Omeros Corporation Annual Report 2015

FY2015 Annual Report · Omeros Corporation

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NEXT-GENERATION THERAPEUTICS TRANSFORMING PATIENT CARE TODAY

TO OUR SHAREHOLDERS: 2015 marked the year that Omeros joined an uncommon group
of biopharmaceutical companies – those that have commercialized a drug product. With
the broad U.S. launch of OMIDRIA® (phenylephrine and ketorolac injection) 1% / 0.3% in
April, Omeros is now among the few biotechnology or pharmaceutical companies to ever
reach commercial status.

Throughout the year, patient access to OMIDRIA continued to grow. In the fourth quarter,
to ensure that all patients could access the drug, we implemented the OMIDRIAssure™
Comprehensive Reimbursement Services Program. This includes an information hotline for
physicians and their staff together with two programs to assist patients in accessing OMIDRIA,
the “Equal Access” patient assistance program for government-insured patients and the
“We Pay the Difference” commercial reimbursement program. Investing in our ability to
reach the decision makers – ophthalmic surgeons and their facility administrators – who
drive adoption of the drug, we converted the majority of our contracted sales force to
Omeros employees, hired additional representatives and partnered with an experienced
ophthalmology sales organization to sell OMIDRIA in the “square” states not covered by our
in-house team. Reimbursement also progressively expanded, with coverage for OMIDRIA
now confirmed for approximately 95% of the lives insured by the top 30 U.S. commercial
payers as well as for beneficiaries across a wide range of regional payers.

Matching the importance of increased access and reimbursement is the strongly positive
physician response to OMIDRIA. This response has been further enhanced by recent
investigator-sponsored studies that demonstrate statistically significant reduction in
small pupil-associated complication rates, in usage of costly pupil-expanding devices
and in age-adjusted surgical times together with statistically significant improvement
in visual acuity on the day after surgery and in prevention of miosis during femtosecond
laser-assisted surgery. With its clear patient benefits and positive economic potential for
both payers and providers, we expect OMIDRIA to achieve positive cash-flow status for
Omeros later this year.

Our pipeline programs also made significant progress during 2015. Our mannan-binding
lectin-associated serine protease, or MASP, program advanced on several fronts. We
reported positive efficacy and safety data for OMS721 in Phase 2 clinical trials in patients
with thrombotic microangiopathies, or TMAs, including atypical hemolytic uremic
syndrome, or aHUS. OMS721 targets MASP-2, the effector enzyme of the lectin pathway
in the complement system, a key component of the immune response. We exclusively
control the intellectual property rights directed to MASP-2 and to therapeutics targeting
the enzyme. Our compassionate-use program for OMS721 expanded, with physicians
increasingly requesting initial or continued access to OMS721 to treat their TMA patients.

In 2015, OMS721 received Fast Track designation from the FDA for the treatment of patients
with aHUS and, based on the strength of our Phase 2 data, earlier this year we discussed
with the FDA advancing to a Phase 3 program for OMS721 in aHUS patients. Following
the agreements reached in that discussion, we initiated a Phase 3 program consisting
of one single-arm (i.e., no control arm), open-label clinical trial in patients with newly
diagnosed or ongoing aHUS. The trial design and endpoints will be very similar to those
required for the approval of Soliris® (eculizumab). The FDA opened the possibility of
accelerated approval, and we expect that we will be able to qualify for that shorter path
to commercialization. Patient enrollment in the Phase 3 trial is planned to begin later
this year. Discussions are also underway with the European Medicines Agency regarding
the Phase 3 program and requirements for OMS721 marketing authorization in Europe.
In addition to our Phase 3 program in aHUS, we currently are advancing OMS721 Phase 2
clinical trials in TMAs, specifically hematopoietic stem cell transplant-related TMAs and
thrombotic thrombocytopenic purpura, and in glomerulonephropathies including systemic
lupus erythematosus and C3, membranous and IgA nephropathies.

The second part of our MASP program – OMS906 or our MASP-3 inhibitor –made substantial
strides as well. Omeros was the first to identify MASP-3 as the activator of the complement
system’s alternative pathway, and we have established broad intellectual property around
therapeutics targeting MASP-3 for alternative pathway-related diseases and disorders.
We have generated internally a series of highly potent, functionally active antibodies
against MASP-3 and plan to initiate scale-up of our lead antibody OMS906 later this
year in preparation for clinical trials, which are expected to begin enrollment in 2018. In
addition to our MASP-2 and MASP-3 antibodies, we are developing small molecules against
both targets. Between all of these therapeutic inhibitors at the effector and activator
enzymes of the lectin and alternative pathways and the related patent estates that we
have established and continue to expand, we believe that Omeros controls a wide and
valuable portion of the complement space.

Our OMS824 program focused on Huntington’s disease also advanced. OMS824 is our lead
phosphodiesterase 10, or PDE10, inhibitor. PDE10 is an enzyme expressed in areas of the brain
strongly linked to disorders that affect cognition, including Huntington’s disease and schizophrenia.

As we reported previously, clinical trials evaluating OMS824 in Huntington’s were suspended
in 2014 at the request of the FDA following an observation in a small number of rats from
a nonclinical study. Based on FDA’s review of our submission of requested data, in 2015
we resumed our PDE10 Huntington’s clinical program with a dosing limitation. We are
conducting additional nonclinical studies aimed at removing that limitation. In addition,
we currently are designing a new Phase 2 clinical trial and have reason to believe it should
demonstrate a beneficial effect of OMS824 in Huntington’s.

In addition, we made important headway in our PDE7 and Plasmin programs. Our PDE7
program is based on our discoveries of previously unknown links between PDE7 and any
addiction or compulsive disorder and between PDE7 and any movement disorder, such as
Parkinson’s disease. Our initial development focus is on addictive and compulsive disorders,
and we believe that we have elucidated the neural mechanism by which PDE7 inhibitors
can treat both acute and chronic addiction. In December of last year, we were granted a
U.S. patent broadly claiming the use of any PDE7 inhibitor to treat any substance addiction
or any addictive or compulsive behavior. We expect to bring our PDE7 inhibitor, OMS527,
into the clinic for the treatment of addiction in 2017. Our plasmin inhibitor, OMS616, is
also moving toward the clinic. We expect that the OMS616 clinical program initially will
target bleeding disorders and are evaluating recent data that indicate the potential for
broader therapeutic applicability.

We also made exciting progress in our G protein-coupled receptor, or GPCR, program, which
is uniquely capable of finding functionally active compounds, or ligands, for previously
undruggable orphan GPCRs. We have identified and, we believe, solely possess ligands
that allow us to develop drugs targeting over 50 orphan GPCRs. Medicinal chemistry,
compound optimization and animal studies are continuing across a handful of these
receptors in preparation for clinical trials, including: GPR17, linked to myelin formation;
GPR101, linked to appetite and eating disorders; GPR151, linked to neuropathic pain
and cognition; GPR161, associated with triple-negative breast cancer; GPR183, linked to
osteoporosis and to Epstein-Barr virus infections and associated diseases; and GPR174, which
appears to affect modulation of regulatory T cells, or “T-regs,” known to be important in
autoimmune disease such as multiple sclerosis, in cancer and in organ transplantation. We
continue to strengthen our intellectual property position around these receptors and the
remainder of the more than 50 orphan GPCRs that we believe Omeros exclusively controls.

Our internal antibody program also contributed significantly to our pipeline, generating
OMS906 and other MASP-3 antibodies, additional MASP-2 antibodies, and antibodies
against frizzled class receptor 10, or FZD10, associated with synovial sarcoma and gastric
cancer. All of these antibodies demonstrate strong functional activity and are highly potent
against their respective targets. We look forward to advancing to the clinic a number of
these and other antibodies generated by our antibody program.

Throughout the year, consistent with our focus on excellence, we continued to strengthen the
Omeros team, hiring several key employees across the company and adding Dr. Rajiv Shah,
former Administrator of the United States Agency for International Development (USAID),
to our Board of Directors. At USAID, Dr. Shah creatively forged strategic partnerships with
corporations and private capital to address some of the most pressing global problems,
and he is a valuable addition to our team as we continue to expand our development,
commercial, and governmental activities.

2015 was an exceptional year for Omeros – we are now a commercial company with
revenues funding development of a deep and diverse product pipeline built on a foundation
of cutting-edge science. Collectively, these products target a range of ultra-orphan to
large-market indications, all aiming to help patients with debilitating or fatal disorders.
We expect to continue our record of success through 2016 and beyond, growing OMIDRIA
sales, advancing our OMS721 Phase 3 and our multiple Phase 2 programs, and bringing
other pipeline programs into the clinic.

We have taken a large step in realizing our vision of building a fully integrated, independent
biopharmaceutical company, one with a long line of successful commercial products focused
on transforming patient care. On behalf of our board of directors and employees, I would
like to thank you, our shareholders, for your continued support.

Sincerely,

Gregory A. Demopulos, M.D.
Chairman & Chief Executive Officer
April 22, 2016

FORM 10-K
2015

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
________________________________________
FORM 10-K
________________________________________

(Mark One)

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

For the fiscal year ended December 31, 2015
or

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

For the transition period from to

Commission file number: 001-34475
________________________________________

OMEROS CORPORATION

(Exact name of registrant as specified in its charter)
________________________________________

Washington
(State or other jurisdiction of
incorporation or organization)

201 Elliott Avenue West
Seattle, Washington
(Address of principal executive offices)

91-1663741
(I.R.S. Employer
Identification Number)

98119
(Zip Code)

(206) 676-5000
(Registrant’s telephone number, including area code)
Securities registered pursuant to Section 12(b) of the Act:

Common Stock, $0.01 par value per share
(Title of each class)

The NASDAQ Stock Market LLC
(Name of each exchange on which registered)

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

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the

Act. Yes

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, as amended, during the preceding 12 months (or for such shorter period that the registrant
No
was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any,

every Interactive Data File required to be submitted and posted 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 and post such
files). Yes

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this

chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or
information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.

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

Large accelerated
filer

Non-accelerated
filer

(Do not check if a smaller reporting company)

Accelerated filer

Smaller reporting
company

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange

Act). Yes

The aggregate market value of the voting and non-voting common stock held by non-affiliates of the registrant as of the

last business day of the registrant’s most recently completed second fiscal quarter was $629,477,368.

As of March 7, 2016, the number of outstanding shares of the registrant’s common stock, par value $0.01 per share, was

38,257,381.

DOCUMENTS INCORPORATED BY REFERENCE

Specified portions of the registrant’s proxy statement with respect to the 2016 Annual Meeting of Shareholders to be held
June 9, 2016, which is to be filed pursuant to Regulation 14A within 120 days after the end of the registrant’s fiscal year ended
December 31, 2015, are incorporated by reference into Part III of this Form 10-K.

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K contains forward-looking statements within the meaning of Section 27A of the
Securities Act of 1933, or the Securities Act, and Section 21E of the Securities Exchange Act of 1934, or the Exchange Act,
which are subject to the “safe harbor” created by those sections for such statements. Forward-looking statements are based on
our management’s beliefs and assumptions and on information currently available to our management. All statements other
than statements of historical fact are “forward-looking statements.” Terms such as “anticipate,” “believe,” “could,” “estimate,”
“expect,” “goal,” “intend,” “may,” “plan,” “potential,” “predict,” “project,” “should,” “will,” “would,” and similar expressions
and variations thereof are intended to identify forward-looking statements, but these terms are not the exclusive means of
identifying such statements. Examples of these statements include, but are not limited to, statements regarding:

•

our plans for sales, marketing and distribution of OMIDRIA® (phenylephrine and ketorolac injection) 1%/0.3%;
our expectations regarding our product sales and our estimate regarding how long our existing cash, cash equivalents,
short-term investments and revenues will be sufficient to fund our anticipated operating expenses, capital expenditures
and interest and principal payments on our outstanding notes under our Loan and Security Agreement, or the Oxford/
EWB Loan Agreement, with Oxford Finance LLC, or Oxford, and East West Bank, or EWB;

our ability to raise additional capital through the capital markets, including under our at-the-market equity facility with
JonesTrading Institutional Services LLC, or JonesTrading, or through one or more corporate partnerships, equity
offerings, debt financings, collaborations, licensing arrangements or asset sales;

our ability to forecast accurately wholesaler demand as well as our estimates of chargebacks and rebates, distribution
fees and estimated product returns;

our ability to enter into acceptable arrangements with potential corporate partners, including with respect to
OMIDRIA;

our expectations regarding the clinical, therapeutic and competitive benefits of OMIDRIA and our product candidates;

our anticipation that we will rely on contract manufacturers to manufacture OMIDRIA for commercial sale and to
manufacture our product candidates and our expectations regarding product supply and manufacturing of OMIDRIA;

our expectations about the commercial competition that OMIDRIA and our product candidates, if commercialized,
may face;

our expectation that the OMIDRIAssure™ Reimbursement Services Program will increase patient access to
OMIDRIA;

our expectations regarding cost impacts resulting from hiring sales representatives from Ventiv Commercial Services,
LLC;

the extent of protection that our patents provide and that our pending patent applications will provide, if patents issue
from such applications, for our technologies, programs, products and product candidates;

• whether the dosing limitations in our OMS824 program may be removed;

•

our ability to design and successfully complete clinical trials and other studies for our products and product candidates
and our plans and expectations regarding our clinical trials, including our clinical trials for OMS721 and for OMS824;

the expected course and costs of existing claims, legal proceedings and administrative actions, our involvement in
potential claims, legal proceedings and administrative actions, and the potential outcomes and effects of both existing
and potential claims, legal proceedings and administrative actions, as well as regulatory determinations, on our
business, prospects, financial condition and results of operations;

our expectations regarding our OMS103 exclusive license agreement including, without limitation, manufacturing and
commercialization of OMS103 and the commencement and subsequent continuation of product sales on which we
could receive royalty revenue; and

our expected financial position, performance, revenues, growth, expenses, magnitude of net losses and the availability
of resources.

Our actual results could differ materially from those anticipated in these forward-looking statements for many reasons,

including the risks, uncertainties and other factors described in Item IA of Part I of this Annual Report on Form 10-K under the
headings “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and in
our other filings with the Securities and Exchange Commission, or SEC. Given these risks, uncertainties and other factors,
actual results or developments anticipated may not be realized or, even if substantially realized, they may not have the expected
consequences to or effects on our company, business or operations. Accordingly, you should not place undue reliance on these
forward-looking statements, which represent our estimates and assumptions only as of the date of the filing of this Annual
Report on Form 10-K. You should read this Annual Report on Form 10-K completely and with the understanding that our
actual results in subsequent periods may materially differ from current expectations. Except as required by applicable law,

including the securities laws of the United States and the rules and regulations of the SEC, we assume no obligation to update
or revise any forward-looking statements contained herein, whether as a result of any new information, future events or
otherwise.

OMEROS CORPORATION
ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED DECEMBER 31, 2015

INDEX

Part I — Financial Information

Item 1. Business

Item 1A. Risk Factors

Item 1B. Unresolved Staff Comments

Item 2. Properties

Item 3. Legal Proceedings

Item 4. Mine Safety Disclosures

Part II

Item 5. Market for Registrant Common Equity, Related Shareholder Matters and Issuer Purchases of Equity
Securities

Item 6. Selected Consolidated Financial Data

Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations

Item 7A. Quantitative and Qualitative Disclosures About Market Risk

Item 8. Financial Statements and Supplementary Data

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosures

Item 9A. Controls and Procedures

Item 9B. Other Information

Part III

Item 10. Directors, Executive Officers, and Corporate Governance

Item 11. Executive Compensation

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Shareholder Matters

Item 13. Certain Relationships and Related Transaction, and Directors' Independence

Item 14. Principal Accounting Fees and Services

Part IV -- Financial Information

Item 15. Exhibits, Financial Statement Schedules

Signatures

Page
6

45
47

PART I

This Annual Report on Form 10-K contains forward-looking statements reflecting our current expectations that involve
risks and uncertainties. Actual results may differ materially from those discussed in these forward-looking statements due to a
number of factors, including those set forth in the section entitled “Risk Factors” and elsewhere in this Annual Report. Please
refer to the special note regarding forward-looking statements at the beginning of this Annual Report on Form 10-K for further
information.

ITEM 1.

BUSINESS

Overview

We are a biopharmaceutical company committed to discovering, developing and commercializing both small-
molecule and protein therapeutics for large-market as well as orphan indications targeting inflammation, coagulopathies
and disorders of the central nervous system.

Our marketed drug product OMIDRIA® (phenylephrine and ketorolac injection) 1%/0.3% was broadly launched in
the U.S. in April 2015 for use during cataract surgery or intraocular lens, or IOL, replacement. OMIDRIA is derived from
our proprietary PharmacoSurgery® platform, which is designed to improve clinical outcomes of patients undergoing
ophthalmological, arthroscopic, urological and other surgical procedures. Our proprietary PharmacoSurgery platform is
based on low-dose combinations of U.S. Food and Drug Administration-approved, or FDA-approved, therapeutic agents
delivered directly to the surgical site throughout the duration of the procedure to inhibit preemptively inflammation and
other problems caused by surgical trauma and to provide clinical benefits both during and after surgery. We expect that our
near-term efforts will be focused on marketing and selling OMIDRIA commercially in the U.S. and expanding patient
access to the drug.

In our pipeline we have clinical-stage development programs focused on: complement-related thrombotic

microangiopathies; complement-mediated glomerulopathies; Huntington’s disease and cognitive impairment; addictive and
compulsive disorders; and problems associated with urologic surgical procedures. In addition, we have a diverse group of
preclinical programs and two additional platforms: one capable of unlocking new G protein-coupled receptor, or GPCR,
drug targets and the other used to generate antibodies. For OMIDRIA and each of our product candidates and our
programs, other than OMS103, we have retained control of all commercial rights.

PharmacoSurgery® Platform

We believe that current standards of care for the management and treatment of surgical trauma are limited in
effectiveness. Surgical trauma causes a complex cascade of molecular signaling and biochemical changes, resulting in
inflammation, pain, pupil constriction, muscle spasm, loss of function and other problems. As a consequence, multiple
pharmacologic actions are required to manage the complexity and inherent redundancy of the cascade. Accordingly, we
believe that single-agent treatments acting on single targets do not result in optimal therapeutic benefit. Further, current
preoperative treatments are not optimally effective because the administration of standard irrigation solution during the
surgical procedure washes out preoperatively delivered drugs. In addition, current postoperative therapies are not optimally
effective because the cascade and resultant inflammation, pain, pupil constriction, muscle spasm, loss of function and other
problems have already begun and are difficult to reverse and manage after surgical trauma has occurred. Also, drugs that
currently are delivered systemically to target these problems, such as by oral or intravenous administration, are frequently
associated with adverse side-effects.

In contrast, we generate from our PharmacoSurgery platform proprietary products, such as OMIDRIA, and product
candidates that are combinations of therapeutic agents designed to act simultaneously at multiple discrete targets to block
preemptively the molecular-signaling and biochemical cascade caused by surgical trauma and to provide clinical benefits
both during and after surgery. These products and product candidates are supplied in pre-dosed, pre-formulated, single-use
containers and added to standard surgical irrigation solutions, delivered intraoperatively to the site of tissue trauma
throughout the surgical procedure. This is expected to result in the delivery of low concentrations of agents with minimal
systemic uptake and reduced risk of adverse side-effects and does not require a surgeon to change his or her operating
routine.

OMIDRIA® (phenylephrine and ketorolac injection) 1%/0.3%

Overview. OMIDRIA is approved by the FDA for use during cataract surgery or IOL replacement to maintain pupil

size by preventing intraoperative miosis (pupil constriction) and to reduce postoperative ocular pain, and is approved in all
EU member states plus Iceland, Lichtenstein and Norway for use during cataract surgery and other IOL replacement

procedures to maintain mydriasis (pupil dilation), to prevent miosis (pupil constriction), and to reduce postoperative eye
pain. OMIDRIA is a proprietary drug product containing two active pharmaceutical ingredients, or APIs: ketorolac, an anti-
inflammatory agent, and phenylephrine, a mydriatic, or pupil dilating, agent. FDA-approved drugs containing each of these
APIs have been used in ophthalmological clinical practice for more than 20 years, and both APIs are contained in generic,
FDA-approved drugs. Cataract and other lens replacement surgery involves replacement of the original lens of the eye with
an artificial intraocular lens. These procedures are typically performed to replace a lens opacified by a cataract or to correct
a refractive error. OMIDRIA is added to standard irrigation solution used during cataract and lens replacement surgery and
is delivered intracamerally, or within the anterior chamber of the eye, to the site of the surgical trauma throughout the
procedure. Preventing pupil constriction is essential for these procedures and, if miosis occurs, the risk of damaging
structures within the eye and other complications increases as does the operating time required to perform the procedure.

United States. We broadly launched OMIDRIA in the U.S. in April 2015 primarily through wholesalers which, in
turn, sell to ambulatory surgery centers, or ASCs, and hospitals. The Centers for Medicare and Medicaid Services, or CMS,
has granted transitional pass-through reimbursement status for OMIDRIA, which we expect to run until January 1, 2018.
Pass-through status allows for separate payment (i.e., outside the bundled payment) under Medicare Part B for new drugs
and other medical technologies that meet well-established criteria specified by federal regulations governing Medicare
spending. Coverage for OMIDRIA has been confirmed for 100% of Medicare Administrative Contractors across all U.S.
states and Puerto Rico. We have also confirmed coverage for OMIDRIA with nearly all of the 30 largest commercial third-
party payers in the U.S. as well as a large number of regional commercial payers.

We believe that every patient, surgeon and facility should be able to access OMIDRIA. To that end, we have entered
into agreements to enable discounts that do not affect average selling price, or ASP, on qualifying purchases of OMIDRIA
by certain U.S. government purchasers and other eligible entities (e.g., 340B-eligible hospitals and clinics). In addition, in
October 2015 we launched the OMIDRIAssure™ Reimbursement Services Program, or OMIDRIAssure. The
OMIDRIAssure program services include the:

• OMIDRIAssure Information Hotline for physicians and facilities seeking personalized help and information on

OMIDRIA coverage and reimbursement for patients;

•

“Equal Access” Patient Assistance Program providing assistance to financially eligible uninsured or
government-insured patients; and

“We Pay the Difference” Commercial Reimbursement Program providing assistance to patients with
insufficient commercial insurance.

The OMIDRIAssure coverage and reimbursement support services for surgeons and facilities remove uncertainties about
coding, billing, and coverage of OMIDRIA. The “Equal Access” Patient Assistance and the “We Pay the Difference”
Commercial Reimbursement Programs remove patients’ financial barriers to accessing the drug. Under the “Equal Access”
program, financially eligible uninsured and government-insured patients receive OMIDRIA free of charge for use during
surgery. For commercially insured patients, through our “We Pay the Difference” program we pay the facility, on behalf of
the patient, the difference between the facility’s acquisition cost for OMIDRIA and the amount covered by the patient's
insurance.

European Union and other International Territories. In July 2015, we received approval from the European
Commission, or EC, to market OMIDRIA in all EU member states plus Iceland, Lichtenstein and Norway for use during
cataract surgery and other IOL replacement procedures to maintain mydriasis (pupil dilation), to prevent miosis (pupil
constriction), and to reduce postoperative eye pain. Decisions about price and reimbursement for OMIDRIA are made on a
country-by-country basis and will be required before marketing may occur in a particular country. We do not expect to see
sales of OMIDRIA in the EU and other international territories if we do not obtain such pricing and/or reimbursement
decisions or if we are unable to enter into partnerships for the marketing and distribution of OMIDRIA. Timing of any such
partnerships depends on numerous factors, including domestic sales of OMIDRIA.

Pediatric Studies. We have initiated a pediatric study for OMIDRIA in the U.S. and have discussed with the

European Medicines Agency, or EMA, the design for a pediatric study for OMIDRIA in the EU, each of which may afford
Omeros an additional six months of exclusivity in the U.S. and the EU, respectively, if completed in accordance with
agreements with the respective regulatory agencies.

Abbreviated New Drug Application. In July 2015, we received a Notice Letter from Par Pharmaceutical, Inc. and its

subsidiary, Par Sterile Products, LLC, or collectively, Par, that Par had filed with the FDA an Abbreviated New Drug
Application, or ANDA, containing a Paragraph IV Certification under the Hatch-Waxman Act seeking approval to market a
generic version of OMIDRIA prior to the expiration of three patents listed in the Orange Book for OMIDRIA, or the
Orange Book Patents. These patents were granted following review by the U.S. Patent and Trademark Office, are presumed

to be valid under governing law, and can only be invalidated in federal court with clear and convincing evidence. We have
reviewed the assertions in Par’s Paragraph IV Notice Letter and believe that they do not have merit. We intend to enforce
vigorously our intellectual property rights relating to OMIDRIA, including the three patents referenced in Par’s Paragraph
IV Notice Letter, as well as a fourth patent that issued after Par’s Notice Letter in which all alleged prior art referenced by
Par in its Notice Letter was cited and considered by the U.S. Patent and Trademark Office before issuance of the fourth
patent, and additional patents that may issue from currently pending patent applications. Following receipt of the Paragraph
IV Notice Letter, in September 2015 we filed a patent infringement lawsuit in the U.S. District Court for the District of
Delaware against Par. For more information regarding this ANDA, see “Governmental Regulation-Abbreviated New Drug
Application”, and for more information regarding our patent infringement lawsuit against Par, see Part I, Item 3, “Legal
Proceedings.”

OMS103-Arthroscopy

OMS103, derived from our PharmacoSurgery platform, was developed for use during all arthroscopic procedures,

including knee and shoulder arthroscopy, and completed Phase 3 trials in patients undergoing arthroscopic anterior cruciate
ligament reconstruction and arthroscopic partial meniscectomy. OMS103 is a proprietary combination of anti-
inflammatory/analgesic APIs, specifically amitriptyline, ketoprofen and oxymetazoline, each with well-known safety and
pharmacologic profiles, and was designed to provide a multimodal approach to block preemptively the inflammatory
cascade induced by arthroscopy. Each of the APIs are components of generic, FDA-approved drugs that have been
marketed in the U.S. as over-the-counter, or OTC, or prescription drug products for over 20 years and have established and
well-characterized safety profiles. One of the major challenges facing orthopedic surgeons performing arthroscopic
procedures is adequately controlling the local inflammatory response to surgical trauma, particularly the inflammatory pain
and swelling that are associated with detrimental effects on the long-term health of the joint. Added to standard irrigation
solutions, OMS103 is delivered directly to the joint throughout arthroscopy and is designed to act simultaneously at
multiple distinct targets to block preemptively the inflammatory cascade induced by arthroscopic surgery.

In June 2015, we entered into an exclusive licensing agreement, or the OMS103 Agreement, with Fagron

Compounding Services, LLC, d/b/a Fagron Sterile Services, and JCB Laboratories, LLC, or collectively Fagron, an FDA-
registered human drug outsourcing facility, under which Fagron is obligated to produce under Good Manufacturing
Practice, or GMP, and to commercialize OMS103 in the U.S. Fagron has not performed its performance diligence
obligations under the OMS103 Agreement, including initiating sales, and we are currently evaluating our options regarding
the OMS103 Agreement and our OMS103 program. For a more detailed description of this agreement, see “License and
Development Agreements.”

Our Product Candidates and Development Programs

Our product candidates and pipeline of development programs consist of the following:

Targeted
Procedure/Disease

Development
Status

Next Expected
Milestone

Worldwide
Rights

Product Candidate/Program
Clinical Programs
MASP-2 (OMS721) -
Lectin Pathway Disorders

MASP-2 (OMS721) -
Lectin Pathway Disorders

Phase 3

Initiate Phase 3 Enrollment

Phase 2

Complete Phase 2 Trial

Atypical Hemolytic Uremic
Syndrome (aHUS)

Thrombotic Microangiopathies
(TMAs), including
Hematopoietic Stem-Cell
Transplant-Related TMAs and
Thrombotic Thrombocytopenic
Purpura (TTP)

MASP-2 (OMS721) -
Lectin Pathway Disorders

IgA Nephropathy and Other
Renal Diseases

Phase 2

Complete Phase 2 Trial

PDE10 (OMS824) - CNS
Disorders

Addiction

Huntington’s Disease

Phase 2

Schizophrenia

Phase 2 (1)

Begin Enrollment in
Redesigned Phase 2 Clinical
Trials
Submit Phase 2 Clinical Trial
Protocol to FDA

Opioid and Nicotine Addiction

Phase 2

Analyze Phase 2 Data

Omeros

OMS201 - Urology

Ureteroscopy

Phase 1/2

Determine
Commercialization Path

Omeros

Omeros (In-
licensed)

Omeros

Product Candidate/Program
Preclinical Programs
PDE7 (OMS527)

Targeted
Procedure/Disease

Development
Status

Next Expected
Milestone

Worldwide
Rights

Addictions and Compulsive
Disorders; Movement Disorders

Preclinical

Complete Human Dose-
Enabling Toxicology Studies
and GMP Manufacturing

Omeros
(Compounds
In-licensed)

Plasmin (OMS616)

Surgical and Traumatic
Bleeding

Preclinical

MASP-3 (OMS906) -
Alternative Pathway
Disorders

Paroxysmal nocturnal
hemoglobinuria (PNH) and
Other Alternative Pathway
Disorders

Preclinical

GPR17 - CNS Disorders

Demyelinating Disorders

Preclinical

GPR101 - Metabolic
Disorders

Appetite and Eating Disorders

Preclinical

GPR151 - CNS Disorders

Neuropathic Pain and
Cognition

Preclinical

GPR161 - Cancer

Triple-Negative Breast Cancer

Preclinical

GPR174 - Immune
Disorders

Dysfunction of Regulatory

Preclinical

GPR183 - Skeletal and
Infectious Diseases

Osteoporosis and EBV-Related
Diseases

Preclinical

GPCR Platform

Antibody Platform

CNS, Metabolic, CV,
Oncologic, Musculoskeletal &
Other Disorders

Preclinical

Metabolic, CV, Oncologic,
Musculoskeletal & Other
Disorders

Preclinical

Complete Human Dose-
Enabling Toxicology Studies
and GMP Manufacturing

Complete Manufacturing
Scale-up of a Clinical
Candidate for IND-Enabling
Toxicology Studies

Complete in vivo Proof-of-
Concept Studies and
Compound Optimization

Complete in vivo Proof-of-
Concept Studies and
Compound Optimization
Complete in vivo Proof-of-
Concept Studies and
Compound Optimization

Complete in vivo Proof-of-
Concept Studies and
Compound Optimization

Continue Drug Discovery
and Selected Medicinal
Chemistry for Class A
Orphan and Class B GPCRs

Continue Developing
Antibodies Targeting Lectin
and Alternative Pathway of
Complement System and
Expanding Antibody Library

Omeros (In-
licensed)

Omeros

Omeros (In-
licensed)

(1) Clinical trials evaluating OMS824 in schizophrenia were previously suspended at the request of the FDA and, given that we have
not yet submitted a Phase 2 clinical trial protocol to FDA for review, remain suspended. For additional information, see “Clinical
Programs-PDE10 Programs-OMS824 for Huntington’s Disease and Schizophrenia.”

Clinical Programs

MASP-2 Program - OMS721 - Lectin Pathway Disorders

Overview. Mannan-binding lectin-associated serine protease-2, or MASP-2, is a novel pro-inflammatory protein
target involved in activation of the complement system, which is an important component of the immune system. The
complement system plays a role in the inflammatory response and becomes activated as a result of tissue damage or trauma
or microbial pathogen invasion. Inappropriate or uncontrolled activation of the complement system can cause diseases
characterized by serious tissue injury. MASP-2 is recognized as the effector enzyme, and is required for the function, of the
lectin pathway, one of the principal complement activation pathways. Importantly, inhibition of MASP-2 does not appear to
interfere with the antibody-dependent classical complement activation pathway, which is a critical component of the
acquired immune response to infection. We are developing MASP-2 antibodies and small molecules and we expect that the
intended therapeutic effect can be achieved through multiple routes of administration, including subcutaneous and
intravenous administration of our antibodies and oral and intravenous administration of our small molecules. OMS721 is
our lead human monoclonal antibody targeting MASP-2. OMS721 has received Orphan Drug designation for the

prevention (inhibition) of complement-mediated TMAs, and Fast Track designation for the treatment of patients with
aHUS.

OMS721 is being developed for diseases in which the lectin pathway is believed to contribute to significant tissue

injury and pathology. One group of such diseases is TMAs, including aHUS, TTP and hematopoietic stem-cell transplant,
or HSCT, -related TMA. These diseases are typically characterized by significant kidney or central nervous system injury
when not treated. We recently initiated a Phase 3 clinical program in patients with aHUS and are currently conducting two
Phase 2 clinical programs, one in patients with TMAs (i.e., HSCT-related TMA and TTP) and a second in patients with
immunoglobulin A, or IgA, nephropathy and other complement-related renal diseases (e.g., membranous nephropathy,
lupus nephritis and C3 glomerulopathy).

The Phase 3 program consists of one clinical trial - a single-arm (i.e., no control arm), open-label trial in patients with

newly diagnosed or ongoing aHUS. The clinical package for the Biologics License Application, or BLA, will be similar to
that which formed the basis of approval for Soliris® (eculizumab). We also received agreement from FDA on our ongoing
manufacturing for both the Phase 3 program and commercialization of OMS721 as well as on our nonclinical safety and
toxicology plan, most of which has already been successfully completed with no significant adverse findings. We expect
that Phase 3 enrollment will begin later this year and that patients currently being treated in the Phase 2 trial will be
included in the Phase 3 program. We plan to pursue accelerated approval from the FDA for OMS721 in aHUS.

In addition to TMAs and renal disease, many other disorders have evidence of lectin pathway injury, and we plan to

evaluate OMS721 in one or more of them.

Clinical Trial Results. The first OMS721 Phase 2 clinical trial is evaluating the effects of the drug on patients with

complement-mediated TMAs. This trial consists of three stages. The first stage is a three-level dose-ranging stage, and
patient dosing has been completed. The second and third stages are fixed-dose stages and are currently in progress.
Initially, the Phase 2 TMA program included aHUS, HSCT-related TMA and TTP patients. Following a recent meeting
with the FDA, a Phase 3 clinical program was initiated in aHUS patients. The Phase 2 TMA program has continued,
focused on HSCT-related TMA and TTP patients.

In February 2015, we announced the completion of dosing of the low-dose cohort of patients in Stage 1 of the Phase

2 clinical trial. This first cohort consisted of three aHUS patients treated with the lowest dose of OMS721. All patients in
this study cohort received OMS721 and improvements were observed in TMA disease markers.

In August 2015, we announced positive data from the mid- and high-dose cohorts in the dose-ranging stage of our
Phase 2 clinical trial for the treatment of TMAs with consistent and robust improvement in efficacy measures. As in the
low-dose cohort, OMS721 was well tolerated by all patients in the mid- and high-dose cohorts throughout the treatment
period. In the mid-dose cohort, the two patients with plasma therapy-resistant aHUS demonstrated clinically meaningful
improvements in blood measures of aHUS activity.

The high-dose cohort enrolled two aHUS patients. One was plasma therapy-resistant with additional complicating
disorders including hepatitis C, cryoglobulinemia and lymphoma. Prior to OMS721 treatment, the patient required repeated
dialysis. Throughout treatment and through follow-up, the patient remained off dialysis. Hematological and renal
parameters showed substantial improvement. The other patient was plasma therapy-responsive. She required plasma
therapy twice weekly. The patient’s aHUS flared when she attempted to decrease her plasma therapy to once weekly.
Following treatment with OMS721, the patient’s aHUS remitted and she has remained stable on plasma therapy once
weekly. Two patients with HSCT-related TMA were enrolled in the high-dose cohort of Stage 1 of the Phase 2 clinical trial.
One patient has a history of lymphoma and underwent HSCT complicated by a number of life-threatening disorders,
including TMA. The patient showed significant improvement in TMA disease markers following OMS721 treatment. One
other patient with HSCT-associated TMA enrolled in the high-dose cohort of Stage 1. This patient enrolled in the trial when
his renal function had severely deteriorated. He discontinued the study early when no improvement in disease markers was
observed.

There have been multiple requests from investigators and other physicians for expanded access to OMS721,
including two study patients suffering from aHUS and access to OMS721 for compassionate use was provided. One of
these patients was on dialysis, but was not eligible for kidney transplant because her aHUS was active. Her condition
stabilized on OMS721 and her investigator considers her eligible for transplantation. Another physician, in Finland, has
requested compassionate use of OMS721 for a patient with aHUS who did not respond adequately to Soliris® and we have
agreed to make OMS721 available for this patient.

