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Ligand Pharmaceuticals

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FY2022 Annual Report · Ligand Pharmaceuticals
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
_____________________________________________________________________________________________

_____________________________________________________________________________________________

FORM 10-K



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 No. 001-33093

(Exact name of registrant as specified in its charter)

LIGAND PHARMACEUTICALS INCORPORATED
Delaware
(State or other jurisdiction of
incorporation or organization)

3911 Sorrento Valley Boulevard, Suite 110
San Diego
CA
(Address of Principal Executive Offices)

Registrant’s telephone number, including area code: (858) 550-7500

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

77-0160744
(IRS Employer
Identification No.)

92121
(Zip Code)

Title of Each Class
Common Stock, par value $.001 per share

Trading Symbol
LGND

Name of Each Exchange on Which Registered
The Nasdaq Global Market

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

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 Section 15(d) of the Securities Exchange Act of 1934.    Yes  ☐    No  ☒
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 definition
of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. 
Large Accelerated Filer

 ☐  Emerging growth company

 ☐ 

☒ Accelerated Filer

Smaller reporting company

Non-accelerated Filer 

 ☐ 

 ☐ 

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 the registrant is a shell company (as defined in Exchange Act Rule 12b-2 of the Exchange Act).    Yes   ☐    No  ☒

The aggregate market value of the Registrant’s voting and non-voting stock held by non-affiliates was approximately $ 1.0 billion based on the last sales price of the Registrant’s Common Stock on
the Nasdaq Global Market of the Nasdaq Stock Market LLC on June 30, 2022. For purposes of this calculation, shares of Common Stock held by directors, officers and 10% stockholders known to
the Registrant have been deemed to be owned by affiliates which should not be construed to indicate that any such person possesses the power, direct or indirect, to direct or cause the direction of
the management or policies of the Registrant or that such person is controlled by or under common control with the Registrant.

As of February 22, 2023, the Registrant had 17,076,658 shares of Common Stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Proxy Statement for the Registrant’s 2023 Annual Meeting of Stockholders to be filed with the Commission within 120 days of December 31, 2022 are incorporated by reference in
Part III of this Annual Report on Form 10-K. With the exception of those portions that are specifically incorporated by reference in this Annual Report on Form 10-K, such Proxy Statement shall not
be deemed filed as part of this Report or incorporated by reference herein.

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
Consolidated 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, 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

1
17
34
35
35
35

35
37
37
46
46
88
88
88
88

92
92
92
92
92

93
93
98

 
Abbreviation

GLOSSARY OF TERMS AND ABBREVIATIONS

Definition

2023 Notes
Aldeyra
Amgen
ASC
ASU
Aziyo
Baxter
BeiGene
BendaRx
BLA
CASI
cGMP
Company
Convertible Note
COPD
Cormatrix
Corvus
CVR
CyDex
Daiichi Sankyo
Dianomi
DMF
ESG
ECM
Eisai
EPA
ESPP
EU
Exelixis
FASB
FDA
FSGS
FY 2022
FY 2021
FY 2020
GAAP
GCSF
Gilead
HBV
Hikma
Hovione
Icagen
IM
IND
IRS

$750.0 million aggregate principal amount of convertible senior unsecured notes due 2023
Aldeyra Therapeutics, Inc.
Amgen, Inc.
Accounting Standards Codification
Accounting Standards Update
Aziyo Med, LLC
Baxter International, Inc.
BeiGene, Ltd.
BendaRx Corp.
Biologics license application
CASI Pharmaceuticals, Inc.
Current Good Manufacturing Practice
Ligand Pharmaceuticals Incorporated, including subsidiaries
Senior Convertible Promissory Note
Chronic obstructive pulmonary disease
Cormatrix Cardiovascular, Inc.
Corvus Pharmaceuticals, Inc.
Contingent value right
CyDex Pharmaceuticals, Inc.
Daiichi Sankyo Company, Ltd.
Dianomi Therapeutics, Inc.
Drug Master File
Environmental, Social and Governance
Extracellular matrix
Eisai Inc.
Environmental Protection Agency
Employee Stock Purchase Plan, as amended and restated
European Union
Exelixis, Inc.
Financial Accounting Standards Board
U.S. Food and Drug Administration
Focal segmental glomerulosclerosis
The Company's fiscal year ended December 31, 2022
The Company's fiscal year ended December 31, 2021
The Company's fiscal year ended December 31, 2020
Generally accepted accounting principles in the United States
Granulocyte-colony stimulating factor
Gilead Sciences, Inc.
Hepatitis B Virus
Hikma Pharmaceuticals PLC
Hovione FarmCiencia, S.A.
Icagen, Inc.
Intramuscular
Investigational New Drug
Internal Revenue Service

IV
Jazz
Ligand
LTP
Marinus
Melinta
Merck
Metabasis
NDA
NOLs
Novan
Novartis
Nucorion
OmniAb
OMT
Ono
Opthea
Orange Book
Palvella
Par
Pfenex
Pfizer
Phoenix Tissue
PSU
R&D
RSU
Sage
SARM
SEC
Sedor
Seelos
Selexis
Sermonix
SII
SQ Innovation
Sunshine Lake Pharma
Takeda
Taurus
Tax Act
Teva
Travere
TR-Beta
Vernalis
Verona
Viking
xCella Biosciences

Intravenous
Jazz Pharmaceuticals, Inc.
Ligand Pharmaceuticals Incorporated, including subsidiaries
Liver targeting prodrug
Marinus Pharmaceuticals, Inc.
Melinta Therapeutics, Inc.
Merck & Co., Inc.
Metabasis Therapeutics, Inc.
New Drug Application
Net Operating Losses
Novan, Inc.
Novartis AG
Nucorion Pharmaceuticals, Inc.
OmniAb Operations, Inc. (f/k/a OmniAb, Inc.)
Open Monoclonal Technology, Inc.
Ono Pharmaceutical Co., Ltd.
Opthea Limited
Publication identifying drug products approved by the FDA based on safety and effectiveness
Palvella Therapeutics, Inc.
Par Pharmaceutical, Inc.
Pfenex Inc.
Pfizer, Inc.
Phoenix Tissue Repair
Performance stock unit
Research and Development
Restricted stock unit
Sage Therapeutics, Inc.
Selective Androgen Receptor Modulator
Securities and Exchange Commission
Sedor Pharmaceuticals, Inc., or RODES, Inc.
Seelos Therapeutics, Inc.
Selexis, SA
Sermonix Pharmaceuticals, LLC
Serum Institute of India
SQ Innovation, Inc.
Sunshine Lake Pharma Co., Ltd.
Takeda Pharmaceuticals Company Limited
Taurus Biosciences LLC
The Tax Cuts and Jobs Act
Teva Pharmaceuticals USA, Inc., Teva Pharmaceutical Industries Ltd. and Actavis, LLC
Travere Inc.
Thyroid hormone receptor beta
Vernalis plc
Verona Pharma plc
Viking Therapeutics
xCella Biosciences, Inc.

Xi'an Xintong
Zydus Cadila

Xi'an Xintong Medicine Research
Zydus Cadila Healthcare, Ltd

PART I

Cautionary Note Regarding Forward-Looking Statements:

You should read the following report together with the more detailed information regarding our company, our common stock and our financial statements and notes to those

statements appearing elsewhere in this document.

This report contains forward-looking statements that involve a number of risks and uncertainties. Although our forward-looking statements reflect the good faith judgment of
our management, these statements can only be based on facts and factors currently known by us. Consequently, these forward-looking statements are inherently subject to risks and
uncertainties, and actual results and outcomes may differ materially from results and outcomes discussed in the forward-looking statements.

Forward-looking statements can be identified by the use of forward-looking words such as “believes,” “expects,” “may,” “will,” “plan,” “intends,” “estimates,” “would,”

“continue,” “seeks,” “pro forma,” or “anticipates,” or other similar words (including their use in the negative), or by discussions of future matters such as those related to our
future results of operations and financial position, royalties and milestones under license agreements, Captisol material sales, product development, and product regulatory filings
and approvals, and the timing thereof, Ligand's status as a high-growth company, as well as other statements that are not historical. You should be aware that the occurrence of any
of the events discussed under the caption “Risk Factors” could negatively affect our results of operations and financial condition and the trading price of our stock.

The cautionary statements made in this report are intended to be applicable to all related forward-looking statements wherever they may appear in this report. We urge you

not to place undue reliance on these forward-looking statements, which speak only as of the date of this report. Except as required by law, we assume no obligation to update our
forward-looking statements, even if new information becomes available in the future. This caution is made under the safe harbor provisions of Section 21E of the Securities Exchange
Act of 1934, as amended.

References to “Ligand Pharmaceuticals Incorporated,” “Ligand,” the “Company,” “we,” “our” and “us” include Ligand Pharmaceuticals Incorporated and our wholly-owned

subsidiaries.

Partner Information

Information regarding partnered products and programs comes from information publicly released by our partners and licensees.

Trademarks

This Annual Report on Form 10-K includes trademarks, trade names and service marks owned by us. Ligand®, Advasep®, BEPro™, Bonsity®, Captisol®, CyDex®,

LTP®, LTP Technology™, Pelican Expression Technology™, PeliCRM™, Pfenex Expression Technology™ and XRPro® are protected under applicable intellectual property laws
and are our property. All other trademarks, trade names and service marks including, but not limited to OmniAb® Kyprolis®, Evomela®, Veklury®, Livogiva®, Bonteo®,
Zulresso®, Rylaze®, VAXNEUVANCE™, Pneumosil®, Minnebro®, Baxdela®, Conbriza®, Nexterone®, Noxafil®, Duavee®, OTORIN™, FILSPARI™ and LYTENAVA™ are
the property of their respective owners. Solely for convenience, trademarks, trade names and service marks referred to in this report may appear without the ®, ™ or 
 symbols, but
such references are not intended to indicate, in any way, that we will not assert, to the fullest extent under applicable law, our rights or the right of the applicable licensor to such
trademarks, trade names and service marks. Use or display by us of other parties’ trademarks, trade dress or products is not intended to and does not imply a relationship with, or
endorsement or sponsorship of, us by the trademark or trade dress owners.

SM

1

Item 1.

Business

Overview

Our business is focused on acquiring or funding programs and technologies that pharmaceutical companies use to discover and develop medicines. Our business model
provides a diversified portfolio of biotech and pharmaceutical product revenue streams that are supported by an efficient and low corporate cost structure. The biotechnology industry
is characterized by a binary clinical risk, in that, either a drug candidate is successfully developed and receives regulatory marketing approval, or the drug candidate fails in clinical
trials. Our goal is to offer investors an opportunity to participate in the promise of the biotech industry in a profitable and diversified manner while mitigating the binary clinical risk
associated with developing a single program.

Our business model is focused on funding mid to late-stage drug development in return for economic rights and out-licensing our technology platforms to help partners

discover and develop medicines. We partner with other pharmaceutical companies to leverage what they do best (late-stage development, regulatory management and
commercialization) ultimately to generate our revenue. Our Captisol platform technology is a chemically modified cyclodextrin with a structure designed to optimize the solubility
and stability of drugs. Our Pelican Expression Technology is a robust, validated, cost-effective and scalable platform for recombinant protein production that is especially well-suited
for complex, large-scale protein production where traditional systems are not. We have established multiple alliances, licenses and other business relationships with the world’s
leading pharmaceutical companies including Amgen, Merck, Pfizer, Jazz, Takeda, Gilead Sciences and Baxter International.

Our revenue consists of three primary elements: royalties from commercialized products, sales of Captisol material, and contract revenue from license, milestone and other

service payments. We selectively pursue acquisitions and drug development funding opportunities that address high unmet clinical needs to bring in new assets, pipelines, and
technologies to aid in generating additional potential new revenue streams.

OmniAb Separation and Spin-Off

On March 23, 2022, we entered into an Agreement and Plan of Merger (the Merger Agreement), by and among our company, Avista Public Acquisition Corp. II (New

OmniAb) and OmniAb, Inc., a Delaware corporation and then wholly-owned subsidiary of our company (OmniAb), and Orwell Merger Sub Inc. (Merger Sub), pursuant to which
New OmniAb combined with OmniAb, our then-antibody discovery business (the OmniAb Business), in a Reverse Morris Trust transaction. Pursuant to a Separation and
Distribution Agreement, dated as of March 23, 2022, among New OmniAb, our company and OmniAb (the Separation Agreement), we transferred the OmniAb Business, including
certain of our related subsidiaries, to OmniAb and, in connection therewith, distributed (the Distribution) to Ligand stockholders 100% of the common stock of OmniAb. Immediately
following the Distribution, in accordance with and subject to the terms and conditions of the Merger Agreement, Merger Sub merged with and into OmniAb (the Merger), with
OmniAb continuing as the surviving company in the Merger and as a wholly-owned subsidiary of New OmniAb.

Technologies

Through a combination of research and acquisitions, we have created a partnered portfolio with a wide variety of underlying technologies. This diversification provides the

added benefits of exposure to a wider variety of science, more licensing opportunities and lower impact of individual patent expiry.

Captisol Technology

Captisol is a patent-protected, chemically modified cyclodextrin with a structure designed to optimize the solubility and stability of drugs. This unique technology has enabled

several FDA-approved products, including Gilead’s Veklury, Amgen’s Kyprolis, Baxter International’s Nexterone, Acrotech Biopharma’s and CASI Pharmaceuticals’ Evomela,
Melinta Therapeutics’ Baxdela and Sage Therapeutics’ Zulresso. There are many Captisol-enabled products currently in various stages of development. We maintain a broad global
patent portfolio for Captisol with the latest expiration date in 2035. Other patent applications covering methods of making Captisol, if issued, extend to 2041.

In addition to solid Captisol powder, we offer our partners access to cGMP manufactured aqueous Captisol concentrate. This product offering was established in 2017 to reduce

cycle time and increase Captisol production capacity for large volume drug products. We maintain both Type IV and Type V DMFs with the FDA. These DMFs contain
manufacturing and safety information relating to Captisol that our licensees can reference when developing Captisol-enabled drugs. We also have active DMFs in Japan, China and
Canada. In 2022, commercial products using Captisol made up over half of our total royalty revenue.

2

Pelican Expression Technology™ Platform

The Pelican Expression Technology platform is a robust, validated, cost-effective and scalable platform for recombinant protein production, and is especially well-suited for

complex, large-scale protein production. Global manufacturers have demonstrated consistent success with the platform and the technology is currently out-licensed for multiple
commercial and development-stage programs. The versatility of the platform has been demonstrated in the production of enzymes, peptides, antibody derivatives and engineered non-
natural proteins. Partners seek the platform as it contributes significant value to biopharmaceutical development programs by reducing timelines and costs associated with research and
development through commercial manufacturing of therapeutics and vaccines. Given pharmaceutical industry trends toward large molecules with increased structural complexities,
the Pelican Expression Technology platform is well positioned to meet these growing needs as one of the most comprehensive and broadly available, commercially validated protein
production platform in the industry.

We acquired the Pelican Expression Technology through our acquisition of Pfenex in October 2020. Several of our partners have commercial products and late stage clinical

product candidates utilizing Pelican Expression Technology. In 2022, commercial products acquired from the Pfenex acquisition made up over one-third of our total royalty revenue.

HepDirect, LTP, and BEPro Technology Platform

The HepDirect and LTP platforms are our proprietary liver-targeting prodrug technologies that can deliver many different chemical classes of drugs to the liver by using a
chemical modification that renders an active pharmaceutical ingredient (API) biologically inactive until cleaved by a liver-specific enzyme. These technologies may improve the
efficacy and/or safety of certain drugs and can be applied to marketed or new drug products to treat liver diseases or diseases caused by hemostasis imbalance of circulating molecules
controlled by the liver.

The BEPro technology platform is a next generation prodrug technology distinct from HepDirect and LTP prodrug technologies, expanding use to non-liver related diseases.

BEPro is specifically applicable to nucleotides and nucleotide analogs for the development of compounds with improved product profiles. Ligand has demonstrated improvements in
cell penetration and oral, intravenous and inhaled pharmacokinetics with BEPro-enabled nucleotide analogs.

SUREtechnology Platform (owned by Selexis)

We acquired economic rights to various SUREtechnology Platform programs from Selexis. The SUREtechnology Platform, developed and owned by Selexis, is a novel

technology that improves the way that cells are utilized in the development and manufacturing of recombinant proteins and drugs.

Recent Business Updates

Travere Therapeutics recently received FDA accelerated approval for FILSPARI (sparsentan) for the treatment of immunoglobulin A nephropathy (IgAN). FILSPARI is the
first and only dual endothelin angiotensin receptor antagonist in development for rare kidney diseases and is the first non-immunosuppressive treatment indicated for IgAN. Travere
anticipates a review decision by the EMA on the potential approval for sparsentan for the treatment of IgAN in Europe in the second half of 2023. Additionally, Travere announced
that they expect to report top line results from the two-year confirmatory endpoints in the ongoing Phase 3 DUPLEX Study of sparsentan in focal segmental glomerulosclerosis
(FSGS) in the second quarter of 2023, with anticipated submission for full approval in the second half of 2023 in both the U.S. and Europe. Travere reported that it ended 2022 with
approximately $450 million in cash, cash equivalents and marketable securities, which would be available to support the commercial launch of sparsentan.

Novan announced it has submitted an NDA to the FDA seeking marketing approval for berdazimer gel, 10.3% (SB206) for the topical treatment of molluscum contagiosum

(MC). MC is an infection that causes skin lesions and affects approximately six million people in the U.S. annually. Novan anticipates a potential first quarter 2024 approval assuming
the filing is accepted by the FDA and standard review timelines.

Verona Pharma announced positive results of its Phase 3 ENHANCE-1 trial evaluating nebulized ensifentrine for the maintenance treatment of COPD. The ENHANCE-1 trial
met its primary and key secondary endpoints demonstrating significant improvements in lung function, symptoms and quality of life measures. In addition, ensifentrine substantially
reduced the rate and risk of COPD exacerbations. Ensifentrine was well tolerated over 24 and 48 weeks. In 2022, Verona announced that the Phase 3 ENHANCE-2 trial successfully
met its primary endpoint and secondary endpoints evaluating lung function and symptoms, and also significantly reduced the rate and risk of COPD exacerbations. Verona plans to
file an NDA for inhaled ensifentrine for the maintenance treatment of COPD with the FDA in the first half of 2023.

Viking Therapeutics announced the completion of patient enrollment in its Phase 2b clinical trial of VK2809, a novel liver-selective thyroid hormone receptor beta agonist, in

patients with biopsy-confirmed non-alcoholic steatohepatitis (NASH). Viking expects to report data for the study's primary endpoint in the first half of 2023.

3

Palvella Therapeutics announced its initial closing of up to $37.7 million in financing with proceeds to be used to advance the development of QTORIN rapamycin for the
treatment of pachyonychia congenita, microcystic lymphatic malformations (MLM), and for the prevention of basal cell carcinomas in Gorlin syndrome. Palvella expects top-line data
in mid-2023 from the Phase 3 pivotal study evaluating QTORIN rapamycin in pachyonychia congenita. Palvella is currently enrolling patients in a multicenter Phase 2b clinical study
in the U.S. and Europe for the prevention of basal cell carcinomas in patients with Gorlin syndrome, with data expected in the first half of 2023. Additionally, Palvella expects to
report data in the first quarter of 2023 from a multicenter Phase 2 study in the U.S. investigating QTORIN rapamycin for the treatment of MLM.

In 2022, Jazz Pharmaceuticals announced FDA approval of Monday/Wednesday/Friday intramuscular dosing of Rylaze (asparaginase erwinia chrysanthemi (recombinant)-

rywn) and submission of a supplemental BLA under the Real-time Oncology Review Program seeking approval for IV administration. Jazz also completed the Marketing
Authorization Application submission to the EMA for both IV and IM administration, with a potential approval in 2023. Jazz is also advancing the program for potential submission,
approval and launch in Japan.

Xi'an Xintong Pharmaceuticals announced pradefovir reached the primary and secondary endpoints in its Phase 3 clinical trial in China for the treatment of chronic hepatitis B.
The 48-week statistical analysis showed that pradefovir was comparable to the first-line drug, tenofovir disoproxil fumarate, with a better safety profile. Xi'an Xintong has submitted a
pre-NDA conference communication application with China’s National Medical Products Administration (NMPA) and expects to submit an NDA in the first quarter of 2023.

China Resources Double-Crane Pharmaceuticals announced the IND for CX2101A, a small molecule, RNA-dependent RNA polymerase inhibitor of SARS-CoV-2 that utilizes

Ligand's proprietary BEPro prodrug technology, was approved by the NMPA for use in clinical trials for the treatment of novel coronavirus pneumonia in China.

Aldeyra announced the submission of an NDA to the FDA for topical ocular reproxalap for the treatment of signs and symptoms of dry eye disease. Reproxalap is a small-

molecule modulator of RASP (reactive aldehyde species), which are elevated in ocular and systemic inflammatory disease.

Arcellx initiated a Phase 1 study of ARCL-002 in acute myeloid leukemia and myelodysplastic syndromes. ARCL-002 utilizes the Pelican Expression Technology.

Merck announced the European Medicines Agency has recommended approval of VAXNEUVANCE for active immunization for the prevention of invasive disease,
pneumonia and acute otitis media caused by Streptococcus pneumoniae in individuals from 6 weeks to less than 18 years of age. VAXNEUVANCE is a 15-valent pneumococcal
vaccine utilizing Ligand’s CRM197 vaccine carrier protein and is currently authorized for use in the European Union for individuals 18 years of age and older and is approved in the
United States for individuals 6 weeks of age and older. In July 2022 Merck started a broad Phase 3 program for V116, their investigational 21-valent pneumococcal conjugate vaccine
utilizing Ligand’s CRM197 vaccine carrier protein.

Sermonix Pharmaceuticals announced results of its ELAINE 1 Phase 2 study of lasofoxifene vs. fulvestrant in postmenopausal women with locally advanced or metastatic

ER+/HER2- breast cancer and an ESR1 mutation. Median progression-free survival was 6.04 months for lasofoxifene vs. 4.04 months for fulvestrant (p=0.138). Objective response
rate was 13.2% for lasofoxifene vs. 2.9% for fulvestrant, (p=0.12), with 1 complete response and 4 partial responses in the lasofoxifene arm vs. no complete responses and 1 partial
response in the fulvestrant arm. While the study was not powered for statistical significance, all endpoints numerically favored lasofoxifene.

In February 2022, BeiGene, Ltd. announced the launch of KYPROLIS® (carfilzomib) for injection in China for patients with relapsed/refractory (R/R) multiple myeloma.
KYPROLIS is licensed to BeiGene in China under a strategic collaboration with Amgen, and was approved in July 2021 by the China National Medical Products Administration
(NMPA) in combination with dexamethasone for the treatment of adult patients with R/R multiple myeloma who have received at least two prior therapies, including a proteasome
inhibitor and an immunomodulatory agent.

Outlook Therapeutics announced it submitted a BLA to the FDA for ONS-5010, an investigational ophthalmic formulation of bevacizumab for the treatment of wet age-related

macular degeneration that, if approved, will be branded as LYTENAVA™ (bevacizumab-vikg).

Corporate and Governance Highlights

We are committed to policies and practices focused on environmental sustainability, positively impacting our social community and maintaining and cultivating good corporate

governance. By focusing on such ESG policies and practices, we believe we can affect a meaningful and positive change in our community and maintain our open, collaborative
corporate culture. We will continue our proactive shareholder and employee engagement in 2023. See www.ligand.com for information about our ESG policies and practices. The
information contained on our website is not intended to be part of this filing.

4

Commercial and Clinical Stage Partnered Portfolio

We have a large portfolio of assets currently generating royalties and future potential revenue-generating programs, including over 100 fully-funded by our partners. Each
white dot on our partnered pipeline chart below represents a fully-funded partnered program, with each section of the chart representing a major Ligand technology or platform.

Royalties on Commercial Products

We currently receive royalties on more than ten commercial products. The following table provides an overview of our current portfolio of royalties:

Product

Kyprolis
Teriparatide
Evomela
Rylaze
Nexterone
Pneumosil
Vaxneuvance
Other

Partner

Therapeutic Area

Amgen/Ono/Beigene
Alvogen
Acrotech/CASI
Jazz
Baxter
Serum Institute
Merck
Various

Cancer
Women's Health
Cancer
Cancer
Cardiovascular
Infectious Disease
Infectious Disease
Various

Royalty Rate

1.5% - 3.0%
25%-40%¹
20%
Low single digit
Low single digit
Low single digit
Low single digit
Various

2022 Royalty
Revenue (in millions)

$30.1
$15.8
$10.2
$8.8
$3.6
$2.6
$1.1
$0.3

Estimated 2022

Product Revenue
 (in millions)
$1,275.6
N/A
$51.0
$278.7
$56.8
$114.7
$159.0
$18.0

(¹) We receive tiered profit sharing of 25% on quarterly profits less than $3.75 million, 35% on quarterly profits greater than $3.75 million but less than $7.5 million and 40% on quarterly profits greater than
$7.5million. If therapeutic equivalence is achieved, quarterly profit changes to 50% of quarterly profits.

5

Portfolio Overview

We have assembled one of the largest portfolios of biopharmaceutical assets in the industry which provides investors the opportunity to participate in the biotech industry while
mitigating the clinical binary risk typically associated with the industry. Our portfolio consists of assets which currently generate revenue through royalties on commercial products as
well as Captisol sales on commercial products. In addition to these assets, we have a substantial pipeline of development stage assets that currently generate contractual payments
through milestone and license fees with future potential for royalties and Captisol material sales for those programs under our Captisol technology.

Partner Name

Acrotech/CASI
Alvogen/Adalvo
Alvogen/Hikma/Nanjing King-Friend
Amgen/Beigene/Ono
Aziyo
Baxter
Biocad
Exelixis/Daiichi-Sankyo
Gilead
Jazz
Melinta
Menarini
Merck
Merck
Par
Pfizer
Pfizer
Sage
Sedor/Lupin
Serum Institute of India
Zydus Cadila
Zydus Cadila
Zydus Cadila
Zydus Cadila
Zydus Cadila

Approved

Program

Therapeutic Area

Evomela
Teriparatide
Voriconazole
Kyprolis
ECM portfolio
Nexterone
Teberif
Minnebro
Veklury
Rylaze
Baxdela
Frovatriptan
Noxafil-IV
Vaxneuvance
Posaconazole
Duavee
Vfend-IV
Zulresso
Sesquient
Pneumosil
Vivitra
Bryxta/ZyBev
Maropitant
Exemptia
Vortuxi

Cancer
Women's Health
Infectious Disease
Cancer
Medical device/Cardiology
Cardiovascular
Inflammatory/Metabolic
Cardiovascular
Infectious Disease
Cancer
Infectious Disease
Central Nervous System
Infectious Disease
Infectious Disease
Infectious Disease
Inflammatory/Metabolic
Infectious Disease
Central Nervous System
Central Nervous System
Infectious Disease
Cancer
Cancer
Central Nervous System
Inflammatory/Metabolic
Inflammatory/Metabolic

Partner Name

Program

Therapeutic Area

Phase 3/Pivotal or Regulatory Submission Stage

Aldeyra
BendaRx
Cantex
Eisai
Escape Bio
Marinus

Reproxalap
Bendamustine
CX-01
FYCOMPA
S1P5 agonist
Ganaxalone IV

6

Other/Undisclosed
Oncology
Oncology
Central Nervous System
TBD
Central Nervous System

Meridian
Merck
Novan
Novartis
Opthea
Outlook Therapeutics
Palvella
Serum Institute
SQ Innovation
Sunshine Lake
Travere
Verona
Various
Xi'an Xintong

ML-141
V116
SB206
Mekinist (CE-Trametinib)
OPT-302
ONS-5010
PTX-022
CRM197
CE-Furosemide
Vilazodone
Sparsentan
Ensifentrine (RPL554)
Teriparatide
Pradefovir

Oncology
Pneuococcal adult
Infectious Disease
Cancer
Ophthalmology
Other/Undisclosed
Other/Undisclosed
Infectious Disease
Cardiovascular disease
Central Nervous System
Severe and Rare
Respiratory Disease
Women's Health
Infectious Disease

Partner Name

Phase 2

Program

Therapeutic Area

Acrivon
Corvus
DeNovo
Merck
Oncternal
Phoenix Tissue
Seelos
Sermonix
Ohara Pharmaceuticals
Verona
Verona
Viking
Viking
Xi'an Xintong

Partner Name

Apotex
China Resources Double Crane
CSL
Foghorn
Jazz
MEI Pharma
Merck
Novartis
Novartis

ACR-368
Ciforadenant
Lisfensine
V116
Cirmtuzumab
PTR-01
Aplindore
Lasofoxifene
JPH-203
Ensifentrine
Ensifentrine
VK5211
VK2809
MB07133

Phase 1

Program

Meloxicam
CX2101A
CSL-324
FHD-609/BRD9
JZP-341
ME-344
V117
MIK-665
BCL-201

7

Cancer
Cancer
Neurology
Infectious Disease
Cancer
Genetic Disease
Central Nervous System
Cancer
Cancer
Asthma
Cystic Fibrosis
Inflammatory/Metabolic
Inflammatory/Metabolic
Cancer

Therapeutic Area

Migraine
COVID 19
Immunology
Cancer
Long Acting Erwinia Asparaginase
Cancer
Pneumococcal
Cancer
Cancer

Nucorion
Revision Therapeutics
Sage
Takeda
Takeda
Vaxxas
Viking
Jupiter Biomed

Acquisitions

NUC-1010
Rev0100
SAGE-689
TAK-925
TAK-243
Nanopatch
VK-0214
Viright

Infectious disease
Ophthalmology
Central Nervous System
Severe and Rare
Cancer
Infectious Disease
Genetic Disease
Cancer

We are a company devoted to identifying cutting-edge science and have exhibited a track record of capital deployment to create a high growth business model that operates

with an efficient and low corporate cost structure. Over the last 15 years we have deployed approximately $1 billion of capital to build our portfolio. Following the spin-off of our
OmniAb antibody discovery business, our strategy is to continue to expand our pipeline by acquiring additional revenue streams on both early and late stage drug product candidates
from third parties, as well as acquiring commercial stage drugs for sale. Expanding our pipeline through these acquisitions can allow for further diversification across therapeutic
areas and development stages. The following is a timeline of acquisitions we've completed over the last 15 years:

Selected Commercial Programs

The following programs represent important revenue-generating components of our current portfolio. For information about the royalties owed to us for these programs, see

“Royalties” later in this business section.

Kyprolis (Amgen, Ono, BeiGene)

We supply Captisol to Amgen for use with Kyprolis (carfilzomib), and granted Amgen an exclusive product-specific license under our patent rights with respect to Captisol.

Kyprolis is formulated with Ligand’s Captisol technology and is approved in the United States for the following:

•

•

In combination with dexamethasone, lenalidomide plus dexamethasone, daratumumab plus dexamethasone, or daratumumab and hyaluronidase-fihj and dexamethasone, or
isatuximab and dexamethasone for the treatment of patients with relapsed or refractory multiple myeloma who have received one to three lines of therapy.
As a single agent for the treatment of patients with relapsed or refractory multiple myeloma who have received one or more lines of therapy.

Our agreement with Amgen may be terminated by either party in the event of material breach or bankruptcy, or unilaterally by Amgen with prior written notice, subject to
certain surviving obligations. Absent early termination, the agreement will terminate upon expiration of the obligation to pay royalties. Under this agreement, we are entitled to receive
revenue from clinical and commercial Captisol material sales and royalties on annual net sales of Kyprolis based on our patents and applications relating to the Captisol component of
Kyprolis which are not expected to expire until 2033.

8

Teriparatide Injection Product (PF708) (Alvogen/Adalvo)

We acquired the Teriparatide Injection product with the acquisition of Pfenex in October 2020. Teriparatide Injection is a drug indicated for uses including the treatment of

osteoporosis in certain patients at high risk for fracture. Teriparatide Injection was developed using our Pelican Expression Technology™ and was approved by the FDA in 2019 in
accordance with the 505(b)(2) regulatory pathway, with FORTEO as the reference product. Our commercialization partner, Alvogen launched the product in June 2020 in the United
States.

Our partner Alvogen has exclusively licensed the rights to commercialize and manufacture the Teriparatide Injection product in the United States, while Adalvo has the rights
to commercialize in the EU, certain countries in the Middle East and North Africa (MENA), and the rest of world (ROW) territories (the latter defined as all countries outside of the
EU, U.S. and MENA, excluding Mainland China, Hong Kong, Singapore, Malaysia and Thailand). In August 2020, marketing authorizationb throughout the EU was received under
the trade name Livogiva and in December 2020 in Saudi Arabia under the name Bonteo. In December of 2022, we terminated a license agreement with Beijing Kangchen Biological
Technology Co., Ltd. (Kangchen) thereby regaining the right to commercialize PF708 in Mainland China, Hong Kong, Singapore, Malaysia and Thailand along with a non-exclusive
right to conduct development activities in such countries with respect to PF708.

In accordance with our agreements with Alvogen, we are eligible to receive tiered gross profit sharing of between 25% and 40% of quarterly profits prior to an “A” therapeutic

equivalence designation, which increases to a flat 50% if an “A” rating is achieved.

In accordance with our EU, MENA and ROW agreements with Adalvo, we may be eligible to receive additional upfront and milestone payments of $1.5 million and may also

be eligible to receive up to 60% of gross profit derived from product sales and regional license fees, if approved, depending on geography, cost of goods sold and sublicense fees.

Evomela (Acrotech and CASI)

We supply Captisol to, and receive royalties from, Acrotech Biopharma for sales of Evomela in the U.S., and CASI Pharmaceuticals for sales in China. Evomela received
market approval by the NMPA in August of 2019. It is the only approved and commercially available melphalan product in China. Evomela is a Captisol-enabled melphalan IV
formulation which is approved by the FDA for use in two indications:

•

•

a high-dose conditioning treatment prior to autologous stem cell transplantation (ASCT) in patients with multiple myeloma; and

for the palliative treatment of patients with multiple myeloma for whom oral therapy is not appropriate.

Evomela has been granted Orphan Designation by the FDA for use as a high-dose conditioning regimen for patients with multiple myeloma undergoing ASCT. The Evomela

formulation avoids the use of propylene glycol, which has been reported to cause renal and cardiac side-effects that limit the ability to deliver higher quantities of therapeutic
compounds. The use of the Captisol technology to reformulate melphalan is anticipated to allow for longer administration durations and slower infusion rates, potentially enabling
clinicians to safely achieve a higher dose intensity of pre-transplant chemotherapy.

Under the terms of the license agreement, Acrotech Biopharma has marketing rights worldwide excluding China and CASI Pharmaceuticals has rights to market in China. We

are eligible to receive over $50 million in potential milestone payments under this agreement, royalties on global net sales of the Captisol-enabled melphalan product and revenue
from Captisol material sales. Acrotech and CASI’s obligation to pay royalties will expire at the end of the life of the relevant patents or when a competing product is launched,
whichever is earlier, but in no event before ten years after the commercial launch. Our patents and applications relating to the Captisol component of melphalan are not expected to
expire until 2033. As described herein, we have entered into a settlement agreement with Teva and Acrotech Biopharma (the holder of the NDA for Evomela) which will allow Teva to
market a generic version of Evomela in the United States in 2026, or earlier under certain circumstances. Absent early termination, the agreement will terminate upon expiration of the
obligation to pay royalties. The agreement may be terminated by either party for an uncured material breach or unilaterally by Acrotech and CASI by prior written notice.

Vaxneuvance (Merck)

Vaxneuvance, a 15-valent pneumococcal conjugate vaccine, also known as V114, was approved in the U.S. in July of 2021 for the prevention of invasive disease caused by

Streptococcus pneumoniae serotypes 1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, 22F, 23F and 33F in adults 18 years of age and older, and subsequently in children 6 weeks
through 17 years of age in June of 2022. Vaxneuvance was also approved in Europe in October 2022 for the prevention of invasive disease and pneumonia caused by Streptococcus
pneumoniae in individuals 18 years and older and in infants, children and adolescents from 6 weeks to less than 18 years of age. VAXNEUVANCE utilizes CRM197 vaccine carrier
protein, which is produced using the patent-protected Pelican Expression Technology™ platform. We are entitled to low single digit royalties derived from net sales

9

of Vaxneuvance.

Pneumosil (Serum Institute of India, SII)

SII began commercialization of its 10-valent pneumococcal conjugate vaccine, Pneumosil, which is produced using CRM197 made in the Pelican Expression Technology
platform, in the second quarter of 2020. Pneumosil is designed primarily to help fight against pneumococcal pneumonia among children, with an advantage of targeting the most
prevalent serotypes of the bacterium causing serious illness in developing countries. Pneumosil achieved WHO Prequalification in December 2019, allowing the product to be
procured by United Nations agencies and Gavi, the Vaccine Alliance, and subsequently achieved Indian Marketing Authorization in July 2020, and SII announced commercial launch
of the product in India in December 2020.

Rylaze (Jazz Pharmaceuticals)

In July 2021, Jazz announced the US launch of Rylaze (asparaginase erwinia chrysanthemi (recombinant)-rywn), previously referred to as JZP458. Rylaze, which was
approved by the FDA in June 2021, is a recombinant erwinia asparaginase used as a component of a multi-agent chemotherapeutic regimen for the treatment of acute lymphoblastic
leukemia (ALL) or lymphoblastic lymphoma (LBL) in adult and pediatric patients one month or older who have developed hypersensitivity to E. coli-derived asparaginase.
Additionally, Jazz is utilizing our technology for the development of PF745 (JZP341), a long-acting Erwinia asparaginase for the treatment of ALL and other hematological
malignancies. Jazz has worldwide rights to develop and commercialize PF745.

Ligand is eligible to receive up to $155.5 million in milestone payments and tiered low to mid-single digit royalties based on worldwide net sales of any products resulting

from this collaboration, including Rylaze.

Nexterone (Baxter)

We have a license agreement with Baxter, related to Baxter's Nexterone, a Captisol-enabled formulation of amiodarone, which is marketed in the United States and Canada. We
supply Captisol to Baxter for use in accordance with the terms of the license agreement under a separate supply agreement. Under the terms of the license agreement, we will continue
to earn milestone payments, royalties, and revenue from Captisol material sales. We earn royalties on net sales of Nexterone through early 2033.

Veklury (Gilead)

We supply Captisol to Gilead for sales of Veklury (remdesivir). Gilead received marketing approval from the FDA in October 2020. Veklury is an antiviral treatment of
COVID-19 that is FDA approved. The product has regulatory approvals for the treatment of moderate or severe COVID-19 in over 70 countries. We are supplying Captisol to Gilead
under a 10-year supply agreement. We are also supplying Captisol to Gilead’s voluntary licensing generic partners who are manufacturing remdesivir for 127 low- and middle-income
countries. We receive our commercial compensation for this program through the sale of Captisol.

Zulresso (Sage)

We have a license agreement with Sage, related to Sage''s Zulresso, a Captisol-enabled formulation of brexanolone for the treatment of postpartum depression (PPD). Under the

terms of the agreement, we receive royalties and revenue from Captisol material sales.

Noxafil-IV (Merck)

We have a supply agreement with Merck related to Merck’s NOXAFIL-IV, a Captisol-enabled formulation of posaconazole for IV use. NOXAFIL-IV is marketed in the

United States, EU, Japan and Canada. We receive our commercial compensation for this program through the sale of Captisol.

Duavee or Duavive (Pfizer)

Pfizer is responsible for the marketing of bazedoxifene, a synthetic drug specifically designed to reduce the risk of osteoporotic fractures while also protecting uterine tissue.

Pfizer has combined bazedoxifene with the active ingredient in Premarin to create a combination therapy for the treatment of post-menopausal symptoms in women. Pfizer is
marketing the combination treatment under the brand names Duavee and Duavive in various territories. Net royalties on annual net sales of Duavee/Duavive are payable to us through
the life of the relevant patent or ten years from the first commercial sale, whichever is longer, on a country by country basis.

Exemptia, Vivitra, Bryxta and Zybev (Zydus Cadila)

Zydus Cadila’s Exemptia (adalimumab biosimilar) is marketed in India for autoimmune diseases. Zydus Cadila uses the Selexis technology platform for Exemptia. We earn

royalties on sales by Zydus Cadila for ten years following approval.

10

Zydus Cadila’s Vivitra (trastuzumab biosimilar) is marketed in India for breast cancer. Zydus Cadila uses the Selexis technology platform for Vivitra. We are entitled to earn

royalties on sales by Zydus Cadila for ten years following approval.

Zydus Cadila’s Bryxta and Zybev (bevacizumab biosimilar) is marketed in India for various indications. Zydus Cadila uses the Selexis technology platform for Bryxta and

Zybev. We earn royalties on sales by Zydus Cadila for ten years following approval.

Summary of Selected Development Stage Programs

We have multiple fully-funded partnered programs that are either in or nearing the regulatory approval process, or given the area of research or value of the license terms, we
consider particularly noteworthy. We are eligible to receive milestone payments and royalties on these programs. This list does not include all of our partnered programs. In the case
of Captisol-related programs, we are also eligible to receive revenue for the sale of Captisol material supply. The following table represents development stage assets with disclosed
royalties:

Development stage assets with disclosed royalties

Program
CE-Fosphenytoin
CE-Meloxicam
Ciforadenant
DGAT-1
Ensifentrine (RPL554)
FBPase Inhibitor (VK0612)
Lasofoxifene
MB07133
ME-344
Oral EPO
Pradefovir
PTX-022
SARM (VK5211)
SB206
Sparsentan
TR Beta (VK2809 and VK0214)
Various
Various

Sparsentan (Travere)

Licensee
Sedor
Sedor
Corvus
Viking
Verona
Viking
Sermonix
Xi'an Xintong
MEI Pharma
Viking
Xi'an Xintong
Palvella
Viking
Novan
Travere
Viking
Nucorion
Seelos

Royalty Rate
11%
8.0% - 10.0%
Mid-single digit to low-teen royalty
3.0% - 7.0%
Low to mid-single digit royalty
7.5% - 9.5%
6.0% - 10.0%
6%
Low single digit royalty
4.5% - 8.5%
9%
5.0% - 9.8%
7.25% - 9.25%
7.0% - 10.0%
9%
3.5% - 7.5%
4.0% - 9.0%
4.0% - 10.0%

In early 2012, Ligand licensed the world-wide rights to sparsentan to Travere Therapeutics. Travere recently received FDA accelerated approval for FILSPARI (sparsentan) for

the treatment of immunoglobulin A nephropathy (IgAN). FILSPARI is the first and only dual endothelin angiotensin receptor antagonist in development for rare kidney diseases and
is the first non-immunosuppressive treatment indicated for IgAN. Travere anticipates a review decision by the EMA on the potential approval for sparsentan for the treatment of IgAN
in Europe in the second half of 2023. Additionally, Travere announced that they expect to report top line results from the two-year confirmatory endpoints in the ongoing Phase 3
DUPLEX Study of sparsentan in focal segmental glomerulosclerosis (FSGS) in the second quarter of 2023, with anticipated submission for full approval in the second half of 2023 in
both the U.S. and Europe.

Under our license agreement with Travere, we are entitled to receive over $66 million in potential milestone payments, as well as 9% in royalties on any future worldwide

sales.

TR-Beta - VK2809 and VK0214 (Viking)

Our partner, Viking, is developing VK2809, a novel selective thyroid hormone receptor beta (TR-beta) agonist with potential in multiple indications, including

hypercholesterolemia, dyslipidemia and NASH. VK2809 is currently in a Phase 2b clinical trial (the VOYAGE study) in patients with biopsy-confirmed NASH. VK0214, another
novel, orally available, TR-beta

11

agonist, is in development for the potential treatment of X-linked adrenoleukodystrophy (X-ALD). VK0214 is currently being evaluated in a Phase 1b clinical trial in patients with the
adrenomyeloneuropathy (AMN) form of X-ALD. Under the terms of the agreement with Viking, we may be entitled to up to $375 million of development, regulatory and commercial
milestones and tiered royalties on potential future sales. Our TR Beta programs partnered with Viking are subject to CVR sharing and a portion of the cash received will be paid out to
CVR holders.

CRM197

CRM197 is a non-toxic mutant of diphtheria toxin. It is a well characterized protein and functions as a carrier for polysaccharides and haptens, making them immunogenic.

CRM197 is used in prophylactic and therapeutic vaccine candidates. We have developed CRM197 production strains using our Protein Expression Technology platform and supply
preclinical grade and cGMP CRM197 (PeliCRM™) to several vaccine development focused pharmaceutical customers.

Our partners Merck and SII have exclusively licensed unique production strains for use in their conjugate vaccine products and candidates for pneumococcal and meningitis

bacterial infections. Pneumococcus bacterium (Streptococcus pneumoniae) is a leading cause of severe pneumonia and major cause of morbidity and mortality worldwide. In
accordance with our CRM197 commercial license agreements with Merck, we are eligible to earn an additional $8 million in development and regulatory milestones and low single
digit royalties derived from net sales, depending on territory. CRM-197 made in the Pelican Expression Technology platform is also used by Merck in its investigational vaccine
candidates, including V116, a 21-valent pneumococcal conjugate vaccine currently in Phase 3 clinical trials.

Ensifentrine – RPL554 (Verona)

Ensifentrine is a first-in-class, selective dual inhibitor of phosphodiesterase 3 and 4 enzymes combining bronchodilator and non-steroidal anti-inflammatory activities in one

compound. Ligand obtained the rights to ensifentrine in 2018 in the acquisition of Vernalis. Our partner, Verona Pharma, recently completed the Phase 3 ENHANCE-21 and
ENHANCE-12 trials evaluating nebulized ensifentrine for the maintenance treatment of chronic obstructive pulmonary disease (COPD) and plans to file a NDA with the US FDA in
the first half of 2023. Under the terms of our agreement with Verona, we are entitled to development and regulatory milestones, including a £5.0 million payment upon the first
approval by any regulatory authority, and royalties on potential future sales.

SARM - VK5211 (Viking)

Viking is also developing VK5211, a novel SARM for patients recovering from hip-fracture. SARMs retain the beneficial properties of androgens without undesired side-

effects of steroids or other less selective androgens. In a Phase 2 clinical trial, VK5211 demonstrated statistically significant, dose dependent increases in lean body mass. Under the
terms of the agreement with Viking, we may be entitled to up to $270 million of development, regulatory and commercial milestones as well as tiered royalties on potential future
sales.

Ganaxalone IV (Marinus)

Our partner, Marinus, is conducting Phase 3 clinical trials with Captisol-enabled ganaxolone IV in patients with refractory status epilepticus. Marinus has exclusive worldwide

rights to Captisol-enabled ganaxolone, a GABA  receptor modulator, for use in humans. We are entitled to development and regulatory milestones, revenue from Captisol material
sales, and royalties on potential future sales.

A

Ciforadenant – CPI-444 (Corvus)

Our partner, Corvus, is conducting a Phase 1b/2 clinical trial evaluating ciforadenant as a potential first line therapy for metastatic renal cell cancer (RCC) in combination with
ipilimumab (anti-CTLA-4) and nivolumab (anti-PD-1). The Phase 1b/2 study is being conducted by the Kidney Cancer Research Consortium (KCRC) and is led by The University of
Texas MD Anderson Cancer Center. Under the terms of our agreement with Corvus, we are entitled to development and regulatory milestones and tiered royalties on potential future
sales. The aggregate potential milestone payments from Corvus are approximately $220 million for all indications.

FYCOMPA IV (Eisai)

Our partner, Eisai, is developing an intravenous Fycompa® (perampanel), formulated with Captisol, as a substitute in Japan for oral tablets as an adjunctive therapy in patients
with partial onset seizures (including secondarily generalized seizures) or primary generalized tonic-clonic seizures. In August of 2022, Eisai announced it had filed a supplementary
NDA in Japan for Fycompa IV seeking approval for the injection formulation as a new route of administration. We are entitled to revenue from Captisol material sales and tiered
royalties on potential future sales.

12

SB206 (Novan)

We acquired certain economic rights to berdazimer gel, 10.3% (SB206) from Novan in May 2019. Berdazimer gel is a topical nitric-oxide antiviral gel for the treatment of

viral skin infections, including molluscum contagiosum (MC). MC is an infection which causes skin lesions that affect approximately 6 million people in the United States annually,
with the greatest incidence in children aged one to 14 years. Under a development funding and royalties agreement with Novan for berdazimer gel, Ligand is entitled to receive up to
$20 million of milestone payments and tiered royalties of 7% to 10% on future worldwide sales of berdazimer gel.

PTX-022 (Palvella)

We acquired the economic rights to QTORIN™ 3.9% rapamycin anhydrous gel (QTORIN™ rapamycin, formerly PTX-022) from Palvella in December 2018. QTORIN™

rapamycin is a novel, topical formulation comprising high-strength rapamycin in development for the treatment of Pachyonychia Congenita (PC), treatment of Microcystic Lymphatic
Malformations (Microcystic LM), and for the prevention of Basal Cell Carcinomas (BCCs) in Gorlin Syndrome (GS). Palvella expects to report top-line results of the Phase 3
VAPAUS study in PC in mid-2023.

Lasofoxifene (Sermonix)

Lasofoxifene is a selective estrogen receptor modulator for osteoporosis treatment and other diseases, discovered through the research collaboration between Pfizer and us. Our

partner, Sermonix has a license for the development of oral lasofoxifene for the United States and additional territories and is currently developing lasofoxifene as a treatment for
ESR1-mutated metastatic breast cancer. Under the terms of the agreement, we are entitled to receive over $45 million in potential regulatory and commercial milestone payments as
well as royalties on potential future net sales.

Pradefovir (Xi'an Xintong)

Our Chinese licensee, Xi'an Xintong Medicine Research (following its acquisition of Chiva Pharmaceuticals), is developing pradefovir, an oral liver-targeting prodrug of the
HBV DNA polymerase/reverse transcriptase inhibitor adefovir, for the potential treatment of HBV infection. Pradefovir was developed using Ligand’s HepDirect technology. Xi'an
Xintong recently completed a Phase 3 HBV trial. We are entitled to an annual licensing maintenance fee and royalties on potential future sales.

MB07133 (Xi'an Xintong)

Chinese licensee Xi'an Xintong Medicine Research is also developing MB07133, a liver specific, HepDirect prodrug of cytarabine monophosphate, for the potential treatment
of hepatocellular carcinoma and intrahepatic cholangiocarcinoma. MB07133 is currently in Phase 1 in China. We are entitled to an annual licensing maintenance fee and royalties on
potential future sales.

CX2101A (China Resources Double-Crane Pharmaceutical)

In October of 2021, Ligand signed a collaboration agreement granting China Resources Double-Crane Pharmaceutical Co., Ltd. (CRDC) exclusive Asia territorial rights to
develop a novel investigational oral COVID-19 antiviral therapeutic compound using Ligand’s BEPro technology. Ligand received an upfront payment in respect of the collaboration,
and clinical and regulatory milestone payments, and tiered royalties on net sales. CRDC will be responsible for all costs related to the program. BEPro is a proprietary prodrug
technology that is specifically applicable to nucleotides and nucleotide analogs for the development of compounds with improved product profiles. In December of 2022, CRDC
announced that the IND for CX2101A received a "Notice of Drug Clinical Trial Approval" issued by the State Drug Administration (NMPA), approving clinical trials of the drug for
the treatment of novel coronavirus pneumonia in China. CX2101A is a small molecule compound that acts on RdRp (RNA-dependent RNA polymerase) of SARS-CoV-2, using the
BEPro prodrug technology. CRDC is conducting a Phase 1 trial in China.

ONS-5010 (Outlook Therapeutics)

Outlook Therapeutics announced in October of 2022 that the US FDA has accepted for filing a BLA for ONS-5010 / LYTENAVA™ (bevacizumab-vikg), an investigational

ophthalmic formulation of bevacizumab for the treatment of wet age-related macular degeneration (wet AMD). Outlook uses the Selexis technology platform for ONS-5010. The FDA
set a PDUFA goal date of August 29, 2023 for the BLA. ONS-5010, if approved, is expected to receive 12 years of regulatory exclusivity in the United States. In December of 2022,
Outlook announced the validation of its MAA by the EMA for ONS-5010. The decision for potential approval is expected from the European Commission in early 2024. We are
entitled to earn royalties on sales of ONS-5010 by Outlook.

Milestone Payments

13

Our programs under license with our partners may generate milestone payments to us if our partners reach certain development, regulatory and commercial milestones. The

following table represents the maximum value of our milestone payment pipeline by technology, development stage and partner (in thousands):

Technology*

Stage*

Partner*

Pelican
Captisol
LTP/Hep Direct/BEPro
NCE/Other
Total

>$215,000
> $170,000
> $310,000
> $1,850,000
>$2,500,000

Preclinical
Clinical
Regulatory
Commercial
Total

*All tables exclude any annual access fees and collaboration revenue for development work.

Summary of selected programs available for license

> $1,000
> $120,000
> $1,200,000
> $1,250,000
>$2,500,000

Viking
Jazz
Seelos
Travere
Other
Total

$1,500,000
$150,000
$100,000
$70,000
>$750,000
>$2,500,000

We have a number of unpartnered programs focused on a wide-range of potential indications or disease eligible for further development or licensing:

Program
CE-Iohexol
Luminespib/Hsp90 Inhibitor
CE-Sertraline, Oral Concentrate
PF530 Interferon Beta
PF582 Ranibizumab
CCR1 Antagonist
CE-Busulfan
CE-Cetirizine Injection
CE-Silymarin for Topical formulation
FLT3 Kinase Inhibitors
GCSF Receptor Agonist
PF529 Pegfilgrastim
PF810 Recombinant Peptide

Development Stage
Phase 2
Phase 2
Phase 1
Phase 1
Phase 1
Preclinical
Preclinical
Preclinical
Preclinical
Preclinical
Preclinical
Preclinical
Preclinical

Targeted Indication or Disease
Diagnostics
Oncology
Depression
Immunomodulatory
Ocular
Oncology
Oncology
Allergy
Sun damage
Oncology
Blood disorders
Oncology
Endocrine System

Manufacturing

We contract with a third party manufacturer, Hovione, for Captisol production. Hovione operates FDA-inspected sites in the United States, Macau, Ireland and Portugal.
Manufacturing operations for Captisol are performed primarily at Hovione's Portugal and Ireland facilities. We believe we maintain adequate inventory of Captisol to meet our current
partner needs and that our Captisol capacity will be sufficient to meet future partner needs.

In the event of a Captisol supply interruption, we are permitted to designate and, with Hovione’s assistance, qualify one or more alternate suppliers. If the supply interruption

continues beyond a designated period, we may terminate the agreement. In addition, if Hovione cannot supply our requirements of Captisol due to an uncured force majeure event, we
may also obtain Captisol from a third party and have previously identified such parties.

The current term of the agreement with Hovione is through December 2024. The agreement will automatically renew for successive two year renewal terms unless either party
gives written notice of its intention to terminate the agreement no less than two years prior to the expiration of the initial term or renewal term. In addition, either party may terminate
the agreement for the uncured material breach or bankruptcy of the other party or an extended force majeure event. We may terminate the agreement for extended supply interruption,
regulatory action related to Captisol or other specified events. We have ongoing minimum purchase commitments under the agreement.

14

Competition

Some of the drugs we and our licensees and partners are developing may compete with existing therapies or other drugs in development by other companies. Furthermore,

academic institutions, government agencies and other public and private organizations conducting research may seek patent protection with respect to potentially competing products
or technologies and may establish collaborative arrangements with our competitors.

Our Captisol business may face competition from other suppliers of similar cyclodextrin excipients or other technologies that are aimed to increase solubility or stability of

APIs.

Our competitive position also depends upon our ability to obtain patent protection or otherwise develop proprietary products or processes. For a discussion of the risks

associated with competition, see below under “Item 1A. Risk Factors.”

Environmental, Health and Safety (EHS)

We are committed to providing a safe and healthy workplace, promoting environmental excellence in our communities, and complying with all relevant regulations and
industry standards. We establish and monitor programs to reduce pollution, prevent injuries, and maintain compliance with applicable regulations. By focusing on such practices, we
believe we can affect a meaningful, positive change in our community and maintain a healthy and safe environment. During 2022, we made good progress on our ESG efforts. We
have initiated a $2.5 million solar investment at Kansas University Innovation Park; modified the Captisol manufacturing process resulting in water savings and packaging reduction;
made ESG related charitable donations; and commenced numerous initiatives from our ESG-focused outreach committees. We expect to continue our effort and to refine our EHS
policies and practices in 2023. More information on our EHS policies and initiatives is available on our website at www.ligand.com. The information contained on our website is not
intended to be part of this filing.

Government Regulation

The research and development, manufacturing and marketing of pharmaceutical products are subject to regulation by numerous governmental authorities in the United States

and other countries. We and our partners, depending on specific activities performed, are subject to these regulations. In the United States, pharmaceuticals are subject to regulation by
both federal and various state authorities, including the FDA. The Federal Food, Drug and Cosmetic Act and the Public Health Service Act govern the testing, manufacture, safety,
efficacy, labeling, storage, record keeping, approval, advertising and promotion of pharmaceutical products. These activities are subject to additional regulations that apply at the state
level. There are similar regulations in other countries as well. For both currently marketed products and products in development, failure to comply with applicable regulatory
requirements can, among other things, result in delays, the suspension of regulatory approvals, as well as possible civil and criminal sanctions. In addition, changes in existing
regulations could have a material adverse effect on us or our partners. For a discussion of the risks associated with government regulations, see below under “Item 1A. Risk Factors.”

Patents and Proprietary Rights

We believe that patents and other proprietary rights are important to our business. Our policy is to file patent applications to protect technology, inventions and improvements

to our inventions that are considered important to the development of our business. We also rely upon trade secrets, know-how, continuing technological innovations and licensing
opportunities to develop and maintain our competitive position.

Patents are issued or pending for the following key products or product families. The scope and type of patent protection provided by each patent family is defined by the

claims in the various patents. Patent term may vary by jurisdiction and depend on a number of factors including potential patent term adjustments, patent term extensions, and
terminal disclaimers. For each product or product family, the patents and/or applications referred to are in force in at least the United States, and for most products and product
families, the patents and/or applications are also in force in European jurisdictions, Japan and other jurisdictions.

Captisol

Patents and pending patent applications covering Captisol and methods of making Captisol are owned by us. The patents covering the Captisol product with the latest

expiration date is set to be in 2033 (see, e.g., U.S. Patent No. 9,493,582 (expires Feb. 27, 2033)). Other patent applications covering methods of making Captisol, if issued, potentially
have terms to 2041. We have asserted U.S. Patents 8,410,077, 9,200,088, and 9,493,582 against Teva in connection with their attempt to obtain FDA approval to manufacture and sell
a generic version of Evomela . We also own several patents and pending patent applications covering drug products containing Captisol as a component. Globally, we own
approximately 390 issued patents covering all of the foregoing Captisol compositions, methods and related technology.

®

Ten Captisol patents in several families are listed in the Orange Book in connection with one or more prescription drugs currently on the market. These Captisol-enabled drugs

include Nexterone (Baxter), Kyprolis (Amgen), Noxafil (Merck),

15

Evomela (Acrotech/CASI), Baxdela (Melinta) and Zulresso (Sage). These patents are listed in the table below, and each patent family containing these patents has pending and/or
granted counterparts in Europe, China and Japan.

Country

United States
United States
United States
United States
United States

United States
United States
United States

Patent No.
7635773
8410077
9200088
10117951
9750822

9493582
10040872
10864183

United States

10940128

United States

11020363

Orange Book-listed Captisol Patents

Title

Sulfoalkyl Ether Cyclodextrin Compositions
Sulfoalkyl Ether Cyclodextrin Compositions
Sulfoalkyl Ether Cyclodextrin Compositions
Sulfoalkyl Ether Cyclodextrin Compositions
Sulfoalkyl Ether Cyclodextrin Compositions

Alkylated Cyclodextrin Compositions And Processes For Preparing And Using The Same
Alkylated Cyclodextrin Compositions And Processes For Preparing And Using The Same
Injectable Nitrogen Mustard Compositions Comprising A Cyclodextrin Derivative And Methods Of
Making And Using The Same
Injectable Melphalan Compositions Comprising A Cyclodextrin Derivative And Methods Of Making And
Using The Same
Injectable Nitrogen Mustard Compositions Comprising A Cyclodextrin Derivative And Methods Of
Making And Using The Same

 ‡
Expiration (nominal)
03/13/2029
03/13/2029
03/13/2029
03/13/2029
03/13/2029

2/27/2033
10/21/2033
5/28/2030

5/28/2030

5/28/2030

‡

 Expiration dates are calculated as 20 years from the earliest nonprovisional filing date to which priority is claimed, and do not take into account disclaimers or extensions that are or may be available in these
jurisdictions.

