1.1        Base  Royalties.  In  addition  to  the  amounts  payable  to  Akebia  under  Section  5.1.2  (Incremental  Royalties),  during  each
Calendar  Quarter,  Licensee  will  pay  to  Akebia  an  amount  equal  to  [**]%  of  Net  Sales  of  the  Licensed  Product  in  the
Territory  (the  “Base  Royalties”)  during  the  Royalty  Term.  Upon  the  expiration  of  the  [**],  the  Base  Royalties  will  be
reduced to [**]% of Net Sales of the Licensed Product in the Territory if [**].

5.1.2    Incremental Royalties. In addition to the Base Royalties, Licensee will pay to Akebia, with respect to sales of the Licensed
Product in the Territory during the Royalty Term for the applicable country, an amount equal to (such payments collectively,
“Incremental Royalties”, and together with the Base Royalties, “Royalties”):

22

(a)

(b)

(c)

(d)

(e)

[**]% of Net Sales for the portion of aggregate Net Sales of the Licensed Product in the Territory in any Calendar
Year less than or equal to €[**]; provided that for the first [**] following the First Commercial Sale in the Territory
the Royalty due on Net Sales for the portion of aggregate Net Sales of the Licensed Product in the Territory in any
Calendar Year less than or equal to €[**] will be [**]%; plus

[**]% of Net Sales for the portion of aggregate Net Sales of the Licensed Product in the Territory in any Calendar
Year greater than €[**] and less than or equal to €[**]; plus

[**]% of Net Sales for the portion of aggregate Net Sales of the Licensed Product in the Territory in any Calendar
Year greater than €[**] and less than or equal to €[**]; plus

[**]% of Net Sales for the portion of aggregate Net Sales of the Licensed Product in the Territory in any Calendar
Year greater than €[**] and less than or equal to €[**]; plus

[**]% of Net Sales for the portion of aggregate Net Sales of the Licensed Product in the Territory in any Calendar
Year greater than €[**].

5.1.3        Minimum  Royalties.  If  the  Incremental  Royalties  in  a  Calendar  Year  set  forth  in  the  table  below  in  this  Section  5.1.3
(Minimum  Royalties)  during  Term  equal  an  amount  less  than  the  Minimum  Royalty  set  forth  opposite  the  applicable
Calendar Year, then Licensee will pay to Akebia an amount equal to the difference of the applicable Minimum Royalty and
the Incremental Royalties paid to Akebia in such Calendar Year (each such amount, the “Minimum Royalty”).

Calendar Year

Minimum Royalty

Year 1

Year 2

Year 3

Each Calendar Year following Year 3

[**]

[**]

[**]

[**]

As used in this Section 5.1.3 (Minimum Royalties), the following capitalized terms will have the meanings set forth opposite
them:

“Year 1” will mean the date that is the earlier of (i) [**] and (ii) [**];

“Year 2” will mean the date that is the earlier of (i) [**] and (ii) [**]; and

“Year 3” will mean the date that is the earlier of (i) [**] and (ii) [**].

5.1.4        Timing  of  Payments. Royalty  and  Minimum  Royalty  payments  (as  applicable)  will  be  due  at  the  same  time  as  a  written

report for a given Calendar Quarter is due as set forth in Section 5.1.6 (Royalty Reports and Records).

23

5.1.5    Flash Reports. No later than [**] after the end of each Calendar Quarter during the Term, Licensee will provide to Akebia a
“flash” report that will set forth (a) for the first and second month of such Calendar Quarter: (i) the actual gross sales of the
Licensed Product sold by Licensee and its Affiliates and Sublicensees in the Territory in such months; and (ii) the actual total
aggregate  Net  Sales  of  the  Licensed  Product  sold  by  Licensee  and  its  Affiliates  and  Sublicensees  in  the  Territory  in  such
months, and (b) for the third month of such Calendar Quarter, Licensee’s good faith estimate of the amounts set forth in the
foregoing clauses (a)(i) and (a)(ii).

5.1.6        Royalty Reports and Records. In  addition  to  the  “flash”  reports  to  be  provided  in  accordance  with  Section  5.1.5  (Flash
Reports),  beginning  with  the  First  Commercial  Sale  by  Licensee  or  any  Sublicensee,  as  the  case  may  be,  of  the  Licensed
Product in any country in the Territory, and continuing thereafter during the Term, Licensee will furnish, and will cause any
Sublicensee  to  furnish,  to  Akebia  a  written  report  covering  each  such  Calendar  Quarter showing  (a)  the  Net  Sales  of  the
Licensed Product in each country of the Territory during such Calendar Quarter; (b) the Royalties, payable in Euros, that will
have  accrued  hereunder  in  respect  of  such  sales  with  a  computation  of  such  royalties  during  such  Calendar  Quarter;  (c)
withholding taxes, if any, required by Applicable Law to be deducted in respect of such sales in such Calendar Quarter; and
(d) the exchange rates used in determining the amount of United States Dollars payable in respect of sales made other than in
Euros. Licensee will deliver such written report to Akebia no later than [**] after the end of each such Calendar Quarter and
pay any Royalties or Minimum Royalties (as applicable) due for such Calendar Quarter no later than [**] after the end of
each such Calendar Quarter. For each written report delivered to Akebia pursuant to this Section 5.1.6 (Royalty Reports and
Records) that covers the end of a Calendar Year in which a Minimum Royalty is due, as set forth in the table in Section 5.1.3
(Minimum Royalties), such written report will also indicate whether a Minimum Royalty, if any, is due to Akebia for such
Calendar  Year,  and,  if  so,  the  amount  of  such  Minimum  Royalty.  With  respect  to  sales  of  Licensed  Product  invoiced  in  a
currency other than Euros, the Net Sales and royalty payable will be expressed in the domestic currency of the party making
the sale together with the Euro equivalent of the royalty payable, calculated using the simple average of the exchange rate
published in the Wall Street Journal on the last day of each month of the Calendar Quarter. If  any  sales  are  invoiced  in  a
currency other than its domestic currency, then the Net Sales will be converted to its domestic currency in accordance with
its  normal  accounting  principles.  Licensee  will  furnish  to  Akebia,  upon  request,  appropriate  evidence  of  payment  of,  and
itemize any tax, credits, or specific amount deducted from any royalty payment.

5.2    Late Payments; Disputed Payments. Any amount owed by a Party to the other Party under this Agreement that is not paid within the
applicable time period set forth herein will accrue interest at the lesser of (a) the prime rate as quoted by Citibank NA plus [**]%, or
(b) the highest rate permitted under Applicable Law. If a Party disputes an invoice or other payment obligation under this Agreement,
then such Party will timely pay the undisputed amount of the invoice or other payment obligation, and the Parties will resolve such
dispute in accordance with Article 11 (Dispute Resolution; Governing Law).

5.3    Payment Method. Except as provided in Section 5.1.6 (Royalty Reports and Records), all payments from Licensee to Akebia will be
made within [**] following Licensee’s receipt of an invoice from Akebia, by wire transfer in Euros to the credit of such bank account
as  may  be  designated  by  Akebia  in  writing  to  Licensee  from  time  to  time.  Any  payment  that  falls  due  on  a  date  which  is  not  a
Business Day may be made on the next succeeding Business Day.

5.4    Taxes. If under any law or regulation of any country of the Territory withholding of taxes of any type, levies or other charges is required
with  respect  to  any  amounts  payable  hereunder  to  a  Party,  the  other  Party  (“Withholding  Party”)  will  apply  the  withholding  or
deduction as so required and will promptly pay such tax, levy, or charge to the proper Governmental Authority, and will promptly
furnish the Party with proof of such payment. The Withholding Party will have the right to withhold or deduct any such tax, levy, or
charge actually paid from payment due the Party

24

or be promptly reimbursed by the Party if no further payments are due the Party. Any  amounts  so  withheld  or  deducted  from  the
payment  due  the  Party  pursuant  to  the  relevant  law  or  regulation  will  be  deemed  paid  to  such  Party  for  all  purposes  of  this
Agreement. Each Withholding Party agrees to assist the other Party in claiming exemption from (or reduction in) such deductions or
withholdings under double taxation or similar agreement or treaty from time-to-time in force and in minimizing the amount required
to be so withheld or deducted. Notwithstanding the foregoing, all sums payable by either Party hereunder are stated exclusive of any
sales tax, value added tax, or other similar taxes, assessments, and charges imposed by the jurisdiction of the Withholding Party or
the payee and any such taxes will be paid by the Withholding Party.

5.5    Accounting; Audit. Licensee agrees to keep full, clear, and accurate records in accordance with the Accounting Standards applicable to
Licensee, consistently applied, for a period of at least [**] after the relevant payment is owed pursuant to this Agreement, setting
forth gross sales and Net Sales of the Licensed Product in sufficient detail to enable amounts owed or payable to Akebia hereunder,
to be determined. Licensee further agrees to permit its books and records to be examined by an independent accounting firm selected
by Akebia and reasonably acceptable to the Licensee to verify the royalty payments based on Net Sales (subject to such independent
accounting firm’s written obligations of confidentiality and non-use applicable to each Party’s Confidential Information that are at
least  as  stringent  as  those  set  forth  described  in  Article  7  (Confidentiality)).  Such  auditor  will  be  bound  by  a  legal  agreement
obligating it to maintain the confidentiality of such information. Such audit will not be (a) performed more frequently than [**], (b)
conducted for any Calendar Year more than [**] after the end of such year, or (c) repeated for any Calendar Year. If such audit shows
any  underpayment  of  royalties,  Licensee  will  pay  to  Akebia  the  amount  of  such  underpayment  no  later  than  [**]  after  Akebia’s
receipt of such audit report. Such examination is to be made at the expense of Akebia, except in the event that the results of the audit
reveal an underpayment, excess credit, or overcharge by Licensee of [**]% or more during the period being audited, in which case
reasonable audit fees for such examination will be paid by Licensee.

6.

INTELLECTUAL PROPERTY RIGHTS

6.1.

Ownership.

6.1.1    Akebia Intellectual Property. Ownership of the Akebia Technology will be and remain vested at all times in Akebia.

6.1.2    Licensee Improvements. Ownership of the Licensee Technology will be and remain vested at all times in Licensee. Without
limiting  the  generality  of  Licensee’s  obligations  under  Section  2.5.2  (By  Licensee),  Licensee  will  promptly  disclose  to
Akebia any Licensee Improvements, but no later than [**], after Licensee’s intellectual property department receives notice
of such conception or reduction to practice.

6.1.3    Joint Improvements.

(a)

(b)

The Parties will promptly disclose to each other any Joint Improvements, but no later than [**] after the applicable
Party’s intellectual property department receives notice of such conception or reduction to practice.

All Joint Improvements will be jointly owned by the Parties, with each Party entitled to the free use and enjoyment
of such Joint Improvements, but subject to the terms and conditions of this Agreement, including the license grants
under Article 2 (License Grants). Subject to the terms and conditions of this Agreement, neither Party will have a
duty to account to the other or seek any consent with respect to the licensing or practice of any Joint Improvements.
To  the  extent  any  further  consent  is  required  to  enable  a  Party  to  so  license  or  practice  its  interest  in  the  Joint
Improvements, the other Party will grant such consent promptly upon request.

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6.2.

Prosecution and Maintenance of Akebia Patent Rights and Joint Patent Rights.

6.2.1    Akebia’s First Right to Prosecute. As between the Parties, Akebia will have the first right, but not the obligation, to file,
prosecute, and maintain the Akebia Patent Rights and Joint Patent Rights using patent counsel of its own choosing.

6.2.2    Status Updates and Information Sharing. Akebia will consult with Licensee as to the prosecution and maintenance of the
Akebia Patent Rights and the Joint Patent Rights, including providing to Licensee for review all relevant material drafts and
documents reasonably prior to any deadline or submission to or action with any patent office. Akebia shall consider in good
faith any reasonable comments thereto provided by Licensee within a reasonable time following Licensee’s receipt of such
drafts and documents. If reasonably requested by Licensee, no more than [**], Akebia shall provide Licensee with an update
on  progress  with  regard  to  the  prosecution  and  maintenance  of  such  Akebia  Patent  Rights  and  Joint  Patent  Rights,  and
Akebia shall provide to Licensee copies of all patent office submissions and material correspondence directly related to the
Akebia Patent Rights and the Joint Patent Rights within a reasonable amount of time following submission or receipt thereof
by Akebia. Akebia will provide notice to Licensee of, and the Parties will discuss, any significant actions to be taken with
respect to the Akebia Patent Rights or Joint Patent Rights reasonably prior to any associated deadline.