In addition to the Phase 3 clinical program in patients with aHUS, two Phase 2 clinical programs are enrolling: one in

TMAs and the other in complement-related renal diseases, including IgA nephropathy.

Other Studies. We have completed a series of in vivo studies using either proprietary MASP-2 knock-out mice and/or

MASP-2 antibodies in established models of disease that are linked to activation of the complement system. Our findings
in those studies suggest that antibody-blockade of MASP-2 may have a preventive or therapeutic effect in the treatment of
a wide range of complement-related diseases and disorders, including TMAs (e.g., aHUS, HSCT-related TMA, TTP) and
renal diseases, which are the disorders targeted by our first Phase 3 clinical program and one of our two Phase 2 clinical
trials. In addition, we have generated positive preclinical data in in vivo models of age-related macular degeneration, or
AMD, myocardial infarction, diabetic neuropathy, stroke, ischemia-reperfusion injury, and other diseases and disorders.

Licensing Arrangements. We hold worldwide exclusive licenses to rights related to MASP-2, the antibodies targeting

MASP-2 and the therapeutic applications for those antibodies from the University of Leicester, from its collaborator,
Medical Research Council at Oxford University, or MRC, and from Helion Biotech ApS, or Helion. For a more detailed
description of these licenses, see “License and Development Agreements.”

PDE10 Programs - OMS824 for Huntington’s Disease and Schizophrenia

Overview. Phosphodiesterase 10, or PDE10, is an enzyme that is expressed in areas of the brain strongly linked to
diseases that affect cognition, including Huntington’s disease and schizophrenia. Cognitive dysfunction occurs early in
these diseases and is responsible for substantial disability. PDE10 inhibitors have been shown to be effective in multiple
animal models of behavior and cognition, and there remain substantial unmet clinical needs with current treatments. Our
proprietary compound OMS824 inhibits PDE10 and is being developed in clinical programs for the treatment of cognitive
disorders, including Huntington’s disease and schizophrenia. In Huntington’s disease, OMS824 may improve motor and
behavioral abnormalities as well as cognition. In schizophrenia, OMS824 may have, in addition to cognitive enhancement,
beneficial effects on the positive (e.g., hallucinations) and negative (e.g., flat affect) symptoms of the disease. OMS824
may address other limitations of current treatments for both schizophrenia and Huntington’s disease, for example, by
avoiding the weight gain, hyperlipidemia, and the risk of sudden cardiac death associated with current antipsychotic
medications as well as the depression and suicidal ideation seen with tetrabenazine, the only FDA-approved treatment for
Huntington’s disease.

OMS824 has received Orphan Drug designation for the treatment of Huntington’s disease and Fast Track designation

for the treatment of cognitive impairment in patients with Huntington’s disease.

Clinical Trials. OMS824 is in a Phase 2 clinical program for the treatment of Huntington’s disease and a Phase 2
clinical program evaluating OMS824 for the treatment of schizophrenia. Clinical trials in our Huntington’s program are
currently subject to dosing limitations. The dosing limitations may potentially be removed pending generation, submission
and FDA review of additional information. We are conducting nonclincal studies to generate additional data for further
discussion with the FDA regarding the dosing limitations and are currently preparing for a re-designed Phase 2 clinical trial
in patients with Huntington’s disease.

In our schizophrenia program, we have completed a Phase 2a trial evaluating OMS824’s tolerability, safety,
pharmacokinetics, potential interactions with concomitant antipsychotic medications, and potential effects on cognition
using a battery of cognitive tests in patients with schizophrenia. The drug was well tolerated in this trial and demonstrated
comparable systemic pharmacokinetics when administered alone and concomitantly with approved antipsychotic agents.
As we announced in October 2014, clinical trials evaluating OMS824 in schizophrenia are suspended currently at the
request of the FDA. Given that there was no active schizophrenia trial at the time of program suspension, the FDA will
address the OMS824 schizophrenia program when we have a related trial protocol ready for initiation.

Funding Agreement with The Stanley Medical Research Institute. Our preclinical development of OMS824 was
supported by funds from The Stanley Medical Research Institute, or SMRI, a non-profit corporation that supports research
on the causes and treatment of schizophrenia and bipolar disorder. For a more detailed description of our agreement with
SMRI, see “License and Development Agreements.”

Program - OMS405

Overview. In our peroxisome proliferator-activated receptor gamma, or PP

program, we are developing

proprietary compositions that include PP
which may include opioids, nicotine and alcohol. We believe that Omeros is the first to demonstrate a link between PP
and addiction disorders. Data from European pilot clinical studies and animal models of addiction suggest that PP
agonists could be efficacious in the treatment of a wide range of addictions.

agonists for the treatment and prevention of addiction to substances of abuse,

Clinical trials. Our collaborators at The New York State Psychiatric Institute have completed two Phase 2 clinical

trials related to our PP

program. These studies evaluated a PP

agonist, alone or in combination with other agents,

for treatment of addiction to opioids and to nicotine. Our collaborators are analyzing data from these trials and expect to
present relevant information in manuscripts to be published at a later date. The National Institute on Drug Abuse provided
substantially all of the funding for these clinical trials and solely oversaw the conduct of these trials. We have the right or
expect to be able to reference the data obtained from these studies for subsequent submissions to the FDA, and continue to
retain all other rights in connection with the PP

program.

Patent Assignment Agreement with Roberto Ciccocioppo, Ph.D. We acquired the patent applications and related

intellectual property rights for our PP
Camerino, Italy, pursuant to a patent assignment agreement. For a more detailed description of our agreement with
Dr. Ciccocioppo, see “License and Development Agreements.”

program in February 2009 from Roberto Ciccocioppo, Ph.D., of the Università di

OMS201-Urology

Overview. OMS201 is our PharmacoSurgery product candidate designed for use during urological procedures,
including ureterscopy for removal of ureteral or renal stones. OMS201 is a proprietary combination of ketoprofen, an anti-
inflammatory API, and nifedipine, a smooth muscle relaxant API. Each API is contained in generic, FDA-approved drugs
that have been marketed in the U.S. for more than 20 years and have well-known safety and pharmacologic profiles. Both
of these APIs have been individually prescribed to manage the symptoms of ureteral and renal stones.

Uroendoscopic procedures are performed within the urinary tract using a flexible camera device, or endoscope, and
cause tissue injury that activates local mediators of pain and inflammation, which results in inflamed tissue, pain, smooth
muscle spasm and lower urinary tract symptoms including frequency, urgency and painful urination, and can prolong
recovery. Added to standard irrigation solutions in urological surgery, OMS201 is designed for delivery directly to the
surgical site during uroendoscopic procedures, such as bladder endoscopy, or cystoscopy, minimally invasive prostate
surgery and ureteroscopy, to inhibit surgically induced inflammation, pain and smooth muscle spasm, or excess
contractility.

In 2010, we completed a Phase 1/Phase 2 clinical trial in 24 patients designed to evaluate the safety and systemic
absorption of two sequentially higher concentrations of OMS201 added to standard irrigation solution and delivered to
patients undergoing ureteroscopy for removal of ureteral or renal stones. OMS201 was well tolerated in this study. The next
step in our OMS201 program is to design a Phase 2 clinical program; however, the program is on hold given current
availability of clinical development resources. We are evaluating alternative approaches to make OMS201 commercially
available, such as through a registered outsourcing facility without the need to conduct any additional clinical trials.

Preclinical Programs

PDE7 Program - OMS527

Overview. Our phosphodiesterase 7, or PDE7, program is based on our discoveries of previously unknown links

between PDE7 and any addiction or compulsive disorder and between PDE7 and any movement disorders, such as
Parkinson’s disease. PDE7 appears to modulate the dopaminergic system, which plays a significant role in regulating both
addiction and movement. We believe that PDE7 inhibitors could be effective therapeutics for the treatment of addiction and
compulsive disorders as well as for movement disorders. Data generated in preclinical studies support the use of PDE7
inhibitors in both of these therapeutic areas. We have selected a clinical candidate and are preparing to initiate toxicology
studies under good laboratory practices, or GLP, intended to support the submission of an Investigational New Drug
application, or IND, or clinical trial application, or CTA, and subsequent clinical trials.

Exclusive License Agreement with Daiichi Sankyo Co., Ltd. We hold an exclusive license to certain PDE7 inhibitors

claimed in patents and pending patent applications owned by Daiichi Sankyo Co., Ltd. (successor-in-interest to Asubio
Pharma Co., Ltd.), or Daiichi Sankyo, for use in the treatment of movement, addiction and compulsive disorders as well as
other specified indications. For a more detailed description of our agreement with Daiichi Sankyo, see “License and
Development Agreements.”

Plasmin Program - OMS616

Overview. In our plasmin program, we are advancing novel antifibrinolytic agents for the control of blood loss during
surgery or resulting from trauma as well as for other hyperfibrinolytic states (e.g., liver disease). Excessive bleeding during
cardiac or trauma surgery is known to increase overall morbidity and mortality. In an attempt to control this bleeding,
patients undergoing cardiac and other extensive surgery often receive antifibrinolytic compounds. These drugs inhibit
plasmin, an enzyme present in blood that degrades fibrin clots. Because plasmin degrades fibrin clots, an agent that inhibits
plasmin may have potential utility for reducing blood loss due to trauma or surgery.

Prior to withdrawal from the U.S. and European markets in 2008 for safety concerns, the antifibrinolytic Trasylol®

(aprotinin) had been shown in a number of studies to be more effective at reducing blood loss than the other two most
commonly used antifibrinolytics on the market today, tranexamic acid and epsilon aminocaproic acid. While Trasylol® is a
potent inhibitor of plasmin, it is non-selective. In addition to plasmin, it significantly inhibits kallikrein and Factor XIa, two
enzymes important in promoting clotting, and their inhibition can increase bleeding. Trasylol® was found to be associated
with a number of safety issues, including increased mortality. Further, it is a bovine protein associated with anaphylactic
reactions. While the specific cause of increased death remains unknown, an often-cited explanation is the lack of specificity
of Trasylol®.

Our proprietary agents also inhibit plasmin but, unlike Trasylol®, they do not significantly inhibit kallikrein or Factor

XIa. Additionally, our agents are derived from human protein, which may reduce immunological side effects. The
properties of our proprietary agents are described in a peer-reviewed article titled “Engineering Kunitz Domain 1 (KD1) of
Human Tissue Factor Pathway Inhibitor-2 to Selectively Inhibit Fibrinolysis: Properties of KD1-L17R Variant” that was
published in the February 11, 2011 issue of the Journal of Biological Chemistry. We believe that the potential efficacy,
human-protein derivation and improved selectivity of our proprietary agents provide a novel approach to the control of
bleeding from surgery and trauma.

We are in the process of manufacturing preclinical supplies to enable the initiation of GLP toxicology studies

intended to support the submission of an IND or CTA and subsequent clinical trials. Ex vivo studies in human plasma
comparing the efficacy of our lead clinical candidate to that of Trasylol® in inhibiting plasmin demonstrated that, in these
studies, our candidate was at least as effective as Trasylol®. Given that our molecule is (1) a human-derived protein rather
than bovine-derived as is Trasylol® and (2) does not have the off-target activity seen with Trasylol® against kallikrein and
Factor XIa, we expect that our molecule will compare favorably to Trasylol® with respect to safety. This expectation will
need to be borne out by clinical trials.

Exclusive License Agreement with The Regents of the University of California. We hold a worldwide exclusive

license to patent rights related to certain antifibrinolytics from The Regents of the University of California. For a more
detailed description of this agreement, see “License and Development Agreements.”

MASP-3 Program - OMS906 - Alternative Pathway Disorders

Overview. As part of our MASP program, we have identified mannan-binding lectin-associated serine protease-3, or
MASP-3, as what we believe is the key activator of the alternative pathway of the complement system, and we believe that
we are the first to make this and related discoveries associated with the alternative pathway. The complement system is part
of the immune system’s innate immune response, and the alternative pathway is considered the amplification loop within
the complement system. Based on our alternative pathway-related discoveries, we have expanded our intellectual property
position to protect our inventions stemming from these discoveries beyond MASP-2-associated inhibition of the lectin
pathway to include inhibition of the alternative pathway. In addition to our MASP-2 inhibitors of the lectin pathway, we are
developing inhibitors of the alternative pathway as well as bispecific inhibitors of both the alternative and lectin pathways.
For each of these targets, our efforts are directed to both antibody and small-molecule development.

We are currently developing MASP-3 inhibitors for the treatment of disorders related to the alternative pathway of
the complement system and are optimizing potent and functionally active antibodies in preparation for scale-up of one or
more clinical candidates. We believe that MASP-3 inhibitors may have the potential to treat subjects suffering from a wide
range of diseases and conditions, including paroxysmal nocturnal hemoglobinuria, or PNH, asthma, traumatic brain injury,
AMD, disseminated intravascular coagulation, arthritis, dense deposit disease, aspiration pneumonia, neuromyelitis optica,
pauci-immune necrotizing crescentic glomerulonephritis, endophthalmitis and Behcet’s disease.

Licensing Arrangements. We jointly own and hold worldwide exclusive license rights related to therapeutic

applications for inhibiting MASP-3 from the University of Leicester. For a more detailed description of these licenses, see
“License and Development Agreements.”

GPCR Platform

Overview. GPCRs comprise one of the largest families of proteins in the genomes of multicellular organisms. It is

estimated that there are over 1,000 GPCRs in the human genome, comprising three percent of all human proteins. GPCRs
are cell surface membrane proteins involved in mediating both sensory and nonsensory functions. Sensory GPCRs are
involved in the perception of light, odors, taste and sexual attractants. Non-sensory GPCRs are involved in metabolism,
behavior, reproduction, development, hormonal homeostasis and regulation of the central nervous system. The vast
majority of GPCR drug targets are non-sensory. Although GPCRs form a super-family of receptors, individual GPCRs

display a high degree of specificity and affinity for the functionally active molecules, or ligands, that bind to a given
receptor. Ligands can either activate the receptor (agonists) or inhibit it (antagonists and inverse agonists). When activated
by its ligand, the GPCR interacts with intracellular G proteins, resulting in a cascade of signaling events inside the cell that
ultimately leads to the particular function linked to the receptor.

The high degree of specificity and affinity associated with GPCRs has contributed to their becoming the largest
family of drug targets for therapeutics against human diseases. It is estimated that nearly 40% of all drugs sold worldwide
target GPCRs, yet only 46 GPCRs are responsible for this wealth of drugs. Based on available data, we believe that there
are 363 human non-sensory GPCRs, of which approximately 120 have no known ligands, and we refer to those receptors
as orphan GPCRs. Without a known ligand, there is no template from which medicinal chemistry efforts can be readily
initiated nor a means to identify the GPCR’s signaling pathway and, therefore, drugs are very difficult to develop against
orphan GPCRs. “Unlocking” these orphan GPCRs by identifying one or more of their respective ligands could lead to the
development of drugs that act at these new targets. To our knowledge, despite efforts by others in the biopharmaceutical
industry and academic community, Omeros’ technology is the first commercially viable technology capable of identifying
ligands of orphan GPCRs in high throughput.

We have developed a proprietary cellular redistribution assay, or CRA, which we use in a high-throughput manner to

identify synthetic ligands, including antagonists, agonists and inverse agonists, that bind to and affect the function of
orphan GPCRs. We believe that we are the first to possess the capability to conduct high-throughput drug discovery for
orphan GPCRs and that there is no other existing high-throughput technology able to “unlock” orphan GPCRs. We have
screened Class A orphan GPCRs against our small-molecule chemical libraries using the CRA. As of February 29, 2016,
we had identified and confirmed compounds that interact with 54 of the 81 Class A orphan GPCRs linked to a wide range
of indications including cancer as well as metabolic, cardiovascular, immunologic, inflammatory and central nervous
system disorders. In addition to GPR17, discussed below, we have initiated medicinal chemistry efforts to optimize
compounds against several orphan GPCRs including: GPR101, linked to appetite and eating disorders; GPR151, linked to
neuropathic pain and cognition; GPR161, which is associated with triple negative breast cancer; GPR183, linked to
osteoporosis and to Epstein-Barr virus infections and related diseases; and GPR174, which appears to be involved in the
modulation of regulatory T cells, or “T-regs,” known to be important in autoimmune disease, such as multiple sclerosis,
and in cancer and organ transplantation.

In addition to Class A orphan GPCRs, we have also begun screening orphan and non-orphan Class B receptors. Class

B GPCRs have large extracellular domains and their natural ligands are generally large peptides, making the development
of orally active, small-molecule drugs against these receptors, such as glucagon and parathyroid hormone, a persistent
challenge. Despite the fact that oral agents are not available, the current sales for the commercialized Class B GPCR-
targeting peptide drugs are large. Our CRA technology finds functionally active small molecules for GPCRs, which we
believe could lead to the development of oral medications for many of the Class B GPCRs. While our focus to date has
remained on Class A orphan GPCRs and, as of February 29, 2016, we had identified and confirmed sets of compounds that
interact selectively with, and modulate signaling of, a small subset of Class B GPCRs, namely glucagon-like peptide-1
receptor, or GLP-1R, and parathyroid hormone 1 receptor, or PTH-1R.

GPCR Platform Funding Agreements with Vulcan Inc. and the Life Sciences Discovery Fund. In October 2010, we

entered into funding agreements for our GPCR program with Vulcan Inc. and its affiliate, which we refer to collectively as
Vulcan, and with the Life Sciences Discovery Fund Authority, a granting agency of the State of Washington, or LSDF. For
a more detailed description of these agreements, see “License and Development Agreements.”

GPR17 Program

We are conducting medicinal chemistry to optimize compounds against GPR17, a GPCR that is linked to myelin
formation. Myelin is an insulating layer rich in lipids and proteins that forms a sheath around the nerve fibers, which is
essential for the proper functioning of the nervous system. Loss of the myelin sheath is the hallmark of several diseases,
including multiple sclerosis, acute disseminated encephalomyelitis, neuromyelitis optica, transverse myelitis, chronic
inflammatory demyelinating polyneuropathy, Guillain-Barré syndrome, central pontine myelinosis and inherited
demyelinating diseases such as leukodystrophy and Charcot-Marie-Tooth disease. We believe GPR17 inhibitors have the
potential to promote remyelination and improve the outcome of these diseases as well as of traumatic brain injury and
spinal cord injury, conditions that have been associated with GPR17. Discovering GPR17 inhibitors has previously been
challenging to the pharmaceutical industry because this receptor is an orphan GPCR, i.e., its natural ligand is not known, as
discussed above. However, using our proprietary cellular redistribution assay, which allows compound screening against
orphan GPCRs without knowledge of a given receptor’s natural ligand, we have been able to identify a large number of
compounds that functionally interact with GPR17. In vivo animal studies have been conducted and others are in progress,
and we continue addition to medicinal chemistry efforts to optimize compounds against GPR17, and compound
optimization is ongoing.

GPR101 Program

We are conducting medicinal chemistry to optimize compounds against GPR101, a GPCR that is linked to appetite

and eating disorders. We believe GPR101 modulators have the potential to impact appetite and food consumption and
improve conditions such as obesity, diabetes, insulin resistance, metabolic syndrome, eating disorders (e.g., anorexia
nervosa or hyperphagia), or cachexia (also known as wasting syndrome). We have been able to identify a large number of
compounds that functionally interact with GPR101. In vivo animal studies have been conducted and others are in progress.

GPR151 Program

We are conducting medicinal chemistry to optimize compounds against GPR151, a GPCR that is linked to
neuropathic pain and cognitive disorders. We believe GPR151 modulators have the potential to improve the outcome of
individuals suffering from neuropathic pain and cognitive impairment such as memory loss, dementia, and learning
disabilities. We have been able to identify a large number of compounds that functionally interact with GPR151. In vivo
animal studies are ongoing.

GPR161 Program

We are conducting medicinal chemistry to optimize compounds against GPR161, a GPCR that is linked to triple
negative breast cancer, or TNBC, and sarcomas. We believe GPR161 modulators have the potential to improve the outcome
of individuals with TNBC, an aggressive form of breast cancer that does not express the genes for estrogen receptor,
progesterone receptor or Her2/neu. GPR161 modulators also hold promise for patients with sarcomas, such as
osteosarcoma, chondrosarcoma, and leiomyosarcoma. We have been able to identify a large number of compounds that
functionally interact with GPR161. In vivo animal studies have been conducted and others are in progress.

GPR174 Program

We are conducting medicinal chemistry to optimize compounds against GPR174, a GPCR that is linked to
autoimmunity. We believe GPR174 modulators have the potential to improve the outcome of individuals suffering from
autoimmune disorders such as multiple sclerosis, psoriasis, ulcerative colitis, systemic lupus erythematosus and rheumatoid
arthritis. We have been able to identify a large number of compounds that functionally interact with GPR174. In vivo
animal studies are in progress.

GPR183 Program

We are conducting medicinal chemistry to optimize compounds against GPR183, a GPCR that is linked to

osteoporosis and Epstein-Barr virus, or EBV, infections and associated diseases. We believe GPR183 modulators have the
potential to improve the outcome of osteoporosis as well as of individuals suffering from EBV infections and associated
diseases, such as mononucleosis, post-transplant lymphoproliferative disorders and nasopharyngeal carcinoma. We have
been able to identify a large number of compounds that functionally interact with GPR183. In vivo animal studies have
been conducted and others are in progress.

Antibody Platform

Overview. Our proprietary ex vivo platform for the discovery of novel, high-affinity monoclonal antibodies, which
was in-licensed from the University of Washington and then further developed by our scientists, utilizes a chicken B-cell
lymphoma cell line. It has successfully generated diverse antibodies that can be readily engineered. This platform offers
several advantages over other antibody platforms. The ex vivo immunizations of our proprietary cell line are significantly
more rapid than whole animal immunizations and conventional hybridoma technology. By avoiding immunization of mice
or other animals, we believe the antibodies we generate from this platform are not limited by immunological tolerance. In
addition, our platform is capable of producing novel antibodies against difficult targets, such as highly homologous
proteins, enzymes, and receptors with short extracellular domains. Chicken antibodies also have unique features that enable
binding capabilities distinct from mammalian antibodies.

We have generated antibodies to several clinically significant targets, including highly potent antibodies against

MASP-3, and our platform continues to add to our pipeline antibodies against additional important targets.

Asset Purchase Agreement with Xori Corporation. In February 2012 we entered into an Asset Purchase Agreement,

or the Xori APA, with Xori Corporation, or Xori, pursuant to which we acquired all of Xori’s rights and obligations in
certain license and material transfer agreements, intellectual property, antibodies and other assets related to our antibody
platform. We are obligated to make development and research-related milestone payments to Xori.

Exclusive License Agreement with the University of Washington. We hold a worldwide exclusive license to patent

rights related to our antibody platform from the University of Washington. For a more detailed description of this
agreement, see “License and Development Agreements.”

Sales and Marketing

Overview. We have retained all worldwide marketing and distribution rights to OMIDRIA, our product candidates

and our development programs, other than OMS103. This allows us the opportunity to market and sell independently
OMIDRIA or, if approved, any of our product candidates, to make arrangements with third parties to perform these
services for us, or both.

OMIDRIA. With respect to OMIDRIA, we have developed our own internal marketing and sales capabilities. Prior to

January 1, 2016, in the U.S. we utilized a dedicated contract sales organization. Effective January 1, 2016, we converted
the contract sales force to Omeros employees and employ 37 in-house sales representatives as of March 8, 2016. We also
use the services of Precision Lens under a commission-only arrangement to cover territories in the Midwest that are not
covered by our in-house sales force. Because surgeons specializing in cataract surgery are a sub-specialty within
ophthalmology, we believe that we can effectively access high-volume surgeons with our existing sales organization and
the services of third-party sales agents such as Precision Lens in certain territories in the U.S.

In the EU, we plan to out-license OMIDRIA marketing and distribution rights to one or more third parties that have

capabilities to promote to ophthalmologic surgeons, to facilitate distribution and reimbursement, and to manage
pharmacovigilance and clinical support. Outside of the U.S. and EU, we are exploring potential regional partnerships to
make OMIDRIA available to ophthalmologists. We have not yet entered into any agreements with third parties to market
OMIDRIA outside of the U.S. If we are unable to enter into one or more such agreements on terms acceptable to us, we
would not expect to see sales of OMIDRIA in those territories.

OMS103. Our OMS103 Agreement with Fagron requires Fagron to meet performance diligence requirements
including to bear all sales and marketing costs for U.S. sales. We have retained marketing and distribution rights for
OMS103 outside of the U.S. Fagron has not performed its performance diligence obligations under the OMS103
Agreement, including initiating sales. For a more detailed description of our agreement with Fagron and Fagron’s non-
performance, see “License and Development Agreements.”

Manufacturing, Supply and Commercial Operations

OMIDRIA. We use third parties to produce, store and distribute OMIDRIA and currently do not own or operate
manufacturing facilities. Our agreements with these third parties include confidentiality and intellectual property provisions
to protect our proprietary rights related to OMIDRIA. We require manufacturers that produce APIs and finished drug
products to operate in accordance with current Good Manufacturing Practices, or cGMPs, and all other applicable laws and
regulations.

We have agreements with Patheon Manufacturing Services, LLC (successor-in-interest to DSM Pharmaceuticals,

Inc.), or Patheon, and with Hospira Worldwide, Inc., or Hospira, pertaining to commercial supply of OMIDRIA.
Commercial manufacturing of OMIDRIA under our agreement with Patheon, or the Patheon Agreement, ceased on
December 31, 2015 in accordance with the terms of the Patheon Agreement with the exception of the final delivery of
product as further described in Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results
of Operations--Contractual Obligations and Commitments.” With respect to Hospira, we are currently completing the
manufacturing process transfer, process validation and approval of Hospira as a manufacturing site for OMIDRIA. Until
this process is complete, Hospira may not manufacture and supply OMIDRIA. We do not expect the process validation for
OMIDRIA at a Hospira facility to be completed earlier than the second half of 2016. As a result, we expect that OMIDRIA
manufacturing will be approved for production some time in the first part of 2017. We anticipated this interruption in
manufacturing and increased production of OMIDRIA prior to the break in manufacturing. We believe that we will have
sufficient supply to meet product needs until OMIDRIA product production is recommenced.

Under the agreement with Hospira, or the Hospira OMIDRIA Agreement, Hospira has agreed to manufacture and
supply, and we have agreed to purchase, a minimum percentage of our requirements of OMIDRIA for commercial sales
and clinical supplies for the development of additional therapeutic indications in the U.S. In addition, Hospira has agreed to
manufacture and supply a portion of our requirements of OMIDRIA in the EU in an amount to be mutually agreed by the
parties (not to exceed a maximum percentage of our EU requirements), with there being no minimum purchase and supply
requirement in the EU if the parties do not reach agreement during such time period and the agreement is not amended
thereafter. The Hospira OMIDRIA Agreement has an initial term of five years from the date of first commercial sale of

OMIDRIA in the U.S. or in any country in the EU, and thereafter is renewed automatically for up to two additional one-
year periods. The Hospira OMIDRIA Agreement may be terminated prior to the end of its term upon the occurrence of
certain specified events, including without limitation an uncured breach of the agreement or bankruptcy or dissolution of a
party. Upon termination of the Hospira OMIDRIA Agreement, except in the case of termination for an uncured breach by
Hospira, we will be required to purchase all of Hospira’s inventory of OMIDRIA and, if applicable, all work-in-progress
inventory and to reimburse Hospira for all supplies purchased or ordered based on firm purchase orders or our estimates of
its requirements of OMIDRIA.

We have used multiple suppliers for the OMIDRIA APIs. Given the large amount of these APIs manufactured

annually by these and other suppliers, and the quantities of these APIs we have on hand, we anticipate that we will be
capable of addressing our commercial API supply needs for OMIDRIA. We have not yet signed commercial agreements
with suppliers for the supply of all of our anticipated commercial quantities of these APIs for OMIDRIA, although we may
elect to do so in the future.

In the U.S., we sell OMIDRIA through a limited number of wholesalers that distribute the product to ASCs and

hospitals. Title transfers upon delivery of OMIDRIA to the wholesaler. We use a single third-party logistics provider to
handle warehousing of our commercial supply of OMIDRIA in the U.S. and to ship OMIDRIA to our wholesalers. Our
third-party logistics provider also performs certain support services on our behalf. Nearly all of our revenues for the fiscal
year ended December 31, 2015 were generated from OMIDRIA product sales in the U.S. Three of our major distributors -
AmerisourceBergen Corporation, Cardinal Health, Inc., and McKesson Corporation - together with entities under their
common control each accounted for 10% or more of our total revenue in 2015.

Product Candidates and OMS103. We have laboratories in-house for analytical method development, bioanalytical

testing, formulation, stability testing and small-scale compounding of laboratory supplies of product candidates. We utilize
contract manufacturers to produce sufficient quantities of product candidates for use in preclinical and clinical studies and
to store and distribute our product candidates, and we currently do not own or operate manufacturing facilities for our
product candidates. We require manufacturers that produce APIs and finished drug products for clinical use to operate in
accordance with cGMPs and all other applicable laws and regulations. We anticipate that we will rely on contract
manufacturers to develop and manufacture our product candidates for commercial sale. We maintain agreements with
potential and existing manufacturers that include confidentiality and intellectual property provisions to protect our
proprietary rights related to our product candidates. We have not yet entered into a commercial supply agreement for any of
our product candidates, although we intend to do so prior to the applicable product candidate’s commercial launch. Given
the nature of the manufacturing processes of our product candidates, we anticipate that we will be capable of identifying
contract manufacturers to produce these product candidates and of entering into agreements for the commercial supply of
these drugs.

In connection with the OMS103 Agreement, we terminated our agreement with Hospira pursuant to which Hospira

had agreed to manufacture and supply our commercial requirements of liquid OMS103. The OMS103 Agreement obligates
Fagron to meet performance diligence requirements, including to bear all sales and marketing costs for U.S. sales of
OMS103; however, Fagron has not performed its performance diligence obligations under the OMS103 Agreement. For a
description of the OMS103 Agreement and Fagron’s non-performance, see “License and Development Agreements.”

License and Development Agreements

OMS103. In June 2015, we entered into the OMS103 Agreement under which Fagron is obligated to manufacture and

commercialize OMS103. Pursuant to the OMS103 Agreement, we granted Fagron an exclusive, royalty-free license to the
OMS103 intellectual property, manufacturing information and clinical data to produce, on a large-scale registered basis,
and commercialize OMS103 in the United States. If OMS103 is commercialized under the terms of the OMS103
Agreement, we would be eligible to receive payments representing a substantial majority share of gross revenue from
future OMS103 product sales within the United States, which revenue share will not be less than a minimum per unit
amount. Additionally, we would be eligible to receive up to an aggregate total of $10 million in potential payments upon
the achievement of specific commercial milestones and as revenue-share enhancement on early sales. The OMS103
Agreement obligates Fagron to produce under Good Manufacturing Practice, or GMP, and to commercialize OMS103 in
the U.S. Unless terminated earlier, the OMS103 Agreement will continue until expiration of the last-to-expire of the patents
in the licensed intellectual property or as otherwise provided under the terms of the OMS103 Agreement. Either party may
terminate the OMS103 Agreement earlier if the other party materially breaches the OMS103 Agreement and does not cure
the breach within a specified notice period or upon the other party’s insolvency. Additionally, we may terminate the
OMS103 Agreement earlier if Fagron does not meet its performance diligence requirements, in response to a negative
action by a regulatory authority, or if Fagron opposes or challenges any of the licensed patents for OMS103.

Fagron has not performed its performance diligence obligations under the OMS103 Agreement, including initiating

sales, and we are currently evaluating our options regarding the OMS103 Agreement and our OMS103 program.

MASP Program. Under our exclusive license agreements with the University of Leicester and MRC, we have agreed
to pay royalties to each of the University of Leicester and MRC that are a percentage of any proceeds we receive from the
licensed MASP-2 technology during the terms of the agreements. Our exclusive license agreement with the University of
Leicester, but not our agreement with the MRC, also applies to other MASPs. The continued maintenance of these
agreements requires us to undertake development activities. We must pay low single-digit percentage royalties with respect
to proceeds that we receive from products incorporating the licensed technology that are used, manufactured, directly sold
or directly distributed by us, and we must pay royalties, in the range of a low single-digit percentage to a low double-digit
percentage, with respect to proceeds we receive from sublicense royalties or fees that we receive from third parties to
which we grant sublicenses to the licensed technology. We did not make any upfront payments for these exclusive licenses
nor are there any milestone payments or reversion rights associated with these license agreements. We also agreed to
sponsor research of MASP-2 at these institutions at pre-determined rates for maximum terms of approximately three years.
We have agreed to expand the scope of research at the University of Leicester to MASP-3 and have continued the
sponsorship of research at the University of Leicester on a year-by-year basis. If mutually agreed, we may sponsor
additional research related to MASP-2 at MRC, and to MASP-2 and MASP-3 at the University of Leicester. We retain
worldwide exclusive licenses from these institutions to develop and commercialize any intellectual property rights
developed in the sponsored research. The term of each license agreement ends when there are no longer any pending patent
applications, applications in preparation or unexpired issued patents related to any of the intellectual property rights we are
licensing under the agreement. Both of these license agreements may be terminated prior to the end of their terms by us for
convenience or by one party if the other party (1) breaches any material obligation under the agreement and does not cure
such breach after notice and an opportunity to cure or (2) is declared or adjudged to be insolvent, bankrupt or in
receivership and materially limited from performing its obligations under the agreement.

In April 2010, we entered into an exclusive license agreement with Helion Biotech ApS, or Helion, pursuant to which
we received a royalty-bearing, worldwide exclusive license to all of Helion’s intellectual property rights related to MASP-2
antibodies, polypeptides and methods in the field of inhibition of mannan-binding lectin-mediated activation of the
complement system for the prevention, treatment or diagnosis of any disease or condition. We are obligated to make
remaining development and sales milestone payments to Helion of up to $6.1 million upon the achievement of certain
events, such as the filing of an IND with the FDA, initiation of Phase 2 and 3 clinical trials, receipt of marketing approval,
and reaching specified sales milestones. We are obligated to pay Helion a low single-digit percentage royalty on net sales
of a MASP-2 inhibitor product covered by the patents licensed under the agreement. The term of the agreement continues
so long as there is a valid, subsisting and enforceable claim in any patents or patent applications covered by the agreement.
The agreement may be terminated sooner by either party following a material breach of the agreement by the other party
that has not been cured within 90 days.

OMS824. We have agreed to pay royalties to SMRI based on any net income we receive from sales of a PDE10
product until we have paid a maximum aggregate amount that is a low single-digit multiple of the amount of grant funding
that we have received from SMRI. This multiple increases as time elapses from the date we received the grant funding.
There are no minimum payment obligations under our agreement with SMRI. Based on the amount of grant funding that
we received from SMRI, the maximum amount of royalties payable to SMRI is $12.8 million and payment is required only
from any net income, after all related expenses, that we receive from sales of a PDE10 product. The funding agreement and
our obligation to pay a royalty to SMRI terminate when we have repaid such amount in the form of royalties.

We acquired the patent applications and related intellectual property rights for our PP

program in

activity. Under the amended agreement, we have agreed to pay

February 2009 from Roberto Ciccocioppo, Ph.D. of the Università di Camerino, Italy, pursuant to a patent assignment
agreement. In February 2011, we amended the agreement to include all intellectual property rights, including patent
applications, related to nutraceuticals that increase PP
Dr. Ciccocioppo a low-single digit percentage royalty on net sales of any products that are covered by any patents that
issue from the patent applications that we acquired from him. In addition, if we grant any third parties rights to
manufacture, sell or distribute any such products, we must pay to Dr. Ciccocioppo a percentage of any associated fees we
receive from such third parties in the range of low single-digits to low double-digits depending on the stage of development
at which such rights are granted. We have also agreed to make total milestone payments of up to $3.8 million to
Dr. Ciccocioppo upon the occurrence of certain development events, such as patient enrollment in a Phase 1 clinical trial
and receipt of marketing approval of a product candidate covered by any patents that issue from the patent applications that
we acquired from him. If we notify Dr. Ciccocioppo that we have abandoned all research and development and
commercialization efforts related to the patent applications and intellectual property rights we acquired from him,
Dr. Ciccocioppo has the right to repurchase those assets from us at a price equal to a double-digit percentage of our direct
and indirect financial investments and expenditures in such assets. If he does not exercise his right to repurchase those
18

assets within a limited period of time by paying the purchase price, we will have no further obligations to sell those assets
to Dr. Ciccocioppo. The term of our agreement with Dr. Ciccocioppo ends when there are no longer any valid and
enforceable patents related to the intellectual property rights we acquired from him, provided that either party may
terminate the agreement earlier in case of an uncured breach by the other party. Under the terms of the agreement, we have
agreed to pay a portion of the payments due to Dr. Ciccocioppo to the Università di Camerino without any increase to our
payment obligations.