Subject to compliance with the terms of the respective agreements, our rights to receive royalty payments under our licenses with our exclusive licensors typically extend for

the life of the patents covering such developments. For a discussion of the risks associated with patent and proprietary rights, see below under “Item 1A. Risk Factors.”

Kyprolis

Patents protecting Kyprolis include those owned by Amgen and those owned by us. The United States patent listed in the Orange Book relating to Kyprolis owned by Amgen

with the latest expiration date is not expected to expire until 2029. Patents and applications owned by Ligand relating to the Captisol component of Kyprolis are not expected to expire
until 2033. Amgen filed suit against several generic drug companies over their applications to make generic versions of Kyprolis. Several generics have settled with Amgen on
confidential terms. However, it has been publicly reported that the U.S. launch date for at least Breckenridge Pharmaceuticals’ generic product will be on a date that is held as
confidential in 2027 or sooner, depending on certain occurrences. One generic company, Cipla Limited/Cipla USA, Inc. chose not to settle the litigation with Amgen, and proceeded to
trial. The District Court upheld the validity of patent claims from three of the patents and the judgment was upheld on appeal.

Ligand UK Development Limited

Under the terms of our sale of Vernalis (R&D) Limited to HitGen in December 2020, Ligand retained a portfolio of fully-funded shots on goal, which now include S65487, a
Bcl-2 inhibitor, and S64315, an Mcl-1 inhibitor for treatment of cancers, both of which are partnered with Servier in collaboration with Novartis and VER250840 (an oral, selective
Chk1 inhibitor for treatment of cancer). These programs and their IP are now owned by Ligand UK Development Limited, which has a worldwide patent portfolio of over 200 granted
patents in over 70 countries. This patent portfolio is mature, with expected expiry dates between 2022 and 2033.

Pelican Expression Technology Platform

We acquired the Pelican Expression Technology platform through acquisition of Pfenex Inc. in October 2020. This acquisition brought a robust portfolio of patents and patent

applications along with substantial know-how and trade secrets which protect various aspects of our core Pelican Expression Technology business. As of December 31, 2022, we were
the sole owner of a patent portfolio that consisted of over 200 patents and 40 pending patent applications worldwide that provide material coverage for our platform technology,
licensed products and product candidates. Our U.S. issued patents expire during the time period beginning in 2025 and ending in 2038. Our owned and exclusively licensed patent
portfolio includes claims directed to methods for recombinant protein production and methods for rapid screening of an array of expression systems, tools for protein expression such
as P. fluorescens promoters, secretion leaders, plasmid maintenance systems, improved methods for non-standard amino acid incorporation and fusion partners for peptide production.
In addition, our IP covers

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methods for producing certain classes of proteins such as cytokines, growth factors and antibody derivatives, as well as expression strains and methods for production, purification
and formulation of certain vaccine antigens, peptides, therapeutic enzymes, human cytokines, etc.

Human Capital Management

We recognize and take care of our employees by offering a wide range of competitive pay, recognition, and benefit programs. We are proud to provide our employees the
opportunity to grow and advance as we invest in their education and career development. As of December 31, 2022, we have 76 employees, of whom 49 are involved directly in
scientific research and development activities.

We rely on skilled, experienced, and innovative employees to conduct the operations of our company. Our key human capital objectives include identifying, recruiting,

retaining, incentivizing and integrating our existing and new employees. We frequently benchmark our compensation practices and benefits programs against those of comparable
industries and in the geographic areas where our facilities are located. We believe that our compensation and employee benefits are competitive and allow us to attract and retain
skilled labor throughout our organization. Our notable health, welfare and retirement benefits include:

•

•

•

•

•

equity awards through our 2002 Stock Incentive Plan;

subsidized health insurance;

401(k) Plan with matching contributions;

tuition assistance program; and

paid time off.

We value diversity at all levels and continue to focus on extending our diversity and inclusion initiatives across our workforce. As of December 31, 2022, approximately 26%

and 14% of our workforce are Asian and Hispanic, respectively. We believe that our business benefits from the different perspectives a diverse workforce brings.

We strive to maintain an inclusive environment free from discrimination of any kind, including sexual or other discriminatory harassment. Our employees have multiple

avenues available through which inappropriate behavior can be reported, including a confidential hotline. All reports of inappropriate behavior are promptly investigated with
appropriate action taken to stop such behavior.

Investor Information

Financial and other information about us is available on our website at www.ligand.com. We make available on our website, without charge, copies of our Annual Report on
Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange
Act as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. You may obtain copies of these documents by visiting the SEC’s
website at www.sec.gov. In addition, we use Twitter (@Ligand_LGND) and our investor relations website as a means of disclosing material non-public information and for
complying with our disclosure obligations under Regulation FD. Investors should monitor our Twitter account and our website, in addition to following our press releases, SEC
filings, public conference calls and webcasts. These website addresses and the information accessible through our Twitter account are not intended to function as hyperlinks, and the
information contained in our website and in the SEC’s website is not intended to be a part of this filing.

ITEM 1A.

RISK FACTORS

The following is a summary description of some of the many risks we face in our business. You should carefully review these risks in evaluating our business, including the

businesses of our subsidiaries. You should also consider the other information described in this report. Additional risks not presently known to us or that we currently deem
immaterial also may impair our business.

Summary of Risks Related to our Business:

Our business is subject to numerous risks and uncertainties, including those described below. The principal risks and uncertainties affecting our business include, but are not

limited to the following:

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•

•

Future revenue based on Kyprolis, Evomela, Teriparatide and Rylaze as well as royalties from our other partnered products, may be lower than expected;

Future revenue from sales of Captisol material to our license partners may be lower than expected;

• We rely heavily on collaboration relationships to generate milestone and royalty payments and our collaboration partners have significant discretion when deciding whether to
pursue any development program, and any failure by our partners to successfully develop a product candidate or a termination or breach of any of the related agreements, or a
change in their strategy or the focus of their development and commercialization efforts with respect to our partnered programs, could reduce our milestone and license fee
revenue, and potentially reduce future royalties;

•

•

Our product candidates, and the product candidates of our partners, face significant development and regulatory hurdles prior to partnering and/or marketing which could delay
or prevent licensing, sales-based royalties and/or milestone revenue;

Third party intellectual property may prevent us or our partners from developing our potential products; our and our partners’ intellectual property may not prevent
competition; and any intellectual property issues may be expensive and time consuming to resolve;

• Market acceptance and sales of any approved product will depend significantly on the availability and adequacy of coverage and reimbursement from third-party payors and

may be affected by existing and future healthcare reform measures; and

•

Our operating results may fluctuate significantly, which makes our future operating results difficult to predict and could cause our operating results to fall below expectations
or any guidance we may provide.

Risks Related to Our Business Operations and Reliance on Third Parties:

Future revenue based on Kyprolis, Evomela, Teriparatide and Rylaze as well as royalties from our other partnered products, may be lower than expected.

A significant portion of our royalty revenue is based on sales of Kyprolis by Amgen, sales of Evomela by Acrotech Biopharma, sales of Teriparatide by Alvogen/Adalvo and
sales of Rylaze by Jazz. Royalties, including payments from the foregoing partners, are expected to be a substantial portion of our ongoing revenues for the foreseeable future. Any
setback that may occur with respect to any of our partners' products, and in particular Kyprolis, could significantly impair our operating results and/or reduce our revenue and the
market price of our stock. Setbacks for the products could include problems with shipping, distribution, manufacturing, product safety, marketing, government regulation or
reimbursement, licenses and approvals, intellectual property rights, including failure by any of the foregoing partners to enforce their respective intellectual property rights,
competition with existing or new products and physician or patient acceptance of the products, as well as higher than expected total rebates, returns, discounts, or unfavorable
exchange rates. These products also are or may become subject to generic competition. For example, we entered into a settlement agreement with Teva and Acrotech Biopharma (the
holder of the NDA for Evomela) which will allow Teva to market a generic version of Evomela in the United States on June 1, 2026, or earlier under certain circumstances. The entry
of generic competition for Evomela may materially and adversely affect the revenue we derive from Evomela sales. Also, Amgen has settled patent litigation related to Kyprolis on
confidential terms with several parties, but it has been publicly reported that the U.S. launch date for at least Breckenridge Pharmaceuticals’ applicable generic product will be “on a
date that is held as confidential in 2027 or sooner, depending on certain occurrences.”

Future revenue from sales of Captisol material to our license partners may be lower than expected.

Revenues from sales of Captisol material to our collaborative partners, including Amgen and Gilead, represent a significant portion of our current revenues. Any setback that

may occur with respect to Captisol could significantly impair our operating results and/or reduce the market price of our stock. Setbacks for Captisol could include problems with
shipping, distribution, manufacturing, product safety, marketing, government regulation or reimbursement, licenses and approvals, intellectual property rights, competition with
existing or new products and physician or patient acceptance of the products using Captisol. In addition, revenue from Captisol sales related to remdesivir may continue to decrease
due to a number of factors, including alternative treatments for COVID-19 that have been or will be developed by other companies and the decrease in COVID-19 infections, in which
case the commercial opportunity could be materially and adversely affected.

If products or product candidates incorporating Captisol material were to cause any unexpected adverse events, the perception of Captisol safety could be seriously harmed. If
this were to occur, we may not be able to sell Captisol unless and until we are able to demonstrate that the adverse event was unrelated to Captisol, which we may not be able to do.
Further, the FDA could require us to submit additional information for regulatory review or approval, including data from extensive safety

18

testing or clinical testing of products using Captisol. This would be expensive and it may delay the marketing of Captisol-enabled products and receipt of revenue related to those
products, which could significantly impair our operating results and/or reduce the market price of our stock.

We obtain Captisol from Hovione, our third party manufacturer, primarily at their facilities in Ireland and Portugal. If Hovione were to cease to be able, for any reason, to

supply Captisol to us in the amounts we require, or decline to supply Captisol to us, we would be required to seek an alternative source, which could potentially take a considerable
length of time and impact our revenue and customer relationships. In the event of a Captisol supply interruption, we are permitted to designate and, with Hovione’s assistance, qualify
one or more alternate suppliers, although there is no assurance that we could do so timely or at acceptable costs, if at all. In addition to manufacturing at Hovione’s facilities in Ireland
and Portugal, we have processing capacity for Captisol in both the United States and England.

We maintain inventory of Captisol, which has a five-year shelf life, at three geographically dispersed storage locations in the United States and Europe. If we were to encounter

problems maintaining our inventory, such as natural disasters, at one or more of these locations, it could lead to supply interruptions. In addition, we rely on Hovione to expand
manufacturing capacity of Captisol and any failure by Hovione to timely implement such increased capacity could adversely affect our ability to supply Captisol to our partners.
While we believe we maintain adequate inventory of Captisol to meet our current partner needs, and our Captisol capacity will be sufficient to meet future partner needs, our
estimates and projections for Captisol demand may not be correct and any supply interruptions could materially adversely impact our operating results.

We currently depend on our arrangements with our partners and licensees to sell products using our Captisol technology. These agreements generally provide that our partners

may terminate the agreements at will. If our partners discontinue sales of products using Captisol, fail to obtain regulatory approval for products using Captisol, fail to satisfy their
obligations under their agreements with us, choose to utilize a competing product, or if we are unable to establish new licensing and marketing relationships, our financial results and
growth prospects would be materially affected.

Further, under most of our Captisol outlicenses, the amount of royalties we receive will be reduced or will cease when the relevant patent expires. Our low-chloride patents and

foreign equivalents are not expected to expire until 2033, our high purity patents and foreign equivalents, are not expected to expire until 2029 and our morphology patents and
foreign equivalents are not expected to expire until 2026 in the United States, but the initially filed patents relating to Captisol expired starting in 2010 in the United States and in 2016
in most countries outside the United States. If our other intellectual property rights are not sufficient to prevent a generic form of Captisol from coming to market and if in such case
our partners choose to terminate their agreements with us, our Captisol revenue may decrease significantly.

We rely heavily on collaboration relationships to generate milestone and royalty payments and our collaboration partners have significant discretion when deciding whether to
pursue any development program, and any failure by our partners to successfully develop a product candidate or a termination or breach of any of the related agreements could
reduce our milestone and license fee revenue, and potentially reduce future royalties.

Our strategy for developing and commercializing many of our product candidates includes entering into collaboration agreements, outlicenses, and development funding and
royalty purchase agreements with corporate partners and others. These agreements give our collaboration partners significant discretion when deciding whether or not to pursue any
development program. Our existing collaborations may not continue or be successful, and we may be unable to enter into future collaboration arrangements to develop and
commercialize our unpartnered assets.

In addition, our collaborators may develop products, either alone or with others that compete with the types of products they are developing with us (or that we are developing

on our own). This would result in increased competition for our or our partners' programs. If product candidates are approved for marketing under our collaboration programs,
revenues we receive will depend on the manufacturing, marketing and sales efforts of our collaboration partners, who generally retain commercialization rights under the
collaboration agreements. Generally, our current collaboration partners also have the right to terminate their collaborations at will or under specified circumstances. If any of our
collaboration partners breach (for example, by not making required payments when due, or at all) or terminate their agreements with us or otherwise fail to conduct their collaboration
activities successfully, including due to insolvency events, ongoing product development under these agreements will be delayed or terminated. Disputes or litigation may also arise
with our collaborators (with us and/or with one or more third parties), including those over ownership rights to intellectual property, know-how or technologies developed with our
collaborators. Such disputes or litigation could adversely affect our rights to one or more of our product candidates. Any such dispute or litigation could delay, interrupt or terminate
the collaboration research, development and commercialization of certain potential products, create uncertainty as to ownership rights of intellectual property, or could result in
litigation or arbitration. The occurrence of any of these problems could be time-consuming and expensive and could adversely affect our business.

19

Our collaboration partners may change their strategy or the focus of their development and commercialization efforts with respect to our partnered programs, and the success of
our partnered programs could be adversely affected.

If our collaboration partners terminate their collaborations with us or do not commit sufficient resources to the development, manufacture, marketing or distribution of our
partnered programs, we could be required to devote additional resources to our partnered programs, seek new collaboration partners or abandon such partnered programs, all of which
could reduce our revenues and otherwise have an adverse effect on our business.

In addition, biopharmaceutical development is inherently uncertain and very few therapeutic candidates ultimately progress through clinical development and receive approval

for commercialization. If our partners do not receive regulatory approval for a sufficient number of therapeutic candidates originating from our partnerships, we may not be able to
sustain our business model.

Our product candidates, and the product candidates of our partners, face significant development and regulatory hurdles prior to partnering and/or marketing which could delay
or prevent licensing, sales-based royalties and/or milestone revenue.

Before we or our partners obtain the approvals necessary to sell any of our unpartnered assets or partnered programs, we must show through preclinical studies and human
testing that each potential product is safe and effective. We and/or our partners have a number of partnered programs and unpartnered assets moving toward or currently awaiting
regulatory action. Failure to show any product's safety and effectiveness could delay or prevent regulatory approval of a product and could adversely affect our business. The product
development and clinical trials process is complex and uncertain. For example, the results of preclinical studies and initial clinical trials may not necessarily predict the results from
later large-scale clinical trials. In addition, clinical trials may not demonstrate a product's safety and effectiveness to the satisfaction of the regulatory authorities. A number of
companies have suffered significant setbacks in advanced clinical trials or in seeking regulatory approvals, despite promising results in earlier trials. The FDA may also require
additional clinical trials after regulatory approvals are received. Such additional trials may be expensive and time-consuming, and failure to successfully conduct those trials could
jeopardize continued commercialization of a product.

The speed at which we and our partners complete our scientific studies and clinical trials depends on many factors, including, but not limited to, the ability to obtain adequate
supplies of the products to be tested and patient enrollment. Patient enrollment is a function of many factors, including the size of the patient population, the proximity of patients to
clinical sites, the eligibility criteria for the trial and other potential drug candidates being studied. Delays in patient enrollment for our or our partners’ trials may result in increased
costs and longer development times. In addition, our partners have rights to control product development and clinical programs for products developed under our collaborations. As a
result, these partners may conduct these programs more slowly or in a different manner than expected. Moreover, even if clinical trials are completed, we or our partners still may not
apply for FDA or foreign regulatory approval in a timely manner or the FDA or foreign regulatory authority still may not grant approval.

Our product candidate discovery, early-stage development, and product reformulation programs may require substantial additional capital to complete successfully. Our

partners’ development programs may require substantial additional capital to complete successfully, arising from costs to: conduct research, preclinical testing and human studies;
establish pilot scale and commercial scale manufacturing processes and facilities; and establish and develop quality control, regulatory, marketing, sales and administrative capabilities
to support these programs. While we expect to fund our research and development activities from cash generated from operations to the extent possible, if we are unable to do so, we
may need to complete additional equity or debt financings or seek other external means of financing. These financings could depress our stock price. If additional funds are required to
support our operations and we are unable to obtain them on terms favorable to us, we may be required to cease or reduce further development or commercialization of our products, to
sell some or all of our technology or assets or to merge with another entity.

If the Distribution, together with certain related transactions, fails to qualify as a reorganization under Sections 355 and 368(a)(1)(D) of the Internal Revenue Code of 1986, as
amended (the “Code”), or the Merger fails to qualify as a reorganization under Section 368(a) of the Code, we could incur significant tax liabilities.

The Distribution and the Merger were conditioned upon receipt of a tax opinion from outside counsel to the effect that the Distribution would qualify as a reorganization under

Sections 355 and 368(a)(1)(D) of the Code, that the Merger would not cause Section 355(e) of the Code to apply to the Distribution and that the Merger would be treated as a
reorganization under Section 368(a) of the Code. The opinion was delivered in connection with the closing of the Merger and was based on, among other things, certain facts,
assumptions, representations and undertakings from us, OmniAb and New OmniAb, including those regarding the past and future conduct of the companies’ respective businesses and
other matters. If any of these facts, assumptions, representations, or undertakings were incorrect or not satisfied, we may not be able to rely on the opinion, and we and our
stockholders could be subject to significant U.S. federal income tax liabilities. In addition, the opinion is not binding on the IRS or the courts, and notwithstanding the opinion, the IRS
could determine on audit that the Distribution or Merger does not qualify as a reorganization if it determines that any of the facts, assumptions, representations or undertakings on
which the

20

opinion is based are not correct or have been violated or that the Distribution or Merger should be taxable for other reasons, including as a result of a significant change in stock or
asset ownership after the Distribution. If the Distribution, together with certain related transactions, is ultimately determined not to qualify as a reorganization, or the Merger is
ultimately determined not to qualify as a reorganization, we and our stockholders that are subject to U.S. federal income tax could incur significant U.S. federal income tax liabilities.

The anticipated benefits of the Separation and Merger may not be achieved.

We may not be able to achieve the full strategic and financial benefits expected to result from the Separation and Merger, including the potential that the Separation and Merger

will:

•
•
•
•

•

•

allow each business to pursue its own operational and strategic priorities and more quickly respond to trends, developments and opportunities in its respective markets;
create two separate and distinct management teams focused on each business’s unique strategic priorities, target markets and corporate development opportunities;
give each business opportunity and flexibility by pursuing its own investment, capital allocation and growth strategies consistent with its long-term objectives;
allow investors to separately value each business based on the unique merits, performance and future prospects of each business, providing investors with two distinct
investment opportunities;
enhance the ability of each business to attract and retain qualified management and to better align incentive-based compensation with the performance of each separate
business; and
give each of New OmniAb and Ligand its own equity currency for use in connection with acquisitions.

We may not achieve the anticipated benefits of the Separation and Merger for a variety of reasons. Further, such benefits, if ultimately achieved, may be delayed. In addition,

the Separation and Merger could materially and adversely affect our business, financial condition and results of operations.

The Separation and Distribution may expose Ligand to potential liabilities arising out of state and federal fraudulent conveyance laws and legal dividend requirements.

The Separation and Distribution are subject to review under various state and federal fraudulent conveyance laws. Fraudulent conveyance laws generally provide that an entity
engages in a constructive fraudulent conveyance when (i) the entity transfers assets and does not receive fair consideration or reasonably equivalent value in return; and (ii) the entity:
(a) is insolvent at the time of the transfer or is rendered insolvent by the transfer; (b) has unreasonably small capital with which to carry on its business; or (c) intends to incur or
believes it will incur debts beyond its ability to repay its debts as they mature. An unpaid creditor or an entity acting on behalf of a creditor (including without limitation a trustee or
debtor-in-possession in a bankruptcy by New OmniAb or Ligand or any of their respective subsidiaries) may bring an action alleging that the Separation or Distribution or any of the
related transactions constituted a constructive fraudulent conveyance. If a court accepts these allegations, it could impose a number of remedies, including without limitation, voiding
New OmniAb’s claims against Ligand, requiring New OmniAb stockholders to return to Ligand some or all of the shares of New OmniAb common stock issued via the Distribution
and Merger, or providing Ligand with a claim for money damages against New OmniAb in an amount equal to the difference between the consideration received by Ligand and
OmniAb’s fair market value at the time of the Distribution.

The measure of insolvency for purposes of the fraudulent conveyance laws will vary depending on which jurisdiction’s law is applied. Generally, an entity would be
considered insolvent if (i) the present fair saleable value of its assets is less than the amount of its liabilities (including contingent liabilities); (ii) the present fair saleable value of its
assets is less than its probable liabilities on its debts as such debts become absolute and matured; (iii) it cannot pay its debts and other liabilities (including contingent liabilities and
other commitments) as they mature; or (iv) it has unreasonably small capital for the business in which it is engaged. We cannot assure you what standard a court would apply to
determine insolvency or that a court would determine that New OmniAb or Ligand or any of their subsidiaries were solvent at the time of or after giving effect to the Distribution.

The Distribution of OmniAb common stock is also subject to review under state corporate distribution statutes. Under the DGCL, a corporation may only pay dividends to its

stockholders either (i) out of its surplus (net assets minus capital) or (ii) if there is no such surplus, out of its net profits for the fiscal year in which the dividend is declared or the
preceding fiscal year. Although Ligand intended to make the Distribution of OmniAb common stock entirely from surplus, we cannot assure you that a court will not later determine
that some or all of the Distribution to Ligand stockholders was unlawful.

The Separation and the retirement of our CEO resulted in substantial changes in our Board of Directors and management.

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The Separation resulted in substantial changes in our Board of Directors and management. In particular, Matthew Foehr, our former President and Chief Operating Officer, and
Charles Berkman, our former Senior Vice President, General Counsel and Secretary, resigned from their positions with us upon the completion of the Separation to join management
positions with New OmniAb. In connection with the Separation and the departure of the foregoing officers, Ligand appointed new officers. Matthew Korenberg, our former Executive
Vice President, Finance and Chief Financial Officer, was appointed our President and Chief Operating Officer. Octavio Espinoza, our former Senior Vice President, Finance, was
appointed our Chief Financial Officer. Andrew Reardon, our former Vice President, Special Counsel, was appointed Chief Legal Officer and Secretary. Furthermore, Sarah Boyce,
Jennifer Cochran and Sunil Patel resigned as members of our Board of Directors in connection with the Separation to join the board of directors of New OmniAb. In addition, on
December 5, 2022, John Higgins retired as our Chief Executive Officer and Todd Davis was appointed to that position. Mr. Higgins also resigned as a member of our Board of
Directors effective December 31, 2022. These senior officer and board level changes could be disruptive to our operations, present significant management challenges and could
harm our business.

Risks Related to Intellectual Property:

Third party intellectual property may prevent us or our partners from developing our potential products; our and our partners’ intellectual property may not prevent competition;
and any intellectual property issues may be expensive and time consuming to resolve.

The manufacture, use or sale of our potential products or our licensees' products or potential products may infringe the patent rights of others. If others obtain patents with
conflicting claims, we may be required to obtain licenses to those patents or to develop or obtain alternative technology. We may not be able to obtain any such licenses on acceptable
terms, or at all. Any failure to obtain such licenses could delay or prevent us from pursuing the development or commercialization of our potential products, platform and technology.

Generally, our success will depend on our ability and the ability of our partners to obtain and maintain patents and other intellectual property rights for our and their potential

products and technologies. Our patent position is uncertain and involves complex legal and technical questions for which legal principles are unresolved. Even if we or our partners do
obtain patents, such patents may not adequately protect the technology we own or have licensed. 

We permit our partners to list our patents that cover their branded products in the Orange Book. If a third party submits a new drug application (NDA) or abbreviated new drug
application (ANDA) for a generic drug product that relies in whole or in part on studies contained in our partner’s NDA for their branded product, the third party will have the option
to certify to the FDA that, in the opinion of that third party, the patents listed in the Orange Book for our partner’s branded product are invalid, unenforceable, or will not be infringed
by the manufacture, use or sale of the third party’s generic drug product. A third party certification that a new product will not infringe Orange Book-listed patents, or that such patents
are invalid, is called a paragraph IV patent certification. If the third party submits a paragraph IV patent certification to the FDA, a notice of the paragraph IV patent certification must
be sent to the NDA owner and the owner of the patents that are subject to the paragraph IV patent certification notice once the third-party’s NDA or ANDA is accepted for filing by
the FDA. A lawsuit may then be initiated to defend the patents identified in the notice. The filing of a patent infringement lawsuit within 45 days of the receipt of notice of a paragraph
IV patent certification automatically prevents the FDA from approving the generic NDA or ANDA until the earlier of the expiration of a 30-month period, the expiration of the
patents, the entry of a settlement order stating that the patents are invalid or not infringed, a decision in the infringement case that is favorable to the NDA or ANDA applicant, or such
shorter or longer period as the court may order. If a patent infringement lawsuit is not initiated within the required 45-day period, the third-party’s NDA or ANDA will not be subject
to the 30-month stay.

Several third-parties have challenged, and additional third parties may challenge, the patents covering our partner’s branded products, including Kyprolis and Evomela, which
could result in the invalidation or unenforceability of some or all of the relevant patent claims. We may from time to time become party to litigation or other proceedings as a result of
Paragraph IV certifications. For example, as a result of the settlement of one such matter, Teva will be permitted to market a generic version of Evomela  in the United States on June
1, 2026 or earlier under certain circumstances. The terms of the settlement agreement are otherwise confidential. Also, as noted above, Amgen has settled patent litigation related to
Kyprolis on confidential terms with several parties, but it has been publicly reported that the U.S. launch date for at least Breckenridge Pharmaceuticals’ applicable generic product
will be “on a date that is held as confidential in 2027 or sooner, depending on certain occurrences.”

®

In addition, we cannot assure you that all of the potentially relevant prior art information that was or is deemed available to a person of skill in the relevant art prior to the

priority date of the claimed invention-relating to our and our partners’ patents and patent applications has been found. If such prior art exists, it can invalidate a patent or prevent a
patent from issuing from a pending patent application, and we or our partners may be subject to a third party pre-issuance submission of prior art to the USPTO. Even if our patent
applications do successfully issue and even if such patents cover our or our partner’s products or

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potential products, third parties may initiate litigation or opposition, interference, re-examination, post-grant review, inter partes review, nullification or derivation action in court or
before patent offices, or similar proceedings challenging the validity, enforceability or scope of such patents, which may result in the patent claims being narrowed or invalidated, may
allow third parties to commercialize our or our partners’ products and compete directly with us and our partners, without payment to us or our partners, or limit the duration of the
patent protection of our and our partners’ technology and products.

In addition, similar to what other companies in our industry have experienced, we expect our competitors and others may have patents or may in the future obtain patents and

claim that making, having made, using, selling, offering to sell or importing our technologies infringes these patents. Defense of infringement and other claims, regardless of their
merit, would involve substantial litigation expense and would be a substantial diversion of management and employee resources from our business. Parties making claims against us
may be able to sustain the costs of complex patent litigation more effectively than we can because they have substantially greater resources. Parties making claims against us may be
able to obtain injunctive or other relief, which could block our ability to develop, commercialize and sell products or services and could result in the award of substantial damages
against us, including treble damages, attorney’s fees, costs and expenses if we are found to have willfully infringed. In the event of a successful claim of infringement against us, we
may be required to pay damages and ongoing royalties and obtain one or more licenses from third parties, or be prohibited from selling certain products or services. As discussed
above, we may not be able to obtain these licenses on acceptable or commercially reasonable terms, if at all, or these licenses may be non-exclusive, which could result in our
competitors gaining access to the same intellectual property. In addition, we could encounter delays in product or service introductions while we attempt to develop alternative
products or services to avoid infringing third-party patents or proprietary rights. Defense of any lawsuit or failure to obtain any of these licenses could prevent us from
commercializing products or services, and the prohibition of sale of any of our technologies could materially affect our business and our ability to gain market acceptance for our
technology.

Litigation or other proceedings to enforce or defend intellectual property rights are often very complex in nature, may be very expensive and time-consuming, may divert our

management’s attention from our core business, and may result in unfavorable results that could adversely impact our ability to prevent third parties from competing with our
partner’s products or technologies. Any adverse outcome of such litigation or other proceedings could result in one or more or our patents being held invalid or unenforceable, which
could adversely affect our ability to successfully execute our business strategy and negatively impact our financial condition and results of operations. However, given the
unpredictability inherent in litigation, we cannot predict or guarantee the outcome of these matters or any other litigation. Regardless of how these matters are ultimately resolved,
these matters may be costly, time-consuming and distracting to our management, which could have a material adverse effect on our business. It may be necessary for us to pursue
litigation or adversarial proceedings before the patent office in order to enforce our patent and proprietary rights or to determine the scope, coverage and validity of the proprietary
rights of others. The outcome of any such litigation might not be favorable to us, and even if we were to prevail, such litigation could result in substantial costs and diversion of
resources and could have a material adverse effect on our business, operating results or financial condition.

In addition, periodic maintenance fees, renewal fees, annuity fees and various other governmental fees on patents and or applications will be due to the U.S. and various foreign

patent offices at various points over the lifetime of our and our licensees’ patents and/or applications. We have systems in place to remind us to pay these fees, and we rely on our
outside patent annuity service to pay these fees when due. Additionally, the U.S. and various foreign patent offices require compliance with a number of procedural, documentary, fee
payment and other similar provisions during the patent application process. We employ reputable law firms and other professionals to help us comply, and in many cases, an
inadvertent lapse can be cured by payment of a late fee or by other means in accordance with rules applicable to the particular jurisdiction. However, there are situations in which
noncompliance 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. If such an event
were to occur, it could have a material adverse effect on our business.

Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information

could be compromised by disclosure during this type of litigation. In addition, during the course of this kind of litigation, 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.

Any conflicts with the patent rights of others could significantly reduce the coverage of our patents or limit our ability to obtain meaningful patent protection. For example, our

European patent related to Agglomerated forms of Captisol was limited during an opposition proceeding, and the rejection of our European patent application related to High Purity
Captisol was upheld on appeal. In addition, any determination that our patent rights are invalid may result in early termination of our agreements with our license partners and could
adversely affect our ability to enter into new license agreements. We also rely on unpatented trade secrets and know-how to protect and maintain our competitive position. We require
our employees, consultants, licensees and others to sign confidentiality agreements when they begin their relationship with us. These

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agreements may be breached, and we may not have adequate remedies for any breach. In addition, our competitors may independently discover our trade secrets.

We may also need to initiate litigation, which could be time-consuming and expensive, to enforce our proprietary rights or to determine the scope and validity of others' rights.

If this occurs, a court may find our patents or those of our licensors invalid or may find that we have infringed on a competitor's rights. In addition, if any of our competitors have
filed patent applications in the United States which claim technology we also have invented, the United States Patent and Trademark Office may require us to participate in expensive
interference proceedings to determine who has the right to a patent for the technology.

In addition, our agreements with some of our partners, suppliers or other entities with whom we do business require us to defend or indemnify these parties to the extent they

become involved in infringement claims, including the types of claims described above. We could also voluntarily agree to defend or indemnify third parties in instances where we are
not obligated to do so if we determine it would be important to our business relationships. If we are required or agree to defend or indemnify third parties in connection with any
infringement claims, we could incur significant costs and expenses that could adversely affect our business, financial condition, results of operations and prospects. The occurrence of
any of the foregoing problems could be time-consuming and expensive and could adversely affect our financial position, liquidity and results of operations.

If we are unable to obtain and maintain sufficient intellectual property protection for our products, platform and technology, or if the scope of the intellectual property protection
obtained is not sufficiently broad, our competitors could develop and commercialize technologies or a platform similar or identical to ours, and our ability to successfully sell our
platform and services may be impaired.

Our success depends in part on our ability to obtain and maintain adequate protection of the intellectual property we may own solely and jointly with others or otherwise have
rights to, particularly patents, in the United States and in other countries with respect to our platform, our software and our technologies, without infringing the intellectual property
rights of others.

We strive to protect and enhance the proprietary technologies that we believe are important to our business, including seeking patents intended to cover our platform and

related technologies and uses thereof, as we deem appropriate. However, obtaining and enforcing patents in our industry is costly, time-consuming and complex, and we may fail to
apply for patents on important products and technologies in a timely fashion or at all, or we may fail to apply for patents in potentially relevant jurisdictions. There can be no
assurance that the claims of our patents (or any patent application that issues as a patent), will exclude others from making, using, importing, offering for sale, or selling products or
services that are substantially similar to ours. We also rely on trade secrets to protect aspects of our business that are not amenable to, or that we do not consider appropriate for, patent
protection. In countries where we have not sought and do not seek patent protection, third parties may be able to manufacture and sell our technology without our permission, and we
may not be able to stop them from doing so. We may not be able to file and prosecute all necessary or desirable patent applications, or maintain, enforce and license any patents that
may issue from such patent applications, at a reasonable cost or in a timely manner. It is also possible that we will fail to identify patentable aspects of our research and development
output before it is too late to obtain patent protection. We may not have the right to control the preparation, filing and prosecution of patent applications, or to maintain the rights to
patents licensed to third parties. Therefore, these patents and applications may not be prosecuted and enforced in a manner consistent with the best interests of our business.

It is possible that none of our pending patent applications will result in issued patents in a timely fashion or at all, and even if patents are granted, they may not provide a basis

for intellectual property protection of commercially viable products or services, may not provide us with any competitive advantages, or may be challenged and invalidated by third
parties or deemed unenforceable by a court. It is possible that others will design around our current or future patented technologies. As a result, our owned and licensed patents and
patent applications comprising our patent portfolio may not provide us with sufficient rights to exclude others from commercializing technology and products similar to any of our
products, platform and technology.

In addition, we may identify third party intellectual property and technology we may need to acquire or license in order to engage in our business, including to develop or

commercialize new technologies. However, such licenses may not be available to us on acceptable terms or at all.

Issued patents directed to our platform and technology could be found invalid or unenforceable if challenged in court or before administrative bodies in the United States or
abroad.

The issuance of a patent is not conclusive as to its inventorship, scope, validity or enforceability. Some of our patents or patent applications (including licensed patents) may be
challenged at a future point in time in opposition, derivation, reexamination, inter partes review, post-grant review or interference. Any successful third party challenge to our patents
in this or any other proceeding could result in the unenforceability or invalidity of such patents or amendment to our patents in such a way that any resulting protection may lead to
increased competition to our business, which could harm our business. In addition, in patent litigation in the United States, defendant counterclaims alleging invalidity or
unenforceability are

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commonplace. The outcome following legal assertions of invalidity and unenforceability during patent litigation is unpredictable. If a defendant were to prevail on a legal assertion of
invalidity or unenforceability, we would lose at least part, and perhaps all, of the patent protection on certain aspects of our platform technologies. In addition, if the breadth or
strength of protection provided by our patents and patent applications is threatened, regardless of the outcome, it could dissuade companies from collaborating with us to license,
develop or commercialize current or future products, platform and technology.

We may not be aware of all third party intellectual property rights potentially relating to our products, platform and technology. 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 approximately 18 months after
filing or, in some cases, not until such patent applications issue as patents. We or our licensors might not have been the first to make the inventions included in each of our pending
patent applications and we or our licensors might not have been the first to file patent applications for these inventions. There is also no assurance that all of the potentially relevant
prior art relating to our patents and patent applications or licensed patents and patent applications has been found, which could be used by a third party to challenge their validity, or
prevent a patent from issuing from a pending patent application.

To determine the priority of these inventions, we may have to participate in interference proceedings, derivation proceedings or other post-grant proceedings declared by the
USPTO that could result in substantial cost to us. The outcome of such proceedings is uncertain. No assurance can be given that other patent applications will not have priority over
our patent applications. In addition, changes to the patent laws of the United States allow for various post-grant opposition proceedings that have not been extensively tested, and their
outcome is therefore uncertain. Furthermore, if third parties bring these proceedings against our patents, we could experience significant costs and management distraction.

The validity, scope and enforceability of any patents that cover our partners’ biologic product candidate can be challenged by third parties.

For biologics, the Biologics Price Competition and Innovation Act of 2009, BPCIA, provides a mechanism for one or more third parties to seek FDA approval to manufacture

or sell biosimilar or interchangeable versions of brand name biological products. Due to the large size and complexity of biological products, as compared to small molecules, a
biosimilar must be “highly similar” to the reference product with “no clinically meaningful differences between the two.” The BPCIA does not require reference product sponsors to
list patents in an Orange Book and does not include an automatic 30-month stay of FDA approval upon the timely filing of a lawsuit. The BPCIA, however, does require a formal pre-
litigation process which includes the exchange of information between a biosimilar applicant and a reference biologic sponsor that includes the identification of relevant patents and
each parties’ basis for infringement and invalidity. After the exchange of this information, sponsors may then initiate a lawsuit within 30 days to defend the patents identified in the
exchange. If the biosimilar applicant successfully challenges the asserted patent claims it could result in the invalidation of, or render unenforceable, some or all of the relevant patent
claims or result in a finding of non-infringement. Such litigation or other proceedings to enforce or defend intellectual property rights are often very complex in nature, may be very
expensive and time-consuming, may divert our management’s attention from our core business, and may result in unfavorable results that could limit our partners’ ability to prevent
third parties from competing with their products or product candidates.

We rely on in-licenses from third parties. If we lose these rights, our business may be materially and adversely affected, our ability to develop improvements to our technology
platform and antibody discovery platform may be negatively and substantially impacted, and if disputes arise, we may be subjected to future litigation, as well as the potential loss
of or limitations on our ability to incorporate the technology covered by these license agreements.

We are party to royalty-bearing license agreements that grant us rights to practice certain patent rights that are related to our products, platform and technology. In spite of our

efforts to comply with our obligations under our in-license agreements, our licensors might conclude that we have materially breached our obligations under our license agreements
and might therefore, including in connection with any aforementioned disputes, terminate the relevant license agreement, thereby removing or limiting our ability to develop and
commercialize technology covered by these license agreements. If any such in-license is terminated, or if the licensed patents fail to provide the intended exclusivity, competitors or
other third parties might have the freedom to market or develop technologies similar to ours. In addition, absent the rights granted to us under our license agreements, we may infringe
the intellectual property rights that are the subject of those agreements, we may be subject to litigation by the licensor, and if such litigation by the licensor is successful we may be
required to pay damages to our licensor, or we may be required to cease our development and commercialization activities that are deemed infringing, and in such event we may
ultimately need to modify our activities or technologies to design around such infringement, which may be time- and resource-consuming, and which ultimately may not be
successful. Any of the foregoing could have a material adverse effect on our business, financial condition, results of operations and prospects.

In addition, our rights to certain components of our technology platform, may be licensed to us on a non-exclusive basis. The owners of these non-exclusively licensed
technologies are therefore free to license them to third parties, including our competitors, on terms that may be superior to those offered to us, which could place us at a competitive
disadvantage.

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Moreover, our licensors may own or control intellectual property that has not been licensed to us and, as a result, we may be subject to claims, regardless of their merit, that we are
infringing or otherwise violating the licensor’s rights. In addition, certain of our agreements with third parties may provide that intellectual property arising under these agreements,
such as data that could be valuable to our business, will be owned by the third party, in which case, we may not have adequate rights to use such data or have exclusivity with respect
to the use of such data, which could result in third parties, including our competitors, being able to use such data to compete with us.

We may be subject to claims challenging the inventorship of our patents and other intellectual property.

We or our licensors may be subject to claims that former employees, partners or other third parties have an interest in our or our in-licensed patents, trade secrets or other

intellectual property as an inventor or co-inventor. Litigation may be necessary to defend against these and other claims challenging inventorship of our or our licensors’ ownership
of our owned or in-licensed patents, trade secrets or other intellectual property. If we or our licensors 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, intellectual property that is important to our systems, including our software, workflows,
consumables, reagents, and transgenic animals. Even if we are successful in defending against such claims, litigation could result in substantial costs and be a distraction to
management and other employees, and certain partners or partners may defer engaging with us until the particular dispute is resolved. Any of the foregoing could have a material
adverse effect on our business, financial condition, results of operations and prospects.

If we are unable to protect the confidentiality of our information and our trade secrets, the value of our technology could be materially and adversely affected and our business
could be harmed.

We rely on trade secrets and confidentiality agreements to protect our unpatented know-how, technology and other proprietary information, including parts of our technology
platform, and to maintain our competitive position. However, trade secrets and know-how can be difficult to protect. In addition to pursuing patents on our technology, we take steps
to protect our intellectual property and proprietary technology by entering into agreements, including confidentiality agreements, non-disclosure agreements and intellectual property
assignment agreements, with our employees, consultants, academic institutions, corporate partners and, when needed, our advisers. However, we cannot be certain that such
agreements have been entered into with all relevant parties, and we cannot be certain that our trade secrets and other confidential proprietary information will not be disclosed or that
competitors will not otherwise gain access to our trade secrets or independently develop substantially equivalent information and techniques. For example, any of these parties may
breach the agreements and disclose our proprietary information, including our trade secrets, and we may not be able to obtain adequate remedies for such breaches. Such agreements
may not be enforceable or may not provide meaningful protection for our trade secrets or other proprietary information in the event of unauthorized use or disclosure or other
breaches of the agreements, and we may not be able to prevent such unauthorized disclosure, which could adversely impact our ability to establish or maintain a competitive
advantage in the market. If we are required to assert our rights against such party, it could result in significant cost and distraction.

Monitoring unauthorized disclosure and detection of unauthorized disclosure is difficult, and we do not know whether the steps we have taken to prevent such disclosure are, or

will be, adequate. If we were to enforce a claim that a third party had illegally obtained and was using our trade secrets, it would be expensive and time-consuming, and the outcome
would be unpredictable. In addition, some courts both within and outside the United States may be less willing, or unwilling, to protect trade secrets. Further, we may need to share
our trade secrets and confidential know-how with current or future partners, collaborators, contractors and others located in countries at heightened risk of theft of trade secrets,
including through direct intrusion by private parties or foreign actors, and those affiliated with or controlled by state actors.

We also seek to preserve the integrity and confidentiality of our confidential proprietary information by maintaining physical security of our premises and physical and
electronic security of our information technology systems, but it is possible that these security measures could be breached. If any of our confidential proprietary information were to
be lawfully obtained or independently developed by a competitor or other third party, absent patent protection, we would have no right to prevent such competitor from using that
technology or information to compete with us, which could harm our competitive position. If any of our trade secrets were to be disclosed to or independently discovered by a
competitor or other third party, it could harm our business, financial condition, results of operations and prospects.

Risks Related to Government Regulation and Legal Proceedings:

Market acceptance and sales of any approved product will depend significantly on the availability and adequacy of coverage and reimbursement from third-party payors and may
be affected by existing and future healthcare reform measures.

Sales of the products we license to our collaboration partners and the royalties we receive will depend in large part on the extent to which coverage and reimbursement is

available from government and health administration authorities, private health

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maintenance organizations and health insurers, and other healthcare payors. Significant uncertainty exists as to the reimbursement status of healthcare products. Healthcare payors,
including Medicare, are challenging the prices charged for medical products and services. Government and other healthcare payors are increasingly attempting to contain healthcare
costs by limiting both coverage and the level of reimbursement for medical products. Even if a product is approved by the FDA, insurance coverage may not be available, and
reimbursement levels may be inadequate, to cover the costs associated with the research, development, marketing and sale of the product. If government and other healthcare payors
do not provide adequate coverage and reimbursement levels for any product, market acceptance and any sales could be reduced.

From time to time, legislation is implemented to reign in rising healthcare expenditures. By way of example, in March 2010, the Patient Protection and Affordable Care Act, as

amended by the Health Care and Education Reconciliation Act, or collectively, the ACA, was enacted, which included a number of provisions affecting the pharmaceutical industry,
including, among other things, annual, non-deductible fees on any entity that manufactures or imports some types of branded prescription drugs and increases in Medicaid rebates
owed by manufacturers under the Medicaid Drug Rebate Program. Since its enactment, there have been judicial, executive and Congressional challenges to certain aspects of the
ACA. On June 17, 2021, the U.S. Supreme Court dismissed the most recent judicial challenge to the ACA brought by several states without specifically ruling on the constitutionality
of the ACA. Prior to the Supreme Court’s decision, President Biden had issued an executive order to initiate a special enrollment period from February 15, 2021 through August 15,
2021 for purposes of obtaining health insurance coverage through the ACA marketplace. The executive order also instructed certain governmental agencies to review and reconsider
their existing policies and rules that limit access to healthcare, including among others, reexamining Medicaid demonstration projects and waiver programs that include work
requirements, and policies that create unnecessary barriers to obtaining access to health insurance coverage through Medicaid or the ACA.

Other legislative changes have been proposed and adopted since the ACA was enacted, including aggregate reductions of Medicare payments to providers, which was
temporarily suspended from March 1, 2020 through March 31, 2022, and reduced payments to several types of Medicare providers. Moreover, there has recently been heightened
governmental scrutiny over the manner in which manufacturers set prices for their marketed products, which has resulted in several Congressional inquiries and proposed bills
designed to, among other things, bring more transparency to product pricing, review the relationship between pricing and manufacturer patient programs, and reform government
program reimbursement methodologies for drug products. Most recently, in August 2022, the Inflation Reduction Act of 2022 (IRA), was signed into law. 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 the Department of Health and Human Services (HHS) to implement many of these provisions through
guidance, as opposed to regulation, for the initial years. For that and other reasons, it is currently unclear how the IRA will be effectuated, and the impact of the IRA on our business
and the pharmaceutical industry cannot yet be fully determined. Individual states in the United States have also become increasingly active in implementing regulations designed to
control pharmaceutical 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. We cannot predict whether other legislative changes will be
adopted, if any, or how such changes would affect our operations or financial condition.

If we or our commercialization partners market products in a manner that violates healthcare laws, we may be subject to civil or criminal penalties.

We and our collaboration partners are subject to federal and state healthcare laws, including fraud and abuse, anti-kickback, false claims, physician payment transparency and
civil monetary penalties. These laws may impact, among other things, financial arrangements with physicians, sales, marketing and education programs and the manner in which any
of those activities are implemented. If our operations or those of our collaboration partners are found to be in violation of any of those laws or any other applicable governmental
regulations, we or our collaboration partners may be subject to penalties, including civil and criminal penalties, damages, fines, imprisonment, exclusion from government healthcare
programs or the curtailment or restructuring of operations, any of which could adversely affect our ability to operate our business and our financial condition.

Changes in and actual or perceived failures to comply with applicable data privacy, security and protection laws, regulations, standards and contractual obligations may adversely
affect our business, operations and financial performance.

We and our partners may be subject to federal, state, and foreign laws and regulations that govern data privacy and security. The legislative and regulatory landscape for

privacy and data protection continues to evolve, and there has been an increasing focus on privacy and data protection issues, which may affect our business and may increase our
compliance costs and exposure to liability. In the United States, numerous federal and state laws and regulations govern the collection, use, disclosure, and protection of personal
information, including state data breach notification laws, federal and state health information privacy laws, and federal and state consumer protection laws. Each of these laws is
subject to varying

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interpretations by courts and government agencies, creating complex compliance issues. If we fail to comply with applicable laws and regulations we could be subject to penalties or
sanctions, including criminal penalties if we knowingly obtain or disclose individually identifiable health information from a covered entity in a manner that is not authorized or
permitted by the Health Insurance Portability and Accountability Act, as amended by the Health Information Technology for Economic and Clinical Health Act of 2009, and
regulations implemented thereunder (collectively, HIPAA) or applicable state laws.

Certain states have also adopted comparable privacy and security laws and regulations, which govern the privacy, processing and protection of health-related and other personal

information. Such laws and regulations will be subject to interpretation by various courts and other governmental authorities, thus creating potentially complex compliance issues for
us and our future customers and strategic partners. For example, the California Consumer Privacy Act of 2018 (CCPA) went into effect on January 1, 2020. The CCPA creates
individual privacy rights for California consumers and increases the privacy and security obligations of entities handling certain personal information. The CCPA provides for civil
penalties for violations, as well as a private right of action for data breaches that is expected to increase data breach litigation. Further, the California Privacy Rights Act (CPRA)
passed in California, and it significantly amends the CCPA. It will impose additional data protection obligations on covered businesses, including additional consumer rights
processes, limitations on data uses, new audit requirements for higher risk data, and opt outs for certain uses of sensitive data. It will also create a new California data protection
agency authorized to issue substantive regulations and could result in increased privacy and information security enforcement. The majority of the provisions went into effect on
January 1, 2023, and additional compliance investment and potential business process changes may be required. Similar laws have passed in Virginia, Colorado, Connecticut and
Utah, and have been proposed in other states and at the federal level, reflecting a trend toward more stringent privacy legislation in the United States. The enactment of such laws
could have potentially conflicting requirements that would make compliance challenging. In the event that we are subject to or affected by HIPAA, the CCPA, the CPRA or other
domestic privacy and data protection laws, any liability from failure to comply with the requirements of these laws could adversely affect our financial condition.

We are also or may become subject to rapidly evolving data protection laws, rules and regulations in foreign jurisdictions. For example, the European Union General Data

Protection Regulation (GDPR) governs certain collection and other processing activities involving personal data about individuals in the European Economic Area (EEA). Among
other requirements, the GDPR regulates transfers of personal data subject to the GDPR to third countries that have not been found to provide adequate protection to such personal
data, including the United States; in July 2020, the Court of Justice of the European Union (CJEU) limited how organizations could lawfully transfer personal data from the European
Union/EEA to the United States by invalidating the Privacy Shield for purposes of international transfers and imposing further restrictions on the use of standard contractual clauses
(SCCs). In March 2022, the United States and European Union announced a new regulatory regime intended to replace the invalidated regulations; however, this new EU-US Data
Privacy Framework has not been implemented beyond an executive order signed by President Biden on October 7, 2022 on Enhancing Safeguards for United States Signals
Intelligence Activities. European court and regulatory decisions subsequent to the CJEU decision of July 2020 have taken a restrictive approach to international data transfers. As
supervisory authorities issue further guidance on personal data export mechanisms, including circumstances where the SCCs cannot be used, and/or start taking enforcement action,
we could suffer additional costs, complaints and/or regulatory investigations or fines, and/or if we are otherwise unable to transfer personal data between and among countries and
regions in which we operate, it could affect the manner in which we provide our services, the geographical location or segregation of our relevant systems and operations, and could
adversely affect our financial results.

Since the beginning of 2021, after the end of the transition period following the United Kingdom’s departure from the European Union, we are also subject to the United
Kingdom data protection regime, which imposes separate but similar obligations to those under the GDPR and comparable penalties, including fines of up to £17.5 million or 4% of a
noncompliant company’s global annual revenue for the preceding financial year, whichever is greater. As we continue to expand into other foreign countries and jurisdictions, we may
be subject to additional laws and regulations that may affect how we conduct business.

Compliance with applicable data privacy and security laws, rules and regulations could require us to take on more onerous obligations in our contracts, require us to engage in
costly compliance exercises, restrict our ability to collect, use and disclose data, or in some cases, impact our or our partners’ ability to operate in certain jurisdictions. Each of these
constantly evolving laws can be subject to varying interpretations. If we fail to comply with any such laws, rules or regulations, we may face government investigations and/or
enforcement actions, fines, civil or criminal penalties, private litigation or adverse publicity that could adversely affect our business, financial condition and results of operations.

28

Changes in funding for the FDA and other government agencies could hinder their ability to hire and retain key leadership and other personnel, or otherwise prevent new
products and services from being developed or commercialized in a timely manner, which could negatively impact our business or the business of our partners.

The ability of the FDA to review and approve new products can be affected by a variety of factors, including government budget and funding levels, ability to hire and retain

key personnel and accept the payment of user fees, and statutory, regulatory, and policy changes. Average review times at the FDA have fluctuated in recent years as a result. 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 also slow the time necessary for new drugs and biologics to be reviewed and/or approved by necessary government agencies,

which would adversely affect our business or the business of our partners. For example, over the last several years, the U.S. government has shut down several times and certain
regulatory agencies, such as the FDA, have had to furlough critical FDA employees and stop critical activities. If a prolonged government shutdown occurs, it could significantly
impact the ability of the FDA to timely review and process our regulatory submissions, which could have a material adverse effect on our business. If the timing of FDA’s review and
approval of new products is delayed, the timing of our or our partners’ development process may be delayed which would result in delayed milestone revenues and materially harm
our operations of business.

Separately, in response to the COVID-19 pandemic, the FDA postponed most inspections of domestic and foreign manufacturing facilities at various points. Even though the

FDA has since resumed standard inspection operations of domestic facilities where feasible, the FDA has continued to monitor and implement changes to its inspectional activities to
ensure the safety of its employees and those of the firms it regulates as it adapts to the evolving COVID-19 pandemic, and any resurgence of the virus or emergence of new variants
may lead to further inspectional delays. Regulatory authorities outside the United States may adopt similar restrictions or other policy measures in response to the COVID-19
pandemic. If a prolonged government shutdown occurs, or if global health concerns continue to hinder or 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.

If plaintiffs bring product liability lawsuits against us or our partners, we or our partners may incur substantial liabilities and may be required to limit commercialization of our
approved products and product candidates.

As is common in our industry, our partners and we face an inherent risk of product liability as a result of the clinical testing of our product candidates in clinical trials and face
an even greater risk for commercialized products. Although we are not currently a party to product liability litigation, if we are sued, we may be held liable if any product or product
candidate we develop causes injury or is found otherwise unsuitable during product testing, manufacturing, marketing or sale. Regardless of merit or eventual outcome, liability
claims may result in decreased demand for any product candidates, partnered products or products that we may develop, injury to our reputation, discontinuation of clinical trials, costs
to defend litigation, substantial monetary awards to clinical trial participants or patients, loss of revenue and product recall or withdrawal from the market and the inability to
commercialize any products that we develop. We have product liability insurance that covers our clinical trials up to a $10.0 million annual limit. Our insurance coverage may not be
sufficient to cover all of our product liability related expenses or losses and may not cover us for any expenses or losses we may suffer. If we are sued for any injury caused by our
product candidates, partnered products or any future products, our liability could exceed our total assets.

We face risks related to handling of hazardous materials and other regulations governing environmental safety.

Our operations are subject to complex and stringent environmental, health, safety and other governmental laws and regulations that both public officials and private individuals

may seek to enforce. Our activities that are subject to these regulations include, among other things, our use of hazardous materials and the generation, transportation and storage of
waste. Although we have secured clearance from the EPA historically, and currently are operating in material compliance with applicable EPA rules and regulations, our business
could be adversely affected if we discover that we or an acquired business is not in material compliance with these rules and regulations. In the future, we may pursue the use of other
surfactant substances that will require clearance from the EPA, and we may fail to obtain such clearance. Existing laws and regulations may also be revised or reinterpreted, or new
laws and regulations may become applicable to us, whether retroactively or prospectively, that may have a negative effect on our business and results of operations. It is also
impossible to eliminate completely the risk of accidental environmental contamination or injury to individuals. In such an event, we could be liable for any damages that result, which
could adversely affect our business.

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Risk Related to Our Strategic Transactions:

Any difficulties from strategic acquisitions could adversely affect our stock price, operating results and results of operations.

We may acquire companies, businesses and products that complement or augment our existing business. We may not be able to integrate any acquired business successfully or
operate any acquired business profitably. Integrating any newly acquired business could be expensive and time-consuming. Integration efforts often take a significant amount of time,
place a significant strain on managerial, operational and financial resources and could prove to be more difficult or expensive than we predict. The diversion of our management's
attention and any delay or difficulties encountered in connection with any future acquisitions we may consummate could result in the disruption of our ongoing business or
inconsistencies in standards and controls that could negatively affect our ability to maintain third-party relationships. Moreover, we may need to raise additional funds through public
or private debt or equity financing, or issue additional shares, to acquire any businesses or products, which may result in dilution for stockholders or the incurrence of indebtedness.

As part of our efforts to acquire companies, business or product candidates or to enter into other significant transactions, we conduct business, legal and financial due diligence
with the goal of identifying and evaluating material risks involved in the transaction. Despite our efforts, we ultimately may be unsuccessful in ascertaining or evaluating all such risks
and, as a result, might not realize the intended advantages of the transaction. If we fail to realize the expected benefits from acquisitions we may consummate in the future or have
consummated in the past, whether as a result of unidentified risks, integration difficulties, regulatory setbacks, litigation with current or former employees and other events, our
business, results of operations and financial condition could be adversely affected. If we acquire product candidates, we will also need to make certain assumptions about, among other
things, development costs, the likelihood of receiving regulatory approval and the market for such product candidates. Our assumptions may prove to be incorrect, which could cause
us to fail to realize the anticipated benefits of these transactions.

In addition, we will likely experience significant charges to earnings in connection with our efforts, if any, to consummate acquisitions. For transactions that are ultimately not

consummated, these charges may include fees and expenses for investment bankers, attorneys, accountants and other advisors in connection with our efforts. Even if our efforts are
successful, we may incur, as part of a transaction, substantial charges for closure costs associated with elimination of duplicate operations and facilities and acquired in-process
research and development charges. In either case, the incurrence of these charges could adversely affect our results of operations for particular quarterly or annual periods.

Other Risks:

Our business is subject to risks arising from epidemic diseases, such as the COVID-19 pandemic, which has impacted and could continue to impact our business.

The COVID-19 pandemic continues to impact worldwide public health and economic activity. A pandemic, including COVID-19 or other public health epidemic, poses the
risk that we or our employees, contractors, including our CROs, suppliers, and other partners may be prevented from conducting business activities for an indefinite period of time,
including due to spread of the disease within these groups or due to shutdowns that may be requested or mandated by governmental authorities. Although we have lifted most of the
restrictions we previously imposed on in-person access to our facilities and currently do not believe the COVID-19 pandemic is having a material impact on our business, we cannot
guarantee that the COVID-19 pandemic, including the emergence of variants, or a similar event, will not impact our operations in the future.

Several of our partners reported that their operations were impacted, including delays in research and development programs and deprioritizing clinical trials in favor of treating

patients who have contracted the virus or to prevent the spread of the virus. This may lead to clinical trial protocol deviations or to discontinuation of treatment for patients who are
currently enrolled in the clinical trials being conducted by us or our partners. In addition, certain of our partners reported negative impacts on product sales which will impact our
royalty revenues. Although we believe that we and our partners have adjusted our business practices to the impacts of the COVID-19 pandemic, we may experience disruptions that
could severely impact our business, drug manufacturing and supply chain, nonclinical activities and clinical trials and our partners’ business may be impacted in similar ways,
including due to delays or difficulties in enrolling patients in clinical trials, diversion of healthcare resources away from the conduct of clinical trials, interruption of, or delays in
receiving, supplies of Captisol or other product or product candidates from contract manufacturing organizations due to staffing shortages, production slowdowns or stoppages and
disruptions in delivery systems, which may result in cancellations of Captisol orders or refunds if we fail to deliver Captisol timely, interruption or delays to discovery and
development pipelines and difficulties launching or commercializing products, including due to reduced access to doctors as a result of social distancing protocols.