6.2.3        Assistance; Costs.  Licensee  undertakes  to  reasonably  assist  Akebia  with  respect  to  the  filing,  prosecution,  issuance,  and
maintenance  of  the  Akebia  Patent  Rights  and  Joint  Patent  Rights,  without  cost  to  Licensee,  to  provide  to  Akebia  the
necessary documents available to Licensee and render all signatures that will be necessary for Akebia Patent Right and Joint
Patent Right filings, and to assist Akebia in all other reasonable ways that are necessary for the issuance of the Akebia Patent
Rights and Joint Patent Rights, as well as for the prosecution and maintenance of such Patent Rights. Akebia will provide to
Licensee on at least an [**], and the Parties will review and discuss with each Party’s intellectual property counsel, a budget
of  the  estimated  costs  and  expenses  expected  to  be  incurred  by  or  on  behalf  of  Akebia  in  connection  with  the  filing,
prosecution, and maintenance of the Akebia Patent Rights and Joint Patent Rights in the Territory (the “IP Budget”).  For
clarity, the IP Budget may include a range of estimated costs and expenses expected to be incurred by or on behalf of Akebia
in connection with such activities. Licensee agrees to reimburses the actual reasonable costs and expenses incurred by or on
behalf of Akebia in connection with the filing, prosecution, and maintenance of the Akebia Patent Rights in the Territory and
the Joint Patent Rights in the Territory based on documentation provided by Akebia to Licensee, to the extent consistent with
the aggregate amounts set forth in the IP Budget. Akebia may provide Licensee an updated version of the IP Budget from
time  to  time  as  may  be  required.  If  the  actual  costs  and  expenses  incurred  by  Akebia  in  connection  with  the  filing,
prosecution, and maintenance of the Akebia Patent Rights and Joint Patent Rights in the Territory exceed the last update of
the IP Budget communicated to Licensee, Licensee and Akebia shall discuss in good faith the additional costs and expenses
that Licensee will reimburse Akebia. Licensee will reimburse Akebia for all such costs and expenses as set forth under this
Section 6.2.3 (Assistance; Costs) no later than [**] of receipt of an invoice therefor from Akebia. If Licensee disagrees with
any costs or expenses for which Akebia seeks reimbursement for from Licensee in excess of the IP Budget, then the Parties
will  discuss  in  good  faith.  If  despite  such  good  faith  discussions  the  Parties  cannot  agree  on  whether  Licensee  should
reimburse  such  costs  and  expenses  actually  incurred  by  Akebia  in  excess  of  the  IP  Budget,  then  such  dispute  shall  be
resolved in accordance with Article 11 (Dispute Resolution; Governing Law).

6.2.4        Abandonment.  If  Akebia  decides  that  it  is  no  longer  interested  in  prosecuting  or  maintaining  a  particular  Akebia  Patent
Right or Joint Patent Right in any country in the Territory during the Term, then it will promptly provide written notice to
Licensee of this decision, and in any case in a timing that reasonably allows Licensee to meet the next

26

deadline related to the applicable Akebia Patent Right or Joint Patent Right. Licensee may, upon written notice to Akebia,
assume the prosecution and maintenance of such Akebia Patent Right or Joint Patent Right, as applicable, in such countries
in the Territory at its sole cost and expense. If Licensee assumes the prosecution and maintenance of an Akebia Patent Right
or a Joint Patent Right, then Akebia undertakes to reasonably assist Licensee with respect to the issuance, prosecution and
maintenance of such Akebia Patent Rights and Joint Patent Rights, without cost to Akebia, and to provide to Licensee the
necessary documents available to Akebia for Akebia Patent Right and Joint Patent Right filings by Licensee or on behalf of
Licensee.

6.3    Prosecution of Licensee Patent Rights.

6.3.1        Filing  of  Licensee  Patent  Rights.  Licensee  will  have  the  first  right  to  file  patent  applications  claiming  Licensee
Improvements.  If  Licensee  declines  to  file  such  applications,  then  Akebia  may  do  so,  but  regardless  of  which  Party  files
patent  applications  claiming  such  Licensee  Improvements,  Licensee  will  have  the  first  right,  but  not  the  obligation,  to
prosecute and maintain Licensee Patent Rights.

6.3.2    Status Updates. Licensee will provide notice to Akebia of, and the Parties will discuss, any significant actions to be taken

with respect to the Licensee Patent Rights.

6.3.3    Abandonment. If Licensee decides that it is no longer interested in maintaining or prosecuting a particular Licensee Patent
Right  during  the  Term,  then  it  will  promptly  provide  written  notice  to  Akebia  of  this  decision.  Akebia  may,  upon  written
notice to Licensee, assume the prosecution and maintenance of such Licensee Patent Right at its sole cost and expense. If
Akebia assumes the prosecution and maintenance of a Licensee Patent Right, then Licensee undertakes to reasonably assist
Akebia with respect to the issuance, prosecution and maintenance of such Licensee Patent Right, without cost to Licensee,
and to provide to Akebia the necessary documents available to Licensee for Licensee Patent Right filings by Akebia or on
behalf of Akebia.

6.4    Enforcement of Akebia Patent Rights, Joint Patent Rights, and Licensee Patent Rights in the Territory.

6.4.1        Notice  of  Infringement.  If  either  Party  becomes  aware  of  any  Third  Party  activity  in  the  Territory,  including  any
Development  activity  in  the  Territory  (whether  or  not  an  exemption  from  infringement  liability  for  such  Development
activity is available under Applicable Law), that infringes (or that is directed to the Development of a product that would
infringe) an Akebia Patent Right, a Joint Patent Right, or a Licensee Patent Right, then the Party becoming aware of such
activity will give prompt written notice to the other Party, and in any event no later than within [**] of becoming aware of
such infringement, regarding such alleged infringement.

6.4.2    Rights to Enforce Akebia Patent Rights and Joint Patent Rights outside the Territory. As between the Parties, Akebia
will have the first right, but not the obligation, to attempt to resolve a Third Party activity that infringes (or that is directed to
the  Development  of  a  product  that  would  infringe)  (a)  an  Akebia  Patent  Right  and  (b)  a  Joint  Patent  Right  outside  the
Territory, in either case ((a)-(b)), in its sole discretion, including the filing of an infringement suit to enforce the such Akebia
Patent Rights or Joint Patent Rights (as applicable) using counsel of its own choice. Akebia will keep Licensee reasonably
informed regarding the status of any substantive meetings, hearings, or other proceedings related to such infringement suit
(to the extent relevant, together with its own counsel, at Licensee’s sole cost and expense). Akebia will provide to Licensee,
and  the  Parties  will  review  and  discuss,  a  budget  of  the  costs  and  expenses  to  be  incurred  by  or  on  behalf  of  Akebia  in
connection with any such action to abate such infringement, and Licensee will be responsible for [**] costs and expenses
incurred by or on behalf or Akebia in connection with any such action and abate such infringement. Licensee will reimburse
Akebia for [**] such costs and expenses related to any such action to abate

27

such infringement of the Akebia Patent Rights or the Joint Patent Rights outside the Territory no later than [**] of receipt of
an invoice therefor from Akebia. If Akebia fails to initiate a suit or take other action to terminate such alleged infringement
within  [**]  after  the  notice  provided  under  Section  6.4.1  (Notice  of  Infringement)  and  does  not  provide  Licensee
commercially reasonable reasons why such suit has not been initiated or other action has not been taken within such [**]
period, then Licensee will have the second right, but not the obligation, to attempt to resolve such Third Party activity in the
Territory by commercially appropriate steps at its own expense, including the filing of an infringement suit to enforce the
Akebia Patent Rights using counsel of its own choice.

6.4.3    Rights to Enforce Licensee Patent Rights and Joint Patent Rights in the Territory. As between the Parties, Licensee will
have the first right, but not the obligation, to attempt to resolve a Third Party activity in the Territory that infringes (or that is
directed to the Development of a product that would infringe) one or more Licensee Patent Rights or Joint Patent Rights in
the Territory by commercially appropriate steps at its own expense, including the filing of an infringement suit to enforce one
or more Licensee Patent Rights or Joint Patent Rights (as applicable) using counsel of its own choice. Licensee will keep
Akebia  reasonably  informed  with  respect  to  any  substantive  meetings,  hearings,  or  other  proceedings  related  to  such
infringement suit (to the extent relevant, together with its own counsel, at Akebia’s own cost and expense). Licensee will be
responsible for [**]% of the costs incurred with respect to such actions. If Licensee fails to initiate a suit or take other action
to terminate any such alleged infringement by a product that competes with the Licensed Product in the Territory within [**]
after the notice provided under Section 6.4.1 (Notice of Infringement), then Akebia will have the second right, but not the
obligation,  to  attempt  to  resolve  such  Third  Party  activity  in  the  Territory  at  its  own  expense,  including  the  filing  of  an
infringement suit to enforce the applicable Licensee Patent Rights or the Joint Patent Rights using counsel of its own choice.

6.4.4    Allocation of Recoveries in the Territory. Any amounts recovered by a Party as a result of an action pursuant to this Section
6.4  (Enforcement  of  Akebia  Patent  Rights,  Joint  Patent  Rights,  and  Licensee  Patent  Rights  in  the  Territory),  whether  by
settlement  or  judgment,  will  be  allocated  as  follows:  (a)  first  each  Party  will  be  reimbursed  its  internal  costs  and  external
expenses,  including  internal  costs  of  FTEs,  incurred  in  conducting,  or  cooperating  with,  such  action,  and  if  amounts
recovered  are  insufficient  to  reimburse  all  such  internal  costs  and  external  expenses  incurred  by  both  Parties,  then  such
recovered amounts will be shared pro-rata in proportion to the relative amount of such internal costs and external expenses
incurred by each Party; and (b) second, the balance of such recovered amounts will be retained by the Party bringing such
action.

6.4.5    Cooperation; Procedures. In any event, at the request of the Party bringing an infringement action under this Section 6.4
(Enforcement of Akebia Patent Rights, Joint Patent Rights, and Licensee Patent Rights in the Territory) and at its own cost
and expense, the other Party will provide reasonable assistance and cooperation in any such action (including entering into a
common interest agreement if reasonably deemed necessary by any Party) and agrees to be joined as a party to the suit if
necessary for the initiating Party to bring or continue an infringement action hereunder. In addition, the Party bringing an
infringement action under this Section 6.4 (Enforcement of Akebia Patent Rights, Joint Patent Rights, and Licensee Patent
Rights in the Territory) will provide the other Party with copies of all pleadings and other documents filed with the court and
will consider reasonable input from the other Party during the course of the action. Neither Party may settle any action or
proceeding brought under this Section 6.4 (Enforcement of Akebia Patent Rights, Joint Patent Rights, and Licensee Patent
Rights in the Territory) or knowingly take any other action in the course thereof, in a manner that materially adversely affects
the other Party’s interest in the Akebia Patent Rights or Joint Patent Rights in the Territory, in each case, without the written
consent  of  such  other  Party.  Each  Party  will  have  the  right  to  be  represented  by  counsel  of  its  own  selection  at  its  own
expense in any suit or other action instituted by the other Party pursuant to this

28

Section  6.4  (Enforcement  of  Akebia  Patent  Rights,  Joint  Patent  Rights,  and  Licensee  Patent  Rights  in  the  Territory).  In
addition, the Parties will reasonably assist each other and cooperate in any such investigation, pre-litigation preparation, or
litigation to ensure that there is an aligned global litigation and enforcement strategy.

6.5    Defense Against a Third Party Challenge to Akebia Patent Rights and Joint Patent Rights outside the Territory.

6.5.1        Rights  to  Defend.  If  a  Third  Party  initiates  a  challenge  to  the  validity,  scope,  or  enforceability  of,  or  any  opposition
proceeding  against,  any  (a)  Akebia  Patent  Right  (inside  the  Territory),  or  (b)  Joint  Patent  Right  (outside  the  Territory)
(“Akebia Defense Action”), then in either case ((a) – (b)) Akebia will have the first right, but not the obligation, to defend
against any such claim using the counsel of its own choosing; provided that Akebia will keep Licensee reasonably informed
regarding any such claim. Licensee will provide to Akebia all assistance reasonably requested by Akebia in connection with
any such Akebia Defense Action, including, when mandatory under Applicable Laws, required to establish standing or for
recovering damages, or requested by the applicable jurisdiction, the participation of Licensee in the defense action as a party.
When participation of Licensee in the defense action is not mandatory under Applicable Laws, required to establish standing
or  for  recovering  damages,  or  requested  by  the  applicable  jurisdiction,  Licensee  may  decide,  at  its  own  discretion,  to
participate to the defense action as a party. Akebia will have sole control of any negotiations for settlement or compromise of
all  Akebia  Defense  Actions.  If  Akebia  notifies  Licensee  that  it  does  not  wish  to  exercise  its  right  to  defend  an  Akebia
Defense Action solely with regards to a challenge or opposition proceeding against a Joint Patent Right outside the Territory,
then  Akebia  shall  notify  Licensee  in  writing  of  such  intent  and  within  [**]  of  Licensee’s  receipt  of  such  notice,  Licensee
shall have the second right, at its own cost and expense, to defend against any such Akebia Defense Action by counsel of its
own choice. In this event, Akebia shall provide to Licensee all reasonable cooperation, solely to the extent required to allow
Licensee to defend such Akebia Defense Action, and Licensee will, subject to Section 9.3 (Indemnification Procedure), have
sole control of any negotiations for settlement or compromise of such Akebia Defense Action.