PDE7. Under an agreement with Daiichi Sankyo, we hold an exclusive license to PDE7 inhibitors claimed in certain

patents and pending patent applications owned by Daiichi Sankyo for use in the treatment of (1) movement disorders and
other specified indications, (2) addiction and compulsive disorders and (3) all other diseases except those related to
dermatologic conditions. Under the agreement, we agreed to make milestone payments to Daiichi Sankyo of up to an
aggregate total of $33.5 million upon the achievement of certain events in each of these three fields; however, if only one
of the three indications is advanced through the milestones, the total milestone payments would be $23.5 million. The
milestone payment events include successful completion of preclinical toxicology studies; dosing of human subjects in
Phase 1, 2 and 3 clinical trials; receipt of marketing approval of a PDE7 inhibitor product candidate; and reaching specified
sales milestones. In addition, Daiichi Sankyo is entitled to receive from us a low single-digit percentage royalty of any net
sales of a PDE7 inhibitor licensed under the agreement by us and/or our sublicensee(s) provided that, if the sales are made
by a sublicensee, then the amount payable by us to Daiichi Sankyo is capped at an amount equal to a low double-digit
percentage of all royalty and specified milestone payments received by us from the sublicensee.

The term of the agreement with Daiichi Sankyo continues so long as there is a valid, subsisting and enforceable claim

in any patents covered by the agreement. The agreement may be terminated sooner by us, with or without cause, upon
90 days advance written notice or by either party following a material breach of the agreement by the other party that has
not been cured within 90 days or immediately if the other party is insolvent or bankrupt. Daiichi Sankyo also has the right
to terminate the agreement if we and our sublicensee(s) cease to conduct all research, development and/or
commercialization activities for a PDE7 inhibitor covered by the agreement for a period of six consecutive months, in
which case all rights held by us under Daiichi Sankyo’s patents will revert to Daiichi Sankyo.

OMS616. On December 14, 2010, we entered into a license agreement with The Regents of the University of

California, pursuant to which we received an exclusive license to a series of antifibrinolytic agents claimed in certain
patents owned by The Regents of the University of California in exchange for our agreement to make royalty and
development milestone payments.

GPCR Platform Funding Agreements with Vulcan Inc. and the Life Sciences Discovery Fund. In October 2010, we

entered into funding agreements for our GPCR program with Vulcan and LSDF. We received $20.0 million and $5.0
million, respectively, under the agreements with Vulcan and LSDF. Under these agreements, we have agreed to pay Vulcan
and LSDF tiered percentages of the net proceeds, if any, that we derive from the GPCR program. The percentage rates of
net proceeds payable to Vulcan and LSDF decrease as the cumulative net proceeds reach specified thresholds, and the
blended percentage rate payable to Vulcan and LSDF in the aggregate is in the mid-teens with respect to the first
approximately $1.5 billion of cumulative net proceeds that we receive from our GPCR program. If we receive cumulative
net proceeds in excess of approximately $1.5 billion, the percentage rate payable to Vulcan and LSDF in the aggregate
decreases to one percent. An acquirer of the assets in our GPCR program may be required, and an acquirer of our company
would be required, to assume all of our payment and other obligations under our agreements with Vulcan and LSDF.

Under our agreement with Vulcan, we granted Vulcan a security interest in our personal property related to the GPCR
program, other than intellectual property, which security interest is junior to any existing or future security interests granted
in connection with a financing transaction and which will be released automatically after Vulcan receives $25.0 million
under the agreement. We also agreed not to grant any liens on intellectual property related to the GPCR program without
Vulcan’s consent, subject to specified exceptions. These restrictions could limit our ability to pursue business opportunities
involving the GPCR program or reduce the price for which a potential buyer would pay for the GPCR assets. If we default
under our agreement with Vulcan, in certain circumstances Vulcan may, subject to the rights of any holders of senior
security interests, take control of such pledged assets. If we are liquidated, Vulcan’s right to receive any payments then due
under our agreement would be senior to the rights of the holders of our common stock to receive any proceeds from the
liquidation of our GPCR program assets.

The term of our agreement with Vulcan is 35 years, provided that the term will automatically extend until the

cumulative net proceeds that we receive from the GPCR program are approximately $1.5 billion. The term of our
agreement with LSDF expires on the six-month anniversary following the last date that we deliver a report related to our
incurrence of grant-funded expenses described in the agreement, provided that certain obligations will survive the
expiration of the term. The term of our payment obligations to LSDF is the same as that under our agreement with Vulcan.

Antibody Platform. We hold a worldwide exclusive license to patent rights related to our antibody platform from the

University of Washington, or UW. Pursuant to the Xori APA, we acquired all of Xori’s exclusive rights under a license
agreement with the UW to certain patents and patent applications related to our antibody platform owned by the UW in
exchange for our agreement to make royalty and development milestone payments to UW.

Competition

Overview. The pharmaceutical industry is highly competitive and characterized by a number of established, large
pharmaceutical companies as well as smaller companies like ours. We expect to compete with other pharmaceutical and
biotechnology companies, and our competitors may:

•

develop and market products that are less expensive, more effective or safer than our future products;

commercialize competing products before we can launch our products;

operate larger research and development programs, possess greater manufacturing capabilities or have
substantially greater financial resources than we do;

initiate or withstand substantial price competition more successfully than we can;

have greater success in recruiting skilled technical and scientific workers from the limited pool of available
talent;

• more effectively negotiate third-party licenses and strategic relationships; and

•

take advantage of acquisition or other opportunities more readily than we can.

We expect to compete for market share against large pharmaceutical and biotechnology companies, smaller

companies that are collaborating with larger pharmaceutical companies, new companies, academic institutions, government
agencies and other public and private research organizations. In addition, the pharmaceutical and biotechnology industry is
characterized by rapid technological change. Because our research approach integrates many technologies, it may be
difficult for us to remain current with the rapid changes in each technology. Further, our competitors may render our
technologies obsolete by advancing their existing technological approaches or developing new or different approaches. If
we fail to stay at the forefront of technological change, we may be unable to compete effectively.

OMIDRIA. We are not aware of any products comprised of two or more APIs that directly compete with OMIDRIA,

or our PharmacoSurgery product candidates, that are approved for intraoperative delivery in irrigation solutions during
surgical procedures; however, OMIDRIA and our PharmacoSurgery product candidates could compete with single API
products that are delivered intraoperatively as well as preoperative and postoperative treatments for mydriasis, pain or
inflammation. Our primary competition for OMIDRIA could come from surgeons’ current practices, which may include
use of products obtained from distributors or compounding pharmacies at a relatively low cost. In addition, we anticipate
that there are some surgeons who do not use intraoperative mydriatics and may not agree with the value proposition of
maintaining pupil dilation and inhibiting miosis during the procedure or with the use of a nonsteroidal anti-inflammatory
drug, or NSAID, intraoperatively to reduce inflammation and postoperative pain. Although we are not aware of any
companies developing similar combination approaches for maintenance of intraoperative pupil size and postoperative pain
reduction, such strategies may develop now that OMIDRIA is marketed in the U.S.

As described above, Par filed an ANDA containing a Paragraph IV Certification seeking approval to market a generic

version of OMIDRIA prior to the expiration of the Orange Book Patents. An adverse outcome in our patent infringement
lawsuit filed against Par following receipt of Par’s Notice Letter regarding the Paragraph IV Certification could, among
other things, result in a generic version of OMIDRIA being launched after the expiration of the mandatory three-year
clinical data exclusivity for OMIDRIA, which could have a material negative impact on our financial condition and results
of operations. In the future, other manufacturers may potentially file ANDAs seeking approval for the sale of generic
versions of OMIDRIA before our relevant patents expire, or generic manufacturers may challenge one or more of the
patents using U.S. Patent and Trademark Office procedures. For more information regarding the ANDA filed by Par and
our patent infringement lawsuit against Par, see Part I, Item 3, “Legal Proceedings.”

Product Candidates. Our clinical and preclinical product candidates may face competing products. For example, we

are developing PDE10 inhibitors for use in the treatment of Huntington’s disease, schizophrenia and other diseases that
affect cognition. Other pharmaceutical companies, many with significantly greater resources than we have, are also
developing, or may develop, PDE10 inhibitors for the treatment of Huntington’s disease, schizophrenia and other diseases
that affect cognition, and these companies may be further along in development. In addition, Soliris® is a complement
inhibitor approved for commercial use that will compete with our lead MASP-2 inhibitor OMS721, and/or our MASP-3
inhibitor OMS906, if either is approved for any indication(s) for which Soliris® is also approved. Additionally, The Nordic

Group is currently authorized to market Trasylol® in Europe for patients undergoing coronary artery bypass graft surgery.
In September 2011, the marketing authorization for Trasylol® was also reinstated in Canada, with additional safety
warnings, for patients undergoing coronary artery bypass graft surgery. Any product candidate that we develop in our
Plasmin program for the same indication would directly compete with Trasylol® in any countries in which Trasylol® is
authorized to be marketed. Also, we are aware that other companies are attempting to de-orphanize orphan GPCRs. If any
of these companies is able to de-orphanize an orphan GPCR before we do, we may be unable to establish an exclusive or
commercially valuable intellectual property position around that orphan GPCR.

Intellectual Property

As of March 8, 2016, we owned or held worldwide exclusive licenses to a total of 55 issued patents and 72 pending

patent applications in the U.S. and 310 issued patents and 327 pending patent applications in foreign markets directed to
therapeutic compositions and methods related to our development programs. For each program, our decision to seek patent
protection in specific foreign markets, in addition to the U.S., is based on many factors, including one or more of the
following: our available resources, the size of the commercial market, the presence of a potential competitor or a contract
manufacturer in the market and whether the legal authorities in the market effectively enforce patent rights.

Our patent portfolio for our PharmacoSurgery technology is directed to locally delivered compositions and treatment

methods using agents selected from broad therapeutic classes. These patents and patent applications are directed to
combinations of agents, generic and/or proprietary to us or to others, delivered locally and intraoperatively to the site of
any medical or surgical procedure. As of March 8, 2016, our patent portfolio included nine U.S. and 50 foreign issued or
allowed patents, and 14 U.S. and 72 foreign pending patent applications, directed to our PharmacoSurgery products and
development programs. Our issued PharmacoSurgery patents have terms that will expire as late as October 23, 2033 for
OMIDRIA, September 24, 2022 for OMS103, and July 16, 2029 for OMS201, and, if currently pending patent applications
are issued, as late as November 30, 2035 for OMIDRIA, August 3, 2032 for OMS103, and March 17, 2026 for OMS201.

Our pending PharmacoSurgery patent applications are directed to combinations of agents, drawn from therapeutic

classes such as pain and inflammation inhibitory agents, spasm inhibitory agents, vasoconstrictive agents, mydriatic agents
and agents that reduce intraocular pressure, that are used in ophthalmologic procedures including intraocular procedures
(OMIDRIA), arthroscopic procedures (OMS103), and urologic procedures including ureteroscopy (OMS201) as well as
covering the specific combinations of agents included in each of these products and product candidates.

• OMIDRIA-Ophthalmology. OMIDRIA is encompassed by our PharmacoSurgery patent portfolio. The relevant

patents and patent applications in this portfolio are directed to combinations of agents, generic and/or
proprietary to us or to others, drawn from therapeutic classes such as pain and inflammation inhibitory agents,
mydriatic agents and agents that reduce intraocular pressure, delivered locally and intraoperatively to the site of
ophthalmological procedures, including cataract and lens replacement surgery. As of March 8, 2016, we owned
four issued U.S. patents and four pending U.S. patent applications and 31 issued patents and 55 pending patent
applications in foreign markets that are directed to OMIDRIA.

• OMS103-Arthroscopy. OMS103 is encompassed by our PharmacoSurgery patent portfolio. The relevant patents
and patent applications in this portfolio are directed to combinations of agents, generic and/or proprietary to us
or to others, drawn from therapeutic classes such as pain and inflammation inhibitory agents and
vasoconstrictive agents, delivered locally and intraoperatively to the site of medical or surgical procedures,
including arthroscopy. As of March 8, 2016, we owned three issued U.S. patents, four pending U.S. patent
applications, and 12 issued patents and 16 pending patent applications in foreign markets, that are directed to
OMS103.

• OMS201-Urology. OMS201 is encompassed by our PharmacoSurgery patent portfolio. The relevant patents

and patent applications in this portfolio are directed to combinations of agents, generic and/or proprietary to us
or to others, drawn from therapeutic classes such as pain and inflammation inhibitory agents and spasm
inhibitory agents, delivered locally and intraoperatively to the site of medical or surgical procedures, including
uroendoscopy. As of March 8, 2016, we owned one issued U.S. patent, two pending U.S. patent applications,
and an additional seven issued patents and two pending patent applications in foreign markets, that are directed
to OMS201.

• MASP-2 Program - OMS721. We hold worldwide exclusive licenses to rights in connection with MASP-2, the
antibodies targeting MASP-2 and the therapeutic applications for those antibodies from the University of
Leicester, MRC and Helion. As of March 8, 2016, we exclusively controlled 13 issued patents and 22 pending
patent applications in the U.S., and 61 issued patents and 87 pending patent applications in foreign markets,
related to our MASP-2 program and associated complement targets.

•

PDE10 Program - OMS824. As of March 8, 2016, we owned six issued patents and six pending patent
application in the U.S., and 12 issued patents and 25 pending patent applications in foreign markets, that are
directed to proprietary PDE10 inhibitors.

PP
Program - OMS405. As of March 8, 2016, we owned one issued patent and three pending patent
applications in the U.S., and 15 issued patents and 25 pending patent applications in foreign markets, directed
to our discoveries linking PP

and addictive disorders.

PDE7 Program - OMS527. As of March 8, 2016, we owned two issued patents and two pending patent
applications in the U.S., and 14 issued patents and 17 pending patent applications in foreign markets directed to
our discoveries linking PDE7 to movement disorders, as well as one issued patent and two pending patent
applications in the U.S., and three issued patents and 25 pending patent applications in foreign markets directed
to the link between PDE7 and addiction and compulsive disorders. Additionally, under a license from Daiichi
Sankyo, we exclusively control rights to three issued U.S. patents and 57 issued and five pending patent
applications in foreign markets that are directed to proprietary PDE7 inhibitors. For a more detailed description
of our agreement with Daiichi Sankyo, see “License and Development Agreements.”

Plasmin Program - OMS616. We hold worldwide exclusive licenses to a series of antifibrinolytic agents from
The Regents of the University of California. As of March 8, 2016, we exclusively controlled three issued
patents and two pending patent applications in the U.S. and 22 issued and 12 pending patent applications in
foreign markets that are directed to these proprietary agents.

• MASP-3 Program - OMS906. We own and exclusively control under a license from the University of Leicester
all rights to methods of treating various disorders and diseases by inhibiting MASP-3. As of March 8, 2016, we
exclusively controlled two pending patent applications in the U.S. and 33 pending patent applications in
foreign markets that are directed to these therapeutic methods.

• GPR17. As of March 8, 2016, we owned two pending patent applications in the U.S. directed to compounds

that functionally interact with GPR17 and their therapeutic applications.

• GPCR Platform. As of March 8, 2016, we owned seven issued patents and 13 pending patent applications in

the U.S., and 50 issued patents and seven pending patent applications in foreign markets, which are directed to
previously unknown links between specific molecular targets in the brain and a series of CNS disorders, to our
cellular redistribution assay and to other research tools that are used in our GPCR program, and to orphan
GPCRs and other GPCRs for which we have identified functionally interacting compounds using our cellular
redistribution assay.

•

Antibody Platform. As of March 8, 2016, we owned and/or held worldwide exclusive license rights from the
UW to four issued patents and four pending patent applications in the U.S., and three issued patents and 14
pending patent applications in foreign markets, directed to our antibody platform and antibodies generated
using our platform.

All of our employees enter into our standard employee proprietary information and inventions agreement, which
includes confidentiality provisions and provides us ownership of all inventions and other intellectual property made by our
employees that pertain to our business or that relate to our employees’ work for us or that result from the use of our
resources. Our commercial success will depend in part on obtaining and maintaining patent protection and trade secret
protection of the use, formulation and structure of our products and product candidates and the methods used to
manufacture them, as well as on our ability to defend successfully these patents against third-party challenges. Our ability
to protect our products and product candidates from unauthorized making, using, selling, offering to sell or importing by
third parties is dependent on the extent to which we have rights under valid and enforceable patents that cover these
activities.

The patent positions of pharmaceutical, biotechnology and other life sciences companies can be highly uncertain and

involve complex legal and factual questions for which important legal principles remain unresolved. No consistent policy
regarding the breadth of claims allowed in biotechnology patents has emerged to date in the U.S., and tests used for
determining the patentability of patent claims in all technologies are in flux. The pharmaceutical, biotechnology and other
life sciences patent situation outside the U.S. is even more uncertain. Changes in either the patent laws or in interpretations
of patent laws in the U.S. and other countries may diminish the value of our intellectual property. Accordingly, we cannot
predict the breadth of claims that may be allowed or enforced in the patents that we own or have licensed or in third-party
patents.

We have retained all worldwide manufacturing, marketing and distribution rights for OMIDRIA and each of our
product candidates and programs other than OMS103. Some of our products and product candidates and programs are

based on inventions and other intellectual property rights that we acquired through assignments, exclusive licenses or
acquisitions.

•

PharmacoSurgery Platform. Our scientific co-founders, Gregory A. Demopulos, M.D. and Pamela Pierce
Palmer, M.D., Ph.D., conceived the initial invention underlying our PharmacoSurgery platform and transferred
all of their related intellectual property rights to us in 1994. Other than their rights as shareholders, our
scientific co-founders have not retained any rights to our PharmacoSurgery platform, except that if we file for
liquidation under Chapter 7 of the U.S. Bankruptcy Act or voluntarily liquidate or dissolve, other than in
connection with a merger, reorganization, consolidation or sale of assets, our scientific co-founders have the
right to repurchase the initial PharmacoSurgery intellectual property at the then-current fair market value.
Subsequent developments of the PharmacoSurgery intellectual property were assigned to us by Dr. Demopulos,
Dr. Palmer and other of our employees and consultants, without restriction.

PDE10 and PDE7 Programs. We acquired our PDE10 and PDE7 programs and some of our related patents and
other intellectual property rights as a result of our acquisition of nura, inc. We hold an exclusive license to
certain PDE7 inhibitors claimed in patents and pending patent applications owned by Daiichi Sankyo for use in
the treatment of movement, addiction and compulsive disorders as well as other specified indications. For a
more detailed description of our agreement with Daiichi Sankyo, see “License and Development Agreements.”

• MASP Program. We hold worldwide exclusive licenses to rights related to MASP-2, the antibodies targeting

MASP-2 and the therapeutic applications for the antibodies from the University of Leicester, MRC and Helion.
We jointly own and hold worldwide exclusive license rights related to therapeutic applications for inhibiting
MASP-3 from the University of Leicester. For more detailed descriptions of these licenses, see “License and
Development Agreements.”

•

Program. We acquired the patent applications and related intellectual property rights for our PP
PP
program in 2009 from Roberto Ciccocioppo, Ph.D., of the Università di Camerino, Italy, pursuant to a patent
assignment agreement. For a more detailed description of this agreement, see “License and Development
Agreements.”

Plasmin Program. We hold a worldwide exclusive license to patent rights related to certain antifibrinolytics
from The Regents of the University of California. For a more detailed description of this agreement, see
“License and Development Agreements.”

• GPCR Platform. We acquired our GPCR program and some of our related patents and other intellectual
property rights as a result of our acquisition of nura, inc. In November of 2010 we acquired intellectual
property rights related to an assay technology for our GPCR program from Patobios Limited for approximately
$10.8 million.

•

Antibody Platform. We hold a worldwide exclusive license to patent rights related to our antibody platform
from the UW. For a more detailed description of this agreement, see “License and Development Agreements.

Government Regulation

Government authorities in the U.S., the EU and other countries extensively regulate, among other things, the

research, development, testing, manufacture, labeling, promotion, advertising, distribution, marketing, and export and
import of drug and biologic products such as those we are developing. Failure to comply with applicable requirements,
both before and after approval, may subject us, our third-party manufacturers, and other partners to administrative and
judicial sanctions, such as warning letters, product recalls, product seizures, a delay in approving or refusal to approve
pending applications, civil and other monetary penalties, total or partial suspension of production or distribution,
injunctions, and/or criminal prosecutions.

In the U.S., our products and product candidates are regulated by the FDA as drugs or biologics under the Federal

Food, Drug, and Cosmetic Act, or FDCA, and implementing regulations and, in the case of biologics, also under the Public
Health Service Act. In Europe, our products and product candidates are regulated by the EMA and national medicines
regulators under the rules governing medicinal products in the EU as well as national regulations in individual countries.
OMIDRIA has received marketing approval from the FDA and from the applicable regulatory authorities in the EU. Our
product candidates are in various stages of testing and none of our product candidates, nor OMS103, has received
marketing approval from the FDA or the applicable regulatory authorities in the EU.

The steps required before a product may be approved for marketing by the FDA or the applicable regulatory

authorities typically include the following:

•

formulation development and manufacturing process development;

•

preclinical laboratory and animal testing;

submission to the FDA of an IND for human clinical testing, which must become effective before human
clinical trials may begin; and in Europe, a CTA is filed according to the country’s local regulations;

adequate and well-controlled human clinical trials to establish the efficacy and safety of the product for each
indication for which approval is sought;

adequate assessment of drug product stability to determine shelf life/expiry dating;

in Europe, submission to the EMA or national regulatory authority of a marketing authorization application, or
MAA, and in the U.S., submission to the FDA of a New Drug Application, or NDA, in the case of a drug
product, or a BLA in the case of a biologic product;

satisfactory completion of inspections of clinical sites at which clinical trials with the product were carried out
and of the manufacturing facility or facilities at which the product is produced to assess compliance with
current Good Clinical Practices, or cGCP, and cGMP; and

FDA review and approval of an NDA or BLA, or review and approval of an MAA by the applicable regulatory
authorities in the EU.

Manufacturing. Manufacturing of drug products for use in clinical trials must be conducted according to relevant

national guidelines, for example, cGMP. Process and formulation development are undertaken to design suitable routes to
manufacture the drug substance and the drug product for administration to animals or humans. Analytical development is
undertaken to obtain methods to quantify the potency, purity and stability of the drug substance and drug product as well as
to measure the amount of the drug substance and its metabolites in biological fluids, such as the blood.

Preclinical Tests. Preclinical tests include laboratory evaluations and animal studies to assess efficacy, toxicity and

pharmacokinetics. The results of the preclinical tests, together with manufacturing information, analytical data, clinical
development plan, and other available information are submitted as part of an IND or CTA.

The IND/CTA Process. An IND or CTA must become effective before human clinical trials may begin. An IND will

automatically become effective 30 days after receipt by the FDA unless, before that time, the FDA raises concerns or
questions and imposes a clinical hold. In that event, the IND sponsor and the FDA must resolve any outstanding FDA
concerns or questions before the clinical hold is lifted and clinical trials can proceed. Similarly, a CTA must be cleared by
the local independent ethics committee and competent authority prior to conducting a clinical trial in the European country
in which it was submitted. This process can take from two weeks to several months. There can be no assurance that
submission of an IND or CTA will result in authorization to commence clinical trials. Once an IND or CTA is in effect,
there are certain reporting requirements.

Clinical Trials. Clinical trials involve the administration of the investigational product to human subjects under the

supervision of qualified personnel and must be conducted in accordance with local regulations and cGCP. Clinical trials are
conducted under protocols detailing, for example, the parameters to be used in monitoring patient safety and the efficacy
criteria, or endpoints, to be evaluated. Each trial must be reviewed and approved by an independent Institutional Review
Board or Ethics Committee for each clinical site at which the trial will be conducted before it can begin. Clinical trials are
typically conducted in three defined phases, but the phases may overlap or be combined:

•

Phase 1 usually involves the initial administration of the investigational product to human subjects, who may or
may not have the disease or condition for which the product is being developed, to evaluate the safety, dosage
tolerance, pharmacodynamics and, if possible, to gain an early indication of the effectiveness of the product.

Phase 2 usually involves trials in a limited patient population with the disease or condition for which the
product is being developed to evaluate appropriate dosage, to identify possible adverse side effects and safety
risks, and to evaluate preliminarily the effectiveness of the product for specific indications.

Phase 3 clinical trials usually further evaluate and confirm effectiveness and test further for safety by
administering the product in its final form in an expanded patient population.

We, our product development partners, Institutional Review Boards or Ethics Committees, the FDA or other
regulatory authorities may suspend clinical trials at any time on various grounds, including a belief that the subjects are
being exposed to an unacceptable health risk.

The Application Process. If the necessary clinical trials are successfully completed, the results of the preclinical trials
and the clinical trials, together with other detailed information, including information on the manufacture and composition
of the product, are submitted to the FDA in the form of an NDA or a BLA, as applicable, and to the EMA or national
regulators in the form of an MAA, requesting approval to market the product for a specified indication. In the EU, an MAA

may be submitted to the EMA for review and, if the EMA gives a positive opinion, the European Commission may grant a
marketing authorization that is valid across the EU (centralized procedure). Alternatively, an MAA may be submitted to
one or more national regulators in the EU according to one of several national or decentralized procedures. The type of
submission in Europe depends on various factors and must be cleared by the appropriate authority prior to submission. For
most of our product candidates, the centralized procedure will be either mandatory or available as an option.

If the regulatory authority determines that the application is not acceptable, they may refuse to accept the application

for filing and review, outlining the deficiencies in the application and specifying additional information needed to file the
application. Notwithstanding the submission of any requested additional testing or information, the regulatory authority
ultimately may decide that the application does not satisfy the criteria for approval. Before approving an NDA or BLA, or
an MAA, the FDA or the EMA, respectively, may inspect the clinical sites at which the Phase 3 study(ies) were conducted
to assure that GCPs were followed and may inspect facility(ies) at which the product is manufactured to assure satisfactory
compliance with cGMP. After approval, changes to the approved product such as adding new indications, manufacturing
changes, or additional labeling claims will require submission of a supplemental application or, in some instances, a new
application, for further review and approval. The testing and approval process requires substantial time, effort, and
financial resources, and we cannot be sure that any future approval will be granted on a timely basis, if at all.

Some of our drug products may be eligible for submission to the FDA of NDAs for approval under the Section 505
(b)(2) process. Section 505(b)(2) applications may be submitted for drug products that represent a modification, such as a
new indication or new dosage form, of a previously approved drug. Section 505(b)(2) applications may rely on the FDA’s
previous findings for the safety and effectiveness of the previously approved drug in addition to information obtained by
the 505(b)(2) applicant to support the modification of the previously approved drug. Preparing Section 505(b)(2)
applications may be less costly and time-consuming than preparing an NDA based entirely on new data and information.

The FDA regulates certain of our products and product candidates, such as OMIDRIA and OMS103, as fixed-dose

combination drugs under its Combination Drug Policy (21 CFR Section 300.50) because they are comprised of two or
more active ingredients. In addition to demonstrating that the drug product is safe and effective, the FDA’s Combination
Drug Policy requires that we demonstrate that each active ingredient in a drug product contributes to the product’s
effectiveness. The EMA has a similar Guideline for fixed-dose combination products. Satisfaction of the U.S. or EU
requirements for fixed-dose combination products may involve substantial time, effort, and financial resources, and we
cannot be sure that work conducted to satisfy these requirements will be deemed acceptable by the applicable regulatory
authority.

Some of our product candidates, such as those from our MASP-2, MASP-3 and Plasmin programs, are considered

biologics because they are derived from natural sources as opposed to being chemically synthesized. The added complexity
associated with manufacturing biologics may result in additional monitoring of the manufacturing process and product
changes.

In addition, we, our suppliers, and our contract manufacturers are required to comply with extensive FDA and EMA
requirements both before and after approval. For example, we must establish a pharmacovigilance system and are required
to report adverse reactions and production problems, if any, to the regulatory authorities. We must also comply with certain
requirements concerning advertising and promotion for our products. The regulatory authorities may impose specific
obligations as a condition of the marketing authorization, such as additional safety monitoring, or the conduct of additional
clinical trials or post-marketing safety studies. Also, quality control and manufacturing procedures must continue to
conform to cGMPs after approval. Accordingly, manufacturers must continue to expend time, money, and effort in all areas
of regulatory compliance, including production and quality control to comply with cGMPs. In addition, discovery of
problems such as safety issues may result in changes in labeling or restrictions on a product manufacturer or marketing
authorization holder, including removal of the product from the market.

Programs for Expedited Review. Section 506(b) of the FDCA provides for the designation of a drug as a fast track
product if it is intended, whether alone or in combination with one or more other drugs, for the treatment of a serious or
life-threatening disease or condition, and it demonstrates the potential to address unmet medical needs for such a disease or
condition. A program with Fast Track status is afforded greater access to the FDA for the purpose of expediting the
product’s development, review and potential approval. Many products that receive Fast Track designation are also
considered appropriate to receive Priority Review, and their respective applications may be accepted by the FDA as a
rolling submission in which portions of an NDA are reviewed before the complete application is submitted. Together, these
may reduce time of development and FDA review time. In Europe, products that are considered to be of major public
health interest are eligible for accelerated assessment, which shortens the review period substantially. The grant of Fast
Track status, Priority Review or accelerated assessment does not alter the standard regulatory requirements for obtaining
marketing approval, however.

Orphan Drug Designation. Under the Orphan Drug Act, or ODA, the FDA may grant orphan drug designation to
drugs or biologics intended to treat a rare disease or condition that affects fewer than 200,000 individuals in the U.S. or
more than 200,000 individuals in the U.S. for which the cost of developing and making the product available in the U.S. for
this type of disease or condition is not likely to be recovered from U.S. sales for that product. The granting of orphan
designation does not alter the standard regulatory requirements and process for obtaining marketing approval. If a product
that has an orphan drug designation subsequently receives the first FDA approval for the indication for which it has such
designation, the sponsor of the product qualifies for various development incentives specified in the ODA, including tax
credits for qualified clinical testing. Furthermore, the product is entitled to an orphan drug exclusivity period, which means
the FDA may not grant approval to any other application to market the same drug for the same indication for a period of
seven years except in limited circumstances. The EU has a similar Orphan Drug program to that of the U.S., and it is
administered through the EMA’s Committee for Orphan Medicinal Products, or COMP.

Pediatric Testing and Exclusivity. In the United States, NDAs and BLAs are subject to both mandatory pediatric

testing requirements and voluntary pediatric testing incentives in the form of pediatric exclusivity. An additional six
months of exclusivity in the U.S. may be granted to a sponsor of an NDA or BLA if the sponsor conducts certain pediatric
studies. This process is initiated by the FDA as a written request for pediatric studies to determine if the drug or biologic
could have meaningful pediatric health benefits. If the FDA determines that the sponsor has conducted the requested
pediatric studies in accordance with the written request, then an additional six months of pediatric exclusivity may attach in
the case of a drug to any other regulatory exclusivity or patent protection applicable to the drug, and in the case of a
biologic to any other regulatory exclusivity applicable to the biologic. The EU has a similar requirement and incentive for
the conduct of pediatric studies according to the pediatric investigation plan, which must be adopted by the EMA before an
MAA may be submitted.

Labeling, Marketing, and Promotion. The FDA closely regulates the labeling, marketing and promotion of drugs.

Failure to comply with these requirements can result in adverse publicity, warning letters, corrective advertising,
injunctions and potential civil and criminal penalties.

In addition, in the U.S. the research, manufacturing, distribution, sale and promotion of drug products are potentially
subject to regulation by various federal, state and local authorities in addition to the FDA, including CMS, other divisions
of the U.S. Department of Health and Human Services (e.g., the Office of Inspector General), the U.S. Department of
Justice, state Attorneys General, and other state and local government agencies. All of these activities are also potentially
subject to federal and state consumer protection and unfair competition laws. Violations of these laws are punishable by
prison sentences, criminal fines, administrative civil money penalties, and exclusion from participation in federal
healthcare programs.

There are also an increasing number of state laws that require manufacturers to make reports to states on pricing and

marketing information or impose other special requirements for the sale and marketing of drug products. Many of these
laws contain ambiguities as to what is required to comply with the laws. In addition, federal and state “transparency laws”
require manufacturers to track and report certain payments made to healthcare providers. These laws may affect our sales,
marketing and other promotional activities by imposing administrative and compliance burdens on us. In addition, our
reporting actions could be subject to the penalty provisions of the pertinent state and federal authorities.

Compounding Pharmacies and Registered Outsourcing Facilities. Title I (the Compounding Quality Act) of the

DQSA, which was enacted in November 2013, amends the FDCA to establish a distinct category of drug compounders
known as “outsourcing facilities.” A compounding pharmacy that elects to register with the FDA as an outsourcing facility
is exempt from certain FDCA requirements, including the obligation to obtain FDA approval of an NDA, if the facility
satisfies conditions set out in the statute. The DQSA also imposes restrictions on the materials that may be compounded at
registered outsourcing facilities. Like “traditional” pharmacy compounders, such as those found in hospitals, outsourcing
facilities may not compound drugs that are “essentially a copy of one or more approved drugs” or that present
“demonstrable difficulties for compounding.” The statute also imposes conditions on the compounding of bulk substances.
The FDA has identified compounding as an enforcement priority in 2016, but it remains to be seen how the agency will
interpret key provisions of the DQSA, such as the prohibition on compounding drugs that are “essentially a copy of one or
more approved drugs,” and to what extent the DQSA gives the agency sufficient authority to regulate compounding
activities in violation of the FDCA.

Drug Supply Chain Security Act. Title II (the Drug Supply Chain Security Act), or DSCSA, of the DQSA imposes on

manufacturers of certain pharmaceutical products new obligations related to product tracking and tracing, among others,
which will be phased in over several years beginning in 2015. Among the requirements of this legislation, manufacturers
subject to the DSCSA will be required to provide certain information regarding the drug product to individuals and entities
to which product ownership is transferred, label drug product with a product identifier and keep certain records regarding

the drug product. The transfer of information to subsequent product owners by manufacturers will eventually be required to
be done electronically. Covered manufacturers will also be required to verify that purchasers of the manufacturers’ products
are appropriately licensed. Further, under the DSCSA, covered manufacturers will have drug product investigation,
quarantine, disposition, and notification responsibilities related to counterfeit, diverted, stolen, and intentionally adulterated
products, as well as products that are the subject of fraudulent transactions or which are otherwise unfit for distribution
such that they would be reasonably likely to result in serious health consequences or death.

Foreign Regulatory Requirements. Outside of the U.S., our ability to conduct clinical trials or market our products

will also depend on receiving the requisite authorizations from the appropriate regulatory authorities. The foreign
regulatory approval processes include similar requirements and many of the risks associated with the FDA and/or the EMA
approval process described above, although the precise requirements may vary from country to country.

Hatch-Waxman Act. In seeking approval for a drug through an NDA, applicants are required to list with the FDA
each patent with claims that cover the applicant’s drug or an approved method of use of the drug. Upon approval of a drug,
each of the patents listed in the application for the drug is then published in the FDA’s Approved Drug Products with
Therapeutic Equivalence Evaluations, commonly known as the Orange Book. Drugs listed in the Orange Book can, in turn,
be cited by potential competitors in support of approval of an ANDA or a 505(b)(2) application. An ANDA provides for
marketing of a drug that has the same active ingredients in the same strengths and dosage form as the listed drug and has
been shown through testing to be bioequivalent to the listed drug. ANDA applicants are generally not required to conduct
or submit results of pre-clinical or clinical tests to prove the safety or effectiveness of their drug, other than the requirement
for bioequivalence testing. Drugs approved in this way based on a showing of sameness and bioequivalence to the listed
drug are considered therapeutically equivalent, and are commonly referred to as “generic equivalents” to the listed drug.
These drugs then generally can be substituted by pharmacists under prescriptions written for the original listed drug.