Further, the spread of COVID-19 has had and may continue to severely impact the trading price of shares of our common stock and could further severely impact our ability to

raise additional capital on a timely basis or at all. The extent to which the

30

COVID-19 pandemic, or any other outbreak of an epidemic disease, impacts our results will depend on future developments that are highly uncertain and cannot be predicted,
including new information that may emerge concerning the severity of the virus and the actions to contain its impact. Further, to the extent the COVID-19 pandemic or any other
outbreak of an epidemic disease adversely affects our business and financial results, it may also have the effect of heightening many of the other risks described in this section.

Our operating results may fluctuate significantly, which makes our future operating results difficult to predict and could cause our operating results to fall below expectations or
any guidance we may provide.

Our quarterly and annual operating results may fluctuate significantly, which makes it difficult for us to predict our future operating results. These fluctuations may occur due to

a variety of factors, many of which are outside of our control, including, but not limited to:

•
•
•
•

•
•

the royalties from the sales of Kyprolis, Evomela and other products sold by our partners;
the success of our collaboration partners’ preclinical and clinical programs;
the timing of Captisol purchases for use in clinical trials and commercial products;
the timing and cost of, and level of investment in, research, development, regulatory approval and commercialization activities relating to our internal development programs,
which may change from time to time;
expenditures that we may incur to acquire or develop additional product candidates and platform technologies; and
future accounting pronouncements or changes in our accounting policies.

The cumulative effects of these factors could result in large fluctuations and unpredictability in our quarterly and annual operating results and revenues. This variability and

unpredictability could result in our failing to meet the expectations of industry or financial analysts or investors for any period. If our revenue or operating results fall below the
expectations of analysts or investors or below any forecasts we may provide to the market, or if the forecasts we provide to the market are below the expectations of analysts or
investors, the price of our common stock could decline substantially. Such a stock price decline could occur even when we have met any previously publicly stated revenue or
earnings guidance we may provide.

Changes or modifications in financial accounting standards, including those related to revenue recognition, may harm our results of operations.

From time to time, the FASB either alone or jointly with other organizations, promulgates new accounting principles that could have an adverse impact on our results of

operations. For example, in May 2014, FASB issued an accounting standard for revenue recognition-Accounting Standards Codification Topic 606, Revenue from Contracts with
Customers, or ASC 606-that supersedes most current revenue recognition guidance. The guidance requires a company to recognize revenue upon transfer of goods or services to a
customer at an amount that reflects the expected consideration to be received in exchange for those goods or services. The guidance became effective in fiscal 2018.

Under ASC 606, Ligand estimates and books royalties in the same quarter that our partners report the sale of the underlying product. We rely on our partners’ earning releases

and other information from our partners to determine the sales of our partners’ products and to estimate the related royalty revenues. If our partners report incorrect sales, or if our
partners delay reporting of their earnings release, our royalty estimates may need to be revised and/or our financial reporting may be delayed.

Our ability to use our net operating loss carryforwards and certain other tax attributes to offset future taxable income may be subject to certain limitations.

As of December 31, 2022, we had U.S. federal and state net operating loss carryforwards (NOLs) of approximately $81.1 million and $168.3 million, respectively. Our federal
NOLs expire through 2037 and our state NOLs begin to expire in 2029, if not utilized. Under the Tax Act, any federal NOLs arising in taxable years ending after December 31, 2017
will carry forward indefinitely. As of December 31, 2022, we had federal and California research and development tax credit carryforwards of approximately $8.5 million and $29.0
million, respectively. The federal research and development tax credit carryforwards expire in various years through 2040, if not utilized. The California research and development
credit will carry forward indefinitely. Under Sections 382 and 383 of Internal Revenue Code of 1986, as amended (Code) if a corporation undergoes an “ownership change,” the
corporation’s ability to use its pre-change NOLs and other pre-change tax attributes, such as research tax credits, to offset its future post-change income and taxes may be limited. In
general, an “ownership change” occurs if there is a cumulative change in our ownership by “5% shareholders” that exceeds 50 percentage points over a rolling three-year period.
Similar rules may apply under state tax laws. We believe we have experienced certain ownership changes in the past and have reduced our deferred tax assets related to NOLs and
research and development tax credit carryforwards accordingly. In the event that it is determined that we have in the past experienced additional ownership changes, or if we
experience one or more ownership changes as a result future transactions in our stock, then we may be further limited in our ability to use our NOLs and other tax assets to reduce
taxes owed on the net taxable income that we earn in the event that we attain profitability. Furthermore, under the Tax Act, although the treatment of tax losses generated in tax years
beginning before December 31,

31

2017 has generally not changed, tax losses generated in tax years beginning after December 31, 2017 may only offset 80% of our taxable income. This change may require us to pay
federal income taxes in future years despite having potentially generated a loss for federal income tax purposes in prior years. Any such limitations on the ability to use our NOLs and
other tax assets could adversely impact our business, financial condition and operating results.

The occurrence of a catastrophic disaster could disrupt our business, damage our facilities beyond insurance limits, increase our costs and expenses, or we could lose key data
which could cause us to curtail or cease operations.

We are vulnerable to damage, business disruptions and/or loss of vital data from natural or man-made disasters, such as earthquakes, tornadoes, severe weather conditions,

power loss, fire, floods and similar events, as well as from accidental loss or destruction. If any disaster were to occur, our ability to operate our business could be seriously impaired.
We have property, liability, and business interruption insurance which may not be adequate to cover our losses resulting from disasters or other similar significant business
interruptions, and we do not plan to purchase additional insurance to cover such losses due to the cost of obtaining such coverage. Any significant losses that are not recoverable under
our insurance policies could seriously impair our business, financial condition and prospects. Our ability to obtain Captisol supply from our third-party manufactures could be
disrupted if the operations of these manufacturers were affected by a natural or man-made disaster or other business interruption. In addition, we rely on our partners to generate most
of our revenues through royalties, Captisol sales and development activities and any disruptions to their business as a result of such disasters could negatively impact our revenues.

We rely on information technology system and any failure, inadequacy, interruption or security lapse of our information technology systems, including any cyber security
incidents, could harm our ability to operate our business effectively.

Our business is increasingly dependent on critical, complex and interdependent information technology systems, including internet-based systems, to support business

processes as well as internal and external communications. We operate some of these systems and networks, but we also rely on third-party providers for various products and services
across our operations. Despite the implementation of security measures, our information technology systems and those of our partners and third party service providers are vulnerable
to attack, damage, and interruption from cyber-attacks, computer viruses and malware (e.g. ransomware), security breaches, unauthorized access, natural disasters, terrorism, war,
telecommunication and electrical failures, hacking, phishing attacks and other social engineering schemes, employee theft or misuse, human error, fraud, denial or degradation of
service attacks, sophisticated nation-state and nation-state-supported actors or unauthorized access or use by persons inside our organization, or persons with access to systems inside
our organization.

Attacks upon information technology systems are increasing in their frequency, levels of persistence, sophistication and intensity, and are being conducted by sophisticated and

organized groups and individuals with a wide range of motives and expertise. Furthermore, because the technologies used to obtain unauthorized access to, or to sabotage or disrupt,
systems change frequently and often are not recognized until launched against a target, we may be unable to anticipate these techniques or implement adequate preventative measures.
We may also experience security breaches that may remain undetected for an extended period. Even if identified, we may be unable to adequately investigate or remediate incidents
or breaches due to attackers increasingly using tools and techniques that are designed to circumvent controls, to avoid detection, and to remove or obfuscate forensic evidence. As a
result of the COVID-19 pandemic, or any future epidemic diseases, we may also face increased cybersecurity risks due to our reliance on internet technology and the number of our
and our service providers’ employees who are (and may continue to be) working remotely, which may create additional opportunities for cybercriminals to exploit vulnerabilities. The
White House, SEC and other regulators have also increased their focus on companies’ cybersecurity vulnerabilities and risks.

We and certain of our service providers are from time to time, subject to cyberattacks and security incidents. While we do not believe that we have experienced any significant

system failures, accidents or security breaches, if such an event were to occur and cause interruptions in our or our critical third parties’ operations, it could lead to the loss of trade
secrets or other intellectual property, as well as the public exposure of personal information of our employees and others, and could result in a material disruption of our clinical and
commercialization activities and business operations, in addition to possibly requiring substantial expenditures to remedy. To the extent that any disruption or security breach were to
result in a loss of, or damage to, our data or applications, or inappropriate disclosure of confidential or proprietary information, we could incur liability and our business, reputation,
and financial condition could be harmed. Any losses, costs or liabilities may not be covered by, or may exceed the coverage limits of, any or all applicable insurance policies.

Conversion of our outstanding convertible notes may result in losses, result in the dilution of existing stockholders, create downward pressure on the price of our common stock,
and restrict our ability to take advantage of future opportunities.

In May 2018, we issued $750.0 million principal amount of the 2023 Notes. The sale of the 2023 Notes may affect our earnings per share figures, as accounting procedures
require that we include in our calculation of earnings per share the number of shares of our common stock into which the 2023 Notes are convertible. The convertible notes may be
converted into cash and shares of our common stock, if any (subject to our right or obligation to pay cash in lieu of all or a portion of such shares).

32

If shares of our common stock are issued to the holders of the convertible notes upon conversion, there will be dilution to our shareholders equity and the market price of our shares
may decrease due to the additional selling pressure in the market. Any downward pressure on the price of our common stock caused by the sale or potential sale of shares issuable
upon conversion of the convertible notes could also encourage short sales by third parties, creating additional selling pressure on our stock. Upon the occurrence of certain
circumstances, holders of the convertible notes may require us to purchase all or a portion of their notes for cash, which may require the use of a substantial amount of cash. If such
cash is not available, we may be required to sell other assets or enter into alternate financing arrangements at terms that may or may not be desirable. The existence of the convertible
notes and the obligations that we incurred by issuing them may restrict our ability to take advantage of certain future opportunities, such as engaging in future debt or equity financing
activities.

As of December 31, 2022, we had $76.9 million aggregate principal amount of 2023 Notes. The notes are convertible into cash, and if applicable, shares of our common stock
under certain circumstances, including trading price conditions related to our common stock. Upon conversion, we are required to record a gain or loss for the difference between the
fair value of the notes to be extinguished and their corresponding net carrying value. The fair value of the notes to be extinguished depends on our current incremental borrowing rate.
If our incremental borrowing rate at the time of conversion is lower than the implied interest rate of the notes, we will record a loss in our consolidated statement of income during the
period in which the notes are converted.

Impairment charges pertaining to goodwill, identifiable intangible assets or other long-lived assets from our mergers and acquisitions could have an adverse impact on our
results of operations and the market value of our common stock.

The total purchase price pertaining to our acquisitions in recent years have been allocated to net tangible assets, identifiable intangible assets, in-process research and

development and goodwill. To the extent the value of goodwill or identifiable intangible assets or other long-lived assets become impaired, we will be required to incur material
charges relating to the impairment. Any impairment charges could have a material adverse impact on our results of operations and the market value of our common stock.

Our investments are subject to market and credit risks that could diminish their value and these risks could be greater during periods of extreme volatility or disruption in the
financial and credit markets, which could adversely impact our business, financial condition, results of operations, liquidity and cash flows.

Our investments are subject to risks of credit defaults and changes in market values. Periods of macroeconomic weakness or recession, heightened volatility or disruption in the

financial and credit markets could increase these risks, potentially resulting in other than temporary impairment of assets in our investment portfolio. Any event reducing the
estimated fair value of these securities, other than on a temporary basis, could have a material and adverse effect on our business, results of operations, financial condition, liquidity
and cash flows. If our investment manager, fails to react appropriately to difficult market, economic and geopolitical conditions, our investment portfolio could incur material losses.

We have a risk management framework in place to identify, assess and prioritize risks, including the market and credit risks to which our investments are subject. As part of

that framework, we test our investment portfolio based on various market scenarios. Under certain stressed market scenarios, unrealized losses on our investment portfolio could lead
to material reductions in its carrying value.

A decline in fair value below the amortized cost of a security requires management to assess whether an impairment has occurred. The decision on whether to record an
impairment is determined in part by our assessment of the financial condition and prospects of a particular issuer, projections of future cash flows and recoverability of the particular
security as well as management’s assertion of whether it is more likely than not that we will sell the particular security before recovery.

Our charter documents and concentration of ownership may hinder or prevent change of control transactions.

Provisions contained in our certificate of incorporation and bylaws may discourage transactions involving an actual or potential change in our ownership. In addition, our
Board of Directors may issue shares of common or preferred stock without any further action by the stockholders. Our directors, officers and certain of our institutional investors
collectively beneficially own a significant portion of our outstanding common stock. Such provisions and issuances may have the effect of delaying or preventing a change in our
ownership. If changes in our ownership are discouraged, delayed or prevented, it would be more difficult for our current Board of Directors to be removed and replaced, even if you
or our other stockholders believe that such actions are in the best interests of us and our stockholders.

Our amended and restated bylaws provide that the Court of Chancery of the State of Delaware will be the exclusive forum for substantially all disputes between us and 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 amended and restated bylaws provide that the Court of Chancery of the State of Delaware is the 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

33

owed by our directors, officers or other employees to us or our stockholders, (iii) any action asserting a claim arising pursuant to any provision of the General Corporation Law of
Delaware or our amended and restated certificate of incorporation or amended and restated bylaws, or (iv) any action asserting a claim governed by the internal affairs doctrine. To the
extent that any such claims may be based upon federal law claims, Section 27 of the Exchange Act creates exclusive federal jurisdiction over all suits brought to enforce any duty or
liability created by the Exchange Act or the rules and regulations thereunder. Furthermore, Section 22 of the Securities Act provides for concurrent jurisdiction for federal and state
courts over all suits brought to enforce any duty or liability created by the Securities Act or the rules and regulations thereunder, and as such, the exclusive jurisdiction clauses set
forth above would not apply to such suits. The choice of forum provisions in our amended and restated bylaws 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 other
employees. By agreeing to these provisions, however, stockholders will not be deemed to have waived our compliance with the federal securities laws and the rules and regulations
thereunder. Furthermore, the enforceability of similar choice of forum provisions in other companies’ certificates of incorporation and bylaws has been challenged in legal
proceedings, and it is possible that a court could find these types of provisions to be inapplicable or unenforceable. If a court were to find the choice of forum provisions in our
amended and restated bylaws to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other jurisdictions, which could
adversely affect our business and financial condition.

Our stock price has been volatile and could experience a sudden decline in value.

The market prices for securities of biotechnology and pharmaceutical companies have historically been highly volatile, and the market has experienced significant price and
volume fluctuations that are unrelated to the operating performance of particular companies. Continued volatility in the overall capital markets could reduce the market price of our
common stock in spite of our operating performance. Further, high stock price volatility could result in higher share-based compensation expense.

Our common stock has experienced significant price and volume fluctuations and may continue to experience volatility in the future. Many factors may have a significant
impact on the market price of our common stock, including, but not limited to, the following factors: results of or delays in our preclinical studies and clinical trials; the success of our
collaboration agreements; publicity regarding actual or potential medical results relating to products under development by us or others; announcements of technological innovations
or new commercial products by us or others; developments in patent or other proprietary rights by us or others; market perception of the OmniAb spin-off; comments or opinions by
securities analysts or major stockholders or changed securities analysts' reports or recommendations; future sales or shorting of our common stock by existing stockholders; regulatory
developments or changes in regulatory guidance; litigation or threats of litigation; economic and other external factors or other disaster or crises; the departure of any of our officers,
directors or key employees; period-to-period fluctuations in financial results; and price and volume fluctuations in the overall stock market.

Our results of operations and liquidity needs could be materially negatively affected by market fluctuations and economic downturn.

Our results of operations could be materially negatively affected by economic conditions generally, both in the United States and elsewhere around the world. Concerns over
inflation, energy costs, geopolitical issues, military conflicts, including the war between Russia and Ukraine, terrorism, public health emergencies or pandemics, the availability and
cost of credit, and the U.S. financial markets have in the past contributed to, and may continue in the future to contribute to, increased volatility and diminished expectations for the
economy and the markets. Sanctions imposed by the United States and other countries in response to military conflicts, including the war between Russia and Ukraine, may also
adversely impact the financial markets and the global economy, and any economic countermeasures by the affected countries or others could exacerbate market and economic
instability. In addition, the COVID-19 pandemic affected and may continue to affect, and any future epidemic diseases may affect, worldwide equity markets. Domestic and
international equity markets periodically experience heightened volatility and turmoil. These events may have an adverse effect on us. In the event of a market downturn, our results
of operations could be adversely affected by those factors in many ways, including making it more difficult for us to raise funds if necessary, and our stock price may further decline.
We cannot provide assurance that our investments are not subject to adverse changes in market value. If our investments experience adverse changes in market value, we may have
less capital to fund our operations.

Item 1B.

Unresolved Staff Comments

None.

34

 
Item 2.

Properties

The following table summarizes our principal facilities leased as of December 31, 2022, including the location and size of each facility, and their designated use. We believe our

facilities are adequate for our current and near-term needs, and we will be able to locate additional facilities, as needed.

Location
San Diego, CA
Las Vegas, NV
Lawrence, KS

Approximate 

Square Feet
54,000
4,100
3,700

Operation

Corporate headquarter office and laboratory
Office
Office and laboratory

Lease Expiration Date
August 2032
April 2028
August 2032

Item 3.

Legal Proceedings

See “Item 8. Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements—Note (10), Commitments and Contingencies—Legal Proceedings.”

Item 4.

Mine Safety Disclosures

Not applicable.

PART II

Item 5.

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

Our common stock is traded on the Nasdaq Global Market under the symbol “LGND.” As of February 22, 2023, there were approximately 354 holders of record of the

common stock.

Except for 2007, during which we declared a cash dividend on our common stock of $2.50 per share, we have not paid any dividends on our common stock in the past and

currently do not expect to pay cash dividends or make any other distributions on common stock in the future. We expect to retain our future earnings, if any, for use in the operation
and expansion of our business, to pay down debt and potentially for share repurchases. Any future determination to pay dividends on common stock will be at the discretion of our
Board of Directors and will depend upon our financial condition, results of operations, capital requirements and such other factors as the board deems relevant.

During the fiscal year ended December 31, 2022, we did not repurchase any shares of our common stock under the stock repurchase program approved by our Board of

Directors in September 2019, which allowed us to acquire up to $500 million of our common stock in open market and negotiated purchases for a period of up to three years. This
stock repurchase program expired in September 2022.

The information required by Item 201(d) of Regulation S-K is incorporated by reference to the 2023 Annual Meeting Proxy Statement as defined in Item 10 below.

35

 
Performance Graph

The graph below shows the five-year cumulative total stockholder return assuming the investment of $100 and is based on the returns of the component companies weighted

monthly according to their market capitalization. The graph compares total stockholder returns of our common stock, of all companies traded on the Nasdaq Stock market, as
represented by the Nasdaq Composite  Index, and of the Nasdaq Biotechnology Stock Index, as prepared by The Nasdaq Stock Market Inc.

®

The stockholder return shown on the graph below is not necessarily indicative of future performance and we will not make or endorse any predictions as to future stockholder

returns.

Ligand
NASDAQ Composite-Total Return
NASDAQ Biotechnology Index

Value of $100 Invested Over Time

12/31/2017

12/31/2018

12/31/2019

12/31/2020

12/31/2021

12/31/2022

$
$
$

100.00 
100.00 
100.00 

$
$
$

99.10 
97.12 
91.14 

$
$
$

76.16 
132.81 
114.02 

$
$
$

72.63 
192.47 
144.15 

$
$
$

112.80 
235.15 
144.18 

$
$
$

71.62 
158.65 
129.59 

36

Item 6.

[RESERVED]

Item 7.

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

Our Management's Discussion and Analysis of Financial Condition and Results of Operations (MD&A) will help readers understand our results of operations, financial

condition, and cash flows. It is provided in addition to the accompanying consolidated financial statements and notes.

OmniAb Separation and Spin-Off

On March 23, 2022, we entered into the Merger Agreement, by and among our company, Avista Public Acquisition Corp. II (New OmniAb) and OmniAb, Inc., a Delaware

corporation and then wholly-owned subsidiary of our company (OmniAb), and Orwell Merger Sub Inc. (Merger Sub), pursuant to which New OmniAb combined with OmniAb, our
then-antibody discovery business (the OmniAb Business), in a Reverse Morris Trust transaction. Pursuant to the Separation Agreement, we transferred the OmniAb Business,
including certain of our related subsidiaries, to OmniAb and, in connection therewith, distributed (the Distribution) to Ligand stockholders 100% of the common stock of OmniAb.
Immediately following the Distribution on November 1, 2022, in accordance with and subject to the terms and conditions of the Merger Agreement, Merger Sub merged with and into
OmniAb (the Merger), with OmniAb continuing as the surviving company in the Merger and as a wholly-owned subsidiary of New OmniAb. After the Distribution, we do not
beneficially own any shares of common stock in OmniAb and no longer consolidate OmniAb into our financial results for periods ending after October 31, 2022. As a result,
OmniAb's historical financial results through the Separation are reflected in our consolidated financial statements as discontinued operations.

Our MD&A is organized as follows:

•

•

•

•

Results of Operations. Detailed discussion of our revenue and expenses from continuing operations for twelve months ended December 31, 2022, 2021 and 2020.

Liquidity and Capital Resources. Discussion of key aspects of our consolidated statements of cash flows, changes in our financial position, and our financial commitments.

Critical Accounting Policies and Estimates. Discussion of significant changes we believe are important to understand the assumptions and judgments underlying our
consolidated financial statements.

Recent Accounting Pronouncements. For summary of recent accounting pronouncements applicable to our consolidated financial statements, see “Item 8. Financial Statements
and Supplementary Data—Notes to Consolidated Financial Statements—Note (1), Basis of Presentation and Summary of Significant Accounting Policies.”

Results of Operations

Revenue

FY 2022 vs. FY 2021

(Dollars in thousands)
Royalties
Captisol - Core
Captisol - COVID
Contract Revenue

Total revenue

2022

2021

(a)

Change

% Change

$

$

72,527  $
16,429 
88,066 
19,223 
196,245  $

48,927  $
23,423 
140,827 
28,367 
241,544  $

23,600 
(6,994)
(52,761)
(9,144)
(45,299)

48  %
(30) %
(37) %
(32) %

(19) %

(a) Prior period amounts have been retrospectively adjusted to reflect the effects of the Separation.

Total revenue from continuing operations decreased by $45.3 million, or 19%, to $196.2 million in 2022 compared to $241.5 million in 2021 primarily due to the $52.8 million

decrease in sales of COVID-related Captisol. The lower sales were due to reduced demand for remdesivir, a treatment for moderate or severe COVID-19. Core Captisol sales were
$16.4 million

37

for the year ended December 31, 2022, compared with $23.4 million for the same period in 2021. The lower sales were due to the timing of customer orders. Royalty revenue
increased by $23.6 million, or 48%, to $72.5 million in 2022 as compared to $48.9 million for the same period in 2021. The increase in royalty revenue is driven primarily by increases
in sales of drugs using the Pelican platform - Rylaze, Pneumosil and Teriparatide, along with an increase in sales of Kyprolis. Contract revenue decreased year over year in 2022 by
$9.1 million primarily due to the timing of partner milestone events.

FY 2021 vs. FY 2020

(Dollars in thousands)
Royalties
Captisol - Core
Captisol - COVID
Contract Revenue

Total revenue

2021

(a)

2020

(a)

Change

% Change

$

$

48,927  $
23,423 
140,827 
28,367 
241,544  $

33,796  $
24,566 
85,393 
19,807 
163,562  $

15,131 
(1,143)
55,434 
8,560 
77,982 

45  %
(5) %
65  %
43  %

48  %

(a) Prior period amounts have been retrospectively adjusted to reflect the effects of the Separation.

Total revenue from continuing operations increased by $78.0 million, or 48%, to $241.5 million in 2021 compared to $163.6 million in 2020 primarily due to the $55.4 million

increase in sales of COVID-related Captisol. The higher sales were due to increased demand for remdesivir, a treatment for moderate or severe COVID-19. Core Captisol sales were
$23.4 million for the year ended December 31, 2021, compared with $24.6 million for the same period in 2020. The lower sales were due to the timing of customer orders. Royalty
revenue increased by $15.1 million, or 45%, to $48.9 million in 2021 as compared to $33.8 million for the same period in 2020. The increase in royalty revenue was driven primarily
by the royalties from the sale of drugs using the Pelican platform - Rylaze, Pneumosil and Teriparatide. Contract revenue increased year over year in 2021 by $8.6 million primarily
due to the timing of partner milestone events.

Royalty revenue is a function of our partners' product sales and the applicable royalty rate. Kyprolis royalty rate is under a tiered royalty rate structure with the highest being
3.0%. Evomela has a contractually fixed royalty rate of 20%. Teriparatide injection has a tiered gross profit share between 25% and 40% on sales that have been adjusted for certain
deductible items as defined in the respective license agreement. The Rylaze royalty rate is in the low single digits. Contract revenue includes service revenue, license fees and
development, regulatory and sales based milestone payments.

The following table represents royalty revenue by program:

(in millions)
Kyprolis
Evomela
Teriparatide injection
Rylaze
Other

(1)

Total

2022 Estimated
Partner Product Sales

Effective Royalty

Rate

2022 Royalty

Revenue

2021 Estimated
Partner Product Sales

Effective Royalty

Rate

2021 Royalty

Revenue

$

$

1,275.6 
51.0 
47.2 
278.7 
383.7 
2,036.2 

2.4%
20.0%
33.5%
3.2%
2.0%

$

$

30.1 
10.2 
15.8 
8.8 
7.6 
72.5 

$

$

1,148.9 
50.5 
12.9 
80.7 
195.1 
1,488.1 

2.4%
20.0%
41.1%
3.0%
1.8%

$

$

27.5 
10.1 
5.3 
2.4 
3.6 
48.9 

(1) - Teriparatide injection sales have been adjusted for certain deductible items as defined in the respective license agreement, and the royalty revenue is based on a tiered gross profit share.

Operating Costs and Expense

FY 2022 vs. FY 2021

38

(Dollars in thousands)
Cost of Captisol
Amortization of intangibles
Research and development
General and administrative
Other operating income

Total operating costs and expenses

2022

2021

(a)

Change

% Change

$

$

52,827 
34,237 
36,082 
70,062 
— 
193,208 

$

$

62,176 
34,222 
32,105 
46,790 
(37,600)
137,693 

$

$

(9,349)
15 
3,977 
23,272 
37,600 
55,515 

(15)%
— %
12 %
50 %
(100)%

40 %

(a) Prior period amounts have been retrospectively adjusted to reflect the effects of the Separation.

Total operating costs and expenses from continuing operations for 2022 increased $55.5 million or 40% compared with 2021.

Cost of Captisol decreased year over year in 2022 primarily due to lower sales of Captisol during 2022, partially offset by the capacity ramp-up right of use asset impairment of

$9.8 million recorded in the fourth quarter of 2022.

Amortization of intangibles remained steady in 2022 compared to 2021 as there have been no significant changes to the gross balance of intangible assets over these periods.

At any one time, we are working on multiple programs. As such, we generally do not track our R&D expenses on a specific program basis. Our R&D expenses increased by

$4.0 million in 2022 compared to 2021 due to higher employee-related expenses and increased facility related expenses.

General and administrative expenses increased by $23.3 million in 2022 compared to 2021 primarily due to increases in stock compensation expense including a one-time

charge associated with the retirement of our former CEO in the fourth quarter of 2022, headcount-related expenses and legal expenses.

Other operating income in 2021 was due to reducing the fair value of the CVR liability associated to the acquisition of Pfenex to zero, as the CVR payment expiration date

passed on December 31, 2021 without achieving the triggering event. We did not have any other operating income in 2022.

FY 2021 vs. FY 2020

(Dollars in thousands)
Cost of Captisol
Amortization of intangibles
Research and development
General and administrative
Other operating income

Total operating costs and expenses

2021

(a)

2020

(a)

Change

% Change

$

$

62,176 
34,222 
32,105 
46,790 
(37,600)
137,693 

$

$

30,419 
11,642 
40,503 
60,012 
600 
143,176 

$

$

31,757 
22,580 
(8,398)
(13,222)
(38,200)
(5,483)

104 %
194 %
(21)%
(22)%
(6,367)%

(4)%

(a) Prior period amounts have been retrospectively adjusted to reflect the effects of the Separation.

Total operating costs and expenses from continuing operations for 2021 decreased $5.5 million or 4% compared with 2020.

Cost of Captisol increased year over year in 2021 primarily due to higher sales of Captisol during 2021.

Amortization of intangibles increased year over year in 2021 primarily due to the acquisition of Pfenex in October 2020.

At any one time, we are working on multiple programs. As such, we generally do not track our R&D expenses on a specific program basis. Our R&D expenses decreased year

over year in 2021 due to the sale of Vernalis R&D in October 2020.

General and administrative expenses decreased by $13.2 million in 2022 compared to 2021 primarily due to $20.7 million in acquisition and integration related costs in 2021

associated with the Pfenex acquisition in 2020. The decrease was partially offset by additional headcount related expenses in 2021.

Other operating income in 2021 was due to reducing the fair value of the CVR liability associated to the acquisition of Pfenex to zero, as the CVR payment expiration date

passed on December 31, 2021 without achieving the triggering event.

We do not provide forward-looking estimates of costs and time to complete our ongoing research and development projects as such estimates would involve a high degree of

uncertainty. Uncertainties include our inability to predict the outcome

39

of research and clinical studies, regulatory requirements placed upon us by regulatory authorities such as the FDA and EMA, our inability to predict the decisions of our partners, our
ability to fund research and development programs, competition from other entities of which we may become aware in future periods, predictions of market potential for products that
may be derived from our work, and our ability to recruit and retain personnel or third-party contractors with the necessary knowledge and skills to perform certain research. Refer to
“Item 1A. Risk Factors” for additional discussion of the uncertainties surrounding our research and development initiatives.

Other income (expense)

FY 2022 vs. FY 2021
(Dollars in thousands)
Gain (loss) from short-term investments
Interest income
Interest expense
Other expense, net

Total other income (expense), net

2022

2021

(a)

Change

$

$

28,540 
2,046 
(1,799)
4,187 
32,974 

$

$

(5,263)
886 
(19,619)
(7,650)
(31,646)

$

$

33,803 
1,160 
17,820 
11,837 
64,620 

% Change
642 
131 
91 
155 

204 

%
%
%
%

%

(a) Prior period amounts have been retrospectively adjusted to reflect the effects of the Separation.

The fluctuation in the gain (loss) from short-term investments is primarily driven by the changes in the fair value of our ownership in Viking common stock (an unrealized gain

of $32.2 million in 2022 as compared to an unrealized loss of $9.6 million in 2021).

Interest income consists primarily of interest earned on our short-term investments. The year over year increase in 2022 is primarily due to the significant interest rate increases

by the federal reserve during 2022.

Interest expense includes the 0.75% coupon cash interest expense in addition to the non-cash accretion of discount (including the amortization of debt issuance costs) on our

2023 Notes. The year over year decrease was primarily due to the adoption of ASU 2020-06 which significantly reduced the debt discount balance subject to amortization. See
additional information in “Item 8. Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements—Note (1), Basis of Presentation and Summary of
Significant Accounting Policies.” In addition, we carried a lower average debt outstanding balance during 2022 as compared 2021. During 2022, we repurchased $266.4 million in
principal of the 2023 Notes for $261.4 million in cash, including accrued interest of $0.5 million. See additional information in “Item 8. Financial Statements and Supplementary Data
—Notes to Consolidated Financial Statements—Note (7), Convertible Senior Notes.”

Other expense, net, increased year over year in 2022 primarily due to a $4.2 million gain on our debt extinguishments in 2022 compared to $7.3 million loss on debt

extinguishments in 2021. See additional information in “Item 8. Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements—Note (7), Convertible
Senior Notes.”

FY 2021 vs. FY 2020
(Dollars in thousands)
Gain (loss) from short-term investments
Interest income
Interest expense
Other expense, net

Total other income (expense), net

2021

(a)

2020

(a)

Change

$

$

(5,263)
886 
(19,619)
(7,650)
(31,646)

$

$

(16,933)
8,078 
(27,415)
62 
(36,208)

$

$

11,670 
(7,192)
7,796 
(7,712)
4,562 

% Change
(69)
(89)
28 
12439 

13 

%
%
%
%

%

(a) Prior period amounts have been retrospectively adjusted to reflect the effects of the Separation.

The fluctuation in the gain (loss) from short-term investments is primarily driven by the changes in the fair value of our ownership in Viking common stock (an unrealized loss

of $9.6 million in 2021 as compared to an unrealized loss of $19.0 million in 2020).

Interest income consists primarily of interest earned on our short-term investments. The year over year decrease in 2021 resulted from the decrease in our short-term

investment balances due to the usage of funds for the 2023 Notes repurchases.

40

Interest expense includes the 0.75% coupon cash interest expense in addition to the non-cash accretion of discount (including the amortization of debt issuance costs) on our
2023 Notes. The year over year decrease in 2021 was primarily due to lower average debt outstanding balance as compared to the prior year. During 2021, we repurchased $152.0
million in principal of the 2023 Notes for $156.0 million in cash, including accrued interest of $0.3 million. See “Item 8. Financial Statements and Supplementary Data—Notes to
Consolidated Financial Statements—Note (7), Convertible Senior Notes.”

Other expense, net, increased year over year in 2021 primarily due to a $7.3 million loss on our debt extinguishments compared to $2.5 million loss on debt extinguishments in

2020. See additional information in “Item 8. Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements—Note (7), Convertible Senior Notes.”

Income tax benefit (expense)

FY 2022 vs. FY 2021

(Dollars in thousands)
Income before income tax expense (benefit) from continuing operations
Income tax benefit (expense)

Net income (loss) from continuing operations
Effective Tax Rate

$

$

2022

36,011 
(41,230)
(5,219)

$

$

114 %

2021

Change

% Change

72,205 
4,148 
76,353 

$

$

(6)%

(36,194)
(45,378)
(81,572)

(50)%
(1,094)%

(107)%

Our effective tax rate for 2022 and 2021 was 114% and (6)%, respectively. Our tax rate is affected by recurring items, such as the U.S. federal and state statutory tax rates and
the relative amounts of income we earn in those jurisdictions, which we expect to be fairly consistent in the near term. It is also affected by discrete items that may occur in any given
year, but are not consistent from year to year. In 2022, the variance from the U.S. federal statutory rate of 21% was primarily due to limitations on the deductibility of stock-based
compensation for certain officers and a discrete tax expense of $24.8 million related to the valuation allowance established during the fourth quarter of 2022 against deferred tax
assets for California research and development credits and net operating losses. Beginning in 2022, the Tax Cuts and Jobs Act of 2017 requires taxpayers to capitalize and amortize
R&D expenditures over five years for domestic research and fifteen years for foreign research pursuant to Section 174 of the Internal Revenue Code of 1986, as amended. We
recorded an increase of $4.7 million to our current federal income tax expense and deferred tax assets for continuing operations during 2022 due to the capitalization of R&D under
Section 174. In 2021, the variance from the U.S. federal statutory rate of 21% was attributable to the mix of earnings in jurisdictions with lower statutory rates than the U.S. federal
statutory tax rate, and excess benefits from shared-based compensation. The items below also had an impact on the difference between our statutory U.S. rate.

2022
•
•
•
•

2021
•

•
•
•
•
•
•

$24.8 million (68.9%) increase from valuation allowance adjustments
$5.9 million (16.3%) increase from Section 162(m) limitation
$2.4 million (6.7%) decrease from the foreign-derived intangible income deduction
$1.3 million (3.6%) increase due to excess tax benefits from share-based compensation which are recorded as a discrete item within the provision for income tax
pursuant to ASU 2016-09

$12.1 million (16.7%) decrease due to excess tax benefits from share-based compensation which are recorded as a discrete item within the provision for income tax
pursuant to ASU 2016-09
$11.2 million (15.6%) increase from valuation allowance adjustments
$8.1 million (11.1%) decrease from tax rate and law changes in the United Kingdom
$8.0 million (11.1%) decrease due to the revaluation of contingent value rights
$3.2 million (4.5%) increase from Section 162(m) limitation
$3.1 million (4.3%) decrease from net operating loss carryforwards and credit adjustments
$1.6 million (2.3%) decrease from research and development tax credits

Net Loss from Discontinued Operations

Net loss from discontinued operations for the years ended December 31, 2022, 2021 and 2020 was $28.1 million, $19.2 million and $9.6 million, respectively. See additional

information in “Item 8. Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements—Note (2), Spin-off Of OmniAb.”

41

Liquidity and Capital Resources

At December 31, 2022, we had approximately $211.9 million in cash, cash equivalents, and short-term investments. Cash and cash equivalents and short-term investments

decreased by $129.2 million from last year, due to factors described in the “Cash Flow Summary” below. Our primary source of liquidity, other than our holdings of cash, cash
equivalents, and investments, which decreased during 2022 primarily from extinguishment of debt, has been cash flows from operations. Our ability to generate cash from operations
provides us with the financial flexibility we need to meet operating, investing, and financing needs.

Historically, we have liquidated our short-term investments and/or issued debt and equity securities to finance our business needs as a supplement to cash provided by operating

activities. Our short-term investments include U.S. government debt securities, investment-grade corporate debt securities, mutual funds and certificates of deposit. We have
established guidelines relative to diversification and maturities of our investments in order to provide both safety and liquidity. These guidelines are periodically reviewed and
modified to take advantage of trends in yields and interest rates. Additionally, we own certain securities which are classified as short-term investments that we received as a result of a
milestone and an upfront license payment as well as 6.7 million shares of common stock in Viking.

On September 30, 2022, we entered into an At-The-Market Equity Offering Sales Agreement (Sales Agreement) with Stifel, Nicolaus & Company, Incorporated (Agent),

under which we may, from time to time, sell shares of our common stock having an aggregate offering price of up to $100.0 million in “at the market” offerings through the Agent
(ATM Offering). The shelf registration statement relating to such shares included a prospectus covering the offering, issuance and sale of up to $100.0 million of our common stock
from time to time through the ATM Offering. The shares to be sold under the Sales Agreement may be issued and sold pursuant to the shelf registration statement. As of December
31, 2022 we have not issued any shares of common stock in the ATM Offering.

In May 2018, we issued the 2023 Notes with an aggregate principal amount of $750.0 million. A portion of the proceeds from such issuance totaling $49.7 million were used to

repurchase 260,000 shares of our common stock. During 2021 and 2020, we repurchased $406.7 million in principal of the 2023 Notes for $378.8 million in cash, including accrued
interest of $0.9 million. During 2022, we repurchased $266.4 million in principal of the 2023 Notes for $261.4 million in cash, including accrued interest of $0.5 million. After the
repurchases, $76.9 million in principal amount of the 2023 Notes remain outstanding as of December 31, 2022.

We may continue to use cash on hand to repurchase additional 2023 Notes through open-market transactions, including through a Rule 10b5-1 trading plan to facilitate open-

market repurchases, or otherwise, from time to time. The timing and amount of repurchase transactions will be determined by management based on the evaluation of market
conditions, trading price of the 2023 Notes, legal requirements and other factors. The 2023 Notes were not convertible as of December 31, 2022. It is our intent and policy to settle
conversions through combination settlement, which essentially involves payment in cash equal to the principal portion and delivery of shares of common stock for the excess of the
conversion value over the principal portion. See detail in “Item 8. Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements—Note (7),
Convertible Senior Notes.”

We are obligated to make payments to operating leases, including rental commitments on leases that have not yet commenced. For information on these obligations, see detail

in “Item 8. Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements—Note (6), Leases.”

We also have commitments under our supply agreement with Hovione for Captisol purchases. The total purchase obligation as of December 31, 2022 was $28.7 million, of

which $9.6 million is expected to be paid within a year and the remaining amount is expected to be paid between 1 to 3 years.

In September 2019, our Board of Directors approved a stock repurchase program authorizing the repurchase of up to $500.0 million of our common stock from time to time

over a period of up to three years. Our prior $350.0 million stock repurchase program was terminated in connection with the approval of the new stock repurchase program. Our
$500.0 million stock repurchase program expired in September 2022, and as of December 31, 2022 we do not have a repurchase program in place. See “Item 5. Market for
Registrant's Common Equity, Related Stockholder Matters, and Issuer Purchase of Equity Securities.”

We believe that existing funds, cash generated from operations and existing sources of and access to financing are adequate to satisfy our needs for working capital; capital

expenditure and debt service requirements; continued advancement of research and development efforts; potential stock repurchases; and other business initiatives we plan to
strategically pursue, including acquisitions and strategic investments.

As of December 31, 2022, we had $3.5 million in fair value of contingent consideration liabilities associated with the acquisitions to be settled in future periods.

42

Cash Flow Summary
(in thousands)
Net cash provided by (used in):
     Operating activities
     Investing activities
     Financing activities

2022

2021

2020

$
$
$

137,850 
163,624 
(275,990)

$
$
$

78,798 
30,523 
(137,761)

$
$
$

54,586 
231,648 
(310,545)

In 2022, we generated cash from operations primarily from collections on our trade receivables. We generated cash from investing activities primarily from sale and maturity

of short-term investments. During the year, we used cash for financing activities, including the payments related to the extinguishment of certain 2023 Notes.

In 2021, we generated cash from operations primarily due to the increase in net income. We generated cash from investing activities primarily from sale and maturity of short-
term investments. During the year, we used cash for financing activities, including the payments related to the extinguishment of certain 2023 Notes, partially offset by cash received
from issuance of common stock under employee stock plans and bond hedge settlement.

In 2020, we generated cash from operations primarily due to cash inflows from changes in deferred revenue. We generated cash from investing activities primarily from sale
and maturity of short-term investments as well as the sale of the Vernalis R&D business; partially offset by cash used for the acquisition of Pfenex, and three additional acquisitions
that are part of our discontinued operations, Icagen, xCella and Taurus. During the year, we used cash for financing activities, including the payments related to the extinguishment of
certain 2023 Notes and stock repurchases.

Critical Accounting Policies and Estimates

The preparation of financial statements in conformity with GAAP requires estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and

expenses, and related disclosures of contingent liabilities in the consolidated financial statements and accompanying notes. The SEC has defined a company’s critical accounting
policies as the ones that are most important to the portrayal of the company’s financial condition and results of operations, and which require the company to make its most difficult
and subjective judgments, often as a result of the need to make estimates of matters that are inherently uncertain. Based on this definition, we have identified the critical accounting
policies and judgments addressed below. We also have other key accounting policies, which involve the use of estimates, judgments, and assumptions that are significant to
understanding our results. For additional information, see “Item 8. Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements—Note (1), Basis of
Presentation and Summary of Significant Accounting Policies.” Although we believe that our estimates, assumptions, and judgments are reasonable, they are based upon information
presently available. Actual results may differ significantly from these estimates under different assumptions, judgments, or conditions.

Revenue Recognition

We apply the following five-step model in accordance with ASC 606 in order to determine the revenue: (i) identification of the promised goods or services in the contract; (ii)

determination of whether the promised goods or services are performance obligations, including whether they are distinct in the context of the contract; (iii) measurement of the
transaction price, including the constraint on variable consideration; (iv) allocation of the transaction price to the performance obligations; and (v) recognition of revenue when (or as)
the Company satisfies each performance obligation.

We receive royalty revenue on sales by our partners of products covered by patents that we or our partners own under contractual agreements. We do not have future
performance obligations under these license arrangements. We generally satisfy our obligation to grant intellectual property rights on the effective date of the contract. However, we
apply the royalty recognition constraint required under the guidance for sales-based royalties which requires a royalty to be recorded no sooner than the underlying sale occurs.
Therefore, royalties on sales of products commercialized by our partners are recognized in the quarter the product is sold. Our partners generally report sales information to us on a one
quarter lag. Thus, we estimate the expected royalty proceeds based on an analysis of historical experience and interim data provided by our partners including their publicly
announced sales. Differences between actual and estimated royalty revenues are adjusted in the period in which they become known, typically the following quarter.

Our contracts with customers often will include variable consideration in the form of contingent milestone-based payments. We include contingent milestone based payments

in the estimated transaction price when it is probable a significant reversal in the amount of cumulative revenue recognized will not occur. These estimates are based on historical
experience,

43

anticipated results and our best judgment at the time. If the contingent milestone based payment is sales-based, we apply the royalty recognition constraint and record revenue when
the underlying sale has taken place. Significant judgments must be made in determining the transaction price for our sales of intellectual property. Because of the risk that products in
development with our partners will not reach development based milestones or receive regulatory approval, we generally recognize any contingent payments that would be due to us
upon the occurrence of the development milestone or regulatory approval. Depending on the terms of the arrangement, we may also defer a portion of the consideration received if we
have to satisfy a future obligation, which typically occurs with our contracts for R&D services.

For R&D services we recognize revenue over time and we measure our progress using an input method. The input methods we use are based on the effort we expend or costs

we incur toward the satisfaction of our performance obligation. We estimate the amount of effort we expend, including the time it will take us to complete the activities, or the costs we
may incur in a given period, relative to the estimated total effort or costs to satisfy the performance obligation. This results in a percentage that we multiply by the transaction price to
determine the amount of revenue we recognize each period. This approach requires us to make numerous estimates and use significant judgement. If our estimates or judgements
change over the course of the collaboration, they may affect the timing and amount of revenue that we recognize in the current and future periods.

Revenue from Captisol sales is recognized when control of Captisol material or intellectual property license rights is transferred to our customers in an amount that reflects the

consideration we expect to receive from our customers in exchange for those products. A performance obligation is considered distinct from other obligations in a contract when it
provides a benefit to the customer either on its own or together with other resources that are readily available to the customer and is separately identified in the contract. For Captisol
material, we consider our performance obligation is satisfied at a point in time, once we have transferred control of the product, meaning the customer has the ability to use and obtain
the benefit of the Captisol material or intellectual property license right. We recognize revenue for satisfied performance obligations only when we determine there are no uncertainties
regarding payment terms or transfer of control. Sales tax and other taxes we collect concurrent with revenue-producing activities are excluded from revenue. We have elected to
recognize the cost of freight and shipping when control over Captisol material has transferred to the customer as an expense in Cost of Captisol. We expense incremental costs of
obtaining a contract when incurred if the expected amortization period of the asset that we would have recognized is one year or less or the amount is immaterial. We did not incur any
incremental costs of obtaining a contract during the periods reported.

We occasionally have sub-license obligations related to arrangements for which we receive license fees, milestones and royalties. We evaluate the determination of gross as a

principal versus net as an agent reporting based on each individual agreement.

Goodwill and Intangible Assets — Impairment Assessments

Goodwill

Goodwill is evaluated annually for impairment using either a quantitative or qualitative analysis. Goodwill is tested for impairment at the reporting unit level, and is based on

the net assets for each reporting unit, including goodwill and intangible assets. Goodwill is assigned to each reporting unit, as this represents the lowest level that constitutes a
business and is the level at which management regularly reviews the operating results. The Company performs a quantitative analysis using a discounted cash flow model and other
valuation techniques, but may elect to perform a qualitative analysis. In addition, goodwill is evaluated for impairment whenever an event occurs or circumstances change that would
indicate that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. Events or circumstances that may result in an impairment review include
changes in macroeconomic conditions, industry and market considerations, cost factors, overall financial performance, other relevant entity-specific events, specific events affecting
the reporting unit or sustained decrease in share price.

The annual goodwill impairment test was performed using a qualitative analysis in 2022 and 2021. A qualitative analysis is performed by assessing certain trends and factors,

including projected market outlook and growth rates, forecasted and actual sales and operating profit margins, discount rates, industry data, and other relevant qualitative factors.
These trends and factors are compared to, and based on, the assumptions used in the most recent quantitative analysis performed for each reporting unit. The results of the qualitative
analyses did not indicate a need to perform quantitative analysis.

Goodwill impairment testing was performed using quantitative analyses in 2022 for the OmniAb business and Ligand core business due to the reorganization of the Company’s
business discussed in “Item 8. Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements—Note (2), Spin-off of OmniAb.” We used the relative fair
value method to reallocate goodwill.

Intangible Assets

44

We regularly perform reviews to determine if an event occurred that may indicate the carrying values of our intangible assets are impaired. If indicators of impairment exist, we

assess the recoverability of the affected long-lived assets by comparing its carrying amounts to its undiscounted cash flows. If the affected assets are not recoverable, we estimate the
fair value of the assets and record an impairment loss if the carrying value exceeds the fair value. Factors that may indicate potential impairment include a significant decline in our
stock price and market capitalization compared to net book value, significant changes in the ability of an asset to generate positive cash flows and the pattern of utilization of a
particular asset.

In order to estimate the fair value of identifiable intangible assets, we estimate the present value of future cash flows from those assets. The key assumptions that we use in our

discounted cash flow model are the amount and timing of estimated future cash flows to be generated by the asset over an extended period of time and a rate of return that considers
the relative risk of achieving the cash flows, the time value of money, and other factors that a willing market participant would consider. Significant judgment is required to estimate
the amount and timing of future cash flows and the relative risk of achieving those cash flows.

Assumptions and estimates about future values and remaining useful lives are complex and often subjective. They can be affected by a variety of factors, including external
factors such as industry and economic trends, and internal factors such as changes in our business strategy and our internal forecasts. For example, if our future operating results do
not meet current forecasts or if we experience a sustained decline in our market capitalization that is determined to be indicative of a reduction in fair value of our reporting unit, we
may be required to record future impairment charges for purchased intangible assets. Impairment charges could materially decrease our future net income and result in lower asset
values on our balance sheet.

Income Taxes

Our provision for income taxes, deferred tax assets and liabilities, and reserves for unrecognized tax benefits reflect our best assessment of estimated future taxes to be paid.

Significant judgments and estimates based on interpretations of existing tax laws or regulations in the United States are required in determining our provision for income taxes.
Changes in tax laws, statutory tax rates, and estimates of our future taxable income could impact the deferred tax assets and liabilities provided for in the consolidated financial
statements and would require an adjustment to the provision for income taxes.

Deferred tax assets are regularly assessed to determine the likelihood they will be recovered from future taxable income. A valuation allowance is established when we believe
it is more likely than not the future realization of all or some of a deferred tax asset will not be achieved. In evaluating our ability to recover deferred tax assets within the jurisdiction
which they arise, we consider all available positive and negative evidence. Factors reviewed include the cumulative pre-tax book income for the past three years, scheduled reversals
of deferred tax liabilities, our history of earnings and reliability of our forecasts, projections of pre-tax book income over the foreseeable future, and the impact of any feasible and
prudent tax planning strategies.

We recognize the impact of a tax position in our financial statements only if that position is more likely than not of being sustained upon examination by taxing authorities,
based on the technical merits of the position. Tax authorities regularly examine our returns in the jurisdictions in which we do business and we regularly assess the tax risk of our
return filing positions. Due to the complexity of some of the uncertainties, the ultimate resolution may result in payments that are materially different from our current estimate of the
tax liability. These differences, as well as any interest and penalties, will be reflected in the provision for income taxes in the period in which they are determined.

Share-Based Compensation

We measure and recognize compensation expense for all share-based payments, including restricted stock, ESPP and stock options, based on the estimated fair value.
Restricted stock unit (RSU) and performance stock unit (PSU) are all considered restricted stock. The fair value of restricted stock is determined by the closing market price of our
common stock on the date of grant. We recognize share-based compensation expense based on the fair value on a straight-line basis over the requisite service periods of the awards,
taking into consideration of forfeitures as they occur. A PSU generally represents a right to receive a certain number of shares of common stock based on the achievement of corporate
performance goals and continued employment during the vesting period. At each reporting period, we reassess the probability of the achievement of such corporate performance goals
and any expense change resulting from an adjustment in the estimated shares to be released are treated as a cumulative catch-up in the period of adjustment. A limited amount of
PSUs contain a market condition dependent upon the Company’s relative and absolute total stockholder return over a three-year period, with a range of 0% to 200% of the target
amount granted to be issued under the award. Share-based compensation expense for these PSUs is measured using the Monte-Carlo simulation valuation model and is not adjusted
for the achievement, or lack thereof, of the market conditions.

Conversion and Modification of Equity Awards Outstanding at Separation Date

In connection with the OmniAb Separation on November 1, 2022, under the provisions of the existing plans, we adjusted our outstanding equity awards in accordance with the
Merger Agreement to preserve the intrinsic value of the awards immediately before and after the Distribution. Upon the Distribution, employees holding stock options, restricted stock
units

45

and performance restricted stock units denominated in pre-Distribution Ligand stock received a number of otherwise-similar awards either in post-Distribution Ligand stock or in a
combination of post-Distribution Ligand stock and OmniAb stock based on conversion ratios outlined for each group of employees in the Merger Agreement that we entered into in
connection with the Distribution. The equity awards that were granted prior to March 2, 2022 were converted under the shareholder method, wherein employees holding outstanding
equity awards received equity awards in both Ligand and OmniAb. For equity awards granted after March 2, 2022, for Ligand employees, the number of awards that were outstanding
at the Separation were proportionately adjusted into post-Distribution Ligand stock to maintain the aggregate intrinsic value of the awards at the date of the Separation; for OmniAb
employees, the number of awards that were outstanding at the Separation were proportionately adjusted into post-Distribution OmniAb stock to maintain the aggregate intrinsic value
of the awards at the date of the Separation. The conversion ratio was determined based on the relative values of Ligand common stock in the “regular way” and “ex-distribution”
markets during the five-trading day period prior to the closing of the business combination.

These modified awards otherwise retained substantially the same terms and conditions, including term and vesting provisions. Additionally, we will not incur any future

compensation cost related to equity awards held by OmniAb employees and directors. We will incur future compensation cost related to OmniAb equity awards held by our
employees.

Recent Accounting Pronouncements

For the summary of recent accounting pronouncements applicable to our consolidated financial statements, see “Item 8. Financial Statements and Supplementary Data—Notes

to Consolidated Financial Statements—Note (1), Basis of Presentation and Summary of Significant Accounting Policies.”

Item 7A.

Quantitative and Qualitative Disclosures About Market Risk

We are exposed to market risk from interest rates and equity prices which could affect our results of operations, financial condition and cash flows. We manage our exposure to

these market risks through our regular operating and financing activities.

Investment Portfolio Risk

At December 31, 2022, our investment portfolio included investments in available-for-sale securities of $166.9 million, including the investment in Viking common stock of

$63.1 million. These securities are subject to market risk and may decline in value based on market conditions.

Equity Price Risk

Our 2023 Notes include conversion and settlement provisions that are based on the price of our common stock at conversion or maturity of the notes, as applicable. As of

December 31, 2022, the “if-converted value” did not exceed the principal amount of the 2023 Notes. See detail in “Item 8. Financial Statements and Supplementary Data—Notes to
Consolidated Financial Statements—Note (7), Convertible Senior Notes.”

Foreign Currency Risk

Through our licensing and business operations, we are exposed to foreign currency risk. Foreign currency exposures arise from transactions denominated in a currency other
than the functional currency and from foreign denominated revenues and profit translated into U.S. dollars. Our license partners sell our products worldwide in currencies other than
the U.S. dollar. Because of this, our revenues from royalty payments are subject to risk from changes in exchange rates.

We purchase Captisol from Hovione, located in Lisbon, Portugal. Payments to Hovione are denominated and paid in U.S. dollars; however, the unit price of Captisol contains
an adjustment factor which is based on the sharing of foreign currency risk between the two parties. The effect of an immediate 10% change in foreign exchange rates would not have
a material impact on our financial condition, results of operations or cash flows. We do not currently hedge our exposures to foreign currency fluctuations.

Interest Rate Risk

We are exposed to changes in interest rates related primarily to our investment portfolio. Our investment policy and strategy are focused on the preservation of capital and

supporting our liquidity requirements. We use a combination of internal and external management to execute our investment strategy. We typically invest in highly rated securities,
with the primary objective of minimizing the risk of principal loss. Our investment policy generally requires securities to be investment grade and limits the amount of credit exposure
to any one issuer. We have historically maintained a relatively short average maturity for our investment portfolio, and we believe a hypothetical 100 basis point adverse move in
interest rates across all maturities would not materially impact the fair market value of the portfolio in either period.

46

Item 8.

Consolidated Financial Statements and Supplementary Data

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

Report of Independent Registered Public Accounting Firm (PCAOB ID: 42)
Consolidated Balance Sheets
Consolidated Statements of Operations
Consolidated Statements of Comprehensive Income (Loss)
Consolidated Statements of Stockholders’ Equity
Consolidated Statements of Cash Flows
Notes to Consolidated Financial Statements

Page

48
50
50
51
53
53
55

47

 
To the Stockholders and the Board of Directors of Ligand Pharmaceuticals Incorporated

Opinion on the Financial Statements

Report of Independent Registered Public Accounting Firm

We have audited the accompanying consolidated balance sheets of Ligand Pharmaceuticals Incorporated (the Company) as of December 31, 2022 and 2021, and the related
consolidated statements of operations, comprehensive income (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 February 28, 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 Matter

The critical audit matters communicated below are matters arising from the current period audit of the financial statements that were communicated or required to be communicated to
the audit committee and that: (1) relate 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 matters 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 matters below, providing separate opinions on the critical audit matter or on the accounts or disclosures to which they relate.

48

Description of the Matter

How We Addressed the
Matter in Our Audit

Impairment assessment of finite-lived intangibles
At December 31, 2022, the Company’s finite-lived intangible assets totaled $342.5 million. As discussed in Note 1 to the consolidated financial
statements, the Company reviews finite-lived intangible assets for impairment whenever events or changes in circumstances indicate the carrying
amount may not be recoverable. The Company did not identify indicators of impairment for its finite-lived intangibles at December 31, 2022.

Auditing management’s assessment of impairment is challenging due to the degree of subjective auditor judgment necessary in evaluating
management’s process to identify potential indicators of impairment and the related assessment of the severity of such indicators in determining
whether a triggering event has occurred. A high degree of auditor judgment was required to evaluate potential triggering events which included
market conditions, industry and economic trends, changes in regulations, clinical success and historical and forecasted financial results. The
evaluation of triggering events could have a significant effect on the Company’s impairment assessment and the determination of whether further
quantitative analysis of finite-lived intangible assets was required.
We obtained an understanding of management’s process to identify indicators of impairment, including the qualitative analysis and related inputs
and assumptions used in performing the analyses. We evaluated the design and tested the operating effectiveness of the controls that address the
identification of indicators of impairment. For example, we tested controls over management’s assessment of indicators of impairment.

To test the Company’s evaluation of indicators of impairment for finite-lived intangibles, our audit procedures included, among others, assessing
the methodologies and testing the completeness and accuracy of the Company’s analysis of events or changes in circumstances. As part of our
evaluation, we considered market conditions, industry and economic trends, changes in regulations, clinical success and historical and forecasted
financial results, in assessing whether an indicator of impairments exists.

Description of the Matter

Assigning Goodwill in connection with the spin off of the OmniAb business 
As discussed in Note 2 to the consolidated financial statements, in March 2022, the Company entered an agreement to spin off the Company's
OmniAb business. Coinciding with the signing of the agreement, the Company reorganized its reporting structure requiring the assignment of
goodwill from the existing reporting unit to two reporting units. Management assigned goodwill using a relative fair value allocation which resulted
in goodwill of $75.5 million being allocated to the OmniAb business. 

How We Addressed the
Matter in Our Audit

Auditing management’s assignment of goodwill was complex due to the significant judgement used by management when developing the fair value
measurement of the reporting units, including the subjectivity involved in the selection of key assumptions related to estimating revenue and
discount rates.
We obtained an understanding, evaluated the design and tested the operating effectiveness of controls over the Company’s assignment of goodwill
based on the relative fair value of reporting units. For example, we tested controls over management’s determination of reporting units and
management’s review of the significant assumptions described above along with the completeness and accuracy of the data used in these fair value
estimates.