6.5.2        Control  and  Cost.  With  regard  to  any  Akebia  Defense  Action,  Akebia  will  be  responsible  for  controlling  such  Akebia
Defense  Action  using  the  counsel  of  its  own  choosing,  including  the  right  to  control  the  strategy,  any  appeals,  and  other
material  factors  related  to  such  Akebia  Defense  Action.  In  addition,  the  Parties  will  reasonably  assist  each  other  and
cooperate  and  share  information  with  respect  to  such  Akebia  Defense  Actions,  including  any  appeals  thereof.  For  Akebia
Defense Actions initiated (a) prior to the Effective Date or (b) on or after the Effective Date related to a Joint Patent Right
outside the Territory (an “Akebia Cost Defense Action”), Akebia will be responsible for [**]% of out-of-pocket costs and
fees,  including  attorneys’  fees,  expert  fees,  court  fees,  and  translation  costs,  incurred  by  Akebia  in  connection  with  any
Akebia  Cost  Defense  Action,  including  any  appeals  related  to  such  Akebia  Cost  Defense  Action.  Akebia  will  provide  to
Licensee, and the Parties will review and discuss, a budget of the costs and expenses to be incurred by or on behalf of Akebia
in connection with any Akebia Defense Action in the Territory initiated on or after the Effective Date, and Licensee will be
responsible for [**] costs and expenses, including attorneys’ fees, expert fees, court fees, and translation costs, incurred by
either Party in connection with any Akebia Defense Action related to an Akebia Patent Right initiated on or after the

29

Effective Date (a “Licensee Cost Defense Action”), including any appeals related to such Licensee Cost Defense Action.
Licensee will reimburse Akebia for [**] costs and expenses related to any such Licensee Cost Defense Action initiated on or
after the Effective Date no later than [**] of receipt of an invoice therefor from Akebia.

6.6    Defense Against a Third Party Challenge to Joint Patent Rights in the Territory and Licensee Patent Rights.

6.6.1    Rights to Defend. If a Third Party initiates a challenge to the validity, scope, or enforceability of any Joint Patent Right in the
Territory or any Licensee Patent Right, or an opposition proceeding against any Joint Patent Rights in the Territory or any
Licensee Patent Rights (“Licensee Defense Action”), then Licensee will have the first right, but not the obligation, to defend
against any such claim using the counsel of its own choosing; provided that Licensee will keep Akebia reasonably informed
regarding  any  such  claim.  Akebia  will  provide  to  Licensee  all  assistance  reasonably  requested  by  Licensee  in  connection
with any such Licensee Defense Action. Licensee will have sole control of any negotiations for settlement or compromise of
all Licensee Defense Actions. If  Licensee  notifies  Akebia  that  it  does  not  wish  to  exercise  its  right  to  defend  an  Licensee
Defense Action solely with regards to a challenge or opposition proceeding against a Joint Patent Right inside the Territory,
then Licensee shall notify Akebia in writing of such intent and within [**] of Akebia’s receipt of such notice, Akebia shall
have the second right, at its own cost and expense, to defend against any such Licensee Defense Action by counsel of its own
choice.  In  this  event,  Licensee  shall  provide  to  Akebia  all  reasonable  cooperation,  solely  to  the  extent  required  to  allow
Akebia to defend such Licensee Defense Action, and Akebia will, subject to Section 9.3 (Indemnification Procedure), have
sole control of any negotiations for settlement or compromise of such Licensee Defense Action.

6.6.2    Control and Cost. With regard to any Licensee Defense Action, Licensee will be responsible for controlling such Licensee
Defense  Action  using  the  counsel  of  its  own  choosing,  including  the  right  to  control  the  strategy,  any  appeals,  and  other
material  factors  related  to  such  Licensee  Defense  Action.  In  addition,  the  Parties  will  reasonably  assist  each  other  and
cooperate and share information with respect to such Licensee Defense Actions, including any appeals thereof. Licensee will
be responsible for [**]% of out-of-pocket costs and fees, including attorneys’ fees, expert fees, court fees, and translation
costs, incurred by License in connection with any Licensee Defense Action, including any appeals related to such Licensee
Defense Action.

6.7    Defense of Third Party Infringement Claims; Third Party IP.

6.7.1    Infringement Claim. If a Third Party asserts that a Patent Right Controlled by it is or will be infringed by a Party’s activities
in the Territory under this Agreement (“Infringement Claim”) or a Party becomes aware of a Patent Right that might form
the basis for an Infringement Claim, then the Party first obtaining knowledge of such Infringement Claim or such potential
Infringement Claim will immediately provide the other Party with written notice thereof and the related facts in reasonable
detail.  The  Parties  will  discuss  whether  to  use  commercially  appropriate  steps  to  avoid  infringement  of  such  Third  Party
Patent Rights or other right controlled by such Third Party in the Territory. Akebia will make the final decision in its sole
discretion as to how to address such Infringement Claim or potential Infringement Claim, including whether it will seek a
license  from  such  Third  Party  pursuant  to  Section  6.7.3  (Responsibility  for  Third  Party  Licenses)  or  take  an  action  to
challenge such Third Party Patent Rights or other right controlled by such Third Party in the Territory; provided, however,
that  Akebia  will  consult  with  and  reasonably  consider  Licensee’s  views  regarding  any  such  action.  Akebia  will  provide
updates to Licensee on a regular basis and reasonably discuss and consult with Licensee, upon Licensee’s request, regarding
strategies in the Territory regarding any Third Party Patent Rights.

30

6.7.2        Responsibility  to  Defend.  If,  during  the  Term  of  this  Agreement,  a  Third  Party  asserts  that  a  Patent  Right  or  other  right
controlled by such Third Party is infringed or will be infringed in the Territory by the exercise of the licenses granted under
Article 2 (License Grants), then, subject to Section 6.7.4 (Challenge to Certain Third Party Patents), Akebia will have the
sole right to defend against any such claim using the counsel of its own choosing; provided that Akebia will keep Licensee
reasonably  informed  regarding  any  such  claim.  For  such  proceedings  initiated  prior  to  the  Effective  Date,  Akebia  will  be
responsible for [**]% of out-of-pocket costs and fees, including attorneys’ fees, expert fees, court fees, and translation costs,
incurred by Akebia in connection with any such proceeding, including any appeals related to such proceeding. Akebia will
provide  to  Licensee,  and  the  Parties  will  review  and  discuss,  a  budget  of  the  costs  and  expenses  to  be  incurred  by  or  on
behalf  of  Akebia  in  connection  with  any  such  proceeding  initiated  on  or  after  the  Effective  Date,  and  Licensee  will  be
responsible for [**] such costs and expenses, including attorneys’ fees, expert fees, court fees, and translation costs, incurred
by either Party in connection with any such proceeding initiated on or after the Effective Date, including any appeals related
to such Akebia Defense Action. Licensee will reimburse Akebia for [**] costs and expenses related to any such proceeding
initiated on or after the Effective Date no later than [**] of receipt of an invoice therefor from Akebia. Akebia will not settle
such  claim  in  a  manner  that  materially  adversely  affects  Licensee’s  interests  and  in  a  manner  that  is  disproportionate  to
Akebia’s  interests,  without  the  written  consent  of  Licensee.  In  addition,  the  Parties  will  reasonably  assist  each  other  and
cooperate and share information with respect to such claim.

6.7.3        Responsibility  for  Third  Party  Licenses.  At  any  time  during  the  Term,  if  either  Party  believes  that  it  is  necessary  or
advisable  to  seek  to  acquire  or  obtain  a  license  under  any  Patent  Rights  owned  or  controlled  by  a  Third  Party  in  order  to
avoid infringement thereof by the exercise of the licenses granted under Article 2 (License Grants), whether or not there has
been the institution of any infringement claim, then the Parties will discuss whether to acquire or obtain a license under such
Patent  Rights  in  the  Territory.  Akebia  will  have  the  sole  right,  but  not  the  obligation,  to  negotiate  and  acquire  or  obtain  a
license under such Patent Rights from such Third Party; provided, however,  that  Akebia  will  consult  with  and  reasonably
consider Licensee’s views regarding any such decision to acquire or obtain a license under such Patent Rights and regarding
the terms of such license to the extent pertaining to the Territory. If Akebia is not able to so acquire or obtain a license under
any  such  Patent  Rights  owned  or  controlled  by  such  a  Third  Party,  then  the  Parties  will  in  good  faith  discuss  at  the  JSC
modifications  to  the  Licensed  Product  to  avoid  infringement  of  such  Patent  Rights.  If  Akebia  does  so  acquire  or  obtain  a
license under any such Patent rights and the applicable acquisition or license agreement relates solely to the Development,
Manufacture,  Commercialization,  or  other  Exploitation  of  the  Licensed  Product  in  the  Territory,  then  Akebia  will  be
responsible for [**]% and Licensee will be responsible for [**]%, in each case, of all amounts payable to such Third Party
assignor,  licensor,  or  grantor  of  rights  pursuant  to  such  agreement.  If  such  acquisition  or  license  agreement  relates  to  the
Development, Manufacture, Commercialization, or other Exploitation of the Licensed Product in countries both inside and
outside of the Territory, then (a) Akebia will be responsible for [**]% and Licensee will be responsible for [**]%, in each
case,  of  any  such  payments  thereunder  that  arise  out  of  the  Development,  Manufacture,  Commercialization,  or  other
Exploitation of the Licensed Product in the Territory (e.g., any milestone payments for achievement of milestone events in
the Territory or royalties on net sales of the Licensed Product in the Territory), (b) Licensee will be responsible for [**]% of
any  such  payments  thereunder  that  are  not  directly  attributable  to  the  Development,  Manufacture,  Commercialization,  or
other  Exploitation  of  the  Licensed  Product  in  the  Territory  or  outside  of  the  Territory  (e.g.,  an  upfront  payment),  and  (c)
Akebia  will  be  responsible  for  [**]%  of  any  such  payments  thereunder  that  arise  out  of  the  Development,  Manufacture,
Commercialization, or other Exploitation of the Licensed Product in countries outside of the Territory (e.g., any milestone
payments  for  achievement  of  any  milestone  events  in  a  country  outside  of  the  Territory  or  royalties  on  net  sales  of  the
Licensed Product outside of the Territory). Licensee will reimburse Akebia for Licensee’s share of such payments no later
than [**]

31

of receipt of an invoice therefor from Akebia. This Section 6.7 (Defense of Third Party Infringement Claims; Third Party IP)
will not be interpreted as placing on either Party a duty of inquiry regarding Third Party intellectual property rights. Each
Party will keep the other Party informed of the status of any Third Party claim of infringement.

6.7.4    Challenge to Certain Third Party Patent Rights.

(a)

(b)

Initiation. The Parties, together with each Party’s patent counsel (in each Party’s discretion), will discuss whether or
not to initiate an invalidity action (including oppositions), either in the applicable patent office or court, challenging
any Third Party Patent Rights that claim the Licensed Product (each, on a Third Party Patent-by-Third Party Patent
basis,  an  “Invalidation  Proceeding”),  and  the  strategy  and  timeline  for  any  Invalidation  Proceeding  that  Akebia
pursues  in  accordance  with  this  Section  6.7.4  (Challenge  to  Certain  Third  Party  Patent  Rights).  Immediately
following such discussion, Akebia, in consultation and discussion with Licensee, will begin preparing the documents
for filing any such Invalidation Proceedings that the Parties have agreed to initiate pursuant to the previous sentence,
and the Parties will attempt to agree (including, if necessary, following escalation to the Parties’ Executive Officers)
on the timeline for filing and pursuing any such Invalidation Proceedings. Subject to the remainder of this Section
6.7.4(a)  (Initiation),  Akebia  will  make  the  final  decision  in  its  sole  discretion  as  to  whether  to  initiate  any
Invalidation Proceeding. If the Parties are unable to agree on whether to initiate any Invalidation Proceeding, or on
the  timeline  for  pursuing  any  such  Invalidation  Proceeding,  then,  to  the  extent  required  or  advisable  to  prevent  a
Third Party from interfering with or obstructing Commercialization of the Licensed Product, Licensee will have the
right  to  require  Akebia  to  initiate  and  pursue  Invalidation  Proceedings;  provided  that  prior  to  exercising  the
foregoing right to cause Akebia to initiate any such Invalidation Proceeding in such country, Licensee will consider
in  good  faith  any  comments  by  Akebia  regarding  the  merits  of  initiating  such  proceeding  in  such  country  and,  if
initiated, the best type of proceeding to pursue in each such country. Akebia will control the strategy, venue, type of
proceeding,  selection  of  counsel,  and,  subject  to  the  previous  sentence,  the  timeline,  in  each  case,  for  filing  and
pursuing  all  such  Invalidation  Proceedings  in  accordance  with  Section  6.7.4(b)  (Control  and  Costs);  provided that
Akebia will consult with and reasonably consider in good faith Licensee’s (and Licensee’s outside patent counsel’s)
views regarding any such Invalidation Proceeding, including the strategy and timeline for initiating and pursuing any
Invalidation Proceeding and the best type of proceeding to pursue in each such country.