The ANDA or 505(b)(2) applicant is required to certify to the FDA concerning any patents listed for the referenced
approved drug in the FDA’s Orange Book. Specifically, the applicant must certify that: (i) the required patent information
has not been filed; (ii) the listed patent has expired; (iii) the listed patent has not expired, but will expire on a particular date
and approval is sought after patent expiration; or (iv) the listed patent is invalid or unenforceable, or will not be infringed
by the new drug. A certification that the new drug will not infringe the already approved drug’s listed patents or that such
patents are invalid or unenforceable is called a Paragraph IV Notice Letter. If the applicant does not challenge the listed
patents, the ANDA or 505(b)(2) application will not be approved until all of the listed patents claiming the referenced drug
have expired.

If the ANDA or 505(b)(2) applicant has provided a Paragraph IV Notice Letter to the FDA, the applicant must also
send notice of the Paragraph IV Notice Letter to the NDA and patent holders once the ANDA or 505(b)(2) application has
been accepted for filing by the FDA. The NDA and patent holders may then initiate a patent infringement lawsuit in
response to the notice of the Paragraph IV Notice Letter. The filing of a patent infringement lawsuit within 45 days of the
receipt of notice of a Paragraph IV Notice Letter automatically prevents the FDA from approving the ANDA until the
earlier of 30 months, expiration of the patent, settlement of the lawsuit, modification by a court or a decision in the
infringement case that is favorable to the ANDA or 505(b)(2) applicant.

The ANDA or 505(b)(2) application also will not be approved until any applicable non-patent exclusivity, such as

exclusivity for obtaining approval of a new chemical entity, listed in the Orange Book for the referenced drug has expired.
The U.S. Drug Price Competition and Patent Term Restoration Act of 1984, more commonly known as the “Hatch-
Waxman Act,” provides a period of five years following approval of a drug containing no previously approved active
moiety, during which ANDAs for generic versions of those drugs and 505(b)(2) applications referencing those drugs
cannot be submitted unless the submission contains a Paragraph IV challenge to a listed patent, in which case the
submission may be made four years following the original drug approval. Federal law provides for a period of three years
of exclusivity following approval of a listed drug that contains previously approved active ingredients but is approved in a
new dosage form, route of administration or combination, or for a new use, the approval of which was required to be
supported by new clinical trials, other than bioavailability studies, conducted by or for the sponsor, during which FDA
cannot grant effective approval of an ANDA or 505(b)(2) application based on that listed drug.

As described above, Par has sent a Paragraph IV Notice Letter stating that it has filed an ANDA containing a
Paragraph IV Certification under the Hatch-Waxman Act seeking approval from the FDA to market a generic version of
OMIDRIA prior to the expiration of the Orange Book Patents. Following receipt of Par’s Notice Letter regarding the
Paragraph IV Certification, in September 2015, we filed a patent infringement lawsuit in the U.S. District Court for the
District of Delaware against Par. For more information regarding the ANDA filed by Par and our patent infringement
lawsuit against Par, see Part I, Item 3, “Legal Proceedings.”

Healthcare compliance laws. In the U.S., commercialization of Omidria and our product candidates, if approved, is

subject to regulation and enforcement under a number of federal and state healthcare compliance laws administered and
enforced by agencies other than the FDA. These include the following:

•

the federal Anti-Kickback Law, which prohibits offering or paying anything of value to a person or entity to
induce the use of a good or service covered by a federal health care program such as Medicare or Medicaid;

the federal False Claims Act, which prohibits presenting or causing to be presented a false claim for payment
by a federal health care program, and which has been interpreted to include claims caused by improper drug-
manufacturer product promotion or the payment of kickbacks;

a variety of governmental pricing, price reporting, and rebate requirements, including those under Medicaid
and the Veterans Health Care Act; and

the so-called Sunshine Act and related provisions of the Affordable Care Act, which require that we report to
the federal government information on financial payments that we make to physicians and certain healthcare
institutions and also on drug samples that we distribute.

In addition to these federal law requirements, there are related state law requirements. Also, if we receive protected

patient health information, we may be subject to federal or state privacy laws.

Similar requirements apply to our ex-U.S. operations. U.S. laws such as the Foreign Corrupt Practices Act prohibit

the offering or payment of bribes or inducements to foreign public officials, including potentially physicians or other
medical professionals who are employees of public health care entities. In addition, many countries have their own laws
similar to the healthcare compliance laws that exist in the U.S.

Pharmaceutical Pricing and Reimbursement

Overview. In both U.S. and foreign markets, our ability to commercialize our products and product candidates
successfully, and to attract commercialization partners for our products and product candidates, depends in significant part
on the availability of adequate financial coverage and reimbursement from third-party or private payers including, in the
U.S., managed care organizations and private health insurers as well as governmental payers such as the Medicare and
Medicaid programs. Reimbursement by a third-party payer may depend on a number of factors, including the payer’s
determination that use of a product is

•

a covered benefit under its health plan;

safe, effective and medically necessary;

appropriate for the specific patient;

cost-effective; and

neither experimental nor investigational.

Reimbursement by government payers may depend on the same or similar factors as reimbursement by private third-party
payers and also depends on complex regulations that may change with annual or more frequent rulemaking and other
legislative activities.

Third-party private and governmental payers are increasingly challenging the prices charged for medicines and

examining their cost effectiveness in addition to their safety and efficacy. We may need to conduct expensive
pharmacoeconomic studies in order to demonstrate the cost effectiveness of our products or product candidates. Even with
the availability of such studies, third-party private and/or governmental payers may not provide coverage and
reimbursement for our products or product candidates, in whole or in part.

United States. Political, economic and regulatory influences are subjecting the healthcare industry in the U.S. to
fundamental changes. There have been, and we expect there will continue to be, legislative and regulatory proposals to
change the healthcare system in ways that could significantly affect our business. We anticipate that the U.S. Congress,
state legislatures and the private sector will continue to consider and may adopt healthcare policies intended to curb rising
healthcare costs. We are unable to predict what additional legislation, regulations or policies, if any, relating to the
healthcare industry or coverage and reimbursement may be enacted in the future or what effect such legislation, regulations
or policies would have on our business. Any cost-containment measures, including those listed above, or other healthcare
system reforms that are adopted could have a material adverse effect on our business prospects.

In October 2014 we were granted transitional pass-through reimbursement status by CMS for OMIDRIA, which

became effective January 1, 2015. Pass-through status allows for separate payment for OMIDRIA under Medicare Part B

as opposed to having OMIDRIA be included as part of the existing packaged payment for cataract surgery when performed
in hospital outpatient departments and ASCs. We expect pass-through status to remain in effect until January 1, 2018.
When the pass-through status was granted, CMS set the Medicare reimbursement rate for OMIDRIA under Medicare Part
B at the product’s wholesale acquisition cost, or WAC, of $465 plus six percent (6%) per single-use vial for the second and
third quarters of 2015 after which the rate is based on ASP plus six percent (6%). If, following the termination of pass-
through status for OMIDRIA on December 31, 2017, the drug is packaged into the surgical facility payment, we may need
to adjust our pricing accordingly and our revenue could be lower than if separate payment had continued. In addition,
reimbursement from private payers may, or may not, reference our CMS reimbursement status in their coverage and
payment decisions. Other payers often follow, but are not required to follow, the reimbursement methodology adopted by
CMS.

Europe. Governments in the various member states of the EU influence or control the price of medicinal products in

their countries through their pricing and reimbursement rules and control of national healthcare systems that fund a large
part of the cost of those products to consumers. To obtain reimbursement or pricing approval, some of these countries may
require the completion of clinical trials or pharmacoeconomic studies that assess the cost-effectiveness of a product
candidate relative to currently available therapies or relative to a specified standard. The downward pressure on healthcare
costs in general, particularly prescription medicines, has become very intense. As a result, increasingly high barriers are
being erected to the entry of new products.

Research and Development

We have built a research and development organization that includes expertise in discovery research, preclinical
development, product formulation, analytical and medicinal chemistry, manufacturing, clinical development and regulatory
and quality assurance. We operate cross-functionally and are led by an experienced research and development management
team. We use rigorous project management techniques to assist us in making disciplined strategic research and
development programmatic decisions and to limit the risk profile of our product pipeline. We also access relevant market
information and key opinion leaders in creating target product profiles and, when appropriate, as we advance our programs
to commercialization. We engage third parties on a limited basis to conduct portions of our preclinical research; however,
we are not substantially dependent on any third parties for our preclinical research nor do any of these third parties conduct
a major portion of our preclinical research. In addition, we engage multiple clinical sites to conduct our clinical trials;
however, we are not substantially dependent upon any one of these sites for our clinical trials nor do any of them conduct a
major portion of our clinical trials. Research and development expenses were $48.4 million, $47.9 million and $36.3
million in 2015, 2014 and 2013, respectively.

Employees

As of February 29, 2016, we had 162 full-time employees, 82 of whom are in research and development, 52 of whom

are in sales and marketing and 28 of whom are in finance, legal, business development and administration. Our full-time
employees include six with M.D.s and 25 with Ph.D.s., of whom five and 25, respectively, are in research and
development. None of our employees is represented by a labor union, and we consider our employee relations to be good.

Executive Officers and Significant Employees

The following table provides information regarding our executive officers and significant employees as of March 15,

2016:

Name
Executive Officers:

Gregory A. Demopulos, M.D.

Michael A. Jacobsen

Marcia S. Kelbon, J.D., M.S.
Significant Employees:
Christopher S. Bral, Ph.D.

Timothy M. Duffy

Kenneth M. Ferguson, Ph.D.
George A. Gaitanaris, M.D., Ph.D.

William J. Lambert, Ph.D.

Catherine A. Melfi, Ph.D.

Patricia Sandler

J. Steven Whitaker, M.D., J.D.

Age

Position(s)

50
55

60
59

President, Chief Executive Officer and Chairman of
the Board of Directors
Vice President, Finance, Chief Accounting Officer
and Treasurer
Vice President, Patent, General Counsel and
Secretary

Vice President, Nonclinical Development
Vice President, Business Development
Vice President, Development and Chief
Development Officer
Vice President, Science and Chief Scientific Officer
Vice President, Chemistry, Manufacturing and
Controls

Vice President, Regulatory Affairs and Quality
Systems

Vice President, Sales and Marketing

Vice President, Clinical Development and Chief
Medical Officer

Gregory A. Demopulos, M.D. founded our company and has served as our president, chief executive officer and
chairman of the board of directors since June 1994. In an interim capacity, he also served as our chief financial officer and
treasurer from January 2009 to October 2013 and as our chief medical officer from June 1994 to March 2010. Prior to
founding Omeros, Dr. Demopulos completed his residency in orthopedic surgery at Stanford University and his fellowship
training in hand and microvascular surgery at Duke University. Dr. Demopulos currently serves on the board of trustees of
the Smead Funds Trust, an open-end mutual fund company registered under the Investment Company Act of 1940, and on
the board of directors of Onconome, Inc., a privately held company developing biomarkers for early cancer detection. His
non-profit service includes the Seattle Community Development Round Table and the Northwest NeuroNeighborhood
board of directors. Dr. Demopulos received his M.D. from the Stanford University School of Medicine and his B.S. from
Stanford University. Dr. Demopulos is the brother of Peter A. Demopulos, M.D., a member of our board of directors.

Michael A. Jacobsen joined Omeros in September 2013 and has served as our vice president, finance, chief
accounting officer and treasurer since October 2013. Prior to joining Omeros, Mr. Jacobsen served as vice president of
finance of Sarepta Therapeutics, Inc. from September 2011 to May 2013 and as its chief accounting officer from September
2011 to December 2012. From April 2007 to August 2011, Mr. Jacobsen was vice president and chief accounting officer at
ZymoGenetics, Inc. Prior to his service with ZymoGenetics, Mr. Jacobsen held various roles at ICOS Corporation,
including senior director of finance and corporate controller. From April 1995 to October 2001, Mr. Jacobsen held vice
president of finance or chief financial officer roles at three companies in the software, computer hardware and internet
retailing industries, two of which were publicly traded. Mr. Jacobsen is a certified public accountant and received his
bachelor’s degree in accounting from Idaho State University.

Marcia S. Kelbon, J.D., M.S. has served as our vice president, patent and general counsel since October 2001 and as

our secretary since September 2007. Prior to joining Omeros, Ms. Kelbon was a partner with the firm of Christensen
O’Connor Johnson & Kindness, PLLC, where she specialized in U.S. and international intellectual property procurement,
management, licensing and enforcement issues. Ms. Kelbon received her J.D. and her M.S. in chemical engineering from
the University of Washington and her B.S. from The Pennsylvania State University.

Christopher S. Bral, Ph.D. joined Omeros as our vice president, nonclinical development in October 2015. From
April 2014 to October 2015, Dr. Bral was the executive director, toxicology at Arrowhead Research Corporation. From
June 2008 to April 2014, Dr. Bral served as director, drug safety evaluation at Vertex Pharmaceuticals. Prior to Vertex, Dr.
Bral held various pre-clinical drug safety positions of increasing responsibility at Schering-Plough Research Institute
including associate director, drug safety evaluation. Dr. Bral received his Ph.D. in biochemistry and biophysics from Texas
A&M University and his B.S. in chemistry from John Carroll University, and has been board-certified in toxicology
through the American Board of Toxicology since 2000.

Timothy M. Duffy has served as our vice president, business development since March 2010. From November 2008
to March 2010, Mr. Duffy served as the managing director of Pacific Crest Ventures, a life science consulting firm that he
founded. From June 2004 through September 2008, Mr. Duffy served at MDRNA, Inc. (formerly Nastech Pharmaceutical
Company, Inc.), a biotechnology company. At MDRNA, he held roles of increasing responsibility in marketing and
business development, most recently as the chief business officer. Prior to MDRNA, Mr. Duffy served as vice president,
business development at Prometheus Laboratories, Inc., a specialty pharmaceutical company, and as a customer marketing
manager at The Procter & Gamble Company. Mr. Duffy received his B.S. from Loras College.

Kenneth M. Ferguson, Ph.D. has served as our vice president, development since November 2010 and as our chief

development officer since October 2012. From August 2008 to November 2010, Dr. Ferguson served in various positions,
including president, chief executive officer and executive director as well as a consultant, for VacTX International Inc., a
biotechnology company. From 1990 to 2007, Dr. Ferguson served at ICOS Corporation. Prior to its acquisition in 2007 by
Eli Lilly and Company, Dr. Ferguson served at ICOS as vice president, therapeutic development. He also served as chief
operating officer, chief scientific officer and a member of the board of managers of Lilly ICOS LLC, the joint venture of
Eli Lilly and ICOS that developed and marketed Cialis®. Following the acquisition of ICOS by Eli Lilly, he served as
president of ICOS from January 2007 to December 2007, managing its integration into Eli Lilly. Before joining ICOS,
Dr. Ferguson worked for Cold Spring Harbor Laboratory. He holds a Ph.D. in pharmacology from the University of Texas
Health Science Center and a B.S. in biological sciences from Cornell University.

George A. Gaitanaris, M.D., Ph.D. has served as our vice president, science since August 2006 and as our chief
scientific officer since January 2012. From August 2003 to our acquisition of nura, inc. in August 2006, Dr. Gaitanaris
served as the chief scientific officer of nura, a company that he co-founded and that developed treatments for central
nervous system disorders. From 2000 to 2003, Dr. Gaitanaris served as president and chief scientific officer of Primal, Inc.,
a biotechnology company that was acquired by nura in 2003. Prior to co-founding Primal, Dr. Gaitanaris served as staff
scientist at the National Cancer Institute. Dr. Gaitanaris received his Ph.D. in cellular, molecular and biophysical studies
and his M.Ph. and M.A. from Columbia University and his M.D. from the Aristotelian University of Greece.

William J. Lambert, Ph.D. joined Omeros as our vice president, chemistry, manufacturing and controls in January

2015. From October 2011 to January 2015, Dr. Lambert headed the Innovative Drug Delivery Group of MedImmune, the
global biologics research and development arm of AstraZeneca. From January 2006 to September 2011, Dr. Lambert
served as senior vice president of pharmaceutical development at Pacira Pharmaceuticals. Prior to Pacira, Dr. Lambert
directed drug delivery, product development and cGMP clinical supply groups at Eisai Inc. He has also held various
pharmaceutical research positions at Pfizer Inc. and the Upjohn Company. Dr. Lambert received his Ph.D. in
Pharmaceutics from the University of Utah and his B.S. in Pharmacy from the University of Rhode Island.

Catherine A. Melfi, Ph.D. has served as our vice president, regulatory affairs and quality systems since October 2012.

Dr. Melfi previously served from January 1996 to October 2012 at Eli Lilly and Company, where she held technical and
leadership roles of increasing scope and responsibility, including as senior director and scientific director in Global Health
Outcomes and Regulatory Affairs, respectively. Prior to joining Eli Lilly, Dr. Melfi held various faculty and research
positions at Indiana University, including appointments in its Economics Department, in the School of Public and
Environmental Affairs, and in the Indiana University School of Medicine. Dr. Melfi received her Ph.D. in Economics from
the University of North Carolina - Chapel Hill and B.S. in Economics from John Carroll University.

Patricia Sandler joined Omeros in May 2014 as our national sales director and has served as our vice president, sales

and marketing since November 2014. From October 2007 through September 2013, Ms. Sandler served in sales and
marketing roles at Sunovion Pharmaceuticals, Inc., including leading a national allergy/asthma sales team from December
2010 to September 2013, managing the Lunesta brand as executive director for central nervous system product marketing
from June 2009 to December 2010 and serving as director of respiratory marketing from October 2007 to June 2009. From
July 1998 to October 2007, Ms. Sandler served in marketing and sales roles at Johnson & Johnson including as product
director of gastroenterology marketing. Prior to Johnson & Johnson, she held various sales positions at large
pharmaceutical companies including SmithKline Beecham Pharmaceuticals and Pfizer Inc. Ms. Sandler received her B.S.
in business administration from Bloomsburg University of Pennsylvania.

J. Steven Whitaker, M.D., J.D. has served as our vice president, clinical development and chief medical officer since

March 2010. From May 2008 to March 2010, Dr. Whitaker served as the chief medical officer, vice president of clinical
development at Allon Therapeutics, Inc., a biotechnology company focused on developing drugs for neurodegenerative
diseases. From August 2007 to May 2008, he served as a medical consultant to Accelerator Corporation, a biotechnology-
company investor and incubator. From May 1994 to May 2007, Dr. Whitaker served at ICOS Corporation, which was
acquired by Eli Lilly and Company in 2007. At ICOS, he held roles of increasing responsibility in clinical research and
medical affairs, most recently as divisional vice president, clinical research as well as medical director of the Cialis® global

product team. Dr. Whitaker received his M.D. from the Indiana University School of Medicine, his J.D. from the
University of Washington and his B.S. from Butler University.

Corporate Information

We were incorporated in 1994 as a Washington corporation. Our principal executive offices are located at 201 Elliott

Avenue West, Seattle, Washington, 98119, and our telephone number is (206) 676-5000. Our website address is
www.omeros.com. We make available, free of charge through our investor relations website at investor.omeros.com, our
annual report on Form 10-K, our quarterly reports on Form 10-Q, our 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, including exhibits to those reports,
as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. Our websites and
the information contained therein or incorporated therein are not intended to be incorporated into this Annual Report on
Form 10-K. In addition, the public may read and copy any materials we file or furnish with the SEC at the SEC’s Public
Reference Room at 100 F Street, N.E., Washington, D.C. 20549 or may obtain information on the operation of the Public
Reference Room by calling the SEC at 1-800-SEC-0330. Moreover, the SEC maintains a website that contains reports,
proxy and information statements, and other information regarding reports that we file or furnish electronically with them
at www.sec.gov.

ITEM 1A. RISK FACTORS

The risks and uncertainties described below may have a material adverse effect on our business, prospects, financial
condition or operating results. In addition, we may be adversely affected by risks that we currently deem immaterial or by other
risks that are not currently known to us. You should carefully consider these risks before making an investment decision. The
trading price of our common stock could decline due to any of these risks and you may lose all or part of your investment. In
assessing the risks described below, you should also refer to the other information contained in this Annual Report on Form 10-
K.

Risks Related to Our Products, Programs and Operations

Our ability to achieve profitability is dependent on the commercial success of OMIDRIA, for which the broad U.S.
launch occurred in April 2015. To the extent OMIDRIA is not successful, our business, financial condition and results of
operations may be materially adversely affected and the price of our common stock may decline.

OMIDRIA is our only product that has been approved by the FDA for commercial sale in the U.S. and broad-based

product sales began in April 2015. For the three and twelve months ended December 31, 2015, we recorded net sales of
OMIDRIA of $6.7 million and $13.3 million, respectively. We have not generated revenue from sales of OMIDRIA to date that
are sufficient to fund fully our operations and cannot provide assurance that we will generate sufficient revenue from
OMIDRIA in the future to fund fully our operations. We will need to generate substantially more product revenue from
OMIDRIA to achieve and sustain profitability. Our ability to generate significant revenue from OMIDRIA product sales
depends on our ability to achieve increased market acceptance of, and to otherwise market and sell effectively, OMIDRIA,
which may not occur for a number of reasons, including:

•

a lack of acceptance by physicians, patients, government and private payers and other members of the medical
community;

our limited experience in marketing, selling and distributing OMIDRIA or any other product;

our limited experience managing third-party commercial manufacturing of OMIDRIA or any other product as well as
our limited experience managing and maintaining a commercial sales organization;

pricing, reimbursement and coverage policies of government and private payers such as Medicare, Medicaid, the
Department of Veterans Affairs, or VA, group purchasing organizations, insurance companies, health maintenance
organizations and other plan administrators;

the availability, relative price and efficacy of the product as compared to alternative treatment options or branded,
compounded or generic competing products;

an unknown safety risk;

the failure to enter into and maintain acceptable partnering arrangements for marketing and distribution of OMIDRIA
outside of the U.S.;

changed or increased regulatory restrictions in the U.S., EU and other foreign territories; and

a lack of adequate financial or other resources.

Our operating results are unpredictable and may fluctuate.

Our operating results are difficult to predict and will likely fluctuate from quarter to quarter and year to year. We believe

that our quarterly and annual results of operations may be affected by a variety of factors, including:

•

the level and timing of commercial sales of OMIDRIA as well as our product candidates, if and when approved or
commercialized;

the extent of coverage and reimbursement for OMIDRIA, including following the expiration of pass-through
reimbursement effective January 1, 2018, and the amount of OMIDRIA chargebacks, rebates and product returns;

the extent of any payments received from collaboration arrangements and development funding as well as the
achievement of development and clinical milestones under collaboration and license agreements that we may enter
into from time to time and that may vary significantly from quarter to quarter; and

the timing, cost and level of investment in our research and development activities as well as expenditures we will or
may incur to acquire or develop additional technologies, products and product candidates.

In addition, the number of procedures in which OMIDRIA or any of our product candidates, if commercialized, would be used
may be significantly less than the total number of such procedures performed or total possible market size. These and other
factors, including our limited history of product sales, may make it difficult for us to forecast and provide accurate guidance
(including updates to prior guidance) related to our expected financial performance. If our operating results are below the
expectations of securities analysts or investors, the trading price of our stock could decline.

We have incurred cumulative operating losses since inception. If we are unable to raise additional capital when needed,
our commercial operations may be limited and we may be unable to complete the development and commercialization
of our product candidates or to continue our other preclinical development programs.

Our operations have consumed substantial amounts of cash since our incorporation and, as of December 31, 2015, we had

an accumulated deficit of approximately $403 million. We expect to continue to spend substantial amounts to:

•

continue OMIDRIA sales and marketing;

continue research and development in our programs;

• make principal and interest payments under the Oxford/EWB Loan Agreement;

•

initiate and conduct clinical trials for our programs and product candidates; and

commercialize and launch product candidates for which we may receive regulatory approval.

We expect to continue to incur additional losses until such time as we generate significant revenue from the sale of OMIDRIA,
other commercial products and/or significant partnering revenues. We are unable to predict the extent of any future losses and
cannot provide assurance that we will generate sufficient revenue from OMIDRIA in the future to fund fully our operations. To
date we have not generated revenue from sales of OMIDRIA that is sufficient to fund fully our operations. If we are unable to
generate sufficient revenue from the sale of OMIDRIA, other commercialized products and/or partnering arrangements, we
may never become and remain profitable and will be required to raise additional capital to continue to fund our operations. We
cannot be certain that additional capital will be available to us on acceptable terms, if at all, when required. Adverse
developments to our financial condition or business, as well as disruptions in the global equity and credit markets, may limit
our ability to access capital. If we do not raise additional capital when needed through one or more funding avenues, such as
corporate partnering or debt or equity financings, we may have to significantly delay, scale back or discontinue the
development or commercialization of one or more of our product candidates or one or more of our preclinical programs or
other research and development initiatives. In addition, we may be required to seek collaborators for one or more of our current
or future products at an earlier stage than otherwise would be desirable or on terms that are less favorable than otherwise might
be available or to relinquish or license on unfavorable terms our rights to technologies or products that we otherwise would
seek to develop or commercialize ourselves. We also may have insufficient funds or otherwise be unable to advance our
preclinical programs, such as potential new drug targets developed from our GPCR program, to a point where they can generate
revenue through partnerships, collaborations or other arrangements. Any of these actions could limit the amount of revenue we
are able to generate and harm our business and prospects.

Our independent registered public accounting firm has indicated that our financial condition raises substantial doubt as
to our ability to continue as a going concern.

Our financial statements have been prepared assuming that we will continue to operate as a going concern, which

contemplates the realization of assets and the satisfaction of liabilities in the normal course of business. However, our
independent registered public accounting firm has included in its audit opinion for the year ended December 31, 2015 a
statement that there is substantial doubt as to our ability to continue as a going concern as a result of our recurring losses and

financial condition on December 31, 2015. Our ability to continue as a going concern will require us to generate positive cash
flow from operations, obtain additional financing, enter into strategic alliances and/or sell assets. The reaction of investors to
the inclusion of a going concern statement by our auditors, our current lack of cash resources and our potential inability to
continue as a going concern may materially adversely affect our share price and our ability to raise new capital, enter into
strategic alliances and/or make our scheduled debt payments on a timely basis or at all. If we become unable to continue as
a going concern, we may have to liquidate our assets and the values we receive for our assets in liquidation or dissolution could
be significantly lower than the values reflected in our financial statements.

If OMIDRIA or any other product that we develop and commercialize does not receive adequate reimbursement from
governments or private payers, or if we do not establish and maintain market-acceptable pricing for OMIDRIA or those
commercialized products, our prospects for revenue and profitability could suffer.

Our future revenues and profitability will depend heavily on the pricing, availability and duration of adequate

reimbursement for the use of products that we or our third-party business partners commercialize, including OMIDRIA, from
government, private and other third-party payers, both in the U.S. and in other countries. OMIDRIA or any other product that
we bring to market may not be considered cost-effective and/or the amount reimbursed for any product may be insufficient to
allow us to sell the product profitably. Obtaining reimbursement approval for any product from each government or third-party
payer can be a time-consuming and costly process that may require the build-out of a sufficient staff or the engagement of third
parties and could require us to provide supporting scientific, clinical and cost-effectiveness data for the use of our approved
products to each payer. We can provide no assurances at this time regarding the cost-effectiveness of OMIDRIA, OMS103 or
any of our product candidates. Further, we can provide no assurance that the amounts, if any, reimbursed to surgical facilities
for utilization of any of our surgery-related products, including OMIDRIA, any of our product candidates or OMS103, or to
surgeons for the administration and delivery of these products or product candidates will be considered adequate to justify the
use of these products or product candidates. In addition, obtaining acceptable coverage and reimbursement from one payer does
not guarantee that we will obtain similar acceptable coverage or reimbursement from another payer.

There may be significant delays in obtaining reimbursement for newly approved products, and we may not be able to

provide data sufficient to be granted reimbursement. Even when a payer determines that a product is eligible for
reimbursement, coverage may be limited to the uses of a product that are either approved by the FDA (or, in other countries, the
relevant country’s regulatory agency) and/or appear in a recognized drug compendium, and other conditions may apply.
Moreover, eligibility for coverage does not mean that any product will be reimbursed at a rate that allows us to make a profit in
all cases or at a rate that covers our costs, including research, development, manufacturing, sales and distribution. Increasingly,
government and private third-party payers that reimburse for healthcare services and products are requiring that companies
provide them with predetermined discounts from list prices and challenging the prices charged for medical products, which
could adversely impact the pricing of our products. Pricing may also be adversely affected by changes in the terms, scope and/
or complexity of government pricing requirements. Even if we receive reimbursement for a product, the initial rate or method
at which the product will be reimbursed could become unfavorable to us at the time reimbursement is initiated or in the future
or may be of a limited duration. After the expiration of pass-through reimbursement status for OMIDRIA effective January 1,
2018, we may not be able to maintain or obtain adequate reimbursement for OMIDRIA.

In non-U.S. jurisdictions, we must obtain separate reimbursement approvals and comply with related foreign legal and

regulatory requirements. In some countries, including those in the EU, our products may be subject to government price
controls. Pricing negotiations with governmental authorities can take a considerable amount of time and expenditure of
resources after the receipt of marketing approval for a product. We provide no assurances that the price of any product in one or
more of these countries or regions will allow us to make a profit or cover our costs, including research, development,
manufacturing, sales and distribution, and as a result we may decide to delay, potentially indefinitely, initiating sales in the
particular country or region.

If the reimbursement or pricing that we are able to obtain and maintain for any product that we develop and

commercialize, including OMIDRIA, is inadequate in light of our development and other costs, is significantly delayed or
subject to overly restrictive conditions, or is denied by one or more payers, there could be a material adverse effect on our
business, financial condition, results of operations and growth prospects.

We are subject to extensive government regulation and the failure to comply with these regulations may have a material
adverse effect on our operations and business.

Both before and after approval of any product, we and our suppliers, contract manufacturers and clinical investigators are

subject to extensive regulation by governmental authorities in the U.S. and other countries, covering, among other things,
testing, manufacturing, quality control, clinical trials, post-marketing studies, labeling, advertising, promotion, distribution,
import and export, governmental pricing, price reporting and rebate requirements. Failure to comply with applicable

requirements could result in one or more of the following actions: warning letters; unanticipated expenditures; delays in
approval or refusal to approve a product candidate; product recall or seizure; interruption of manufacturing or clinical trials;
operating or marketing restrictions; injunctions; criminal prosecution and civil or criminal penalties including fines and other
monetary penalties; adverse publicity; and disruptions to our business. Further, government investigations into potential
violations of these laws would require us to expend considerable resources and face adverse publicity and the potential
disruption of our business even if we are ultimately found not to have committed a violation.

Obtaining FDA approval of our product candidates requires substantial time, effort and financial resources and may be
subject to both expected and unforeseen delays, and there can be no assurance that any approval will be granted on any of our
product candidates on a timely basis, if at all. The FDA may decide that our data are insufficient for approval of our product
candidates and require additional preclinical, clinical or other studies or additional work related to chemistry, manufacturing
and controls. In addition, we, the FDA or an independent Institutional Review Board or Ethics Committee may suspend or
terminate human clinical trials at any time on various grounds, including a finding that the patients are or would be exposed to
an unacceptable health risk or because of the way in which the investigators on which we rely carry out the trials. If we are
required to conduct additional trials or to conduct other testing of our product candidates beyond that which we currently
contemplate for regulatory approval, if we are unable to complete successfully our clinical trials or other testing, or if the
results of these and other trials or tests fail to demonstrate efficacy or raise safety concerns, we may face substantial additional
expenses, be delayed in obtaining marketing approval for our product candidates or may never obtain marketing approval.

We are also required to comply with extensive governmental regulatory requirements after a product has received
marketing authorization. Governing regulatory authorities may require post-marketing studies that may negatively impact the
commercial viability of a product. Once on the market, a product may become associated with previously undetected adverse
effects and/or may develop manufacturing difficulties. As a result of any of these or other problems, a product’s regulatory
approval could be withdrawn, which could harm our business and operating results. In addition, we must establish and maintain
an effective healthcare compliance program in order to comply with U.S. and other laws applicable to marketed drug products.
Implementing an effective compliance program requires the expenditure of significant time and resources. If we are found to be
in violation of any of these laws, we may be subject to significant penalties, including civil or criminal penalties, damages and
fines as well as exclusion from government healthcare programs.

Failure to obtain regulatory approval in foreign jurisdictions would prevent us from marketing our products
internationally.

We intend to have OMIDRIA and our product candidates, if approved, marketed outside the U.S. In order to market our

products in non-U.S. jurisdictions, we must obtain separate regulatory approvals and comply with numerous and varying
regulatory requirements. The regulatory approval procedure varies among countries and can involve additional testing and data
review. The requirements governing marketing authorization, the conduct of clinical trials, pricing and reimbursement vary
from country to country. Approval by the FDA or EC does not ensure approval by regulatory agencies in other jurisdictions,
and approval by one foreign regulatory authority does not ensure approval by regulatory agencies in other foreign countries or
by the FDA. The time required to obtain regulatory approval outside the U.S. and EU may differ from that required to obtain
FDA or EMA approval. The foreign regulatory approval process may include all of the risks associated with obtaining FDA
approval discussed in these “Risk Factors” and we may not obtain foreign regulatory approvals on a timely basis, or at all.

We currently depend on a third party for the commercialization of OMS103 and we cannot guarantee that such
commercialization will occur or be successful.

In June 2015 we entered into the OMS103 Agreement pursuant to which we granted Fagron an exclusive, royalty-free
license to the OMS103 intellectual property, manufacturing information and clinical data to manufacture and commercialize
OMS103 in the U.S. in exchange for potential future payments based on product revenue and achievement of commercial
milestones. As a result of entering into the OMS103 Agreement, we discontinued our OMS103 clinical development program
and are dependent on Fagron to commercialize OMS103 in the U.S. We cannot control whether Fagron will fulfill its
obligations under the OMS103 Agreement or whether the commercialization of OMS103 will be successful. Fagron has not
met the diligence milestones in the OMS103 Agreement, including initiating sales of OMS103, and we are currently evaluating
our options with respect to the OMS103 Agreement and the OMS103 program. If we elect to pursue arbitration with Fagron,
and/or the OMS103 Agreement is terminated, we can provide no assurances that we will be able to enter into another licensing
agreement or have sufficient resources to restart clinical development and conduct any clinical trials if desired. Any of the
above risks, if realized, could adversely affect our results of operations.

Under Section 503B of the FDCA, registered outsourcing facilities are required to manufacture under GMP and are
subject to FDA inspections and audits. They also are not allowed to manufacture a product that is essentially a copy of one or
more FDA-approved drugs. If a licensed registered outsourcing facility such as Fagron is prohibited from commercializing or

from continuing commercial sales of OMS103 following initial commercialization because of violations of any FDA
regulations or any other reason, our ability to generate revenue from royalty payments from the licensed registered outsourcing
facility and achieve profitability will be adversely affected and the market price of our common stock could decline.

We have no internal capacity to manufacture clinical or commercial supplies of OMIDRIA or our product candidates
and intend to rely solely on third-party manufacturers. If the contract manufacturers that we rely on experience
difficulties manufacturing OMIDRIA or our product candidates or fail FDA or other regulatory inspections, our clinical
trials, regulatory submissions and ability to sell OMIDRIA or any other commercialized product and generate revenue
may be significantly limited or delayed.

We rely and intend to continue to rely on third party manufacturers to produce commercial quantities of OMIDRIA and

clinical drug supplies of our product candidates that are needed for clinical trials. We cannot provide any assurance that we will
be able to enter into or maintain these types of arrangements on commercially reasonable terms, or at all. If we or the
manufacturer were to terminate one of these arrangements early, or the manufacturer was unable to supply product quantities
sufficient to meet our requirements, we would be required to transfer the manufacturing to an approved alternative facility and/
or establish additional manufacturing and supply arrangements. We may also need to establish additional or replacement
manufacturers, potentially with little or no notice, in the event that one of our manufacturers fails to comply with FDA and/or
other pharmaceutical manufacturing regulatory requirements. Even if we are able to establish additional or replacement
manufacturers, identifying these sources and entering into definitive supply agreements and obtaining regulatory approvals may
require a substantial amount of time and cost and may create a shortage of the product. Such alternate supply arrangements may
not be available on commercially reasonable terms, or at all. Additionally, if we are unable to engage multiple suppliers to
manufacture our products, we may have inadequate supply to meet the demand of our product.

Our contract manufacturers may encounter difficulties with formulation and manufacturing processes that could result in
delays in clinical trials and/or regulatory submissions or that could impact adversely the commercialization of our products or
product candidates, as well as in the initiation of enforcement actions by the FDA and other regulatory authorities. These
difficulties also could result in the recall or withdrawal of a product from the market or a failure to have adequate supplies to
meet market demand. If the safety of OMIDRIA or any product candidate supplied by contract manufacturers is compromised
due to one or more of those contract manufacturers’ failure to adhere to applicable laws or for other reasons, we may not be
able to maintain regulatory approval of OMIDRIA, to continue sales and marketing of OMIDRIA or to obtain and maintain
regulatory approval for one or more of our product candidates, which would harm our business and prospects significantly.