To test the estimated fair value of the reporting units, our audit procedures included, among others, (i) assessing the suitability and application of
the valuation methodologies selected, (ii) evaluating the significant assumptions, discussed above, and (iii) testing the underlying data used by the
Company in its analysis. For example, we compared the significant assumptions used by management, to current industry and economic trends. We
assessed the historical accuracy of management’s estimates and performed a sensitivity analysis of significant assumptions to evaluate the changes
in the fair value of the reporting units that result from changes in assumptions. We also involved our valuation specialists to assist in the evaluation
of the weighted-average cost of capital utilized in determining the fair value estimates. We tested the allocation of goodwill to the reporting units.
We also evaluated the related disclosures.

/s/ Ernst & Young LLP

We have served as the Company's auditor since 2016.
San Diego, California
February 28, 2023

49

LIGAND PHARMACEUTICALS INCORPORATED

CONSOLIDATED BALANCE SHEETS
(in thousands, except par value)

ASSETS

December 31,

2022

2021

Current assets:

Cash and cash equivalents
Short-term investments
Accounts receivable, net
Inventory
Income taxes receivable
Other current assets
Current assets of discontinued operations

Total current assets
Deferred income taxes, net
Intangible assets, net
Goodwill
Commercial license and other economic rights
Property and equipment, net
Operating lease assets
Finance lease assets
Other assets
Non-current assets of discontinued operations

Total assets

LIABILITIES AND STOCKHOLDERS’ EQUITY

Current liabilities:

Accounts payable
Accrued liabilities
Current contingent liabilities

      Deferred revenue

Current operating lease liabilities
Current finance lease liabilities
2023 convertible senior notes, net
Current liabilities of discontinued operations

Total current liabilities

2023 convertible senior notes, net
Long-term contingent liabilities
Deferred income taxes, net
Long-term operating lease liabilities
Other long-term liabilities
Non-current liabilities of discontinued operations

Total liabilities

Commitments and contingencies
Stockholders’ equity:
      Preferred stock, $0.001 par value; 5,000 shares authorized; zero issued and outstanding at December 31, 2022 and 2021

Common stock, $ 0.001 par value; 60,000 shares authorized; 16,951 and 16,767 shares issued and outstanding at December 31, 2022 and 2021,

respectively

Additional paid-in capital
Accumulated other comprehensive loss
Retained earnings

Total stockholders’ equity

      Total liabilities and stockholders’ equity

See accompanying notes to these consolidated financial statements.

LIGAND PHARMACEUTICALS INCORPORATED

50

$

$

$

$

45,006 
166,864 
30,424 
13,294 
4,614 
3,399 
— 
263,601 
8,530 
342,455 
105,673 
10,182 
12,482 
10,914 
4,095 
4,736 
— 
762,668 

5,307 
15,681 
57 
355 
670 
45 
76,695 
— 
98,810 
— 
3,456 
30,615 
10,336 
21,966 
— 
165,183 

— 

17 
147,590 
(984)
450,862 
597,485 
762,668 

$

$

$

$

19,522 
321,586 
85,453 
27,326 
6,193 
3,571 
1,100 
464,751 
35,729 
376,691 
105,673 
10,110 
13,191 
3,210 
16,201 
1,251 
270,783 
1,297,590 

8,403 
17,579 
50 
654 
1,368 
45 
— 
13,566 
41,665 
320,717 
3,657 
30,856 
2,256 
21,752 
55,528 
476,431 

— 

17 
372,969 
(917)
449,090 
821,159 
1,297,590 

 
Revenues:

Royalties
Captisol
Contract revenue

Total revenues

Operating costs and expenses:

Cost of Captisol
Amortization of intangibles
Research and development
General and administrative
Other operating (income) expense

Total operating costs and expenses

Gain from sale of Vernalis R&D
Income from continuing operations
Other income (expense):

Gain (loss) from short-term investments
Interest income
Interest expense
Other income (expense), net

Total other expense, net
Income before income tax from continuing operations
Income tax benefit (expense)
Net income (loss) from continuing operations
Net loss from discontinued operations
Net income (loss):

Basic net income (loss) from continuing operations per share

Basic net loss from discontinued operations per share
Basic net income (loss) per share

Shares used in basic per share calculation

Diluted net income (loss) from continuing operations per share
Diluted net loss from discontinued operations per share
Diluted net income (loss) per share

Shares used in diluted per share calculation

CONSOLIDATED STATEMENTS OF OPERATIONS
(in thousands, except per share amounts)

2022

Year Ended December 31,
2021

2020

$

$

$
$
$

$
$
$

$

$

$
$
$

$
$
$

72,527 
104,495 
19,223 
196,245 

52,827 
34,237 
36,082 
70,062 
— 
193,208 
— 
3,037 

28,540 
2,046 
(1,799)
4,187 
32,974 
36,011 
(41,230)
(5,219)
(28,142)
(33,361)

(0.31)
(1.67)
(1.98)

16,868 

(0.31)
(1.67)
(1.98)

16,868 

$

$

$
$
$

$
$
$

48,927 
164,250 
28,367 
241,544 

62,176 
34,222 
32,105 
46,790 
(37,600)
137,693 
— 
103,851 

(5,263)
886 
(19,619)
(7,650)
(31,646)
72,205 
4,148 
76,353 
(19,215)
57,138 

4.59 
(1.16)
3.44 

16,630 

4.43 
(1.11)
3.31 

17,246 

33,796 
109,959 
19,807 
163,562 

30,419 
11,642 
40,503 
60,012 
600 
143,176 
17,114 
37,500 

(16,933)
8,078 
(27,415)
62 
(36,208)
1,292 
5,306 
6,598 
(9,583)
(2,985)

0.41 
(0.59)
(0.18)

16,185 

0.39 
(0.57)
(0.18)

16,825 

See accompanying notes to these consolidated financial statements.

51

 
LIGAND PHARMACEUTICALS INCORPORATED
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
(in thousands)

Net income (loss)

Unrealized net gain (loss) on available-for-sale securities, net of tax
Foreign currency translation adjustment

Comprehensive income (loss)

Year Ended December 31,

2022

2021

2020

$

$

(33,361)
(67)
— 
(33,428)

$

$

57,138 
(116)
— 
57,022 

$

$

(2,985)
(162)
(423)
(3,570)

See accompanying notes to these consolidated financial statements.

52

LIGAND PHARMACEUTICALS INCORPORATED

CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY
(in thousands)

Common Stock

Shares

Amount

Additional
paid-in
capital

Accumulated
other
comprehensive
income (loss)

Retain earnings

Total
stockholders’
equity

Balance at December 31, 2019

Issuance of common stock under employee stock compensation plans, net
Share-based compensation
Repurchase of common stock
Unrealized net loss on available-for-sale securities, net of deferred tax
Foreign currency translation adjustment
Reacquisition of equity due to 2023 debt extinguishment, net of tax
Cumulative-effect adjustment from adoption of ASU 2016-13, net of tax
Other tax adjustments
Net loss
Balance at December 31, 2020

Issuance of common stock under employee stock compensation plans, net
Share-based compensation
Unrealized net loss on available-for-sale securities, net of deferred tax
Reacquisition of equity due to 2023 debt extinguishment, net of tax
Warrant and bond hedge unwind transactions
Net income

Balance at December 31, 2021
ASU 2020-06 adoption, net of tax (Note 1)
Issuance of common stock under employee stock compensation plans, net

Share-based compensation
Unrealized net loss on available-for-sale securities, net of deferred tax
Bond hedge transaction

Distribution of OmniAb
Net loss
Balance at December 31, 2022

16,824 
190 
— 
(934)
— 
— 
— 
— 
— 
— 

16,080 
687 
— 
— 
— 
— 
— 

16,767 
— 

184 
— 
— 

— 
— 
— 
16,951 

$

$

17 
— 
— 
(1)
— 
— 
— 
— 
— 
— 

16 
1 
— 
— 
— 
— 
— 

17 
— 

— 
— 
— 

— 
— 
— 
17 

$

$

$

367,326 
1,535 
30,727 
(77,997)
— 
— 
(3,236)
— 
3 
— 

318,358 
27,744 
38,783 
— 
(12,407)
491 
— 

372,969 
(51,130)

(5,004)
60,285 
— 

202 
(229,732)
— 
147,590 

$

(216)
— 
— 
— 
(162)
(423)
— 
— 
— 
— 

(801)
— 
— 
(116)
— 
— 
— 

(917)
— 

— 
— 
(67)

— 
— 
— 
(984)

$

$

400,105 
— 
— 
— 
— 
— 
— 
(5,168)
— 
(2,985)
391,952 
— 
— 
— 
— 
— 
57,138 
449,090 
35,133 
— 
— 
— 
— 
— 
(33,361)
450,862 

$

$

767,232 
1,535 
30,727 
(77,998)
(162)
(423)
(3,236)
(5,168)
3 
(2,985)

709,525 
27,745 
38,783 
(116)
(12,407)
491 
57,138 

821,159 
(15,997)

(5,004)
60,285 
(67)

202 
(229,732)
(33,361)
597,485 

See accompanying notes to these consolidated financial statements.

53

LIGAND PHARMACEUTICALS INCORPORATED

CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)

2022

Year Ended December 31,
2021

2020

Operating activities
Net income (loss)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:

$

(33,361)

$

57,138 

$

Gain from sale of Vernalis R&D
Change in estimated fair value of contingent liabilities
Depreciation of fixed assets and amortization of intangible assets
Loss (gain) short-term investments
Amortization/accretion of premium (discount) on investments, net
Amortization of debt discount and issuance fees
Loss (gain) on debt extinguishment
Amortization of commercial license and other economic rights
Lease amortization expense
Share-based compensation
Deferred income taxes, net
Other
Changes in operating assets and liabilities, net of acquisitions:

Accounts receivable, net
Inventory
Accounts payable and accrued liabilities
Income taxes receivable
Deferred revenue
Other assets and liabilities

Net cash provided by operating activities

Investing activities
Cash paid for acquisition, net of cash and restricted cash acquired
Purchases of property and equipment
Purchases of short-term investments
Proceeds from commercial license rights
Proceeds from sale of short-term investments
Proceeds from maturity of short-term investments
Cash paid for equity method investment
Proceeds on sale of Vernalis R&D, net
Other, net

Net cash provided by investing activities

Financing activities
Net cash transferred to OmniAb at separation
Repayment of debt
Payments under finance lease obligations
Cash paid for OmniAb transaction costs
Proceeds from bond hedge settlement
Net proceeds from stock option exercises and ESPP
Taxes paid related to net share settlement of equity awards
Share repurchases
Repurchase of warrants
Payments to CVR Holders

Net cash used in financing activities

Net increase (decrease) in cash, cash equivalents, and restricted cash

54

— 
(748)
51,534 
(28,540)
16 
734 
(4,192)
(164)
5,521 
60,285 
20,723 
365 

55,319 
12,058 
(3,340)
1,579 
(6,281)
6,342 
137,850 

— 
(17,923)
(51,226)
92 
209,561 
24,830 
(750)
— 
(960)
163,624 

(1,840)
(260,949)
(54)
(6,800)
202 
3,232 
(8,236)
— 
— 
(1,545)
(275,990)
25,484 

— 
(36,962)
51,071 
3,997 
111 
16,692 
7,303 
(125)
4,840 
38,783 
(8,618)
1,572 

(28,616)
(427)
2,810 
(3,976)
(17,870)
(8,925)
78,798 

— 
(8,761)
(181,325)
494 
154,230 
67,105 
— 
— 
(1,220)
30,523 

— 
(155,760)
(9,188)
— 
18,938 
33,763 
(6,018)
— 
(18,446)
(1,050)
(137,761)
(28,440)

(2,985)

(17,114)
963 
25,691 
16,933 
1,479 
23,077 
2,466 
2,275 
1,609 
30,727 
(19,053)
191 

(26,061)
(17,799)
(1,245)
9,144 
29,236 
(4,948)
54,586 

(404,884)
(4,458)
(422,523)
1,358 
394,539 
644,155 
(500)
22,061 
1,900 
231,648 

— 
(222,209)
(9,549)
— 
— 
3,017 
(1,481)
(77,998)
— 
(2,325)
(310,545)
(24,311)

Cash, cash equivalents and restricted cash at beginning of year
Cash, cash equivalents and restricted cash at end of year

Supplemental disclosure of cash flow information
Cash paid during the year:
Interest paid
Taxes paid
Restricted cash in other current assets
Supplemental schedule of non-cash investing and financing activities:
Accrued inventory purchases
Unrealized loss on available-for-sale investments
Purchase of fixed assets recorded in accounts payable

$

$
$
$

$
$
$

19,522 
45,006 

1,428 
11,642 
— 

— 
(85)
2,333 

$

$
$
$

$
$
$

47,962 
19,522 

3,028 
3,722 
— 

1,974 
(221)
1,567 

$

$
$
$

$
$
$

72,273 
47,962 

4,463 
2,130 
343 

1,562 
(212)
249 

See accompanying notes to these consolidated financial statements.

55

Unless the context requires otherwise, references in this report to “Ligand,” “we,” “us,” the “Company,” and “our” refer to Ligand Pharmaceuticals Incorporated and its
consolidated subsidiaries.

1. Basis of Presentation and Summary of Significant Accounting Policies

Business

On November 1, 2022, we completed the separation (the “Separation”) of our antibody discovery business and certain related assets and liabilities (the “OmniAb Business”) through
a spin-off of OmniAb to Ligand’s shareholders of record as of October 26, 2022 on a pro rata basis (the “Distribution”) and merger (the “Merger”) of OmniAb with a wholly owned
subsidiary of a separate public company, OmniAb, Inc. (formerly known as Avista Public Acquisition Corp. II (“New OmniAb”)), in a Reverse Morris Trust transaction pursuant to
the Agreement and Plan of Merger, dated as of March 23, 2022 (the “Merger Agreement”), and the Separation and Distribution Agreement, dated as of March 23, 2022 (the
“Separation Agreement”) (the Merger Agreement and Separation Agreement, collectively with the other related transaction documents, the “Transaction Agreements”). Pursuant to
the Transaction Agreements, Ligand contributed to OmniAb cash and certain assets and liabilities constituting the OmniAb Business, including but not limited to the equity interests
of Ab Initio Biotherapeutics, Inc., Crystal Bioscience, Inc., Icagen, LLC, Taurus Biosciences, LLC and xCella Biosciences, Inc.

After the spin-off of our OmniAb antibody discovery business, Ligand is a revenue-generating biopharmaceutical company focused on developing or acquiring technologies that help
pharmaceutical companies discover and develop medicines. We operate in one business segment: development and licensing of biopharmaceutical assets.

Basis of Presentation and Principles of Consolidation

Our consolidated financial statements have been prepared in accordance with U.S. GAAP and include the accounts of our parent company and its wholly-owned subsidiaries. All
intercompany transactions and balances have been eliminated in consolidation.

Discontinued operations

The Company determined that the spin-off of the OmniAb Business in November 2022 met the criteria for classification as a discontinued operation in accordance with ASC Subtopic
205-20, Discontinued Operations (“ASC 205-20”). Accordingly, the accompanying consolidated financial statements for all periods presented have been updated to present the assets
and liabilities associated with the OmniAb Business separately as discontinued operations on the consolidated balance sheets and the results of all discontinued operations reported as
a separate component of loss in the consolidated statements of operations and comprehensive loss (see Note 2, Spin-off of OmniAb). All disclosures have been adjusted to reflect
continuing operations.

Use of Estimates

The preparation of consolidated financial statements in conformity with U.S. GAAP requires the use of estimates and assumptions that affect the amounts reported in the consolidated
financial statements and the accompanying notes. Actual results may differ from those estimates.

Concentrations of Business Risk

Financial instruments that potentially subject us to significant concentrations of credit risk consist primarily of cash equivalents and investments. We invest excess cash principally in
United States government debt securities, investment grade corporate debt securities, mutual funds and certificates of deposit. We maintain some cash and cash equivalents balances
with financial institutions that are in excess of the Federal Deposit Insurance Corporation insurance limits. We have established guidelines relative to diversification and maturities
that maintain safety and liquidity. These guidelines are periodically reviewed and modified to take advantage of trends in yields and interest rates.

56

Revenue from significant partners, which is defined as 10% or more of our total revenue, was as follows:

Partner A
Partner B
Partner C

2022
45%
16%
<10%

(a)

Year ended December 31,
2021
47%
12%
<10%

(a)

2020
51%
17%
<10%

(a) Prior period amounts have been retrospectively adjusted to reflect the effects of the Separation.

We obtain Captisol primarily from two sites related to a single supplier, Hovione. If this supplier were not able to supply the requested amounts of Captisol from each site, and if our
safety stocks of material were depleted, we would be unable to continue to derive revenues from the sale of Captisol until we obtained material from an alternative source, which
could take a considerable length of time.

Cash Equivalents

Cash equivalents consist of highly liquid investments with maturities of three months or less from the date of acquisition.

Short-term Investments

Short-term investments primarily consist of investments in debt and equity securities. We classify our short-term investments as “available-for-sale”. Such investments are carried at
fair value, with unrealized gains and losses on debt securities included in the statement of comprehensive income (loss), net of tax, and unrealized gains and losses on equity securities
included the consolidated statement of operations. We determine the cost of investments based on the specific identification method. We determine the realized gains or losses on the
sale of available-for-sale securities using the specific identification method and includes net realized gains and losses as a component of other income or expense within the
consolidated statements of operations.

Debt securities consist of certificates of deposit, corporate debt securities, and securities of government-sponsored entities have effective maturities greater than three months and less
than twenty-five months from the date of acquisition. Debt securities available-for-sale in an unrealized loss position are assessed for the current expected credit losses methodology.
We start by assessing whether we intend to sell the security, or whether it is more likely than not that we will be required to sell the security before recovery of its amortized cost
basis. If either of the criteria regarding intent or requirement to sell is met, the security’s amortized cost basis is written down to fair value through earnings. For debt securities
available-for-sale that do not meet the aforementioned criteria, we evaluate whether the decline in fair value has resulted from credit losses or other factors. In making this assessment,
we consider the extent to which fair value is less than amortized cost, any changes in interest rates, and any changes to the rating of the security by a rating agency, among other
factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security is compared to the amortized cost basis of the
security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses is recorded, limited by
the amount that the fair value is less than the amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses is recognized in other
comprehensive income or loss, as applicable.

Equity securities are mutual funds, investments in privately held companies (non-marketable equity securities), and companies that have completed initial public offerings (marketable
equity securities). Mutual funds are valued at their publicly quoted net asset value (NAV) price on the last day of the period. Our non-marketable equity securities without readily
determinable market values are initially measured at cost and adjusted to fair value for observable transactions for identical or similar investments of the same issuer or impairment.
Our marketable equity securities are measured at fair value. Equity investments are classified as short-term investments, or non-current other assets, based on the nature of the
securities and their availability for use in current operations.

Accounts Receivable

Our accounts receivable arise primarily from sales on credit to customers. We establish an allowance for credit losses to present the net amount of accounts receivable expected to be
collected. The allowance is determined by using the loss-rate method, which requires an estimation of loss rates based upon historical loss experience adjusted for factors that are
relevant to determining the expected collectability of accounts receivable. Some of these factors include macroeconomic conditions that correlate with historical loss experience,
delinquency trends, aging behavior of receivables and credit and liquidity quality indicators for industry groups, customer classes or individual customers.

Inventory

57

Inventory, which consists of finished goods, is stated at the lower of cost or net realizable value. We determine cost using the specific identification method. We analyze our inventory
levels periodically and write down inventory to net realizable value if it has become obsolete, has a cost basis in excess of its expected net realizable value or is in excess of expected
requirements. During the year ended December 31, 2022, we recorded an obsolete inventory charge of $1.1 million. There were no adjustments to inventory recorded for the years
ended December 31, 2021 and 2020. As of December 31, 2022 and 2021, inventory included prepayments of $5.9 million and $24.6 million, respectively, to our supplier for Captisol.

Property and Equipment

Property and equipment are stated at cost, subject to review for impairment, and depreciated over the estimated useful lives of the assets, which generally range from three to ten
years, using the straight-line method. Amortization of leasehold improvements is recorded over the shorter of the lease term or estimated useful life of the related asset. Maintenance
and repairs are charged to operations as incurred. When assets are sold, or otherwise disposed of, the cost and related accumulated depreciation are removed from the accounts and
any gain or loss is included in operating income or expense.

Acquisitions

We first determine whether a set of assets acquired constitute a business and should be accounted for as a business combination. If the assets acquired are not a business, we account
for the transaction as an asset acquisition. Business combinations are accounted for by using the acquisition method of accounting which requires us to use significant estimates and
assumptions, especially with respect to intangible assets. We record the excess consideration over the aggregate fair value of tangible and intangible assets, net of liabilities assumed,
as goodwill.

Under the acquisition method of accounting, we recognize separately from goodwill the identifiable assets acquired, the liabilities assumed, including contingent consideration and all
contractual contingencies, generally at the acquisition date fair value. Contingent purchase consideration to be settled in cash are remeasured to estimated fair value at each reporting
period with the change in fair value recorded in statement of operations. Costs that we incur to complete the business combination such as investment banking, legal and other
professional fees are not considered part of consideration and we charge them to general and administrative expense as they are incurred.

Should the initial accounting for a business combination be incomplete by the end of a reporting period that falls within the measurement period, we report provisional amounts in our
financial statements. During the measurement period, we adjust the provisional amounts recognized at the acquisition date to reflect new information obtained about facts and
circumstances that existed as of the acquisition date that, if known, would have affected the measurement of the amounts recognized as of that date and we record those adjustments to
our financial statements in the period of change, if any.

Under the acquisition method of accounting for business combinations, if we identify changes to acquired deferred tax asset valuation allowances or liabilities related to uncertain tax
positions during the measurement period and they relate to new information obtained about facts and circumstances that existed as of the acquisition date, those changes are
considered a measurement period adjustment and we record the offset to goodwill. We record all other changes to deferred tax asset valuation allowances and liabilities related to
uncertain tax positions in current period income tax expense.

Contingent Liabilities

In connection with the acquisition of Pfenex in October 2020, we entered into a CVR agreement pursuant to which former equity holders of Pfenex received one nontransferable
contractual right entitling such holder to receive $2.00 per share (or approximately $77.8 million total) in the event that Pfenex’s teriparatide injection product received notice from
the FDA that such product is therapeutically equivalent with respect to FORTEO® (teriparatide injection) on or before December 31, 2021. The FDA did not provide notice of such
event prior to the CVR expiration date and as a result, the Pfenex CVRs expired without payment.

In connection with the acquisition of CyDex in January 2011, we recorded a contingent liability for amounts potentially due to holders of the CyDex CVRs and former license
holders. The liability is periodically assessed based on events and circumstances related to the underlying milestones, royalties and material sales.

In connection with the acquisition of Metabasis in January 2010, we issued Metabasis stockholders four tradable CVRs for each Metabasis share. The fair values of the CVRs are
remeasured at each reporting date through the term of the related agreement.

Any change in fair value is recorded in our consolidated statement of operations. For additional information, see “Note (5), Fair Value Measurement and Note (8), Balance Sheet
Account Details.”

Goodwill, Intangible Assets and Other Long-Lived Assets

Goodwill, which has an indefinite useful life, represents the excess of cost over fair value of net assets acquired. Goodwill is reviewed for impairment at least annually during the
fourth quarter, or more frequently if an event occurs indicating the potential for impairment. During the goodwill impairment review, we assess qualitative factors to determine
whether it is more

58

likely than not that the fair value of our reporting unit is less than the carrying amount, including goodwill. The qualitative factors include, but are not limited to, macroeconomic
conditions, industry and market considerations, and the overall financial performance. If, after assessing the totality of these qualitative factors, we determine that it is not more likely
than not that the fair value of our reporting unit is less than the carrying amount, then no additional assessment is deemed necessary. Otherwise, we proceed to perform the
quantitative assessment. We will then evaluate goodwill for impairment by comparing the estimated fair value of the reporting unit to its carrying value, including the associated
goodwill. To determine the fair value, we generally use a combination of market approach based on Ligand and comparable publicly traded companies in similar lines of businesses
and the income approach based on estimated discounted future cash flows. Our cash flow assumptions consider historical and forecasted revenue, operating costs and other relevant
factors. We may also elect to bypass the qualitative assessment in a period and elect to proceed to perform the quantitative assessment for the goodwill impairment test. We performed
the annual assessment for goodwill impairment during the fourth quarter of 2022, noting no impairment.

Our identifiable intangible assets are typically composed of acquired core technologies, licensed technologies, contractual relationships, customer relationships and trade names. The
cost of identifiable intangible assets with finite lives is generally amortized on a straight-line basis over the assets’ respective estimated useful lives. We regularly perform reviews to
determine if any event has occurred that may indicate that intangible assets with finite useful lives and other long-lived assets are potentially impaired. If indicators of impairment
exist, an impairment test is performed to assess the recoverability of the affected assets by determining whether the carrying amount of such assets exceeds the undiscounted expected
future cash flows. If the affected assets are not recoverable, we estimate the fair value of the assets and record an impairment loss if the carrying value of the assets exceeds the fair
value. Factors that may indicate potential impairment include market conditions, industry and economic trends, changes in regulations, clinical success, historical and forecasted
financial results, market capitalization, significant changes in the ability of a particular asset to generate positive cash flows, and the pattern of utilization of a particular asset. We did
not identify indicators of impairment for the finite-lived intangibles at December 31, 2022.

Commercial license and other economic rights

As of December 31, 2022 and 2021, commercial license and other economic rights consist of the following (in thousands):

Aziyo and CorMatrix
Selexis and Dianomi
     Total

Gross

December 31, 2022
Adjustments

(1)

Net

Gross

December 31, 2021
Adjustments

(2)

$

$

17,696 
10,602 
28,298 

$

$

(9,538)
(8,578)
(18,116)

$

$

8,158 
2,024 
10,182 

$

$

17,696 
10,602 
28,298 

$

$

(9,461)
(8,727)
(18,188)

$

$

Net

8,235 
1,875 
10,110 

(1) Amounts represent accumulated amortization to principal of $ 11.6 million and credit loss adjustments of $ 6.5 million as of December 31, 2022.
(2) Amounts represent accumulated amortization to principal of $ 11.7 million and credit loss adjustments of $ 6.5 million as of December 31, 2021.

Commercial license and other economic rights as of December 31, 2022 represent a portfolio of future milestone and royalty payment rights acquired from Selexis in April 2013 and
April 2015, CorMatrix in May 2016, and Dianomi in January 2019. Commercial license rights acquired are accounted for as financial assets, and other economic rights are accounted
for as funded research and developments as further discussed below.

In May 2019, we entered into a development funding and royalties agreement with Novan, pursuant to which we would receive certain payments at specified milestones, as well as
royalties on any future net sales of SB206, a product candidate being developed to treat molluscum contagiosum, and any other Novan products used for the treatment of molluscum
(“Novan Molluscum Products”). We paid Novan an upfront payment of $12.0 million, which Novan is required to use to fund the development of SB206. We are not obligated to
provide additional funding to Novan for the development or commercialization of SB206. Pursuant to the agreement, we would receive up to $20.0 million of milestone payments
upon the achievement by Novan of certain regulatory milestones for SB206 or any other Novan Molluscum Product and commercial milestones. In addition to the milestone
payments, Novan will pay us tiered royalties from 7.0% to 10.0% based on aggregate annual net sales of SB206 or any other Novan Molluscum Product in North America.

In December 2018, we entered into a development funding and royalties agreement with Palvella. Pursuant to the agreement, we will receive up to $8.0 million of milestone payments
upon the achievement by Palvella of certain corporate, financing and regulatory milestones for PTX-022, a product candidate being developed to treat pachyonychia congenita. In
addition to the milestone payments, Palvella will pay us tiered royalties from 5.0% to 9.8% based on aggregate annual worldwide net sales of any PTX-022 products, if approved,
subject to Palvella’s right to reduce the royalty rates by making payments in certain circumstances. We made an upfront payment of $10.0 million, which Palvella is required to use to
fund the development of PTX-022. We are not obligated to provide additional funding to Palvella for development or commercialization of PTX-022.

59

We determined the economic rights related to Novan and Palvella should be characterized as a funded research and development arrangement, thus we account for them in accordance
with ASC 730-20, Research and Development Arrangement, and reduce our asset as the funds are expended by Novan and Palvella. As of December 31, 2019, Novan had used up the
$12.0 million upfront payment provided by us. As such, our other economic rights related to Novan had been fully amortized as of December 31, 2019. As of December 31, 2020,
the fund has been fully expended by Palvella and our cost basis for the asset has been reduced to zero, and therefore we will recognize milestones and royalties as revenue when
earned. During 2020, we recorded a $3.0 million milestone from Palvella under contract revenue, which has been included in our consolidated statement of operations for the year
ended December 31, 2020.

In May 2017, we entered into a royalty agreement with Aziyo pursuant to which we will receive royalties from certain marketed products that Aziyo acquired from CorMatrix.
Pursuant to the agreement, we received $10.0 million in 2017 from Aziyo to buydown the royalty rates on the products CorMatrix sold to Aziyo. The agreement closed on May 31,
2017, in connection with the closing of the asset sale from CorMatrix to Aziyo (the “CorMatrix Asset Sale”). Per the agreement, we will receive a 5% royalty on the products Aziyo
acquired in the CorMatrix Asset Sale, reduced from the original 20% royalty from CorMatrix pursuant to the previously disclosed interest purchase agreement, dated May 3, 2016 (the
“Original Interest Purchase Agreement”) between CorMatrix and us. In addition, Aziyo has agreed to pay us up to $10.0 million of additional milestones tied to cumulative net sales
of the products Aziyo acquired in the CorMatrix Asset Sale and to extend the term on these royalties by one year. The royalty agreement will terminate on May 31, 2027. In addition,
in May 2017, we entered into an amended and restated interest purchase agreement (the “Amended Interest Purchase Agreement”) with CorMatrix, which supersedes in its entirety the
Original Interest Purchase Agreement. Other than removing the commercial products sold to Aziyo in the CorMatrix Sale, the terms of the Amended Interest Purchase Agreement
remain unchanged with respect to the CorMatrix developmental pipeline products, including the royalty rate of 5% on such pipeline products. The Amended Interest Purchase
Agreement will terminate 10 years from the date of the first commercial sale of such products.

We account for the Aziyo commercial license right as a financial asset in accordance with ASC 310, Receivables, and amortize the commercial license right using the effective
interest method whereby we forecast expected cash flows over the term of the arrangement to arrive at an annualized effective interest. The annual effective interest associated with
the forecasted cash flows from the royalty agreement with Aziyo as of December 31, 2022 is 19.0%. Revenue is calculated by multiplying the carrying value of the commercial
license right by the effective interest. The payments received in the year ended December 31, 2022 and 2021 were allocated accordingly between revenue and the amortization of the
commercial license rights.

Prior to 2020, we accounted for commercial license rights related to developmental pipeline products such as Selexis and Dianomi on a non-accrual basis. These developmental
pipeline products are non-commercialized, non-approved products that require FDA or other regulatory approval, and thus have uncertain cash flows. The developmental pipeline
products are on a non-accrual basis as we are not yet able to forecast future cash flows given their pre-commercial stages of development. We will prospectively update the yield
model under the effective interest method once the underlying products are commercialized and we can reliably forecast expected cash flows. Income will be calculated by multiplying
the carrying value of the commercial license right by the effective interest rate. We regularly perform reviews to determine if any event has occurred that may indicate the carrying
value of these commercial license rights are potentially impaired. If the affected commercial license rights are not recoverable, we estimate the fair value of the assets and record an
impairment loss if the carrying value of the assets exceeds the fair value. During 2020, given the expected cash flow from the Selexis program, we started to account for the Selexis
commercial license right as a financial asset in accordance with ASC 310, and amortize the commercial license right using the effective interest method whereby we forecast expected
cash flows over the term of the arrangement to arrive at an annualized effective interest. The annual effective interest associated with the forecasted cash flows from the royalty
agreement with Selexis as of December 31, 2022 is 24.6%. Revenue is calculated by multiplying the carrying value of the commercial license right by the effective interest. The
payments received in the year ended December 31, 2022 and 2021 were allocated accordingly between revenue and the amortization of the commercial license rights. We still
accounted for commercial license rights related to Dianomi on a non-accrual basis as of December 31, 2022.

For commercial license rights, we have elected a prospective approach to account for changes in estimated cash flows and selected a method for determining when an impairment
would be recognized and how to measure that impairment. In circumstances where our new estimate of expected cash flows is greater than previously expected, we will update our
yield prospectively. In circumstances where our new estimate of expected cash flows is less than previously expected and below our original estimated yield we record an impairment.
Impairment is recognized by reducing the financial asset to an amount that represents the present value of our most recent estimate of expected cash flows discounted by the original
effective interest rate. In circumstances where our new estimate of expected cash flows is less than previously expected, but not below our original estimated yield, we update our
yield prospectively.

As a result of adopting ASU 2016-13, Financial Instruments – Credit Losses: Measurement of Credit losses on Financial Instruments (Topic 326), we now recognize an allowance for
current expected credit losses on the commercial license rights subject to credit risk. We recorded a $5.5 million pre-tax reserve for credit losses upon adoption of the standard on
January 1,

60

2020. We estimated the credit losses at the individual asset level by considering the performance against the programs, the company operating performance and the macroeconomic
forecast. In addition, we have judgmentally applied credit loss risk factors to the future expected payments with consideration given to the timing of the payment. Given the higher
inherent credit risk associated with longer term receivables, we applied a lower risk factor to the earlier years and progressively higher risk factors to the later years. During the twelve
months ended December 31, 2022 and 2021, we further considered the current and expected future economic and market conditions. We concluded a reduction of $0.3 million and
$0.5 million to the allowance for credit losses in other expense, net, in our consolidated statements of operations for the year ended 2022 and 2021, respectively.

Revenue Recognition

Our revenue is generated primarily from royalties on sales of products commercialized by our partners, Captisol material sales, and contract revenue for services, license fees and
development, regulatory and sales based milestone payments.

We apply the following five-step model in accordance with ASC 606, Revenue from Contracts with Customers, in order to determine the revenue: (i) identification of the promised
goods or services in the contract; (ii) determination of whether the promised goods or services are performance obligations, including whether they are distinct in the context of the
contract; (iii) measurement of the transaction price, including the constraint on variable consideration; (iv) allocation of the transaction price to the performance obligations; and (v)
recognition of revenue when (or as) the Company satisfies each performance obligation.

Royalties

We receive royalty revenue on sales by our partners of products covered by patents that we or our partners own under contractual agreements. We do not have future performance
obligations under these license arrangements. We generally satisfy our obligation to grant intellectual property rights on the effective date of the contract. However, we apply the
royalty recognition constraint required under the guidance for sales-based royalties which requires a royalty to be recorded no sooner than the underlying sale occurs. Therefore,
royalties on sales of products commercialized by our partners are recognized in the quarter the product is sold. Our partners generally report sales information to us on a one quarter
lag. Thus, we estimate the expected royalty proceeds based on an analysis of historical experience and interim data provided by our partners including their publicly announced sales.
Differences between actual and estimated royalty revenues are adjusted in the period in which they become known, typically the following quarter.

Captisol Sales

Revenue from Captisol sales is recognized when control of Captisol material or intellectual property license rights is transferred to our customers in an amount that reflects the
consideration we expect to receive from our customers in exchange for those products. A performance obligation is considered distinct from other obligations in a contract when it
provides a benefit to the customer either on its own or together with other resources that are readily available to the customer and is separately identified in the contract. For Captisol
material, we consider our performance obligation is satisfied at a point in time, once we have transferred control of the product, meaning the customer has the ability to use and obtain
the benefit of the Captisol material or intellectual property license right. We recognize revenue for satisfied performance obligations only when we determine there are no uncertainties
regarding payment terms or transfer of control. Sales tax and other taxes we collect concurrent with revenue-producing activities are excluded from revenue. We have elected to
recognize the cost of freight and shipping when control over Captisol material has transferred to the customer as an expense in Cost of Captisol. We expense incremental costs of
obtaining a contract when incurred if the expected amortization period of the asset that we would have recognized is one year or less or the amount is immaterial. We did not incur any
incremental costs of obtaining a contract during the periods reported.

Contract Revenue

Our contracts with customers often will include variable consideration in the form of contingent milestone-based payments. We include contingent milestone based payments in the
estimated transaction price when it is probable a significant reversal in the amount of cumulative revenue recognized will not occur. These estimates are based on historical
experience, anticipated results and our best judgment at the time. If the contingent milestone based payment is sales-based, we apply the royalty recognition constraint and record
revenue when the underlying sale has taken place. Significant judgments must be made in determining the transaction price for our sales of intellectual property. Because of the risk
that products in development with our partners will not reach development based milestones or receive regulatory approval, we generally recognize any contingent payments that
would be due to us upon the development milestone or regulatory approval. Depending on the terms of the arrangement, we may also defer a portion of the consideration received if
we have to satisfy a future obligation, which typically occurs with our contracts for R&D services.

For R&D services we recognize revenue over time and we measure our progress using an input method. The input methods we use are based on the effort we expend or costs we incur
toward the satisfaction of our performance obligation. We estimate the amount of effort we expend, including the time it will take us to complete the activities, or the costs we may
incur in a given

61

period, relative to the estimated total effort or costs to satisfy the performance obligation. This results in a percentage that we multiply by the transaction price to determine the amount
of revenue we recognize each period. This approach requires us to make numerous estimates and use significant judgement. If our estimates or judgements change over the course of
the collaboration, they may affect the timing and amount of revenue that we recognize in the current and future periods.

We occasionally have sub-license obligations related to arrangements for which we receive license fees, milestones and royalties. We evaluate the determination of gross as a principal
versus net as an agent reporting based on each individual agreement.

Deferred Revenue

Depending on the terms of the arrangement, we may also defer a portion of the consideration received if we have to satisfy a future obligation.

The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets), and customer advances and deposits
(contract liabilities) on the consolidated balance sheet. Except for royalty revenue, we generally receive payment at the point we satisfy our obligation or soon after. Therefore, we do
not generally carry a contract asset balance. Any fees billed in advance of being earned are recorded as deferred revenue. During the twelve months ended December 31, 2022, the
amount recognized as revenue that was previously deferred at December 31, 2021 was $0.4 million. During the twelve months ended December 31, 2021, the amount recognized as
revenue that was previously deferred at December 31, 2020 was $23.3 million.

Disaggregation of Revenue

Royalty revenue for 2022, 2021 and 2020 for continuing operations are reported as below (in thousands):

Kyprolis
Evomela
Teriparatide injection
Rylaze
Other

2022

Year ended December 31,
2021

2020

$

$

30,116  $
10,197 
15,785 
8,796 
7,633 
72,527  $

27,472  $
10,079 
5,260 
2,420 
3,696 
48,927  $

25,164 
6,377 
— 
— 
2,255 
33,796 

The following table represents disaggregation of Captisol and contract revenue for continuing operations (in thousands):

Captisol
     Captisol - Core
     Captisol - COVID

(a)

Contract
     Service Revenue
     License Fees
     Milestone
     Other

2022

Year ended December 31,
2021

2020

$

$

$

$

16,429  $
88,066 
104,495  $

1,117  $
2,849 
9,150 
6,107 
19,223  $

23,423  $
140,827 
164,250  $

3,737  $
634 
17,584 
6,412 
28,367  $

24,566 
85,393 
109,959 

9,330 
119 
5,217 
5,141 
19,807 

(a) Captisol - COVID represents revenue on Captisol supplied for use in formulation with remdesivir, an antiviral treatment for COVID-19.

62

Research and Development Expenses

Research and development expense consists of labor, material, equipment, and allocated facilities costs of our scientific staff who are working pursuant to our collaborative
agreements and other research and development projects. Also included in research and development expenses are third-party costs incurred for our research programs including in-
licensing costs, contract research organization (CRO) costs and costs incurred by other research and development service vendors. We expense these costs as they are incurred. When
we make payments for research and development services prior to the services being rendered, we record those amounts as prepaid assets on our consolidated balance sheet and we
expense them as the services are provided.

Share-Based Compensation

We incur share-based compensation expense related to restricted stock, ESPP, and stock options.

Restricted stock unit (RSU) and performance stock unit (PSU) are all considered restricted stock. The fair value of restricted stock is determined by the closing market price of our
common stock on the date of grant. We recognize share-based compensation expense based on the fair value on a straight-line basis over the requisite service periods of the awards,
taking into consideration of forfeitures as they occur. PSU generally represents a right to receive a certain number of shares of common stock based on the achievement of corporate
performance goals and continued employment during the vesting period. At each reporting period, we reassess the probability of the achievement of such corporate performance goals
and any expense change resulting from an adjustment in the estimated shares to be released are treated as a cumulative catch-up in the period of adjustment. A limited amount of
PSUs contain a market condition dependent upon the Company’s relative and absolute total stockholder return over a three-year period, with a range of 0% to 200% of the target
amount granted to be issued under the award. Share-based compensation expense for these PSUs is measured using the Monte-Carlo simulation valuation model and is not adjusted
for the achievement, or lack thereof, of the market conditions.

The Black-Scholes-Merton option-pricing model is used to estimate the fair value of stock purchases under our ESPP and stock options granted. The model assumptions include
expected volatility, term, dividends, and the risk-free interest rate. We look to historical and implied volatility of our stock to determine the expected volatility. The expected term of
an award is based on historical forfeiture experience, exercise activity, and on the terms and conditions of the stock awards. The expected dividend yield is determined to be 0% given
that except for 2007, during which we declared a cash dividend on our common stock of $2.50 per share, we have not paid any dividends on our common stock in the past and
currently do not expect to pay cash dividends or make any other distributions on common stock in the future. The risk-free interest rate is based upon U.S. Treasury securities with
remaining terms similar to the expected term of the share-based awards.

We grant options, RSUs and PSUs to employees and non-employee directors. Non-employee directors are accounted for as employees. Options and RSUs granted to certain non-
employee directors typically vest one year from the date of grant. Options granted to employees typically vest 1/8 on the six month anniversary of the date of grant, and 1/48 each
month thereafter for forty-two months. RSUs and PSUs granted to employees vest over three years. All option awards generally expire ten years from the date of grant.

Share-based compensation expense for awards to employees and non-employee directors is recognized on a straight-line basis over the vesting period until the last tranche vests.

Income Taxes

The provision for income taxes is computed using the asset and liability method, under which deferred tax assets and liabilities are recognized for the expected future tax
consequences of temporary differences between the financial reporting and tax bases of assets and liabilities, and for the expected future tax benefit to be derived from tax loss and
credit carryforwards. Deferred tax assets and liabilities are determined using the enacted tax rates in effect for the years in which those tax assets are expected to be realized. The
effect of a change in tax rates on deferred tax assets and liabilities is recognized in the provision for income taxes in the period that includes the enactment date.

Deferred tax assets are regularly assessed to determine the likelihood they will be recovered from future taxable income. A valuation allowance is established when we believe it is
more likely than not the future realization of all or some of a deferred tax asset will not be achieved. In evaluating the ability to recover deferred tax assets within the jurisdiction
which they arise we consider all available positive and negative evidence. Factors reviewed include the cumulative pre-tax book income for the past three years, scheduled reversals of
deferred tax liabilities, history of earnings and reliable forecasting, projections of pre-tax book income over the foreseeable future, and the impact of any feasible and prudent tax
planning strategies.

We recognize the impact of a tax position in our financial statements only if that position is more likely than not of being sustained upon examination by taxing authorities, based on
the technical merits of the position. Tax authorities regularly examine our returns in the jurisdictions in which we do business and we regularly assess the tax risk of our return filing
positions. Due to the complexity of some of the uncertainties, the ultimate resolution may result in payments that are materially

63

different from our current estimate of the tax liability. These differences, as well as any interest and penalties, will be reflected in the provision for income taxes in the period in which
they are determined.

Income (Loss) Per Share

Basic income (loss) per share is calculated by dividing net income (loss) by the weighted-average number of common shares outstanding during the period. Diluted income per share
is computed based on the sum of the weighted average number of common shares and potentially dilutive common shares outstanding during the period. Diluted loss per share is
computed based on the sum of the weighted average number of common shares outstanding during the period.

Potentially dilutive common shares consist of shares issuable under the 2023 Notes, stock options and restricted stock. The 2023 Notes have a dilutive impact when the average
market price of the Company’s common stock exceeds the applicable conversion price of the respective notes. It is our intent and policy to settle conversions through combination
settlement, which essentially involves payment in cash equal to the principal portion and delivery of shares of common stock for the excess of the conversion value over the principal
portion. Potentially dilutive common shares from stock options and restricted stock are determined using the average share price for each period under the treasury stock method. In
addition, the following amounts are assumed to be used to repurchase shares: proceeds from exercise of stock options and the average amount of unrecognized compensation expense
for stock options and restricted stock. In loss periods, basic net loss per share and diluted net loss per share are identical since the effect of otherwise dilutive potential common shares
is anti-dilutive and therefore excluded.

In accordance with ASC 260, Earnings per Share, if a company had a discontinuing operation, the company uses income from continuing operations, adjusted for preferred
dividends and similar adjustments, as its control number to determine whether potential common shares a dilutive. The following table presents the calculation of weighted average
shares used to calculate basic and diluted income (loss) per share (in thousands):

Weighted average shares outstanding:
Dilutive potential common shares:
   Restricted stock
   Stock options
Shares used to compute diluted income per share
Potentially dilutive shares excluded from calculation due to anti-dilutive effect

Comprehensive Income (Loss)

Year Ended December 31,

2022

2021

2020

16,868 

— 
— 
16,868 
6,241 

16,630 

96 
520 
17,246 
4,793 

16,185 

56 
584 
16,825 
8,458 

Comprehensive income (loss) represents net income (loss) adjusted for the change during the periods presented in unrealized gains and losses on available-for-sale debt securities,
foreign currency translation adjustments, and reclassification adjustments for realized gains or losses included in net income (loss). The unrealized gains or losses are reported on the
Consolidated Statements of Comprehensive Income (Loss).

Foreign Currency Translation

The British Pound Sterling was the functional currency of our subsidiary, Vernalis, which was sold in fourth quarter of the year ended December 31, 2020. For the year ended
December 31, 2020, the corresponding financial statements have been translated into U.S. Dollars in accordance with ASC 830-30, Translation of Financial Statements. Assets and
liabilities are translated at end-of-period rates while revenues and expenses are translated at average rates in effect during the period in which the activity took place. Equity is
translated at historical rates and the resulting cumulative translation adjustments are included as a component of accumulated other comprehensive income (loss).

Accounting Standards Updates, Recently Adopted

64

 
In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity’s Own Equity
(Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (“ASU 2020-06”). The guidance simplifies the complexity associated with
applying U.S. GAAP for certain financial instruments with characteristics of liabilities and equity. More specifically, the amendments focus on the guidance for convertible
instruments and derivative scope exception for contracts in an entity’s own equity. Consequently, a convertible debt instrument, such as the Company’s 2023 Notes, will be accounted
for as a single liability measured at its amortized cost, if no other features require bifurcation and recognition as derivatives. The new guidance also requires the if-converted method to
be applied for all convertible instruments and requires additional disclosures. ASU 2020-06 is effective for fiscal years beginning after December 15, 2021, including interim periods
within those fiscal years.

We adopted this guidance effective January 1, 2022 under the modified retrospective approach and the comparative information has not been restated and continues to be presented
according to accounting standards in effect for those periods. The cumulative effect of the change was recognized as an adjustment to the opening balance of retained earnings at the
date of adoption and our 2023 Notes are no longer bifurcated into separate liability and equity components. The principal amount of the 2023 Notes is classified as a single liability
measured at amortized cost in the consolidated balance sheet for the period ended December 31, 2022. Upon adoption of ASU 2020-06 on January 1, 2022, we recorded an
adjustment to the 2023 Notes liability component, deferred tax liabilities, additional paid-in-capital and retained earnings. This adjustment was calculated based on the carrying
amount of the 2023 Notes as if it had always been treated as a single liability measured at amortized cost. Furthermore, we recorded an adjustment to the debt issuance costs contra
liability and equity (additional paid-in-capital) components under the same premise, as if debt issuance costs had always been treated as a contra liability only. Under this transition
method, the cumulative effect of the accounting change increased the carrying amount of the 2023 Notes by $20.4 million, reduced deferred tax liabilities by $4.4 million, reduced
additional paid-in capital by $51.1 million and increased retained earnings by $35.1 million. The net balance of the 2023 Notes at January 1, 2022 was $341.1 million which included
an unamortized discount of $2.2 million.

Accounting Standards Not Yet Adopted

We do not believe that any other recently issued, but not yet effective accounting pronouncements, if adopted, would have a material impact on our consolidated financial statements
or disclosures.

2. Spin-off of OmniAb

On March 23, 2022, we entered into the Separation Agreement to separate our OmniAb Business and the Merger Agreement, pursuant to which Avista Public Acquisition Corp. II
(“APAC”) would combine with OmniAb, and acquire Ligand's OmniAb Business, in a Reverse Morris Trust transaction (collectively, the “Transactions”). In connection with the
execution of the Merger Agreement, we made organizational changes to better align our organizational structure with our strategy and operations, and management reorganized the
reportable segments to better reflect how the business is evaluated by the chief operating decision maker. Beginning in the first quarter of 2022, we operated the following two
reportable segments: (1) OmniAb business and (2) Ligand core business. The OmniAb business segment is focused on enabling the discovery of therapeutic candidates for our
partners by pairing antibody repertoires generated from our proprietary transgenic animals with our OmniAb business platform screening tools. The Ligand core business segment is
a biopharmaceutical business focused on developing or acquiring technologies that help pharmaceutical companies deliver and develop medicines. We performed a fair value analysis
utilizing a combination of income approach and market approach to determine the fair value of each segment in order to appropriately allocate the goodwill between the segments as
of the announcement date. We reassigned goodwill using a relative fair value allocation method, which resulted in goodwill of a $105.7 million and $75.5 million being allocated to
Ligand core business and OminAb business, respectively.

After the closing date of the Transactions on November 1, 2022, the historical financial results of OmniAb have been reflected in our consolidated financial statements as
discontinued operations under GAAP for all periods presented through the date of the Distribution. Pursuant to the Transaction Agreements, Ligand contributed to OmniAb cash and
certain specific assets and liabilities constituting the OmniAb Business. Pursuant to the Distribution, Ligand distributed on a pro rata basis to its shareholders as of October 26, 2022
shares of the common stock of OmniAb representing 100% of Ligand’s interest in OmniAb. Immediately following the Distribution, Orwell Merger Sub Inc., a wholly-owned
subsidiary of APAC, merged with and into OmniAb, with OmniAb continuing as the surviving company in the Merger and as a wholly owned subsidiary of New OmniAb. The entire
transaction was completed on November 1, 2022, and following the Merger, New OmniAb is an independent, publicly traded company whose common stock trades on NASDAQ
under the symbol “OABI.” After the Distribution, we do not beneficially own any shares of common stock in OmniAb and no longer consolidate OmniAb into our financial results
for periods ending after November 1, 2022.

65

The transfer of assets and liabilities to OmniAb was effected through a contribution in accordance with the Merger Agreement, as summarized below (in thousands):

ASSETS

As of November 1, 2022

Current assets:

Cash and cash equivalents
Other current assets

Total current assets

Intangible assets, net
Goodwill
Property and equipment, net
Operating lease assets
Other assets

Total assets

Current liabilities:

Current contingent liabilities

      Deferred revenue

Current operating lease liabilities
Current finance lease liabilities
Total current liabilities
Long-term contingent liabilities
Deferred income taxes, net
Long-term operating lease liabilities
Other long-term liabilities

Total liabilities

Net assets transferred to OmniAb

Discontinued operations

LIABILITIES AND STOCKHOLDERS’ EQUITY

$

$

$

$

1,842 
9,019 
10,861 
165,422 
75,533 
19,921 
21,290 
1,449 
294,476 

1,569 
8,582 
1,610 
1 
11,762 
4,175 
18,978 
24,823 
5,006 
64,744 
229,732 

In connection with the Merger, the Company determined its antibody discovery business qualified for discontinued operations accounting treatment in accordance with ASC 205-20.
The following table summarizes revenue and expenses of the discontinued operations for the years ended December 31, 2022, 2021 and 2020 (in thousands):

Revenues:

Royalties
Contract revenue

Total revenues

Operating costs and expenses:
Amortization of intangibles
Research and development
General and administrative

Total operating costs and expenses

Loss from operations
Other income (expense):

Gain from short-term investments
Interest expense
Other income (expense), net

Total other expense, net
Loss before income tax
Income tax benefit
Net loss

2022

Year Ended December 31,
2021

2020

$

1,289 
25,275 
26,564 

$

— 
35,589 
35,589 

10,847 
38,466 
13,383 
62,696 
(36,132)

— 
— 
554 
554 
(35,578)
7,436 
(28,142)

$

12,945 
36,907 
10,693 
60,545 
(24,956)

1,266 
(7)
(1,210)
49 
(24,907)
5,692 
(19,215)

$

— 
22,857 
22,857 

11,800 
18,889 
3,823 
34,512 
(11,655)

1,900 
(5)
(2,070)
(175)
(11,830)
2,247 
(9,583)

$

$

66

There were no assets and liabilities related to discontinued operations as of December 31, 2022, as all balances were transferred to OmniAb upon Separation. The following table
summarizes the assets and liabilities of the discontinued operations as of December 31, 2021 (in thousands):

December 31, 2021

ASSETS

LIABILITIES

Current assets:

Other current assets

Total current assets of discontinued operations

Intangible assets, net
Goodwill
Property and equipment, net
Operating lease assets
Finance lease assets
Other assets

Total assets of discontinued operations

Current liabilities:

Current contingent liabilities

      Deferred revenue

Current operating lease liabilities
Current finance lease liabilities

Total current liabilities of discontinued operations

Long-term contingent liabilities
Deferred income taxes, net
Long-term operating lease liabilities
Other long-term liabilities

Total liabilities of discontinued operations

$

$

$

$

1,100 
1,100 
174,349 
75,533 
7,320 
13,332 
6 
243 
271,883 

2,538 
10,342 
685 
1 
13,566 
4,826 
28,239 
13,238 
9,225 
69,094 

The following table summarizes the significant non-cash items, capital expenditures of the discontinued operations, and financing activities that are included in the consolidated
statements of cash flows for the years ended December 31, 2022, 2021 and 2020 (in thousands):

Operating activities:

Change in fair value of contingent consideration
Depreciation and amortization
Stock-based compensation expense

Investing activities:

Cash paid for acquisition, net of cash acquired
Purchase of property, plant and equipment
Payments to CVR Holders

Financing activities:

Payments to CVR Holders

Supplemental cash flow disclosures:

Purchases of property, plant and equipment included in accounts payable and accrued expenses

2022

Year Ended December 31,
2021

2020

$

$

(554)
13,218 
9,404 

— 
(5,572)
(960)

$

$

1,210 
14,553 
9,457 

— 
(4,070)
(720)

2,070 
12,503 
5,602 

(27,127)
(1,753)
— 

(1,545)

$

(1,050)

$

(2,325)

2,310 

$

1,231 

$

— 

$

$

$

$

3. Short-term Investments: Investment in Viking

Our ownership in Viking was approximately 8.6% as of December 31, 2022, and we account for it as an investment in available-for-sale equity securities, which is measured at fair
value, with changes in fair value recognized in net income. Viking

67

is considered a related party as we maintain a seat on Viking's board of directors and we do not exert significant influence over Viking.

As of December 31, 2022 and December 31, 2021, we recorded our common stock in Viking in “short-term investments” at fair value of $63.1 million and $30.9 million,
respectively. At December 31, 2020, we owned warrants to purchase up to 1.5 million shares of Viking's common stock at an exercise price of $1.50 per share, and during the year
ended December 31, 2021 we exercised all outstanding Viking warrants. As of December 31, 2022 and December 31, 2021, we have zero Viking warrants outstanding. During the
year ended December 31, 2021, we also sold 0.6 million Viking shares. See further discussion in “Note (5), Fair Value Measurement.”

4. Acquisitions

Excluding the impact of OmniAb, we completed one acquisition from January 1, 2020 through December 31, 2022, where we applied the acquisition method of accounting for
business combinations. Accordingly, we recorded the tangible and intangible assets acquired and liabilities assumed at their estimated fair values as of the applicable date of
acquisition.

Pfenex Acquisition

On October 1, 2020, we acquired Pfenex, which develops next-generation and novel protein therapeutics to improve existing therapies and create new therapies for biological targets
linked to critical, unmet diseases using a protein expression technology platform.

The purchase price of $465.1 million included $429.6 million cash consideration paid upon acquisition, and a contingent CVR payment of up to $77.8 million in cash based on a
certain specified milestone with an estimated initial fair value of $37.0 million. The CVR will only be paid in full if the milestone is achieved by December 31, 2021. The amount of
the CVR included in purchase price was reduced by $1.5 million which was determined to be post-combination expense. The fair value of the CVR liability was determined using a
probability adjusted income approach. These cash flows were then discounted to present value using a discount rate based on market participants' cost of debt reflective of the
Company, which was 7.1%. The liability is periodically assessed based on events and circumstances related to the underlying milestone, and any change in fair value is recorded in
our consolidated statements of operations. During the year ended December 31, 2021, we wrote off the entire CVR liability of $37.6 million to other operation income, primarily due
to not achieving the specific development and regulatory milestone by December 31, 2021 as defined by Pfenex CVR.

In connection with the acquisition, a portion of Pfenex's equity awards that were outstanding and unvested prior to the acquisition became fully vested per the terms of the merger
agreement. The acceleration of vesting required us to allocate the fair value of the equity attributable to pre-combination service to the purchase price and the remaining amount was
considered our post-combination expense. We paid $17.3 million in cash for equity compensation, which is attributable to pre-combination services and is reflected as a component of
the total purchase price paid of $429.6 million. In addition, the fair value of equity compensation attributable to the post-combination service period was $8.7 million. These amounts
were associated with the accelerated vesting of stock options previously granted to Pfenex employees and were fully paid in cash, which was recognized as general and administrative
expenses during the fourth quarter of 2020.

We recorded $20.7 million of acquisition-related costs for legal, severance and other costs in connection with the acquisition within operating expenses in our consolidated statement
of operations for 2020. The following table sets forth an allocation of the purchase price to the identifiable tangible and intangible assets acquired and liabilities assumed, with the
excess recorded to goodwill (in thousands):

68

Cash
Restricted cash
Accounts and unbilled receivables
Property and equipment, net
Right-of-use asset
Other assets
Intangibles acquired
(1)
Goodwill
Accounts payable
Accrued liabilities
Deferred revenue
Lease liabilities
Other liabilities
Deferred tax liabilities, net

Total consideration

$

$

51,407 
200 
1,359 
7,823 
3,070 
1,338 
385,000 
82,303 
(6,814)
(9,606)
(3,908)
(3,070)
(1,382)
(42,622)
465,098 

(1) Goodwill represents the excess of the purchase price over the preliminary fair value of the underlying assets acquired and liabilities assumed. Goodwill is attributable to the assembled workforce of experienced
personnel at Pfenex and expected synergies. None of the goodwill is deductible for tax purposes.

The intangibles acquired and their weighted average useful life are as follows (in thousands, except useful lives):

Contractual Relationships:

Alvogen
Merck
Jazz
SII
Arcellx

Acquired Technologies

Approximate
Fair Value

Estimated useful life
(in years)

$

$

114,000 
117,000 
80,000 
49,000 
2,000 
23,000 
385,000 

12
12
17
10
17
10-19

The fair values of the contractual relationships were based on the discounted cash flow method that estimated the present value of the potential royalties, milestones and collaboration
revenue streams derived from the licensing of the related technologies over the estimated contractual relationship period. The fair values of the acquired technologies were based on
the discounted cash flow method that estimated the present value of the potential royalties, milestones, collaboration and product revenue streams derived from the licensing of the
related technologies over the estimated useful lives. These projected cash flows were discounted to present value using discount rate, which varies from 12% to 15%. The intangible
assets acquired are being amortized on a straight-line basis over the estimated useful life.