Control  and  Costs.  With  regard  to  any  Invalidation  Proceeding,  Akebia  will  be  responsible  for  preparing,  filing,
pursuing, and controlling such Invalidation Proceeding and the counsel of its own choosing, including the right to
control  the  strategy,  choice  of  venue,  type  of  proceeding,  timing  (subject  to  Section  6.7.4(a)  (Initiation)),  any
appeals, and other material factors related to such Invalidation Proceeding. In addition, the Parties will reasonably
assist each other and cooperate and share information with respect to such Invalidation Proceedings, including any
appeals  thereof.  For  Invalidation  Proceedings  initiated  prior  to  the  Effective  Date,  Akebia  will  be  responsible  for
[**]%  of  out-of-pocket  costs  and  fees,  including  attorneys’  fees,  expert  fees,  court  fees,  and  translation  costs,
incurred  by  Akebia  in  connection  with  any  Invalidation  Proceeding,  including  any  appeals  related  to  such
Invalidation Proceeding. Akebia will provide to Licensee, and the Parties will review and discuss, a budget of the
costs and expenses to be incurred by or on behalf of Akebia in connection with any Invalidation Proceeding initiated
on or after the Effective Date, and Licensee will be responsible for [**] costs and expenses incurred by or on behalf
of  Akebia  in  connection  with  any  Invalidation  Proceeding  initiated  on  or  after  the  Effective  Date,  including
attorneys’ fees, expert fees, court fees, and translation costs,

32

incurred  by  either  Party  in  connection  with  any  Invalidation  Proceeding  initiated  on  or  after  the  Effective  Date,
including  any  appeals  related  to  such  Invalidation  Proceeding.  Licensee  will  reimburse  Akebia  for  [**]  costs  and
expenses  related  to  any  such  Invalidation  Proceeding  initiated  on  or  after  the  Effective  Date  no  later  than  [**]  of
receipt of an invoice therefor from Akebia.

(c)

Cooperation.  Akebia  will  keep  Licensee  reasonably  informed  regarding  substantive  meetings,  hearings,  or  other
proceedings related to such Invalidation Proceeding (to the extent relevant, together with its own counsel, at its own
expense).

6.8        Patent  Term  Extensions.  Akebia  will  be  solely  responsible  for  making  all  decisions  regarding  patent  term  extensions,  including
supplementary  protection  certificates  and  any  other  extensions  that  are  now  or  become  available  in  the  future,  with  respect  to  the
Licensed Product; provided that Akebia will consult with Licensee with respect to such decisions and will consider the comments
and concerns of Licensee in good faith. Licensee will reimburse Akebia for all costs and expenses incurred by Akebia pursuant to
this Section 6.8 (Patent Term Extensions) no later than [**] of receipt of an invoice therefor from Akebia.

6.9        Unified  Patent  Court.  In  the  event  that  the  Unified  Patent  Court  Agreement  enters  into  force  during  the  Term  of  this  Agreement,
Akebia will be solely responsible for making all decisions regarding Patent Rights, including decisions regarding the opting-out or
opting-in of existing European Patent Rights into the jurisdiction of the Unified Patent Court or the registration of European Patents
with Unitary Effect; provided that Akebia will consult with Licensee with respect to such decisions and will consider the comments
and concerns of Licensee in good faith.

7.

7.1.

7.2.

CONFIDENTIALITY

Definition.  “Confidential  Information”  means  the  terms  and  provisions  of  this  Agreement  and  other  Know-How,  inventions,
materials, and other non-public or proprietary information and data of a financial, commercial, or technical nature that a Party (the
“Disclosing Party”) or any of its Affiliates has supplied or otherwise made available to the other Party (the “Receiving Party”) or
its  Affiliates,  whether  in  writing  or  orally  and  whether  or  not  specifically  marked  or  designated  by  the  Disclosing  Party  as
confidential. All Akebia Know-How will be considered Akebia’s Confidential Information and Akebia will be the Disclosing Party
with  respect  thereto.  The  terms  of  this  Agreement  and  all  Licensee  Development  Data  will  each  be  considered  the  Confidential
Information of both Parties and both Parties will be the Receiving Party with respect thereto.

Obligations.  During  the  Term  of  this  Agreement  and  for  [**]  thereafter,  the  Receiving  Party  will  (a)  protect  all  Confidential
Information  of  the  Disclosing  Party  against  unauthorized  disclosure  to  Third  Parties  and  (b)  not  use  or  disclose  the  Confidential
Information  of  the  Disclosing  Party,  except  as  permitted  by  or  in  furtherance  of  exercising  rights  or  carrying  out  obligations
hereunder. The Receiving Party will treat all Confidential Information provided by the Disclosing Party with the same degree of care
as  the  Receiving  Party  uses  for  its  own  similar  information,  but  in  no  event  less  than  a  reasonable  degree  of  care.  The  Receiving
Party may disclose the Confidential Information to its Affiliates, and their respective directors, officers, employees, Subcontractors,
prospective  Sublicensees,  Sublicensees,  consultants,  attorneys,  accountants,  banks,  financial  or  legal  advisors,  lenders,  prospective
lenders,  financing  sources,  prospective  financing  sources,  prospective  acquirers,  investors  and  prospective  investors  (collectively,
“Representatives”) who have a need-to-know such information to carry out the activities and transactions or to exercise its rights
contemplated by this Agreement, provided that such Representatives are bound by obligations of confidentiality at least as restrictive
as those set forth in this Agreement. Each Party will promptly notify the other Party of any misuse or unauthorized disclosure of the
other Party’s Confidential Information.

7.3.

Exceptions to Confidentiality. The obligations under this Article 7 (Confidentiality) will not apply to any information to the extent
the Receiving Party can demonstrate by competent evidence that such information:

33

7.3.1.

is  (at  the  time  of  disclosure)  or  becomes  (after  the  time  of  disclosure)  known  to  the  public  or  part  of  the  public  domain
through no breach of this Agreement by the Receiving Party or any Representatives to whom it disclosed such information;

7.3.2. was rightfully known to, or was otherwise lawfully in the possession of, the Receiving Party prior to the time of disclosure

by the Disclosing Party;

7.3.3.

is  disclosed  to  the  Receiving  Party  on  a  non-confidential  basis  by  a  Third  Party  who  is  entitled  to  disclose  it  without
breaching any confidentiality obligation to the Disclosing Party; or

7.3.4.

is independently developed by or on behalf of the Receiving Party or any of its Affiliates, as evidenced by its written records,
without use or access to the Confidential Information.

7.4.

Permitted Disclosures.

7.4.1. Compliance  with  Law.  The  restrictions  set  forth  in  this  Article  7  (Confidentiality)  will  not  apply  to  any  Confidential
Information that the Receiving Party is required to disclose under Applicable Laws a valid court order or other governmental
order  or  to  enforce  any  Akebia  Patent  Rights  under  Article  6  (Intellectual  Property  Rights),  provided  that  the  Receiving
Party: (a) provides the Disclosing Party with prompt notice of such disclosure requirement if legally permitted; (b) affords
the  Disclosing  Party,  to  the  extent  permitted,  an  opportunity  to  oppose  or  limit,  or  secure  confidential  treatment  for,  such
required  disclosure;  and  (c)  if  the  Disclosing  Party  is  unsuccessful  in  its  efforts  pursuant  to  clause  (b),  discloses  only  that
portion of the Confidential Information that the Receiving Party is legally required to disclose as advised by the Receiving
Party’s legal counsel.

7.4.2. SEC Filings and Other Disclosures. Either Party may disclose the terms of this Agreement only to the extent required, in
the reasonable opinion of such Party or such Party’s outside legal counsel, to comply with Applicable Law, regulation, or
legal  process  or  by  applicable  stock  exchange  rule.  If  a  Party  must  disclose  this  Agreement  or  any  of  the  terms  hereof  in
accordance with the preceding sentence, then such Party agrees, at its own cost and expense, to seek confidential treatment of
portions  of  this  Agreement  or  such  terms  as  may  be  reasonably  requested  by  the  other  Party,  and  to  cause  all  Persons  to
whom any terms of this Agreement are disclosed to be bound by written obligations of confidentiality and non-use no less
stringent than the confidentiality terms of this Agreement.

7.4.3. Disclosure of Agreement Terms. Notwithstanding the restrictions set forth in this Article 7 (Confidentiality), a Party may,
without the prior consent of the other Party, disclose the terms and provisions of this Agreement to any actual or bona fide
potential  investors,  acquirors,  (sub)licensees,  lenders,  and  other  financial  or  commercial  partners  (including  in  connection
with any royalty factoring transaction), and their respective attorneys, accountants, banks, investors, and advisors, solely for
the  purpose  of  evaluating  or  carrying  out  an  actual  or  potential  investment,  acquisition,  (sub)license,  debt  transaction,  or
collaboration; provided that such Third Party is bound by written obligations of confidentiality at least as stringent as those
set  forth  in  this  Agreement  or  otherwise  customary  for  such  type  and  scope  of  disclosure  and  that  any  such  disclosure  is
limited to the maximum extent practicable for the particular context in which it is being disclosed.

7.4.4. Other Permitted Disclosures. In addition, and notwithstanding the restrictions set forth in this Article 7 (Confidentiality), a
Party may, without the prior consent of the other Party, disclose the other Party’s Confidential Information (including this
Agreement and the terms hereof) to the extent such disclosure is reasonably necessary in the following circumstances: (a) the
prosecution, enforcement, and defense of Akebia Patent Rights, Joint Patent Rights, or Licensee Patent Rights, in each case,
as contemplated by this Agreement, (b) to prosecute or defend litigation, so long as there is [**] prior written

34

7.5.

7.6.

7.7.

8.

8.1.

notice given by the Receiving Party before filing, (c) to present, disclose, and discuss general information about the existence
of the Agreement and the general progress of the Licensed Products at investor press conferences or similar events; and (d)
disclosure pursuant to Section 7.6 (Public Announcements); provided that any Confidential Information disclosed pursuant to
this Section 7.4.4 (Other Permitted Disclosures) is be limited to that information that is legally required or necessary for the
particular in which it is being disclosed.

Right to Injunctive Relief. Notwithstanding any provision to the contrary set forth in this Agreement, the Parties each stipulate and
agree  that  (a)  the  Confidential  Information  includes  highly  sensitive  trade  secret  information,  (b)  a  breach  of  this  Article  7
(Confidentiality) by a Party with respect to such information may cause irrevocable harm for which monetary damages would not
provide  a  sufficient  remedy,  and  (c)  in  such  case  of  a  breach  of  this  Article  7  (Confidentiality),  the  non-breaching  Party  will  be
entitled to equitable relief, including a temporary restraining order, preliminary injunction, or permanent injunction from any court of
competent jurisdiction.

Public Announcements. Except as required to comply with Applicable Law, for appropriate market disclosure, or for disclosures
that are consistent with information disclosed in prior releases properly made hereunder, neither Party will originate any publicity,
news  release,  or  public  announcements,  written  or  oral,  whether  to  the  public  or  press,  stockholders,  or  otherwise,  relating  to  the
terms  of  this  Agreement  without  the  prior  written  consent  of  the  other  Party,  not  to  be  unreasonably  withheld.  Any  such  release,
publicity, or announcement made previously in accordance with this Section 7.6 (Public Announcements) may be re-issued; provided
that the information contained therein remains current, correct, and accurate at the time of re-issue.

Use of Marks. Subject to the rights granted to Licensee pursuant to Section 4.10.3 (Trademark License), neither Party (nor any of its
Affiliates or agents) will use the Marks of the other Party or its Affiliates in any press release, publication, or other form of public
promotional disclosure without the prior written consent of the other Party in each instance.

REPRESENTATIONS, WARRANTIES, AND COVENANTS

Representations and Warranties by Each Party. Each Party represents and warrants to the other Party as of the Effective Date as
follows:

8.1.1.