In addition, any product candidate from our MASP-2, MASP-3 or Plasmin programs could be a biologic drug product,

and we do not have the internal capability to produce biologics for use in clinical trials or on a commercial scale. There are only
a limited number of manufacturers of biologic drug products and we cannot be certain that we can enter into supply agreements
with them on commercially reasonable terms, if at all. Any significant delays in the manufacture of clinical or commercial
supplies could materially harm our business, financial condition, results of operations and prospects.

Manufacturing under our existing OMIDRIA manufacturing agreement with Patheon, which is for a specific facility,
ceased at the end of 2015. Validation of the manufacturing process for OMIDRIA under our Hospira supply agreement has not
been completed. We do not expect that any OMIDRIA manufacturing facility will be approved for production before 2017. We
anticipated this transition and increased production of OMIDRIA prior to the break in manufacturing, and believe that we will
have sufficient supply to meet product needs until OMIDRIA product production is recommenced. However, we can provide no
assurances if or when the Hospira manufacturing facility or a second manufacturing facility for OMIDRIA will be in
production or whether we can meet market demand for OMIDRIA if demand is greater than we anticipate. Additionally, the
damage to or destruction of OMIDRIA inventory, including inventory warehoused at our third-party logistics provider, could
also adversely affect our ability to meet market demand. We have obtained insurance coverage for the replacement cost of
damaged or destroyed OMIDRIA inventory but such coverage would not compensate us for any resulting loss of sales revenue
or a reduction in gross margin.

Ingredients, excipients and other materials necessary to manufacture OMIDRIA or our product candidates may not be
available on commercially reasonable terms, or at all, which may adversely affect the development and
commercialization of OMIDRIA or those product candidates.

We and our third-party manufacturers must obtain from third-party suppliers the active pharmaceutical ingredients,
excipients and primary and secondary packaging materials necessary for our contract manufacturers to produce OMIDRIA and
our PharmacoSurgery product candidates for our clinical trials and, to the extent approved or commercialized, for commercial
distribution. Although we have entered or intend to enter into agreements with third-party suppliers that will guarantee the
availability and timely delivery of active pharmaceutical ingredients, excipients and materials for OMIDRIA and our
PharmacoSurgery product candidates, we have not yet entered into agreements for the supply of all such ingredients, excipients

or materials, and we may be unable to secure all such supply agreements or guarantees on commercially reasonable terms, if at
all. Even if we were able to secure such agreements or guarantees, our suppliers may be unable or choose not to provide us the
ingredients, excipients or materials in a timely manner or in the quantities required. If we or our third-party manufacturers are
unable to obtain the quantities of these ingredients, excipients or materials that are necessary for the manufacture of
commercial supplies of OMIDRIA, our ability to generate revenue from the sale of OMIDRIA would be materially and
adversely affected. Further, if we or our third-party manufacturers are unable to obtain active pharmaceutical ingredients,
excipients and materials as necessary for our clinical trials or for the manufacture of commercial supplies of our product
candidates, if approved, potential regulatory approval or commercialization would be delayed, which would materially and
adversely affect our ability to generate revenue from the sale of our product candidates.

If our clinical trials are delayed, suspended or terminated, we may be unable to develop our product candidates on a
timely basis, which would adversely affect our ability to obtain regulatory approvals, increase our development costs
and delay or prevent commercialization of approved products.

We cannot predict whether we will encounter problems with any of our completed, ongoing or planned clinical trials that

will cause regulatory agencies, Institutional Review Boards or Ethics Committees, or us to delay our clinical trials or suspend
or delay the analysis of the data from those trials. Clinical trials can be delayed for a variety of reasons, including:

•

discussions with the FDA, the EMA or other foreign authorities regarding the scope or design of our clinical trials;

delays or the inability to obtain required approvals from Institutional Review Boards, Ethics Committees or other
responsible entities at clinical sites selected for participation in our clinical trials;
delays in enrolling patients into clinical trials for any reason including disease severity, trial protocol design, study
eligibility criteria, patient population size (e.g., for orphan diseases or for some pediatric indications), proximity and/or
availability of clinical trial sites for prospective patients, availability of competing therapies and clinical trials, regional
differences in diagnosis and treatment, perceived risks and benefits of the product or product candidate, physician
patient referral practices or the ability to monitor patients adequately before and after treatment;

lower than anticipated retention rates of patients in clinical trials;

the need to repeat or conduct additional clinical trials as a result of inconclusive or negative results, failure to replicate
positive early clinical data in subsequent clinical trials, poorly executed testing, a failure of a clinical site to adhere to
the clinical protocol, an unacceptable study design or other problems;

adverse findings in clinical or nonclinical studies related to the safety of our product candidates in humans;

an insufficient supply of product candidate materials or other materials necessary to conduct our clinical trials;

the need to qualify new suppliers of product candidate materials for FDA and foreign regulatory approval;

an unfavorable inspection or review by the FDA or other regulatory authority of a clinical trial site or records of any
clinical investigation;

the occurrence of unacceptable drug-related side effects or adverse events experienced by participants in our clinical
trials;

the suspension by a regulatory agency of a trial put on a clinical hold; and

the amendment of clinical trial protocols to reflect changes in regulatory requirements and guidance or other reasons
as well as subsequent re-examination of amendments of clinical trial protocols by Institutional Review Boards or
Ethics Committees.

In addition, a clinical trial or development program may be suspended or terminated by us, the FDA or other regulatory

authorities, or Institutional Review Boards or Ethics Committees due to a number of factors, including:

•

failure to conduct the clinical trial in accordance with regulatory requirements or our clinical protocols;

inspection of the clinical trial operations or trial sites by the FDA or other regulatory authorities resulting in the
imposition of a clinical hold;

the failure to remove a clinical hold in a timely manner (which we cannot predict with certainty), if at all;

unforeseen safety issues or any determination that a trial presents unacceptable health risks; or

lack of adequate funding to continue the clinical trial or development program, including the incurrence of unforeseen
costs due to enrollment delays, requirements to conduct additional trials and studies and increased expenses associated
with the services of our contract research organizations, or CROs, and other third parties.

If the results of our clinical trials are not available when we expect or if we encounter any delay in the analysis of data

from our clinical trials, we may be unable to file for regulatory approval or conduct additional clinical trials on the schedule we
currently anticipate. Many of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials

may also ultimately lead to the denial of regulatory approval of a product candidate. Any delays in completing our clinical trials
could increase our development costs, could slow down our product development and regulatory submission process, could
delay our receipt of product revenue and could make it difficult to raise additional capital. In addition, significant clinical trial
delays also could allow our competitors to bring products to market before we do and impair our ability to commercialize our
future products, potentially harming our business.

Because we have a number of product candidates and development programs, we may expend our limited resources to
pursue a particular product candidate or indication and fail to capitalize on product candidates or indications for which
there is a greater likelihood of obtaining regulatory approval and that may be more profitable, if approved.

We do not have unlimited resources and must focus on the product candidates and clinical and preclinical development
programs that we believe are the most promising. As a result, we may forego or delay the pursuit of opportunities with other
product candidates or other indications that later prove to have greater commercial potential and may not be able to progress
development programs as rapidly as otherwise possible. Further, if we do not accurately evaluate the commercial potential or
target market for a particular product candidate, we may relinquish valuable rights to that product through collaboration, license
or other royalty arrangements in cases in which it would have been advantageous for us to retain sole development and
commercialization rights.

It is difficult and costly to protect our intellectual property and our proprietary technologies, and we may not be able to
ensure their protection.

Our commercial success will depend in part on obtaining and maintaining patent protection and trade secret protection for

the use, formulation and structure of our products and product candidates, the methods used to manufacture them, the related
therapeutic targets and associated methods of treatment as well as on successfully defending these patents against potential
third-party challenges. Our ability to protect our products and product candidates from unauthorized making, using, selling,
offering to sell or importing by third parties is dependent on the extent to which we have rights under valid and enforceable
patents that cover these activities.

The patent positions of pharmaceutical, biotechnology and other life sciences companies can be highly uncertain and
involve complex legal and factual questions for which important legal principles remain unresolved. Changes in either the
patent laws or in interpretations of patent laws in the U.S. and other countries may diminish the value of our intellectual
property. Further, the determination that a patent application or patent claim meets all of the requirements for patentability is a
subjective determination based on the application of law and jurisprudence. The ultimate determination by the USPTO or by a
court or other trier of fact in the U.S., or corresponding foreign national patent offices or courts, on whether a claim meets all
requirements of patentability cannot be assured. Although we have conducted searches for third-party publications, patents and
other information that may affect the patentability of claims in our various patent applications and patents, we cannot be certain
that all relevant information has been identified. Accordingly, we cannot predict the breadth of claims that may be allowed or
enforced in our patents or patent applications, in our licensed patents or patent applications or in third-party patents.

We cannot provide assurances that any of our patent applications will be found to be patentable, including over our own

prior art patents, or will issue as patents. Neither can we make assurances as to the scope of any claims that may issue from our
pending and future patent applications nor to the outcome of any proceedings by any potential third parties that could challenge
the patentability, validity or enforceability of our patents and patent applications in the U.S. or foreign jurisdictions. Any such
challenge, if successful, could limit patent protection for our products and product candidates and/or materially harm our
business.

The degree of future protection for our proprietary rights is uncertain because legal means afford only limited protection

and may not adequately protect our rights or permit us to gain or keep our competitive advantage. For example:

• we may not be able to generate sufficient data to support full patent applications that protect the entire breadth of

developments in one or more of our programs, including our GPCR program;

•

it is possible that one or more of our pending patent applications will not become an issued patent or, if issued, that the
patent(s) will be sufficient to protect our technology, provide us with a basis for commercially viable products or
provide us with any competitive advantages;

if our pending applications issue as patents, they may be challenged by third parties as not infringed, invalid or
unenforceable under U.S. or foreign laws; or

if issued, the patents under which we hold rights may not be valid or enforceable.

In addition, to the extent that we are unable to obtain and maintain patent protection for one of our products or product

candidates or in the event that such patent protection expires, it may no longer be cost-effective to extend our portfolio by
pursuing additional development of a product or product candidate for follow-on indications.

We also may rely on trade secrets to protect our technologies or products, especially where we do not believe patent

protection is appropriate or obtainable. However, trade secrets are difficult to protect. Although we use reasonable efforts to
protect our trade secrets, our employees, consultants, contractors, outside scientific collaborators and other advisers may
unintentionally or willfully disclose our information to competitors. Enforcing a claim that a third-party entity illegally
obtained and is using any of our trade secrets is expensive and time-consuming, and the outcome is unpredictable. In addition,
courts outside the U.S. are sometimes less willing to protect trade secrets. Moreover, our competitors may independently
develop equivalent knowledge, methods and know-how.

We may incur substantial costs as a result of litigation or other proceedings relating to patent and other intellectual
property rights.

If we choose to go to court to stop someone else from using our inventions, that individual or company has the right to

ask the court to rule that the underlying patents are invalid or should not be enforced against that third party. These lawsuits are
expensive and would consume time and other resources even if we were successful in stopping the infringement of these
patents. We expect to incur substantial costs in connection with our lawsuit against Par. In addition, our lawsuit against such an
entity could result in a finding that some or all of the claims of one or more of our relevant patents are invalid, unenforceable
and/or not infringed, and could also result in a generic version of OMIDRIA being launched after the expiration of the
mandatory three-year clinical data exclusivity for OMIDRIA. An adverse outcome in such legal action could have a material
negative effect on our financial condition, results of operations and/or stock price.

There is also the risk that, even if the validity of these patents is upheld, the court will refuse to stop the other party on the

ground that such other party’s activities do not infringe the patents. It may not be feasible to detect and undertake patent
enforcement action to stop infringing activity by a number of individual entities, each on a small scale, such as compounding
pharmacies. Further, our industry has produced a large number of patents and it is not always clear which patents cover various
types of products or methods of use. A third party may claim that we or our contract manufacturers are using inventions
covered by the third party’s patent rights and may go to court to stop us from engaging in the alleged infringing activity,
including making, using or selling our products and product candidates. These lawsuits are costly and could affect our results of
operations and divert the attention of managerial and technical personnel. There is a risk that a court would decide that we, or
our contract manufacturers, are infringing the third party’s patents and would order us or our contractors to stop the activities
covered by the patents. In addition, if we or our contract manufacturers are found to have violated a third party’s patent, we or
our contract manufacturers could be ordered to pay damages to the other party. We have agreed to or may agree to indemnify
our contract manufacturers against certain patent infringement claims and thus may be responsible for any of their costs
associated with such claims and actions. If we were sued for patent infringement, we would need to demonstrate that our
products and product candidates or methods of use either do not infringe the patent claims of the relevant patent or that the
patent claims are invalid, and we be unable to do this. Proving invalidity, in particular, is difficult since it requires clear and
convincing evidence to overcome the presumption of validity enjoyed by issued patents.

Although we have conducted searches of third-party patents with respect to our programs, we have not obtained written

freedom to operate opinions for our programs and may not have identified all relevant third-party patents. Consequently, we
cannot be certain that third-party patents containing claims covering our products, product candidates, programs, technologies
or methods do not exist, have not been filed, or could not be filed or issued.

Some of our competitors may be able to sustain the costs of complex patent litigation more effectively than we can
because they have substantially greater resources. In addition, any uncertainties resulting from the initiation and continuation of
any litigation could have a material adverse effect on our ability to raise the capital necessary to continue our operations.

Our competitors may develop products that are less expensive, safer or more effective, or which may otherwise diminish
or eliminate the commercial success of any products that we may commercialize.

We may not achieve commercial success if our competitors, many of whom have significantly more resources and
experience than we, market products that are safer, more effective, less expensive or faster to reach the market than OMIDRIA
or any future products that we may develop and commercialize. Our competitors also may market a product that proves to be
unsafe or ineffective, which may affect the market for our competing product, or future product, regardless of the safety or
efficacy of our product. The failure of OMIDRIA or any other future product that we may market to effectively compete with
products marketed by our competitors would impair our ability to generate revenue, which would have a material adverse effect
on our future business, our financial condition and our results of operations.

The loss of members of our management team could substantially disrupt our business operations.

Our success depends to a significant degree on the continued individual and collective contributions of our management

team. The members of our management team are at-will employees, and we do not maintain any key-person life insurance

policies other than on the life of Gregory A. Demopulos, M.D., our president, chief executive officer and chairman of the board
of directors. Losing the services of any key member of our management team, whether from death or disability, retirement,
competing offers or other causes, without having a readily available and appropriate replacement could delay the execution of
our business strategy, cause us to lose a strategic partner, or otherwise materially affect our operations.

We rely on highly skilled personnel and, if we are unable to retain or motivate key personnel or hire qualified personnel,
we may not be able to maintain our operations or grow effectively.

Our performance is largely dependent on the talents and efforts of highly skilled individuals. Our future success depends

on our continuing ability to identify, hire, develop, motivate and retain highly skilled personnel for all areas of our organization.
If we are unable to hire and train a sufficient number of qualified employees for any reason, we may not be able to implement
our current initiatives or grow effectively. We have in the past maintained a rigorous, highly selective and time-consuming
hiring process. We believe that our approach to hiring has significantly contributed to our success to date. If we do not succeed
in attracting qualified personnel and retaining and motivating existing personnel, our existing operations may suffer and we
may be unable to grow effectively.

We may encounter difficulties managing our growth, which could delay our business plans or adversely affect our
results of operations.

To manage our anticipated future growth, we must continue to implement and improve our managerial, operational and

financial systems and continue to recruit and train additional qualified personnel. Due to our limited financial resources, we
may not be able to manage effectively the expansion of our operations or recruit and train additional qualified personnel. The
physical expansion of our operations may lead to significant costs and may divert our management and business development
resources. Any inability to manage growth could delay the execution of our business plans or disrupt our operations.
Additionally, our inability to manage growth effectively could cause our operating costs to grow even faster than we currently
are anticipating.

Product liability claims may damage our reputation and, if insurance proves inadequate, these claims may harm our
business.

We may be exposed to the risk of product liability claims that is inherent in the biopharmaceutical industry. A product

liability claim may damage our reputation by raising questions about our product’s safety and efficacy and could limit our
ability to sell one or more products by preventing or interfering with commercialization of our products and product candidates.
In addition, product liability insurance for the biopharmaceutical industry is generally expensive to the extent it is available at
all. There can be no assurance that we will be able to obtain or maintain such insurance on acceptable terms or that we will be
able to secure and maintain increased coverage if the commercialization of OMIDRIA or our product candidates progresses, or
that future claims against us will be covered by our product liability insurance. Further, our product liability insurance coverage
may not reimburse us or may be insufficient to reimburse us for any or all expenses or losses we may suffer. A successful claim
against us with respect to uninsured liabilities or in excess of insurance coverage could have a material adverse effect on our
business, financial condition and results of operations.

Our preclinical programs may not produce product candidates that are suitable for clinical trials or that can be
successfully commercialized or generate revenue through partnerships.

We must complete successfully preclinical testing, which may include demonstrating efficacy and the lack of toxicity in
established animal models, before commencing clinical trials for any product candidate. Many pharmaceutical and biological
products do not successfully complete preclinical testing and, even if preclinical testing is successfully completed, may fail in
clinical trials. In addition, there can be no assurance that positive results from preclinical studies will be predictive of results
obtained from subsequent preclinical studies or clinical trials. We also cannot be certain that any product candidates that do
advance into clinical trials will successfully demonstrate safety and efficacy in clinical trials. Even if we achieve positive
results in early clinical trials, they may not be predictive of the results in later trials.

We rely on third parties to conduct portions of our preclinical research and clinical trials. If these third parties do not
perform as contractually required or otherwise expected, or if we fail to adequately supervise or monitor these parties,
we may not be able to obtain regulatory approval for or commercialize our product candidates.

We rely on third parties, such as CROs, medical and research institutions and clinical investigators, to conduct a portion

of our preclinical research and assist us in conducting our clinical trials. Nonetheless, we are responsible for confirming that
our preclinical research and clinical trials are conducted in accordance with applicable regulations, the relevant trial protocol
and within the context of approvals by an Institutional Review Board or Ethics Committee, and we may not always be
successful in ensuring such compliance. Our reliance on these third parties does not relieve us of responsibility for ensuring

compliance with FDA and other regulations and standards for conducting, monitoring, recording and reporting the results of
preclinical research and clinical trials to assure that data and reported results are credible and accurate and that the trial
participants are adequately protected. If these third parties do not successfully carry out their contractual duties or regulatory
obligations or meet expected deadlines, if the third parties need to be replaced or if the quality or accuracy of the data they
obtain is compromised due to their failure to adhere to our clinical protocols or regulatory requirements or for other reasons,
our preclinical and clinical development processes may be extended, delayed, suspended or terminated, and we may not be able
to commercialize or obtain regulatory approval for our product candidates.

We may need to maintain licenses for active ingredients from third parties to develop and commercialize some of our
product candidates, which could increase our development costs and delay our ability to commercialize those product
candidates.

Should we decide to use active pharmaceutical ingredients in any of our product candidates that are proprietary to one or

more third parties, such as our PDE7 program (OMS527) or our plasmin program (OMS616), we would need to maintain
licenses to those active ingredients from those third parties. If we are unable to continue to access rights to these active
ingredients prior to conducting preclinical toxicology studies intended to support clinical trials, we may need to develop
alternate product candidates from these programs by either accessing or developing alternate active ingredients, resulting in
increased development costs and delays in commercialization of these product candidates. If we are unable to maintain
continued access rights to the desired active ingredients on commercially reasonable terms or develop suitable alternate active
ingredients, we may not be able to commercialize product candidates from these programs.

The terms of our debt facility place restrictions on our operating and financial flexibility and, if we raise additional
capital through debt financing, the terms of any new debt could further restrict our ability to operate our business.

We have borrowed $50.0 million under the Oxford/EWB Loan Agreement. As collateral for this loan, we pledged
substantially all of our assets other than intellectual property (with the exception of the proceeds derived from any intellectual
property). The Oxford/EWB Loan Agreement restricts our ability to, among other things, incur indebtedness, grant liens,
dispose of assets, make investments, make acquisitions, enter into certain transactions with affiliates, pay dividends or make
distributions, repurchase stock, license our intellectual property for a limited set of our programs without lender approval,
pledge our intellectual property and engage in significant business transactions such as a change of control. Any of these
restrictions could significantly limit our operating and financial flexibility and ability to respond to changes in our business or
competitive activities. The Oxford/EWB Loan Agreement also requires us to achieve certain minimum net revenue amounts
from OMIDRIA through the end of 2018 and to maintain at least $10.0 million in cash and cash equivalents during the term of
the Oxford/EWB Loan Agreement. The failure to satisfy these or other obligations under the Oxford/EWB Loan Agreement
would allow the lenders to declare a default. If we default under the Oxford/EWB Loan Agreement, the lenders may have the
right to accelerate all of our repayment obligations under the Oxford/EWB Loan Agreement and to take control of our pledged
assets, which include our cash, cash equivalents and short-term investments. Further, if we are liquidated, the lenders’ right to
repayment would be senior to the rights of the holders of our common stock to receive any proceeds from the liquidation. An
event of default under the Oxford/EWB Loan Agreement includes the occurrence of any material adverse effect upon our
business operations, properties, assets, results of operations or financial condition, taken as a whole with respect to our
viability, that would reasonably be expected to result in our inability to repay the loan. If either lender declares all obligations
under the Oxford/EWB Loan Agreement immediately due and payable upon the occurrence of any event that the lender
interprets as constituting an event of default as defined under the Oxford/EWB Loan Agreement, including but not limited to
the lender concluding that a material adverse change has occurred as defined under the Oxford/EWB Loan Agreement, we will
be required to repay the loan immediately or to attempt to reverse the declaration through negotiation or litigation. Any
declaration of an event of default could significantly harm our business and prospects and could cause our stock price to
decline. If we raise any additional debt financing, the terms of such debt could further restrict our operating and financial
flexibility.

We use hazardous materials in our business and must comply with environmental laws and regulations, which can be
expensive.

Our research operations produce hazardous waste products, which include chemicals and radioactive and biological
materials. We are subject to a variety of federal, state and local regulations relating to the use, handling, storage and disposal of
these materials. Although we believe that our safety procedures for handling and disposing of these materials comply with
applicable legal regulations, the risk of accidental contamination or injury from these materials cannot be eliminated. We
generally contract with third parties for the disposal of such substances and store our low-level radioactive waste at our facility
until the materials are no longer considered radioactive. We may be required to incur further costs to comply with current or
future environmental and safety regulations. In addition, although we carry insurance, in the event of accidental contamination

or injury from these materials, we could be held liable for any damages that result and any such liability could exceed our
insurance coverage and other resources.

Cyber-attacks or other failures in telecommunications or information technology systems could result in information
theft, data corruption and significant disruption of our business operations.

We utilize information technology, or IT, systems and networks to process, transmit and store electronic information in

connection with our business activities. As use of digital technologies has increased, cyber incidents, including deliberate
attacks and attempts to gain unauthorized access to computer systems and networks, have increased in frequency and
sophistication. These threats pose a risk to the security of our systems and networks, the confidentiality and the availability and
integrity of our data. There can be no assurance that we will be successful in preventing cyber-attacks or successfully
mitigating their effects. Similarly, there can be no assurance that our collaborators, CROs, third-party logistics providers,
distributors and other contractors and consultants will be successful in protecting our clinical and other data that is stored on
their systems. Any cyber-attack or destruction or loss of data could have a material adverse effect on our business and
prospects. In addition, we may suffer reputational harm or face litigation or adverse regulatory action as a result of cyber-
attacks or other data security breaches and may incur significant additional expense to implement further data protection
measures.

Risks Related to Our Common Stock

Our stock price has been and may continue to be volatile, and the value of an investment in our common stock may
decline.

During the 12-month period ended December 31, 2015, our stock traded as high as $30.23 per share and as low as $10.48

per share. The trading price of our common stock is likely to continue to be highly volatile and could be subject to wide
fluctuations in response to numerous factors, many of which are beyond our control. In addition, the stock market has
experienced extreme price and volume fluctuations that have often been unrelated or disproportionate to the operating
performance of publicly traded companies. Broad market and industry factors may seriously affect the market price of
companies’ stock, including ours, regardless of actual operating performance. These fluctuations may be even more pronounced
in the trading market for our stock. In addition, in the past, following periods of volatility in the overall market and the market
price of a particular company’s securities, securities class action litigation has often been instituted against these companies.
This litigation, if instituted against us, could result in substantial costs and a diversion of our management’s attention and
resources.

If we issue additional shares of our common stock or other securities that may be convertible into, or exercisable or
exchangeable for, our common stock, our existing shareholders would experience further dilution.

To the extent that we raise additional funds by issuing equity securities, including pursuant to our Sales Agreement with

JonesTrading, our shareholders would experience dilution, which may be significant and could cause the market price of our
common stock to decline significantly. In addition, as of March 10, 2016 approximately 10.1 million shares of common stock
that are either subject to outstanding warrants or outstanding options may become eligible for sale in the public market to the
extent permitted by the provisions of various vesting agreements. In addition, as of March 10, 2016 we also have
approximately 2.2 million shares of common stock reserved for future issuance under our employee benefit plans that are not
subject to outstanding options. If the holders of these outstanding warrants and/or options to purchase our common stock elect
to exercise some or all of them, or if the shares subject to our employee benefit plans are issued and become eligible for sale in
the public market, our shareholders would experience dilution and the market price of our common stock could decline.

Anti-takeover provisions in our charter documents and under Washington law could make an acquisition of us, which
may be beneficial to our shareholders, difficult and prevent attempts by our shareholders to replace or remove our
current management.

Provisions in our articles of incorporation and bylaws and under Washington law may delay or prevent an acquisition of

us or a change in our management. These provisions include a classified board of directors, a prohibition on shareholder actions
by less than unanimous written consent, restrictions on the ability of shareholders to fill board vacancies and the ability of our
board of directors to issue preferred stock without shareholder approval. In addition, because we are incorporated in
Washington, we are governed by the provisions of Chapter 23B.19 of the Washington Business Corporation Act, which, among
other things, restricts the ability of shareholders owning 10% or more of our outstanding voting stock from merging or
combining with us. Although we believe these provisions collectively provide for an opportunity to receive higher bids by
requiring potential acquirers to negotiate with our board of directors, they would apply even if an offer may be considered
beneficial by some shareholders. In addition, these provisions may frustrate or prevent any attempts by our shareholders to

replace or remove our current management by making it difficult for shareholders to replace members of our board of directors,
which is responsible for appointing the members of our management.

We have never declared or paid dividends on our capital stock, and we do not anticipate paying dividends in the
foreseeable future.

Our business requires significant funding. We currently plan to invest all available funds and future earnings, if any, in

the development and growth of our business. Additionally, under the Oxford/EWB Loan Agreement, we have agreed not to pay
any dividends. Therefore, we currently do not anticipate paying any cash dividends on our common stock in the foreseeable
future. As a result, a rise in the market price of our common stock, which is uncertain and unpredictable, will be the sole source
of potential gain for shareholders in the foreseeable future, and an investment in our common stock for dividend income should
not be relied upon.

ITEM 1B.

UNRESOLVED STAFF COMMENTS

Not applicable.

ITEM 2.

PROPERTIES

We lease approximately 83,000 square feet for our principal office and laboratory space in the building located at 201

Elliott Avenue West, Seattle, Washington, or The Omeros Building, which includes approximately 13,760 square feet of
laboratory space that we are subleasing to a third party. The lease term for our space is through November 2027. We also have
two options to extend the lease term, each by five years. The annual base rent due under the lease for our principal office and
laboratory space is $4.1 million for 2016, $4.2 million for 2017 and $4.3 million for 2018 and will increase by approximately
2.3% each year thereafter. In addition, we are responsible for paying our proportionate share of the building’s utilities, taxes,
insurance and maintenance as well as a property management fee.

We have a right of first refusal for the premises that we do not currently lease as well as a right of first offer for specified
premises in The Omeros Building. If at any time during the term of the lease our space requirements exceed the available space
in The Omeros Building, the landlord will relocate us to a new building under a build-to-suit lease with no termination penalty
payable under our existing lease, subject to the negotiation of a mutually acceptable build-to-suit lease. In addition, beginning
with the sixth year of the lease term, if we request from the landlord additional space in The Omeros Building with a minimum
square footage specified in the lease and the landlord is unable to provide such additional space to us, we may terminate the
lease without payment of any termination fees other than the unamortized portion of a $3.0 million lease incentive paid to us by
the landlord when we entered the lease. We have the right to terminate the lease beginning with year nine of the lease term,
subject to the payment of a lease termination fee. If we terminate the lease during years nine or 10, the termination fee is equal
to 30% of the unamortized tenant improvements and 100% of the unamortized lease incentive. If we terminate the lease any
time after year 10 of the term, the termination fee is equal to 20% of the unamortized tenant improvements and 100% of the
unamortized lease incentive. We believe that these facilities we lease currently are sufficient for our anticipated near-term
needs.

ITEM 3. LEGAL PROCEEDINGS

In July 2015, we received a Notice Letter from Par that Par filed an ANDA containing a Paragraph IV Certification under
the Hatch-Waxman Act and seeking approval from the FDA to market a generic version of OMIDRIA prior to the expiration of
three Omeros patents, U.S. Patent Nos. 8,173,707, 8,586,633 and 9,066,856, which relate to OMIDRIA and that are listed in
the FDA’s Orange Book for OMIDRIA, or the Orange Book Patents. These patents were granted following review by the U.S.
Patent and Trademark Office, or USPTO, are presumed to be valid under governing law, and can only be invalidated in federal
court with clear and convincing evidence. Following receipt of the Paragraph IV Notice Letter we filed a patent infringement
lawsuit against Par in the U.S. District Court for the District of New Jersey on September 2, 2015 and a patent infringement
lawsuit against Par in the U.S. District Court for the District of Delaware on September 3, 2015. Based on our decision to
pursue the action in federal court in Delaware, we voluntarily dismissed the complaint filed in the U.S. District Court for the
District of New Jersey. The complaint that we filed in the U.S. District Court for the District of Delaware has been served on
Par and Par has filed an answer asserting defenses and counterclaims for declaratory judgment of patent invalidity and non-
infringement. The lawsuits were filed under the Hatch-Waxman Act alleging Par’s infringement of the three Orange Book
Patents. We intend to seek leave to amend the lawsuit to assert a fourth patent that issued after Par’s Notice Letter, and which
was granted by the USPTO after the USPTO considered all alleged prior art that was identified by Par in its Paragraph IV
Notice Letter. We have reviewed the assertions in Par’s Paragraph IV Notice Letter and believe they do not have merit, and
intend to prosecute vigorously our patent infringement claims against Par. Under the Hatch-Waxman Act, we were permitted to
file suit within 45 days from receipt of Par’s Notice Letter and thereby trigger a 30-month stay of the FDA’s final approval of
Par’s ANDA. Our lawsuit against Par triggered such stay, which is expected to remain in effect until late January 2018.

ITEM 4.

MINE SAFETY DISCLOSURES

Not applicable.

PART II

ITEM 5.

MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED SHAREHOLDER MATTERS AND
ISSUER PURCHASES OF EQUITY SECURITIES

Market Information

Our common stock is traded on The Nasdaq Global Market under the symbol “OMER.”

The following table sets forth the range of high and low sales prices of our common stock as quoted on The Nasdaq

Global Market for the periods indicated.

Year Ended December 31, 2015

4th Quarter

3rd Quarter

2nd Quarter

1st Quarter

Year Ended December 31, 2014

4th Quarter

3rd Quarter

2nd Quarter

1st Quarter

Holders

High

$16.52

$30.23

$26.64

$27.64

High

$25.10

$18.80

$18.01

$14.69

Low

$10.69

$10.48

$17.62

$18.51

Low

$11.18

$12.12

$9.76

$10.11

As of February 29, 2016, there were approximately 143 holders of record of our common stock.

Dividends

We have never declared or paid any cash dividends on our capital stock, and under the Oxford/EWB Loan Agreement we

have agreed not to pay any dividends. We expect to retain all available funds and future earnings to fund the development and
growth of our business and we do not anticipate paying any cash dividends in the foreseeable future.

Stock Performance Graph

The following graph compares the cumulative total shareholder return for our common stock (OMER), the Nasdaq

Biotechnology Index (NBI) and the Nasdaq U.S. Benchmark TR Index (NQUSBT) for the period beginning December 31,
2010 and ending December 31, 2015. This graph assumes that $100 was invested on December 31, 2010 in our common stock,
the Nasdaq Biotechnology Index and the Nasdaq U.S. Benchmark TR Index. It also assumes that any dividends were
reinvested. The data shown in the following graph are not necessarily indicative of future stock price performance.

The foregoing information shall not be deemed to be “soliciting material” or to be “filed” for purposes of Section 18 of
the Exchange Act or otherwise subject to the liabilities under that Section. In addition, the foregoing information shall not be
deemed to be incorporated by reference into any of our filings under the Exchange Act or the Securities Act of 1933, except to
the extent that we specifically incorporate this information by reference.

ITEM 6.

SELECTED CONSOLIDATED FINANCIAL DATA

The following selected consolidated financial data should be read in conjunction with “Management’s Discussion and

Analysis of Financial Condition and Results of Operations” and our consolidated financial statements and the accompanying
notes included elsewhere in this Annual Report on Form 10-K. Our historical results are not necessarily indicative of the
results to be expected in any future period.

Consolidated Statements of Operations
and Comprehensive Loss Data:
Revenue

Product Sales

Grant revenue

Total revenue

Costs and expenses:

Cost of product sales

Research and development

Selling, general and administrative

Total costs and expenses

Loss from operations

Litigation settlement

Interest expense

Loss on early extinguishment of debt

Other income (expense), net

Net Loss

Basic and diluted net loss per share

Denominator for basic and diluted net loss
per share

Year Ended December 31,

2015

2014

2013

2012

2011

(In thousands, except per share and share data)

13,264

— $

245

13,509

1,041

48,379

35,327

84,747

(71,238)

—

(3,573)

(1,315)

1,030

(75,096)

(2.00)

539

—

47,946

22,601

70,547
(70,008)
—
(3,470)
—
(195)
(73,673)

(2.22)

1,600

—

36,297

15,819

52,116
(50,516)
12,500
(2,366)
—

586
(39,796)

(1.39)

6,022

—

31,922

10,985

42,907
(36,885)
—
(1,729)
—

170
(38,444)

(1.59)

—

4,524

—

23,718

8,216

31,934
(27,410)
—
(1,884)
—

748
(28,546)

(1.29)

37,560,257

33,234.294

28,560,360

24,155,690

22,212,351

2015

2014

2013

2012

2011

As of December 31,

(In thousands)

Consolidated Balance Sheet Data:
Cash, cash equivalents and short-term
investments
Working capital

Restricted cash and investments

Total assets

Notes payable, net of discount

Accumulated deficit

Total shareholders’ deficit

28,263

20,893

10,679

48,995

49,842

(403,142)

(26,234)

6,886
(9,274)
679

10,834

32,453
(328,046)
(42,654)

14,101

22,350

2,944

679

16,535

20,498
(254,373)
(18,384)

16,341

679

26,575

20,103
(214,577)
(6,531)

24,570

6,963

193

26,982

19,446
(176,133)
(5,554)

ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
OPERATIONS

The following discussion and analysis should be read in conjunction with the audited annual consolidated financial
statements and the related notes thereto included elsewhere in this Annual Report on Form 10-K. This discussion contains
forward-looking statements reflecting our current expectations that involve risks and uncertainties. Actual results may differ
materially from those discussed in these forward-looking statements due to a number of factors, including those set forth in the
section entitled “Risk Factors” and elsewhere in this Annual Report on Form 10-K. For further information regarding
forward-looking statements, please refer to the special note regarding forward-looking statements at the beginning of this
Annual Report on Form 10-K. Throughout this discussion, unless the context specifies or implies otherwise, the terms
“Company,” “we,” “us” and “our” refer to Omeros Corporation and our wholly owned subsidiaries.