Approximately $2.0 million of revenue and $19.3 million of loss before income taxes of Pfenex were included in the consolidated statement of operations for the year ended
December 31, 2020. The following summary presents our unaudited pro forma consolidated results of operations for the years ended December 31, 2020 and December 31, 2019 as if
the Pfenex acquisition had occurred on January 1, 2019, which gives effect to certain transaction accounting adjustments, including amortization of acquired intangibles and stock
based compensation expense for retained Pfenex employees. The transaction accounting adjustments do not include non-recurring adjustments related to Pfenex's executive salary,
board of director compensation, and salary of Pfenex employees involved in the reduction of force as part of the acquisition, estimated to be $7.1 million in 2020 and $4.8 million in
2019. The pro forma financial information is not necessarily indicative of the operating results that would have occurred had the acquisition been consummated as if the date
indicated, nor is it necessarily indicative of future operating results (in thousands, except per share amounts):

69

(Unaudited)

Revenue
Net Income (loss)
Net income (loss) per common share:
    Basic
    Diluted

5. Fair Value Measurement

Year Ended December 31,
2019
2020

189,203  $
(60,059) $

(3.71) $
(3.71) $

170,608 
594,941 

31.32 
30.11 

$
$

$
$

We measure certain financial assets and liabilities at fair value on a recurring basis. Fair value is a market-based measurement that should be determined using assumptions that
market participants would use in pricing an asset or liability. We establish a three-level hierarchy to prioritize the inputs used in measuring fair value. The levels are described in the
below with level 1 having the highest priority and level 3 having the lowest:

Level 1 - Observable inputs such as quoted prices in active markets

Level 2 - Inputs other than the quoted prices in active markets that are observable either directly or indirectly

Level 3 - Unobservable inputs in which there is little or no market data, which require the Company to develop its own assumptions

70

The following table provides a summary of the assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2022 and 2021 (in thousands):

December 31, 2022

Fair Value Measurements at Reporting Date Using

Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)

Significant
Other
Observable
Inputs
(Level 2)

Significant
Unobservable
Inputs
(Level 3)

Total

 (1)

Assets:
Short-term investments
Investment in Viking common stock 
     Total assets
Liabilities:
Contingent liabilities - Cydex
Contingent liabilities - Metabasis 
Liability for amounts owed to a former licensor

(2)

(3)

     Total liabilities

December 31, 2021

(a)

 (1)

Assets:
Short-term investments
Investment in Viking common stock 
     Total assets
Liabilities:
Contingent liabilities - Cydex
Contingent liabilities - Metabasis 
Liability for amounts owed to a former licensor

(2)

(3)

$

$

$

$

103,742  $
63,122 
166,864  $

84  $

3,429 
44 
3,557  $

3,992  $

63,122 
67,114  $

—  $
— 
44 
44  $

99,615  $
— 
99,615  $

—  $

3,429 
— 
3,429  $

Fair Value Measurements at Reporting Date Using

Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)

Significant
Other
Observable
Inputs
(Level 2)

Significant
Unobservable
Inputs
(Level 3)

Total

$

$

$

$

290,697  $
30,889 
321,586  $

349  $

3,358 
86 
3,793  $

9,735  $

30,889 
40,624  $

—  $
— 
86 
86  $

280,553  $
— 
280,553  $

—  $

3,358 
— 
3,358  $

135 
— 
135 

84 
— 
— 
84 

409 
— 
409 

349 
— 
— 
349 

     Total liabilities

(a) Prior period amounts have been retrospectively adjusted to reflect the effects of the Separation.

(1) Excluding our investment in Viking, our short-term investments in marketable debt and equity securities are classified as available-for-sale securities based on management's intentions and are at level 2 of the fair
value hierarchy, as these investment securities are valued based upon quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant
assumptions are observable in the market. Short-term investments in mutual funds are valued at their net asset value (NAV) on the last day of the period. We have classified marketable securities with original
maturities of greater than one year as short-term investments based upon our ability and intent to use any and all of those marketable securities to satisfy the liquidity needs of our current operations. In addition, we
have investment in warrants resulting from Seelos Therapeutics Inc. milestone payments that were settled in shares during the first quarter of 2019 and are at level 3 of the fair value hierarchy, based on Black Scholes
value estimated by management on the last day of the period.

(2) Investment in Viking warrants, which we received as a result of Viking’s partial repayment of the Viking note receivable and our purchase of Viking common stock and warrants in April 2016, is classified as
level 1 as the fair value is determined using quoted market prices in active markets for the same securities. The change of the fair value is recorded in “gain (loss) from short-term investments” in our consolidated
statement of operations. See further discussion in “Note (3), Short-term Investments: Investment in Viking. ”

(3) In connection with our acquisition of Metabasis in January 2010, we issued Metabasis stockholders  four tradable CVRs, one CVR from each of four respective series of CVR, for each Metabasis share. The CVRs
entitle Metabasis stockholders to cash payments as frequently as every six months as cash is received by us from proceeds from the sale or partnering of any of the Metabasis drug development programs, among other
triggering events. The liability for the CVRs is determined using quoted prices in a market that is not active for the underlying CVR. The carrying amount of the liability may fluctuate significantly based upon quoted
market prices and actual amounts paid under the agreements may be materially differ than the carrying amount of the liability. Several of the Metabasis drug development programs have been outlicensed to Viking,
including VK2809. VK2809 is a novel selective TR-β agonist with potential in multiple indications, including hypercholesterolemia, dyslipidemia, NASH, and X-ALD. Under the terms of the agreement with Viking,
we may be entitled to up to $375.0 million of development, regulatory and commercial milestones and tiered royalties on potential future sales including a $ 10.0 million payment upon initiation of a Phase 3 clinical
trial.

71

A reconciliation of the level 3 financial instruments as of December 31, 2022 is as follows (in thousands):

Liabilities
Fair value of level 3 financial instruments as of December 31, 2021
Fair value adjustments to contingent liabilities

Fair value of level 3 financial instruments as of December 31, 2022

A reconciliation of the level 3 financial instruments as of December 31, 2021 is as follows (in thousands):

Liabilities
Fair value of level 3 financial instruments as of December 31, 2020
Payments to CVR holders and other contingency payments
Fair value adjustments to contingent liabilities

Fair value of level 3 financial instruments as of December 31, 2021

$

$

$

$

38,107

(37,708

Assets Measured on a Non-Recurring Basis

We apply fair value techniques on a non-recurring basis associated with valuing potential impairment losses related to our goodwill, indefinite-lived intangible assets, and long-lived
assets.

We evaluate goodwill and indefinite-lived intangible assets annually for impairment and whenever circumstances occur indicating that goodwill might be impaired. We determine the
fair value of our reporting unit based on a combination of inputs, including the market capitalization of Ligand, as well as Level 3 inputs such as discounted cash flows, which are not
observable from the market, directly or indirectly. We determine the fair value of our indefinite-lived intangible assets using the income approach based on Level 3 inputs.

Other than the finance lease equipment discussed in “Note (6), Leases”, there was no impairment of our goodwill, indefinite-lived assets, or long-lived assets recorded during the
twelve months ended December 31, 2022.

Fair Value of Financial Instruments

In May 2018, we issued the 2023 Notes. We use quoted market rates in an inactive market, which are classified as a Level 2 input, to estimate the fair value of our 2023 Notes. The
carrying value of the notes does not reflect the market rate. See “Note (7), Convertible Senior Notes” for additional information related to the fair value.

In addition, our accounts receivable, accounts payable, accrued liabilities, current deferred revenue, current operating lease liabilities, current financing lease liabilities are financial
instruments and are recorded at cost in the consolidated balance sheets. The estimated fair value of these financial instruments approximates their carrying value due to their short-
term nature.

6. Leases

Finance lease

In May 2020 and January 2021, we entered into an agreement and the first amendment with Hovione, our third-party manufacturer, to increase our manufacturing of Captisol,
respectively. The agreements are considered to include an embedded finance lease under ASC 842, Leases, as it provides the Company the right to use the underlying equipment to
exclusively manufacture Captisol. As of December 31, 2021, we have fully paid consideration of $69.1 million for prepaid inventory and capacity ramp-up fee. We allocated
consideration in the agreements between lease and non-lease components using relative standalone prices. Since the inception of the agreements, we have allocated $50.2 million of
the consideration paid to the non-lease component which is accounted for as prepaid inventory and being amortized to cost of Captisol based on the usage. The remaining balance of
$18.9 million was recognized as a right of use asset.

Given the current COVID status, our forecast for COVID-related Captisol has been significantly reduced, which triggered an indicator of impairment of the right of use asset as of
December 31, 2022. We performed a recoverability test at the asset group level by comparing the sum of the estimated undiscounted future cash flows attributable to the asset group to
its carrying value and identified the asset was impaired. We recorded a $9.8 million of impairment charge based on the fair value of the right of use asset which has been recognized in
cost of Captisol in our consolidated statement of operations for the year ended December 31, 2022. As of December 31, 2022 the remaining right of use asset balance is $4.0 million
which will be amortized straight-line over the remaining 6 years lease term.

72

Operating lease

We lease certain office facilities and equipment primarily under various operating leases. Our operating leases have remaining contractual terms up to ten years, some of which
include options to extend the leases for up to five years. Our lease agreements do not contain any material residual value guarantees, material restrictive covenants, or material
termination options. Our operating lease costs are primarily related to facility leases for administration offices and research and development facilities.

Lease assets and lease liabilities are recognized at the commencement of an arrangement where it is determined at inception that a lease exists. Lease assets represent the right to use
an underlying asset for the lease term, and lease liabilities represent the obligation to make lease payments arising from the lease. These assets and liabilities are initially recognized
based on the present value of lease payments over the lease term calculated using our incremental borrowing rate generally applicable to the location of the lease asset, unless the
implicit rate is readily determinable. Lease assets also include any upfront lease payments made and lease incentives. Lease terms include options to extend or terminate the lease
when it is reasonably certain that those options will be exercised.

In addition to base rent, certain of our operating leases require variable payments, such as insurance and common area maintenance. These variable lease costs, other than those
dependent upon an index or rate, are expensed when the obligation for those payments is incurred. Leases with an initial term of 12 months or less are not recorded on the balance
sheet, and the expense for these short-term leases and for operating leases is recognized on a straight-line basis over the lease term.

The depreciable life of lease assets and leasehold improvements is limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of
exercise.

Operating and Finance Lease Assets and Liabilities (in thousands):

Assets
Operating lease assets
Finance lease assets

                 Total lease assets

Liabilities
Current operating lease liabilities
Current finance lease liabilities

Long-term operating lease liabilities
Long-term finance lease liabilities

                  Total lease liabilities

(a) Prior period amounts have been retrospectively adjusted to reflect the effects of the Separation.

Maturity of Operating and Finance Lease Liabilities as of December 31, 2022 (in thousands):

Maturity Dates
2023
2024
2025
2026
2027
Thereafter
Total lease payments
Less imputed interest

Present value of lease liabilities

December 31, 2022

December 31, 2021

(a)

10,914 
4,095 
15,009 

670 
45 
715 
10,336 
5 
11,056 

$

$

$

$

3,210 
16,201 
19,411 

1,368 
45 
1,413 
2,256 
58 
3,727 

Operating Leases

Finance Leases

1,425 
1,483 
1,576 
1,621 
1,667 
7,614 
15,386 
(4,380)
11,006 

$

$

49 
2 
— 
— 
— 
— 
51 
(1)
50 

$

$

$

$

$

$

As of December 31, 2022, our operating leases have a weighted-average remaining lease term of 9.3 years and a weighted-average discount rate of 7.1%. As of December 31, 2021,
our operating leases have a weighted-average remaining lease term of 2.9 years and a weighted-average discount rate of 5.1%. Cash paid for amounts included in the measurement of
operating lease liabilities was $1.7 million and $1.5 million for the twelve months ended December 31, 2022 and 2021, respectively. Operating lease expense was $0.7 million (net of
sublease income of $0.7 million) and $1.0 million (net of sublease income of $0.4 million) for the twelve months ended December 31, 2022 and 2021, respectively.

73

As of December 31, 2022, our finance leases have a weighted-average remaining lease term of 1.1 years and a weighted-average discount rate of 4.1%. As of December 31, 2021, our
finance leases have a weighted-average remaining lease term of 2.1 years and a weighted-average discount rate of 4.1%. We excluded the Hovione equipment lease in the calculation
of weighted average remaining lease term and weighted average discount rate because the Hovione lease was fully paid off as of December 31, 2021. Cash paid for amounts included
in the measurement of these finance lease liabilities was $0.05 million and $9.3 million for the twelve months ended December 31, 2022 and 2021, respectively. Finance lease
expense was $2.3 million and $2.3 million for the twelve months ended December 31, 2022 and 2021, respectively.

7. Convertible Senior Notes

0.75% Convertible Senior Notes due 2023

In May 2018, we issued $750 million aggregate principal amount of 2023 Notes, bearing cash interest at a rate of 0.75% per year, payable semi-annually. The net proceeds from the
offering, after deducting the initial purchasers' discount and offering expenses, were approximately $733.1 million. The 2023 Notes will be convertible into cash, shares of common
stock, or a combination of cash and shares of common stock, at our election, based on a conversion rate as discussed below.

Holders of the 2023 Notes were entitled to convert the notes at any time prior to the close of business on the business day immediately preceding November 15, 2022, under any of the
following circumstances:

(1) during any fiscal quarter (and only during such fiscal quarter) commencing after September 30, 2018, if, for at least 20 trading days (whether or not consecutive) during

the 30 consecutive trading day period ending on the last trading day of the immediately preceding fiscal quarter, the last reported sale price of our common stock on such trading day
was greater than 130% of the conversion price on such trading day;

(2) during the five business day period immediately following any 10 consecutive trading day period, in which the trading price per $1,000 principal amount of notes was less

than 98% of the product of the last reported sale price of our common stock on such trading day and the conversion rate on each such trading day; or

(3) upon the occurrence of certain specified corporate events as specified in the indenture governing the notes.

In advance of the Distribution of the shares of common stock of OmniAb to Ligand’s shareholders on November 1, 2022, a notice of convertibility was delivered to the holders of the
2023 Notes. No holders exercised their right to convert their 2023 Notes during the applicable period for conversion. After we completed the Separation of the OmniAb Business, on
November 15, 2022, the conversion rate was adjusted to 4.8390 shares of common stock per $1,000 principal amount of the 2023 Notes which represents a conversion price of
approximately $206.65 per share. The maximum conversion rate of the 2023 Notes was adjusted to 6.2907 per $1,000 principal amount of the 2023 Notes which represents a
conversion price of approximately $158.97. The conversion rate for the 2023 Notes was adjusted in accordance with the requirements of the Indenture based on calculations
determined with reference to a valuation period of the first 10 consecutive trading days after, and including, the ex-dividend date of the spin-off (as determined in the Indenture). The
conversion rate and maximum conversion rate are subject to further adjustment under the circumstances and pursuant to the terms set forth in the Indenture.

The notes will have a dilutive effect to the extent the average market price per share of common stock for a given reporting period exceeds the current conversion price of $206.65. In
connection with the issuance of the 2023 Notes, we incurred $16.9 million of issuance costs, which primarily consisted of underwriting, legal and other professional fees. The portion
of these costs allocated to the liability component totaling $13.7 million is amortized to interest expense using the effective interest method over the five years expected life of the
2023 Notes, and the effective interest rate as of December 31, 2022 is 0.5%. During the year ended December 31, 2022 we recognized a total of $1.8 million in interest expense which
includes $1.1 million in contractual interest expense and $0.7 million in amortized issuance costs.

It is our intent and policy to settle conversions through combination settlement, which essentially involves payment in cash equal to the principal portion and delivery of shares of
common stock for the excess of the conversion value over the principal portion.

During 2021, we repurchased $152.0 million in principal of the 2023 Notes for $156.0 million in cash, including accrued interest of $0.3 million. We accounted for the repurchase as a
debt extinguishment, which resulted in (1) a loss of $7.3 million reflected in other income (expense), net, in our consolidated statement of operations for the year ended December 31,
2021, (2) a $13.7 million reduction in debt discount, and (3) a $10.2 million reduction to additional paid in capital, related to the reacquisition of the equity component in our
consolidated balance sheet as of December 31, 2021. After the repurchases, approximately $343.3 million in principal amount of the 2023 Notes remain outstanding.

74

During 2022, we repurchased $266.4 million in principal amount of the 2023 Notes for $261.4 million in cash, including accrued interest of $0.5 million We accounted for the
repurchase as a debt extinguishment, which resulted in a gain of $4.2 million reflected in other income (expense), net, in our consolidated statement of operations for the year ended
December 31, 2022, and a $1.3 million reduction in debt discount. After the repurchases, approximately $76.9 million in principal amount of the 2023 Notes remain outstanding.

Convertible Bond Hedge and Warrant Transactions

In conjunction with the 2023 Notes, in May 2018, we entered into convertible bond hedges and sold warrants covering 3,018,327 shares of our common stock to minimize the impact
of potential dilution to our common stock and/or offset the cash payments we are required to make in excess of the principal amount upon conversion of the 2023 Notes. The
convertible bond hedges have an exercise price of $206.65 per share and are exercisable when and if the 2023 Notes are converted. We paid $140.3 million for these convertible bond
hedges. If upon conversion of the 2023 Notes, the price of our common stock is above the exercise price of the convertible bond hedges, the counterparties will deliver shares of
common stock and/or cash with an aggregate value approximately equal to the difference between the price of common stock at the conversion date and the exercise price, multiplied
by the number of shares of common stock related to the convertible bond hedge transaction being exercised. The convertible bond hedges and warrants described below are separate
transactions entered into by us and are not part of the terms of the 2023 Notes. Holders of the 2023 Notes and warrants will not have any rights with respect to the convertible bond
hedges.

Concurrently with the convertible bond hedge transactions, we entered into warrant transactions whereby we sold warrants covering 3,018,327 shares of common stock with an
exercise price of $315.38 per share, subject to certain adjustments. We received $90.0 million for these warrants. The warrants have various expiration dates ranging from August 15,
2023 to February 6, 2024. The warrants will have a dilutive effect to the extent the market price per share of common stock exceeds the applicable exercise price of the warrants, as
measured under the terms of the warrant transactions. The common stock issuable upon exercise of the warrants will be in unregistered shares, and we do not have the obligation and
do not intend to file any registration statement with the SEC registering the issuance of the shares under the warrants.

In April 2020, in connection with the repurchases of $234.4 million in principal of the 2023 Notes for $203.8 million in cash, including accrued interest of $0.6 million, during the
quarter ended March 31, 2020, we entered into amendments with Barclays Bank PLC, Deutsche Bank AG, London Branch, and Goldman Sachs & Co. LLC to the convertible note
hedges transactions we initially entered into in connection with the issuance of the 2023 Notes. The amendments provide that the options under the convertible note hedges
corresponding to such repurchased 2023 Notes will remain outstanding notwithstanding such repurchase.

In January 2021, in connection with the repurchases of approximately $20.3 million in principal of the 2023 Notes for approximately $19.1 million in cash, including accrued interest
of $0.1 million, during the quarter ended December 31, 2020, we entered into amendments with Barclays Bank PLC, Deutsche Bank AG, London Branch, and Goldman Sachs & Co.
LLC to the convertible note hedges transactions we initially entered into in connection with the issuance of the 2023 Notes. The amendments provide that the options under the
convertible note hedges corresponding to such repurchased 2023 Notes will remain outstanding notwithstanding such repurchase.

During the year ended December 31, 2021, in connection with the repurchases of $152.0 million in principal of the 2023 Notes for $156.0 million in cash, including accrued interest
of $0.3 million, we entered into Warrant Early Unwind Agreements and Bond Hedge Unwind Agreements with Barclays Bank PLC, Deutsche Bank AG, and Goldman Sachs & Co.
LLC to unwind a portion of the convertible note hedges transactions we initially entered into in connection with the issuance of the 2023 Notes. We paid $18.4 million as part of the
Warrant Early Unwind Agreements reducing the number of shares covered by the warrants from 3,018,327 to 2,559,254. We received $18.9 million as part of the Bond Hedge Early
Unwind Agreements reducing the number of options under the convertible bond hedges to 598,021. These unwind transactions resulted in a $0.5 million net increase in additional
paid-in-capital in our consolidated balance sheet as of December 31, 2021.

In August 2022, in connection with the repurchases of $227.8 million in principal of the 2023 Notes for $223.7 million in cash, including accrued interest of $0.4 million made during
the six months ended June 30, 2022, we entered into Bond Hedge Unwind Agreements with Barclays Bank PLC, Deutsche Bank AG, and Goldman Sachs & Co. LLC to unwind a
portion of the convertible note hedges transactions we initially entered into in connection with the issuance of the 2023 Notes. We received $0.2 million as part of these Bond Hedge
Early Unwind Agreements reducing the number of options under the convertible bond hedges to 370,219 as of December 31, 2022. This transaction resulted in a $0.2 million net
increase in additional paid-in-capital in our consolidated balance sheet as of December 31, 2022.

75

The following table summarizes information about the equity and liability components of the 2023 Notes (in thousands).

Principal amount of 2023 Notes outstanding
Unamortized discount (including unamortized debt issuance cost)

Total long-term portion of notes payable

Fair value of convertible senior notes outstanding (Level 2)

As of December 31, 2022, there were no events of default or violation of any covenants under our financing obligations.

December 31, 2022

December 31, 2021

$

$

$

76,854  $
(159)
76,695  $

343,301 
(22,584)
320,717 

74,789  $

341,801 

8. Balance Sheet Account Details

Short-term Investments

Excluding our investments in Viking, the following table summarizes the various investment categories at December 31, 2022 and 2021 (in thousands):
Gross unrealized
losses

Gross unrealized
gains

Cost

December 31, 2022
Short-term investments

Mutual Funds
Bank deposits
     Commercial paper
Corporate bonds
Corporate equity securities
U.S. government securities
Warrants

December 31, 2021
Short-term investments
     Mutual fund
     Bank deposits
     Commercial paper
     Corporate bonds
     Corporate equity securities
     U.S. government securities
     Warrants

$

$

$

$

81,815  $
5,012 
7,211 
6,701 
5,807 
2,232 
— 
108,778  $

152,136  $
63,389 
36,008 
29,308 
5,807 
5,577 
— 
292,225  $

— 
2 
3 
13 
262 
— 
135 
415 

— 
13 
2 
17 
402 
— 
408 
842 

$

$

$

$

(1050) $
(34)
— 
(58)
(4,239)
(70)
— 
(5,451) $

(249) $
(21)
(12)
(38)
(2,027)
(23)
— 
(2,370) $

Estimated
fair value

80,765 
4,980 
7,214 
6,656 
1,830 
2,162 
135 
103,742 

151,887 
63,381 
35,998 
29,287 
4,182 
5,554 
408 
290,697 

Gain (loss) from short-term investments on our consolidated statements of operations includes both realized and unrealized gain (loss) from our short-term investments in public
equity and warrant securities, and realized gain (loss) from available-for-sale debt securities.
The following table summarizes our available-for-sale debt securities by contractual maturity (in thousands):

Within one year
After one year through five years

     Total

December 31, 2022

Amortized Cost

Fair Value

$

$

57,158  $
2,794 
59,952  $

57,036 
2,769 
59,805 

76

The following table summarizes our available-for-sale debt securities in an unrealized loss position (in thousands):

December 31, 2022
Bank deposits
Corporate bonds
Commercial paper
U.S. Government Securities

     Total

December 31, 2021
Bank deposits
Corporate bonds
Commercial paper
U.S. Government Securities

     Total

$

$

$

$

Less than 12 months

12 months or greater

Total

Gross
Unrealized
Losses

Estimated
Fair Value

Gross
Unrealized
Losses

Estimated
Fair Value

Gross
Unrealized
Losses

Estimated
Fair Value

(34) $
(21)
— 
(70)
(125) $

(13) $
(15)
(6)
— 
(34) $

2,470  $
3,887 
3,836 
2,161 
12,354  $

20,008  $
27,252 
6,689 
— 
53,949  $

—  $
(37)
— 
— 
(37) $

—  $
(5)
(32)
(23)
(60) $

—  $

947 
— 
— 
947  $

—  $

2,996 
10,125 
5,553 
18,674  $

(34) $
(58)
— 
(70)
(162) $

(13) $
(20)
(38)
(23)
(94) $

2,470 
4,834 
3,836 
2,161 
13,301 

20,008 
30,248 
16,814 
5,553 
72,623 

Our investment policy is capital preservation and we only invested in U.S.-dollar denominated investments. We held a total of 12 positions which were in an unrealized loss position
as of December 31, 2022. We believe that we will collect the principal and interest due on our debt securities that have an amortized cost in excess of fair value. The unrealized losses
are largely due to changes in interest rates and not to unfavorable changes in the credit quality associated with these securities that impacted our assessment on collectability of
principal and interest. We do not intend to sell these securities nor do we believe that we will be required to sell these securities before the recovery of the amortized cost basis.
Accordingly, no credit losses were recognized for the twelve months ended December 31, 2022.

Property and equipment are stated at cost and consists of the following (in thousands):

Lab and office equipment
Leasehold improvements
Computer equipment and software

Less accumulated depreciation and amortization

December 31,

2022

2021

$

$

14,172  $
7,446 
989 
22,607 
(10,125)
12,482  $

13,417 
5,265 
924 
19,606 
(6,415)
13,191 

Depreciation of equipment is computed using the straight-line method over the estimated useful lives of the assets which ranges from three to ten years. Leasehold improvements are
amortized using the straight-line method over their estimated useful lives or their related lease term, whichever is shorter. Depreciation expense of $3.8 million, $2.4 million, and $1.5
million was recognized for the twelve months ended December 31, 2022, 2021, and 2020, respectively, and was included in operating expenses.

77

Goodwill and identifiable intangible assets consist of the following (in thousands):

Indefinite-lived intangible assets
     Goodwill
Definite-lived intangible assets
     Complete technology
          Less: Accumulated amortization
     Trade name
          Less: Accumulated amortization
     Customer relationships
          Less: Accumulated amortization
     Contractual relationships

Less: Accumulated amortization

December 31,

2022

2021

$

105,673  $

105,673 

55,211 
(22,560)
2,642 
(1,577)
29,600 
(17,670)
362,000 
(65,191)
448,128  $

55,211 
(18,916)
2,642 
(1,444)
29,600 
(16,184)
362,000 
(36,218)
482,364 

Total goodwill and other identifiable intangible assets, net

$

Amortization of finite-lived intangible assets is computed using the straight-line method over the estimated useful life of the asset of up to 20 years. Amortization expense of $34.2
million, $34.2 million, and $11.6 million was recognized for the years ended December 31, 2022, 2021, and 2020, respectively. Estimated amortization expense for the years ending
December 31, 2023 through 2027 is $34.1 million per year. For each of the years ended December 31, 2022, 2021, and 2020, there was no material impairment of intangible assets
with finite lives.

Accrued liabilities consist of the following (in thousands):

Compensation
Professional fees
Amounts owed to former licensees
Royalties owed to third parties
Return reserve and customer refunds
Acquisition related liabilities
Subcontractor
Supplier
Other

Contingent liabilities:

December 31,

2022

2021

$

$

6,201  $
662 
3,989 
12 
— 
— 
— 
634 
4,183 
15,681  $

6,532 
2,046 
630 
149 
2,420 
1,000 
1,759 
848 
2,195 
17,579 

In connection with the acquisition of CyDex in January 2011, we issued a series of CVRs and also assumed certain contingent liabilities. We may be required to make additional
payments upon achievement of certain clinical and regulatory milestones to the CyDex shareholders and former license holders.

In connection with the acquisition of Metabasis in January 2010, we entered into four CVR agreements with Metabasis shareholders. The CVRs entitle the holders to cash payments as
frequently as every six months as proceeds are received by us upon the sale or licensing of any of the Metabasis drug development programs and upon the achievement of specified
milestones.

For CVRs associated with the Pfenex, see “Note (4), Acquisitions” for more information.

The following table summarizes roll-forward of contingent liabilities as of December 2022 and 2021 (in thousands):

78

 
 
Cydex
Metabasis
Pfenex

December 31, 2020

Payments

Fair Value
Adjustment

December 31, 2021

Payments

Fair Value
Adjustment

Repurchases

$

Total $

507  $

3,822 
37,600 
41,929  $

(50) $
— 
— 
(50) $

(108) $
(464)
(37,600)
(38,172) $

349  $

3,358 
— 
3,707  $

—  $
— 
— 
—  $

(265) $
71 
— 
(194) $

December 31, 2022
84 
3,429 
— 
3,513 

—  $
— 
— 
—  $

9. Stockholders’ Equity

Share-based Compensation Expense

The following table summarizes share-based compensation expense from continuing operations (in thousands):

Share-based compensation expense as a component of:
Research and development expenses
General and administrative expenses

(a) Prior period amounts have been retrospectively adjusted to reflect the effects of the Separation.

Conversion and Modification of Equity Awards Outstanding at Separation Date

2022

December 31,
2021

(a)

2020

(a)

$

$

10,970  $
39,911 
50,881  $

9,341  $

19,985 
29,326  $

8,513 
16,612 
25,125 

In connection with the OmniAb Separation on November 1, 2022, under the provisions of the existing plans, we adjusted our outstanding equity awards in accordance with the Merger
Agreement to preserve the intrinsic value of the awards immediately before and after the Distribution. Upon the Distribution, employees holding stock options, restricted stock units
and performance restricted stock units denominated in pre-Distribution Ligand stock received a number of otherwise-similar awards either in post-Distribution Ligand stock or in a
combination of post-Distribution Ligand stock and OmniAb stock based on conversion ratios outlined for each group of employees in the Merger Agreement that we entered into in
connection with the Distribution. The equity awards that were granted prior to March 2, 2022 were converted under the shareholder method, wherein employees holding outstanding
equity awards received equity awards in both Ligand and OmniAb. For equity awards granted after March 2, 2022, for Ligand employees, the number of awards that were outstanding
at the Separation were proportionately adjusted into post-Distribution Ligand stock to maintain the aggregate intrinsic value of the awards at the date of the Separation; for OmniAb
employees, the number of awards that were outstanding at the Separation were proportionately adjusted into post-Distribution OmniAb stock to maintain the aggregate intrinsic value
of the awards at the date of the Separation. The conversion ratio was determined based on the relative values of Ligand common stock in the “regular way” and “ex-distribution”
markets during the five-trading day period prior to the closing of the business combination.

These modified awards otherwise retained substantially the same terms and conditions, including term and vesting provisions. Additionally, we will not incur any future compensation
cost related to equity awards held by OmniAb employees and directors. We will incur future compensation cost related to OmniAb equity awards held by our employees.

Stock Plans

In June 2022, our stockholders approved the amendment and restatement of the Ligand Pharmaceuticals Incorporated 2002 Stock Incentive Plan (the “2002 Plan”). The amended and
restated 2002 Plan, which is referred to herein as the “Restated Plan” was amended to increase the shares available for issuance by 1.0 million.

On July 29, 2022, our board of directors (the “Board”) approved the Ligand Pharmaceuticals Incorporated 2022 Employment Inducement Plan (the “2022 Inducement Plan”). The
terms of the 2022 Inducement Plan are substantially similar to the terms of the Restated Plan with the exception that incentive stock options may not be issued under the 2022
Inducement Plan and awards under the 2022 Inducement Plan may only be issued to eligible recipients under the applicable Nasdaq Listing Rules. The 2022 Inducement Plan was
adopted by the Board without stockholder approval pursuant to Rule 5635(c)(4) of the Nasdaq Listing Rules. The Board has initially reserved 300,000 shares of the Company’s
common stock for issuance pursuant to awards granted under the 2022 Inducement Plan.

As of December 31, 2022, there were 1.3 million shares available for future option grants or direct issuance under the Restated Plan and the 2022 Inducement Plan.

79

Following is a summary of our stock option plan activity and related information:

Balance at January 1, 2020
Granted
Exercised
Forfeited
Balance at December 31, 2020

Exercisable at December 31, 2020
Options vested and expected to vest as of December 31, 2020
Granted
Exercised
Forfeited
Balance at December 31, 2021

Exercisable at December 31, 2021
Options vested and expected to vest as of December 31, 2021
Granted
Exercised
Forfeited
Balance at October 31, 2022

Exercisable at October 31, 2022
Options vested and expected to vest as of October 31, 2022, before Separation and
Regrant
Cancellation due to Separation, Before Regrant
Balance at November 1, 2022, Before Regrant

(1)

Granted 
Exercised
Forfeited
Balance at December 31, 2022

Exercisable at December 31, 2022
Options vested and expected to vest as of December 31, 2022

Shares

Weighted
Average
Exercise
Price

1,956,379  $
806,300  $
(156,845) $
(44,012) $
2,561,822  $
1,611,830  $
2,561,822  $
393,589  $
(619,731) $
(136,082) $
2,199,598  $
1,391,952  $
2,199,598  $
863,245  $
(34,941) $
(40,069) $
2,987,833  $
1,769,629  $

2,987,833  $
(2,987,833)
— 

3,584,760  $
(50,449) $
(542,838) $
2,991,473  $
1,559,662  $
2,991,473  $

77.54 
92.93 
21.26 
91.30 

85.59 
76.05 
85.59 
159.12 
54.28 
110.83 

106.00 
98.16 
106.00 
91.34 
38.56 
78.46 

102.92 
102.38 

102.92 

60.10 
30.24 
56.20 

61.31 
60.83 
61.31 

Weighted
Average
Remaining
Contractual
Term in
Years

Aggregate
Intrinsic
Value
(In thousands)

5.45 $

72,002 

6.09 $
4.54 $
6.09 $

59,033 
53,286 
59,033 

6.34 $
5.12 $
6.34 $

113,302 
80,849 
113,302 

0 $
0 $

0 $

14,835 
13,722 

14,835 

6.07 $
4.51 $
6.07 $

30,477 
17,951 
30,477 

(1) Options granted primarily relate to the modifications in connection with the Separation which resulted in new stock option grants at the modification date fair value.

The weighted-average grant-date fair value of all stock options granted during 2022, 2021 and 2020 was $28.90, $80.08, and $41.39 per share, respectively. The total intrinsic value of
all options exercised during 2022, 2021 and 2020 was approximately $4.6 million, $77.3 million, and $11.9 million, respectively.

Cash received from options exercised, net of fees paid, in 2022, 2021 and 2020 was $2.6 million, $33.0 million and $2.5 million, respectively.

80

 
Following is a further breakdown of the options outstanding as of December 31, 2022:

Range of exercise prices
$12.78-$43.36
$46.20-$52.78
$52.84-$52.84
$54.81-$57.22
$58.28-$67.03
$67.24-$69.70
$70.04-$93.12
$99.80-$99.80
$103.42-$103.42
$114.15-$114.15

Options
outstanding

395,660 
279,405 
580,629 
391,280 
477,042 
403,187 
254,738 
3,389 
193,177 
12,966 
2,991,473 

Weighted
average
remaining  life
in years
2.32
6.63
7.59
6.47
5.78
6.93
5.56
5.84
7.26
5.47
6.07

$
$
$
$
$
$
$
$
$
$
$

Weighted average
exercise price

Options
exercisable

Weighted average
exercise price

35.76 
50.24 
52.84 
56.24 
64.11 
68.98 
87.72 
99.80 
103.42 
114.15 
61.31 

366,426  $
122,734  $
88,647  $
198,283  $
274,719  $
207,981  $
204,332  $
3,389  $
80,185  $
12,966  $
1,559,662  $

35.44 
50.18 
52.84 
56.26 
62.90 
68.60 
89.21 
99.80 
103.42 
114.15 
60.83 

The assumptions used for the specified reporting periods and the resulting estimates of weighted-average grant date fair value per share of options granted:

Risk-free interest rate
Expected volatility
Expected term

2022
1.4%-4.3%
49%-55%
2.0 to 6.5 years

Year Ended December 31,
2021
0.4%-1.2%
47%-63%
4.7 to 6.3 years

2020
0.2%-1.4%
47%-71%
4.7 to 5.1 years

As of December 31, 2022, there was $32.7 million of total unrecognized compensation cost related to non-vested stock options under the 2002 Plan. That cost is expected to be
recognized over a weighted average period of 2.7 years.

As of December 31, 2022, there was $4.8 million of total unrecognized compensation cost related to non-vested OmniAb stock options received upon aforementioned spin-off
conversion. That cost is expected to be recognized over a weighted average period of 1.8 years.

81

 
 
Restricted Stock Activity

The following is a summary of our restricted stock activity and related information: 

Outstanding at January 1, 2020
Granted
Vested
Forfeited
Outstanding at January 1, 2021

Granted
Vested
Forfeited
Outstanding at December 31, 2021

Granted
Vested
Forfeited
Outstanding at October 31, 2022, before Separation and Regrant

Forfeited due to Separation, Before Regrant
Balance at November 1, 2022, Before Regrant

Granted
Vested
Forfeited
Balance at December 31, 2022

Shares

Weighted-Average
Grant Date Fair
Value

147,259  $
111,306  $
(52,363) $
—  $
206,202  $
167,292  $
(98,501) $
(10,850) $
264,143  $
260,577  $
(138,867) $
(19,383) $
366,470  $
(366,470)
— 

424,473  $
(73,385) $
(2,635) $
348,453  $

125.11 
89.73 
121.69 
— 

106.88 
169.63 
125.59 
141.85 

138.21 
89.99 
120.57 
58.45 

114.83 

75.61 
75.17 
89.05 

75.60 

As of December 31, 2022, unrecognized compensation cost related to non-vested stock awards under the 2002 Plan amounted to $12.4 million. That cost is expected to be recognized
over a weighted average period of 1.7 years.

As of December 31, 2022, there was $1.2 million of total unrecognized compensation cost related to non-vested OmniAb stock awards received upon aforementioned spin-off
conversion. That cost is expected to be recognized over a weighted average period of 1.0 years.

Employee Stock Purchase Plan

As of December 31, 2022, 35,881 shares of our common stock are available for future issuance under the Amended Employee Stock Purchase Plan, or ESPP. The ESPP permits
eligible employees to purchase up to 1,250 shares of Ligand common stock per calendar year at a discount through payroll deductions. The price at which stock is purchased under the
ESPP is equal to 85% of the fair market value of the common stock on the first of a six month offering period or purchase date, whichever is lower. There were 8,479, 8,448 and 6,455
shares issued under the ESPP in 2022, 2021 and 2020, respectively.

Share Repurchases

In September 2019, our Board of Directors approved a stock repurchase program authorizing the repurchase of up to $500.0 million of our common stock from time to time over a
period of up to three years. This repurchase program expired in September 2022. During the year ended December 31, 2022 and 2021, we did not repurchase any common stock,
respectively. During the year ended December 31, 2020, we repurchased 934,079 shares for $78.0 million.

At-the Market Equity Offering Program

On September 30, 2022, we filed a registration statement on Form S-3 (the “Shelf Registration Statement”), which became automatically effective upon filing, covering the offering
of common stock, preferred stock, debt securities, warrants and units.

On September 30, 2022, we also entered into an At-The-Market Equity Offering Sales Agreement (the “Sales Agreement”) with Stifel, Nicolaus & Company, Incorporated (the
“Agent”), under which we may, from time to time, sell shares of our common stock having an aggregate offering price of up to $100.0 million in “at the market” offerings through the
Agent (the

82

“ATM Offering”). The Shelf Registration Statement included a prospectus covering the offering, issuance and sale of up to $100.0 million of our common stock from time to time
through the ATM Offering. The shares to be sold under the Sales Agreement may be issued and sold pursuant to the Shelf Registration Statement. To date, we have not issued any
shares of common stock in the ATM Offering.

10. Commitment and Contingencies: Legal Proceedings

We record an estimate of a loss when the loss is considered probable and estimable. Where a liability is probable and there is a range of estimated loss and no amount in the range is
more likely than any other number in the range, we record the minimum estimated liability related to the claim in accordance with ASC 450, Contingencies. As additional information
becomes available, we assess the potential liability related to our pending litigation and revises our estimates. Revisions in our estimates of potential liability could materially impact
our results of operations.

On October 31, 2019, we received three civil complaints filed in the U.S. District Court for the Northern District of Ohio on behalf of several Indian tribes. The Northern District of
Ohio is the Court that the Judicial Panel on Multi-District Litigation (“JPML”) has assigned more than one thousand civil cases which have been designated as a Multi-District
Litigation (“MDL”) and captioned In Re: National Prescription Opiate Litigation. The allegations in these complaints focus on the activities of defendants other than the Company and
no individualized factual allegations have been advanced against us in any of the three complaints. We reject all claims raised in the complaints and intend to vigorously defend these
matters.

CyDex, a wholly owned subsidiary of Ligand, and Baxter Healthcare Corp. (“Baxter”) are parties to a license agreement relating to Ligand’s Captisol® technology and, more
specifically, relating to Captisol®-enabled Nexterone® (amiodarone HCl premixed injection). CyDex contended that Baxter has not paid all of the royalties due to CyDex under the
terms of the license agreement and Baxter contends that it has overpaid royalties for several years. On April 6, 2021, Baxter initiated an arbitration with AAA pursuant to the
arbitration provision of the license agreement. On April 21, 2021, CyDex filed an answering statement and counterdemand. On December 2, 2021, Baxter filed an Amended Notice
of Arbitration Demand seeking a declaration limiting the “royalty term” of the license agreement to “the later of i) the expiration of the licensed [p]atent; or ii) when there are no
longer any CyDex patents listed in the Orange Book for [Nexterone®].” Baxter later clarified its position, and asserted that royalties should have ceased being due upon the May 4,
2022 expiry of CyDex’s U.S. Patent No. 6,869,939. The parties conducted a three-day arbitration hearing May 24-26, 2022. In a September 9, 2022 Final Award, the Tribunal ruled in
CyDex’s favor by (1) denying Baxter’s request for a partial refund of previously paid royalties, (2) granting CyDex’s request for underpaid royalties, and (3) concluding that “[g]oing
forward Baxter shall pay CyDex” a royalty consistent with CyDex’s construction of the license agreement until, at least, the March 13, 2029 expiry of CyDex’s U.S. Patent No.
7,635,773.

On April 22, 2022, Pfenex Inc. (“Pfenex”), a wholly owned subsidiary of Ligand, received a notice of alleged breach from Beijing Kangchen Biological Technology Co., Ltd.
(“Kangchen”) with respect to a Development and License Agreement , dated April 18, 2018, between Pfenex and Kangchen (“License Agreement”) pertaining to the development
and commercialization of teriparatide in certain Southeast Asian countries. The allegations in the notice focused on the activities of Pfenex and other parties. On June 16, 2022, we
rejected all claims raised by Kangchen in the notice. On June 24, 2022, Kangchen served Pfenex a notice of termination of the License Agreement and demanded initiation of the
dispute resolution process in accordance with the License Agreement. On June 29, 2022, we again rejected all claims raised by Kangchen in the notice of termination and agreed to
engage in the applicable dispute resolution process, including good faith negotiations between the parties. On October 20, 2022, we agreed to make a single lump sum payment to
Kangchen in connection with a termination agreement that, among other things, terminates the License Agreement and releases all claims between the parties arising from the License
Agreement. The payment was recorded as general and administrative expense during the year ended December 31, 2022. A termination agreement between Pfenex and Kangchen
went into effect in December 2022.

From time to time, we may also become subject to other legal proceedings or claims arising in the ordinary course of our business. We currently believe that none of the claims or
actions pending against us is likely to have, individually or in the aggregate, a material adverse effect on our business, financial condition or results of operations. Given the
unpredictability inherent in litigation, however, we cannot predict the outcome of these matters.

11. Income Taxes

83

The components of the income tax expense (benefit) for continuing operations are as follows (in thousands):

Current expense (benefit):

Federal
State
Foreign

Deferred expense (benefit):

Federal
State

Total income tax expense (benefit)

2022

Year Ended December 31,
2021

2020

$

$

10,097 
193 
452 
10,742 

(3,656)
34,144 
30,488 
41,230 

$

$

460  $
(22)
— 
438 

(2,901)
(1,685)
(4,586)
(4,148) $

10,820 
541 
23 
11,384 

(13,456)
(3,234)
(16,690)
(5,306)

A reconciliation of income tax expense (benefit) from continuing operations to the amount computed by applying the statutory federal income tax rate to the net income (loss) from
continuing operations is summarized as follows (in thousands):

Tax at federal statutory rate
State, net of federal benefit
FDII
Rate change for changes in federal, foreign or state law
Change in uncertain tax positions
Sale of Vernalis R&D
Contingent liabilities
Foreign tax differential on income/loss of foreign subsidiaries
Research and development credits
Debt repurchases
Subpart F income
Share-based compensation
Provision to return adjustments
Officer compensation
Change in valuation allowance
Other

2022

Year Ended December 31,
2021

2020

7,562  $
264 
(2,395)
(535)
(158)
— 
15 
103 
256 
626 
853 
1,279 
2,232 
5,869 
24,799 
460 
41,230  $

15,163  $
(82)
(637)
(7,963)
480 
— 
(7,993)
(114)
(1,628)
— 
1,392 
(12,080)
(1,347)
3,239 
11,245 
(3,823)
(4,148) $

272 
(1,231)
(1,652)
(164)
(673)
127,372 
(266)
(3,839)
(168)
— 
25 
(623)
(5,920)
2,410 
(121,864)
1,015 
(5,306)

$

$

We remeasured certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%. Significant components of our
deferred tax assets and liabilities as of December 31, 2022 and 2021 are shown below. We assess the positive and negative evidence to determine if sufficient future taxable income
will be generated to use the existing deferred tax assets. Our evaluation of evidence resulted in management concluding that the majority of our deferred tax assets will be realized.
However, we maintain a valuation allowance to offset certain net deferred tax assets as management believes realization of such assets are uncertain as of December 31, 2022, 2021
and 2020. The valuation allowance increased $21.5 million in 2022, increased $11.4 million in 2021 and decreased $116.5 million in 2020.

We offset all deferred tax assets and liabilities by jurisdiction, as well as any related valuation allowance, and present them on our consolidated balance sheet as a non-current
deferred income tax asset or liability (as applicable). Deferred tax assets

84

 
 
 
 
 
(liabilities) are comprised of the following:

Deferred tax assets:

Net operating loss carryforwards
Research credit carryforwards
Stock compensation
Other

Valuation allowance for deferred tax assets
Net deferred tax assets

Deferred tax liabilities:
Identified intangibles

     Other
Net deferred tax liabilities

Deferred income taxes, net

December 31,

2022

2021

(in thousands)

53,960  $
26,309 
11,158 
19,542 
110,969 
(57,472)
53,497  $

(64,696)
(10,886)
(75,582) $

63,471 
26,908 
9,743 
12,989 
113,111 
(35,931)
77,180 

(66,848)
(5,459)
(72,307)

(22,085) $

4,873 

$

$

$

$

Beginning in 2022, the Tax Cuts and Jobs Act of 2017 requires taxpayers to capitalize and amortize R&D expenditures over five years for domestic research and 15 years for foreign
research pursuant to Section 174 of the Internal Revenue Code of 1986, as amended. We recorded an increase of $4.7 million to our current federal income tax expense and deferred
tax assets for continuing operations during 2022 due to the capitalization of R&D under Section 174.

As of December 31, 2022, we had federal net operating loss carryforwards set to expire through 2037 of $81.1 million and $168.3 million of state net operating loss carryforwards that
begin to expire in 2028. We also have $8.5 million of federal research and development credit carryforwards, which expire through 2040. We have $29.0 million of California
research and development credit carryforwards that have no expiration date. In addition, we have approximately $96.1 million of non-U.S. net operating loss carryovers and
approximately $15.6 million of non-U.S. capital loss carryovers that have no expiration date.

At December 31, 2021 we had federal net operating loss carryforwards set to expire through 2037 of $117.5 million and $170.1 million of state net operating loss carryforwards that
begin to expire in 2028. We also had $9.3 million in federal research and development credit carryforwards, which expire through 2040, and $29.0 million of California research and
development credit carryforwards that have no expiration date. In addition, we had approximately $101.6 million of non-U.S. capital loss carryovers and approximately $17.5 million
of non-U.S. capital loss carryovers that have no expiration date.

Pursuant to Section 382 and 383 of the Internal Revenue Code of 1986, as amended, utilization of our net operating losses and credits may be subject to annual limitations in the event
of any significant future changes in its ownership structure. These annual limitations may result in the expiration of net operating losses and credits prior to utilization. The deferred
tax assets as of December 31, 2022 are net of any previous limitations due to Section 382 and 383.

We account for income taxes by evaluating a probability threshold that a tax position must meet before a financial statement benefit is recognized. The minimum threshold is a tax
position that is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any related appeals or litigation processes, based on
the technical merits of the position. Our remaining liabilities for uncertain tax positions are presented net of the deferred tax asset balances on the accompanying consolidated balance
sheet.

A reconciliation of the amount of unrecognized tax benefits at December 31, 2022, 2021 and 2020 is as follows (in thousands):

Balance at beginning of year

     Additions based on tax positions related to the current year
     Additions for tax positions of prior years
     Reductions for tax positions of prior years

Balance at end of year

2022

December 31,
2021

2020

$

$

29,550  $
58 
— 
(512)
29,096  $

31,619  $
252 
751 
(3,072)
29,550  $

28,647 
3,911 
15 
(954)
31,619 

85

 
 
 
Included in the balance of unrecognized tax benefits at December 31, 2022 is $27.3 million of tax benefits that, if recognized would impact the effective rate. There are no positions
for which it is reasonably possible that the uncertain tax benefit will significantly increase or decrease within twelve months.

We recognize interest and penalties related to uncertain tax positions in income tax expense. As of December 31, 2022 and December 31, 2021, we recognized an immaterial amount
of interest and penalties. We file income tax returns in the United States, various state jurisdictions, United Kingdom, and Canada with varying statutes of limitations. The federal
statute of limitation remains open for the 2019 tax year to the present. The state income tax returns generally remain open for the 2018 tax year through the present. Net operating loss
and research credit carryforwards arising prior to these years are also open to examination if and when utilized. The Ligand California tax returns for 2019 and 2020 are currently
under audit. We believe our reserve for unrecognized tax benefits and contingent tax issues is adequate with respect to all open years.

86

12. Selected Quarterly Financial Data (Unaudited)

The following table contains quarterly financial information for 2022 and 2021. The Company believes that the following information reflects all normal recurring adjustments
necessary for a fair presentation of the information for the periods presented. The operating results for any quarter are not necessarily indicative of results for any future period.

March 31, 2022

June 30, 2022

Three months ended,
September 30,
2022
(in thousands, except per share data)
(unaudited)

December 31,
2022

36,516  $
9,179  $
11,925  $
34,383  $
(12,929) $
(2,456) $
(15,385) $
(0.77) $
(0.15) $
(0.77) $
(0.15) $

16,824 
16,824 

50,126  $
8,467  $
12,086  $
41,464  $
12,599  $
(13,494) $
(895) $
0.75  $
(0.80) $
0.74  $
(0.79) $

16,868 
17,058 

59,221  $
9,239  $
14,920  $
46,880  $
9,645  $
(9,241) $
404  $
0.57  $
(0.55) $
0.56  $
(0.54) $

16,888 
17,132 

50,382  $
9,197  $
31,131  $
70,481  $
(14,534) $
(2,951) $
(17,485) $
(0.86) $
(0.17) $
(0.86) $
(0.17) $

16,890 
16,890 

March 31, 2021

June 30, 2021

Three months ended,
September 30,
2021
(in thousands, except per share data)
(unaudited)

December 31,
2021

46,592  $
9,046  $
10,815  $
36,875  $
22,767  $
(4,660) $
18,107  $
1.39  $
(0.28) $
1.32  $
(0.27) $

16,435 
17,248 

78,854  $
7,482  $
12,412  $
24,941  $
36,442  $
(5,717) $
30,725  $
2.19  $
(0.34) $
2.12  $
(0.33) $

16,659 
17,172 

59,694  $
7,430  $
10,967  $
34,597  $
20,338  $
(6,615) $
13,723  $
1.22  $
(0.40) $
1.19  $
(0.39) $

16,688 
17,142 

56,404  $
8,147  $
12,596  $
41,280  $
(3,194) $
(2,223) $
(5,417) $
(0.19) $
(0.13) $
(0.19) $
(0.13) $

16,733 
16,733 

Total

196,245 
36,082 
70,062 
193,208 
(5,219)
(28,142)
(33,361)
(0.31)
(1.67)
(0.31)
(1.67)
16,868 
16,868 

Total

241,544 
32,105 
46,790 
137,693 
76,353 
(19,215)
57,138 
4.59 
(1.16)
4.43 
(1.11)
16,630 
17,246 

Total revenues
Research and development
General and administrative
Total operating costs and expenses
Net income (loss) from continuing operations
Net loss from discontinued operations
Net income (loss)
Basic net income (loss) from continuing operations per share
Basic net loss from discontinued operations per share
Diluted net income (loss) from continuing operations per share
Diluted net loss from discontinued operations per share
Shares used in the computation of basic net income (loss) per share
Shares used in the computation of diluted net income (loss) per share

Total revenues
Research and development
General and administrative
Total operating costs and expenses
Net income (loss) from continuing operations
Net loss from discontinued operations
Net income (loss)
Basic net income (loss) from continuing operations per share
Basic net loss from discontinued operations per share
Diluted net income (loss) from continuing operations per share
Diluted net loss from discontinued operations per share
Shares used in the computation of basic net income (loss) per share
Shares used in the computation of diluted net income (loss) per share

$
$
$
$
$
$
$
$
$
$
$

$
$
$
$
$
$
$
$
$
$
$

87

Item 9.

Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A.

Controls and Procedures

(a) Evaluation of Disclosure Controls and Procedures

We are responsible for maintaining disclosure controls and procedures designed to provide reasonable assurance that information required to be disclosed in reports we file

under the Exchange Act is recorded, processed, summarized and reported within the specified time periods and accumulated and communicated to management, including our Chief
Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure. The design of any system of controls is based in part upon
certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions;
over time, controls may become inadequate because of changes in conditions, or the degree of compliance with policies or procedures may deteriorate. Because of the inherent
limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected. As of the end of the period covered by this Annual Report on Form
10-K, we have carried out an evaluation, under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of
the effectiveness of our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, and have concluded our disclosure controls and
procedures were effective at a reasonable assurance level as of December 31, 2022.

There have been no changes in our internal control over financial reporting that occurred during the quarter ended December 31, 2022 that have materially affected, or are

reasonably likely to materially affect, our internal control over financial reporting.

(b) Management’s Report on Internal Control Over Financial Reporting

Management is responsible for establishing and maintaining adequate internal control over financial reporting for the Company. Internal control over financial reporting is a

process to provide reasonable assurance regarding the reliability of our financial reporting for external purposes in accordance with accounting principles generally accepted in the
United States of America. Internal control over financial reporting includes maintaining records that in reasonable detail accurately and fairly reflect our transactions; providing
reasonable assurance that transactions are recorded as necessary for preparation of our financial statements in accordance with generally accepted accounting principles; providing
reasonable assurance that receipts and expenditures are made in accordance with our management and directors; and providing reasonable assurance that
unauthorized acquisition, use or disposition of company assets that could have a material effect on our financial statements would be prevented or detected on a timely basis. Because
of its inherent limitations, internal control over financial reporting is not intended to provide absolute assurance that a misstatement of our financial statements would be prevented or
detected.

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the

effectiveness of our internal control over financial reporting based on the framework established by the Committee of Sponsoring Organizations of the Treadway Commission
(COSO) as set forth in the 2013 Internal Control-Integrated Framework. Based on our evaluation under the 2013 framework in Internal Control - Integrated Framework, management
concluded that our internal controls over financial reporting were effective as of December 31, 2022.

Ernst & Young LLP, an independent registered public accounting firm, has audited the Company’s consolidated financial statements included in this Annual Report on

Form 10-K and has issued an attestation report, included herein, on the effectiveness of our internal control over financial reporting as of December 31, 2022.

88

 
Report of Independent Registered Public Accounting Firm

The Stockholders and Board of Directors of Ligand Pharmaceuticals Incorporated

Opinion on Internal Control Over Financial Reporting

We have audited Ligand Pharmaceuticals Incorporated’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, Ligand Pharmaceuticals
Incorporated (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, comprehensive income (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 February 28, 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 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

San Diego, California
February 28, 2023

89

Item 9B.

Other Information

None

90

Item 9C.

Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

None

91

Item 10.

Directors, Executive Officers and Corporate Governance

Code of Conduct

Part III

The Board of Directors has adopted a Code of Conduct and Ethics Policy (“Code of Conduct”) that applies to all officers, directors and employees. The Company will promptly
disclose (1) the nature of any amendment to the Code of Conduct that applies to our principal executive officer, principal financial officer, principal accounting officer or controller or
persons performing similar functions and (2) the nature of any waiver, including an implicit waiver, from a provision of our Code of Conduct that is granted to one of these specified
officers, the name of such person who is granted the waiver and the date of the waiver on our website in the future. The Code of Conduct can be accessed via our website
(http://www.ligand.com), Corporate Overview page. You may also request a free copy by writing to: Investor Relations, Ligand Pharmaceuticals Incorporated, 3911 Sorrento Valley
Boulevard, Suite 110, San Diego, CA 92121.

The other information under Item 10 is hereby incorporated by reference to Ligand’s Definitive Proxy Statement to be filed with the SEC within 120 days of December 31,

2022. 

Item 11.

Executive Compensation

Item 11 is hereby incorporated by reference to Ligand’s Definitive Proxy Statement to be filed with the SEC within 120 days of December 31, 2022.

Item 12.

Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

Item 12 is hereby incorporated by reference to Ligand’s Definitive Proxy Statement to be filed with the SEC within 120 days of December 31, 2022.

Item 13.

Certain Relationships and Related Transactions, and Director Independence

Item 13 is hereby incorporated by reference to Ligand’s Definitive Proxy Statement to be filed with the SEC within 120 days of December 31, 2022.

Item 14.

Principal Accountant Fees and Services

Item 14 is hereby incorporated by reference to Ligand’s Definitive Proxy Statement to be filed with the SEC within 120 days of December 31, 2022.

92

 
 
 
 
 
Item 15.

Exhibits and Financial Statement Schedule

(a) The following documents are included as part of this Annual Report on Form 10-K.

PART IV

(1) Financial statements
Index to Consolidated Financial Statements
Report of Independent Registered Public Accounting Firm
Consolidated Balance Sheets
Consolidated Statements of Operations
Consolidated Statements of Comprehensive Income (Loss)
Consolidated Statements of Stockholders’ Equity
Consolidated Statements of Cash Flows
Notes to Consolidated Financial Statements

47
48
50
50
51
53
53
55

(2) Schedules not included herein have been omitted because they are not applicable or the required information is in the consolidated financial statements or notes thereto.

(3) The following exhibits are filed as part of this Form 10-K and this list includes the Exhibit Index.