It is a corporation duly organized, validly existing, and in good standing under the laws of its jurisdiction of formation.

8.1.2.

It has full corporate power and authority to execute, deliver, and perform under this Agreement, and has taken all corporate
action  required  by  Applicable  Laws  and  its  organizational  documents  to  authorize  the  execution  and  delivery  of  this
Agreement and the consummation of the transactions contemplated by this Agreement.

8.1.3. This Agreement constitutes a valid and binding agreement enforceable against it in accordance with its terms.

8.1.4. All consents, approvals and authorizations from all Governmental Authorities or other Third Parties required to be obtained

by such Party in connection with this Agreement have been obtained.

8.1.5. The execution and delivery of this Agreement and all other instruments and documents required to be executed pursuant to
this Agreement, and the consummation of the transactions contemplated hereby do not and will not: (a) conflict with or result
in a breach of or a default under any provision of its organizational documents; (b) result in a

35

breach  of  or  default  under  any  agreement  to  which  it  is  a  party  that  would  impair  the  performance  of  its  obligations
hereunder; or (c) violate any Applicable Laws.

8.2.

Representations  and  Warranties  by  Akebia.  Except  as  set  forth  in  the  Disclosure  Schedule  attached  hereto  as  Schedule  8.2
(Disclosure Schedule), Akebia represents and warrants to Licensee as of the Effective Date as follows:

8.2.1. Akebia  Controls  the  Akebia  Patent  Rights  and  the  Akebia  Know-How,  and  has  the  rights  to  grant  the  license  granted  in

Section 2.1 (License Grants to Licensee).

8.2.2. Schedule  1.12  (Akebia  Patent  Rights)  includes  all  Patent  Rights  Controlled  by  Akebia  that  are  necessary  to  Exploit  the

Licensed Product in the Field in the Territory.

8.2.3. To Akebia’s Knowledge, all Akebia Patents Rights existing as of the Effective Date are (i) being diligently prosecuted in the
respective patent offices in the Territory in accordance with Applicable Law, and (ii) have been filed and maintained and all
applicable fees have been paid on or before the due date for such payments;

8.2.4. Akebia has not previously assigned, transferred, conveyed or otherwise encumbered its right, title and interest in and to the
Licensed  Product  in  a  manner  that  could  or  would  prevent  Akebia  from  granting  the  rights  to  Licensee  pursuant  to  this
Agreement;

8.2.5. Akebia  has  not  received  any  written  notice  from  a  Third  Party  and,  to  Akebia’s  Knowledge,  there  is  no  claim  pending  or
threatened  by  a  Third  Party  alleging  that  the  Exploitation  of  the  Licensed  Product  by  or  on  behalf  of  Akebia  in  the  Field
within the Territory has infringed, misappropriated, or otherwise violated the Intellectual Property Rights of a Third Party,
and  to  Akebia’s  Knowledge,  such  Exploitation  has  not  infringed,  misappropriated,  or  otherwise  violated  the  Intellectual
Property Rights of a Third Party.

8.2.6. To the extent permitted under the [**] Agreement, Akebia has provided to Licensee a true and complete copy of the [**]

Agreement.

8.2.7.

In  performing  under  this  Agreement,  Akebia  and  its  Affiliates  will  comply  with  the  US  anti-bribery  laws  applicable  to
Akebia. Akebia has not and will not directly or indirectly offer or pay, or authorize such offer or payment of, any money, or
transfer  anything  of  value,  to  improperly  seek  to  influence  any:  (a)  any  elected  or  appointed  government  official  (e.g.,  a
member of a ministry of health); (b) any employee or person acting for or on behalf of a Governmental Authority; (c) any
political party officer or employee acting for or on behalf of a political party or candidate for public office; (d) an employee
or  person  acting  for  or  on  behalf  of  a  public  international  organization;  or  (e)  any  person  otherwise  categorized  as  a
government official under local law.

8.2.8. As of the Effective Date, neither it nor any of its Affiliates has been debarred or is subject to debarment, and neither it nor
any of its Affiliates will use in any capacity, in connection with its activities under this Agreement, any person who has been
debarred pursuant to Section 306 of the FFDCA, or who is the subject of a conviction described in such Section 306, or who
is  subject  to  any  similar  sanction  of  any  Governmental  Authority  in  the  Territory.  Akebia will inform Licensee in writing
promptly if it or any such Person who is performing services hereunder is debarred or is the subject of a conviction described
in  such  Section  306  or  if  any  action,  suit,  claim,  investigation,  or  legal  or  administrative  proceeding  is  pending,  or  is
threatened, relating to the debarment or conviction of it or any such Person performing services hereunder.

8.3.

Covenants of Licensee. Licensee covenants to Akebia as follows:

8.3.1. Licensee will perform, or will ensure that each of its Affiliates, permitted Sublicensees (as applicable), and Subcontractors
perform, all activities under this Agreement in a professional and ethical business manner and in compliance with Applicable
Law,

36

8.3.2.

8.3.3.

applicable Professional Requirements, the Approved Labeling, and the Commercialization Plan, including, as applicable, the
European  Data  Protection  Directive  95/46/EC,  the  European  General  Data  Protection  Regulation  (Regulation  (EU)
2016/679), and any other applicable national data protection legislation.

In performing under this Agreement, it and its Affiliates will comply with all applicable anti-corruption laws, including the
Foreign Corrupt Practices Act of 1977 and the Bribery Act 2010, as amended from time-to-time; the anti-corruption laws of
the Territory, and all laws enacted to implement the Organization for Economic Co-operation and Development Convention
on Combating Bribery of Foreign Officials in International Business Transactions.

It  has  not  and  will  not  directly  or  indirectly  offer  or  pay,  or  authorize  such  offer  or  payment  of,  any  money,  or  transfer
anything of value, to improperly seek to influence any: (a) any elected or appointed government official (e.g., a member of a
ministry of health); (b) any employee or person acting for or on behalf of a Governmental Authority; (c) any political party
officer,  employee,  or  person  acting  for  or  on  behalf  of  a  political  party  or  candidate  for  public  office;  (d)  an  employee  or
person acting for or on behalf of a public international organization; or (e) any person otherwise categorized as a government
official under local law.

8.3.4. As of the Effective Date, neither it nor any of its Affiliates has been debarred or is subject to debarment, and neither it nor
any of its Affiliates will use in any capacity, in connection with its activities under this Agreement, any person who has been
debarred pursuant to Section 306 of the FFDCA, or who is the subject of a conviction described in such Section 306, or who
is  subject  to  any  similar  sanction  of  any  Governmental  Authority  in  the  Territory.  Licensee will inform Akebia in writing
promptly if it or any such Person who is performing services hereunder is debarred or is the subject of a conviction described
in  such  Section  306  or  if  any  action,  suit,  claim,  investigation,  or  legal  or  administrative  proceeding  is  pending,  or  is
threatened, relating to the debarment or conviction of it or any such Person performing services hereunder.

8.3.5. Licensee will have responsibility for tracking and reporting payments or other transfers of value made directly or indirectly
to health care professionals or other persons and entities under the so-called federal “sunshine law” or Open Payments (42
U.S.C.  §1320a-7a)  and  analogous  state  laws  and  foreign  laws  in  the  Territory  in  connection  with  the  performance  of  this
Agreement in accordance with their respective compliance policies.

Covenant of Akebia. Akebia will not amend the [**] Agreement in a way that adversely affects the rights granted to Licensee under
this Agreement or increases the amount of the Base Royalties without Licensee’s prior written consent.

No Other Warranties. EXCEPT AS EXPRESSLY STATED IN THIS ARTICLE 8 (REPRESENTATIONS, WARRANTIES, AND
COVENANTS),  NEITHER  PARTY  MAKES  ANY  REPRESENTATIONS  OR  EXTENDS  ANY  WARRANTIES  OR
CONDITIONS  OF  ANY  KIND,  EITHER  EXPRESS  OR  IMPLIED,  STATUTORY  OR  OTHERWISE,  INCLUDING
WARRANTIES  OF  TITLE,  NON-INFRINGEMENT,  VALIDITY,  ENFORCEABILITY,  MERCHANTABILITY,  OR  FITNESS
FOR  A  PARTICULAR  PURPOSE  WITH  RESPECT  TO  THE  LICENSED  PRODUCT  OR  THE  SUBJECT  MATTER  OF  THIS
AGREEMENT. ANY INFORMATION PROVIDED BY AKEBIA OR ITS AFFILIATES IS MADE AVAILABLE ON AN “AS IS”
BASIS WITHOUT WARRANTY WITH RESPECT TO COMPLETENESS, OR FITNESS FOR A PARTICULAR PURPOSE OR
ANY OTHER KIND OF WARRANTY WHETHER EXPRESS OR IMPLIED.

INDEMNIFICATION

Indemnification  by  Licensee.  Licensee  agrees  to  indemnify,  hold  harmless,  and  defend  Akebia  and  its  Affiliates,  and  their
respective officers, directors, employees, successors, and assigns, and

8.4.

8.5.

9.

9.1.

37

representatives (collectively, “Akebia Indemnitees”), from and against any Claims arising from or relating to: (a) the Development
of  the  Licensed  Product  in  the  Territory  by  or  on  behalf  of  Licensee,  or  its  Affiliates,  Subcontractors,  or  Sublicensees;  (b)  the
Manufacturing, Commercialization, or other Exploitation of the Licensed Product in the Territory by or on behalf of Licensee, or its
Affiliates,  Subcontractors,  or  Sublicensees,  including  the  content  of  any  promotional  materials  or  medical  materials;  (c)  the
negligence or wrongful intentional acts or omissions of Licensee, or its Affiliates, Subcontractors, or Sublicensees; (d) the breach by
Licensee or its Affiliates, Subcontractors, or Sublicensees of any obligation, representation, warranty, or covenant set forth in this
Agreement;  (e)  the  failure  to  comply  with  Applicable  Law  by  or  on  behalf  of  Licensee,  or  its  Affiliates,  Subcontractors,  or
Sublicensees; and (f) any claim of death or bodily injury resulting from the use of the Licensed Product sold in the Territory; except,
in each case ((a) – (f)), to the extent such Claims arise from or occur as a result of the breach by Akebia of this Agreement or the
negligence or willful misconduct on the part of any Akebia Indemnitee.

Indemnification by Akebia. Akebia agrees to indemnify, hold harmless, and defend Licensee and its Affiliates and their respective
officers, directors, employees, successors and assigns, and representatives (collectively, “Licensee Indemnitees”), from and against
any  Claims  arising  from  or  relating  to:  (a)  the  Manufacturing,  Commercialization,  or  other  Exploitation  of  the  Licensed  Product
outside the Territory by or on behalf of Akebia, or its Affiliates, Subcontractors, or Sublicensees (excluding Licensee), including the
content of any promotional materials or medical materials, (b) the negligence or wrongful intentional acts or omissions of Akebia or
its Affiliates, contractors, or licensees (other than Licensee); (c) the breach by Akebia or its Affiliates, contractors, or licensees (other
than Licensee) of any obligation, representation, warranty, obligation, or covenant set forth in this Agreement; or (d) the failure to
comply with Applicable Law by or on behalf of Akebia, or its Affiliates, contractors, or licensees (other than Licensee); except, in
each case ((a) – (d)), to the extent such Claims arise from or occur as a result of the breach by Licensee of this Agreement or the
negligence or willful misconduct on the part of any Licensee Indemnitee.

Indemnification Procedure. In connection with any Claim for which a Party (the “Indemnified Party”) seeks indemnification from
the other Party (the “Indemnifying Party”) pursuant to this Agreement, the Indemnified Party will: (a) give the Indemnifying Party
prompt written notice of the Claim; provided, however,  that  failure  to  provide  such  notice  will  not  relieve  the  Indemnifying  Party
from its liability or obligation hereunder, except to the extent of any material prejudice as a direct result of such failure; (b) cooperate
with the Indemnifying Party, at the Indemnifying Party’s expense, in connection with the defense and settlement of the Claim; and (c)
permit the Indemnifying Party to control the defense and settlement of the Claim. Akebia, in its capacity as the Indemnifying Party,
shall  not  settle  any  such  Claim  without  Licensee’s  prior  written  consent  (not  to  be  unreasonably  withheld),  if  such  settlement
materially adversely impacts Licensee’s rights or obligations. Licensee, in its capacity as the Indemnifying Party, shall not settle any
such Claim without Akebia’s prior written consent (not to be unreasonably withheld). Further, the Indemnified Party will have the
right  to  participate  (but  not  control)  and  be  represented  in  any  suit  or  action  by  advisory  counsel  of  its  selection  and  at  its  own
expense. Each notice provided pursuant to this Section 9.3 (Indemnification Procedure) will contain a description of the Claim and
the nature and amount of such Claim (to the extent that the nature and amount of such Claim is known at such time).