Overview

We are a biopharmaceutical company committed to discovering, developing and commercializing both small-molecule

and protein therapeutics for large-market as well as orphan indications targeting inflammation, coagulopathies and disorders of
the central nervous system. Our marketed drug product OMIDRIA® (phenylephrine and ketorolac injection) 1%/0.3% was
broadly launched in the U.S. in April 2015 for use during cataract surgery or intraocular lens, or IOL, replacement. OMIDRIA
is derived from our proprietary PharmacoSurgery® platform, which is designed to improve clinical outcomes of patients
undergoing ophthalmological, arthroscopic, urological and other surgical procedures. Our proprietary PharmacoSurgery
platform is based on low-dose combinations of U.S. Food and Drug Administration-approved, or FDA-approved, therapeutic
agents delivered directly to the surgical site throughout the duration of the procedure to inhibit preemptively inflammation and
other problems caused by surgical trauma and to provide clinical benefits both during and after surgery. In our pipeline we have
clinical-stage development programs focused on: complement-related thrombotic microangiopathies; complement-mediated
glomerulopathies; Huntington’s disease and cognitive impairment; addictive and compulsive disorders; and problems
associated with urologic surgical procedures. In addition, we have a diverse group of preclinical programs and two additional
platforms: one capable of unlocking new G protein-coupled receptor, or GPCR, drug targets and the other used to generate
antibodies. For OMIDRIA and each of our product candidates and our programs, other than OMS103, we have retained control
of all commercial rights.

Financial Summary

We recognized net losses of $75.1 million, $73.7 million, and $39.8 million for the years ended December 31, 2015, 2014
and 2013, respectively. Historically, these losses have been principally from expenses incurred in connection with research and
development activities and beginning in 2014, selling activities associated with planning for and launching OMIDRIA in the
U.S. also contributed to our operating expenses. During the year ended December 31, 2015, U.S. OMIDRIA revenues of $13.3
million helped offset a portion of our 2015 operating expenses. We expect our net losses to continue until such time as we
derive sufficient revenues from sales of OMIDRIA and/or other sources, such as licensing and other revenues from our product
candidates, that are sufficient to cover our expenses.

As of December 31, 2015, our accumulated deficit was $403.1 million and total shareholders’ deficit was $26.2 million.

We also had $28.3 million in cash and cash equivalents and short-term investments at December 31, 2015.

Results of Operations

Revenue

Our revenue consists of U.S. product sales of OMIDRIA and revenue recognized in connection with third-party grant

funding.

Product sales, net

Grant revenue:

Small Business Innovative Research Grants (SBIR)

Vulcan Inc.
Total revenue

245

—

13,509

539

—

539

Years Ended December 31,

2015

2014

2013

13,264

(In thousands)
$

— $

—

630

970

1,600

The increase in revenues for the year ended December 31, 2015 compared to the same period in 2014 was due to the
broad U.S. launch of OMIDRIA in April 2015. The decrease in revenue for the year ended December 31, 2014 to 2013 was
primarily due to lower revenue recognized from our GPCR program funding agreements with Vulcan and LSDF that were fully
recognized in 2013.

Product Sales, Net

We record OMIDRIA product sales net of estimated chargebacks, rebates, distribution fees and product returns. These
deductions are generally referred to as gross-to-net deductions. A summary of our 2015 gross-to-net provision and payments are
as follows:

Balance as of December 31, 2014

Provision related to current period sales

Payments for current period sales

Balance as of December 31, 2015

Chargebacks
and Rebates

Distribution
Fees and
Product
Return
Allowances

(In thousands)

Total

— $

320
(140)
180

555
(278)
277

—

875
(418)
457

Chargebacks and Rebates. Immediately following the launch of OMIDRIA, we entered into a Pharmaceutical Pricing
Agreement with the Secretary of the U.S. Department of Health and Human Services, which enables entities that qualify for
government pricing under the Public Health Services Act, or PHSA, to receive discounts on their qualified purchases of
OMIDRIA. We subsequently entered into a Federal Supply Schedule, or FSS, agreement under which certain U.S. government
purchasers receive a discount on eligible purchases of OMIDRIA. In October 2015, we entered into an agreement with an
authorized 340B prime vendor entitling its customers to purchase OMIDRIA at a greater discount (i.e., sub-340B/sub-
wholesale acquisition cost, or WAC), than those offered under our PHSA Pharmaceutical Pricing Agreement. We identify the
entities that purchase OMIDRIA that are eligible for PHSA, FSS or 340B prime-vendor pricing and, utilizing our historical
chargeback information and projected payer mix, we record a provision for estimated chargebacks for these entities at the time
of sale. After our wholesalers have made a sale at an eligible purchaser under one of these agreements, they forward to us a
chargeback for the difference between WAC and the applicable discounted price and we issue the wholesaler a credit memo
against its outstanding receivable to us.

We have also entered into a Medicaid Drug Rebate Agreement with CMS, which provides a rebate to participating states

based on covered purchases of OMIDRIA. We record estimated Medicaid rebates based on our payer mix and historical
information for OMIDRIA at the time of sale and the accrual is offset when we make payments to the participating states.

In October 2015, we launched the OMIDRIAssure Reimbursement Services Program. This program expands patient

access to OMIDRIA by providing reimbursement support services related to OMIDRIA, free product based on the financial
need of government-insured or uninsured patients and financial assistance for patients whose commercial insurance is
inadequate to cover fully the cost of OMIDRIA. We monitor claims submitted and claims actually paid and, utilizing this
information, we project claims and estimate rebates for the program at the time of sale to the wholesaler. As payments are
made, we reduce the previously recorded accrual.

We expect future chargeback and rebate deductions as a percentage of product sales to increase based on our prime

vendor agreement, the launch of OMIDRIAssure and increased volume of purchases eligible for government-mandated
discounts and rebates.

Distribution Fees and Product Return Allowances. We pay our wholesalers a distribution fee for services they perform for

us based on the dollar value of their purchases of OMIDRIA. We record a provision for these charges at the time of sale to the
wholesaler and, quarterly, we make payments to our wholesalers. We expect distribution fees to continue to fluctuate in
correlation with product sales.

We allow for the return of product up to 12 months past its expiration date or for product that is damaged or not used by
our customers. In estimating product returns, we take into consideration our single-tier distribution model, our expectation that
product is typically not accumulated by healthcare providers based on the frequency of their reorders, OMIDRIA expiration
dating, quantities of inventory in the wholesale channel, our experience to date and historical industry return rates. We record a
provision for returns upon sale of OMIDRIA to our wholesalers. When a return is received, we issue a credit memo to the
wholesaler against its outstanding receivable to us.

Research and Development Expenses

Our research and development expenses can be divided into three categories: direct external expenses, which include

clinical research and development and preclinical research and development activities; internal, overhead and other expenses;
and stock-based compensation expense.

Direct external expenses consist primarily of expenses incurred pursuant to agreements with third-party manufacturing

organizations, CROs, clinical trial sites, collaborators, licensors and consultants and lab supplies. Costs are reported in
preclinical research and development until the program enters the clinic. Internal, overhead and other expenses consist of
personnel costs, overhead costs such as rent, utilities and depreciation and other miscellaneous costs. We do not generally
allocate our internal resources, employees and infrastructure to any individual research project because we deploy them across
multiple clinical and preclinical projects that we are advancing in parallel.

The following table illustrates our expenses associated with these activities:

Direct external expenses:

Clinical research and development:

OMS824
OMS721

OMIDRIA (OMS302)

Other clinical programs

Total clinical research and development

Preclinical research and development

Total direct external expenses

Internal, overhead and other expenses

Stock-based compensation expense

Total research and development expenses

Years Ended December 31,

2015

2014

2013

(In thousands)

1,508
15,852

4,396

21,793

1,383

23,176

20,226

4,977

10,974
8,064

5,294

144

24,476

2,252

26,728

16,464

4,754

7,265
1,996

4,477

439

14,177

4,149

18,326

14,383

3,588

48,379

47,946

36,297

The decrease in direct external clinical research and development expenses during the year ended December 31, 2015
compared to 2014 was due primarily to reduced costs for our OMS824 program in connection with its 2014 clinical suspension
and lower OMIDRIA clinical trial costs after our U.S. approval in May 2014. This decrease was partially offset by increased
clinical trial costs for our OMS721 program as we advanced our Phase 2 trials in TMAs, including aHUS, and increased cost of
manufacturing OMS721 clinical trial material.

In addition, internal, overhead and other expenses increased during year ended December 31, 2015 compared to 2014 due

primarily to increased headcount.

The increase in direct external clinical research and development expenses during the year ended December 31, 2014

compared to 2013 was due primarily to higher expenses related to our Phase 1 and Phase 2 clinical trials evaluating OMS824
and OMS721 and to expenses related to our Phase 3 clinical trials evaluating OMIDRIA.

In addition, internal, overhead and other expenses increased for the year ended December 31, 2014 compared to the same

period in 2013 due to increased headcount. The increase in stock-based compensation related to stock option grants resulted
from annual employee performance reviews in 2014 and new hire grants.

At this time, we are unable to estimate with any certainty the costs we will incur in the continued development of our

product candidates due to the inherently unpredictable nature of our preclinical and clinical development activities and to the
early stage of many of our preclinical development programs. Clinical development timelines, the probability of success and
development costs can differ materially as new data becomes available and as expectations change. While we are currently
focused on advancing our product development programs, our future research and development expenses will depend on the
preclinical or clinical success of each product candidate, the outcome of our ongoing assessments of each program’s
commercial potential, the commercial success of OMIDRIA, the results of future collaborations, if any, and our overall capital
resources. We also cannot forecast with any degree of certainty which product candidates, if any, may be subject to future
collaborations, when such arrangements will be secured, if at all, and to what degree such arrangements would affect our
development plans and capital requirements.

We are required to expend substantial resources in the development of our product candidates due to the lengthy process
of completing clinical trials and seeking regulatory approval. Any failure or delay in completing clinical trials, or in obtaining
regulatory approvals, could cause a delay in our generation of further product revenue, could increase our research and
development expenses and, in turn, could have a material adverse effect on our operations, financial condition and liquidity.
Because of the factors above, we are not able to estimate with any certainty when or if we would recognize any net cash
inflows from our research and development projects.

Selling, General and Administrative Expenses

Our selling, general and administrative (SG&A) expenses are comprised primarily of salaries, benefits, stock-

compensation costs for sales, marketing, and other personnel not directly engaged in research and development, service fees
incurred for our dedicated contracted sales force, marketing and selling expenses, professional and legal services, general
corporate costs and an allocation of our occupancy costs.

Selling, general and administrative expenses, excluding stock-based compensation
expense
Stock-based compensation expense

Total selling, general and administrative expenses

Years Ended December 31,

2015

2014

2013

(In thousands)

30,723

4,604

35,327

18,437

4,164

22,601

13,155

2,664

15,819

The increase in selling, general and administrative expenses during the year ended December 31, 2015 compared 2014

was primarily due to increased sales and marketing costs incurred in connection with our third-party contracted OMIDRIA
sales force maintained by inVentiv; marketing materials, events and conferences; and administrative and legal costs to support
the broad U.S. market launch of OMIDRIA in April 2015.

The increase in selling, general and administrative expenses during the year ended December 31, 2014 compared to the
same period of 2013 was primarily due to incremental expenses related to the preparation for the U.S. commercial launch of
OMIDRIA, which includes the costs for obtaining and training our third-party contracted sales force, the design and creation of
marketing materials and the costs related to attending trade shows and conferences; and increased costs related to additional
employees and non-cash stock-based compensation. These increases were partially offset by reduced legal fees associated with
the expenses incurred in 2013 in connection with the matter against our former insurer and the $1.1 million we paid in 2013 to
the National Institute of Health, or NIH, in connection with its administrative review (see Note 9 to our Consolidated Financial
Statements in this Annual Report on Form 10-K).

In December 2015, we amended our agreement with inVentiv and, effective January 1, 2016, hired as in-house employees

the majority of our previously contracted field sales representatives. Under the amended agreement, inVentiv will continue to
provide back-office sales management and systems support to us on a month-to-month basis. We anticipate that the costs
resulting from the conversion will not be materially different than the overall costs incurred for the contracted field sales
representatives and related systems support.

We expect our selling, general and administrative expenses for 2016 to increase slightly from 2015 in connection with
commissions on OMIDRIA sales and legal costs in connection with defending our patents and pursuing our patent infringement
claims related to Par’s efforts to obtain FDA approval for a generic version of OMIDRIA.

Litigation Settlement

In the year ended December 31, 2013, we received a $12.5 million litigation settlement payment from our former insurer

related to their defense of, and coverage obligations related to, the Klein lawsuit. (See Note 9 to our Consolidated Financial
Statements in this Annual Report on Form 10-K).

Interest Expense

Years Ended December 31,

2015

2014

2013

3,573

(In thousands)
3,470
$

2,366

Interest expense was $3.6 million and $3.5 million for the years ended December 31, 2015 and 2014, respectively.
Interest expense remained steady in 2015 compared to 2014 due to similar average balances outstanding and the same effective
interest rate on our notes payable during 2015 and 2014.

Interest expense was $3.5 million and $2.4 million for the years ended December 31, 2014 and 2013, respectively. The
increase in 2014 compared to 2013 was the result of a higher average outstanding balance on our notes payable during 2014
than 2013 due to additional borrowings of $12.7 million in March 2014.

Loss on Early Extinguishment of Debt

In December 2015, we entered into a new Loan and Security Agreement with Oxford and East West Bank, or the Oxford/
EWB Loan Agreement. We accounted for the termination of the then existing notes payable as a debt extinguishment (see Note
7 to our Consolidated Financial Statements in this Annual Report on Form 10-K). Accordingly, we incurred a loss of $1.3
million associated with the unamortized loan maturity fee and the prepayment fee.

Other Income (Expense), Net

Years Ended December 31,

2015

2014

2013

1,030

(In thousands)
(195)
$

586

Other income (expense) principally includes sublease rental income and non-cash charges associated with modifications

to common stock warrants that we had outstanding. The increase in other income during the year ended December 31, 2015
compared to 2014 is due to incremental sublease income earned in 2015 and an $863,000 warrant modification expense
incurred in 2014 (see Note 10 to our Consolidated Financial Statements in this Annual Report on Form 10-K). The decrease in
other income (expense) during the year ended December 31, 2014 compared to 2013 is due to the $863,000 of warrant
modification expense being recognized in 2014, which is partially offset by incremental sublease rental income.

Financial Condition - Liquidity and Capital Resources

We generated net losses of $75.1 million, $73.7 million and $39.8 million in 2015, 2014 and 2013, respectively, and as

of December 31, 2015, we had $28.3 million in cash, cash equivalents and short-term investments available for general
corporate use. In addition, in restricted cash and investments we have $10.0 million that must be maintained in depository and
investment accounts pursuant to the Oxford/EWB loan agreement and $679,000 used to secure a letter of credit for The Omeros
Building Lease.

Future Funding Requirements

We expect to continue to incur losses until such time as OMIDRIA product sales, corporate partnerships and/or licensing

revenues from products or programs are adequate to support our ongoing operating expenses and debt service. Until we are
cash-flow positive, if at all, we will need to continue to raise additional funds through public or private equity securities sales
including our ATM with JonesTrading (see “At Market Issuance Sale Agreement” below), through the issuance of additional
debt, through corporate partnerships, through asset sales or through the pursuit of collaborations and licensing arrangements
related to certain of our products or programs. These conditions raise a substantial doubt about our ability to continue as a
going concern. If we are unable to raise additional capital when needed through one or more of the avenues previously listed, or
upon acceptable terms, such failure would have a significant negative impact on our financial condition. Should it be necessary
to manage our operating expenses, we would reduce our projected cash requirements through reduction of our expenses by
delaying clinical trials, reducing selected research and development efforts, or implementing other restructuring activities.

Our independent registered public accounting firm included an explanatory paragraph expressing substantial doubt
regarding our ability to continue as a going concern in their report on our consolidated financial statements for the year ended
December 31, 2015. A “going concern” opinion means, in general, that our independent registered public accounting firm has
substantial doubt about our ability to continue our operations without additional infusions of capital from external sources. Our
ability to continue as a going concern depends, in large part, on our ability to generate positive cash flow from operations and
obtain additional financing, neither of which is certain. If we are unable to achieve these goals, our business would be
jeopardized and we may not be able to continue operations.

Cash Flow Data

Cash provided by (used in):

Operating activities

Investing activities

Financing activities

Years ended December 31,

2015

2014

2013

(In thousands)

(65,209)
(20,606)
86,826

(58,044)
6,157

50,857

(29,695)
7,909

21,650

Operating Activities. Net cash used in operating activities increased for the year ended December 31, 2015 by $7.2

million as compared to the same period in 2014. Our 2015 net loss increased by $1.4 million from 2014 due primarily to the
OMIDRIA gross margin of $12.2 million being offset by a $12.7 million increase in selling, general and administrative
expenses associated with the U.S. launch of OMIDRIA. The other primary activity impacting the increase in net cash used in
operating activities between the comparative periods is a $6.1 million increase in receivables related to OMIDRIA sales, which
generally have up to 30-90 day terms.

Net cash used in operating activities increased for the year ended December 31, 2014 by $28.3 million as compared to the
same period in 2013. This increase was primarily related to the increase in our net loss by $33.9 million from 2013 in large part
due to an $18.4 million increase in operating expenses and the $12.5 million we received in 2013 in the litigation settlement
with our former insurer. Other activities impacting the increase in net cash used in operating activities between the comparative
periods was an increase of $6.6 million in accounts payable and accrued expenses in 2014 compared to 2013 and a $2.6 million
decrease in the growth of deferred rent between 2014 and 2013.

Investing Activities. Cash flows from investing activities primarily reflect cash used to purchase short-term investments

and proceeds from the sale of short-term investments, thus causing a shift between our cash and cash equivalents and short-
term investment balances. Because we manage our cash usage with respect to our total cash, cash equivalents and short-term
investments, we do not consider the fluctuations between cash, cash equivalents and our short-term investment balances to be
important to the understanding of our liquidity and capital resources. The remaining component of cash flows from investing
activities is the purchase of property and equipment.

Net cash used in investing activities in the year ended December 31, 2015 was $20.6 million, an increase of $26.8 million

from 2014, primarily due to the purchase of short-term investments with the $79.1 million of net proceeds received from the
sale of common stock and pre-funded warrants in our public offering in February 2015 and $22.3 million in net proceeds from
the Oxford/EWB loan. These purchases were partially offset by the sale of $71.4 million of short-term investments to provide
cash for operating activities.

Net cash provided from investing activities for the year ended December 31, 2014 was $6.2 million, a decrease of $1.8

million from 2013. Of the decrease in cash provided by investing activities between the comparative periods, $1.9 million was
from the purchase of short-term investments year-over-year exceeding our sale of short-term investments.

Financing Activities. Net cash provided by financing activities in the year ended December 31, 2015 was $86.8 million,
an increase of $36.0 million over the same period in 2014 primarily due to the $79.1 million of net proceeds received from the
sale of 3.4 million shares of common stock and pre-funded warrants to purchase 749,250 shares of common stock in our public
offering in February 2015 and the net additional borrowings of $22.3 million under the Oxford/EWB Loan Agreement. During
the 2015 period, we also received $2.9 million upon the exercise of employee stock options and warrants. These additions were
offset by the purchase of $10.0 million of restricted investments pursuant to the Oxford/EWB loan agreement and $7.4 million
in principal payments under the Loan and Security Agreement (the Oxford/MidCap Loan Agreement) with Oxford and MidCap
Financial SBIC, LP (MidCap) prior to entering into the Oxford/EWB Loan Agreement.

Net cash provided from financing activities in the year ended December 31, 2014 was $50.9 million, a $29.2 million

increase from 2013. In March 2014, we received $37.8 million of net proceeds from the sale of 3.5 million shares of common
stock in a public offering and $12.7 million from net additional borrowings under the Oxford/MidCap Loan Agreement. During
the 2014 period, we also received $1.9 million upon the exercise of employee stock options and paid $1.5 million of principal
on notes payable prior to entering into the Oxford/MidCap Loan Agreement.

Loan and Security Agreement

In December 2015, we entered into the Oxford/East West Loan Agreement pursuant to which we borrowed $50.0 million.

We can borrow an additional $20.0 million in two tranches of $10.0 million each through June 30, 2017, contingent upon the
satisfaction of certain conditions including minimum net revenue from OMIDRIA. We used $27.3 million of the loan proceeds
to repay all of the amounts owed by us under our then-outstanding loan from Oxford/Midcap and, after deducting all loan
initiation and outstanding interest on the Oxford/MidCap Loan Agreement, we received $22.3 million in net proceeds.

The Oxford/EWB Loan Agreement requires monthly interest-only payments at an annual rate of 9.25% through July 1,

2017. Beginning August 1, 2017, monthly principal and interest payments of approximately $1.9 million are due on the original
$50.0 million we borrowed through the maturity date of January 1, 2020. In addition, the Oxford/EWB Loan Agreement
requires a $3.8 million loan maturity fee upon full repayment of the initial $50.0 million borrowed and $525,000 for each
additional $10.0 million borrowed. We may prepay the outstanding principal balance in its entirety at any time if we pay an
additional fee equal to 1.0% of the then-outstanding principal balance. As security under the Oxford/EWB Loan Agreement, we
granted Oxford, as collateral agent for the lenders, a security interest in substantially all of our assets, excluding intellectual
property (other than the proceeds derived from any intellectual property).

The Oxford/EWB Loan Agreement contains covenants that require us to maintain $10.0 million in restricted cash and

certain eligible term investments, to meet an annual OMIDRIA revenue minimum for 2016 and quarterly OMIDRIA revenue
minimums in 2017 and 2018, and to establish an at-the-market, or ATM, equity facility that we established on January 6, 2016
(see Note 10). The Oxford/EWB Loan Agreement also contains covenants that limit or restrict our ability to incur indebtedness,
grant liens, merge or consolidate, dispose of assets, make investments, make acquisitions, enter into certain transactions with
affiliates, pay dividends or make distributions, repurchase stock, license our intellectual property for a limited set of our
programs without lender approval or pledge our intellectual property. Additionally, the Oxford/EWB Loan Agreement includes
events of default regarding non-payment, inaccuracy of representations and warranties, covenant breaches, occurrence of a
material adverse effect (MAE, as defined below), cross default to material indebtedness, bankruptcy or insolvency, material
judgments, and a change of control. The occurrence of an event of default could result in the acceleration of the Oxford/EWB
Loan Agreement and, under certain circumstances, could increase our interest rate by 5.0% per annum during the period of
default.

MAE is defined as a material adverse effect upon (i) our business operations, properties, assets, results of operations or

financial condition of Omeros, taken as a whole with respect to our viability, that reasonably would be expected to result in our
inability to repay any portion of the loans in accordance with the terms of the Oxford/EWB Loan Agreement, (ii) the validity,
perfection, value or priority of the lenders’ security interest in the collateral, (iii) the enforceability of any material provision of
the Oxford/EWB Loan Agreement or related agreements, or (iv) the ability of the lenders to enforce their rights and remedies
under the Oxford/EWB Loan Agreement or related agreements. As of December 31, 2015, we were not in default under the
Oxford/EWB Loan Agreement described above.

At Market Issuance Sales Agreement

In January 2016, as required by the Oxford/EWB Loan Agreement, we entered into an At Market Issuance Sales

Agreement, or the ATM Agreement, with JonesTrading Institutional Services LLC, or JonesTrading, pursuant to which we may
direct JonesTrading to sell shares of our common stock with an aggregate offering price of up to $100.0 million directly on The
Nasdaq Global Market, through or to a market maker other than on an exchange or in negotiated transactions. Any sales made
under the ATM Agreement are based solely on our instructions and JonesTrading will receive a 1.7% commission from the
gross proceeds. The ATM Agreement may be terminated by either party at any time upon 10 days' notice to the other party, or
by JonesTrading at any time in certain circumstances including the occurrence of a material adverse effect to Omeros.

Contractual Obligations and Commitments

The following table presents a summary of our contractual obligations and commitments as of December 31, 2015.

1 Year

2-3 Years

4-5 Years

More than
5 Years

Total

Payments Due Within

(In thousands)

Operating leases

4,106

8,447

8,800

33,263

54,616

Capital leases (principal and interest)

Notes payable (principal and interest)

Goods & Services

Total

Operating Leases

4,625

1,396

10,213

165

36,030

22,478

— $

—

313

63,133

1,396

44,642

31,340

33,263

119,458

We lease our office and laboratory space in The Omeros Building under a lease agreement with BMR - 201 Elliott
Avenue LLC. The initial term of the lease ends in November 2027 and we have two options to extend the lease term, each by
five years. As of December 31, 2015, the remaining aggregate non-cancelable rent payable under the initial term of the lease,
excluding common area maintenance and related operating expenses, is $54.5 million.

We also rent equipment under various operating lease agreements. As of December 31, 2015, the remaining aggregate

non-cancellable rent payable under these equipment leases is $76,000.

Notes Payable

Refer to “Liquidity-Loan and Security Agreement” above.

Goods & Services

As of December 31, 2015, Patheon was completing the analytical testing required to transfer OMIDRIA commercial

product costing $1.3 million to us. We anticipate receiving the product during the first quarter of 2016 and the product dating
will allow the product to be sold through at least the third quarter of 2018. This is the final commercial supply of OMIDRIA
that Patheon will be available to produce in its facility currently approved for the manufacture of OMIDRIA.

We have entered into a non-exclusive agreement with Hospira Worldwide, Inc., or Hospira, for the ongoing commercial
supply of OMIDRIA and we are currently completing the manufacturing process transfer, process validation and approval of
Hospira as a manufacturing site for OMIDRIA. We anticipate Hospira will be able to provide OMIDRIA commercial product to
us beginning in the first part of 2017. We have no firm purchase commitments outstanding under this agreement as of
December 31, 2015.

We may also be required, in connection with in-licensing or asset acquisition agreements, to make certain royalty and
milestone payments and we cannot, at this time, determine when or if the related milestones will be achieved or whether the
events triggering the commencement of payment obligations will occur. Therefore, such payments are not included in the table
above. See Note 9 to our Consolidated Financial Statements in this Annual Report on Form 10-K for a description of the
agreements that include these royalty and milestone payment obligations.

Critical Accounting Policies and Significant Judgments and Estimates

The preparation of our consolidated financial statements, in conformity with generally accepted accounting principles, or

GAAP, requires management to make estimates and assumptions that affect the amounts reported in the financial statements
and accompanying notes. We base our estimates on historical experience and on various other factors that we believe are
reasonable under the circumstances; however, actual results could differ from those estimates. An accounting policy is
considered critical if it is important to a company’s financial condition and results of operations and if it requires the exercise of
significant judgment and the use of estimates on the part of management in its application. Although we believe that our
judgments and estimates are appropriate, actual results may differ materially from our estimates.

We believe the following to be our critical accounting policies because they are both important to the portrayal of our
financial condition and results of operations and they require critical judgment by management and estimates about matters that
are uncertain:

•

revenue recognition;

•

research and development expenses, primarily clinical trial expenses; and

stock-based compensation.

If actual results or events differ materially from those contemplated by us in making these estimates, our reported

financial condition and results of operations for future periods could be materially affected.

Revenue Recognition

Our revenues are comprised of product sales of OMIDRIA and amounts earned for services under grants from third

parties. Revenue is recognized when there is persuasive evidence that an arrangement exists, product title and risk of loss is
passed or the service has been provided, the price is fixed or determinable and collection is reasonably assured. We record
OMIDRIA product revenue upon delivery to our wholesalers. Product sales to a wholesaler are not recorded if we determine
that the wholesaler’s on-hand OMIDRIA inventory, based on inventory information we regularly receive from our wholesalers,
exceeds approximately eight weeks of projected demand.

Product sales are recorded net of estimated chargebacks and rebates, wholesaler fees for distribution services and
estimated product returns. Accruals, which require a substantial degree of judgment, are established for these deductions when
revenue is recognized and actual amounts incurred are offset against the applicable accruals. If actual results vary from our
estimates, we may need to adjust our accruals which could have an effect on our results of operations in the period of the
adjustment. We reflect each of these accruals as either a reduction in the related account receivable or as an accrued liability,
depending on how the accrual is settled.

Chargebacks and Rebates: Provisions for chargebacks are determined utilizing historical and projected payer mix and

sale-through and inventory on-hand information received directly from wholesalers. Chargebacks are generally settled within
four weeks of recording product sales revenue.

We provide reimbursement support services and financial assistance in the form of a rebate on behalf of patients whose

commercial insurance is inadequate to cover the full cost of OMIDRIA. We apply an experience ratio to product sales to
determine the rebate accrual. This experience ratio is reviewed and updated periodically to reflect actual results.

Distribution Fees and Product Return Allowances. We pay our wholesalers a distribution fee for services that they
perform for us based on the WAC value of their purchases of OMIDRIA. We record a provision against product sales for these
charges at the time of sale to the wholesaler.

For all wholesalers and health care providers, we allow for the return of product up to 12 months past its expiration date
if the product is damaged or if the product is unused by the ASC or hospital. In estimating product returns allowances, we take
into consideration our single-tier distribution model and our belief that product is typically not held by the healthcare providers
based on the frequency of their reorders. We also consider inventory in the wholesale channel, our return experience to date, the
remaining shelf life of product we have previously sold and historical industry return rates.

Research and Development Expenses

Research and development costs are comprised primarily of costs for personnel, including salaries, benefits and stock

compensation; an allocation of our occupancy costs; clinical study costs; contracted research; manufacturing; consulting
arrangements; depreciation; materials and supplies; milestones; and other expenses incurred to sustain our overall research and
development programs. Clinical trial expenses for investigational sites require certain estimates. We estimate these costs based
on a cost per patient that varies depending on the clinical trial site. As actual costs become known to us, we adjust our
estimates; these changes in estimates may result in understated or overstated expenses at a given point in time. Research and
development costs are expensed as incurred.

Advanced payments for goods or services that will be used or rendered for future research and development activities are

deferred and then recognized as an expense as the related goods are delivered or as the services are performed, or when the
goods or services are no longer expected to be provided.

Stock-Based Compensation

Stock-based compensation expense is recognized for all share-based payments made to employees, directors and non-
employees based on estimated fair values. The fair value of our stock options is calculated using the Black-Scholes option
valuation model, which requires assumptions, including volatility, forfeiture rates and expected option life. If any of the
assumptions used in the Black-Scholes model change significantly, stock-based compensation expense for new awards may
differ materially from that recorded for existing awards and stock-based compensation for non-employees will vary as the
awards are re-measured over the vesting term.

As stock-based compensation expense is based on options ultimately expected to vest, the expense has been reduced for
estimated forfeitures. We estimate forfeitures for expense recognition based on our historical experience. Groups of employees
that have similar historical forfeiture behavior are considered separately. We use the straight-line method to allocate
compensation cost to reporting periods over each optionee’s respective requisite service period for employees and directors,
which is generally the vesting period.

Stock options granted to non-employees are accounted for using the fair-value approach using the Black-Scholes option-

pricing model and are re-measured over the vesting term as earned. The estimated fair value is charged to expense over the
applicable service period.

Recent Accounting Pronouncements

In February 2016, the Financial Accounting Standards Board, or FASB, issued ASU 2016-02 related to lease accounting.

This standard requires lessees to recognize a right-of-use asset and a lease liability for most leases. This standard must be
applied using a modified retrospective transition and is effective for all annual and interim periods beginning after December
15, 2018. Earlier adoption is permitted. We are evaluating how this new standard will impact the presentation of our financial
statements and related disclosures.

In July 2015, FASB issued ASU 2015-11 related to simplifying the measurement of inventory. This standard requires

inventory to be measured at the lower of cost or net realizable value. This standard must be applied prospectively and is
effective for all annual and interim periods beginning after December 15, 2016. Earlier application is permitted as of the
beginning of an interim or annual reporting period. This standard is not expected to have a material impact on the presentation
of the Company’s financial position.

In August 2014, FASB issued ASU No. 2014-15 related to disclosure of an entity’s ability to continue as a going concern.

This standard requires management to evaluate whether substantial doubt exists regarding the entity’s ability to continue as a
going concern at each reporting period for a duration of one year after the date the financial statements are issued or available
to be issued. The standard establishes certain required disclosures if substantial doubt exists. This standard must be applied
prospectively and is effective for interim and annual periods beginning after December 15, 2016. We will review the impact of
the standard upon our disclosures, if applicable, beginning in 2017.

In May 2014, FASB issued ASU No. 2014-09 related to the recognition of revenue that supersedes existing guidance.

This standard clarifies the principles for recognizing revenue utilizing a five-step process. This standard must be applied
retroactively to each prior reporting period presented, or retrospectively with the cumulative effect of applying the standard
recognized in the period adopted. As amended, the standard is effective for interim and annual periods beginning after
December 15, 2017 and cannot be adopted before that effective date. We are currently evaluating the impact that this standard
may have on our financial statements once it is adopted.

Off-Balance Sheet Arrangements

We have not engaged in any off-balance sheet arrangements.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Our exposure to market risk is primarily confined to our investment securities and notes payable. The primary objective

of our investment activities is to preserve our capital to fund operations. We also seek to maximize income from our
investments without assuming significant risk. To achieve our objectives, we maintain a portfolio of investments in high-credit-
quality securities. As of December 31, 2015, we had cash, cash equivalents and short-term investments of $28.3 million. In
accordance with our investment policy, we invest funds in highly liquid, investment-grade securities. The securities in our
investment portfolio are not leveraged and are classified as available-for-sale. We currently do not hedge interest rate exposure.
Because of the short-term maturities of our investments, we do not believe that an increase in market rates would have a
material negative impact on the realized value of our investment portfolio. We actively monitor changes in interest rates and,
with our current portfolio of short term investments, we are not exposed to potential loss due to changes in interest rates.

ITEM 8.

FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

See Item 15 of this Annual Report on Form 10-K.

ITEM 9.

CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
FINANCIAL DISCLOSURE

None.

ITEM 9A. CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

Our management, with the participation of our principal executive officer and principal financial officer, evaluated the
effectiveness of our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act,
as of December 31, 2015. Management recognizes that any controls and procedures, no matter how well designed and
operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment
in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure
controls and procedures as of December 31, 2015, our principal executive and principal financial officers concluded that, as of
such date, our disclosure controls and procedures were effective at the reasonable assurance level.

Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as

such term is defined in Exchange Act Rules 13a-15(f) and 15d-15(f). 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.

Internal control over financial reporting cannot provide absolute assurance of achieving financial reporting objectives

because of its inherent limitations. Internal control over financial reporting is a process that involves human diligence and
compliance and is subject to lapses in judgment and breakdowns resulting from human failures. Internal control over financial
reporting also can be circumvented by collusion or improper management override. Because of such limitations, there is a risk
that material misstatements may not be prevented or detected on a timely basis by internal control over financial reporting.
However, these inherent limitations are known features of the financial reporting process. Therefore, it is possible to design into
the process safeguards to reduce, though not eliminate, this risk.

Our management, with the participation of our principal executive and principal financial officers, conducted an
assessment of the effectiveness of our internal control over financial reporting as of December 31, 2015. In making this
assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway
Commission in Internal Control-Integrated Framework (2013 framework). Based on the results of this assessment and on those
criteria, our management concluded that our internal control over financial reporting was effective as of December 31, 2015.

Ernst & Young LLP has independently assessed the effectiveness of our internal control over financial reporting as of

December 31, 2015 and its report is included below.

There was no change in our internal control over financial reporting identified in connection with the evaluation required
by Rules 13a-15(d) and 15d-15(d) of the Exchange Act that occurred during our fourth fiscal quarter of 2015 that has materially
affected, or is reasonably likely to materially affect, our internal control over financial reporting.

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders of Omeros Corporation

We have audited Omeros Corporation’s internal control over financial reporting as of December 31, 2015, 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). Omeros Corporation’s management is responsible for maintaining
effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial
reporting included in the accompanying Management’s Annual 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 conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States).
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.

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.

In our opinion, Omeros Corporation maintained, in all material respects, effective internal control over financial reporting as of
December 31, 2015, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States),
the consolidated balance sheets of Omeros Corporation as of December 31, 2015 and 2014, and the related consolidated
statements of operations and comprehensive loss, shareholders’ deficit, and cash flows for each of the three years in the period
ended December 31, 2015 of Omeros Corporation and our report dated March 15, 2016 expressed an unqualified opinion
thereon that included an explanatory paragraph regarding Omeros Corporation’s ability to continue as a going concern.

/s/ Ernst & Young LLP

Seattle, Washington
March 15, 2016

ITEM 9B. OTHER INFORMATION

None.

PART III

ITEM 10.

DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information required by this item will be contained in our definitive proxy statement issued in connection with the

2016 Annual Meeting of Shareholders and is incorporated herein by reference. Certain information required by this item
concerning executive officers is set forth in Part I of this Annual Report on Form 10-K in “Business-Executive Officers and
Key Employees.”