Exhibit
Number

2.1

2.2

2.3*

2.4*

2.5*

3.1

3.2

3.3

3.4

3.5
3.6

Form

8-K

8-K

8-K

Description of Exhibit
Asset Purchase Agreement, dated March 5, 2019, by and among
Ligand Pharmaceuticals Incorporated and RPI Financial Trust
Agreement and Plan of Merger, dated as of August 10, 2020, by
and among Pfenex Inc., Ligand Pharmaceuticals Incorporated
and Pelican Acquisition Sub, Inc.
Agreement for the Sale and Purchase of the Entire Issued Share
Capital of Vernalis (R&D) Limited, dated as of October 11, 2020,
by and among Ligand Pharmaceuticals Incorporated, Vernalis
Limited, HitGen UK Ltd and HitGen Inc.
Agreement and Plan of Merger, dated as of March, 23, 2022, by
and among Avista Public Acquisition Corp. II, Ligand
Pharmaceuticals Incorporated, OmniAb, Inc. and Orwell Merger
Sub Inc.
Separation and Distribution Agreement, dated as of March 23,
2022, by and among Avista Public Acquisition Corp. II, Ligand
Pharmaceuticals Incorporated and OmniAb, Inc.
Amended and Restated Certificate of Incorporation of the
Company.
Certificate of Amendment of the Amended and Restated
Certificate of Incorporation of the Company, dated June 14, 2000 10-K
Certificate of Amendment of the Amended and Restated
Certificate of Incorporation of the Company, dated June 30, 2004 10-Q
Certificate of Amendment of the Amended and Restated
Certificate of Incorporation of the Company, dated November 17,
2010
Certificate of Amendment of the Amended and Restated
Certification of Incorporation of the Company, dated June 19,
2018
Fourth Amended and Restated Bylaws of the Company

S-8
8-K

8-K

8-K

8-K

S-4

Incorporated by Reference

File Number

Date of Filing

001-33093

March 5, 2019

001-33093

August 11, 2020

001-33093

October 13, 2020

001-33093

March 24, 2022

001-33093

March 24, 2022

333-58823

July 9, 1998

0-20720

0-20720

March 29, 2001

August 5, 2004

001-33093

November 19, 2010

333-233130
001-33093

August 8, 2019
October 30, 2020

93

Exhibit
Number

Filed
Herewith

2.1

2.1

2.1

2.1

2.2

3.1

3.5

3.6

3.1

3.6
3.1

 
 
 
4.1

4.2
4.3

10.1#

10.2#

10.3#

10.4#

10.5#

10.6#
10.7#
10.8#

10.9#
10.10#*

10.11#*

10.12#*

10.13#*

10.14#*

10.15#**

10.16

10.17*

DEF 14A

S-1

DEF

10-K

10-K

10-K

8-K
10-K

Specimen stock certificate for shares of the common stock of the
Company
Indenture, dated as of May 22, 2018, between the Company and
Wilmington Trust, National Association, as trustee, including the
form of 0.75% Convertible Senior Notes due 2023
Description of Registered Securities
2002 Stock Incentive Plan (as amended and restated effective June
10, 2022)
2002 Employee Stock Purchase Plan (as amended and restated
effective June 6, 2019)
Form of Stock Option Grant Notice and Stock Option Agreement
under the Company’s 2002 Stock Incentive Plan
Form of Stock Issuance Agreement for non-employee directors under
the Company’s 2002 Stock Incentive Plan
Form of Restricted Stock Unit Grant Notice and Restricted Stock
Unit Agreement under the Company’s 2002 Stock Incentive Plan
Form of Restricted Stock Unit Grant Notice and Restricted Stock
Unit Agreement under the Company’s 2002 Stock Incentive Plan -
Performance-Based RSU Form
10-K
Form of Executive Officer Change in Control Severance Agreement 8-K
Amended and Restated Severance Plan, effective November 1, 2022
Director Compensation and Stock Ownership Policy, as amended and
restated, effective April 13, 2020
2022 Employment Inducement Plan
Form of Stock Option Agreement under the Company’s 2022
Employment Inducement Plan
Form of Restricted Stock Unit Award Agreement under the
Company’s 2022 Employment Inducement Plan
Form of Performance-Based Restricted Stock Unit Award Agreement
under the Company’s 2022 Employment Inducement Plan
Separation Agreement , effective December 12, 2022, by and
between Ligand Pharmaceuticals Incorporated and John Higgins
Severance Agreement, effective December 5, 2022, by and between
Ligand Pharmaceuticals Incorporated and Todd C. Davis
Tax Matters Agreement, dated as of November 1, 2022, by and
among OmniAb, Inc.(f/k/a Avista Public Acquisition Corp. II)
Ligand Pharmaceuticals Incorporated and OmniAb Operations, Inc.
(f/k/a OmniAb, Inc.)
Amended and Restated Employee Matters Agreement, dated as of
August 18, 2022, by and among Ligand Pharmaceuticals
Incorporated, OmniAb Operations, Inc. (f/k/a OmniAb, Inc.),
OmniAb, Inc. (f/k/a Avista Public Acquisition Corp. II) and Orwell
Merger Sub Inc.

10-Q

10-Q

10-Q

10-Q

10-Q

8-K

001-33093

March 1, 2018

001-33093
001-33093

May 22, 2018
February 24, 2021

001-33093

April 22, 2022

001-33093

April 24, 2019

001-33093

February 24, 2014

333-131029

January 13, 2006

001-33093

March 1, 2018

001-33093
001-33093

March 1, 2018
August 22, 2007

001-33093

August 9, 2022

001-33093

August 9, 2022

001-33093

August 9, 2022

001-33093

August 9, 2022

4.1

4.1
4.3

Appendix A

Appendix B

10.5

10.289

10.6

10.7
10.1

10.2

10.3

10.4

10.5

001-33093

November 4, 2022

10.1

001-33093

November 8, 2022

10.1

X

X

X

X

94

10.18

10.19

10.20

10.21

10.22

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†

TR Beta Contingent Value Rights Agreement, dated January 27, 2010,
among the Company, Metabasis Therapeutics, Inc., David F. Hale and
Mellon Investor Services LLC
General Contingent Value Rights Agreement, dated January 27, 2010,
among the Company, Metabasis Therapeutics, Inc., David F. Hale and
Mellon Investor Services LLC
Amendment of General Contingent Value Rights Agreement, dated
January 26, 2011, among the Company, Metabasis Therapeutics, Inc.,
David F. Hale and Mellon Investor Services LLC
Amendment of General Contingent Value Rights Agreement dated May
20, 2014 among the Company, Metabasis Therapeutics, Inc., David F.
Hale and Computershare Inc.
Amendment of TR Beta Contingent Value Rights Agreement dated May
20, 2014 among the Company, Metabasis Therapeutics, Inc., David F.
Hale and Computershare, Inc.
Captisol® Supply Agreement, dated December 20, 2002, among CyDex,
Inc., Hovione LLC, Hovione FarmaCiencia S.A., Hovione
Pharmascience Limited and Hovione International Limited
1st Amendment to Captisol® Supply Agreement, dated July 29, 2005,
among CyDex, Inc., Hovione LLC, Hovione FarmaCiencia S.A.,
Hovione Pharmascience Limited and Hovione International Limited
2nd Amendment to Captisol® Supply Agreement, dated March 1, 2007,
among CyDex, Inc., Hovione LLC, Hovione FarmaCiencia S.A.,
Hovione Pharmascience Limited, and Hovione International Limited
3rd Amendment to Captisol® Supply Agreement, dated January 25,
2008, among CyDex, Inc., Hovione LLC, Hovione FarmaCiencia S.A.,
Hovione Pharmascience Limited, and Hovione International Limited
4th Amendment to Captisol® Supply Agreement, dated September 28,
2009, among CyDex Pharmaceuticals, Inc., Hovione LLC, Hovione
FarmaCiencia S.A., Hovione Pharmascience Limited and Hovione
International Limited
License Agreement, dated September 3, 1993, between CyDex L.C. and
The University of Kansas
First Amendment to License Agreement, dated February 24, 1998,
between CyDex, Inc. and The University of Kansas
Second Amendment to License Agreement, dated August 4, 2004,
between CyDex, Inc. and The University of Kansas
Acknowledgement Agreement, dated February 22, 2008, between
CyDex, Inc. and The University of Kansas
Exclusive License Agreement, dated June 4, 1996, between Pfizer, Inc.
and The University of Kansas
Addendum to Nonexclusive License Agreement, dated December 11,
2001, between CyDex, Inc. and Pfizer, Inc.
License Agreement, by and between CyDex Pharmaceuticals, Inc. and
Spectrum Pharmaceuticals, Inc., dated as of March 8, 2013
Supply Agreement, by and between CyDex Pharmaceuticals, Inc. and
Spectrum Pharmaceuticals, Inc., dated as of March 8, 2013

8-K

8-K

8-K

8-K

8-K

001-33093

January 28, 2010

001-33093

January 28, 2010

001-33093

January 31, 2011

001-33093

May 22, 2014

001-33093

May 22, 2014

10-K

001-33093

March 3, 2011

10-K

001-33093

March 3, 2011

10-K

001-33093

March 3, 2011

10-K

001-33093

March 3, 2011

001-33093

March 3, 2011

001-33093

March 3, 2011

001-33093

March 3, 2011

001-33093

March 3, 2011

001-33093

March 3, 2011

001-33093

March 3, 2011

001-33093

March 3, 2011

001-33093

May 8, 2013

001-33093

May 8, 2013

10-K

10-K

10-K

10-K

10-K

10-K

10-K

10-Q

10-Q

95

10.2

10.4

10.1

10.1

10.2

10.1

10.101

10.102

10.103

10.104

10.105

10.106

10.107

10.111

10.108

10.11

10.2

10.3

10.36†

10.37†

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

10.53

Royalty Stream and Milestone Payments Purchase Agreement, dated
April 29, 2013, between the Company and Selexis S.A.
Master License Agreement dated May 21, 2014 among the Company,
Metabasis Therapeutics, Inc. and Viking Therapeutics, Inc.
First Amendment to Master License Agreement dated September 6,
2014 among the Company, Metabasis Therapeutics, Inc. and Viking
Therapeutics, Inc.
Second Amendment to Master License Agreement, dated April 8, 2015,
among the Company, Metabasis Therapeutics, Inc. and Viking
Therapeutics, Inc.
Letter Agreement, dated as of August 12, 2014, between Bank of
America, N.A. and the Company regarding the Base Issuer Warrant
Transaction
Letter Agreement, dated as of August 12, 2014, between Deutsche
Bank AG, London Branch and the Company regarding the Base Issuer
Warrant Transaction
Letter Agreement, dated as of August 14, 2014, between Bank of
America, N.A. and the Company regarding the Additional Issuer
Warrant Transaction
Letter Agreement, dated as of August 14, 2014, between Deutsche
Bank AG, London Branch and the Company regarding the Additional
Issuer Warrant Transaction
Development Funding and Royalties Agreement, dated December 13,
2018, by and between Ligand Pharmaceuticals Incorporated and
Palvella Therapeutics, Inc.
Sublicense Agreement between the Company, Pharmacopeia, Inc. and
Retrophin LLC dated as of February 16, 2012, as amended through
Amendment No. 5 to Sublicense Agreement, dated March 20, 2018.
Interest Purchase Agreement, dated May 3, 2016, between the
Company and CorMatrix Cardiovascular, Inc.
Amended and Restated Interest Purchase Agreement, dated May 31,
2017, between the Company and CorMatrix Cardiovascular, Inc.
Letter Agreement, dated as of May 17, 2018, between Barclays Capital
Inc. and the Company regarding the Base Convertible Note Hedge
Transaction
Letter Agreement, dated as of May 17, 2018, between Barclays Capital
Inc. and the Company regarding the Base Issuer Warrant Transaction
Letter Agreement, dated as of May 17, 2018, between Deutsche Bank
AG and the Company regarding the Base Convertible Note Hedge
Transaction
Letter Agreement, dated as of May 17, 2018, between Deutsche Bank
AG and the Company regarding the Base Issuer Warrant Transaction
Letter Agreement, dated as of May 17, 2018, between Goldman Sachs
& Co. LLC and the Company regarding the Base Convertible Note
Hedge Transaction
Letter Agreement, dated as of May 17, 2018, between Goldman Sachs
& Co. LLC and the Company regarding the Base Issuer Warrant
Transaction

10-Q

10-Q

001-33093

August 1, 2013

001-33093

August 5, 2014

10-Q

001-33093

October 31, 2014

10-Q

001-33093

August 5, 2015

8-K

8-K

8-K

8-K

001-33093

August 18, 2014

001-33093

August 18, 2014

001-33093

August 18, 2014

001-33093

August 18, 2014

10-K

001-33093

February 28, 2019

10-K

001-33093

February 28, 2022

8-K/A

001-33093

May 9, 2016

10-Q

001-033093

August 9, 2017

001-00393

May 22, 2018

001-00393

May 22, 2018

001-00393

May 22, 2018

001-00393

May 22, 2018

001-00393

May 22, 2018

001-00393

May 22, 2018

8-K

8-K

8-K

8-K

8-K

8-K

96

10.2

10.2

10.9

10.1

10.2

10.4

10.6

10.8

10.48

10.37

10.1

10.2

10.1

10.2

10.3

10.4

10.5

10.6

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

10.68

10.69

10.70
21.1
23.1

8-K

8-K

8-K

8-K

8-K

8-K

10-K

Letter Agreement, dated as of May 18, 2018, between Barclays Capital
Inc. and the Company regarding the Additional Convertible Note Hedge
Transaction
Letter Agreement, dated as of May 18, 2018, between Barclays Capital
Inc. and the Company regarding the Additional Warrant Transaction
Letter Agreement, dated as of May 18, 2018, between Deutsche Bank
AG and the Company regarding the Additional Convertible Note Hedge
Transaction
Letter Agreement, dated as of May 18, 2018, between Deutsche Bank
AG and the Company regarding the Additional Warrant Transaction
Letter Agreement, dated as of May 18, 2018, between Goldman Sachs
& Co. LLC and the Company regarding the Additional Convertible
Note Hedge Transaction
Letter Agreement, dated as of May 18, 2018, between Goldman Sachs
& Co. LLC and the Company regarding the Additional Warrant
Transaction
Form of Indemnification Agreement between the Company and each of
its directors
Form of Indemnification Agreement between the Company and each of
its officers
Addendum, dated May 22, 2019, by and among Ligand Pharmaceuticals
Incorporated, CyDex Pharmaceuticals, Inc., and Acrotech Biopharma
LLC (as successor-in-interest to Spectrum Pharmaceuticals, Inc.), to that
certain License Agreement between Ligand Pharmaceuticals
Incorporated and Spectrum Pharmaceuticals, Inc., dated March 8, 2013 10-Q
Call Option Amendment Agreement, dated April 6, 2020, between the
Registrant and Barclays Bank PLC
Call Option Amendment Agreement, dated April 6, 2020, between the
Registrant and Deutsche Bank AG, London Branch
Call Option Amendment Agreement, dated April 6, 2020, between the
Registrant and Goldman Sachs & Co. LLC
Call Option Amendment Agreement, dated January 28, 2021, between
the Registrant and Barclays Bank PLC
Call Option Amendment Agreement, dated January 28, 2021, between
the Registrant and Deutsche Bank AG, London Branch
Call Option Amendment Agreement, dated January 28, 2021, between
the Registrant and Goldman Sachs & Co. LLC
Supply agreement, dated December 22, 2015, by and between Cydex
Pharmaceuticals, Inc. and Gilead Sciences, Inc.
Amendment to Supply Agreement, dated September 21, 2020, by and
between Cydex Pharmaceuticals, Inc. and Gilead Sciences, Inc., which
amends that certain Supply Agreement, dated December 2, 2015, by and
between Cydex Pharmaceuticals, Inc. and Gilead Sciences, Inc.
Subsidiaries of the Company
Consent of Independent Registered Public Accounting Firm

10-Q

10-K

10-Q

10-K

10-Q

10-K

10-K

10-K

10-Q

97

001-00393

May 22, 2018

001-00393

May 22, 2018

001-00393

May 22, 2018

001-00393

May 22, 2018

001-00393

May 22, 2018

001-00393

May 22, 2018

001-33093

March 1, 2018

001-33093

March 1, 2018

001-33093

August 8, 2019

001-33093

May 8, 2020

001-33093

May 8, 2020

001-33093

May 8, 2020

001-33093

February 24, 2021

001-33093

February 24, 2021

001-33093

February 24, 2021

001-33093

February 24, 2021

10.7

10.8

10.9

10.10

10.11

10.12

10.60

10.61

10.1

10.1

10.2

10.3

10.67

10.68

10.69

10.72

001-33093

November 6, 2020

10.2

X
X

31.1

31.2

32.1

101

104

Certification by Principal Executive Officer, Pursuant to Rules 13a-14(a)
and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley
Act of 2002.
Certification by Principal Financial Officer, Pursuant to Rules 13a-14(a) and
15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of
2002.
Certifications by Principal Executive Officer and Principal Financial
Officer, Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section
906 of the Sarbanes-Oxley Act of 2002.
The following financial information from our Annual Report on Form 10-
K for the fiscal year ended December 31, 2022, formatted in iXBRL
(inline eXtensible Business Reporting Language): (i) Consolidated Balance
Sheets, (ii) Consolidated Statements of Operations, (iii) Consolidated
Statement of Comprehensive Income, (iv) Consolidated Statements of
Stockholders' Equity, (v) Consolidated Statements of Cash Flows, and (vi)
the Notes to Consolidated Financial Statements.
The cover page from the Company's Annual Report on Form 10-K for the
fiscal year ended December 31, 2022, formatted in Inline XBRL and
contained in Exhibit 101.

X

X

X

X

X

†    Confidential treatment has been requested for portions of this exhibit. These portions have been omitted and submitted separately to the Securities and Exchange Commission.
#    Indicates management contract or compensatory plan.
*    Certain schedules and annexes have been omitted in accordance with Item 601(a)(5) of Regulation S-K. A copy of any omitted schedule and/or annex will be furnished as a supplement to the U.S.

Securities and Exchange Commission upon request.

**    Pursuant to Item 601(b)(10) of Regulation S-K, certain confidential portions of this exhibit were omitted by means of marking such portions with an asterisk because the identified confidential

portions (i) are not material and (ii) would be competitively harmful if publicly disclosed.

Item 16.

None

Form 10-K Summary

98

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

LIGAND PHARMACEUTICALS INCORPORATED

By:

/S/    TODD C. DAVIS        
Todd C. Davis,
Chief Executive Officer

Date: February 28, 2023

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities

and on the dates indicated.

Signature

/s/    TODD C. DAVIS

Todd C. Davis

/s/    OCTAVIO ESPINOZA
Octavio Espinoza

/s/    JOHN W. KOZARICH

John W. Kozarich

/s/    JASON M. ARYEH

Jason M. Aryeh

/s/    NANCY R. GRAY

Nancy R. Gray

/s/    JASON HAAS
Jason Haas

/s/    JOHN L. LAMATTINA

John L. LaMattina

/s/    STEPHEN L. SABBA

Stephen L. Sabba

Chief Executive Officer and Director (Principal Executive Officer)

February 28, 2023

Title

Date

Chief Financial Officer (Principal Financial and Accounting Officer)

February 28, 2023

Director and Chairman of the Board

February 28, 2023

Director

Director

Director

Director

Director

99

February 28, 2023

February 28, 2023

February 28, 2023

February 28, 2023

February 28, 2023

 
Exhibit 10.8

LIGAND PHARMACEUTICALS INCORPORATED
AMENDED AND RESTATED SEVERANCE PLAN
AND SUMMARY PLAN DESCRIPTION

Effective Date: November 1, 2022

1.

 Purpose. The purpose of this Ligand Pharmaceuticals Incorporated Amended and Restated Severance Plan (this “ Plan”) is to provide
certain Severance Payments and Benefits (as defined below) to designated employees of the Company in the event of a termination of their employment
in  certain  specified  circumstances.  This  Plan  is  an  “employee  welfare  benefit  plan,”  as  defined  in  Section  3(1)  of  ERISA.  This  Plan  is  governed  by
ERISA and, to the extent applicable, the laws of the State of California. This document constitutes both the written instrument under which this Plan is
maintained and the required summary plan description for this Plan.

2.

 Definitions. The following definitions are applicable for purposes of this Plan, in addition to terms defined in Section 1 above:

(a)

“Accrued Obligations” means, for an Eligible Employee, the Eligible Employee’s (i) base salary otherwise payable through the Date of
Termination, (ii) unreimbursed business expenses reimbursable under Company policies then in effect, and (iii) earned and accrued vacation pay and/or
paid time off, if applicable, to the extent not theretofore paid.

(b)

“Administrator” means the Company, whether or not acting through the Committee or another duly constituted committee of members

of the Board, or any person or persons to whom the Administrator has delegated any authority or responsibility with respect to this Plan.

(c)

“Affiliate” means with respect to a specified Person, a Person that directly, or indirectly through one or more intermediaries, controls, is

controlled by, or is under common control with, the specified Person.

(d)

“Base Salary” means (i) with respect to any Eligible Employee who is compensated on a salaried basis, the Eligible Employee’s annual
base salary as of the Date of Termination, and (ii) with respect to any Eligible Employee who is compensated on an hourly basis, the product of (x) the
Eligible Employee’s hourly wage rate as of the Date of Termination (determined without regard to overtime) and (y) the Eligible Employee’s annual
scheduled  hours  determined  on  the  Date  of  Termination. Base  Salary  will  not  include  any  bonus,  incentive  compensation,  benefits  or  expense
reimbursements or equity awards.

(e)

“Board” means the Board of Directors of the Company.

(f)

“Cause” means that, in the reasonable determination of the Company, an Eligible Employee: (i) has been convicted of (or entered a plea
of no contest to) any felony or any other criminal act; (ii) committed any act of fraud or embezzlement; (iii) permitted or allowed any unauthorized use or
disclosure of confidential or proprietary information or trade secrets of the Company  or  its  subsidiaries;  (iv)  committed  any  material  violation  of  the
Company’s policies; or (v) committed any other intentional misconduct which adversely affects the business or affairs of the Company in a material
manner.

(g)

“COBRA” means the continuation coverage requirements for “group health plans” under Title X of the Consolidated Omnibus Budget
Reconciliation Act of 1985, as amended, and as codified in Code Section 4980B and ERISA Sections 601 through 608, each as amended from time to
time, including rules thereunder and successor provisions and rules thereto.

(h)

“Code” means the Internal Revenue Code of 1986, as amended from time to time, and all regulations, interpretations, and administrative

guidance issued thereunder.

(i)

“Code Section 409A ” means Section 409A of the Code.

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(j)

“Committee” means the Human Capital Management and Compensation Committee of the Board, or its designee.

(k)

“Company” means Ligand Pharmaceuticals Incorporated, a Delaware corporation, including all of its Affiliates, collectively (and any
successors  or  assigns  thereto),  and  any  successor  that  assumes  the  obligations  of  the  Company  under  this  Plan,  by  way  of  merger,  acquisition,
consolidation or other transaction.

(l)

“Date of Termination” means, for an Eligible Employee, the date of the Eligible Employee’s Separation from Service.

(m)

“Distribution”  shall  mean  the  distribution  of  OmniAb’s  common  stock  then  owned  directly  by  the  Company  to  the  Company’s
stockholders in furtherance of the spin-off of OmniAb from the Company, as more fully described in that certain Separation and Distribution Agreement,
dated as of March 23, 2022, by and among the Company, OmniAb, Avista Public Acquisition Corp. II, and Orwell Merger Sub Inc., as amended from
time to time.

(n)

“Eligible Employee” means an employee of the Company or any Subsidiary who has been designated by the Administrator to participate
in  the  Plan  and  has  executed  and  delivered  such  Participation Agreement  to  the  Company;  provided,  that,  “Eligible Employee”  will  not  include  any
employees of OmniAb. An employee will be considered an Eligible Employee if he or she is on a Company-approved leave of absence immediately
prior to the Date of Termination and he or she was employed full-time immediately prior to the commencement of such leave. For the avoidance of
doubt, an employee will not be eligible for benefits under this Plan if he or she (a) is a party to any individual change in control severance agreement,
employment agreement or other arrangement providing severance benefits, in each case, as approved by the Board or the Committee in effect as of the
Date of Termination, (b) voluntarily terminates employment with the Company, (c) is discharged by the Company for Cause, or (d) declines an offer by
the Company or any successor to the Company (or any acquirer of any of the Company’s assets or product lines) made to him or her at the time of
termination of employment of a similar or better position in job content and base compensation, provided that the location of the offered position is not
more than 75 miles from his or her principal work location at the time of his or her termination of employment.

(o)

(p)

“Equity Plan” means an equity incentive plan maintained by the Company.

“ERISA” means the Employee Retirement Income Security Act of 1974, as amended.

(q)

“Merger” means the transactions contemplated by that certain Agreement and Plan of Merger, dated as of March 23, 2022, by and among

the Company, OmniAb, Avista Public Acquisition Corp. II, and Orwell Merger Sub Inc., as amended from time to time.

(r)

“OmniAb” means OmniAb, Inc., a Delaware corporation and Subsidiary of the Company.

(s)

“Participation Agreement” means the individual agreement (a form of which is shown in  Appendix A), which may be in an electronic
format, provided by the Administrator to an employee of the Company designating such employee as an Eligible Employee under the Plan, which has
been signed and accepted by the employee.

(t)

“Person” means an individual, corporation, partnership, limited liability company, association, trust, other entity, group or organization

include a governmental authority.

(u)

“Qualifying Termination”  means  a  termination  of  an  Eligible  Employee’s  employment  by  the  Company  without  Cause. Termination
due to death or disability shall not be treated as a Qualifying Termination. For the avoidance of doubt, neither (i) the transfer of an Eligible Employee’s
employment from the Company to OmniAb or any subsidiary of OmniAb, (ii) the consummation of the Distribution or the Merger or (iii) an Eligible
Employee’s objection to the transfer of employment from

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the Company to OmniAb and the subsequent termination of employment by the Company, shall, in each case, constitute a Qualifying Termination.

(v)

“Release” has the meaning specified in Section 6.

(w)

“Release Period” has the meaning specified in Section 6.

(x)

“Separation from Service” means a separation from service within the meaning of Code Section 409A.

(y)

“Severance Payments and Benefits” means all benefits provided or payments made by the Company to or for the benefit of an Eligible

Employee under this Plan as a result of a Qualifying Termination.

(z)
Date of Termination.

“Severance Period” will be equal to (a) two months plus (b) one week for each of the Eligible Employee’s Years of Service as of the

(aa)

“Stock Awards ” means all stock options, restricted stock, restricted stock units and such other awards granted pursuant to any Equity

Plan and any shares of stock issued upon exercise or settlement thereof.

(bb)

“Subsidiary” means any entity (other than the Company), whether domestic or foreign, in an unbroken chain of entities beginning with
the  Company  if  each  of  the  entities  other  than  the  last  entity  in  the  unbroken  chain  beneficially  owns,  at  the  time  of  the  determination,  securities  or
interests representing at least 50% of the total combined voting power of all classes of securities or interests in one of the other entities in such chain.

(cc)

“Year of Service” means each 12-month period of an Eligible Employee’s continuous and uninterrupted service with the Company or an
Affiliate (or, in the event of a partial year of service, to the extent an Eligible Employee provided continuous and uninterrupted service to the Company
or an Affiliate for at least six months and one day during such year, such year shall count as a full “Year of Service” for purposes of this Plan).

3.

  Eligibility. An  Eligible  Employee  shall  be  eligible  for  Severance  Payments  and  Benefits  under  this  Plan,  subject  to  the  terms  and
conditions described herein, only if he or she (a) experiences a Qualifying Termination, (b) is an Eligible Employee on his or her Date of Termination
and (c) is not subject to disciplinary action or on a formal performance improvement plan on his or her Date of Termination.

4.

 Administration . This Plan shall be interpreted, administered and operated by the Administrator, which shall have complete authority,
subject  to  the  express  provisions  of  this  Plan,  to  interpret  this  Plan,  to  prescribe,  amend  and  rescind  rules  and  regulations  relating  to  this  Plan,  to
determine eligibility for benefits under this Plan, and to make all other determinations necessary or advisable for the administration of this Plan. Such
authority shall include the powers to resolve ambiguities, inconsistencies, and omissions, and to amend the Plan to correct any scrivener’s error. The
Administrator  may  delegate  any  of  its  duties  hereunder  to  a  subcommittee,  or  to  such  person  or  persons  from  time  to  time  as  it  may  designate. All
decisions, interpretations and other actions of the Administrator shall be final, conclusive and binding on all parties who have an interest in this Plan.

5.

  Termination  of  Employment  for  any  Reason.  Subject  to  the  terms  and  conditions  hereof,  in  the  event  of  an  Eligible  Employee’s

termination of employment with the Company for any reason:

payable under the Company’s policies if the Eligible Employee’s employment had not terminated.

(a)

The Company shall pay the Eligible Employee the Accrued Obligations, payable on the dates such amounts would have been

conditions of the applicable Equity Plan(s) and award agreements evidencing such Stock Awards.

(b)

All outstanding Stock Awards held by the Eligible Employee as of the Date of Termination shall be governed by the terms and

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applicable provisions of such plans, in each case as in effect and amended from time to time.

(c)

The  Eligible  Employee’s  benefits  and  rights  under  the  Company’s  benefit  plans  shall  be  determined  in  accordance  with  the

6.

  Qualifying  Termination .  In  addition  to  the  payments  and  benefits  set  forth  in  Section  5,  if  an  Eligible  Employee’s  termination  of
employment with the Company is a Qualifying Termination, the Eligible Employee shall also be entitled to receive the following payments and benefits,
subject to the Eligible Employee timely executing a release of claims agreement in substantially the form attached as Appendix B-1  or B-2  hereto,  as
applicable (each, a “Release”), and such Release becoming effective, enforceable and irrevocable no later than sixty (60) days following the Eligible
Employee’s  Date  of  Termination  (such  period,  the  “ Release  Period”),  and  subject  to  the  Eligible  Employee’s  continued  compliance  with  Section  8
below:

the Severance Period, paid in a lump sum within ten (10) days following the effective date of the Eligible Employee’s Release; and

(a)

The Eligible Employee shall be entitled to receive severance pay in an amount equal to the Eligible Employee’s Base Salary for

(b)

If the Eligible Employee, and any spouse and/or dependents of the Eligible Employee has coverage on the Eligible Employee’s
Date  of  Termination  under  a  group  health  plan  sponsored  by  the  Company  and  timely  and  properly  elects  to  receive  continued  group  health  plan
coverage under COBRA, the Company will pay the portion of the premiums for such COBRA coverage (other than for coverage under a health flexible
spending account) that exceeds the contributions required by the Eligible Employee immediately prior to the Date of Termination (based on elections in
effect for the Eligible Employee and any spouse and/or dependents of the Eligible Employee, in each case, on the Date of Termination), for the period
beginning on the Date of Termination and ending on the earlier of the last day of the Severance Period and the date on which the Eligible Employee
becomes eligible to receive benefits under a “group health plan” (within the meaning of Section 4980B of the Code) of a subsequent employer of the
Eligible Employee. Notwithstanding the foregoing, in the event that the Company determines, in its sole discretion, that the Company cannot provide the
foregoing  benefits  in  a  manner  that  is  exempt  from  Section  409A  (as  defined  below)  or  that  is  otherwise  compliant  with  applicable  law  (including,
without limitation, Code Section 105(h) or Section 2716 of the Public Health Service Act), the Company shall instead pay to the Eligible Employee the
foregoing monthly amount as a taxable monthly payment for the foregoing COBRA coverage period (or any remaining portion thereof).  An Eligible
Employee shall be solely responsible for all matters relating to continuation of coverage pursuant to COBRA, including, without limitation, the election
of such coverage and the timely payment of premiums.

7.

 Other Provisions Applicable to Severance Payments and Benefits; Non-Duplication of Payments or Benefits.

shall not be considered a termination of employment for purposes of this Plan.

(a)

 Anything in this Plan to the contrary notwithstanding, a transfer of employment from the Company to an Affiliate or vice versa

(b)

An Eligible Employee shall not be entitled to any Severance Payment or Benefit under this Plan which duplicates a payment or
benefit received or receivable by the Eligible Employee under any employment or severance agreement, or any other plan, program or arrangement of
the  Company  or  any  severance  required  by  applicable  law  or  regulation, including,  without  limitation,  the  Worker Adjustment  and  Retraining
Notification Act (“WARN”) or any similar state or local statute, rule or regulation . If an Eligible Employee has a right to payments or benefits that
duplicate the Severance Payment or Benefit under this Plan, the benefit under this Plan shall be reduced, dollar for dollar, by the amount of the duplicate
payment(s) and benefit(s). The benefits provided under this Plan are intended to satisfy, in whole or in part, any and all statutory obligations that may
arise  out  of  an  Eligible  Employee’s  termination  of  employment,  and  the  Company  shall  so  construe  and  enforce  the  terms  of  this  Plan. The
Administrator’s decision to waive all or a portion of such reductions to the severance benefits of one employee and the amount of such reductions shall in
no way obligate the Administrator to waive the same reductions in the same amounts to the severance benefits of any other employees, even if similarly
situated. Such reductions may be applied on a retroactive basis, with

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severance benefits previously paid being recharacterized as payments pursuant to a statutory obligation of the Company.

8.

Restrictive  Covenants.  Each  Eligible  Employee  hereby  expressly  confirms  his  or  her  continuing  obligations  to  the  Company  and  its
Affiliates  pursuant  to  the  confidentiality  provisions  of  any  code  of  conduct  of  the  Company  or  its  Affiliates,  the  Company’s  standard  employee
confidentiality  and  inventions  agreement  and/or  other  agreements  regarding  non-competition,  non-solicitation,  non-disparagement,  confidentiality,
assignment of inventions or other similar covenants between such Eligible Employee and the Company (the “Restrictive Covenants”).

9.

Special  Rules  for  Compliance  with  Code  Section  409A.  This  Section  9  serves  to  ensure  compliance  with  applicable  requirements  of

Code Section 409A. If the terms of this Section 9 conflict with other terms of this Plan, the terms of this Section 9 shall control.

(a)

To  the  extent  applicable,  this  Plan  shall  be  interpreted  in  accordance  with  Code  Section  409A  and  Department  of  Treasury
regulations and other interpretive guidance issued thereunder. The intent of the parties is that payments and benefits under this Agreement comply with,
or be exempt from Code Section 409A and, accordingly, to the maximum extent permitted, this Agreement shall be interpreted to be in compliance with
such intention. To the extent that any provision in this Agreement is ambiguous as to its compliance with or exemption from Code Section 409A, the
provision shall be read in such a manner that no payments payable under this Agreement shall be subject to an “additional tax” as defined in Section
409A(a)(1)(B) of the Code.

Each  installment  in  a  series  of  Severance  Payments  and  Benefits  shall  be  deemed  a  separate  payment  for  purposes  of  Code
Section 409A. For purposes of this Plan, all references to an Eligible Employee’s “termination of employment” shall mean his or her Separation from
Service.

(b)

(c)

  If  an  Eligible  Employee  is  a  “specified  employee”  (as  determined  by  the Administrator  or  its  designee  in  accordance  with
Treasury Regulation § 1.409A-1(i)) as of his or her Date of Termination, then all Severance Payments and Benefits that are subject to the requirements
of Code Section 409A (determined after taking into account the “short-term deferral” rule in Treasury Regulation § 1.409A-1(b)(4), the “two-year, two-
time” rule described in Treasury Regulation § 1.409A-1(b)(9), and any other available exception from such requirements) shall be subject to the six-
month delay rule of Code Section 409A(a)(2)(B)(i). Each payment that is subject to such six-month delay rule shall be made, without interest, on the
later  of  (i)  the  Company’s  first  payroll  date  that  is  at  least  six  months  after  the  Eligible  Employee’s  Date  of  Termination  (or,  if  earlier,  as  soon  as
practicable after the Eligible Employee’s death) or (ii) the date when such payment would otherwise be due under the terms of the Plan.

To the extent that the payments or benefits under this Plan are “non-qualified deferred compensation” subject to Code Section
409A, if the Release Period spans two calendar years, the payment of any Severance Payments and Benefits shall occur (or commence) on the later of (i)
January 1 of the second calendar year, or (ii) the first regularly-scheduled payroll date following the date the Release becomes effective.

(d)

(e)

To the extent required by Code Section 409A, any reimbursement or in-kind benefit provided under this Plan shall be provided
in accordance with the following: (i) the amount of expenses eligible for reimbursement, or in-kind benefits provided during each calendar year cannot
affect the expenses eligible for reimbursement, or in-kind benefits to be provided, in any other calendar year; (ii) any payments in lieu of the benefits
shall be paid no later than the end of Eligible Employee’s taxable year next following Eligible Employee’s taxable year in which the benefit or expense
was due to be paid; and (iii) any right to reimbursements or in-kind benefits under this Plan shall not be subject to liquidation or exchange for another
benefit.

 The Company and its employees and agents make no representation and are providing no advice regarding the taxation of the
payments and benefits under this Plan, including with respect to taxes, interest and penalties under Code Section 409A and similar liabilities under state
and local tax laws. No indemnification or gross-up is payable under this Plan with respect to any such tax,

(f)

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interest, or penalty under Code Section 409A or similar liability under state or local tax laws applicable to any Eligible Employee.

10.

 Claims Procedures. Normally, an Eligible Employee does not need to present a formal claim to receive benefits payable under this Plan.
If any person (the “Claimant”) believes that benefits are being denied improperly, that this Plan is not being operated properly, that fiduciaries of this
Plan have breached their duties, or that the Claimant’s legal rights are being violated with respect to this Plan, the Claimant must file a formal claim, in
writing, with the Administrator. A formal claim must be filed within 60 days after the date the Claimant first knew or should have known of the facts on
which the claim is based, unless the Administrator in writing consents otherwise or the deadline to file a claim is temporarily extended under the rules
described in Appendix C.  The Administrator has adopted procedures for considering claims (which are set forth in Appendix C), which it may amend
from time to time, as it sees fit. These procedures shall comply with all applicable legal requirements, and the Administrator shall provide a Claimant, on
request, with a copy of such amended claims procedures. The right to receive benefits under this Plan is contingent on a Claimant using the prescribed
claims procedures to resolve any claim.

11.

Best Pay Provision.

        (a)        In  the  event  that  any  payment  or  benefit  received  or  to  be  received  by  the  Eligible  Employee  pursuant  to  the  terms  of  any  plan,
arrangement  or  agreement  (including  any  payment  or  benefit  received  in  connection  with  a  change  in  ownership  or  control  or  the  termination  of  the
Eligible Employee’s employment) (all such payments and benefits being hereinafter referred to as the “Total Payments”) would be subject (in whole or
part) to the excise tax (the “Excise Tax”) imposed under Section 4999 of the Code, then the Total Payments shall be reduced to the extent necessary so
that no portion of the Total Payments is subject to the Excise Tax but only if (A) the net amount of such Total Payments, as so reduced (after subtracting
the amount of federal, state and local income taxes on such reduced Total Payments and after taking into account the phase out of itemized deductions
and personal exemptions attributable to such reduced Total Payments) is greater than or equal to (B) the net amount of such Total Payments without such
reduction (after subtracting the net amount of federal, state and local income taxes on such Total Payments and the amount of Excise Tax to which the
Eligible Employee would be subject in respect of such unreduced Total Payments and after taking into account the phase out of itemized deductions and
personal exemptions attributable to such unreduced Total Payments). Except to the extent that an alternative reduction order would result in a greater
economic benefit to the Eligible Employee on an after-tax basis, the parties intend that the Total Payments shall be reduced in the following order: (w)
reduction of any cash severance payments otherwise payable to the Eligible Employee that are exempt from Section 409A of the Code, (x) reduction of
any  other  cash  payments  or  benefits  otherwise  payable  to  the  Eligible  Employee  that  are  exempt  from  Section  409A  of  the  Code,  but  excluding  any
payment  attributable  to  the  acceleration  of  vesting  or  payment  with  respect  to  any  equity  award  that  is  exempt  from  Section  409A  of  the  Code,  (y)
reduction of any other payments or benefits otherwise payable to the Eligible Employee on a pro-rata basis or such other manner that complies with
Section 409A of the Code, but excluding any payment attributable to the acceleration of vesting and payment with respect to any equity award that is
exempt from Section 409A of the Code, and (z) reduction of any payments attributable to the acceleration of vesting or payment with respect to any
equity award that is exempt from Section 409A of the Code; provided, in case of clauses (x), (y) and (z), that reduction of any payments or benefits
attributable to the acceleration of vesting of Company equity awards shall be first applied to equity awards with later vesting dates; provided, further,
that,  notwithstanding  the  foregoing,  any  such  reduction  shall  be  undertaken  in  a  manner  that  complies  with  and  does  not  result  in  the  imposition  of
additional  taxes  on  the  Eligible  Employee  under  Section  409A  of  the  Code. The  foregoing  reductions  shall  be  made  in  a  manner  that  results  in  the
maximum economic benefit to the Eligible Employee on an after-tax basis and, to the extent economically equivalent payments or benefits are subject to
reduction, in a pro rata manner.

(b)       All  determinations  regarding  the  application  of  this  Section  11  shall  be  made  by  an  independent  accounting  firm  or  consulting
group  with  nationally  recognized  standing  and  substantial  expertise  and  experience  in  performing  calculations  regarding  the  applicability  of  Section
280G of the Code and the Excise Tax retained by the Company prior to the date of the applicable change in ownership or control (the “280G Firm”). For
purposes of determining whether and the extent to which the Total

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Payments will be subject to the Excise Tax, (i) no portion of the Total Payments shall be taken into account which (x) does not constitute a “parachute
payment” within the meaning of Section 280G(b)(2) of the Code (including by reason of Section 280G(b)(4)(A) of the Code) and, in calculating the
Excise  Tax,  or  (y)  constitutes  reasonable  compensation  for  services  actually  rendered,  within  the  meaning  of  Section  280G(b)(4)(B)  of  the  Code,  in
excess  of  the  “base  amount”  (as  defined  in  Section  280G(b)(3)  of  the  Code)  allocable  to  such  reasonable  compensation,  (ii)  no  portion  of  the  Total
Payments the receipt or enjoyment of which an Eligible Employee shall have waived at such time and in such manner as not to constitute a “payment”
within the meaning of Section 280G(b) of the Code shall be taken into account, and (iii) the value of any non-cash benefit or any deferred payment or
benefit included in the Total Payments shall be determined by the 280G Firm in accordance with the principles of Sections 280G(d)(3) and (4) of the
Code. All determinations related to the calculations to be performed pursuant to this “Section 280G Treatment” section shall be done by the 280G Firm.
The 280G Firm will be directed to submit its determination and detailed supporting calculations to both the Eligible Employee and the Company within
fifteen (15) days after notification from either the Company or the Eligible Employee that the Eligible Employee may receive payments which may be
“parachute  payments.” The  Eligible  Employee  and  the  Company  will  each  provide  the  280G  Firm  access  to  and  copies  of  any  books,  records,  and
documents  as  may  be  reasonably  requested  by  the  280G  Firm,  and  otherwise  cooperate  with  the  280G  Firm  in  connection  with  the  preparation  and
issuance of the determinations and calculations contemplated by this Agreement. The fees and expenses of the 280G Firm for its services in connection
with the determinations and calculations contemplated by this Agreement will be borne solely by the Company.

12.

Miscellaneous.

(a)

 Assignment; Non-transferability; Successors . No right of an Eligible Employee to any payment or benefit under this Plan shall
be subject to assignment, anticipation, alienation, sale, transfer, assignment, pledge, encumbrance, attachment, or garnishment by creditors of the Eligible
Employee or of any beneficiary of the Eligible Employee. Any successor to the Company (whether direct or indirect and whether by purchase, lease,
merger, consolidation, liquidation or otherwise) to all or substantially all of the Company’s business and/or assets shall assume the obligations under this
Plan  and  agree  expressly  to  perform  any  of  the  Company’s  obligations  under  this  Plan. For  all  purposes  under  this  Plan,  the  term  “Company”  shall
include any successor to the Company’s business and/or assets which executes and delivers an assumption agreement or which becomes bound by the
terms  of  the  Plan  by  operation  of  law. All of an Eligible Employee’s rights hereunder shall inure to the benefit of, and be enforceable by, his or her
personal or legal representatives, executors, administrators, successors, heirs, distributees, devisees and legatees.

Withholding. The Company shall have the right to deduct from all payments hereunder all taxes that the Company determines
are  required  by  law  to  be  withheld  therefrom.  Regardless  of  the  amount  withheld,  the  recipient  of  payments,  benefits,  or  other  income  (including
imputed income) under the Plan shall be solely responsible for all taxes owed with respect to such payments, benefits, and other income.

(b)

  No  Right  To  Employment.  Nothing  in  this  Plan  shall  be  construed  as  giving  any  person  the  right  to  be  retained  in  the
employment of the Company, nor shall it affect the right of the Company to dismiss an Eligible Employee without any liability except as required by this
Plan.

(c)

(d)

 Amendment and Termination . The Administrator shall have the power to amend or terminate this Plan from time to time in its
discretion and for any reason (or no reason).  In no event shall any amendment or termination of this Plan affect the Severance Payments and Benefits
payable  under  this  Plan  to  any  Eligible  Employee  whose  Qualifying  Termination  has  occurred  prior  to  the  effective  date  of  the  amendment  or
termination of this Plan.

(e)

  Governing  Law.  This  Plan  is  a  welfare  plan  subject  to  ERISA  and  it  shall  be  interpreted,  administered,  and  enforced  in
accordance with that law. To the extent that state law is applicable, the validity, construction and effect of this Plan and any rules and regulations relating
to this Plan shall be determined in accordance with the laws of the State of California, without giving effect to principles of conflicts of laws. If any
provision hereof shall be held by a court of competent jurisdiction to be invalid and unenforceable, the remaining provisions shall continue to be fully
effective.

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(f)

 Venue. For purposes of settling any dispute or controversy arising hereunder, the Company and the Eligible Employee hereby
consent to the jurisdiction of any or all of the following courts: (i) the United States District Court for the Southern District of California or (ii) any of
the  courts  of  the  State  of  California.  The  Company  and  the  Eligible  Employee  hereby  waive,  to  the  fullest  extent  permitted  by  applicable  law,  any
objection which it may now or hereafter have to such courts’ jurisdiction and any defense of inconvenient forum with respect to such courts. This Section
12(f) shall not apply to any claims of violation of any federal or state employment discrimination laws.

(g)

  No  Duty  to  Mitigate.  No  employee  shall  be  required  to  mitigate,  by  seeking  employment  or  otherwise,  the  amount  of  any
payment that the Company becomes obligated to make under this Plan, and, except as expressly provided in this Plan, amounts or other benefits to be
paid or provided to an Eligible Employee pursuant to this Plan shall not be reduced by reason of the Eligible Employee’s obtaining other employment or
receiving similar payments or benefits from another employer.

 Employment at Will . Nothing contained in this Plan shall give any employee the right to be retained in the employment of the
Company  or  shall  otherwise  modify  the  employee’s  at  will  employment  relationship  with  the  Company.  This  Plan  is  not  a  contract  of  employment
between the Company and any employee.

(h)

(i)

Complete  Statement  of  Plan.  This  Plan  document  (which  incorporates  the  applicable Appendix(ces)  by  reference)  contains  a
complete statement of the Plan’s terms and supersedes all prior statements with respect to the Plan’s terms. No other evidence, whether written or oral,
shall be taken into account in interpreting the provisions of the Plan. In the event of a conflict between a provision in this Plan document and any booklet,
brochure, presentation, or other communication (whether written or oral), the provision of this Plan document shall control. This Plan shall be the only
plan, agreement or arrangement with respect to which benefits may be provided to an Eligible Employee upon a Qualifying Termination and supersedes
all  prior  agreements,  arrangements  or  related  communications  of  the  Company  relating  to  separation  benefits  or  accelerated  vesting  benefits  for  the
Eligible Employees, whether formal or informal, or written or unwritten.

Documentation. Each Eligible Employee’s participation in the Plan will be evidenced in a Participation Agreement, which may
be written or electronic, as the Administrator determines. Each Participation Agreement may contain terms and conditions in addition to those set forth in
the Plan.

(j)

hereunder (or their estates or beneficiaries, in the event of an eligible employee’s death) and the Company.

(k)

No  Third-Party  Beneficiaries.  This  Plan  shall  not  give  any  rights  or  remedies  to  any  person  other  than  Eligible  Employees

(l)

Funding  and  Payment  of  Benefits.  This  Plan  shall  be  maintained  in  a  manner  to  be  considered  “unfunded”  for  purposes  of
ERISA. The Company shall be required to make payments only as benefits become due and payable. No person shall have any right, other than the right
of  an  unsecured  general  creditor  against  the  Company,  with  respect  to  the  benefits  payable  hereunder,  or  which  may  be  payable  hereunder,  to  any
employee. If the Company, acting in its sole discretion, establishes a reserve or other fund associated with this Plan, no person shall have any right to or
interest in any specific amount or asset of such reserve or fund by reason of amounts which may be payable to such person under this Plan, nor shall such
person have any right to receive any payment under this Plan except as and to the extent expressly provided in this Plan. The assets in any such reserve or
fund shall be part of the general assets of the Company, subject to the control of the Company.

(m)

Notices. Any notice required or permitted by this Plan shall be in writing and shall be delivered as follows with notice deemed
given as indicated: (a) by personal delivery when delivered personally; (b) by overnight courier upon written verification of receipt; (c) by telecopy or
facsimile transmission upon acknowledgment of receipt of electronic transmission; or (d) by certified or registered mail, return receipt requested, upon
verification of receipt. Notice shall be sent to an Eligible Employee at the most recent address on the Company’s personnel records and to the Company
at its principal place of business, or such other address as either party may specify in writing.

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* * * * * * * *

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Exhibit 10.8

APPENDIX A

LIGAND PHARMACEUTICALS INCORPORATED
AMENDED AND RESTATED SEVERANCE PLAN
PARTICIPATION AGREEMENT

This Participation Agreement (the “ Agreement”) with respect to participation in the Ligand Pharmaceuticals Incorporated Amended and Restated
Severance  Plan  (the  “Plan”)  is  made  as  of  _______  by  and  between  Ligand  Pharmaceuticals  Incorporated  (the  “ Company”)  and  _________
(“Employee”). Capitalized terms not otherwise defined herein shall have the meanings given to them in the Plan.

WHEREAS, the Company has adopted and sponsors the Plan, a copy of which is attached hereto.

WHEREAS, Employee has been selected to participate in the Plan in accordance with and subject to the terms of the Plan and this Agreement.

NOW, THEREFORE, in consideration of the mutual promises made herein, the parties hereby agree as follows:

1 .     Participation  in  the  Plan .  Employee  has  been  designated  as  an  Eligible  Employee  in  the  Plan,  subject  to  Employee  executing  this
Agreement. The  terms  and  conditions  of  Employee’s  participation  in  the  Plan  are  as  set  forth  in  the  Plan. In  the  event  of  Employee’s  Qualifying
Termination, subject to satisfaction of the conditions set forth in the Plan, Employee will be eligible to receive the Severance Payments and Benefits set
forth in Section 6 of the Plan as follows:

Cash Severance:

Continued Health Benefits:

An amount equal to annual base salary, or annualized hourly wage rate, as applicable for (a) two
months  plus  (b)  one  week  for  each  12-month  period  of  continuous  and  uninterrupted  (or,  in  the
event of a partial year of service, continuous and uninterrupted service for at least six months and
one day during such year) (such period, the “Severance Period”).
An  amount  equal  to  the  portion  of  the  COBRA  coverage  premiums  that  exceeds  the  employee
contributions  immediately  prior  to  termination  for  the  period  beginning  on  the  termination  date
and  ending  on  the  earlier  of  the  last  day  of  the  Severance  Period  and  the  date  on  which  the
Employee  becomes  eligible  to  receive  benefits  under  a  “group  health  plan”  of  a  subsequent
employer.

The severance benefits and payments provided under the Plan are intended to be and are exclusive and in lieu of any other severance benefits and
payments to which Employee may otherwise be entitled, either at law, tort, or contract, in equity, or under the Plan, in the event of any termination of
Employee’s employment unless otherwise specifically agreed to by the Employee and the Company in an agreement entered into after the effective date
of the Plan. Employee hereby waives his or her rights to any severance benefits provided under any other agreement with the Company or arrangement
or plan sponsored by the Company.

2 .     Additional Provisions. This Agreement and the Plan, constitute the entire agreement of the parties with respect to the subject matter hereof
and supersede all prior agreements, written or oral. This Agreement may only be amended in writing signed by the parties hereto. In the event of any
conflict between this Agreement and the Plan, the Plan shall control. This Agreement may be executed in counterparts, and each counterpart shall have
the same force and effect as an original and shall constitute an effective, binding agreement on the part of each of the undersigned.

3 .    Acknowledgment. By his or her signature below, Employee agrees that participation in the Plan is governed by this Agreement and by the
provisions of the Plan, a copy of which is attached hereto and made a part of this document. Employee acknowledges receipt of a copy of the Plan,
represents that Employee has read and is familiar with its provisions and the provisions of this

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Agreement, and acknowledges that decisions and determinations by the Administrator under the Plan shall be final and binding on Employee.

(Signature Page Follows)

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By electronically accepting and signing this Agreement, each of the Company and Employee hereby acknowledges, accepts and agrees to the terms

of the Agreement as of the date first set forth above.

LIGAND PHARMACEUTICALS
INCORPORATED                    EMPLOYEE:

By:                                                 
Name:                             Print Name:                 
Title:                         

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APPENDIX B-1

RELEASE OF CLAIMS

[FOR EMPLOYEES 40 AND OVER]

[The Release of Claims is subject to revision by the Company based on changes in applicable law or local law requirements based on Employee’s
location or other updates based on best practices, as determined by the Administrator, in its sole discretion.]

        This  Release  of  Claims  (“Release”)  is  entered  into  as  of  _________________,  20__,  between  [__________]  (“ Employee”)  and  Ligand
Pharmaceuticals  Incorporated,  a  Delaware  corporation  (the  “Company”  and,  together  with  Employee,  the  “ Parties”),  effective  eight  days  after
Employee’s  signature  hereto  (the  “Effective Date”),  unless  Employee  revokes  Employee’s  acceptance  of  this  Release  as  provided  in  Paragraph  1(c),
below.

1.

Employee’s Release of the Company. Employee agrees not to sue, or otherwise file any claim against, the Company or its parent
companies,  subsidiaries  or  affiliates,  and  any  of  their  respective  successors,  assigns,  directors,  officers,  managers,  employees,  attorneys,  insurers,  or
agents, each in their respective capacities as such (collectively, the “ Company Parties”), for any reason whatsoever based on anything that has occurred
at any time up to and including the execution date of this Release as follows:

(a)

On  behalf  of  Employee  and  Employee’s  executors,  administrators,  heirs  and  assigns,  Employee  hereby  releases  and
forever discharge the Company Parties, and all persons acting by, through, under or in concert with them, or any of them, of and from any and all
manner of action or actions, cause or causes of action, in law or in equity, suits, debts, liens, contracts, agreements, promises, liability, claims,
demands, damages, loss, cost or expense, of any nature whatsoever, known or unknown, fixed or contingent (hereinafter called “Claims”), which
Employee  now  have  or  may  hereafter  have  against  any  of  the  Company  Parties  by  reason  of  any  matter,  cause,  or  thing  whatsoever  from  the
beginning of time through and including the execution date of this Release, including, without limiting the generality of the foregoing: any Claims
arising directly or indirectly out of, relating to, or in any other way involving in any manner whatsoever Employee’s employment by the Company
or  its  affiliates  or  the  separation  thereof,  including  without  limitation  any  and  all  Claims  arising  under  federal,  state,  or  local  laws  relating  to
employment; any Claims of any kind that may be brought in any court or administrative agency; any Claims arising under the Age Discrimination
in Employment Act, the Older Workers Benefits Protection Act, the Title VII of the Civil Rights Act of 1964, the Civil Rights Act of 1991, the
Equal Pay Act, the Civil Rights Act of 1866, Section 1981, 42 U.S.C. § 1981, the Family and Medical Leave Act of 1993, the Americans with
Disabilities  Act  of  1990,  the  False  Claims  Act,  the  Employee  Retirement  Income  Security  Act,  the  Worker  Adjustment  and  Retraining
Notification Act,  the  Fair  Labor  Standards Act,  the  Sarbanes-Oxley Act  of  2002,  the  National  Labor  Relations Act  of  1935,  the  Uniformed
Services Employment and Reemployment Rights Act of 1994, Fair Credit Reporting Act, or any similar state law,
 each of the foregoing as may
have been amended, and any other federal, state, or local statute, regulation, ordinance, constitution, or order concerning labor or employment,
termination of labor or employment, wages and benefits, retaliation, leaves of absence, or any other term or condition of employment; Claims for
breach  of  contract;  Claims  for  unfair  business  practices;  Claims  arising  in  tort,  including,  without  limitation,  Claims  of  wrongful  dismissal  or
discharge, discrimination, harassment, retaliation, fraud, misrepresentation, defamation, libel, infliction of emotional distress, violation of public
policy, and/or breach of the implied covenant of good faith and fair dealing; and Claims for damages or other remedies of any sort, including,
without limitation, compensatory damages, punitive damages, injunctive relief and attorney’s fees.

1

of law including, without limitation, (i)

(b)

Notwithstanding the generality of the foregoing, Employee does not release any Claims that cannot be released as a matter

 NTD: To include applicable state statutes based on participant’s state of employment.

6

1

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Employee’s right to file for unemployment insurance benefits or any state disability insurance benefits pursuant to the terms of applicable state
law; (ii) Employee’s right to file claims for workers’ compensation insurance benefits under the terms of any worker’s compensation insurance
policy  or  fund  of  the  Company;  (iii)  Employee’s  right  to  file  a  charge  of  discrimination,  harassment,  interference  with  leave  rights,  failure  to
accommodate, or retaliation with the Equal Employment Opportunity Commission or any other federal, state or local government agency, or to
cooperate with or participate in any investigation conducted by such agency; provided, however, that Employee hereby releases Employee’s right
to receive damages in any such proceeding brought by Employee or on Employee’s behalf; (iv) Employee’s right to communicate directly with the
U.S. Securities and Exchange Commission, the U.S. Commodity Futures Trading Commission, the U.S. Department of Justice or similar agency,
or to cooperate with or participate in any investigation by such agency; or (v) Employee’s right to make any disclosure that are protected under the
whistleblower provisions of applicable law. For the avoidance of doubt, Employee does not need to notify or obtain the prior authorization of the
Company to exercise any of the foregoing rights. Furthermore, Employee does not release hereby any rights that Employee may have relating to
(A)  indemnification  by  the  Company  or  its  affiliates  under  any  indemnification  agreement  with  the  Company,  the  Company’s  Bylaws  or  any
applicable law or under any applicable insurance policy with respect to Employee’s liability as an employee of the Company; (B) Employee’s
vested accrued benefits under the Company’s respective benefits and compensation plans; and (C) any severance payment entitlements to which
Employee  is  specifically  entitled  to  as  of  the  date  of  termination  pursuant  to  the  Ligand  Pharmaceuticals  Incorporated Amended  and  Restated
Severance Plan (the “Severance Plan”).

PROVISIONS OF CALIFORNIA CIVIL CODE SECTION 1542, WHICH PROVIDES AS FOLLOWS:

(c)

EMPLOYEE ACKNOWLEDGES  THAT  EMPLOYEE  HAS  BEEN ADVISED  OF AND  IS  FAMILIAR  WITH  THE

         “A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS THAT THE CREDITOR OR RELEASING PARTY DOES NOT
KNOW  OR  SUSPECT  TO  EXIST  IN  HIS  OR  HER  FAVOR  AT  THE  TIME  OF  EXECUTING  THE  RELEASE,  AND  THAT,  IF
KNOWN BY HIM OR HER, WOULD HAVE MATERIALLY, AFFECTED HIS OR HER SETTLEMENT WITH THE DEBTOR OR
RELEASED PARTY.”

BEING AWARE  OF  SAID  CODE  SECTION,  EMPLOYEE  HEREBY  EXPRESSLY  WAIVES ANY  RIGHTS  HE  OR  SHE
MAY HAVE THEREUNDER, AS WELL AS UNDER ANY OTHER STATUTES OR COMMON LAW PRINCIPLES OF SIMILAR EFFECT.

Employee acknowledges that the General Release of Claims set forth in Section 1(a) above includes a release of Claims
under  the  Age  Discrimination  in  Employment  Act  (the  “ ADEA  Release”).  In  accordance  with  the  Older  Workers  Benefit  Protection  Act,
Employee acknowledges as follows:

(d)

either has so consulted with counsel or voluntarily decided not to consult with counsel;

(i)

Employee has been advised to consult an attorney of Employee’s choice before signing this Release and Employee

Employee has been granted [twenty-one (21)] [forty-five (45)]  days after Employee is presented with this Release
to  decide  whether  or  not  to  sign  it.  Employee  agrees  that  such  period  shall  not  be  extended  due  to  any  material  or  immaterial  changes  to  the
Release.  If  Employee  executes  this  Release  prior  to  the  expiration  of  such  period,  Employee  does  so  voluntarily  and  after  having  had  the
opportunity to consult with an attorney, and hereby waive the remainder of the [twenty-one (21)] [forty-five (45)] day period;

(ii)

2

all exhibits hereto;

(iii)

Employee has carefully reviewed and considered and fully understand the terms set forth in this Release, including

 NTD: To be 45 days for a group termination and 21 days for a non-group termination.