CONSEQUENTIAL DAMAGES WAIVER. NEITHER OF THE PARTIES WILL BE ENTITLED TO RECOVER FROM THE
OTHER PARTY ANY SPECIAL, INCIDENTAL, INDIRECT, CONSEQUENTIAL, OR PUNITIVE DAMAGES OR DAMAGES
FOR LOSS OF PROFIT OR LOST OPPORTUNITY IN CONNECTION WITH THIS AGREEMENT, ITS PERFORMANCE OR
LACK OF PERFORMANCE HEREUNDER, OR ANY LICENSE GRANTED HEREUNDER, EXCEPT TO THE EXTENT THE
DAMAGES  RESULT  FROM  A  PARTY’S  WILLFUL  MISCONDUCT  OR  INTENTIONAL  BREACH  OF  ITS  OBLIGATIONS
UNDER THIS AGREEMENT, A BREACH OF THE OBLIGATIONS OF A PARTY UNDER ARTICLE 7 (CONFIDENTIALITY),
INFRINGEMENT  OF  INTELLECTUAL  PROPERTY  RIGHTS  OWNED  OR  CONTROLLED  BY  THE  OTHER  PARTY,  AND
AMOUNTS

9.2.

9.3.

9.4.

38

REQUIRED  TO  BE  PAID  TO  A  THIRD  PARTY  AS  PART  OF  A  CLAIM  FOR  WHICH  A  PARTY  PROVIDES
INDEMNIFICATION UNDER ARTICLE 9 (INDEMNIFICATION).

9.5.

Insurance. Licensee will, at its own expense, obtain and maintain insurance with respect to the Development and Commercialization
of  the  Licensed  Product  under  this  Agreement  and  for  [**]  thereafter  in  such  amount  and  subject  to  such  deductibles  and  other
limitations as biopharmaceutical companies customarily maintain with respect to the research, development, and commercialization
of  similar  products  in  their  respective  territories.  Such  insurance  policy  will  name  Akebia  as  an  additional  insured  and  will  be
reasonably acceptable to Akebia. Licensee will provide a copy of such insurance policy to Akebia upon request.

10.

TERM; TERMINATION

10.1. Term. This Agreement will continue in full force and effect, unless otherwise terminated in accordance with this Article 10 (Term;
Termination), until the expiration of all applicable Royalty Terms with respect to the Licensed Product on a country-by-country-basis
in the Territory (the “Term”). On a country-by-country basis, upon the natural expiration of this Agreement as contemplated in this
Section 10.1 (Term), so long as at such time Licensee has paid to Akebia all amounts due under this Agreement and accrued prior to
such natural expiration of the Term in accordance with the terms hereof and is not at such time in material breach of any term of this
Agreement,  (a)  the  licenses  granted  to  Licensee  under  Section  2.1  (License  Grants  to  Licensee)  will  become  non-exclusive,
perpetual,  and  irrevocable  with  respect  to  such  country  in  the  Territory  and  (b)  if  Licensee  uses  any  Product  Mark  or  Akebia
Housemark  in  connection  with  the  Commercialization  of  the  Licensed  Product  in  any  country  in  the  Territory  following  the
expiration of the Term, then the licenses granted to Licensee under Section 4.10.3 (Trademark License) to use the Product Marks and
Akebia  Housemarks  will  become  non-exclusive  and  will  bear  a  royalty  of  [**]%  of  Net  Sales  in  each  country  in  the  Territory  in
which Licensee uses the Product Marks or Akebia Housemarks in connection with such Commercialization of the Licensed Product.

10.2. Termination  for  Breach.  Subject  to  the  terms  and  conditions  of  this  Section  10.2  (Termination  for  Breach),  a  Party  (the  “Non-
Breaching Party”) will have the right, in addition to any other rights and remedies, to terminate this Agreement in its entirety in the
event the other Party (the “Breaching Party”) is in material breach of any of its obligations under this Agreement; provided that the
Parties stipulate and agree that any breach by Licensee of its obligations under Section 4.3.3 (Development Diligence Obligations),
Section 4.4.4 (Commercialization Diligence Obligations), or Section 5.1.3 (Minimum Royalties) will each be a material breach of its
obligations under this Agreement with respect to which the terms of this Section 10.2 (Termination for Breach) will apply. The Non-
Breaching  Party  will  first  provide  written  notice  to  the  Breaching  Party,  which  notice  will  identify  with  particularity  the  alleged
breach and state the Non-Breaching Party’s intent to terminate this Agreement if such breach is not cured. With respect to material
breaches of any payment obligation hereunder, the Breaching Party will have a period of [**] after such written notice is provided to
cure such breach. With respect to all other breaches, the Breaching Party will have a period of [**] after the Non-Breaching Party
provides written notice to cure such breach.

10.3. Termination  for  Bankruptcy. Subject  to  the  terms  and  conditions  of  this  Agreement,  either  Party  may  terminate  this  Agreement
upon notice to the other Party should the other Party: (a) consent to the appointment of a receiver or a general assignment for the
benefit of creditors of the other Party that is not discharged within [**], or (b) file a petition under any bankruptcy or insolvency law
or have any such petition filed against it that has not been stayed within [**] of such filing.

10.4. Termination by Akebia for Patent Challenges.  If  Licensee  or  any  of  its  Affiliates  or  Sublicensees  Challenges  an  Akebia  Patent
Right  or  Joint  Patent  Right  in  any  country  throughout  the  world,  then  Akebia  may,  in  its  sole  discretion  either  (a)  terminate  this
Agreement in its entirety, or (b) leave the Agreement in effect, but increase the Incremental Royalties payable to Akebia pursuant to
Section 5.1 (Royalty Payments) by [**]% and, in any case, if Akebia so

39

chooses, sue Licensee for infringement in any forum of competent jurisdiction of Akebia’s choosing.

10.5. Termination by Licensee for Convenience. Commencing on the date that is 12 months following the Effective Date, Licensee may
terminate this agreement for convenience, without damage to Akebia, upon not less than 12 months’ prior written notice to Akebia
(i.e., any such termination would not be effective until at least 24 months following the Effective Date).

10.6. Termination by Licensee for Marketing Authorization or Exclusivity Failure. If (a) Licensee has actually submitted for approval
an  MAA  for  the  Licensed  Product  to  the  EMA,  the  EMA  rejects  such  MAA,  and  the  Parties  in  good  faith  agree  that,  based  on
communications from the EMA, submitting a modified MAA for the Licensed Product to the EMA will not result in approval of such
modified MAA, or (b) Licensee has used Commercially Reasonable Efforts to seek Regulatory Approval of the Licensed Product for
the Target Indication in the EMA, and [**], then in either case ((a) – (b)) Licensee may terminate this Agreement upon 30 days’ prior
written notice to Akebia.

10.7. Effects of Termination. In the event of any termination of this Agreement (but not expiration), the following will apply:

10.7.1. Right of Reference. The right of reference granted to Licensee pursuant to Section 4.2.4 (Right of Reference) will terminate.

The right of reference granted to Akebia pursuant to Section 4.2.4 (Right of Reference) will survive.

10.7.2. Return of Confidential Information. Licensee will cease using the Akebia Technology and will return to Akebia or destroy
all  copies  of  any  documents  containing  any  Akebia  Know-How.  Each  Party  will  return  or  destroy  all  Confidential
Information of the other Party in its possession upon expiration or termination of this Agreement at the disclosing Party’s
election and written request. The Receiving Party will provide a written confirmation of such destruction within [**] of such
request; provided, however, that the foregoing will not apply to any Confidential Information that is necessary to allow such
Party  to  perform  its  obligations  or  exercise  any  of  its  rights  that  expressly  survive  the  termination  or  expiration  of  this
Agreement.

10.7.3. License  Grants  to  Akebia.  Licensee  hereby  grants  and  agrees  to  grant  to  Akebia  with  effect  from  the  effective  date  of
termination,  an  exclusive,  fully  paid-up,  worldwide,  perpetual,  irrevocable  right  and  license,  with  the  right  to  grant
sublicenses  through  multiple  tiers,  under  Licensee’s  interest  in  all  Licensee  Technology  to  Develop,  Manufacture,
Commercialize,  and  otherwise  Exploit  the  Licensed  Product  inside  and  outside  of  the  Territory.  If  Licensee  is  unable  to
sublicense any Patent Rights or Know-How owned by Third Parties to Akebia as set forth under this Section 10.7.3 (License
Grants  to  Akebia)  without  the  consent  of  the  Third  Party,  then  Licensee  undertakes,  on  request  from  Akebia,  to  use
reasonable efforts to procure such licenses on behalf of Akebia in as far as it is able to do so, and Akebia will pay such fees
and agree to be bound by the terms agreed between Akebia and the Third Party licensor.

10.7.4. Appointment as Exclusive Distributor. If the Licensed Product is being Commercialized by Licensee in any country in the
Territory  as  of  the  effective  date  of  termination,  then,  at  Akebia’s  election  (in  its  sole  discretion)  on  a  country-by-country
basis in the Territory, until such time as all Regulatory Approvals with respect to such Licensed Product in such country have
been assigned and transferred to Akebia, either (a) Licensee will appoint Akebia or its designee as its exclusive distributor of
the Licensed Product in such country and grant Akebia or its designee the right to appoint sub-distributors, to the extent not
prohibited by any written agreement between Licensee or any of its Affiliates and a Third Party; provided that Akebia will
purchase any and all inventory of Licensed Product held by Licensee or its Affiliates as of the effective date of termination at
a price equal to [**] for such inventory, or (b) Licensee will have the continued right to sell the Licensed Product in such
country from its inventory; provided,

40

however,  that  Licensee’s  obligations  under  this  Agreement  with  respect  to  all  such  Licensed  Product  that  Licensee  sells,
including the obligation to remit royalties to Akebia hereunder, will continue in full force and effect during such period.

10.7.5. Assignment and Disclosure. Licensee will promptly (and in any event within [**] after the effective date of termination):
(a)  assign  and  transfer  to  Akebia  or  its  designee  all  of  Licensee’s  rights,  title,  and  interests  in  and  to  all  Regulatory
Submissions, Regulatory Approvals, clinical trial agreements, and distribution agreements (to the extent assignable and not
cancelled), confidentiality and other agreements, and Licensee Development Data (to the extent in Licensee’s Control), in
each case, relating to the Licensed Product and that are necessary or useful for the Exploitation of the Licensed Product, and
(b)  disclose  to  Akebia  all  documents  that  are  controlled  by  Licensee  or  that  Licensee  is  able  to  obtain  using  reasonable
efforts, and that embody the foregoing. In addition, Licensee will promptly assign and transfer to Akebia or its designee, as
of the effective date of termination, all of Licensee’s rights, title, and interests in and to all domain names associated with the
Product Marks (to the extent that they are owned by Licensee or its Affiliates), and will promptly (in any event, within [**]
after  the  effective  date  of  termination)  provide  to  Akebia  all  login  and  password  information  necessary  to  maintain  such
domain names. Subject to Section 10.7.6 (Termination by Licensee for Breach), the costs associated with the assignments set
forth in this Section 10.7.5 (Assignment and Disclosure) will be borne by Licensee.

10.7.6. Termination  by  Licensee  for  Breach.  Notwithstanding  any  provision  to  the  contrary  set  forth  under  this  Section  10.7
(Effects  of  Termination),  in  the  event  of  any  termination  of  this  Agreement  by  Licensee  for  Akebia’s  material  breach
pursuant  to  Section  10.2  (Termination  for  Breach),  Akebia  will  be  responsible  for  reimbursing  Licensee  for  the  costs
associated with the assignments set forth in Section 10.7.5 (Assignment and Disclosure).

10.8. Accrued Rights. Expiration or termination of this Agreement will not relieve the Parties of any liability that accrued hereunder prior
to the effective date of such expiration or termination, nor preclude either Party from pursuing all rights and remedies it may have
hereunder or at law or in equity with respect to any breach of this Agreement, and any such termination will be without prejudice to
the rights of either Party against the other. The remedies provided in this Article 10 (Term; Termination) are not exclusive of any
other remedies a Party may have in law or equity. Without limiting the generality of the foregoing, upon expiration or termination of
this Agreement Licensee will pay to Akebia all amounts due under this Agreement to Akebia as of the effective date of termination
or expiration within [**] following such effective date of termination or expiration. All payments made pursuant to this Section 10.8
(Accrued Rights) will be non-creditable and non-refundable.

10.9. No Waiver. The right of a Party to terminate this Agreement, as provided in this Article 10 (Term; Termination), will not be affected

in any way by its waiver or failure to take action with respect to any prior default.