ITEM 11.

EXECUTIVE COMPENSATION

The information required by this item will be contained in our definitive proxy statement issued in connection with the

2016 Annual Meeting of Shareholders and is incorporated herein by reference.

ITEM 12.

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND
RELATED SHAREHOLDER MATTERS

Except for the information set forth below, the information required by this item will be contained in our definitive proxy

statement issued in connection with the 2016 Annual Meeting of Shareholders and is incorporated herein by reference.

Securities Authorized for Issuance Under Equity Compensation Plans

The following table provides certain information regarding our equity compensation plans in effect as of December 31,

2015:

Equity compensation plans approved by security holders:

2008 Equity Incentive Plan (1)

Amended and Restated 1998 Stock Option Plan

nura inc.

Total

Number of Securiti
to be
Issued Upon
Exercise of
Outstanding
Options,
Warrants and
Rights

Weighted-Average
Exercise Price of
Outstanding Options,
Warrants and
Rights

Number of Securities
Remaining Available for
Future Issuance
Under Equity
Compensation
Plans

6,875,754

1,434,412

8,310,235

9.38

1.17

10.63

7.97

1,724,987

—

1,724,987

(1) Our 2008 Equity Incentive Plan (the 2008 Plan) provides for the grant of incentive and nonstatutory stock options, restricted
stock, stock appreciation rights, performance units and performance shares to employees, directors and consultants and
subsidiary corporations’ employees and consultants. The 2008 Plan also allows any shares returned under our Amended and
Restated 1998 Stock Option Plan (the 1998 Plan), as a result of cancellation of options or repurchase of shares issued
pursuant to the 1998 Plan, to be issued under the 2008 Plan. In addition, our 2008 Plan provides for annual increases in the
number of shares available for issuance thereunder on the first day of each year equal to the lower of: (i) five percent of the
outstanding shares of our common stock on the last day of the preceding year; (ii) 1,785,714 shares; and (iii) such other
amount as our board of directors may determine. On January 1, 2016, an additional 1,785,714 shares became available for
future issuance under our 2008 Plan in accordance with the annual increase. These additional shares from the annual
increase are not included in the table above.

ITEM 13.

CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by this item will be contained in our definitive proxy statement issued in connection with the

2016 Annual Meeting of Shareholders and is incorporated herein by reference.

ITEM 14.

PRINCIPAL ACCOUNTING FEES AND SERVICES

The information required by this item will be contained in our definitive proxy statement issued in connection with the

2016 Annual Meeting of Shareholders and is incorporated herein by reference.

PART IV

ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES

The following documents are filed as part of this Annual Report on Form 10-K:

1. Financial Statements

Reference is made to the Index to the Financial Statements set forth on page F-1 of this Annual Report on Form 10-
K.

2. Financial Statement Schedules

All schedules have been omitted as the required information is either not required, not applicable or otherwise
included in the Financial Statements and notes thereto.

3. Exhibits

Reference is made to the Exhibit Index that is set forth after the Financial Statements in this Annual Report on
Form 10-K.

Pursuant to the requirements 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

OMEROS CORPORATION

/s/ GREGORY A. DEMOPULOS, M.D.

Gregory A. Demopulos, M.D.

President, Chief Executive Officer
and Chairman of the Board of Directors

Dated: March 15, 2016

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

Title

Date

/s/ GREGORY A. DEMOPULOS, M.D.
Gregory A. Demopulos, M.D.

President, Chief Executive Officer and Chairman of the
Board of Directors (Principal Executive Officer)

March 15, 2016

/s/ MICHAEL A. JACOBSEN
Michael A. Jacobsen

/s/ RAY ASPIRI
Ray Aspiri

/s/ THOMAS J. CABLE
Thomas J. Cable

Vice President, Finance, Chief Accounting Officer and
Treasurer (Principal Financial Officer and Principal
Accounting Officer)

March 15, 2016

Director

March 15, 2016

/s/ PETER A. DEMOPULOS, M.D.

Director

March 15, 2016

Peter A. Demopulos, M.D.

/s/ ARNOLD C. HANISH

Arnold C. Hanish

Director

March 15, 2016

/s/ LEROY E. HOOD, M.D., PH.D.

Director

March 15, 2016

Leroy E. Hood, M.D., Ph.D.

/s/ RAJIV SHAH, M.D.

Rajiv Shah, M.D.

Director

March 15, 2016

[THIS PAGE INTENTIONALLY LEFT BLANK]

OMEROS CORPORATION
INDEX TO FINANCIAL STATEMENTS

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
CONSOLIDATED BALANCE SHEETS
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

CONSOLIDATED STATEMENT OF SHAREHOLDERS’ DEFICIT
CONSOLIDATED STATEMENTS OF CASH FLOWS
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Page

F-2
F-3
F-4

F-5
F-6
F-7

F-1

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders
Omeros Corporation

We have audited the accompanying consolidated balance sheets of Omeros Corporation as of December 31, 2015 and
2014, and the related consolidated statements of operations and comprehensive loss, shareholders’ deficit and cash flows for
each of the three years in the period ended December 31, 2015. These financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United
States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit also includes examining, on a test basis, evidence supporting the
amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that
our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated
financial position of Omeros Corporation at December 31, 2015 and 2014, and the consolidated results of its operations and its
cash flows for each of the three years in the period ended December 31, 2015, in conformity with U.S. generally accepted
accounting principles.

The accompanying consolidated financial statements have been prepared assuming that the Company will continue as a
going concern. As discussed in Note 1 to the financial statements, the Company has recurring losses from operations and has a
net capital deficiency that raise substantial doubt about its ability to continue as a going concern. Management's plans in regard
to these matters are also described in Note 1. The consolidated financial statements do not include any adjustments that might
result from the outcome of this uncertainty.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United
States), Omeros Corporation’s internal control over financial reporting as of December 31, 2015, based on criteria established
in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission
(2013 framework) and our report dated March 15, 2016 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Seattle, Washington
March 15, 2016

F-2

OMEROS CORPORATION

CONSOLIDATED BALANCE SHEETS

(In thousands, except share and per share data)

Assets
Current assets:

Cash and cash equivalents

Short-term investments

Receivables

Inventory

Prepaid expense

Total current assets

Property and equipment, net

Restricted cash and investments

Other assets

Total assets
Liabilities and shareholders’ deficit
Current liabilities:

Accounts payable

Accrued expenses

Current portion of notes payable

Total current liabilities

Notes payable, net

Deferred rent

Commitments and contingencies (Note 9)

Shareholders’ deficit:

Preferred stock, par value $0.01 per share, 20,000,000 authorized and none issued at
December 31, 2015 and 2014.
Common Stock, par value $0.01 per share, 150,000,000 shares authorized at December 31,
2015 and 2014; 38,040,891 and 34,185,464 issued and outstanding at December 31, 2015
and December 31, 2014, respectively.
Additional paid-in capital

Accumulated deficit

Total shareholders’ deficit

Total liabilities and shareholders’ deficit

See notes to consolidated financial statements

F-3

December 31,

2015

2014

1,365

26,898

6,517

472

1,894

37,146

951

10,679

219

354

6,532

392

568

1,195

9,041

782

679

332

48,995

10,834

6,428

9,752

16,253

49,769

9,207

—

380

4,915

7,070

6,330

18,315

26,123

9,050

—

342

376,528
(403,142)
(26,234)
48,995

285,050
(328,046)
(42,654)
10,834

OMEROS CORPORATION

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

(In thousands, except share and per share data)

Revenues:

Product sales, net

Grant revenue

Total revenue

Costs and expenses:

Cost of product sales

Research and development

Selling, general and administrative

Total costs and expenses

Loss from operations

Litigation settlement

Interest expense

Loss on early extinguishment of debt

Other income (expense), net

Net loss

Comprehensive loss

Basic and diluted net loss per share

Year Ended December 31,
2014

2013

2015

13,264

— $

245

13,509

1,041

48,379

35,327

84,747

539

—

47,946

22,601

70,547

(71,238)

(70,008)

—

(3,573)

(1,315)

1,030

(75,096)

(2.00)

—

(3,470)

—

(195)

(73,673)

(2.22)

—

1,600

—

36,297

15,819

52,116

(50,516)

12,500

(2,366)

—

586

(39,796)

(1.39)

Weighted-average shares used to compute basic and diluted net loss per share

37,560,257

33,234,294

28,560,360

See notes to consolidated financial statements

F-4

OMEROS CORPORATION

CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ DEFICIT
(In thousands, except share data)

Balance at December 31, 2012

Common Stock

Shares
25,897,483

Amount

259

Issuance of common stock, net of offering
costs

3,903,004

Issuance of common stock utilizing At-
The-Market Agreement, net of
commissions

Issuance of common stock upon exercise
of stock options

Stock-based compensation

Warrant modification

Net loss

373,700

185,321

—

Additional
Paid-in
Capital
207,787

16,081

4,864

660

6,252

—

Accumulated
Deficit
$ (214,577)

Total
Shareholders’
Deficit

(6,531)

—

—
(39,796)

16,120

4,868

662

6,252

41
(39,796)

Balance at December 31, 2013

30,359,508

304

235,685

(254,373)

(18,384)

Issuance of common stock, net of offering
costs

3,500,000

Issuance of common stock upon exercise
of warrants

Issuance of common stock upon exercise
of stock options

Stock-based compensation

Warrant modification

Net loss

28,653

297,303

—

37,719

1,797

8,918

863

—

—
(73,673)

37,754

1,800

8,918

863
(73,673)

Balance at December 31, 2014

34,185,464

342

285,050

$ (328,046)

(42,654)

Issuance of common stock and pre-funded
warrants, net of offering costs
Issuance of common stock upon exercise
of warrants
Issuance of common stock upon exercise
of stock options
Stock-based compensation
Net loss

Balance at December 31, 2015

3,444,831

133,240

277,356

—
—
38,040,891

—
—
380

79,042

1,435

1,420

9,581
—
376,528

—

—
(75,096)
$ (403,142)

79,076

1,436

1,423

9,581
(75,096)
(26,234)

See notes to consolidated financial statements

F-5

OMEROS CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

Operating activities:

Net loss

Adjustments to reconcile net loss to net cash used in operating activities:

Loss on early extinguishment of debt

Depreciation and amortization

Stock-based compensation expense

Non-cash interest expense

Warrant modification expense

Changes in operating assets and liabilities:

Receivables
Inventory

Prepaid expenses and noncurrent assets

Accounts payable and accrued expenses

Deferred revenue

Deferred rent

Net cash used in operating activities
Investing activities:

Purchases and sales of property and equipment, net

Purchases of investments

Proceeds from the sale and maturities of investments

Net cash provided by (used in) investing activities
Financing activities:

Proceeds from issuance of common stock and pre-funded warrants, net

Proceeds from borrowings under notes payable, net
Increase in restricted cash and investments

Repayments on notes payable

Proceeds upon exercise of stock options and warrants

Net cash provided by financing activities

Net increase (decrease) in cash and cash equivalents

Cash and cash equivalents at beginning of period

Cash and cash equivalents at end of period
Supplemental cash flow information

Cash paid for interest

Reduction of equipment cost basis due to assets purchased with grant funding

Property acquired under capital lease

Year Ended December 31,

2015

2014

2013

(75,096)

(73,673)

(39,796)

1,315

209

9,581

1,045

—

(6,125)
96
(586)
4,195

—

157
(65,209)

(240)
(91,766)
71,400
(20,606)

79,076

22,329
(10,000)
(7,438)

2,859

86,826

1,011

354

1,365

4,236

— $

137

—

317

8,918

738

863

(13)
(568)
(987)
5,459

—

902
(58,044)

(28)
(58,849)
65,034

6,157

37,754

12,699

—
(1,464)

1,868

50,857
(1,030)
1,384

354

2,674

200

—

302

6,252

502

1,555

—

84
(1,169)
(970)
3,504
(29,695)

(204)
(47,182)
55,295

7,909

20,988

—

662

21,650

(136)

1,520

1,384

1,709

—

See notes to consolidated financial statements

F-6

OMEROS CORPORATION
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 1—Organization and Basis of Presentation

Organization

We are a biopharmaceutical company committed to discovering, developing and commercializing both small-molecule

and protein therapeutics for large-market as well as orphan indications targeting inflammation, coagulopathies and disorders of
the central nervous system. Our first drug product OMIDRIA has been approved by the United States (U.S.) Food and Drug
Administration (FDA) for use during cataract surgery or intraocular lens (IOL) replacement. We broadly launched OMIDRIA
in the U.S. in April 2015.

Basis of Presentation

Our consolidated financial statements include the financial position and results of operations of Omeros Corporation

(Omeros) and our wholly owned subsidiaries. All inter-company transactions have been eliminated. The accompanying
consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United
States (GAAP).

Segments

We operate in one segment. Management uses cash flow as the primary measure to manage our business and does not

segment our business for internal reporting or decision-making.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and

assumptions that affect the amounts reported in the financial statements and accompanying notes. Significant items subject to
such estimates include revenue recognition, stock-based compensation expense and accruals for clinical trials and
contingencies. We base our estimates on historical experience and on various other factors that we believe are reasonable under
the circumstances; however, actual results could differ from these estimates.

Reclassifications

Certain reclassifications have been made to prior periods in the consolidated financial statements and the accompanying

notes to conform with the current presentation, none of which impacted our net loss or working capital.

Liquidity and Capital Resources

We generated net losses of $75.1 million, $73.7 million and $39.8 million in 2015, 2014 and 2013, respectively, and as of
December 31, 2015, we had $28.3 million in cash, cash equivalents and short-term investments available for general corporate
use. In addition, in restricted cash and investments we have $10 million that must be maintained in depository and investment
accounts pursuant to the new Loan and Security Agreement (the Oxford/EWB Loan Agreement) with Oxford and EastWest
Bank (EWB) as well as $679,000 used to secure a letter of credit for the Omeros Building lease.

We expect to continue to incur losses until such time as OMIDRIA product sales, corporate partnerships and/or licensing

revenues from products or programs are adequate to support our ongoing operating expenses and debt service. We are unable to
predict if or when this may occur, and until it does occur, we will need to continue to raise additional funds through public or
private equity securities sales including our ATM with JonesTrading (see Note 10 for further detail), through the issuance of
additional debt, through corporate partnerships, through asset sales or through the pursuit of collaborations and licensing
arrangements related to certain of our products or programs. These conditions raise a substantial doubt about our ability to
continue as a going concern. If we are unable to become cash-flow positive or to raise additional capital as and when needed, or
upon acceptable terms, such failure would have a significant negative impact on our financial condition.

The accompanying consolidated financial statements have been prepared on a going-concern basis, which contemplates

the realization of assets and the satisfaction of liabilities in the normal course of business. The accompanying consolidated
financial statements do not include any adjustments to reflect the possible future effects on the recoverability and classification
of assets or the amounts and classification of liabilities that may result from uncertainty related to our ability to continue as a
going concern.

F-7

Note 2—Significant Accounting Policies

Cash and Cash Equivalents, Short-Term Investments, and Restricted Cash and Investments

Cash and cash equivalents include highly liquid investments with a maturity of three months or less on the date of
purchase. Short-term investment securities are classified as available-for-sale and are carried at fair value. Unrealized gains and
losses, if any, are reported as a separate component of shareholders’ deficit. Amortization, accretion, interest and dividends,
realized gains and losses and declines in value judged to be other-than-temporary are included in other income (expense). The
cost of securities sold is based on the specific-identification method. Investments in securities with maturities of less than one
year, or those for which management intends to use the investments to fund current operations, are included in current assets.
We evaluate whether an investment is other-than-temporarily impaired based on the specific facts and circumstances. Factors
that are considered in determining whether an other-than-temporary decline in value has occurred include: the market value of
the security in relation to its cost basis; the financial condition of the investee; and the intent and ability to retain the investment
for a sufficient period of time to allow for recovery in the market value of the investment. Restricted cash and investments are
held in certificates of deposit and money-market funds.

Inventory

Inventory is stated at the lower of cost or market determined on a specific identification basis in a manner which
approximates the first-in, first-out (FIFO) method. Costs include amounts related to third party manufacturing, transportation
and internal labor and overhead. Capitalization of costs as inventory begins when the product candidate receives regulatory
approval in the U.S. or the European Union (EU), which for OMIDRIA began upon U.S. regulatory approval in May 2014. We
expense inventory costs related to product candidates as research and development expenses prior to receiving regulatory
approval in the respective territory. Inventory is reduced to net realizable value for excess and obsolete inventories based on
forecasted demand.

Receivables

Receivables relate primarily to sales of OMIDRIA to wholesalers and include reductions for estimated chargebacks,
rebates, and product returns which are expected to be settled through reductions in receivables. Remaining receivables consist
of amounts related to grants from the National Institutes of Health (NIH) and subleases for space in The Omeros Building.
Considering the nature and historic collectability of our receivables, we concluded an allowance for doubtful accounts is not
necessary as of December 31, 2015 and 2014.

Property and Equipment, net

Property and equipment are stated at cost and depreciation is calculated using the straight-line method over the estimated

useful life of the assets, which is generally three to ten years. Equipment financed under capital leases is recorded as property
and equipment and is amortized over the shorter of the useful lives of the related assets or the lease term. Expenditures for
equipment purchased with grant funds are recorded as a reduction to the cost of the applicable equipment. Expenditures for
repairs and maintenance are expensed as incurred.

Impairment of Long-Lived Assets

The carrying amount of long-lived assets is reviewed whenever events or changes in circumstances indicate that the
carrying value of an asset may not be recoverable. Recoverability of these assets is measured by comparing the carrying value
to future undiscounted cash flows the asset is expected to generate. If the asset is considered to be impaired, the amount of any
impairment will be reflected in the results of operations in the period of impairment. We have not recognized any impairment
losses for the years ending December 31, 2015, 2014 and 2013.

Deferred Rent

We recognize rent expense on a straight-line basis over the noncancelable term of The Omeros Building operating lease

and, accordingly, record the difference between cash rent payments and the recognition of rent expense as an increase or
decrease in deferred rent liability. We also record landlord-funded lease incentives, such as reimbursable leasehold
improvements, as an increase in deferred rent liability which is amortized as a reduction of rent expense over the noncancelable
terms of The Omeros Building operating lease.

Revenue Recognition

Our revenues are comprised of product sales of OMIDRIA and amounts earned for services under grants from third parties.

Revenue is recognized when there is persuasive evidence that an arrangement exists, product title and risk of loss is passed to
the customer or the service has been provided, the price is fixed or determinable and collection is reasonably assured.

F-8

Product Sales, Net

We record revenue from product sales when the product is delivered to our wholesalers. Product sales to a wholesaler are
not recorded if we determine that the wholesaler’s on-hand OMIDRIA inventory, based on inventory information we regularly
receive from our wholesalers, exceeds approximately eight weeks of projected demand.

Product sales are recorded net of chargebacks and rebates, wholesaler distribution fees and estimated product returns.
Accruals or allowances are established for these deductions when revenue is recognized, and actual amounts incurred are offset
against the applicable accruals or allowances. We reflect each of these accruals or allowances as either a reduction in the related
account receivable or as an accrued liability, depending on how the amount is settled.

Provisions for chargebacks are determined utilizing historical and projected payer mix and sale-through and inventory on-
hand information received directly from wholesalers. Chargebacks are generally settled within four weeks of recording product
sales revenue.

We provide reimbursement support services and financial assistance in the form of a rebate to patients whose commercial

insurance is inadequate to cover the full cost of OMIDRIA. We apply an experience ratio to product sales to determine the
rebate accrual. This experience ratio is reviewed and updated periodically to reflect actual results.

We allow for the return of product up to 12 months past its expiration date or for product that is damaged. In estimating
product returns, we take into consideration our single-tier distribution model, our expectation that product is typically not held
by the healthcare providers based on the frequency of their reorders, inventory in the wholesale channel, our return experience
to date, the remaining shelf life of product we have previously sold and historical industry return rates.

We pay our wholesalers a distribution fee for services they perform on our behalf based on a contractual rate.

Research and Development

Research and development costs are comprised primarily of costs for personnel, including salaries, benefits and stock

Advance payments for goods or services that will be used or rendered for future research and development activities are
deferred and then recognized as an expense as the related goods are delivered or the services are performed, or when the goods
or services are no longer expected to be provided.

Patents

We generally apply for patent protection on processes and product candidates we or our licensors conceive or develop.

Patent costs are comprised primarily of external legal fees, filing fees incurred to file patent applications, and periodic renewal
fees to keep the patent in force and are expensed as incurred as a component of general and administrative expense.

Selling, General and Administrative

Selling, general and administrative (SG&A) expenses are comprised primarily of salaries, service fees incurred for our
dedicated contracted sales force, benefits, and stock-compensation costs for sales, marketing, and other personnel not directly
engaged in research and development. Additionally, SG&A includes marketing and selling expenses, professional and legal
services; patent costs; depreciation, an allocation of our occupancy costs; and other general corporate expenses. Effective
January 1, 2016, we converted our dedicated contracted sales force provided by a third party to Omeros employees.

F-9

Advertising

Advertising costs, which we consider to be media and marketing materials, are expensed as incurred. We incurred
$885,000 in advertising expense during the year ended December 31, 2015. We had no similar expenses during the years ended
December 31, 2014 and 2013, respectively.

Income Taxes

Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the
financial statement carrying amounts of existing assets and liabilities and their tax bases. Deferred tax assets and liabilities are
measured using enacted tax rates applied to taxable income in the years in which those temporary differences are expected to be
recovered or settled. We recognize the effect of income tax positions only if those positions are more likely than not of being
sustained upon an examination. A valuation allowance is established when it is more likely than not that the deferred tax assets
will not be realized.

Stock-Based Compensation

Stock-based compensation expense is recognized for all share-based payments made to employees, directors and non-
employees based on estimated fair values. The fair value of our stock options is calculated using the Black-Scholes option-
pricing model which requires judgmental assumptions including volatility, forfeiture rates and expected option life. We use the
straight-line method to allocate compensation cost to reporting periods over each optionee’s requisite service period for
employees and directors, which is generally the vesting period. Stock options granted to non-employees are accounted for using
the fair-value approach and are subject to periodic revaluation over their vesting terms as earned.

Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss is comprised of net loss and certain changes in equity that are excluded from net
loss. There was no difference between comprehensive loss and net loss for the years ended December 31, 2015, 2014 or 2013.

Financial Instruments and Concentrations of Credit Risk

Cash and cash equivalents, receivables, accounts payable and accrued liabilities, which are recorded at invoiced amount

or cost, approximate fair value based on the short-term nature of these financial instruments. The fair value of short-term
investments is based on quoted market prices. Financial instruments that potentially subject us to concentrations of credit risk
consist primarily of cash and cash equivalents, short-term investments and receivables. Cash and cash equivalents are held by
financial institutions and are federally insured up to certain limits. At times, our cash and cash equivalents balance exceeds the
federally insured limits. To limit the credit risk, we invest our excess cash in high quality securities such as money market
mutual funds, certificates of deposit and commercial paper.

Major Customers

We sell OMIDRIA through a limited number of wholesalers. Each of these wholesalers, together with entities under their
common control, accounted for greater than 10% of total revenues for the year ended December 31, 2015 and greater than 10%
of accounts receivable as of December 31, 2015 as noted below.

Distributor A

Distributor B

Distributor C

Percentage of Total
Revenue
37%

31%

28%

Percentage of
Accounts
Receivable
45%

23%

27%

Major Suppliers

We use a small number of contract manufacturers to supply OMIDRIA and to produce clinical trial material which creates

a concentration of risk for us. With regards to OMIDRIA, Patheon Manufacturing Services, LLC (Patheon) is completing the
analytical testing required before transferring OMIDRIA commercial product, costing $1.3 million, to us. We anticipate
receiving the product during the first quarter of 2016 and the product dating will allow the product to be sold through at least
the third quarter of 2018. This is the final commercial supply of OMIDRIA that Patheon will be available to produce using
Patheon’s facility currently approved for manufacturing OMIDRIA.

F-10

We have entered into a non-exclusive agreement with Hospira Worldwide, Inc. (Hospira) for the ongoing commercial

supply of OMIDRIA and we are currently completing the manufacturing process transfer, process validation and approval of
Hospira as a manufacturing site for OMIDRIA. We anticipate Hospira will be able to provide OMIDRIA commercial product to
us beginning in 2017.

We believe the commercial supply of OMIDRIA currently undergoing final analytical testing at Patheon plus our

OMIDRIA inventory on hand will be adequate to supply our needs of OMIDRIA until Hospira is able to supply our OMIDRIA
commercial product needs.

While one source of supply is utilized for OMIDRIA and generally one source for each of our product candidates, other

sources are available should we need to change suppliers. We endeavor to maintain reasonable levels of drug supply for our
commercial and clinical trial use. A change in suppliers, however, could cause a delay in delivery of OMIDRIA or our clinical
trial material that would adversely affect our business.

Recently Adopted Accounting Pronouncements

For the year ended December 31, 2015 we adopted and applied retrospectively Financial Accounting Standards Board
(FASB) Accounting Standards Update, or ASU, No. 2015-03, related to simplifying the presentation of debt issuance costs.
This standard requires debt issuance costs related to a recognized debt liability to be presented in the balance sheet as a direct
deduction to the liability. The adoption of ASU 2015-03 resulted in the reclassification of $300,000 of debt issuance costs from
Other Current Assets and Other Assets to Current Portion of Notes Payable and Notes Payable in our December 31, 2014
Consolidated Balance Sheet.

In November 2015, FASB issued ASU, No. 2015-17 that simplifies the presentation of deferred tax assets and liabilities
by jurisdiction, along with any related valuation allowance. The new guidance requires companies to classify all deferred tax
assets and liabilities as noncurrent on the balance sheet. We have elected to apply this standard prospectively for the year ended
December 31, 2015. As we have a full valuation allowance against our deferred tax assets for all periods presented, the
adoption had no material impact on the presentation of our financial condition, results of operations, cash flow and financial
statement disclosures.

Recent Accounting Pronouncements

In February 2016, FASB issued ASU 2016-02 related to lease accounting. This standard requires lessees to recognize a
right-of-use asset and a lease liability for most leases. This standard must be applied using a modified retrospective transition
and is effective for all annual and interim periods beginning after December 15, 2018. Earlier adoption is permitted. We are
evaluating how this new standard will impact the presentation of our financial statements and related disclosures.

In July 2015, FASB issued ASU 2015-11 related to simplifying the measurement of inventory. This standard requires

In August 2014, FASB issued ASU No. 2014-15 related to disclosure of an entity’s ability to continue as a going concern.

In May 2014, FASB issued ASU No. 2014-09 related to the recognition of revenue that supersedes existing guidance.

Note 3—Net Loss Per Share

Basic net loss per share is calculated by dividing the net loss by the weighted-average number of common shares
outstanding for the period. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of
common shares and dilutive common share equivalents outstanding for the period, determined using the treasury-stock method.

F-11

The basic and diluted net loss per share amounts for the years ended December 31, 2015, 2014 and 2013 were computed

based on the shares of common stock outstanding during the respective periods. Potentially dilutive securities excluded from
the diluted loss per share calculation are as follows:

Outstanding options to purchase common stock

Warrants and pre-funded warrants to purchase common stock

Total potentially dilutive securities

Note 4—Cash, Cash Equivalents and Investments

Year Ended December 31,

2015

8,310,235

749,250

9,059,485

2014

8,364,469

551,435

8,915,904

2013

6,969,303

609,016

7,578,319

As of December 31, 2015 and 2014, all investments are classified as short-term and available-for-sale on the

accompanying Consolidated Balance Sheets. We did not own any securities with unrealized loss positions as of December 31,
2015 or 2014. Investment income, which is included as a component of other income (expense), consists primarily of interest
earned.

Note 5—Fair-Value Measurements

On a recurring basis, we measure certain financial assets at fair value. Fair value is defined as the exchange price that

would be received for an asset or paid to transfer a liability, an exit price, in the principal or most advantageous market for the
asset or liability in an orderly transaction between market participants on the measurement date. The accounting standard
establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs, where available. The
following summarizes the three levels of inputs required:

Level 1—Observable inputs for identical assets or liabilities, such as quoted prices in active markets;

Level 2—Inputs other than quoted prices in active markets that are either directly or indirectly observable; and

Level 3—Unobservable inputs in which little or no market data exists, therefore they are developed using estimates

and assumptions developed by us, which reflect those that a market participant would use.

Our fair-value hierarchy for our financial assets and liabilities measured at fair value on a recurring basis are as follows:

Assets:

Money-market funds classified as non-current
restricted cash and investments

Money-market funds classified as short-term
investments
Total

Assets:

Money-market funds classified as non-current
restricted cash and investments

Money-market funds classified as short-term
investments

Total

Level 1

Level 2

Level 3

Total

December 31, 2015

(In thousands)

10,679

26,898

37,577

— $

—

— $

10,679

—

— $

26,898

37,577

Level 1

Level 2

Level 3

Total

December 31, 2014

(In thousands)

679

6,532

7,211

— $

—

— $

—

— $

679

6,532

7,211

Cash held in demand deposit accounts of $1.4 million and $354,000 is excluded from our fair-value hierarchy disclosure

as of December 31, 2015 and 2014, respectively. There were no unrealized gains and losses associated with our short-term
investments as of December 31, 2015 or 2014. The carrying amounts reported in the accompanying Consolidated Balance

F-12

Sheets for receivables, accounts payable and other current monetary assets and liabilities approximate fair value because of the
immediate or short-term maturity of these financial instruments.

Note 6—Certain Balance Sheet Accounts

Receivables

Trade receivables, net

Grant receivables

Other receivables

Total receivables

December 31,

2015

2014

(In thousands)

6,208

136

173

6,517

—

324

392

Trade accounts receivable are shown net of $191,000 of chargebacks and product return allowances as of December 31,

2015.

Inventory

Raw materials

Work-in-process

Finished goods

Total inventory

Property and Equipment

Laboratory equipment

Office equipment and furniture

Computer equipment

Capital lease equipment

Computer software

Total cost

Less accumulated depreciation and amortization

Total property and equipment, net

December 31,

2015

2014

(In thousands)

158

221

472

—

568
568

December 31,

2015

2014

(In thousands)

1,735

1,636

625

482

367

174

3,383
(2,432)
951

615

403

230

126

3,010
(2,228)
782

For the years ended December 31, 2015, 2014 and 2013, depreciation and amortization expense was $209,000, $317,000

and $302,000, respectively.

F-13

Accrued Expenses

Contract research and development

Employee compensation

Consulting and professional fees

Clinical trials

Other accruals

Total accrued liabilities

Note 7—Notes Payable

Loan and Security Agreement

December 31,

2015

2014

(In thousands)

2,973

2,590

2,400

1,108

681

9,752

1,280

2,421

1,952

828

589

7,070

In October 2010, we entered into a loan and security agreement (the Oxford Loan Agreement) with Oxford Finance LLC

(Oxford). In December 2012 we amended the Oxford Loan Agreement and increased the outstanding principal balance to $20.0
million. The Oxford Loan Agreement provided for interest-only payments at an annual rate of 9.25% through December 31,
2013 with principal and interest payments commencing January 1, 2014. In connection with the Oxford Loan Agreement, we
agreed to pay Oxford $1.4 million in a loan maturity fee that was being amortized to interest expense using the effective-
interest method.

In March 2014, we entered into a Loan and Security Agreement (the Oxford/MidCap Loan Agreement) with Oxford and

MidCap Financial SBIC, LP (MidCap) pursuant to which we borrowed $32.0 million. We used $19.1 million of the loan
proceeds to repay all of the amounts owed by us under our then outstanding Oxford Loan Agreement from Oxford and, after
deducting loan initiation costs, we received $12.7 million in net proceeds. The Oxford/MidCap Loan Agreement provided for
interest-only payments at an annual rate of 9.25% through March 1, 2015 with principal and interest payments of $1.0 million
commencing April 1, 2015 through its maturity date of March 1, 2018. In addition, the Oxford/MidCap Loan Agreement
required a $2.2 million loan maturity fee payment upon full repayment of the loan and a prepayment fee equal to 1.0% of the
then-outstanding principal balance if we paid the loan prior to the maturity date.

We accounted for the Oxford/MidCap Loan Agreement as a debt modification and, accordingly, the unamortized debt issuance
costs associated with the then-outstanding loan with Oxford, and the debt issuance costs associated with the Oxford/MidCap Loan
Agreement were being amortized to interest expense using the effective interest method over the remaining term of Oxford/MidCap
Loan Agreement. Additionally, the loan maturity fee, which was treated as a debt discount, was being amortized to interest expense
using the effective-interest method.

In December 2015, we entered into a new Loan and Security Agreement (the Oxford/EWB Loan Agreement) with
Oxford and East West Bank (EWB) pursuant to which we borrowed $50.0 million. In addition, under the Oxford/EWB Loan
Agreement we can borrow an additional $20.0 million in two tranches of $10.0 million each through June 30, 2017, contingent
upon the satisfaction of certain conditions including minimum net revenues from OMIDRIA. We used $27.3 million of the loan
proceeds to repay all of the amounts owed by us under our then-outstanding Oxford/Midcap Loan Agreement including the
outstanding principal of $24.8 million, the loan maturity fee of $2.2 million and the prepayment fee of $248,000. After
deducting all loan initiation and outstanding interest on the Oxford/MidCap Loan Agreement, we received $22.3 million in net
proceeds. We accounted for the termination of the Oxford/Midcap Loan Agreement as a debt extinguishment and, accordingly,
incurred a loss of $1.3 million associated with the unamortized loan maturity fee and the prepayment fee.

The Oxford/EWB Loan Agreement requires monthly interest-only payments of $385,000 on the original $50.0 million we
borrowed computed at an annual rate of 9.25% through July 1, 2017. Beginning August 1, 2017, monthly principal and interest
payments of approximately $1.9 million are due on the original $50.0 million we borrowed through the maturity date of
January 1, 2020. In addition, the Oxford/EWB Loan Agreement requires a $3.8 million loan maturity fee upon full repayment
of the initial $50.0 million borrowed and $525,000 for each additional $10.0 million borrowed. We may prepay the outstanding
principal balance in its entirety at any time if we pay a prepayment equal to 1.0% of the then-outstanding principal balance. As
security under the Oxford/EWB Loan Agreement, we granted Oxford, as collateral agent for the lenders, a security interest in
substantially all of our assets, excluding intellectual property (other than proceeds derived from any intellectual property).

F-14

The Oxford/EWB Loan Agreement contains covenants that require us to maintain $10.0 million in restricted cash and
certain eligible term investments, meet an annual OMIDRIA revenue minimum for 2016 and quarterly OMIDRIA revenue
minimums in 2017 and 2018, and to establish an at-the-market (ATM) equity facility that we established on January 6, 2016
(see Note 10). The Oxford/EWB Loan Agreement also contains covenants that limit or restrict our ability to incur indebtedness,
grant liens, merge or consolidate, dispose of assets, make investments, make acquisitions, enter into certain transactions with
affiliates, pay dividends or make distributions, repurchase stock, license our intellectual property for a limited set of our
programs without lender approval or pledge our intellectual property. Additionally, the Oxford/EWB Loan Agreement includes
events of default regarding non-payment, inaccuracy of representations and warranties, covenant breaches, occurrence of a
material adverse effect (MAE, as defined below), cross default to material indebtedness, bankruptcy or insolvency, material
judgments, and a change of control. The occurrence of an event of default could result in the acceleration of the Oxford/EWB
Loan Agreement and, under certain circumstances, could increase our interest rate by 5.0% per annum during the period of
default.

MAE is defined as a material adverse effect upon (i) our business operations, properties, assets, results of operations or

As of December 31, 2015, the outstanding principal on the Oxford/EWB Loan Agreement was $50.0 million and the
remaining unamortized discount and debt issuance costs were $3.8 million and $436,000, respectively. Additionally, there were
no covenant violations during the year ended December 31, 2015.

Equipment Financing

We have capital leases for certain lab and office equipment which have lease terms expiring between October 2017 and

June 2019. Equipment costs related to these capital leases of $367,000 and $230,000 is included in our property and equipment
as of December 31, 2015 and December 31, 2014, respectively and the accumulated depreciation on this equipment was
$98,000 and $52,000, respectively. The remaining principal payments under these capital leases totaled $281,000 and $185,000
as of December 31, 2015 and 2014, respectively.