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[Employee  understands  that Attachment 1 to this Release is a list of the job titles and ages for all individuals in
Employee’s decisional unit who have been selected for the program, as well as the job titles and ages of all individuals in Employee’s decisional
unit who have not been selected for the program, as of [_____], the date the Company provided this Release to Employee;]  and

(iv)

3

Employee  has  the  right  to  revoke  Employee’s  ADEA  Release  within  seven  (7)  calendar  days  of  signing  this
Release. If Employee wishes to revoke Employee’s ADEA Release, Employee must deliver written notice stating Employee’s intent to so revoke
to [Insert Name/Contact Information], on or before 5:00 p.m. on the seventh (7th) day after the date on which Employee signs this Release.

(v)

Release is effective within [____]  days following the Employee’s Date of Termination (as defined in the Severance Plan).

4

(e)

Employee acknowledges that Employee will not be entitled to the severance benefits under the Severance Plan unless this

2.

Employee Representations. Employee represents and warrants that:

Employee has returned to the Company all Company property in Employee’s possession (other than any property that the
Company has specifically permitted the Employee to keep following his or her Date of Termination in writing), including without limitation, any
cell phone, laptop computer or tablet;

(a)

Employee  is  not  owed  wages,  commissions,  bonuses  or  other  compensation,  other  than  wages  through  the  Date  of
Termination of Employee’s employment and any accrued, unused vacation or paid time off earned through such date, other than as set forth in the
Severance Plan;

(b)

During  the  course  of  Employee’s  employment,  Employee  did  not  sustain  any  injuries  for  which  Employee  might  be
entitled  to  compensation  pursuant  to  worker’s  compensation  law  or  Employee  has  disclosed  any  injuries  of  which  Employee  is  currently,
reasonably aware for which Employee might be entitled to compensation pursuant to worker’s compensation law; and

(c)

Employee  has  not  initiated  any  adversarial  proceedings  of  any  kind  against  the  Company  or  its  affiliates  or,  in  their
capacities as such, against any other person or entity released herein, nor will Employee do so in the future, except as specifically allowed by this
Release.

(d)

3.

Restrictive  Covenants;  Cooperation.  Employee  reaffirms  Employee’s  continuing  obligations  under  Section  8  of  the  Plan. In
addition,  Employee  shall  cooperate  with  the  Company  and  its  affiliates,  upon  the  Company’s  reasonable  request,  with  respect  to  any  internal
investigation  or  administrative,  regulatory  or  judicial  proceeding  involving  matters  within  the  scope  of  Employee’s  duties  and  responsibilities  to  the
Company or its affiliates during Employee’s employment with the Company (including, without limitation, Employee being available to the Company
upon  reasonable  notice  for  interviews  and  factual  investigations,  appearing  at  the  Company’s  reasonable  request  to  give  testimony  without  requiring
service  of  a  subpoena  or  other  legal  process,  and  turning  over  to  the  Company  all  relevant  Company  documents  which  are  or  may  have  come  into
Employee’s possession during his or her employment); provided,  however, that any such request by the Company shall not be unduly burdensome or
interfere with Employee’s personal schedule or ability to engage in gainful employment.

WARN  Offset .  Without  limiting  Section  7(b)  of  the  Severance  Plan,  Employee  acknowledges  and  agrees  that,  unless
otherwise determined by the Administrator (as defined in the Severance Plan), Employee’s severance benefits pursuant to the Severance Plan
shall be reduced, in whole or in part, by any other severance benefits, pay in lieu of notice, or other

4.

 NTD: To be included for group termination.

 NTD: To be 55 days for a group termination and 30 days for a non-group termination.

8

3

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similar  benefits  payable  to  Employee  by  the  Company  that  become  payable  in  connection  with  Employee’s  termination  of  employment
pursuant  to  any  applicable  legal  requirement,  including,  without  limitation,  the  Worker Adjustment  and  Retraining  Notification Act  or  any
similar state or local statute, rule or regulation.

affect the validity or enforceability of any other provision.

Severability. The  provisions  of  this  Release  are  severable. If  any  provision  is  held  to  be  invalid  or  unenforceable,  it  shall  not

including all matters of construction, validity and performance, without regard to conflicts of law principles.

5
Choice of Law. This Release shall in all respects be governed and construed in accordance with the laws of the State of [____] ,

5.

6.

Integration Clause.  This Release, and the Severance Plan contain the Parties’ entire agreement with regard to the separation of
Employee’s employment, and supersede and replace any prior agreements as to those matters, whether oral or written. This Release may not be changed
or modified, in whole or in part, except by an instrument in writing signed by Employee and a duly authorized officer or director of the Company.

7.

executed in a single document. Facsimile signatures shall have the same force and effectiveness as original signatures.

8.

Execution  in  Counterparts.  This  Release  may  be  executed  in  counterparts  with  the  same  force  and  effectiveness  as  though

provisions; and intend and agree that it is final and binding on all Parties.

9.

Intent  to  be  Bound.  The  Parties  have  carefully  read  this  Release  in  its  entirety;  fully  understand  and  agree  to  its  terms  and

(Signature Page Follows)

5

 NTD: To be the employee’s state of employment.

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9

IN WITNESS WHEREOF, and intending to be legally bound, the Parties have executed the foregoing on the dates shown below.

EMPLOYEE

LIGAND PHARMACEUTICALS INCORPORATED

Name:

Date:

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Name:
Title:
Date:

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[ATTACHMENT 1 TO APPENDIX B-1

Older Worker Benefit Protection Act Disclosure ]

[To be included if applicable]

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APPENDIX B-2

RELEASE OF CLAIMS

[FOR EMPLOYEES UNDER 40]

[The Release of Claims is subject to revision by the Company based on changes in applicable law or local law requirements based on Employee’s
location or other updates based on best practices, as determined by the Administrator, in its sole discretion.]

        This  Release  of  Claims  (“Release”)  is  entered  into  as  of  _________________,  20__,  between  [__________]  (“ Employee”)  and  Ligand
Pharmaceuticals  Incorporated,  a  Delaware  corporation  (the  “Company”  and,  together  with  Employee,  the  “ Parties”),  effective  as  of  Employee’s
signature hereto (the “Effective Date”).

1.

Employee’s Release of the Company. Employee agrees not to sue, or otherwise file any claim against, the Company or its parent
companies,  subsidiaries  or  affiliates,  and  any  of  their  respective  successors,  assigns,  directors,  officers,  managers,  employees,  attorneys,  insurers,  or
agents, each in their respective capacities as such (collectively, the “ Company Parties”), for any reason whatsoever based on anything that has occurred
at any time up to and including the execution date of this Release as follows:

(a)

On  behalf  of  Employee  and  Employee’s  executors,  administrators,  heirs  and  assigns,  Employee  hereby  releases  and
forever discharge the Company Parties, and all persons acting by, through, under or in concert with them, or any of them, of and from any and all
manner of action or actions, cause or causes of action, in law or in equity, suits, debts, liens, contracts, agreements, promises, liability, claims,
demands, damages, loss, cost or expense, of any nature whatsoever, known or unknown, fixed or contingent (hereinafter called “Claims”), which
Employee  now  have  or  may  hereafter  have  against  any  of  the  Company  Parties  by  reason  of  any  matter,  cause,  or  thing  whatsoever  from  the
beginning of time through and including the execution date of this Release, including, without limiting the generality of the foregoing: any Claims
arising directly or indirectly out of, relating to, or in any other way involving in any manner whatsoever Employee’s employment by the Company
or  its  affiliates  or  the  separation  thereof,  including  without  limitation  any  and  all  Claims  arising  under  federal,  state,  or  local  laws  relating  to
employment; any Claims of any kind that may be brought in any court or administrative agency; any Claims arising under the Title VII of the Civil
Rights Act of 1964, the Civil Rights Act of 1991, the Equal Pay Act, the Civil Rights Act of 1866, Section 1981, 42 U.S.C. § 1981, the Family
and Medical Leave Act of 1993, the Americans with Disabilities Act of 1990, the False Claims Act, the Employee Retirement Income Security
Act, the Worker Adjustment and Retraining Notification Act, the Fair Labor Standards Act, the Sarbanes-Oxley Act of 2002, the National Labor
Relations Act of 1935, the Uniformed Services Employment and Reemployment Rights Act of 1994, Fair Credit Reporting Act, or any similar
state law,  each of the foregoing as may have been amended, and any other federal, state, or local statute, regulation, ordinance, constitution, or
order concerning labor or employment, termination of labor or employment, wages and benefits, retaliation, leaves of absence, or any other term or
condition of employment; Claims for breach of contract; Claims for unfair business practices; Claims arising in tort, including, without limitation,
Claims  of  wrongful  dismissal  or  discharge,  discrimination,  harassment,  retaliation,  fraud,  misrepresentation,  defamation,  libel,  infliction  of
emotional distress, violation of public policy, and/or breach of the implied covenant of good faith and fair dealing; and Claims for damages or
other remedies of any sort, including, without limitation, compensatory damages, punitive damages, injunctive relief and attorney’s fees.

6

(b)

Notwithstanding the generality of the foregoing, Employee does not release any Claims that cannot be released as a matter
of law including, without limitation, (i) Employee’s right to file for unemployment insurance benefits or any state disability insurance benefits
pursuant to the terms of applicable state law; (ii) Employee’s right to file claims for workers’ compensation insurance benefits under the terms of
any  worker’s  compensation  insurance  policy  or  fund  of  the  Company;  (iii)  Employee’s  right  to  file  a  charge  of  discrimination,  harassment,
interference with leave rights, failure to accommodate, or retaliation with the Equal Employment Opportunity Commission or any other federal,
state or local government agency, or to cooperate with or

 NTD: To include applicable state statutes based on participant’s state of employment.

1

6

|

participate in any investigation conducted by such agency; provided, however, that Employee hereby releases Employee’s right to receive damages
in any such proceeding brought by Employee or on Employee’s behalf; (iv) Employee’s right to communicate directly with the U.S. Securities and
Exchange Commission, the U.S. Commodity Futures Trading Commission, the U.S. Department of Justice or similar agency, or to cooperate with
or  participate  in  any  investigation  by  such  agency;  or  (v)  Employee’s  right  to  make  any  disclosure  that  are  protected  under  the  whistleblower
provisions of applicable law. For the avoidance of doubt, Employee does not need to notify or obtain the prior authorization of the Company to
exercise  any  of  the  foregoing  rights. Furthermore,  Employee  does  not  release  hereby  any  rights  that  Employee  may  have  relating  to  (A)
indemnification  by  the  Company  or  its  affiliates  under  any  indemnification  agreement  with  the  Company,  the  Company’s  Bylaws  or  any
applicable law or under any applicable insurance policy with respect to Employee’s liability as an employee of the Company; (B) Employee’s
vested accrued benefits under the Company’s respective benefits and compensation plans; and (C) any severance payment entitlements to which
Employee  is  specifically  entitled  to  as  of  the  date  of  termination  pursuant  to  the  Ligand  Pharmaceuticals  Incorporated Amended  and  Restated
Severance Plan (the “Severance Plan”).

PROVISIONS OF CALIFORNIA CIVIL CODE SECTION 1542, WHICH PROVIDES AS FOLLOWS:

(c)

EMPLOYEE ACKNOWLEDGES  THAT  EMPLOYEE  HAS  BEEN ADVISED  OF AND  IS  FAMILIAR  WITH  THE

         “A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS THAT THE CREDITOR OR RELEASING PARTY DOES NOT
KNOW  OR  SUSPECT  TO  EXIST  IN  HIS  OR  HER  FAVOR  AT  THE  TIME  OF  EXECUTING  THE  RELEASE,  AND  THAT,  IF
KNOWN BY HIM OR HER, WOULD HAVE MATERIALLY AFFECTED HIS OR HER SETTLEMENT WITH THE DEBTOR OR
RELEASED PARTY.”

BEING AWARE  OF  SAID  CODE  SECTION,  EMPLOYEE  HEREBY  EXPRESSLY  WAIVES ANY  RIGHTS  HE  OR  SHE
MAY HAVE THEREUNDER, AS WELL AS UNDER ANY OTHER STATUTES OR COMMON LAW PRINCIPLES OF SIMILAR EFFECT.

Release is effective within 10 days following the Employee’s Date of Termination (as defined in the Severance Plan).

(d)

Employee acknowledges that Employee will not be entitled to the severance benefits under the Severance Plan unless this

2.

Employee Representations. Employee represents and warrants that:

Employee has returned to the Company all Company property in Employee’s possession (other than any property that the
Company has specifically permitted the Employee to keep following his or her Date of Termination in writing), including without limitation, any
cell phone, laptop computer or tablet;

(a)

Employee  is  not  owed  wages,  commissions,  bonuses  or  other  compensation,  other  than  wages  through  the  Date  of
Termination of Employee’s employment and any accrued, unused vacation or paid time off earned through such date, other than as set forth in the
Severance Plan;

(b)

During  the  course  of  Employee’s  employment,  Employee  did  not  sustain  any  injuries  for  which  Employee  might  be
entitled  to  compensation  pursuant  to  worker’s  compensation  law  or  Employee  has  disclosed  any  injuries  of  which  Employee  is  currently,
reasonably aware for which Employee might be entitled to compensation pursuant to worker’s compensation law; and

(c)

Employee  has  not  initiated  any  adversarial  proceedings  of  any  kind  against  the  Company  or  its  affiliates  or,  in  their
capacities as such, against any other person or entity released herein, nor will Employee do so in the future, except as specifically allowed by this
Release.

(d)

Restrictive  Covenants;  Cooperation.  Employee  reaffirms  Employee’s  continuing  obligations  under  Section  8  of  the  Plan. In
addition,  Employee  shall  cooperate  with  the  Company  and  its  affiliates,  upon  the  Company’s  reasonable  request,  with  respect  to  any  internal
investigation or

3.

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2

administrative,  regulatory  or  judicial  proceeding  involving  matters  within  the  scope  of  Employee’s  duties  and  responsibilities  to  the  Company  or  its
affiliates during Employee’s employment with the Company (including, without limitation, Employee being available to the Company upon reasonable
notice  for  interviews  and  factual  investigations,  appearing  at  the  Company’s  reasonable  request  to  give  testimony  without  requiring  service  of  a
subpoena  or  other  legal  process,  and  turning  over  to  the  Company  all  relevant  Company  documents  which  are  or  may  have  come  into  Employee’s
possession during his or her employment); provided, however, that any such request by the Company shall not be unduly burdensome or interfere with
Employee’s personal schedule or ability to engage in gainful employment.

4.

WARN  Offset .  Without  limiting  Section  7(b)  of  the  Severance  Plan,  Employee  acknowledges  and  agrees  that,  unless
otherwise determined by the Administrator (as defined in the Severance Plan), Employee’s severance benefits pursuant to the Severance Plan
shall be reduced, in whole or in part, by any other severance benefits, pay in lieu of notice, or other similar benefits payable to Employee by the
Company  that  become  payable  in  connection  with  Employee’s  termination  of  employment  pursuant  to  any  applicable  legal  requirement,
including, without limitation, the Worker Adjustment and Retraining Notification Act or any similar state or local statute, rule or regulation.

affect the validity or enforceability of any other provision.

Severability. The  provisions  of  this  Release  are  severable. If  any  provision  is  held  to  be  invalid  or  unenforceable,  it  shall  not

including all matters of construction, validity and performance, without regard to conflicts of law principles.

7
Choice of Law. This Release shall in all respects be governed and construed in accordance with the laws of the State of [____] ,

Integration Clause.  This Release, and the Severance Plan contain the Parties’ entire agreement with regard to the separation of
Employee’s employment, and supersede and replace any prior agreements as to those matters, whether oral or written. This Release may not be changed
or modified, in whole or in part, except by an instrument in writing signed by Employee and a duly authorized officer or director of the Company.

7.

executed in a single document. Facsimile signatures shall have the same force and effectiveness as original signatures.

Execution  in  Counterparts.  This  Release  may  be  executed  in  counterparts  with  the  same  force  and  effectiveness  as  though

provisions; and intend and agree that it is final and binding on all Parties.

Intent  to  be  Bound.  The  Parties  have  carefully  read  this  Release  in  its  entirety;  fully  understand  and  agree  to  its  terms  and

5.

6.

8.

9.

(Signature Page Follows)

7

 NTD: To be the employee’s state of employment.

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3

IN WITNESS WHEREOF, and intending to be legally bound, the Parties have executed the foregoing on the dates shown below.

EMPLOYEE

LIGAND PHARMACEUTICALS INCORPORATED

Name:

Date:

|

Name:
Title:
Date:

4

    
    
APPENDIX C

DETAILED CLAIMS PROCEDURES

1.

Claims Procedure

Claims for benefits under the Plan shall be administered in accordance with Section 503 of ERISA and the Department of Labor Regulations
thereunder. The Administrator shall make all determinations as to the rights of any Claimant.  A Claimant may authorize a representative to act on his or
her behalf with respect to any claim under the Plan.

Initial Claims

All claims shall be presented to the Administrator in writing at the address in  Appendix D.  Within ninety (90) days after receiving a claim, a
claims  official  appointed  by  the Administrator  shall  consider  the  claim  and  issue  his  or  her  determination  thereon  in  writing. If  the Administrator  or
claims official determines that an extension of time is necessary, the claims official may extend the determination period for up to an additional ninety
(90) days by giving the Claimant written notice indicating the special circumstances requiring the extension of time prior to the termination of the initial
ninety (90) day period and the date by which the Administrator expects to render a decision. Any claims that the Claimant does not pursue in good faith
through the initial claims stage, such as by failing to file a timely claim, shall be treated as having been irrevocably waived.

Claims Decisions

If the claim is granted, the benefits or relief the Claimant seeks shall be provided. If the claim is wholly or partially denied, the claims official
shall, within ninety (90) days (or a longer period, as described above), provide the Claimant with written notice of the denial, setting forth, in a manner
calculated to be understood by the Claimant: (1) the specific reason or reasons for the denial; (2) specific references to the Plan provisions on which the
denial is based; (3) a description of any additional material or information necessary for the Claimant to perfect the claim, together with an explanation
of why the material or information is necessary; and (4) an explanation of the procedures for appealing denied claims and time limits applicable to such
procedures,  including  a  statement  of  the  Claimant’s  right  to  bring  an  action  under  Section  502(a)  of  ERISA  after  receiving  a  final  adverse  benefit
determination upon appeal. If the Claimant can establish that the claims official has failed to respond to the claim in a timely manner, the Claimant may
treat the claim as having been denied by the claims official.

Appeals of Denied Claims

Each Claimant shall have the opportunity to appeal the claims official’s denial of a claim. All appeals shall be presented to the Administrator in
writing at the address in Appendix D. The appeal will be reviewed by the Administrator or its designee (the “ appeals official”). A Claimant must appeal
a denied claim within sixty (60) days after receipt of written notice of denial of the claim, or within sixty (60) days after it was due if the Claimant did
not receive it by its due date, subject to the temporary extension of deadlines described in the paragraph below. The Claimant shall have the opportunity
to  submit  written  comments,  documents,  records  and  other  information  relating  to  the  Claimant’s  claim. The  Claimant  (or  the  Claimant’s  duly
authorized  representative)  shall  be  provided  upon  request  and  free  of  charge,  reasonable  access  to,  and  copies  of,  all  documents,  records  and  other
information relevant to the Claimant’s claim. The appeals official shall take into account during its review all comments, documents, records and other
information  submitted  by  the  Clamant  relating  to  the  claim,  without  regard  to  whether  such  information  was  submitted  or  considered  in  the  initial
benefits review. Any claims that the Claimant does not pursue in good faith through the appeals stage, such as by failing to file a timely appeal request,
shall be treated as having been irrevocably waived.

Temporary Extension of Deadlines to File Claims and Appeals

|

The  Employee  Benefits  Security  Administration,  Department  of  Labor,  Internal  Revenue  Service  and  Department  of  the  Treasury  (the
“Agencies”) issued COVID-19-related relief to temporarily extend the deadlines to file ERISA claims and appeals. Under this relief, the period from
March  1,  2020  until  sixty  (60)  days  after  the  announced  end  of  the  national  emergency  (or  such  other  date  announced  by  the  Agencies)  will  be
disregarded in determining the deadlines for a Claimant to file claims and appeals under Section 14.3 and this Appendix C, provided, however, that no
more than one (1) year will be disregarded in determining a given deadline.

Appeals Decisions

The  decision  by  the  appeals  official  shall  be  made  not  later  than  sixty  (60)  days  after  the  written  appeal  is  received  by  the Administrator,
however, if the appeals official determines that an extension of time is necessary, the appeals official may extend the determination period for up to an
additional  sixty  (60)  days  by  giving  the  Claimant  written  notice  prior  to  the  termination  of  the  initial  sixty  (60)  day  period  indicating  the  special
circumstances requiring the extension of time and the date by which a determination on appeal is expected to be rendered.

However, if the appeals official is a committee that meets at least quarterly, then the decision by the appeals official shall be made not later than
the  date  of  the  meeting  that  immediately  follows  the  Plan’s  receipt  of  an  appeal  request,  unless  the  appeal  request  is  filed  within  thirty  (30)  days
preceding the date of such meeting. In such case, a benefit determination may be made by no later than the date of the second meeting following the
Plan’s receipt of the appeal request. If special circumstances require a further extension of time for processing, a benefit determination shall be rendered
no  later  than  the  third  meeting  of  the  appeals  official  following  the  Plan’s  receipt  of  the  appeal  request. If  such  an  extension  of  time  for  review  is
required,  the  appeals  official  shall  provide  the  Claimant  with  written  notice  of  the  extension,  describing  the  special  circumstances  and  the  date  as  of
which the benefit determination will be made, prior to the commencement of the extension. The appeals official shall notify the Claimant of the benefit
determination as soon as possible but not later than five (5) days after it has been made.

The  appeal  decision  shall  be  in  writing,  shall  be  set  forth  in  a  manner  calculated  to  be  understood  by  the  Claimant  and  shall  include  the
following: (1) the specific reason or reasons for the denial; (2) specific references to the Plan provisions on which the denial is based; (3) a statement that
the Claimant is entitled to receive, upon request and free of charge, reasonable access to, and copies of, all documents, records and other information
relevant to the Claimant’s claim; and (4) a statement of the employee’s right to bring an action under Section 502(a) of ERISA.  If a Claimant does not
receive the appeal decision by the date it is due, the Claimant may deem the appeal to have been denied. Subject to applicable law, any decision made in
accordance with the claims procedures in this Appendix C is final and binding on all parties and shall be given the maximum possible deference allowed
by law.

Procedures

The Administrator shall adopt procedures by which initial claims shall be considered and appeals shall be resolved; different procedures may be

established for different claims. All procedures shall be designed to afford a Claimant full and fair consideration of his or her claim and appeal.

Exhaustion; Judicial Proceedings

No action at law or in equity shall be brought to recover benefits under the Plan until the claim and appeal rights described in the Plan have been
exercised and the Plan benefits requested in such appeal have been denied in whole or in part. If any judicial proceeding is undertaken to appeal the
denial of a claim, the evidence presented may be strictly limited to the evidence timely presented to the Administrator and the appeals official. Any such
judicial proceeding must be filed by the earlier of: (a) one year after the final decision regarding the appeal or (b) one year after the Participant or other
Claimant commenced payment of the Plan benefits at issue in the judicial proceeding.

|

APPENDIX D

ADDITIONAL INFORMATION

RIGHTS UNDER ERISA

As a participant in the Plan, you are entitled to certain rights and protections under ERISA. ERISA provides that all Plan participants will be

entitled to:

Receive Information About Your Plan and Benefits

1.

Examine, without charge, at the Company’s headquarters, all documents governing the Plan, and a copy of the latest annual report (Form
5500  Series)  filed  by  the  Plan  with  U.S.  Department  of  Labor  and  available  at  the  Public  Disclosure  Room  of  the  Pension  and  Welfare  Benefit
Administration, if any.

annual report (Form 5500 Series), if any, and updated summary plan description. The Administrator may make a reasonable charge for the copies.

Obtain, upon written request to the Administrator, copies of documents governing the operation of the Plan, including copies of the latest

copy of this summary annual report.

Receive a summary of the Plan’s annual financial report, if any.  The Administrator is required by law to furnish each participant with a

2.

3.

Prudent Actions by Plan Fiduciaries

In addition to creating rights for Plan participants, ERISA imposes duties upon the people who are responsible for the operation of the employee
benefit plan. The people who operate your Plan, called “fiduciaries” of the Plan, have a duty to do so prudently and in the interest of you and other Plan
participants  and  beneficiaries. No one, including the Company, or any other person, may fire you or otherwise discriminate against you in any way to
prevent you from obtaining a welfare benefit or exercising your right under ERISA.

Enforce Your Rights

If your claim for a welfare benefit is denied or ignored, in whole or in part, you have a right to know why this was done, to obtain copies of
documents relating to the decision without charge, and to appeal any denial, all within certain time schedules. Under ERISA, there are steps you can take
to  enforce  the  above  rights. For  instance,  if  you  request  a  copy  of  plan  documents  or  the  latest  annual  report  from  the  Plan  and  do  not  receive  them
within thirty (30) days, you may file suit in a Federal court. In such a case, the court may require the Administrator to provide the materials and pay you
up to $110 a day until you receive the materials, unless the materials were not sent because of reasons beyond the control of the Administrator.  If you
have  a  claim  for  benefits,  which  is  denied  or  ignored,  in  whole  or  in  part,  you  may  file  suit  in  a  state  or  Federal  court. If  it  should  happen  that  Plan
fiduciaries misuse the Plan’s money, or if you are discriminated against for asserting your rights, you may seek assistance from the U.S. Department of
Labor, or you may file suit in a federal court. The court will decide who should pay court costs and legal fees. If you are successful, the court may order
the person you have sued to pay these costs and fees. If you lose, the court may order you to pay these costs and fees, for example, if it finds your claim
is frivolous.

Assistance with Your Questions

If you have any questions about your Plan, you should contact the Administrator.  If you should have any questions about this statement or about
your  rights  under  ERISA,  or  if  you  need  assistance  in  obtaining  documents  from  the  Administrator,  you  should  contact  the  nearest  office  of  the
Employee Benefits Security Administration, U.S. Department of Labor, listed in your telephone directory or the Division of Technical Assistance and
Inquiries, Employee Benefits Security Administration, U.S. Department of Labor, 200 Constitution Avenue N.W., Washington, D.C. 20210.  You may
also obtain certain publications about your rights and responsibilities under ERISA by calling the publications hotline of the Employee Benefits Security
Administration.

|

Ligand Pharmaceuticals Incorporated Amended and Restated Severance Plan
Ligand Pharmaceuticals Incorporated
3911 Sorrento Valley Blvd, Suite 110
San Diego, CA 92121-1457
Tel: (858) 550-7500

Human Capital Management and Compensation Committee of the Board of Directors of
Ligand Pharmaceuticals Incorporated
3911 Sorrento Valley Blvd, Suite 110
San Diego, CA 92121-1457
Tel: (858) 550-7500

Self-Administered
Severance Pay Employee Welfare Benefit Plan
77-0160744
General Counsel
Ligand Pharmaceuticals Incorporated
3911 Sorrento Valley Blvd, Suite 110
San Diego, CA 92121-1457
Tel: (858) 550-7500

General Counsel
Ligand Pharmaceuticals Incorporated
3911 Sorrento Valley Blvd, Suite 110
San Diego, CA 92121-1457
Tel: (858) 550-7500

Service of Legal Process may also be made upon the Plan Administrator.

December 31
502
The Plan is unfunded. Plan benefits are paid as needed from the general assets of the
Company.

Administrative Information
Name of Plan:
Plan Sponsor:

Plan Administrator:

Type of Administration:
Type of Plan:
Employer Identification Number:
Direct Questions Regarding the Plan to:

Agent for Service of Legal Process:

Plan Year End:
Plan Number:
Funding:

|

Exhibit 10.9

LIGAND PHARMACEUTICALS INCORPORATED

DIRECTOR COMPENSATION AND STOCK OWNERSHIP POLICY

(Amended and Restated Effective April 13, 2020)

I. DIRECTOR COMPENSATION

Non-employee members of the board of directors (the “Board”) of Ligand Pharmaceuticals Incorporated (the “Company”) shall be eligible to receive cash and equity
compensation effective as of April 13, 2020 (the “Restatement Effective Date”), as set forth in this Director Compensation Policy. The cash compensation and stock awards
described in this Director Compensation Policy shall be paid or be made, as applicable, automatically and without further action of the Board, to each member of the Board who
is not an employee of the Company or any parent or subsidiary of the Company (each, an “Independent Director”) who may be eligible to receive such cash compensation or
stock awards, unless such Independent Director declines the receipt of such cash compensation or stock awards by written notice to the Chairman of the Board. This Director
Compensation Policy shall remain in effect until it is revised or rescinded by further action of the Board. The terms and conditions of this Director Compensation Policy shall
supersede any prior cash or equity compensation arrangements between the Company and its directors.

1. Cash Compensation.

a. Annual Retainer. Each Independent Director shall be eligible to receive an annual retainer of $50,000 for service on the Board. In addition, an Independent

Director serving as:

i. chairman of the Board shall be eligible to receive an additional annual retainer of $30,000 for such service;

ii.chairman of the Audit Committee shall be eligible to receive an additional annual retainer of $20,000 for such service;

iii.

members (other than the chairman) of the Audit Committee shall be eligible to receive an additional annual retainer of $10,000 for such

service;

iv.

chairman of the Compensation Committee shall be eligible to receive an additional annual retainer of $15,000 for such service;

v. members (other than the chairman) of the Compensation Committee shall be eligible to receive an additional annual retainer of $7,500 for such

service;

vi.

chairman of the Nominating and Corporate Governance Committee shall be eligible to receive an additional annual retainer of $10,000 for

such service; and

vii.

members (other than the chairman) of the Nominating and Corporate Governance Committee shall be eligible to receive an additional annual

retainer of $5,000 for such service.

b. Payment of Cash Compensation. Annual retainer fees shall be paid after each annual meeting of the Company’s stockholders in advance for the upcoming year
of service and shall be prorated for the period of the year served for Independent Directors who are elected or appointed to the Board at a time other than the
date of the annual meeting of the Company’s stockholders; provided, however, that an Independent Director may elect in writing prior to the date of an annual
meeting to receive all or a portion of his annual retainer fee in the form of such number of fully vested shares of the Company’s common stock as is equal to (i)
the amount of the annual retainer the Independent Director has elected to receive in the form of shares of the Company’s common stock, divided by (ii) the
closing price per share of the Company’s common stock on the Nasdaq Global Market (or such other established stock exchange or national quotation system
on which the stock is quoted) on the date of the annual meeting. Committee retainer fees shall also be paid annually after each annual meeting of the
Company’s stockholders in advance for the upcoming year of service and shall be prorated for any partial quarters served for Independent Directors who serve
on a committee for a partial year.

1

2. Equity Compensation. The Independent Directors shall be granted the following stock awards. The stock awards described below shall be granted under and shall be

subject to the terms and provisions of the Company’s 2002 Stock Incentive Plan (the “2002 Plan”) and shall be granted subject to the execution and delivery of award
agreements, including attached exhibits, in substantially the same forms previously approved by the Board.

a.

Initial Stock Awards. A person who is initially elected or appointed to the Board on or after the Restatement Effective Date, and who was or is an Independent
Director at the time of such initial election or appointment, shall be eligible to receive the following stock awards on the date of such initial election or
appointment (each, an “Initial Stock Award”):

i. that number of restricted stock units determined by dividing (A) $145,000, by (B) the average closing price per share of the Company’s common stock
on the Nasdaq Global Market (or such other established stock exchange or national quotation system on which the stock is quoted) for the 60-calendar
day period prior to the date of grant; and

ii.that number of stock options having a value of $280,000, calculated on the grant date in accordance with the Black-Scholes option pricing model

(utilizing the same assumptions that the Company utilizes in preparation of its financial statements).

b. Subsequent Stock Awards. A person who is an Independent Director as of the date of each annual meeting of the Company’s stockholders and who is re-

elected for another year of service as an Independent Director at such annual meeting automatically shall be eligible to receive the following stock awards on
the date of each such annual meeting of the Company’s stockholders on or after the Restatement Effective Date (each, a “Subsequent Stock Award”):

i. that number of restricted stock units determined by dividing (A) $85,000, by (B) the average closing price per share of the Company’s common stock
on the Nasdaq Global Market (or such other established stock exchange or national quotation system on which the stock is quoted) for the 60-calendar
day period prior to the date of grant; and

ii.that number of stock options having a value of $175,000, calculated on the grant date in accordance with the Black-Scholes option pricing model

(utilizing the same assumptions that the Company utilizes in preparation of its financial statements).

An Independent Director elected for the first time to the Board at an annual meeting of stockholders shall only receive an Initial Restricted Stock grant in

connection with such election, and shall not receive a Subsequent Restricted Stock grant on the date of such meeting as well. The stock awards described in this clause shall be
referred to as “Subsequent Stock Awards.”

c. Termination of Employment of Employee Directors. Members of the Board who are employees of the Company or any parent or subsidiary of the Company
who subsequently terminate their employment with the Company and any parent or subsidiary of the Company and remain on the Board will not receive any
Initial Stock Awards pursuant to clause 2(a) above, but to the extent that they are otherwise eligible, will be eligible to receive, after termination from
employment with the Company and any parent or subsidiary of the Company, Subsequent Stock Awards as described in clause 2(b) above.

d. Vesting of Stock Awards Granted to Independent Directors.

i. Initial Stock Awards granted hereunder shall vest in three (3) equal annual installments on each of the first three (3) anniversaries following the date of

grant, subject to the Independent Director’s continuing service on the Board through each such vesting date.

ii.Subsequent Stock Awards granted hereunder shall vest in full on the earlier of (A) the date of the annual meeting of the Company’s stockholders next

following the grant date (it being understood that the Subsequent Stock Awards shall vest on the date of such annual meeting whether or not the
Independent Director is re-elected at such meeting, so long as the Independent Director serves through such meeting) and (B) on the first anniversary
of the date of grant, subject to the Independent Director’s continuing service on the Board through each such vesting date.

2

iii.

Any stock awards granted hereunder shall vest in full in the event of a Change in Control or a Hostile Take-Over (each as defined in the 2002

Plan) to the extent the Independent Director is serving on the Board at the time of such transaction or in the event an Independent Director ceases to
serve on the Board by reason of death or Permanent Disability as defined in the 2002 Plan.

iv.

Any unvested stock awards will be forfeited to the Company in the event an Independent Director ceases to serve on the Board prior to the

vesting of such awards.

e. Effect of Termination of Board Service on Stock Options. An Independent Director shall be able to exercise his or her stock options that were vested at the time

of his or her cessation of Board service until the first to occur of (i) the third anniversary of the date of his or her cessation of Board service, or (ii) the original
expiration date of the term of such stock options.

f.

Term of Stock Options. Each stock option granted hereunder shall have a term of ten (10) years measured from the date of grant.

g. Exercise Price of Stock Options. The exercise price per share of any stock options granted hereunder shall be equal to one hundred percent (100%) of the Fair

Market Value (as defined in the 2002 Plan) of the common stock on the date of grant.

II. DIRECTOR STOCK OWNERSHIP GUIDELINES

Independent Directors are expected to own and hold shares of the Company’s common stock with a value equal to three times the annual cash retainer for service as
an Independent Director (without regard to any retainers paid for committee service or service as chairman of the Board). The stock ownership level should be achieved by each
Independent Director on or before April 30, 2014 or, if later, within three years after the Independent Director’s first appointment to the Board.

Stock that counts toward satisfaction of these guidelines include: shares of common stock owned outright by the Independent Director and his or her immediate

family members who share the same household, whether held individually or jointly; restricted stock where the restrictions have lapsed; shares acquired upon stock option
exercise; shares purchased in the open market; and shares held in trust for the benefit of the Independent Director or his or her family. Restricted stock units, which represent the
right to receive shares, do not count towards satisfaction of these guidelines. Shares held in trust may be included. Due to the complexities of trust accounts, requests to include
shares held in trust should be submitted to the Secretary of the Company and the Chairman of the Board will make the final decision as to whether to include those shares.

An Independent Director will be deemed to be in compliance with these guidelines if the Fair Market Value (as defined in the 2002 Plan) of the shares of the

Company’s common stock held by such Independent Director on any date prior to the deadline for his or her compliance equals or exceeds the required multiple of his or her
annual cash retainer. After meeting the requirements set forth in these guidelines, any subsequent decreases in the market value of the Company’s common stock shall not be
considered, so long as the Independent Director continues to hold at least the same number of shares of the Company’s common stock as he or she did when the guidelines were
first met or exceeded by such Independent Director.

The guidelines may be waived for Independent Directors, at the discretion of the Board, if compliance would create hardship or prevent an Independent Director

from complying with a court order, as in the case of a divorce settlement.

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Exhibit 10.14

SEPARATION AGREEMENT

This  Separation Agreement  (this  “ Agreement”)  is  made  by  and  between  Ligand  Pharmaceuticals  Incorporated  (the  “ Company”),  and  John
Higgins (“Executive”), effective as of the Effective Date (as defined below). The Company and Executive are sometimes collectively referred to herein
as the “Parties” and individually referred to as a “ Party.”

RECITALS
    WHEREAS, Executive is a party to that certain offer letter dated as of January 10, 2007, with the Company (the “ Offer Letter”), that certain change
in  control  severance  agreement  dated  as  of August  17,  2007,  with  the  Company  (the  “Change  in  Control  Severance Agreement”),  and  that  certain
proprietary information and inventions agreement dated as of January 16, 2007, with the Company (the “PIIA”);

WHEREAS,  Executive  was  employed  by  the  Company  until  December  5,  2022,  when  Executive’s  employment  terminated  (“ Termination

Date”);

WHEREAS, Executive has agreed to enter into a general release of claims in favor of the Company as a condition to receiving the Termination

Benefits (as defined below) described in this Agreement; and

WHEREAS,  the  Parties  wish  to  resolve  any  and  all  disputes,  claims,  complaints,  grievances,  charges,  actions,  petitions  and  demands  that
Executive may have against the Company and any of the Releasees (as defined below), including, but not limited to, any and all claims arising out of or
in any way related to Executive’s employment relationship with the Company and the termination of that relationship.

NOW  THEREFORE,  for  good  and  valuable  consideration,  including  the  mutual  promises  and  covenants  made  herein,  the  Company  and

Executive hereby agree as follows:

AGREEMENT

1 .    Termination.  Executive’s  employment  with  the  Company  will  terminate  on  the  Termination  Date.   The  Termination  Date  will  be  the
termination date of Executive’s employment with the Company and any of its affiliates for all purposes, including active participation in and coverage
under all benefit plans and programs sponsored by or through the Company and its affiliates, except as provided in this Agreement. Executive  hereby
confirms his resignation from all positions he holds with the Company and any of its affiliates, including his position as Chief Executive Officer of the
Company, effective as of the Termination Date.  In addition, Executive hereby irrevocably resigns as a member of the board of directors of the Company
(the “Board”), effective December 31, 2022. In the event Executive’s service as a member of the Board does not terminate effective December 31, 2022,
Executive shall not be eligible for any of the Termination Benefits hereunder, all of which shall be immediately forfeited. Executive shall execute any
additional documentation necessary to effectuate the foregoing.

2.    Payment of Salary and Receipt of All Benefits.

    (a)    Accrued Compensation. On the first regularly scheduled payroll date following the Termination Date (or such earlier time required by
applicable law), the Company will pay Executive all accrued but unpaid wages, including any accrued, unused vacation or paid time off, through the
Termination  Date. Executive  shall  receive  any  other  benefits  due  to  Executive  under  any  Company-provided  plans,  policies,  and  arrangements  in
accordance with such plans, policies or arrangement. Executive acknowledges and represents that, other than the consideration to be paid in accordance
with this Section 2 or Section 3 below, the Company has paid or provided all salary, wages, bonuses, accrued vacation/paid time off, premiums, leaves,
housing allowances, relocation costs, interest, severance, outplacement costs, fees, reimbursable expenses, commissions, draws, stock, stock options or
other equity awards (including restricted stock unit awards), vesting, and any and all other benefits and compensation due to Executive and that no other
reimbursements or compensation are owed to Executive, including

under the Company’s Amended and Restated Severance Plan (the “ Severance Plan”) and the Offer Letter.

    (b)    Expenses. The Company will reimburse Executive for any and all reasonable and necessary business expenses incurred by Executive in
connection with the performance of his job duties prior to the Termination Date in accordance with the Company’s policies, which expenses shall be
submitted to the Company with supporting receipts and/or documentation no later than thirty (30) days after the Termination Date.

    (c)     Benefits. Subject to Section 3 below, and except as otherwise required by applicable law, Executive’s entitlement to health benefits from
the Company, and eligibility to participate in the Company’s health benefit plans, shall cease on the last day of the calendar month during which the
Termination Date occurs, except to the extent Executive elects to and is eligible to receive continued healthcare coverage pursuant to the provisions of
the  Consolidated  Omnibus  Budget  Reconciliation  Act  of  1985,  as  amended  (“COBRA”),  for  himself  and  any  covered  dependents.  Executive’s
entitlement  to  other  benefits  from  the  Company,  and  eligibility  to  participate  in  the  Company’s  other  benefit  plans  and  programs,  shall  cease  on  the
Termination Date.

        (d)    Director Compensation.  Notwithstanding  anything  to  the  contrary  in  the  Company’s  Director  Compensation  and  Stock  Ownership

Policy, you will not be eligible for any compensation thereunder for the period commencing on the Termination Date and December 31, 2022.

3 .    Termination Benefits. In consideration for Executive’s agreement to be bound by the terms of this Agreement, including but not limited to
the  release  of  claims  in  Section  4,  but  subject  to  Executive’s  continued  compliance  with  the  terms  of  this  Agreement,  including  Section  9,  and
Executive’s resignation as a member of the Board effective December 31, 2022 in accordance with Section 1, the Company agrees to provide Executive
with the following termination benefits (the “Termination Benefits”):

    (a)    Severance. Subject to Sections 15(b) and (c), Executive shall be eligible to receive continued payment of Executive’s base salary at the
rate in effect on the Termination Date ($730,455.12 per year) for a period of eighteen (18) months following the Termination Date, in accordance with
the Company’s then-current payroll policies and practices. For the avoidance of doubt, Executive will not be entitled to any bonus, or pro-rated portion
thereof, for fiscal year 2022.

    (b)    Equity Vesting. Notwithstanding any language to the contrary set forth in any award agreements issued to Executive under Company’s
2002 Stock Incentive Plan, upon the later of (i) the Effective Date or (ii) January 1, 2023, for awards the vesting of which is solely time-based and not
subject to the satisfaction of a performance condition, the unvested portion of any such unvested stock option or restricted stock unit granted to Executive
shall vest. As of the later of (i) the Effective Date or (ii) January 1, 2023, all equity awards that are subject to the satisfaction of a performance condition
(including, without limitation, all performance stock units granted to Executive), shall vest at the “target” levels and any remaining portion of such award
not eligible to vest pursuant to this Section 3(b) shall terminate immediately upon the Termination Date. Executive’s equity awards as of the Termination
Date  are  set  forth  on Exhibit B.  For  the  avoidance  of  doubt,  the  foregoing  acceleration  pursuant  to  this  Section  3(b)  shall  only  apply  to  outstanding
awards issued by the Company and shall not apply to any awards issued to Executive by OmniAb, Inc. (including any such awards issued to Executive
by  OmniAb,  Inc.  upon  the  conversion  or  adjustment  of  Company  equity  awards  pursuant  to  that  certain Amended  and  Restated  Employee  Matters
Agreement (the “Employee Matters Agreement”), by and among the Company, OmniAb, Inc., Avista Public Acquisition Corp. II and Orwell Merger
Sub  Inc.,  dated  as  of August  18,  2022,  or  that  certain Agreement  and  Plan  of  Merger,  by  and  among  the  Company,  OmniAb,  Inc., Avista  Public
Acquisition Corp. II and Orwell Merger Sub Inc., a Delaware corporation, dated March 23, 2022) (together, the “OmniAb Awards ”),  which  OmniAb
Awards are not governed by the terms of this Agreement and shall instead be governed by the terms and conditions of the equity award agreements and
the equity plan under which such equity awards were granted and the Employee Matters Agreement (including any accelerated vesting thereof as a result
of Executive’s termination of employment with the Company and the accelerated vesting of his Company equity awards pursuant to this Section 3(b) in
accordance with the equity award agreements and the equity plan under which such

2

equity awards were granted and the Employee Matters Agreement). With respect to any tax withholding obligation arising in connection with the vesting
and settlement of the restricted stock units or performance stock units held by Executive, the vesting of which will accelerate pursuant to this Section
3(b),  such  tax  withholding  obligation  shall  be  automatically  satisfied  by  means  of  the  surrender  or  withholding  of  a  net  number  of  vested  shares  of
Company  common  stock  subject  to  such  awards  having  a  then  current  fair  market  value  not  exceeding  the  amount  necessary  to  satisfy  the  tax
withholding obligation of the Company based on the minimum applicable statutory withholding rates for federal, state and local income tax and payroll
tax purposes, in accordance with the terms of the Company’s 2002 Stock Incentive Plan pursuant to which such equity awards were granted. Except as
provided in Section 3(c), Executive’s vested Company equity awards shall be governed by the terms and conditions of the equity award agreements and
the Company’s 2002 Stock Incentive Plan under which such equity awards were granted.

        (c)    Extension  of  Post-Termination  Exercise  Period .  Notwithstanding  anything  to  the  contrary  contained  in  the  Company’s  2002  Stock

Incentive Plan and the equity award agreements under which Executive’s outstanding stock options were granted:

        (i)    Subject to the terms and conditions contained in, and Executive’s continued compliance with, this Section 3(c), the period of time
during which Executive may exercise his vested stock options following the Termination Date (after giving effect to the acceleration pursuant to Section
3(b) above) shall be extended to the earliest of (A) the second anniversary of the Termination Date or (B) the original ten-year expiration date of such
options (the “Exercise Period Extension”).

            (ii)    It shall be a condition to the Exercise Period Extension that Executive not sell, pledge, assign, hypothecate, transfer, or otherwise dispose of
(collectively,  “Transfer”)  on  any  single  trading  day  occurring  during  the  period  commencing  on  the  Termination  Date  and  ending  on  the  second
anniversary of the Termination Date, shares of the Company’s common stock (including shares issuable upon vesting, settlement or exercise of stock
options, restricted stock units or performance stock units) in an amount that is in excess of five percent (5%) of the average daily trading volume of the
Company’s common stock for the preceding calendar week, other than Permitted Transfers.  For purposes of this Agreement, a “Permitted  Transfer”
will  include  (A)  the  Transfer  of  any  or  all  of  the  shares  during  Executive’s  lifetime  or  upon  Executive’s  death  by  will  or  intestacy  to  Executive’s
Immediate Family or a trust for the benefit of Executive’s Immediate Family (provided that such Immediate Family or trust agrees to be bound by the
restrictions in this Section 3(c)), (B) any Transfer upon the occurrence of, and in connection with, a change in control of the Company, (C) any Transfer
approved in writing by the Board, (D) any Transfer pursuant to the written trading plan adopted by the Executive on September 22, 2022, in accordance
with Rule 10b5-1, or (E) any Transfer to the Company in connection with tax withholding by the Company as described in Section 3(b) above. As used
herein, “Immediate Family” shall mean Executive’s spouse, lineal descendant or antecedent, father, mother, brother or sister or stepchild (whether or not
adopted).

            (iii)    It shall be a further condition to the Exercise Period Extension that Executive not Transfer any of the shares of the Company’s common
stock currently held by Executive in a brokerage account at Morgan Stanley or E*Trade (or any shares issuable upon vesting, settlement or exercise of
stock  options  or  restricted  stock  units  after  the  Termination  Date)  to  another  account  without  the  prior  written  consent  of  the  Company.  Executive
acknowledges and agrees that the Company may place restrictions on any such brokerage account to ensure Executive’s compliance with the restrictions
in this Section 3(c).

                (iv)        In  the  event  Executive  breaches  this  Section  3(c)  or  Section  9,  Executive’s  ability  to  exercise  his  vested  stock  options  shall

immediately cease and all of Executive’s vested stock options shall cease to be exercisable on the date of such breach and shall be forfeited.

        (v)    Executive acknowledges that, as a result of the foregoing Exercise Period Extension, any outstanding stock option classified as an
“incentive stock option” under Section 422 of the Internal Revenue Code of 1986, as amended (the “Code”), may be immediately reclassified as a non-
qualified stock option, and that Executive, and not the Company, shall be solely responsible for any tax

3

consequences relating to such reclassification (including as a result of any loss of incentive stock option treatment with respect to any outstanding stock
options).

        (vi)    For the avoidance of doubt, the Exercise Period Extension shall only apply to outstanding awards issued by the Company and shall
not  apply  to  any  OmniAb  Awards,  which  OmniAb  Awards  are  not  governed  by  this  Agreement  and  shall  instead  be  governed  by  the  terms  and
conditions of the equity award agreements and the equity plan under which such equity awards were granted and the Employee Matters Agreement.

        (d)    Continuation Coverage.  If Executive elects continuation coverage pursuant to COBRA within the time period prescribed pursuant to
COBRA for Executive and Executive’s eligible dependents, then the Company will reimburse Executive for the COBRA premiums for such coverage
(at  the  coverage  levels  in  effect  immediately  prior  to  Executive’s  termination)  until  the  earlier  of  (i)  a  period  of  eighteen  (18)  months  from  the
Termination Date or (ii) the date upon which Executive becomes covered under similar plans of a subsequent employer.  The reimbursements will be
made  by  the  Company  to  Executive  consistent  with  the  Company’s  normal  expense  reimbursement  policy.  Notwithstanding  the  first  sentence  of  this
Section 3(d), if the Company determines in its sole discretion that it cannot provide the foregoing benefit without potentially violating, or being subject
to an excise tax under, applicable law (including, without limitation, Section 2716 of the Public Health Service Act), the Company will in lieu thereof
provide to Executive a taxable monthly payment, payable on the last day of a given month, in an amount equal to the monthly COBRA premium that
Executive would be required to pay to continue Executive’s group health coverage in effect on the termination of employment date (which amount will
be  based  on  the  premium  for  the  first  month  of  COBRA  coverage),  which  payments  will  be  made  regardless  of  whether  Executive  elects  COBRA
continuation coverage and will commence on the month following Executive’s termination of employment and will end on the earlier of (x) the date
upon  which  Executive  obtains  other  employment  or  (y)  the  date  the  Company  has  paid  an  amount  equal  to  eighteen  (18)  such  payments. For  the
avoidance of doubt, the taxable payments in lieu of COBRA reimbursements may be used for any purpose, including, but not limited to continuation
coverage under COBRA, and will be subject to all applicable tax withholdings.

4 .    Release of Claims. Executive agrees that the consideration to be paid in accordance with Section 3 of this Agreement represents settlement
in  full  of  all  outstanding  obligations  owed  to  Executive  by  the  Company  and  its  current  and  former  officers,  directors,  employees,  agents,  investors,
attorneys, stockholders, administrators, affiliates, benefit plans, plan administrators, insurers, trustees, divisions, and subsidiaries, and predecessor and
successor corporations and assigns (collectively, the “Releasees”). Executive, on Executive’s own behalf and on behalf of Executive’s respective heirs,
family members, executors, agents, and assigns, hereby and forever releases the Releasees from, and agrees not to sue concerning, or in any manner to
institute, prosecute, or pursue, any claim, complaint, charge, duty, obligation, demand, or cause of action relating to any matters of any kind, whether
presently known or unknown, suspected or unsuspected, that Executive may possess against any of the Releasees arising from any omissions, acts, facts,
or damages that have occurred up until and including the date of Executive’s execution of this Agreement, including, without limitation the following:

(a)    any and all claims relating to or arising from Executive’s employment relationship with the Company and the termination of that

relationship;

(b)    any and all claims relating to, or arising from, Executive’s right to purchase, or actual purchase of shares of stock of the Company,
including, without limitation, any claims for fraud, misrepresentation, breach of fiduciary duty, breach of duty under applicable state corporate law, and
securities fraud under any state or federal law;

(c) any  and  all  claims  for  wrongful  discharge  of  employment;  termination  in  violation  of  public  policy;  discrimination;  harassment;
retaliation;  breach  of  contract,  both  express  and  implied;  breach  of  covenant  of  good  faith  and  fair  dealing,  both  express  and  implied;  promissory
estoppel; negligent or intentional infliction of emotional distress; fraud; negligent or intentional misrepresentation; negligent or intentional interference
with  contract  or  prospective  economic  advantage;  unfair  business  practices;  defamation;  libel;  slander;  negligence;  personal  injury;  assault;  battery;
invasion of privacy; false imprisonment; conversion; and disability benefits;

4

(d)    any and all claims for violation of any federal, state, or municipal statute, including, but not limited to, Title VII of the Civil Rights
Act of 1964; the Civil Rights Act of 1991; the Rehabilitation Act of 1973; the Americans with Disabilities Act of 1990; the Equal Pay Act; the Fair
Labor Standards Act; the Fair Credit Reporting Act; the Age Discrimination in Employment Act of 1967; the Older Workers Benefit Protection Act; the
Employee Retirement Income Security Act of 1974; the Worker Adjustment and Retraining Notification Act; the Family and Medical Leave Act; the
Sarbanes-Oxley Act of 2002; the California Fair Employment and Housing Act, as amended, Cal. Lab. Code § 12940  et seq.; the California Equal Pay
Law, as amended, Cal. Lab. Code §§ 1197.5(a),1199.5; the Moore-Brown-Roberti Family Rights Act of 1991, as amended, Cal. Gov’t Code §§ 12945.2,
19702.3;  the  California  Labor  Code;  the  California  Business  &  Professions  Code;  the  California  WARN  Act,  Cal.  Lab.  Code  §  1400  et  seq.;  the
California  False  Claims  Act,  Cal.  Gov’t  Code  §  12650 et  seq.;  and  the  California  Corporate  Criminal  Liability  Act,  Cal.  Penal  Code  §  387;   the
Minnesota  Human  Rights  Act,  Minn.  Stat.  Ann.  §§  363A.01  to  363A.50;  the  Minnesota  Equal  Pay  for  Equal  Work  Law,  Minn.  Stat.  Ann.  §§
181.66 to 181.71; Minnesota’s age discrimination statute, Minn. Stat. Ann. § 181.81; Retaliatory discharge related to workers' compensation, Minn. Stat.
Ann. § 176.82, subdiv. 1; Minnesota’s whistleblower protection statutes, Minn. Stat. Ann. §§ 181.932 and 181.935; Minnesota’s family leave statute,
Minn. Stat. Ann. §§ 181.940 to 181.944; Minnesota’s personnel record access statutes, Minn. Stat. Ann. §§ 181.960 to 181.967;

        (e) any and all claims for violation of the federal, or any state, constitution;

(f) any and all claims arising out of any other laws and regulations relating to employment or employment discrimination;
(g) any claim for any loss, cost, damage, or expense arising out of any dispute over the non-withholding or other tax treatment of any of

the proceeds received by Executive as a result of this Agreement; and

(h) any and all claims for attorneys’ fees and costs.

    Executive agrees that the release set forth in this Section 4 (the “ Release”) will be and remain in effect in all respects as a complete general release as
to the matters released. The Release does not release claims that cannot be released as a matter of law. Executive represents that Executive has made no
assignment  or  transfer  of  any  right,  claim,  complaint,  charge,  duty,  obligation,  demand,  cause  of  action,  or  other  matter  waived  or  released  by  this
Section  4.  Nothing  in  this Agreement  waives  (i)  Executive’s  rights  to  indemnification  or  any  payments  under  any  fiduciary  insurance  policy,  if  any,
provided by any act or agreement of the Company, state or federal law or policy of insurance, or any other indemnification rights to which Executive
may be entitled under the Company’s Certificate of Incorporation or Bylaws, by contract, as a matter of law, or otherwise, or under any power that the
Company may have to indemnify Executive or hold Executive harmless; (ii) any vested rights Executive may have under the employee benefit plans,
programs, or policies of the Company and its affiliates; (iii) Executive’s right to enforce the terms of this Agreement; and (iv) any right that may not be
waived by private agreement.

5.    Acknowledgment of Waiver of Claims under ADEA . Executive acknowledges that Executive is waiving and releasing any rights Executive
may have under the Age Discrimination in Employment Act of 1967 (“ ADEA”) and that this waiver and release is knowing and voluntary. Executive
agrees that this waiver and release does not apply to any rights or claims that may arise under the ADEA after the date on which Executive executes this
Agreement.  Executive  acknowledges  that  the  consideration  given  for  this  waiver  and  release Agreement  is  in  addition  to  anything  of  value  to  which
Executive was already entitled. Executive further acknowledges that Executive is hereby advised by this writing that (a) Executive should consult with
an attorney prior to executing this Agreement; (b) Executive has at least twenty-one (21) days within which to consider this Agreement; (c) Executive
has seven (7) days following the execution of this Agreement by the Parties to revoke the Agreement; (d) this Agreement will not be effective until the
revocation period has expired; and (e) nothing in this Agreement prevents or precludes Executive from challenging or seeking a determination in good
faith  of  the  validity  of  this  waiver  under  the ADEA,  nor  does  it  impose  any  condition  precedent,  penalties  or  costs  for  doing  so,  unless  specifically
authorized by federal law. In the event Executive signs this Agreement and delivers

5

it  to  the  Company  in  less  than  the  twenty-one  (21)-day  period  identified  above,  Executive  hereby  acknowledges  that  Executive  has  freely  and
voluntarily chosen to waive the time period allotted for considering this Agreement. Executive acknowledges and understands that revocation must be
accomplished by a written notification to the Chief Legal Officer of the Company that is received prior to the Effective Date.

6.    Unknown Claims. Executive acknowledges that Executive has been advised to consult with legal counsel and is familiar with the provisions

of California Civil Code Section 1542, a statute that otherwise prohibits the release of unknown claims, which provides as follows:

A  GENERAL  RELEASE  DOES  NOT  EXTEND  TO  CLAIMS  WHICH  THE  CREDITOR  OR  RELEASING  PARTY
DOES  NOT  KNOW  OR  SUSPECT  TO  EXIST  IN  HIS  OR  HER  FAVOR  AT  THE  TIME  OF  EXECUTING  THE
RELEASE,  THAT  IF  KNOWN  BY  HIM  OR  HER  WOULD  HAVE  MATERIALLY  AFFECTED  HIS  OR  HER
SETTLEMENT WITH THE DEBTOR OR RELEASED PARTY.

    Executive, being aware of California Civil Code Section 1542, agrees to expressly waive any rights Executive may have thereunder, as well as under
any other statute or common law principles of similar effect.

7.    No Pending or Future Lawsuits. Executive represents that Executive has no lawsuits, claims, or actions pending in Executive’s name, or on
behalf of any other person or entity, against the Company or any of the other Releasees. Executive also represents that Executive does not intend to bring
any claims on Executive’s own behalf or on behalf of any other person or entity against the Company or any of the other Releasees. Executive confirms
that Executive has no knowledge of any wrongdoing involving improper or false claims against a federal or state governmental agency, or any other
wrongdoing that involves Executive or any other present or former Company employees, including violations of the federal and state securities laws.

8 .    Sufficiency of Consideration. Executive hereby acknowledges and agrees that Executive has received good and sufficient consideration for

every promise, duty, release, obligation, agreement and right contained in this Agreement and the Release contained in Section 4.

9. Restrictive Covenants.

        (a)    Confidential Information.  Executive  reaffirms  and  agrees  to  observe  and  abide  by  the  terms  of  the  PIIA,  specifically  including  the
provisions therein regarding nondisclosure of the Company’s trade secrets and confidential and proprietary information, which agreement will continue
in force and agrees that such obligations shall survive the Termination Date.

        (b)     Solicitation of Employees and Independent Contractors. For one (1) year following the Termination Date, Executive will not, either
directly  or  through  others,  solicit  or  attempt  to  solicit  any  employee,  independent  contractor  or  consultant  of  the  Company  to  terminate  his  or  her
relationship with the Company in order to become an employee, consultant or independent contractor to or for any other person or entity, or otherwise
encourage or solicit any employee of the Company to leave the Company for any reason or to devote less than all of any such employee’s efforts to the
affairs of the Company.