10.10. Survival. Expiration or termination of this Agreement will not relieve the Parties of any obligation accruing hereunder prior to such
expiration  or  termination.  Without  limiting  the  foregoing,  the  following  provisions  will  survive  expiration  or  termination  of  this
Agreement: Article 1 (Definitions); Section 2.4 (License Grant to Akebia); Section 2.6 (Retained Rights); Section 2.7 (No Additional
Rights;  Compliance  with  [**]  License);  Section  4.2.4  (Right  of  Reference);  Section  4.3.7  (Licensee  Development  Data)  Section
4.10.2  (Ownership;  Branding)  (solely  with  respect  to  the  penultimate  and  ultimate  sentences  therein);  Section  4.10.3  (Trademark
License) (solely with respect to the ultimate sentence therein); Section 5.2 (Late Payments; Disputed Payments) through Section 5.5
(Accounting; Audit); Section 6.1 (Ownership); Section 6.2 (Prosecution and Maintenance of Akebia Patent Rights and Joint Patent
Rights) (solely with respect to Joint Patent Rights); Section 6.3 (Prosecution of Licensee Patent Rights); Section 6.4 (Enforcement of
Akebia Patent Rights, Joint Patent Rights, and Licensee Patent Rights in the Territory) (solely with respect to Joint Patent Rights and
Licensee Patent Rights); Section 6.5

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(Defense Against a Third Party Challenge to Akebia Patent Rights and Joint Patent Rights outside the Territory) (solely with respect
to Joint Patent Rights); Section 6.6 (Defense Against a Third Party Challenge to Joint Patent Rights in the Territory and Licensee
Patent  Rights);  Article  7  (Confidentiality);  Article  9  (Indemnification);  Section  10.7  (Effects  of  Termination)  through  this  Section
10.10 (Survival); Article 11 (Dispute Resolution; Governing Law); and Article 12 (Miscellaneous).

11.

DISPUTE RESOLUTION; GOVERNING LAW

11.1. Executive Officers; Disputes. Each Party will ensure that an Executive Officer is designated for such Party at all times during the
Term  for  dispute  resolution  purposes,  and  will  promptly  notify  the  other  Party  of  any  change  in  its  designated  Executive  Officer.
Except  as  expressly  set  forth  in  this  Agreement,  including  matters  subject  to  resolution  under  Section  3.6  (Decision-Making  and
Committee Dispute Resolution), in the event of a dispute arising under this Agreement between the Parties, the Parties will refer such
dispute  to  their  respective  Executive  Officer,  and  such  Executive  Officers  or  designees  will  attempt  in  good  faith  to  resolve  such
dispute.

11.2. Arbitration.  If  the  Parties  are  unable  to  resolve  a  given  dispute  within  [**]  of  referring  such  dispute  to  the  designated  Executive
Officers  pursuant  to  Section  11.1  (Executive  Officers;  Disputes),  then,  other  than  a  dispute  with  respect  to  the  validity,  scope,
enforceability, or ownership of any Patent Rights or other intellectual property rights under this Agreement (unless otherwise agreed
by the Parties), either Party may have such dispute settled by binding arbitration in the manner described below:

11.2.1. Arbitration Request. If a Party intends to begin an arbitration proceeding to resolve a dispute arising under this Agreement,
then such Party will provide written notice (the “Arbitration Request”) to the other Party of such intention and the issues
for  resolution.  From  the  date  of  the  Arbitration  Request  and  until  such  time  as  the  dispute  has  become  finally  settled,  the
running of the time periods within which a Party must cure a breach of this Agreement will be suspended with respect to the
subject matter of the dispute.

11.2.2. Additional  Issues.  Within  [**]  after  the  receipt  of  the  Arbitration  Request,  the  other  Party  may,  by  written  notice,  add

additional issues for resolution.

11.2.3. Arbitration Procedure. Except as expressly provided in this Agreement, any dispute, controversy, or claim arising out of or
in connection with this Agreement, including any question regarding its existence, validity, or termination, will be referred to
and  finally  resolved  by  binding  arbitration  administered  by  the  London  Court  of  International  Arbitration  (“LCIA”)  in
accordance with its rules as then in effect, which rules are deemed to be incorporated by reference into this Section 11.2.3
(Arbitration  Procedure).  There  will  be  one  arbitrator,  and  such  arbitrator  will  be  chosen  pursuant  to  the  LCIA  Rules.  The
seat, or legal place, of arbitration will be London, United Kingdom, or such other venue as the Parties agree. The language to
be  used  in  the  arbitral  proceedings  will  be  English.  THE  PARTIES  UNDERSTAND  AND  ACKNOWLEDGE  THAT
UNDER THIS SECTION 11.2.3 (ARBITRATION PROCEDURE) EACH PARTY WAIVES THE RIGHT TO A TRIAL BY
JURY  IN  CONNECTION  WITH  ANY  ARBITRABLE  CONTROVERSY  OR  CLAIM.  The  Parties  hereby  agree  that  the
arbitrator has authority to issue rulings and orders regarding all procedural and evidentiary matters that the arbitrator deems
reasonable and necessary with or without petition therefor by the Parties as well as the final ruling and judgment. All rulings
by  the  arbitrator  will  be  final.  Judgment  on  the  award  granted  in  any  arbitration  hereunder  may  be  entered  in  any  court
having  jurisdiction  over  the  award  or  any  of  the  Parties  or  any  of  their  respective  assets.  Nothing  in  this  Agreement  will
prevent either Party from seeking injunctive relief (or any other provisional remedy) from any court having jurisdiction over
the Parties and the subject matter of the dispute as necessary to protect either Party’s name, proprietary information, trade
secrets, Know-How, or any other proprietary right or otherwise to avoid irreparable harm. If  the  issues  in  dispute  involve
scientific or technical matters, then any arbitrator chosen hereunder will have educational training or experience

42

sufficient  to  demonstrate  a  reasonable  level  of  knowledge  in  the  field  of  biotechnology  and  pharmaceuticals.  The  Parties
agree that arbitration of any dispute will be confidential, and all claims, proceedings, and evidence provided in the arbitration
and all decisions of the arbitrators will be considered the Confidential Information of both Parties under this Agreement.

11.3.

Intellectual  Property  Disputes.  Notwithstanding  Section  11.2  (Arbitration),  if  a  dispute  arises  with  respect  to  the  validity,  scope,
enforceability, or ownership of any Patent Right or other intellectual property rights, and such dispute is not resolved in accordance
with Section 11.1 (Executive Officers; Disputes), then such dispute will not be submitted to an arbitration proceeding in accordance
with Section 11.2 (Arbitration), unless otherwise agreed by the Parties in writing, and instead, either Party may initiate litigation in a
court of competent jurisdiction in any country in which such rights apply.

11.4. Choice of Law; English Language. This Agreement and all amendments, modifications, alterations, or supplements hereto, and the
rights of the Parties hereunder, will be construed under and governed by the substantive laws of the State of New York, exclusive of
its conflicts of laws principles. This Agreement has been prepared in the English language and the English language will control its
interpretation.  All  consents,  notices,  reports,  and  other  written  documents  to  be  delivered  or  provided  by  a  Party  under  this
Agreement will be in the English language, and in the event of any conflict between the provisions of any document and the English
language translation thereof, the terms of the English language translation will control.

12.

MISCELLANEOUS

12.1. Assignment. Licensee may not assign its rights and obligations under this Agreement without Akebia’s prior written consent, except
that Licensee may assign this Agreement (in whole or in part) without such consent (a) in connection with the transfer or sale of all
or substantially all of its assets to a Third Party, (b) in the event of its merger or consolidation with another company, or (c) to an
Affiliate.  Licensee  will  provide  Akebia  with  prompt  written  notice  of  any  such  assignment.  Any  permitted  assignee  pursuant  to
clause (a) or (b) above will assume all obligations of its assignor under this Agreement, and no permitted assignment will relieve the
assignor of liability for its obligations hereunder. Any attempted assignment in contravention of the foregoing will be void. Akebia
may  assign  its  rights  and  obligations  under  this  Agreement  in  whole  or  in  part  without  Licensee’s  prior  written  consent,  but  will
inform Licensee of assignment as soon as possible following the effective date of such assignment, which obligation may be satisfied
through public disclosure.

12.2. Entire  Agreement;  Amendment.  This  Agreement,  together  with  all  exhibits  and  schedules  attached  hereto,  constitutes  the  entire
agreement  between  the  Parties  with  respect  to  the  subject  matter  hereof  including  that  certain  Mutual  Confidentiality  Agreement
dated  [**]  by  and  between  Licensee  and  Akebia  (the  “Non-Disclosure  Agreement”)  and  all  information  shared  by  the  Parties
pursuant to the Non-Disclosure Agreement will be Confidential Information under this Agreement, and the use and disclosure thereof
will be governed by Article 7 (Confidentiality). This Agreement will not be modified, or amended, except by another agreement in
writing executed by the Parties.

12.3.

Severability. If any provision of this Agreement is declared invalid by a court of last resort or by any court or other governmental
body from the decision of which an appeal is not taken within the time provided by law, then and in such event, this Agreement will
be deemed to have been terminated only as to the portion thereof that relates to the provision invalidated by that decision and only in
the relevant jurisdiction, but this Agreement will remain in force, in all other respects and all other jurisdictions; provided, however,
that if the provision so invalidated is essential to the Agreement as a whole, then the Parties will negotiate in good faith to amend the
terms  hereof  as  nearly  as  practical  to  carry  out  the  original  intent  of  the  Parties,  and,  failing  such  amendment,  either  Party  may
submit the matter for resolution pursuant to Article 11 (Dispute Resolution; Governing Law).

43

12.4. Notices.  All  notices  that  are  required  or  permitted  hereunder  will  be  in  writing  and  sufficient  if  delivered  by  internationally-
recognized  overnight  courier  or  sent  by  registered  or  certified  mail,  postage  prepaid,  return  receipt  requested,  and  in  each  case,
addressed as follows (with a courtesy copy sent by email, which will not constitute notice):

If to Akebia:

Akebia Therapeutics, Inc.
245 First Street
Cambridge, MA 02142
Attention: Chief Executive Officer
Email: [**]

with a copy to (which will not constitute notice):

Ropes & Gray LLP
800 Boylston Street; Prudential Tower
Boston, MA 02199
Attention: Hannah H. England
Email: [**]

If to Licensee:
Averoa
11 avenue Paul Verlaine
38 100 Grenoble – France
Attention – Chief Executive Officer
Email: [**]

with a copy to:

MCE Carrel
67 rue de Miromesnil
75008 Paris
Attention – Alexandra Carrel
Email: [**]

or to such other address as the Party to whom notice is to be given may have furnished to the other Party in writing in accordance
herewith. Any  such  notice  will  be  deemed  to  have  been  given:  (a)  on  the  Business  Day  after  dispatch  if  sent  by  internationally-
recognized overnight courier; or (b) on the fifth Business Day after dispatch if sent by registered or certified mail, postage prepaid,
return receipt requested.

12.5.

Force Majeure. Both Parties will be excused from the performance of their obligations under this Agreement to the extent that such
performance  is  prevented  by  force  majeure  and  the  nonperforming  Party  promptly  provides  notice  of  the  prevention  to  the  other
Party. Such  excuse  will  continue  only  so  long  as  the  condition  constituting  force  majeure  continues  and  the  nonperforming  Party
takes reasonable efforts to remove the condition. When the force majeure no longer exists, the affected Party must promptly resume
performance. For  purposes  of  this  Agreement,  “force  majeure”  will  include  conditions  beyond  the  reasonable  control  of  the  non-
performing Party, including an act of God, war, civil commotion, terrorist act, labor strike or lock-out, epidemic, pandemic, failure or
default  of  public  utilities  or  common  carriers,  destruction  of  production  facilities  or  materials  by  fire,  earthquake,  storm  or  like
catastrophe,  failure  of  plant  or  machinery  and  act  (or  failure  to  act)  of  a  government  of  any  country  or  of  any  Governmental
Authority (other than as a result of the non-performing Party’s failure to comply with Applicable Law). The Parties agree the effects
of  the  COVID-19  pandemic  that  is  ongoing  as  of  the  Effective  Date  may  be  invoked  as  a  force  majeure  for  the  purposes  of  this
Agreement even though the pandemic is ongoing to the extent those effects are not reasonably foreseeable by the Parties as of the
Effective Date. Notwithstanding the foregoing, a Party will not be excused from making undisputed payments that have accrued and
are owed hereunder because of a force

44

majeure affecting such Party. The affected Party will notify the other Party in writing of any force majeure circumstances that may
affect  its  performance  under  this  Agreement  as  soon  as  reasonably  practical,  will  provide  a  good  faith  estimate  of  the  period  for
which its failure or delay in performance under the Agreement is expected to continue based on currently available information, and
will  undertake  reasonable  efforts  necessary  to  mitigate  and  overcome  such  force  majeure  circumstances  and  resume  normal
performance  of  its  obligations  hereunder  as  soon  as  reasonably  practicable  under  the  circumstances.  If  the  force  majeure
circumstance continues, then the affected Party will update such notice to the other Party on a bi-weekly basis, or more frequently if
requested by the other Party, to provide updated summaries of its mitigation efforts and its estimates of when normal performance
under the Agreement will be able to resume. If Licensee’s failure to perform its obligations under this Agreement as a result of a
force  majeure  continues  for  longer  than  [**],  then  Akebia  may  terminate  this  Agreement  immediately  upon  written  notice  to
Licensee.

12.6.

12.7.

12.8.

Further Assurances. The Parties agree to reasonably cooperate with each other in connection with any actions required to be taken
as part of their respective obligations under this Agreement, and will (a) furnish to each other such further information; (b) execute
and deliver to each other such other documents; and (c) do such other acts and things (including working collaboratively to correct
any clerical, typographical, or other similar errors in this Agreement), all as the other Party may reasonably request for the purpose of
carrying out the intent of this Agreement.

Performance by Affiliates. Notwithstanding anything to the contrary set forth herein, either Party will have the right to perform any
or all of its obligations and exercise any or all of its rights under this Agreement through any Affiliate. Each Party hereby guarantees
the performance by its Affiliates of such Party’s obligations under this Agreement, and will cause its Affiliates to comply with the
provisions of this Agreement in connection with such performance.

Independent Contractors. It is expressly agreed that Akebia and Licensee will be independent contractors and that the relationship
between the two Parties will not constitute a partnership, joint venture or agency. Neither Akebia nor Licensee will have the authority
to make any statements, representations, or commitments of any kind, or to take any action that is binding on the other Party without
the prior written consent of the other Party.

12.9. Exit of the United Kingdom from E.U. At either Party’s request, the Parties will discuss and agree upon such amendments to this
Agreement as may be necessary to fairly and reasonably adjust the terms of this Agreement in light of the United Kingdom’s exit
from the E.U. Any  such  amendment  should  preserve  the  basic  economic  and  legal  terms  of  this  Agreement  insofar  as  possible  in
light of the change in circumstances caused by the United Kingdom’s exit from the E.U.

12.10. Agency. Except as expressly set forth herein, neither Party is, nor will be deemed to be an employee, agent, or representative of the
other  Party  for  any  purpose.  Each  Party  is  an  independent  contractor,  not  an  employee  or  partner  of  the  other  Party.  Except  as
expressly set forth herein, neither Party will have the authority to speak for, represent, or obligate the other Party in any way without
prior written authority from the other Party.

12.11. No Waiver. Any waiver of any provision of this Agreement will be effective only if in writing and signed by Akebia and Licensee.
Any omission or delay by either Party at any time to enforce any right or remedy reserved to it, or to require performance of any of
the  terms,  covenants,  or  provisions  hereof,  by  the  other  Party,  will  not  constitute  a  waiver  of  such  Party’s  rights  to  the  future
enforcement of its rights under this Agreement. Any waiver by a Party of a particular breach or default by the other Party will not
operate or be construed as a waiver of any subsequent breach or default by the other Party.

12.12. No Strict Construction. This Agreement has been prepared jointly by the Parties and will not be strictly construed against either

Party.

45

12.13. Interpretation. (a) Whenever any provision of this Agreement uses the term “including” (or “includes”), such term will be deemed
to mean “including without limitation” and “including but not limited to” (or “includes without limitations” and “includes but is not
limited  to”)  regardless  of  whether  the  words  “without  limitation”  or  “but  not  limited  to”  actually  follow  the  term  “including”  (or
“includes”); (b) “herein,” “hereby,” “hereunder,” “hereof,” and other equivalent words will refer to this Agreement in its entirety and
not  solely  to  the  particular  portion  of  this  Agreement  in  which  any  such  word  is  used;  (c)  all  definitions  set  forth  herein  will  be
deemed applicable whether the words defined are used herein in the singular or the plural; (d) wherever used herein, any pronoun or
pronouns will be deemed to include both the singular and plural and to cover all genders; (e) the recitals set forth at the start of this
Agreement, along with the schedules and exhibits to this Agreement, and the terms and conditions incorporated in such recitals and
schedules and exhibits will be deemed integral parts of this Agreement and all references in this Agreement to this Agreement will
encompass  such  recitals  and  schedules  and  exhibits  and  the  terms  and  conditions  incorporated  in  such  recitals  and  schedules  and
exhibits; provided that in the event of any conflict between the terms and conditions of this Agreement and any terms and conditions
set forth in the recitals, schedules, or exhibits, the terms of this Agreement will control; (f) in the event of any conflict between the
terms and conditions of this Agreement and any terms and conditions that may be set forth on any order, invoice, verbal agreement,
or otherwise, the terms and conditions of this Agreement will govern; (g) this Agreement will be construed as if both Parties drafted
it jointly, and will not be construed against either Party as principal drafter; (h) unless otherwise provided, all references to Sections,
Articles, and Schedules in this Agreement are to Sections, Articles, and Schedules of and to this Agreement; (i) any reference to any
federal,  national,  state,  local,  or  foreign  statute  or  law  will  be  deemed  to  also  refer  to  all  rules  and  regulations  promulgated
thereunder, unless the context requires otherwise; (j) wherever used, the word “shall” and the word “will” are each understood to be
imperative or mandatory in nature and are interchangeable with one another; (k) the word “or” will not be exclusive; (l) references to
a particular person include such person’s successors and assigns to the extent not prohibited by this Agreement; and (m) the section
headings  and  captions  used  herein  are  inserted  for  convenience  of  reference  only  and  will  not  be  construed  to  create  obligations,
benefits, or limitations.

12.14. Cumulative Remedies. No  remedy  referred  to  in  this  Agreement  is  intended  to  be  exclusive,  but  each  will  be  cumulative  and  in

addition to any other remedy referred to in this Agreement or otherwise available under law.

12.15. Further Actions. Each Party agrees to execute, acknowledge, and deliver such further instruments, and to do all such other acts, as

necessary or appropriate in order to carry out the purposes and intent of this Agreement.

12.16. Counterparts. This Agreement may be executed in counterparts, all of which taken together will be regarded as one and the same
instrument.  Counterparts  may  be  delivered  via  electronic  mail,  including  Adobe™  Portable  Document  Format  (PDF)  or  any
electronic signature complying with the U.S. Federal ESIGN Act of 2000, and any counterpart so delivered will be deemed to be
original signatures, will be valid and binding upon the Parties, and, upon delivery, will constitute due execution of this Agreement.

[Signatures Page Follows]

46

IN  WITNESS  WHEREOF,  the  Parties  intending  to  be  bound  have  caused  this  Agreement  to  be  executed  by  their  duly  authorized
representatives as of the Effective Date.

AVEROA SAS
By:

/s/ Luc-André Granier
Name: Luc-André GRANIER
Title: CEO

AKEBIA THERAPEUTICS, INC.
/s/ David Spellman
By:
Name: David Spellman
Title: Senior Vice President, Chief Financial Officer,
and Treasurer

KERYX BIOPHARMACEUTICALS, INC.
By:

/s/ David Spellman
Name: David Spellman
Title: Senior Vice President, Chief Financial Officer,
and Treasurer

[Signature Page to License Agreement]

    
    
Exhibit 23.1

We consent to the incorporation by reference in the following Registration Statements:

Consent of Independent Registered Public Accounting Firm

(1) Registration Statement (Form S-8 No. 333-196748) pertaining to the Amended and Restated 2008 Equity Incentive Plan, the 2014 Incentive Plan,

and the 2014 Employee Stock Purchase Plan of Akebia Therapeutics, Inc.,

(2) Registration Statement (Form S-8 No. 333-209469) pertaining to the 2014 Incentive Plan and the 2014 Employee Stock Purchase Plan of Akebia

Therapeutics, Inc.,

(3) Registration Statement (Form S-8 No. 333-216475) pertaining to the 2014 Incentive Plan and the 2016 Inducement Award Program of Akebia

Therapeutics, Inc.,

(4) Registration Statement (Form S-8 No. 333-222728) pertaining to the 2014 Incentive Plan and the 2016 Inducement Award Program of Akebia

Therapeutics, Inc.,

(5) Registration Statement (Form S-8 No. 333-228772) pertaining to the 2014 Incentive Plan of Akebia Therapeutics, Inc. and the 1999 Share Option
Plan, 2004 Long-Term Incentive Plan, 2007 Incentive Plan, Amended and Restated 2013 Incentive Plan, and 2018 Equity Incentive Plan of Keryx
Biopharmaceuticals, Inc.,

(6) Registration Statement (Form S-8 No. 333-229366) pertaining to the 2014 Incentive Plan, the 2014 Employee Stock Purchase Plan, and the

Inducement Grant Awards (January 2018 – December 2018) of Akebia Therapeutics, Inc.,

(7) Registration Statement (Form S-8 No. 333-233140) pertaining to the Amended and Restated 2014 Employee Stock Purchase Plan of Akebia

Therapeutics, Inc.,

(8) Registration Statement (Form S-8 No. 333-236060) pertaining to the 2014 Incentive Plan and the Inducement Grant Awards (January 2019 –

December 2019) of Akebia Therapeutics, Inc.,

(9) Registration Statement (Form S-8 No. 333-252336) pertaining to the 2014 Incentive Plan and the Inducement Grant Awards (January 2020 –

December 2020) of Akebia Therapeutics, Inc.,

(10)Registration Statement (Form S-3 No. 333-253539) of Akebia Therapeutics, Inc.,

(11)Registration Statement (Form S-8 No. 333-262392) pertaining to the 2014 Incentive Plan and the Inducement Grant Awards (January 2021 –

December 2021) of Akebia Therapeutics, Inc., and

(12)Registration Statement (Form S-8 No. 333-269457) pertaining to the 2014 Incentive Plan and the Inducement Grant Awards (January 2022 –

December 2022) of Akebia Therapeutics, Inc.;

of our reports dated March 10, 2023, with respect to the consolidated financial statements of Akebia Therapeutics, Inc. and the effectiveness of internal
control over financial reporting of Akebia Therapeutics, Inc. included in this Annual Report (Form 10-K) of Akebia Therapeutics, Inc. for the year ended
December 31, 2022.

/s/ Ernst & Young LLP

Boston, Massachusetts
March 10, 2023

Exhibit 31.1

CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, John P. Butler, certify that:

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K of Akebia Therapeutics, Inc.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this
report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the
financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-
15(f)) for the registrant and have:

(a)

(b)

(c)

(d)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in which this report is being prepared;

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our
supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for
external purposes in accordance with generally accepted accounting principles;

Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most
recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably
likely to materially affect, the registrant’s internal control over financial reporting; and

5.

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the
registrant’s auditors and the Audit Committee of the registrant’s Board of Directors (or persons performing the equivalent functions):

(a)

(b)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are
reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal
control over financial reporting.

Date:

March 10, 2023

By:

/s/ John P. Butler
John P. Butler
President, Chief Executive Officer and Director
(Principal Executive Officer)

Exhibit 31.2

CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, David A. Spellman, certify that:

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K of Akebia Therapeutics, Inc.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this
report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the
financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-
15(f)) for the registrant and have:

(a)

(b)

(c)

(d)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in which this report is being prepared;

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our
supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for
external purposes in accordance with generally accepted accounting principles;

Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most
recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably
likely to materially affect, the registrant’s internal control over financial reporting; and

5.

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the
registrant’s auditors and the Audit Committee of the registrant’s Board of Directors (or persons performing the equivalent functions):

(a)

(b)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are
reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal
control over financial reporting.

Date:

March 10, 2023

By:

/s/ David A. Spellman
David A. Spellman
Senior Vice President, Chief Financial Officer
and Treasurer
(Principal Financial Officer and Principal Accounting Officer)

CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 (18 U.S.C. Section 1350)

In connection with the accompanying Annual Report of Akebia Therapeutics, Inc. (the Company) on Form 10-K for the fiscal year ended December 31,
2022 (the Report), I, John P. Butler, as Chief Executive Officer and President of the Company, and I, David A. Spellman, as Senior Vice President, Chief
Financial Officer and Treasurer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act
of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Exhibit 32.1

Date:

March 10, 2023

Date:

March 10, 2023

By:

By:

/s/ John P. Butler
John P. Butler
President, Chief Executive Officer and Director
(Principal Executive Officer)

/s/ David A. Spellman
David A. Spellman
Senior Vice President, Chief Financial Officer
and Treasurer
(Principal Financial Officer and Principal Accounting Officer)