        (c)    Return of Company Property; Passwords and Password-protected Documents. Executive confirms that Executive has returned to the
Company in good working order all keys, files, records (and copies thereof), equipment (including, but not limited to, computer hardware, software and
printers, wireless handheld devices, cellular phones and pagers), access or credit cards, Company identification, and any other Company-owned property
in Executive’s possession or control, provided that Executive may retain his personal copies of (i) his compensation records, (ii) materials distributed to
stockholders  generally  and  (iii)  any  written  agreement  to  which  Executive  is  a  party.  Executive  further  confirms  that  Executive  has  cancelled  all
accounts for Executive’s benefit, if any, in the Company’s name, including, but not limited to, credit cards, telephone charge cards, cellular phone and/or
pager

6

accounts and computer accounts; provided, however, that Executive shall be permitted to retain his Company-provided laptop until December 31, 2022
in  order  to  coordinate  the  transition  of  his  personal  files  and  emails  from  such  laptop,  subject  to  Executive’s  cooperation  with  the  Company’s
information technology department in such transition. The Company shall keep Executive’s Company email active through December 31, 2022, or such
later  date  as  mutually  agreed  with  the  Company;  provided  that  Executive  will  immediately  forward  any  work-related  emails  that  he  receives  at  his
Company email address to the Chief Executive Officer of the Company. Executive also confirms that Executive has delivered all passwords in use by
Executive  at  the  time  of  Executive’s  termination,  a  list  of  any  documents  that  Executive  created  or  of  which  Executive  is  otherwise  aware  that  are
password-protected, along with the password(s) necessary to access such password-protected documents.

    (d)    Nondisparagement. Subject to Section 11 of this Agreement, Executive agrees that Executive will not make any negative or disparaging
statements  or  comments,  either  as  fact  or  as  opinion,  about  Company,  its  employees,  officers,  directors,  shareholders,  vendors,  products  or  services,
business, technologies, market position or performance. The Company agrees that it shall not, and shall cause its directors and executive officers not to,
make  any  negative  or  disparaging  statements  or  comments,  either  as  fact  or  as  opinion,  about  Executive. Nothing  in  this  paragraph  will  prohibit
Executive or the Company from providing truthful information in response to a subpoena or other legal process.     

        (e)    Reformation of Provisions. If it is determined by a court of competent jurisdiction in any state that any restriction in this Section 9 is
excessive in duration or scope or is unreasonable or unenforceable under the laws of that state, it is the intention of the parties that such restriction may
be modified or amended by the court to render it enforceable to the maximum extent permitted by the law of that state.

    (f)    Remedies. It is expressly agreed that the Company and its subsidiaries and affiliates will or would suffer irreparable injury if Executive
were to breach any of the provisions of this Section 9 and that the Company and its subsidiaries and affiliates would by reason of any such breach be
entitled to injunctive relief in a court of competent jurisdiction without the need to post a bond or other security and without the need to demonstrate
special  damages. The aforementioned injunctive relief is and shall be in addition to any other remedies that may be available to the Company and its
subsidiaries  and  affiliates  under  this Agreement  or  otherwise. In  addition  to  all  other  rights  and  remedies  available  to  the  Company  under  law  or  in
equity, the Company shall be entitled to withhold all Termination Benefits from Executive in the event of his breach of this Section 9.

10.    No Cooperation. Subject to Section 11 of this Agreement, Executive agrees that Executive will not knowingly encourage, counsel, or assist
any attorneys or their clients in the presentation or prosecution of any disputes, differences, grievances, claims, charges, or complaints by any third party
against  any  of  the  Releasees,  unless  under  a  subpoena  or  other  court  order  to  do  so  or  as  related  directly  to  the ADEA  waiver  in  this Agreement.
Executive agrees both to immediately notify the Company upon receipt of any such subpoena or court order, and to furnish, within three (3) business
days of its receipt, a copy of such subpoena or other court order. If approached by anyone for counsel or assistance in the presentation or prosecution of
any  disputes,  differences,  grievances,  claims,  charges,  or  complaints  against  any  of  the  Releasees,  Executive  will  state  no  more  than  that  Executive
cannot provide any such counsel or assistance.

11 .    Protected Activities. Notwithstanding anything herein to the contrary, nothing in this Agreement or the PIIA shall (a) prohibit Executive
from  filing  a  charge  with  the  Equal  Employment  Opportunity  Commission,  the  National  Labor  Relations  Board,  the  Occupational  Safety  and  Health
Administration,  the  Securities  and  Exchange  Commission  or  any  other  comparable  federal  agency,  state  agency  or  securities  regulatory  body  (the
“Government Agencies ”);  (b)  prohibit  Executive  from  reporting  possible  violations  of  law  to  an  appropriate  Government Agency  in  a  confidential
manner  without  notice  to  the  Company  as  authorized  in  any  whistleblower  protection  provisions  of  any  federal  or  state  law  or  regulation;  (c)
communicating  directly  with  any  governmental,  law  enforcement,  regulatory  or  self-regulatory  body;  (d)  limit  Executive’s  lawful  opportunity  to
cooperate with or participate in any administrative proceeding or investigation that may be conducted by a Government Agency; (e) receive awards from
a Government Agency as a result of reporting or cooperation; or (f) discussing or disclosing

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information  about  unlawful  acts  in  the  workplace,  such  as  harassment  or  discrimination  or  any  other  conduct  that  Executive  has  reason  to  believe  is
unlawful.  With  respect  to  any  information  disclosed  pursuant  to  this  protected  activity  exception  that  may  constitute  confidential  or  proprietary
information,  Executive  agrees  to  take  all  reasonable  precautions  to  prevent  any  unauthorized  use  or  disclosure  to  any  parties  other  than  the  relevant
agency  or  authority.  Except  as  prohibited  by  applicable  law,  rule,  or  regulation,  the  payments  paid  to  pursuant  to  this Agreement  will  be  the  sole
monetary relief available to Executive, and Executive will not be entitled to recover, and agrees to waive, any additional personal monetary relief that
may be sought from or awarded against the Company in the future without regard to who filed or brought such claim. However, this Agreement does not
waive Executive’s right to receive an award for original information from any Government Agency, including but not limited to any such award pursuant
to  Section  21F  of  the  Securities  Exchange  Act  of  1934.  Further,  Executive’s  participation  in  an  investigation  or  other  legal  matter  may  include  a
disclosure of trade secret information provided that it must comply with the restrictions in the Defend Trade Secrets Act of 2016 (“ DTSA”). The DTSA
provides that no individual will be held criminally or civilly liable under Federal or State trade secret law for the disclosure of a trade secret that: (i) is
made in confidence to a Federal, State, or local government official, either directly or indirectly, or to an attorney; and made solely for the purpose of
reporting or investigating a suspected violation of law; or, (ii) is made in a complaint or other document if such filing is under seal so that it is not made
public. Also, an individual who pursues a lawsuit for retaliation by an employer for reporting a suspected violation of the law may disclose the trade
secret to the attorney of the individual and use the trade secret information in the court proceeding, if the individual files any document containing the
trade secret under seal, and does not disclose the trade secret, except as permitted by court order.

12.    No Admission of Liability. Executive understands and acknowledges that this Agreement constitutes a compromise and settlement of any
and all actual or potential disputed claims by Executive. No action taken by the Company hereto, either previously or in connection with this Agreement,
will be deemed or construed to be (a) an admission of the truth or falsity of any actual or potential claims or (b) an acknowledgment or admission by the
Company of any fault or liability whatsoever to Executive or to any third party.

1 3 . Costs.  The  Parties  will  each  bear  their  own  costs,  attorneys’  fees  and  other  fees  incurred  in  connection  with  the  preparation  of  this

Agreement.

14. Arbitration.

        (a)    Agreement to Arbitrate .  The Company and Executive hereby agree to resolve by final and binding arbitration any and all claims or
controversies  in  any  way  arising  out  of,  relating  to  or  associated  with  Executive’s  employment  with  the  Company  or  any  of  its  parents,  affiliates,  or
subsidiaries, or the termination of such employment or any breach of this Agreement. This mutual agreement to arbitrate includes any claims that the
Company  may  have  against  Executive,  or  that  Executive  may  have  against  the  Company  or  against  any  of  its  officers,  directors,  employees,  agents,
successors, or parent, subsidiary, or affiliated entities so long as such claim is related to Executive’s employment with the Company. The Company and
Executive agree that arbitration, as provided for in this Agreement, shall be the exclusive forum for the resolution of any covered dispute between the
Parties.  The  Company  and  Executive  agree  that  their  mutual  agreement  to  arbitrate  shall  constitute  sufficient  consideration  by  each  Party  for  the
promises made in this Section 14.

    (b)    Scope of Agreement. The claims covered by this Section 14 include, but are not limited to, claims for breach of any contract or covenant,
express  or  implied;  claims  for  breach  of  any  fiduciary  duty  or  other  duty  owed  to  Executive  by  Company  or  to  Company  by  Executive;  tort  claims;
claims for wages or other compensation due; claims for discrimination or harassment, including but not limited to discrimination or harassment based on
race, sex, pregnancy, religion, national origin, ancestry, age, marital status, physical disability, mental disability, medical condition, or sexual orientation;
and claims for violation of any federal, state or other governmental constitution, statute, ordinance or regulation (as originally enacted and as amended),
including but not limited to claims under Title VII of the Civil Rights Act of 1964 (“ Title VII”), the Fair Labor Standards Act, the Employee Retirement
Income Security Act, the Consolidated Omnibus Budget Reconciliation Act (“COBRA”), and the Family and Medical Leave Act .

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        (c)    Procedure.    Executive’s  request  to  arbitrate  must  be  directed  to  the  Board  at  the  Company’s  principal  place  of  business. A  request
submitted by the Company shall be sent to the Executive at the Executive’s address as reflected on the Company’s personnel records. Any arbitration
shall be conducted before a single arbitrator of JAMS under the Employment Arbitration Rules and Procedures (the “Rules”) of JAMS then in effect.
Executive can obtain a copy of the Rules on the website of JAMS, which is www.jamsadr.com and a copy will be provided to Executive upon request.
JAMS has previously maintained the Rules at this URL: http://www.jamsadr.com/rules-employment-arbitration. The arbitration will be conducted in San
Diego, California, and Executive and the Company consent to jurisdiction in California and venue in San Diego, California. If Executive is making a
claim, the Company will pay any arbitration filing fee in excess of the amount Executive would have been required to pay (if any) to file the claim in
court, and the Company will pay all of the arbitrator’s fees and other arbitration expenses. If the Company is making a claim, the Company will pay all
filing  fees  and  all  expenses  of  the  arbitration,  including  the  arbitrator’s  fees.  Each  Party  shall  bear  its,  his,  or  her  own  costs  of  legal  representation;
provided, however, if any Party prevails on a claim entitling the prevailing Party to attorneys’ fees and/or costs, the arbitrator may award reasonable fees
and/or costs to the prevailing Party in accordance with such claim. The arbitrator shall have the authority to order such discovery by way of deposition,
interrogatory, document production, or otherwise, as the arbitrator considers necessary to a full and fair exploration of the issues in dispute, consistent
with  the  expedited  nature  of  arbitration.  The  arbitrator  shall  issue  a  written  decision  that  reveals  the  essential  findings  and  conclusions  on  which  the
decision is based, and the arbitrator’s decision shall be subject to such judicial review as is provided by law. The mutual agreement to arbitrate claims as
set forth in this Section 14 is enforceable under and governed by the Federal Arbitration Act, 9 U.S.C. § 1 et seq. (the “ FAA”), but if the FAA is held not
to apply to this Agreement for any reason, this mutual agreement to arbitrate claims shall be enforced under the laws of the State of California.

        (d)    Administrative  Relief.    This  Section  14  does  not  limit  Executive’s  right  to  file  an  administrative  charge  with  the  National  Labor
Relations Board, the Equal Employment Opportunity Commission, or any state agency charged with enforcement of fair employment practice laws, but
Executive agrees to arbitrate under this Agreement all rights to any form of recovery or relief, including monetary or other damages. This agreement also
does not apply to or cover claims for workers’ compensation benefits or compensation, claims for unemployment compensation benefits, or claims based
upon an employee pension or benefit plan the terms of which contain an arbitration or other non-judicial dispute resolution procedure, in which case the
provisions of such plan shall apply.

        (e)    Voluntary  Nature  of Agreement .    Executive  acknowledges  and  agrees  that  Executive  is  executing  this Agreement  voluntarily  and
without any duress or undue influence by the Company or anyone else.  Executive further acknowledges and agrees that Executive has carefully read
this Agreement  and  that  Executive  has  asked  any  questions  needed  for  Executive  to  understand  the  terms,  consequences  and  binding  effect  of  this
Section 14 of this Agreement and fully understands it, including that EXECUTIVE EXPLICITLY WAIVES THE RIGHT TO TRIAL BY JURY  of
any claim subject to arbitration. The parties agree that any claim asserted in arbitration may be made only on an individual basis, and the parties may not
assert claims on a representative, class or other collective basis. Finally, Executive agrees that Executive has been provided an opportunity to seek the
advice of an attorney of Executive’s choice before signing this Agreement.

15.    Section 409A.

    (a)    Notwithstanding anything to the contrary in this Agreement, no severance pay or benefits to be paid or provided to Executive, if any,
pursuant  to  this  Agreement  that,  when  considered  together  with  any  other  severance  payments  or  separation  benefits,  are  considered  deferred
compensation subject to and not exempt from Section 409A of the Code, and the final regulations and any guidance promulgated thereunder (“Section
409A”) (together, the “ Deferred Payments”) will be paid or otherwise provided until Executive has a “separation from service” within the meaning of
Section 409A. The Company and Executive acknowledge and agree that the Termination Date will be the date of Executive’s “separation from service”
within the meaning of Section 409A.

9

    (b)    Any severance payments or benefits under this Agreement will be paid on, or, in the case of installments, will not commence until, the
date that is sixty (60) days following the Termination Date, or, if later, such time as required by Section 15(c). Except as required by Section 15(c), any
installment payments that would have been made to Executive during the period immediately following Executive’s separation from service but for the
preceding sentence will be paid to Executive with the initial installment commencing with the date that is sixty (60) days following the Termination Date
and the remaining payments will be made as provided in this Agreement. In any case where Executive’s separation from service and the last day of the
period  during  which  Executive  may  deliver  this Agreement  fall  in  two  separate  calendar  years,  any  amount  required  to  be  paid  to  Executive  that  is
conditioned on the effectiveness of the Release and is treated as a Deferred Payment shall be paid in the later calendar year.

    (c)    Notwithstanding anything to the contrary in this Agreement, if Executive is a “specified employee” within the meaning of Section 409A
on the Termination Date, then the Deferred Payments that are payable within the first six (6) months following Executive’s separation from service will
become payable on the first payroll date that occurs on or after the date six (6) months and one (1) day following the date of Executive’s separation from
service. All  subsequent  Deferred  Payments,  if  any,  will  be  payable  in  accordance  with  the  payment  schedule  applicable  to  each  payment  or  benefit.
Notwithstanding  anything  herein  to  the  contrary,  if  Executive  dies  following  Executive’s  separation  from  service,  but  before  the  six  (6)  month
anniversary of the separation from service, then any payments delayed in accordance with this Section 15(c) will be payable in a lump sum as soon as
administratively practicable after the date of Executive’s death and all other Deferred Payments will be payable in accordance with the payment schedule
applicable  to  each  payment  or  benefit. Each  payment  and  benefit  payable  under  this Agreement  is  intended  to  constitute  a  separate  payment  under
Section 1.409A-2(b)(2) of the Treasury Regulations. The Company has determined that the severance payments payable to Executive pursuant to Section
3(a) are Deferred Payments subject to delay pursuant to this Section 15(c); accordingly, the foregoing delay shall apply to such payments.

    (d)    Any reimbursement of expenses or in-kind benefits payable under this Agreement shall be made in accordance with Treasury Regulation
Section 1.409A-3(i)(1)(iv) and shall be paid on or before the last day of Executive’s taxable year following the taxable year in which Executive incurred
the expenses. The amount of expenses reimbursed or in-kind benefits payable in one year shall not affect the amount eligible for reimbursement or in-
kind  benefits  payable  in  any  other  taxable  year  of  Executive’s,  and  Executive’s  right  to  reimbursement  for  such  amounts  shall  not  be  subject  to
liquidation or exchange for any other benefit.

    (e)    The foregoing provisions are intended to comply with the requirements of Section 409A so that none of the severance payments and
benefits to be provided hereunder will be subject to the additional tax imposed under Section 409A, and any ambiguities herein will be interpreted to so
comply.  The  Company  and  Executive  agree  to  work  together  in  good  faith  to  consider  amendments  to  this Agreement  and  to  take  such  reasonable
actions which are necessary, appropriate or desirable to avoid imposition of any additional tax or income recognition before actual payment to Executive
under  Section  409A.  Notwithstanding  any  other  provision  of  this Agreement, the  Company  makes  no  representation  or  warranty  and  shall  have  no
liability to Executive or to any other person if any provisions of this Agreement are determined to constitute deferred compensation subject to Section
409A but do not satisfy an exemption from, or the conditions of, that section.

16. Authority. The Company represents and warrants that the undersigned has the authority to act on behalf of the Company and to bind the
Company and all who may claim through it to the terms and conditions of this Agreement. Executive represents and warrants that Executive has the
capacity  to  act  on  Executive’s  own  behalf  and  on  behalf  of  all  who  might  claim  through  Executive  to  bind  them  to  the  terms  and  conditions  of  this
Agreement. Each Party warrants and represents that there are no liens or claims of lien or assignments in law or equity or otherwise of or against any of
the claims or causes of action released herein.

17. No Representations.  Executive  represents  that  Executive  has  had  the  opportunity  to  consult  with  an  attorney,  and  has  carefully  read  and

understands the scope and effect of the provisions of

10

this Agreement. Executive has relied upon any representations or statements made by the Company that are not specifically set forth in this Agreement.

18. Severability. In the event that any provision or any portion of any provision hereof or any surviving agreement made a part hereof becomes or
is declared by a court of competent jurisdiction or arbitrator to be illegal, unenforceable, or void, this Agreement will continue in full force and effect
without said provision or portion of provision.

19.      Entire Agreement . This Agreement represents the entire agreement and understanding between the Company and Executive concerning
the subject matter of this Agreement and Executive’s employment with and separation from the Company and the events leading thereto and associated
therewith, and supersedes and replaces any and all prior agreements and understandings concerning the subject matter of this Agreement and Executive’s
relationship  with  the  Company,  including,  without  limitation,  the  Severance  Plan,  the  Offer  Letter  and  the  Change  in  Control  Severance Agreement;
provided,  however,  that  the  PIIA  and  any  of  Executive’s  written  equity  compensation  agreements  with  the  Company  are  not  superseded  by  this
Agreement.

20.     No Oral Modification. This Agreement may only be amended in writing signed by Executive and a member of the Board.
2 1 .    Governing  Law;  Venue .  This  Agreement  will  be  governed  by  the  laws  of  the  State  of  California,  without  regard  for  choice-of-law
provisions.  Executive  consents  to  personal  and  exclusive  jurisdiction  and  venue  in  the  State  of  California. Any  claims  or  legal  actions  by  one  Party
against  the  other  arising  out  of  the  relationship  between  the  Parties  contemplated  herein  (whether  or  not  arising  under  this  Agreement)  will  be
commenced or maintained in any state or federal court located in San Diego County, California, and Executive and the Company hereby submit to the
jurisdiction and venue of any such court.

22. Effective Date. Executive understands that this Agreement will be null and void if not executed by Executive no later the end of the twenty-
st
first (21 ) calendar day after the Agreement is provided to Executive for consideration. Executive has seven (7) days after he signs this Agreement to
revoke it. This Agreement will become effective on the eighth (8 ) day after Executive signs this Agreement, so long as it has been signed by the Parties
and has not been revoked by Executive before that date (the “Effective Date”). Executive acknowledges and agrees that he will not be eligible for any of
the Termination Benefits unless the Effective Date occurs within thirty (30) days following the Termination Date.  The Parties agree that any material or
immaterial changes to this Agreement shall not extend the deadline for the occurrence of the Effective Date.

th

23.    Withholding. All payments made pursuant to this Agreement will be subject to withholding of applicable income, employment and other

taxes.

2 4 .     Counterparts. This Agreement may be executed in counterparts and by facsimile, and each counterpart and facsimile will have the same

force and effect as an original and will constitute an effective, binding agreement on the part of each of the undersigned.

    25.    Notices. All notices or other communications required or permitted to be given under this Agreement shall be in writing and shall be deemed to
have been duly given when delivered personally or one (1) business day after being sent by a nationally recognized overnight delivery service, charges
prepaid.  Notices  also  may  be  given  electronically  via  PDF  and  shall  be  effective  on  the  date  transmitted  if  confirmed  within  forty-eight  (48)  hours
thereafter by a signed original sent in the manner provided in the preceding sentence. Notice to Executive shall be sent to his most recent residence and
personal email address on file with the Company. Notice to the Company shall be sent to its principal executive office and addressed to the Chief Legal
Officer at the email address provided by the Company for such person.

    26.    Voluntary Execution of Agreement. Executive understands and agrees that Executive executed this Agreement voluntarily, without any duress or
undue influence on the part or behalf of the

11

Company or any third party, with the full intent of releasing all of Executive’s claims against the Company and any of the other Releasees. Executive
expressly acknowledges that:

(a) Executive has read this Agreement;
(b) Executive has been represented in the preparation, negotiation, and execution of this Agreement by legal counsel of Executive’s own

choice or has elected not to retain legal counsel;

(c) Executive understands the terms and consequences of this Agreement and of the releases it contains; and
(d) Executive is fully aware of the legal and binding effect of this Agreement.

* * * * *

[Signature page to follow]

12

IN WITNESS WHEREOF, the Parties have executed this Agreement on the respective dates set forth below.

COMPANY

LIGAND PHARMACEUTICALS INCORPORATED

By:
Name:

Title:

/s/ Andrew T. Reardon

Andrew T. Reardon
Chief Legal Officer and Secretary

Dated:

December 4, 2022

EXECUTIVE

John Higgins, an individual

/s/ John Higgins

(Signature)

Dated:

December 4, 2022

13

Exhibits and schedules omitted in accordance with Item 601(a)(5) of Regulation S-K. A copy of any omitted schedule and/or annex will be

furnished as a supplement to the U.S. Securities and Exchange Commission upon request.

EXHIBIT A - PROPRIETARY INFORMATION AND INVENTIONS AGREEMENT

EXHIBIT B – EQUITY AWARDS

14

Exhibit 10.15

SEVERANCE AGREEMENT

This Severance Agreement (“ Agreement”) is made effective as of December 5, 2022, by and between Ligand Pharmaceuticals Incorporated, a

Delaware corporation (the “Company”), and Todd C. Davis (“ Employee”).

The parties agree as follows:

1.    Definitions. For purposes of this Agreement, the following terms shall have the following meanings:

    (a)    “Cause” shall mean any of the following: (i) Employee’s conviction of, or plea of “guilty” or “no contest” to, a felony under the laws of
the United States or any state thereof; (ii) Employee’s willful and material breach of any obligation or duty under this Agreement, the PIIA (as defined
below) or the Company’s written employment or other written policies that have previously been furnished to Employee, which breach is not cured
within thirty (30) days after written notice thereof is received by Employee, if such breach is capable of cure; (iii) Employee’s gross negligence or
willful misconduct, including without limitation, fraud, dishonesty or embezzlement, in the performance of his or her duties; or (iv) Employee’s
continuing failure or refusal to perform his or her assigned duties or to comply with reasonable directives of the Board of Directors that are consistent
with Employee’s job duties (which directives are not in conflict with applicable law), which failure is not cured within thirty (30) days after written
notice thereof is received by Employee.

transactions:

(b)    “Change in Control” shall mean a change in ownership or control of the Company effected through any of the following

            (i)     a merger, consolidation or other reorganization approved by the Company’s stockholders, unless securities representing more than fifty
percent (50%) of the total combined voting power of the voting securities of the successor corporation are immediately thereafter beneficially owned,
directly or indirectly and in substantially the same proportion, by the persons who beneficially owned the Company’s outstanding voting securities
immediately prior to such transaction; or

        (ii)     the sale, license, transfer or other disposition (including establishing a royalty trust) of an asset or assets in one transaction or a series of
related transactions which the Board of Directors determines, in its sole discretion, represent more than fifty percent (50%) of the aggregate value of the
Company’s assets; or

        (iii)     the acquisition, directly or indirectly by any person or related group of persons (other than the Company or a person that directly or
indirectly controls, is controlled by, or is under common control with, the Company), of beneficial ownership (within the meaning of Rule 13d-3 of the
1934 Act) of securities possessing more than fifty percent (50%) of the total combined voting power of the Company’s outstanding securities pursuant to
a tender or exchange offer made directly to the Company’s stockholders.

        Notwithstanding the foregoing, no transaction, event or occurrence shall constitute a Change in Control for purposes of this Agreement, unless such
transaction, event or occurrence also constitutes a “change in control event” as defined in Treasury Regulation Section 1.409A-3(i)(5).

(c)    “Good Reason” shall mean the occurrence of any of the following events or conditions without Employee’s written consent:

            (i)    a material diminution in Employee’s authority, duties or responsibilities;

            (ii)    a material diminution in Employee’s base compensation;

            (iii)    a material change in the geographic location at which Employee must perform his or her duties; or

            (iv)    any other action or inaction that constitutes a material breach by the Company or any successor or affiliate of its obligations to Employee
under this Agreement.

    Employee must provide written notice to the Company of the occurrence of any of the foregoing events or conditions without Employee’s written
consent within ninety (90) days of the occurrence of such event. The Company or any successor or affiliate shall have a period of thirty (30) days to cure
such event or condition after receipt of written notice of such event from Employee. Any voluntary termination of Employee’s employment for “Good
Reason” following such thirty (30) day cure period must occur no later than the date that is six (6) months following the initial occurrence of one of the
foregoing events or conditions without Employee’s written consent.

reasonable accommodation, for a period of at least one hundred twenty (120) consecutive days because of a physical or mental impairment.

(d)    “Permanent Disability” means Employee’s inability to perform the essential functions of his or her position, with or without

and equity award plans or agreements and any shares of stock issued upon exercise thereof.

(e)    “Stock Awards” means all stock options, restricted stock and such other awards granted pursuant to the Company’s stock option

2.    Severance.

    (a)    If Employee’s employment is terminated by the Company without Cause or by Employee for Good Reason, then subject to the

requirements of this Section 2 and Employee’s continued compliance with Section 3, Employee shall be entitled to receive, in lieu of any severance
benefits to which Employee may otherwise be entitled, including under any Other Arrangement (as defined below), the benefits provided below:

        (i)    The Company shall pay to Employee (A) his or her fully earned but unpaid base salary, when due, through the date of termination at
the rate then in effect, (B) his or her accrued but unpaid vacation or paid time off through the date of termination, when due, plus (C) all other amounts
or benefits to which Employee is entitled under any compensation, retirement or benefit plan or practice of the Company at the time of termination in
accordance with the terms of such plans or practices, including, without limitation, any continuation of benefits required by the Consolidated Omnibus
Budget Reconciliation Act of 1985, as amended (“COBRA”) or applicable law (the “ Accrued Obligations”);

        (ii)    (A)     If such termination occurs prior to a Change in Control or more than twenty-four (24) months following a Change in Control,
Employee shall be entitled to receive severance pay in an amount equal to Employee’s monthly base salary as in effect immediately prior to the date of
termination for the eighteen (18) month period following the date of termination; or

            (B)     If such termination occurs within twenty-four (24) months following a Change in Control, in lieu of the benefits in clause (ii)(A)

above, Employee shall be entitled to receive severance pay in an amount equal to the sum of:

                (1)    Employee’s monthly base salary as in effect immediately prior to the date of termination for the twenty-four (24)  month period

following the date of termination, plus

                (2)    Two (2) multiplied by the greater of (x) Employee’s maximum target bonus for the fiscal year during which the date of

termination occurs or (y) Employee’s maximum target bonus for the fiscal year during which the Change in Control occurs,

payable, in the case of both clauses (A) and (B), in a lump sum within ten (10) days following the effective date of Employee’s Release, but in no event
later than two and one-half (2 ½) months following the last day of the calendar year in which the date of Employee’s termination of employment occurs;

        (iii)     Employee shall be entitled to receive a lump sum cash payment equal to (A)  eighteen (18) multiplied by (B) the monthly premium
Employee would be required to pay for continuation coverage pursuant to COBRA for Employee and his or her eligible dependents who were covered
under the Company’s health plans as of the date of Employee’s termination such that Employee’s premiums are the same as for active employees
(calculated by reference to the premium as of the date of termination) (provided that Employee shall be solely responsible for all matters relating to his
or her continuation of coverage pursuant to COBRA, including, without limitation, his or her election of such coverage and his or her timely payment of
premiums), which payment shall be paid within ten (10) days following the effective date of

2

Employee’s Release, but in no event later than two and one-half (2 ½) months following the last day of the calendar year in which the date of
Employee’s termination of employment occurs; provided that the multiplier in clause (A) shall be increased to twenty-four (24) in the event such
termination occurs within twenty-four (24) months following a Change in Control;

            (iv)    The vesting and/or exercisability of any outstanding unvested portions of Employee’s Stock Awards the vesting of which is solely time-
based and not subject to the satisfaction of a performance condition shall be automatically accelerated on the effective date of Employee’s Release;
provided, however, that, any Stock Awards that vest in whole or in part based on the attainment of performance-vesting conditions shall be governed by
the terms of the applicable Stock Award agreement. Except as provided in Section 2(a)(v), Employee’s vested Stock Awards shall be governed by the
terms and conditions of the Stock Award agreements and the Company’s equity plan under which such Stock Awards were granted. Notwithstanding the
foregoing, in the event the Stock Award agreement or the equity plan pursuant to which the Stock Awards were granted provides for more favorable
treatment of Employee’s Stock Awards, nothing in this Agreement is intended to limit Employee’s right to such more favorable treatment as provided in
such Stock Award agreement or equity plan; and

            (v)     Notwithstanding anything to the contrary contained in the Company’s equity plan and the Stock Award agreements under which
Employee’s outstanding Stock Awards were granted:

            (A)    Subject to the terms and conditions contained in, and Employee’s continued compliance with, this Section 2(a)(v), the period of

time during which Employee may exercise his vested stock options following the date of Employee’s termination of employment (after giving effect to
the acceleration pursuant to Section 2(a)(iv) above) shall be extended to the earliest of (1) the second anniversary of the date of Employee’s termination
of employment or (2) the original ten-year expiration date of such options (the “Exercise Period Extension”);

            (B)    It shall be a condition to the Exercise Period Extension that Employee not sell, pledge, assign, hypothecate, transfer, or otherwise

dispose of (collectively, “Transfer”) on any single trading day occurring during the period commencing on the date of Employee’s termination of
employment and ending on the second anniversary of the date of Employee’s termination of employment, shares of the Company’s common stock
(including shares issuable upon vesting, settlement or exercise of Stock Awards) in an amount that is in excess of five percent (5%) of the average daily
trading volume of the Company’s common stock for the preceding calendar week, other than Permitted Transfers. For purposes of this Agreement, a
“Permitted Transfer” will include (1) the Transfer of any or all of the shares during Employee’s lifetime or upon Employee’s death by will or intestacy
to Employee’s Immediate Family or a trust for the benefit of Employee’s Immediate Family (provided that such Immediate Family or trust agrees to be
bound by the restrictions in this Section 2(a)(v)), (2) any Transfer upon the occurrence of, and in connection with, a Change in Control, (3) any Transfer
approved in writing by the Board, (4) any Transfer pursuant to the written trading plan adopted by Employee prior to the date of Employee’s termination
of employment in accordance with Rule 10b5-1, or (5) any Transfer to the Company in connection with tax withholding by the Company. As used
herein, “Immediate Family” shall mean Employee’s spouse, lineal descendant or antecedent, father, mother, brother or sister or stepchild (whether or not
adopted);

            (C)    It shall be a further condition to the Exercise Period Extension that, during the period commencing on the date of Employee’s

termination of employment and ending on the second anniversary of the date of Employee’s termination of employment, Employee not Transfer any of
the shares of the Company’s common stock held by Employee as of the date of Employee’s termination of employment in a brokerage account at
Morgan Stanley or E*Trade (or any shares issuable upon vesting, settlement or exercise of Stock Awards after the date of Employee’s termination of
employment) to another account without the prior written consent of the Company. Employee acknowledges and agrees that the Company may place
restrictions on any such brokerage account to ensure Employee’s compliance with the restrictions in this Section 2(a)(v);

            (D)    In the event Employee breaches this Section 2(a)(v) or Section 3, Employee’s ability to exercise his vested stock options shall

immediately cease and all of Employee’s vested stock options shall cease to be exercisable on the date of such breach and shall be forfeited; and

                (E)    Notwithstanding the foregoing, in the event the Stock Award agreement or the equity plan pursuant to which the Stock Awards were
granted provides for more favorable

3

treatment of Employee’s Stock Awards, nothing in this Agreement is intended to limit Employee’s right to such more favorable treatment as provided in
such Stock Award agreement or equity plan.

(b)    Other Terminations. If Employee’s employment is terminated at any time by the Company for Cause, by Employee without Good
Reason, or as a result of Employee’s death or Permanent Disability, the Company shall not have any other or further obligations to Employee under this
Agreement (including any financial obligations) except that Employee shall be entitled to receive the Accrued Obligations and any rights Employee may
have to severance under the Company’s standard severance policy. The foregoing shall be in addition to, and not in lieu of, any and all other rights and
remedies which may be available to the Company under the circumstances, whether at law or in equity.

(c)    Release. As a condition to Employee’s receipt of any post-termination benefits pursuant to Section 2(a) above, Employee shall

execute and not revoke a general release of all claims in favor of the Company and its affiliates (the “Release”) in the form attached hereto as Exhibit A.
Employee’s Release shall be deemed effective on the day following the expiration of any applicable revocation period. In the event the Release does not
become effective within the fifty-five (55) day period following the date of Employee’s termination of employment, Employee shall not be entitled to
the aforesaid payments and benefits.

        (d)    Exclusive Remedy. Except as otherwise expressly required by law (e.g., COBRA) or as specifically provided herein, all of Employee’s rights
to salary, severance, benefits, bonuses and other amounts hereunder (if any) accruing after the termination of Employee’s employment shall cease upon
such termination. In addition, the severance payments provided for in Section 2(a) above are intended to be the exclusive severance benefits payable to
Employee, and such severance payments shall be paid in lieu of any severance payments Employee may otherwise be entitled to receive under any other
plan, program, policy or agreement with the Company or any of its affiliates (including, without limitation, the Company’s Amended and Restated
Severance Plan) (collectively, “Other Arrangements”). Therefore, in the event Employee becomes entitled to receive the severance payments and
benefits provided under Section 2(a) of this Agreement, he or she shall receive the amounts provided under that section of this Agreement and shall not
be entitled to receive any severance payments or severance benefits pursuant to any Other Arrangements. In the event of a termination of Employee’s
employment with the Company, Employee’s sole remedy shall be to receive the payments and benefits described in this Section 2. Employee
acknowledges that he will not be an eligible participant under the Company’s Amended and Restated Severance Plan.

        (e)    No Mitigation. Employee shall not be required to mitigate the amount of any payment provided for in this Section 2 by seeking other
employment or otherwise, nor shall the amount of any payment or benefit provided for in this Section 2 be reduced by any compensation earned by
Employee as the result of employment by another employer or self-employment or by retirement benefits; provided, however, that loans, advances or
other amounts owed by Employee to the Company may be offset by the Company against amounts payable to Employee under this Section 2.

    (f)    Return of the Company’s Property. If Employee’s employment is terminated for any reason, the Company shall have the right, at its

option, to require Employee to vacate his or her offices prior to or on the effective date of termination and to cease all activities on the Company’s
behalf. Upon the termination of his or her employment in any manner, as a condition to Employee’s receipt of any post-termination benefits described in
this Agreement, Employee shall immediately surrender to the Company all lists, books and records of, or in connection with, the Company’s business,
and all other property belonging to the Company, it being distinctly understood that all such lists, books and records, and other documents, are the
property of the Company. Employee shall deliver to the Company a signed statement certifying compliance with this Section 2(f) prior to the receipt of
any post-termination benefits described in this Agreement.

        (g)    Best Pay Provision.

(i)

In the event that any payment or benefit received or to be received by Employee pursuant to the terms of any plan,
arrangement or agreement (including any payment or benefit received in connection with a change in ownership or control or the termination of the
Employee’s employment) (all such payments and benefits being hereinafter referred to as the “Total Payments”) would be subject (in whole or part) to
the excise tax (the “Excise Tax”) imposed under Section 4999 of the Internal Revenue Code of 1986, as amended (the “ Code”), then the Total Payments
shall be reduced

4

to the extent necessary so that no portion of the Total Payments is subject to the Excise Tax but only if (A) the net amount of such Total Payments, as so
reduced (after subtracting the amount of federal, state and local income taxes on such reduced Total Payments and after taking into account the phase out
of itemized deductions and personal exemptions attributable to such reduced Total Payments) is greater than or equal to (B) the net amount of such Total
Payments without such reduction (after subtracting the net amount of federal, state and local income taxes on such Total Payments and the amount of
Excise Tax to which Employee would be subject in respect of such unreduced Total Payments and after taking into account the phase out of itemized
deductions and personal exemptions attributable to such unreduced Total Payments). Except to the extent that an alternative reduction order would result
in a greater economic benefit to Employee on an after-tax basis, the parties intend that the Total Payments shall be reduced in the following order: (w)
reduction of any cash severance payments otherwise payable to Employee that are exempt from Section 409A of the Code, (x) reduction of any other
cash payments or benefits otherwise payable to Employee that are exempt from Section 409A of the Code, but excluding any payment attributable to the
acceleration of vesting or payment with respect to any equity award that is exempt from Section 409A of the Code, (y) reduction of any other payments
or benefits otherwise payable to Employee on a pro-rata basis or such other manner that complies with Section 409A of the Code, but excluding any
payment attributable to the acceleration of vesting and payment with respect to any equity award that is exempt from Section 409A of the Code, and (z)
reduction of any payments attributable to the acceleration of vesting or payment with respect to any equity award that is exempt from Section 409A of
the Code; provided, in case of clauses (x), (y) and (z), that reduction of any payments or benefits attributable to the acceleration of vesting of Company
equity awards shall be first applied to equity awards with later vesting dates; provided, further, that, notwithstanding the foregoing, any such reduction
shall be undertaken in a manner that complies with and does not result in the imposition of additional taxes on Employee under Section 409A of the
Code. The foregoing reductions shall be made in a manner that results in the maximum economic benefit to Employee on an after-tax basis and, to the
extent economically equivalent payments or benefits are subject to reduction, in a pro rata manner.

    (ii)    All determinations regarding the application of this Section 2(g) shall be made by an independent accounting firm or consulting

group with nationally recognized standing and substantial expertise and experience in performing calculations regarding the applicability of Section
280G of the Code and the Excise Tax retained by the Company prior to the date of the applicable change in ownership or control (the “280G Firm”). For
purposes of determining whether and the extent to which the Total Payments will be subject to the Excise Tax, (A) no portion of the Total Payments shall
be taken into account which (x) does not constitute a “parachute payment” within the meaning of Section 280G(b)(2) of the Code (including by reason of
Section 280G(b)(4)(A) of the Code) and, in calculating the Excise Tax, or (y) constitutes reasonable compensation for services actually rendered, within
the meaning of Section 280G(b)(4)(B) of the Code, in excess of the “base amount” (as defined in Section 280G(b)(3) of the Code) allocable to such
reasonable compensation, (B) no portion of the Total Payments the receipt or enjoyment of which Employee shall have waived at such time and in such
manner as not to constitute a “payment” within the meaning of Section 280G(b) of the Code shall be taken into account, and (C) the value of any non-
cash benefit or any deferred payment or benefit included in the Total Payments shall be determined by the 280G Firm in accordance with the principles
of Sections 280G(d)(3) and (4) of the Code. All determinations related to the calculations to be performed pursuant to this “Best Pay Provision” section
shall be done by the 280G Firm. The 280G Firm will be directed to submit its determination and detailed supporting calculations to both Employee and
the Company within fifteen (15) days after notification from either the Company or Employee that Employee may receive payments which may be
“parachute payments.” Employee and the Company will each provide the 280G Firm access to and copies of any books, records, and documents as may
be reasonably requested by the 280G Firm, and otherwise cooperate with the 280G Firm in connection with the preparation and issuance of the
determinations and calculations contemplated by this Agreement. The fees and expenses of the 280G Firm for its services in connection with the
determinations and calculations contemplated by this Agreement will be borne solely by the Company.

        (h)    Withholding. All compensation and benefits to Employee hereunder shall be reduced by all federal, state, local and other withholdings and
similar taxes and payments required by applicable law.

        (i)    Deemed Resignation. Upon termination of Employee’s employment for any reason, Employee shall be deemed to have resigned from all
offices and directorships, if any, then held with the Company or any of its subsidiaries, including his position as a member of the Board, if applicable,
and shall take all actions reasonably requested by the Company to effectuate the foregoing.

5

Employee’s resignation from all such positions shall be a condition to receive of the severance payments to Employee under Section 2(a).

3.

Restrictive Covenants.

(a)

PIIA. Employee and the Company have executed the Company’s proprietary information and inventions agreement, a copy of

which is attached to this Agreement as Exhibit B and incorporated herein by reference (the “ PIIA”). The Company shall be entitled to cease all
severance payments to Employee in the event of his or his or her breach of this Section 3.

(b)

Protected Activities. Notwithstanding anything herein to the contrary, nothing in this Agreement or the PIIA shall (i) prohibit

Employee from filing a charge with the Equal Employment Opportunity Commission, the National Labor Relations Board, the Occupational Safety and
Health Administration, the Securities and Exchange Commission or any other comparable federal agency, state agency or securities regulatory body (the
“Government Agencies”); (ii) prohibit Employee from reporting possible violations of law to an appropriate Government Agency in a confidential
manner without notice to the Company as authorized in any whistleblower protection provisions of any federal or state law or regulation; (iii)
communicating directly with any governmental, law enforcement, regulatory or self-regulatory body; (iv) limit Employee’s lawful opportunity to
cooperate with or participate in any administrative proceeding or investigation that may be conducted by a Government Agency; (v) receive awards from
a Government Agency as a result of reporting or cooperation; or (vi) prohibit Employee from discussing or disclosing information about unlawful acts in
the workplace, such as harassment or discrimination or any other conduct that Employee has reason to believe is unlawful. With respect to any
information disclosed pursuant to this protected activity exception that may constitute confidential or proprietary information, Employee agrees to take
all reasonable precautions to prevent any unauthorized use or disclosure to any parties other than the relevant agency or authority. Except as prohibited
by applicable law, rule, or regulation, the payments paid to pursuant to this Agreement will be the sole monetary relief available to Employee, and
Employee will not be entitled to recover, and agrees to waive, any additional personal monetary relief that may be sought from or awarded against the
Company in the future without regard to who filed or brought such claim. However, this Agreement does not waive Employee’s right to receive an award
for original information from any Government Agency, including but not limited to any such award pursuant to Section 21F of the Securities Exchange
Act of 1934. Further, Employee’s participation in an investigation or other legal matter may include a disclosure of trade secret information provided
that it must comply with the restrictions in the Defend Trade Secrets Act of 2016 (“DTSA”). The DTSA provides that no individual will be held
criminally or civilly liable under Federal or State trade secret law for the disclosure of a trade secret that: (x) is made in confidence to a Federal, State, or
local government official, either directly or indirectly, or to an attorney; and made solely for the purpose of reporting or investigating a suspected
violation of law; or (y) is made in a complaint or other document if such filing is under seal so that it is not made public. Also, an individual who
pursues a lawsuit for retaliation by an employer for reporting a suspected violation of the law may disclose the trade secret to the attorney of the
individual and use the trade secret information in the court proceeding, if the individual files any document containing the trade secret under seal, and
does not disclose the trade secret, except as permitted by court order.

4.

Dispute Resolution. Any controversy, claim or dispute arising out of or relating to this Agreement, shall be settled solely and exclusively
by binding arbitration in accordance with the arbitration provisions contained in the Mutual Agreement to Arbitrate between Employee and the Company
(the “Arbitration Agreement”), a copy of which is attached to this Agreement as  Exhibit C and incorporated herein by reference. This Section 4 is
intended to be the exclusive method for resolving any and all claims by the parties against each other for payment of damages under this Agreement or
relating to Employee’s employment; provided, however, that neither this Agreement nor the submission to mediation or arbitration shall limit the parties’
right to seek provisional relief, including without limitation injunctive relief, in any court of competent jurisdiction pursuant to California Code of Civil
Procedure § 1281.8 or any similar statute of an applicable jurisdiction. Seeking any such relief shall not be deemed to be a waiver of such party’s right to
compel arbitration. Both Employee and the Company expressly waive their right to a jury trial. The parties agree that any claim asserted in arbitration
may be made only on an individual basis, and the parties may not assert claims on a representative, class or other collective basis. Finally, Employee
agrees that Employee has been provided an opportunity to seek the advice of an attorney of Employee’s choice before signing this Agreement.

6

5.

At-Will Employment Relationship. Employee’s employment with the Company is at-will and not for any specified period and may be

terminated at any time, with or without Cause or advance notice, by either Employee or the Company. Any change to the at-will employment
relationship must be by specific, written agreement signed by Employee and an authorized representative of the Company. Nothing in this Agreement is
intended to or should be construed to contradict, modify or alter this at-will relationship.

6.

General Provisions.

(a)

Successors and Assigns. The rights of the Company under this Agreement may, without the consent of Employee, be assigned by

the Company, in its sole and unfettered discretion, to any person, firm, corporation or other business entity which at any time, whether by purchase,
merger or otherwise, directly or indirectly, acquires all or substantially all of the assets or business of the Company. The Company will require any
successor (whether direct or indirect, by purchase, merger or otherwise) to all or substantially all of the business or assets of the Company expressly to
assume and to agree to perform this Agreement in the same manner and to the same extent that the Company would be required to perform it if no such
succession had taken place; provided, however, that no such assumption shall relieve the Company of its obligations hereunder.  As used in this
Agreement, the “Company” shall mean the Company as hereinbefore defined and any successor to its business and/or assets as aforesaid which assumes
and agrees to perform this Agreement by operation of law or otherwise. Employee shall not be entitled to assign any of Employee’s rights or obligations
under this Agreement. This Agreement shall inure to the benefit of and be enforceable by Employee’s personal or legal representatives, executors,
administrators, successors, heirs, distributees, devisees and legatees.

(b)

Severability. In the event any provision of this Agreement is found to be unenforceable by an arbitrator or court of competent

jurisdiction, such provision shall be deemed modified to the extent necessary to allow enforceability of the provision as so limited, it being intended that
the parties shall receive the benefit contemplated herein to the fullest extent permitted by law. If a deemed modification is not satisfactory in the
judgment of such arbitrator or court, the unenforceable provision shall be deemed deleted, and the validity and enforceability of the remaining provisions
shall not be affected thereby.

(c)

Interpretation; Construction. The headings set forth in this Agreement are for convenience only and shall not be used in
interpreting this Agreement. This Agreement has been drafted by legal counsel representing the Company, but Employee has participated in the
negotiation of its terms. Furthermore, Employee acknowledges that Employee has had an opportunity to review and revise the Agreement and have it
reviewed by legal counsel, if desired, and, therefore, the normal rule of construction to the effect that any ambiguities are to be resolved against the
drafting party shall not be employed in the interpretation of this Agreement. Either party’s failure to enforce any provision of this Agreement shall not in
any way be construed as a waiver of any such provision, or prevent that party thereafter from enforcing each and every other provision of this
Agreement.

(d)

Governing Law and Venue. This Agreement will be governed by and construed in accordance with the laws of the United States

and the State of California applicable to contracts made and to be performed wholly within such State, and without regard to the conflicts of laws
principles thereof. Any suit brought hereon shall be brought in the state or federal courts sitting in San Diego County, California, the Parties hereby
waiving any claim or defense that such forum is not convenient or proper. Each party hereby agrees that any such court shall have in personam
jurisdiction over it and consents to service of process in any manner authorized by California law.

(e)

Notices. Any notice required or permitted by this Agreement shall be in writing and shall be delivered as follows with notice

deemed given as indicated: (i) by personal delivery when delivered personally; (ii) by overnight courier upon written verification of receipt; (iii) by
telecopy or facsimile transmission upon acknowledgment of receipt of electronic transmission; or (iv) by certified or registered mail, return receipt
requested, upon verification of receipt. Notice shall be sent to Employee at his most recent residence and personal email address on file with the
Company and to the Company at its principal place of business, or such other address as either party may specify in writing.

Provisions”) of this Agreement shall survive termination of Employee’s employment by the Company.

(f)

Survival. Sections 1 (“Definitions”), 2 (“Severance”), 3 (“Restrictive Covenants”), 4 (“Dispute Resolution”) and 6 (“General

7

(g)

Entire Agreement. This Agreement, the Arbitration Agreement and the PIIA incorporated herein by reference together constitute

the entire agreement between the parties in respect of the subject matter contained herein and therein and supersede all prior or simultaneous
representations, discussions, negotiations, and agreements, whether written or oral; provided, however, that for the avoidance of doubt, all Other
Arrangements (as such Other Arrangements may be amended, modified or terminated from time to time) shall remain in effect in accordance with their
terms, subject to Section 2(d) hereof. This Agreement may be amended or modified only with the written consent of Employee and an authorized
representative of the Company. No oral waiver, amendment or modification will be effective under any circumstances whatsoever.

(h)

Code Section 409A Exempt.

(i)

To the extent applicable, this Agreement shall be interpreted in accordance with Section 409A of the Code and the
regulations and guidance promulgated thereunder (collectively, “Section 409A”). The intent of the parties is that payments and benefits under this
Agreement comply with, or be exempt from Code Section 409A and, accordingly, to the maximum extent permitted, this Agreement shall be interpreted
to be in compliance with such intention. To the extent that any provision in this Agreement is ambiguous as to its compliance with or exemption from
Code Section 409A, the provision shall be read in such a manner that no payments payable under this Agreement shall be subject to an “additional tax”
as defined in Section 409A(a)(1)(B) of the Code. If the Company and Employee determine that any compensation or benefits payable under this
Agreement may be or become subject to Code Section 409A and related Department of Treasury guidance, the Company and Employee agree to amend
this Agreement or adopt other policies or procedures (including amendments, policies and procedures with retroactive effect), or take such other actions
as the Company and Employee deem necessary or appropriate to (A) exempt the compensation and benefits payable under this Agreement from Code
Section 409A and/or preserve the intended tax treatment of the compensation and benefits provided with respect to this Agreement, or (B) comply with
the requirements of Code Section 409A and related Department of Treasury guidance.

(ii)

For purposes of Section 409A of the Code, any right to a series of installment payments under this Agreement shall be

treated as a right to a series of separate payments. For purposes of this Agreement, to the extent necessary to ensure that the payments hereunder comply
with or are exempt from Code Section 409A, all references to Employee’s “termination of employment” shall mean his “separation from service” (as
defined in Treasury Regulation Section 1.409A-1(h)).

(iii)

Notwithstanding anything in this Agreement to the contrary, if Employee is deemed by the Company at the time of

Employee’s separation from service to be a “specified employee” for purposes of Section 409A, to the extent delayed commencement of any portion of
the benefits to which Employee is entitled under this Agreement is required in order to avoid a prohibited distribution under Section 409A, such portion
of Employee’s benefits shall not be provided to Employee prior to the earlier of (A) the expiration of the six-month period measured from the date of
Employee’s separation from service with the Company or (B) the date of Employee’s death. Upon the first business day following the expiration of the
applicable Section 409A period, all payments deferred pursuant to the preceding sentence shall be paid in a lump sum to Employee (or Employee’s
estate or beneficiaries), and any remaining payments due to Employee under this Agreement shall be paid as otherwise provided herein.

In the event that the amounts payable under this Agreement constitute “non-qualified deferred compensation” subject to
Code Section 409A, and the timing of the delivery of Employee’s Release could cause the severance benefits described in Section 2(a) to be paid in one
or another calendar year, then notwithstanding the payment timing set forth in such section, such amounts shall not be payable until the later of (A)
January 1 of the second calendar year, or (B) the payment date set forth in Section 2(a).

(iv)

(v)

To the extent required by Code Section 409A, any reimbursement or in-kind benefit provided under this Agreement shall
be provided in accordance with the following: (A) the amount of expenses eligible for reimbursement, or in-kind benefits provided during each calendar
year cannot affect the expenses eligible for reimbursement, or in-kind benefits to be provided, in any other calendar year; (B) any payments in lieu of the
benefits shall be paid no later than the end of Employee’s taxable year next following Employee’s taxable year in which the benefit or expense was due
to be paid;

8

and (C) any right to reimbursements or in-kind benefits under this Agreement shall not be subject to liquidation or exchange for another benefit.

which together shall constitute one and the same instrument.

6.9    Counterparts. This Agreement may be executed in multiple counterparts, each of which shall be deemed an original but all of

(Signature Page Follows)

9

    THE PARTIES TO THIS AGREEMENT HAVE READ THE FOREGOING AGREEMENT AND FULLY UNDERSTAND EACH AND EVERY
PROVISION CONTAINED HEREIN. WHEREFORE, THE PARTIES HAVE EXECUTED THIS AGREEMENT ON THE DATES SHOWN
BELOW.

Ligand Pharmaceuticals Incorporated

Dated:     December 4, 2022            By: /s/ Andrew T. Reardon            

    Name: Andrew T. Reardon            
    Title: Chief Legal Officer and Secretary         

Employee

Dated:     December 4, 2022             /s/ Todd C. Davis                

Todd C. Davis

Address:                 

10

                     
Exhibits and schedules omitted in accordance with Item 601(a)(5) of Regulation S-K. A copy of any omitted schedule and/or annex will be

furnished as a supplement to the U.S. Securities and Exchange Commission upon request.

EXHIBIT A - GENERAL RELEASE OF CLAIMS

EXHIBIT B - PROPRIETARY INFORMATION AND INVENTIONS AGREEMENT

EXHIBIT C - MUTUAL ARBITRATION AGREEMENT

    
LIGAND PHARMACEUTICALS INCORPORATED
LIST OF SUBSIDIARIES

Exhibit 21.1

Name
Allergan Ligand Retinoid Therapeutics, Inc.
Aramed Inc.
Cita NeuroPharmaceuticals Inc.
CyDex Pharmaceuticals, Inc.         
Glycomed Incorporated                 
Ligand Biopharmaceuticals Incorporated
Ligand Holdings UK Limited
Ligand JVR, Inc.
Ligand Pharmaceuticals (Canada) Incorporated
Ligand Pharmaceuticals International, Inc.
Ligand Pharmaceuticals UK Limited
Ligand UK Development Limited
Ligand UK Group Limited
Ligand UK Limited
Ligand UK Research Limited
Metabasis Therapeutics, Inc.
Neurogen Corporation
Pfenex Inc.
Pharmacopeia, LLC
Seragen Incorporated
Seragen Technology, Inc.
Vernalis Therapeutics Inc.
Verrow Pharmaceuticals

Jurisdiction of Incorporation
Delaware
Delaware
Canada
Delaware
California
Delaware
England and Wales
Delaware
Canada
Delaware
United Kingdom
England and Wales
England and Wales
England and Wales
England and Wales
Delaware
Delaware
Delaware
Delaware
Delaware
Delaware
Delaware
Kansas

Exhibit 23.1

We consent to the incorporation by reference in the following Registration Statements:

(1) Registration Statement (Form S-3ASR No. 333-267678) of Ligand Pharmaceuticals Incorporated,

Consent of Independent Registered Public Accounting Firm

(2) Registration Statement (Form S-8 No. 333-266737) pertaining to the 2022 Employment Inducement Plan of Ligand Pharmaceuticals Incorporated,

(3) Registration Statement (Form S-8 No. 333-265545) pertaining to the 2002 Stock Incentive Plan, as amended and restated of Ligand Pharmaceuticals Incorporated,

(4) Registration Statement (Form S-8 No. 333-252480) pertaining to the 2002 Stock Incentive Plan, as amended and restated of Ligand Pharmaceuticals Incorporated,

(5) Registration Statement (Form S-8 No. 333-233130) pertaining to the 2002 Stock Incentive Plan, as amended and restated of Ligand Pharmaceuticals Incorporated,

(6) Registration Statement (Form S-8 No. 333-212775) pertaining to the 2002 Stock Incentive Plan, as amended and restated of Ligand Pharmaceuticals Incorporated,

(7) Registration Statement (Form S-8 No. 333-182547) pertaining to the 2002 Stock Incentive Plan, as amended and restated of Ligand Pharmaceuticals Incorporated,

(8) Registration Statement (Form S-8 No. 333-160132) pertaining to the 2002 Stock Incentive Plan, as amended and restated, and Employee Stock Purchase Plan, as amended
and restated of Ligand Pharmaceuticals Incorporated, and

(9) Registration Statement (Form S-8 No. 333-131029) pertaining to the 2002 Stock Incentive Plan and 2002 Employee Stock Purchase Plan of Ligand Pharmaceuticals
Incorporated;

of our reports dated February 28, 2023, with respect to the consolidated financial statements of Ligand Pharmaceuticals Incorporated and the effectiveness of internal control
over financial reporting of Ligand Pharmaceuticals Incorporated included in this Annual Report (Form 10-K) of Ligand Pharmaceuticals Incorporated for the year ended
December 31, 2022.

/s/ Ernst & Young LLP

San Diego, California
February 28, 2023

 
  
 
 
I, Todd C. Davis, certify that:

1. I have reviewed this Annual Report on Form 10-K of Ligand Pharmaceuticals Incorporated;

Exhibit 31.1

2. 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;

3. 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;

4. 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)

a)

b)

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):

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:  February 28, 2023

/s/ Todd C. Davis

Todd C. Davis
Chief Executive Officer
(Principal Executive Officer)

I, Octavio Espinoza, certify that:

1. I have reviewed this Annual Report on Form 10-K of Ligand Pharmaceuticals Incorporated;

Exhibit 31.2

2. 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;

3. 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;

4. 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)

a)

b)

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):

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:    February 28, 2023

/s/ Octavio Espinoza

Octavio Espinoza
Chief Financial Officer
(Principal Financial Officer)

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

In connection with the Annual Report of Ligand Pharmaceuticals Incorporated (the “Company”) on Form 10-K for the year ended December 31, 2022, as filed with the

Securities and Exchange Commission on the date hereof (the “Report”), I, Todd C. Davis, Chief Executive Officer 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 to my knowledge:

(1)

(2)

The Report fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Securities Exchange Act of 1934, as

amended; and

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:

February 28, 2023

/s/ Todd C. Davis

Todd C. Davis
Chief Executive Officer
(Principal Executive Officer)

The foregoing certification is being furnished solely to accompany the Report pursuant to 18 U.S.C. Section 1350, and is not being filed for purposes of Section 18 of the

Securities Exchange Act of 1934, as amended, and is not to be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless

of any general incorporation language in such filing. A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by

the Company and furnished to the Securities and Exchange Commission or its staff upon request.

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

In connection with the Annual Report of Ligand Pharmaceuticals Incorporated (the “Company”) on Form 10-K for the year ended December 31, 2022, as filed with the

Securities and Exchange Commission on the date hereof (the “Report”), I, Octavio Espinoza, Chief Financial Officer 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 to my knowledge:

(1)

(2)

The Report fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Securities Exchange Act of 1934, as

amended; and

The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the

Company.

Date:

February 28, 2023

/s/ Octavio Espinoza

Octavio Espinoza
Chief Financial Officer
(Principal Financial Officer)

The foregoing certification is being furnished solely to accompany the Report pursuant to 18 U.S.C. Section 1350, and is not being filed for purposes of Section 18 of the

Securities Exchange Act of 1934, as amended, and is not to be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless

of any general incorporation language in such filing. A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by

the Company and furnished to the Securities and Exchange Commission or its staff upon request.