Future Principal Payments

Future principal payments as of December 31, 2015 under the Oxford/EWB Loan Agreement and our capital equipment

financing leases, based on stated contractual maturities, are as follows:

Year Ending December 31,

2016

2017

2018

2019

2020

Total future principal payments

Total

(In thousands)

7,627

19,432

21,258

1,891

50,281

The principal payments reflected in the table above exclude the $436,000 unamortized balance of the debt discount.

F-15

Note 8—Grant Revenue

Revenues recognized from grants are as follows:

Small Business Innovative Research Grants (SBIR)

Vulcan Inc.

Total revenue

Year Ended December 31,

2015

2014

2013

(In thousands)
539
$

—

539

245

—

245

630

970

1,600

We have periodically received Small Business Innovative Research (SBIR) grants from the National Institutes of Health
(NIH) which are used to support the research and development of our product candidates. We recorded revenue related to these
grants of $245,000, $539,000 and $630,000 for the years ended December 31, 2015, 2014 and 2013, respectively. We recorded
cost reductions to property and equipment due to assets being purchased with grant funding of $80,000 for the year ended
December 31, 2014. We had no similar cost reductions to property and equipment for the years ended December 31, 2015 and
2013. As of December 31, 2015, $219,000 of potential revenue remained available under these grants, if qualifying research is
performed.

In 2010, we entered into a platform development funding agreement with Vulcan Inc. and its affiliate (collectively,
Vulcan) pursuant to which we received $20.0 million for our G protein-coupled receptor (GPCR) program. The revenue was
recognized as costs were incurred or as a reduction to the costs of assets purchased in direct proportion to the related GPCR
expenses. For the year ended December 31, 2013, we recognized all the remaining revenue of $970,000 from this funding
agreement.

Note 9—Commitments and Contingencies

Real Estate and Equipment Lease Obligations

We lease office and laboratory spaces in The Omeros Building. The initial term of this lease ends in November 2027 and

we have two options to extend the lease term, each by five years. As of December 31, 2015, the remaining aggregate non-
cancelable rent under the initial terms of the lease was $54.5 million. The deferred rent balance of $9.2 million relates to rent
deferrals and landlord funded lease incentives since the inception of our lease and is being amortized to research and
development and selling, general and administrative expense on a straight-line basis through the initial term of the lease.

Rent expense, including the amortization of lease incentives and rent deferrals, totaled $4.5 million, $4.5 million and $4.3

million for the years ended December 31, 2015, 2014 and 2013, respectively.

We periodically sublease unused office and laboratory space in The Omeros Building to third-party tenants. Rental
income received under these subleases was $889,000, $568,000 and $550,000 for the years ended December 31, 2015, 2014
and 2013, respectively. Rental income is recorded as other income in the accompanying Consolidated Statements of Operations
and Comprehensive Loss.

F-16

We rent equipment under various operating lease agreements which have remaining aggregate non-cancellable rent of

$76,000 at December 31, 2015.

Future minimum payments related to these leases and The Omeros Building lease, which exclude common area

maintenance and related operating expenses, at December 31, 2015, are as follows:

Year Ending December 31,

2016

2017

2018

2019

2020

Thereafter

Total

Contracts

Lease
Payments

Sublease
Receipt

Net Lease
Payments

4,106

4,188

4,259

4,350

4,450

33,263

(In thousands)
682
$

580

—

54,616

1,262

3,424

3,608

4,259

4,350

4,450

33,263

53,354

As of December 31, 2015, we have a firm purchase commitment with Patheon for the manufacture of $1.3 million of

commercial supply of OMIDRIA. We anticipate receiving the product during the first quarter of 2016.

Development Milestones and Product Royalties

Phosphodiesterase 10 (PDE10) inhibitors - In connection with a funding agreement with The Stanley Medical

Research Institute entered into in December 2006, beginning the first calendar year after commercial sales of any therapeutic
product that inhibits or modulates PDE10 (including for schizophrenia or Huntington’s disease), we are obligated to pay
royalties based on net income of the product, as defined in the agreement. Based on the amount of grant funding received, the
maximum amount of royalties payable by us is $12.8 million. For the years ended December 31, 2015, 2014 and 2013, we did
not owe any royalties.

Peroxisome proliferators activated receptor gamma (PP

- In February 2009, we entered into a patent assignment
agonists for the

agreement whereby we acquired all intellectual property rights, including patent applications, related to PP
treatment and prevention of addictions to substances of abuse, as well as other compulsive behaviors. In February 2011, we
amended the patent assignment agreement to include all intellectual property rights, including patent applications, related to
activity. We will be required to make payments up to $3.8 million in total, for both
dietary supplements that increase PP
PP
as the initiation of clinical trials and receipt of marketing approval. In addition, we are obligated to pay a low single-digit
percentage royalty on any net sales of drug products that are covered by the patent assignment agreement. For the years ended
December 31, 2015, 2014 and 2013, we did not owe any development milestones or royalties.

activity, upon achievement of certain development events, such

agonists and dietary supplements that increase PP

Phosphodiesterase 7 (PDE7) inhibitors - Under a license agreement with Daiichi Sankyo Co., Ltd. (Daiichi Sankyo)

we hold an exclusive license to phosphodiesterase 7 (PDE7) inhibitors owned by Daiichi Sankyo for use in (1) the treatment of
movement disorders and other specified indications; (2) addiction and compulsive disorders; and (3) all other indications
except those related to dermatologic conditions. We will be required to make milestone payments to Daiichi Sankyo of up to
$33.5 million upon the achievement of certain events, such as successful completion of certain preclinical toxicology studies;
dosing of human subjects in Phase 1, 2 and 3 clinical trials; receipt of marketing approval of a PDE7 inhibitor product; and
reaching specified sales milestones. However, if only one of the three indications is advanced through each milestone, the total
milestone payments would be $23.5 million. In addition, we are obligated to pay Daiichi Sankyo a low single-digit percentage
royalty on any net sales of a PDE7 inhibitor licensed under the agreement provided that if the sales are made by a sublicensee,
the amount payable by us to Daiichi Sankyo is capped at a low double-digit percentage of all royalty and specified milestone
payments that we receive from the sublicensee. For the year ended December 31, 2013, we paid $50,000 upon execution of an
amendment which was recognized as research and development expense. For the years ended December 31, 2015, 2014 and
2013, we did not owe any development milestones or royalties.

Mannan-binding lectin-associated serine protease-2 (MASP-2) - In April 2010, we entered into an exclusive license

agreement with Helion Biotech ApS (Helion), pursuant to which we received a royalty bearing, worldwide exclusive license to
all of Helion’s intellectual property rights related to MASP-2 antibodies, polypeptides and methods in the field of inhibition of
mannan-binding lectin-mediated activation of the complement system for the prevention, treatment or diagnosis of any disease
F-17

or condition. We will be required to make development and sales milestone payments to Helion of up to $6.1 million upon the
achievement of certain events, such as the filing of an Investigational New Drug Application (IND) with the FDA; initiation of
Phase 2 and 3 clinical trials; receipt of marketing approval; and reaching specified sales milestones. We are obligated to pay
Helion a low single-digit percentage royalty on net sales of a MASP-2 inhibitor product covered by the patents licensed under
the agreement. For the year ended December 31, 2015, we did not owe any development milestones or royalties. For the years
ended December 31, 2014 and 2013, we incurred development milestone costs of $300,000 and $200,000, respectively, under
this agreement which was recognized as research and development expense.

G protein-coupled receptor (GPCR) - In connection with our funding agreements with Vulcan and LSDF discussed in

Note 8, we agreed to pay Vulcan and LSDF tiered percentages of the net proceeds derived from the GPCR program. The
percentage rates decrease as the cumulative net proceeds reach specified thresholds, and the blended percentage rate in the
aggregate is in the mid-teens with respect to approximately the first $1.5 billion of cumulative net proceeds. If we receive
cumulative net proceeds in excess of approximately $1.5 billion, the percentage rate decreases to one percent. Pursuant to the
agreement with Vulcan, we may pay a portion of Vulcan’s share of the one percent of net proceeds to a life sciences initiative
(LSI) to be established in accordance with the LSDF agreement. The LSI will be a non-profit, tax-exempt organization with a
mission to advance life sciences in the State of Washington.

Net proceeds are generally defined in the Vulcan and LSDF agreements as (1) all consideration received by us in any
form relating directly to the GPCR program less (2) all expenses and expenditures in excess of $25.0 million incurred by us in
connection with the GPCR program. Any consideration that we receive (a) from government entities (subject to specified
exceptions), (b) from third parties that have designated such consideration for the purpose of funding research and development
expenses and related overhead or (c) in the form of grants, as well as any expenses or expenditures that we incur that are paid
for with such consideration, are excluded for purposes of determining net proceeds.

Under our agreement with LSDF, after LSDF receives $25.0 million, any remaining amounts that would be payable to

LSDF will be paid to LSI. Our obligations with respect to LSI are limited to creating LSI’s charter documents, incorporating
LSI, selecting directors and applying for tax exempt status, all in consultation with LSDF. The term of our agreement with
LSDF expires on the six-month anniversary following the last date that we deliver a report related to our incurrence of grant-
funded expenses described in the agreement. The term of our payment obligations to LSDF is the same as that under our
agreement with Vulcan.

As of December 31, 2015, we have not derived any net proceeds as defined in the Vulcan and LSDF agreements from

our GPCR program.

Litigation

In July 2015, we received a Notice Letter from Par Pharmaceutical, Inc. and its subsidiary, Par Sterile Products, LLC,
(collectively, Par) stating that Par filed an Abbreviated New Drug Application (ANDA) containing a Paragraph IV Certification
under the Hatch-Waxman Act seeking approval from the FDA to market a generic version of OMIDRIA prior to the expiration
of three patents listed in the FDA’s Approved Drug Products with Therapeutic Equivalence Evaluations (Orange Book) for
OMIDRIA (the Orange Book Patents). Following receipt of the Paragraph IV Notice Letter, in September 2015 we filed a
patent infringement lawsuit under the Hatch-Waxman Act against Par in the U.S. District Court for the District of New
Jersey and in the U.S. District Court for the District of Delaware. Based on our decision to pursue the action in federal court in
Delaware, we voluntarily dismissed the complaint filed in the U.S. District Court for the District of New Jersey. The complaint
that we filed in the U.S. District Court for the District of Delaware has been served on Par and Par has filed an answer asserting
defenses and counterclaims for declaratory judgment of patent invalidity and non-infringement. We intend to seek leave to
amend the lawsuit to assert a fourth patent, that issued after Par’s Notice Letter, and which was granted by the U.S. Patent and
Trademark Office (USPTO) after the USPTO considered all alleged prior art that was identified by Par in its Paragraph IV
Notice Letter. The filing of suit against Par triggered a 30-month stay of the FDA’s approval of Par’s ANDA, which is expected
to remain in effect until late January 2018. We have reviewed the assertions in Par’s Paragraph IV Notice Letter and believe
they do not have merit, and we intend to prosecute vigorously our patent infringement claims against Par.

F-18

In connection with an administrative review by NIH of the grants that were the subject of the Klein lawsuit, we

reimbursed the NIH $1.1 million in October 2013. The payment was recorded as selling, general and administrative expense in
the accompanying Consolidated Statement of Operations and Comprehensive Loss.

In October 2013, we and our chief executive officer entered into a settlement agreement with our former insurer related to

our former insurer’s defense of, and coverage obligations related to, the Klein lawsuit. Per the settlement agreement, we
received $12.5 million in October 2013 which we recorded as litigation settlement in the accompanying Consolidated
Statements of Operation and Comprehensive Loss. We considered this particular litigation settlement an infrequent item given
the nature of the lawsuit and have included the settlement as a separate component of non-operating income.

Note 10—Shareholders’ Equity

Common Stock

As of December 31, 2015, we had reserved shares of common stock for the following purposes:

Options granted and outstanding

Options available for future grant

Common stock warrants

Total shares reserved

8,310,235

1,724,987

749,250

10,784,472

Options Available for Future Grant - On January 1, 2016, an additional 1,785,714 shares became available for future

issuance under the 2008 Equity Incentive Plan (the 2008 Plan) in accordance with the annual increase provisions of the 2008
Plan. These additional shares are not included in the table above.

At Market Issuance Sales Agreement - In January 2016, we entered into an At Market Issuance Sales Agreement (the
ATM Agreement) with JonesTrading Institutional Services LLC (JonesTrading) pursuant to which we may direct JonesTrading
to sell shares of our common stock with an aggregate offering price of up to $100 million directly on The Nasdaq Global
Market, through a market maker other than on an exchange or in negotiated transactions. Any sales made under the ATM
Agreement are based solely on our instructions and JonesTrading will receive a 1.7% commission from the gross proceeds. The
ATM Agreement may be terminated by either party at any time upon 10 days' notice to the other party or by JonesTrading at
any time in certain circumstances including the occurrence of a material adverse effect to Omeros.

Securities Offerings - In February 2015, we sold 3.4 million shares of our common stock at a public offering price of
$20.03 and sold pre-funded warrants to purchase up to 749,250 shares of our common stock at a public offering price of $20.02
per pre-funded warrant share. The public offering price for the pre-funded warrants was equal to the public offering price of the
common stock, less the $0.01 per share exercise price of each pre-funded warrant. After deducting underwriter discounts and
offering expenses of $4.9 million, we received net proceeds from the transaction of $79.1 million.

In March 2014, we sold 3.5 million shares of our common stock at a public offering price of $11.50 per share. After
deducting underwriter discounts and offering expenses of $2.5 million, we received net proceeds from the transaction of $37.8
million.

In October 2013, we sold 374,000 shares of our common stock with a weighted average price of $13.29 per share under

an at-the-market sales agreement and received $4.9 million in net proceeds. The agreement expired in April 2014.

In May 2013, we sold 3.9 million shares of our common stock at a price of $4.14 per share in a registered direct offering.

After deducting offering expenses of $39,000, we received net proceeds from the transaction of $16.1 million.

Warrants

The following table summarizes our outstanding pre-funded warrants at December 31, 2015, which have an exercise price

of $0.01:

Outstanding At
December 31, 2015
749,250

Expiration Date
February 2, 2022

Exercise Price
$0.01

In March 2009, we issued warrants with an exercise price of $12.25 per share to brokers who assisted us in our Series E

financing (the Series E Warrants). In March 2013, we extended the expiration dates of the Series E Warrants by one year and in
each of March 2014 and September 2014 we extended their expiration by six months. We evaluated the fair value of the Series
E Warrants before and after each modification, and we recorded $863,000 and $41,000 change in fair value as other expense in

F-19

the accompanying Consolidated Statement of Operations and Comprehensive Loss for the years ended December 31, 2014 and
2013, respectively.

For the year ending December 31, 2014, Series E Warrants were exercised, through cash and cashless net exercise,
resulting in cash proceeds of $68,000 and the issuance of 28,653 shares of our common stock. Additionally, for the year ended
December 31, 2015, we received cash proceeds of $1.4 million upon the cash and cashless exercise of Series E Warrants which
resulted in the issuance of 133,240 shares of our common stock.

Note 11—Stock-Based Compensation

The 2008 Plan provides for the grant of incentive and non-statutory stock options, restricted stock, stock appreciation

rights, performance units and performance shares to employees, directors and consultants and subsidiary corporations’
employees and consultants. Options are granted with exercise prices equal to the closing fair market value of the common stock
on the date of the grant. The terms of options may not exceed 10 years and options generally vest over a four-year period.

The 2008 Plan also allows any shares returned under our Amended and Restated 1998 Stock Option Plan (the 1998 Plan),
as a result of cancellation of options or repurchase of shares issued pursuant to the 1998 Plan, to be issued under the 2008 Plan.
In addition, the 2008 Plan provides for annual increases in the number of shares available for issuance thereunder on the first
day of each year, equal to the lower of:

•

five percent of the outstanding shares of our common stock on the last day of the preceding year;

1,785,714 shares; or

such other amount as our board of directors may determine.

As of December 31, 2015, a total of 10,035,222 shares were reserved for issuance under our stock plans, of which

1,724,987 were available for future grants. On January 1, 2016, an additional 1,785,714 shares became available for future
issuance under our 2008 Plan in accordance with the annual increase. In February 2016, approximately 1.3 million shares were
granted to employees related to annual performance grants.

Compensation cost for stock options granted to employees and directors is based on the grant-date fair value and is
recognized over the vesting period of the applicable option on a straight-line basis. Stock-based compensation expense is based
on options ultimately expected to vest, and therefore has been reduced for estimated forfeitures. We estimate forfeitures based
on our historical experience; separate groups of employees that have similar historical forfeiture behavior are considered
separately for expense recognition.

The fair value of each option grant to employees and directors is estimated on the date of grant using the Black-Scholes
option-pricing model. The following assumptions were applied to employee & director stock option grants during the periods
ended:

Estimated weighted-average fair value

Weighted-average assumptions:

Expected volatility

Expected term, in years

Risk-free interest rate

Expected dividend yield

2015

Year Ended December 31,
2014

2013

11.31

7.39

6.87

71%

6.0

1.68%

—%

73%

5.8

1.87%

—%

88%

5.8

1.66%

—%

(A) Expected Volatility. Prior to October 14, 2014 the expected volatility rate used to value stock option grants was based on

volatilities of a peer group of similar companies whose share prices were publicly available due to our limited trading
history. The peer group was developed based on companies in the pharmaceutical and biotechnology industry in a similar
stage of development. As of October 2014, we determined it was appropriate to rely 100% on our own historical realized
volatility given our own trading history was roughly equivalent to the average expected term of our options and we do
not anticipate future volatility will differ significantly from the past. This change in estimate did not have a material
impact on our operating income, net income or earnings per share.

(B) Expected Term. We elected to utilize the “simplified” method for “plain vanilla” options to determine the expected term
of our stock option grants. We will continue to use the simplified method until we have sufficient historical data
necessary to provide a reasonable estimate of expected life based on the exercise behavior of our option holders. Under
this approach, the weighted-average expected life is presumed to be the average of the vesting term and the contractual
term of the option.

F-20

(C) Risk-free Interest Rate. The risk-free interest rate assumption was based on zero-coupon U.S. Treasury instruments that

had terms consistent with the expected term of our stock option grants.

(D) Expected Dividend Yield. We have never declared or paid any cash dividends and do not presently plan to pay cash

dividends in the foreseeable future.

Stock options granted to non-employees are accounted for using the fair-value approach. The fair value of non-employee

option grants is estimated using the Black-Scholes option-pricing model and are re-measured over the vesting term as earned.
The estimated fair value is charged to expense over the applicable service period. During the years ended December 31, 2015,
2014 and 2013, we granted to non-employees options to purchase 4,200 shares, 86,000 shares and 40,000 shares of common
stock, respectively.

Stock-based compensation expense includes amortization of stock options granted to employees and non-employees and

has been reported in our Consolidated Statements of Operations and Comprehensive Loss as follows:

Research and development

Selling, general and administrative

Total stock-based compensation expense

Year Ended December 31,

2015

2014

2013

4,977

4,604

9,581

(In thousands)
4,754
$

4,164

8,918

3,588

2,664

6,252

In connection with the non-employee options, we recognized expense of $492,000, $289,000 and $71,000 during the

years ended December 31, 2015, 2014 and 2013, respectively.

Stock option activity for all stock plans is as follows:

Balance at December 31, 2014

Granted
Exercised
Forfeited and expired
Balance at December 31, 2015
Vested and expected to vest at December 31, 2015
Exercisable at December 31, 2015

Weighted-
Average
Exercise
Price per
Share

Remaining
Contractual
Life
(in years)

Aggregate
Intrinsic
Value
(In thousands)

7.52
17.90
5.13
12.36
7.97
7.85
6.61

6.07
6.00
5.24

$
$
$

65,610
64,731
56,757

Options
Outstanding
8,364,469
350,975
(277,356)
(127,853)
8,310,235
8,096,339
6,217,364

$
$
$

The total intrinsic value of options exercised during the years ended December 31, 2015, 2014 and 2013 was $3.9

million, $2.9 million and $1.1 million, respectively.

F-21

Information about stock options outstanding and exercisable is as follows:

Range of Exercise Price

$0.98-$4.09

$4.10-$8.00

$8.01-$11.42

$11.43-$25.00

$0.98-$25.00

December 31, 2015

Options Outstanding

Options Exercisable

Number of
Options

1,434,412

1,975,794

2,735,818

2,164,211

8,310,235

Weighted-
Average
Remaining
Contractual
Life (Years)

Weighted-
Average
Exercise
Price

1.07

5.12

7.17

8.86

6.07

1.17

5.25

9.79

12.66

7.97

Number of
Options

1,434,412

1,958,011

2,063,009

761,932

6,217,364

Weighted-
Average
Exercise
Price

1.17

5.23

9.81

11.73

6.61

At December 31, 2015, there were 2,092,871 unvested options outstanding that will vest over a weighted-average period

of 2.1 years. Excluding non-employee stock options, the remaining estimated compensation expense to be recognized in
connection with these options is $12.9 million.

Note 12—Income Taxes

We have a history of losses and therefore have made no provision for income taxes. Deferred income taxes reflect the tax

effect of net operating loss and tax credit carryforwards and the net temporary differences between the carrying amounts of
assets and liabilities for financial reporting purposes and the amounts used for income tax purposes.

Significant components of deferred tax assets are as follows:

Deferred tax assets:

Net operating loss carryforwards

Tax credit carryforwards

Stock-based compensation

Deferred rent

Other

Total deferred tax assets

Less valuation allowance

Net deferred tax assets

December 31,

2015

2014

(In thousands)

110,092

88,399

14,758

8,136

3,324

2,744

139,054
(139,054)

— $

9,569

5,511

3,077

2,084

108,640
(108,640)
—

As of December 31, 2015 and 2014, we had Federal net operating loss carryforwards of approximately $325.9 million

and $264.1 million, respectively, state net operating losses of approximately $30.6 million and $100,000, respectively, and tax
credit carryforwards of approximately $14.8 million and $9.6 million, respectively. Approximately $5.9 million of our net
operating loss carryforwards relate to tax deductible stock-based compensation in excess of amounts recognized for financial
statement purposes. To the extent that net operating loss carryforwards, if realized, relate to stock-based compensation, the
resulting tax benefits will be recorded to shareholders’ equity, rather than to the results of operations.

In certain circumstances, due to ownership changes, our net operating loss and tax credit carryforwards may be subject to

limitations under Section 382 of the Internal Revenue Code. To date, we have not completed a Section 382 study. Unless
previously utilized, our net operating loss and research and development tax credit carryforwards expire between 2018 and
2035.

F-22

We have established a 100% valuation allowance due to the uncertainty of our ability to generate sufficient taxable
income to realize the deferred tax assets. Our valuation allowance increased $30.4 million, $25.8 million and $14.5 million in
2015, 2014 and 2013, respectively, primarily due to net operating losses incurred during these periods.

Reconciliation of income tax computed at Federal statutory rates to the reported provisions for income taxes is as

follows:

Federal statutory tax rate

State tax rates

Other permanent differences

Change in valuation allowance

Tax credits

Other

Effective tax rate

Year ended December 31,

2015

2014

2013

(34)%

(2)%

1 %

41 %

(5)%

(1)%

— %

(34)%

— %

2 %

35 %

(4)%

1 %

— %

(34)%

— %

3 %

36 %

(5)%

— %

We file Federal and state income tax returns, which provides varying statutes of limitations on assessments. However,

because of net operating loss carryforwards, substantially all of our tax years remain open to federal and state tax examination.

The guidance for accounting for uncertainties in income taxes requires that we recognize the financial statement effects

of a tax position when it is more likely than not, based on the technical merits, that the position will be sustained upon
examination. As of December 31, 2015, 2014 and 2013, we maintained an uncertain tax position of $212,000 related to a
reduction of our research and development credit deferred tax asset. Further, there were no unrecognized tax benefits that, if
recognized, would impact our effective tax rate.

We recognize interest and penalties related to the underpayment of income taxes as a component of income tax expense.

To date, there have been no interest or penalties charged to us in relation to the underpayment of income taxes.

Note 13—401(k) Retirement Plan

We have adopted a 401(k) plan. To date, we have not matched employee contributions to the plan. All employees are

eligible to participate, provided they meet the requirements of the plan.

F-23

Note 14—Quarterly Information (Unaudited)

The following table summarizes the unaudited statements of operations and comprehensive loss for each quarter of 2015

and 2014 (in thousands, except per share amounts):

2015

For the Quarter Ended

Revenue

Total operating expenses

Loss from operations

Net loss

Basic and diluted net loss per share

2014

Revenue

Total operating expenses

Loss from operations

Net loss

Basic and diluted net loss per share

March 31,

June 30,

388

3,187

September 30,
3,259
$

December 31,
6,675
$

18,318
(17,930)
(18,669)

19,154
(15,967)
(16,680)

22,560
(19,301)
(19,921)

24,715
(18,040)
(19,826)

(0.51) $

(0.44) $

(0.53) $

(0.52)

For the Quarter Ended

March 31,

June 30,

100

September 30,
214
$

December 31,
180
$

15,784
(15,684)
(16,642)

17,262
(17,217)
(17,991)

17,346
(17,132)
(18,327)

20,155
(19,975)
(20,713)

(0.54) $

(0.53) $

(0.54) $

(0.61)

F-24

EXHIBIT INDEX

Exhibit
No.

Exhibit Description

Form

File No.

Exhibit
No.

Filing Date

Filed
Herewith

Incorporated by Reference

3.1

3.2

4.1

4.2

10.1*

10.2*

10.3*

10.4*

10.5*

10.6*

10.7*

Amended and Restated Articles of Incorporation of Omeros

10-K 001-34475

3.1

03/31/2010

Corporation

Amended and Restated Bylaws of Omeros Corporation

10-K 001-34475

Form of Omeros Corporation common stock certificate

S-1/A 333-148572

Form of Omeros Corporation Pre-Funded Warrant to

8-K 001-34475

Purchase Common Stock

3.2

4.1

03/31/2010

10/02/2009

02/02/2015

Form of Indemnification Agreement entered into between

Omeros Corporation and its directors and officers

S-1

333-148572

10.1

01/09/2008

Second Amended and Restated 1998 Stock Option Plan

S-1

333-148572

10.2

01/09/2008

Form of Stock Option Agreement under the Second

Amended and Restated 1998 Stock Option Plan (that does
not permit early exercise)

S-1

333-148572

10.3

01/09/2008

nura, inc. 2003 Stock Plan

S-1

333-148572

10.6

01/09/2008

Form of Stock Option Agreement under the nura, inc. 2003

S-1

333-148572

10.7

01/09/2008

Stock Plan

2008 Equity Incentive Plan

S-1/A 333-148572

10.8

04/01/2008

Form of Stock Option Award Agreement under the 2008

10-Q 001-34475

10.2

11/07/2013

Equity Incentive Plan

10.8*

Second Amended and Restated Employment Agreement

8-K 001-34475

10.1

04/12/2010

between Omeros Corporation and Gregory A.
Demopulos, M.D. dated April 7, 2010

10.9*

Offer Letter between Omeros Corporation and Marcia S.

S-1

333-148572

10.12

01/09/2008

Kelbon, Esq. dated August 16, 2001

10.10*

Technology Transfer Agreement between Omeros

S-1

333-148572

10.14

01/09/2008

Corporation and Gregory A. Demopulos, M.D. dated June
16, 1994

10.11

Technology Transfer Agreement between Omeros

S-1

333-148572

10.15

01/09/2008

10.12*

10.13

10.14*

Corporation and Pamela Pierce, M.D., Ph.D. dated June
16, 1994

Second Technology Transfer Agreement between Omeros
Corporation and Gregory A. Demopulos, M.D. dated
December 11, 2001

Second Technology Transfer Agreement between Omeros

Corporation and Pamela Pierce, M.D., Ph.D. dated March
22, 2002

Technology Transfer Agreement between Omeros

Corporation and Gregory A. Demopulos, M.D. dated
June 16, 1994 (related to tendon splice technology)

S-1

333-148572

10.16

01/09/2008

S-1

333-148572

10.17

01/09/2008

S-1

333-148572

10.18

01/09/2008

10.15

Lease dated January 27, 2012 between Omeros Corporation

8-K 001-34475

10.1

02/01/2012

and BMR-201 Elliott Avenue LLC

10.16

10.17

10.18

10.19

First Amendment to Lease dated November 5, 2012

between Omeros Corporation and BMR-201 Elliott
Avenue LLC

Second Amendment to Lease dated November 16, 2012
between Omeros Corporation and BMR-201 Elliott
Avenue LLC

10-Q 001-34475

10.2

11/09/2012

10-K 001-34475

10.18

03/18/2013

Third Amendment to Lease dated October 16, 2013 between
Omeros Corporation and BMR-201 Elliott Avenue LLC

10-K 001-34475

10.18

03/13/2014

Fourth Amendment to Lease dated September 8, 2015
between Omeros Corporation and BMR-201 Elliott Avenue
LLC

10-Q 001-34475

10.3

11/09/2015

10.20†

Commercial Supply Agreement between Omeros

S-1/A 333-148572

10.28

09/16/2009

10.21†

10.22†

10.23†

10.24†

Corporation and Hospira Worldwide, Inc. dated October
9, 2007

Exclusive License and Sponsored Research Agreement
between Omeros Corporation and the University of
Leicester dated June 10, 2004

Research and Development Agreement First Amendment
between Omeros Corporation and the University of
Leicester dated October 1, 2005

Research and Development Agreement Eighth and Ninth
Amendments between Omeros Corporation and the
University of Leicester dated March 21, 2012 and
September 1, 2013

Exclusive License and Sponsored Research Agreement

between Omeros Corporation and the Medical Research
Council dated October 31, 2005

S-1/A 333-148572

10.29

09/16/2009

S-1

333-148572

10.30

01/09/2008

10-K 001-34475

10.24

03/16/2015

S-1/A 333-148572

10.31

09/16/2009

10.25†

Amendment dated May 8, 2007 to Exclusive License and

S-1

333-148572

10.32

01/09/2008

Sponsored Research Agreement between Omeros
Corporation and the Medical Research Council dated
October 31, 2005

Funding Agreement between Omeros Corporation and The
Stanley Medical Research Institute dated December 18,
2006

S-1/A 333-148572

10.33

05/15/2009

Patent Assignment Agreement between Omeros Corporation
and Roberto Ciccocioppo, Ph.D. dated February 23, 2009

S-1/A 333-148572

10.47

09/16/2009

First Amendment to Patent Assignment Agreement between
Omeros Corporation and Roberto Ciccocioppo, Ph.D.
effective December 31, 2010

10-K 001-34475

10.28

03/18/2013

10.26†

10.27†

10.28†

10.29*

Omeros Corporation Non-Employee Director

S-1/A 333-148572

10.50

09/16/2009

Compensation Policy

10.30†

License Agreement between Omeros Corporation and

10-Q 001-34475

10.1

05/12/2010

Daiichi Sankyo Co., Ltd. (successor-in-interest to Asubio
Pharma Co., Ltd.) dated March 3, 2010

10.31†

10.32†

Amendment No. 1 to License Agreement with an effective

date of January 5, 2011 between Omeros Corporation and
Daiichi Sankyo Co., Ltd.

Amendment No. 2 to License Agreement with an effective
date of January 25, 2013 between Omeros Corporation
and Daiichi Sankyo Co., Ltd.

10-Q 001-34475

10.1

05/10/2011

10-Q 001-34475

10.1

05/09/2013

10.33†

Exclusive License Agreement between Omeros Corporation

10-Q 001-34475

10.2

08/10/2010

and Helion Biotech ApS dated April 20, 2010

10.34†

Platform Development Funding Agreement between

Omeros Corporation and Vulcan Inc. and its affiliate
dated October 21, 2010

10-K 001-34475

10.44

03/15/2011

10.35†

Grant Award Agreement between Omeros Corporation and

10-K 001-34475

10.45

03/15/2011

the Life Sciences Discovery Fund Authority dated
October 21, 2010

10.36†

10.37†

Pharmaceutical Manufacturing and Supply Agreement dated
March 5, 2014 by and between Patheon Manufacturing
Services, LLC (successor-in-interest to DSM
Pharmaceuticals, Inc.) and Omeros Corporation

First Amendment to Pharmaceutical Manufacturing and
Supply Agreement between Patheon Manufacturing
Services (successor-in-interest to DSM Pharmaceuticals,
Inc.) and Omeros Corporation dated July 7, 2015

10.38† Master Services Agreement between Omeros Corporation
and Ventiv Commercial Services, LLC, made as of May
12, 2014

10.39†

10.40

10.41†

10.42

Project Agreement (Detailing and Sales Operation Services)
between Omeros Corporation and Ventiv Commercial
Services, LLC, made as of May 12, 2014

First Amendment to Project Agreement (Detailing and Sales
Operation Services) between Omeros Corporation and
Ventiv Commercial Services, LLC, dated June 13, 2014

Second Amendment to Project Agreement (Detailing and
Sales Operation Services) between Omeros Corporation
and Ventiv Commercial Services, LLC, made as of
October 17, 2014

Project Agreement (Sales Operation Services for Client

Sales Teams) between Omeros Corporation and Ventiv
Commercial Services, LLC, made as of January 1, 2016

10-Q 001-34475

10.5

05/12/2014

10-Q 001-34475

10.2

11/09/2015

10-Q 001-34475

10.1

08/11/2014

10-Q 001-34475

10.2

08/11/2014

10-Q 001-34475

10.3

08/11/2014

10-K 001-34475

10.45

03/16/2015

10.43†

Commercial Supply Agreement among Omeros

10-K 001-34475

10.46

03/16/2015

10.44†

10.45†

10.46

10.47

10.48

Corporation, Hospira S.p.A. and Hospira Worldwide, Inc.
dated October 3, 2014

First Amendment to Commercial Supply Agreement dated
August 1, 2015 by and between Omeros Corporation and
Hospira Worldwide, Inc.

License Agreement effective as of June 9, 2015 by and

between Omeros Corporation, JCB Laboratories, LLC,
and Fagron Compounding Services, LLC, d/b/a Fagron
Sterile Services

At Market Issuance Sales Agreement dated January 6, 2016
between Omeros Corporation and JonesTrading
Institutional Services LLC

Loan and Security Agreement between Omeros and Oxford
Finance LLC, as collateral agent and as a lender, and East
West Bank, as a lender, dated December 30, 2015

Form of Secured Promissory Note issued by Omeros to

Oxford Finance LLC and to East West Bank, each dated
December 30, 2015

12.1

Ratio of Earnings to Fixed Charges

10-Q 001-34475

10.1

11/09/2015

10-Q 001-34475

10.1

08/10/2015

8-K 001-34475

1.1

01/06/2016

8-K 001-34475

10.1

01/06/2016

8-K 001-34475

10.2

01/06/2016

23.1

31.1

31.2

32.1

32.2

Consent of Independent Registered Public Accounting Firm

Certification of Principal Executive Officer Pursuant to
Rule 13-14(a) or Rule 15d-14(a) of the Securities
Exchange Act of 1934 as Adopted Pursuant to Section
302 of the Sarbanes-Oxley Act of 2002

Certification of Principal Financial Officer Pursuant to Rule
13-14(a) or Rule 15d-14(a) of the Securities Exchange
Act of 1934 as Adopted Pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002

Certification of Principal Executive Officer Pursuant to 18
U.S.C. Section 1350, as Adopted Pursuant to Section 906
of the Sarbanes-Oxley Act of 2002

Certification of Principal Financial Officer Pursuant to 18

U.S.C. Section 1350, as Adopted Pursuant to Section 906
of the Sarbanes-Oxley Act of 2002

99.1

Description of Capital Stock

10-K 001-34475

99.1

03/16/2015

101.INS XBRL Instance Document

101.SCH XBRL Taxonomy Extension Schema Document

101.CAL XBRL Taxonomy Extension Calculation Linkbase

Document

101.DEF XBRL Taxonomy Extension Definition Linkbase Document

101.LAB XBRL Taxonomy Extension Labels Linkbase Document

101.PRE XBRL Taxonomy Extension Presentation Linkbase

Document

*
†
††

Indicates management contract or compensatory plan or arrangement.
Portions of this exhibit are redacted in accordance with a grant of confidential treatment.
Portions of this exhibit are redacted in accordance with a request for confidential treatment.

[THIS PAGE INTENTIONALLY LEFT BLANK]

C O N T A C T S + I N F O R M A T I O N

Corporate Headquarters
Omeros Corporation
The Omeros Building
201 Elliott Avenue West
Seattle, WA 98119
206.676.5000
www.omeros.com

2016 Annual Meeting
The 2016 Annual Meeting of Shareholders of
Omeros Corporation will be held June 9, 2016,
beginning at 10:00 A.M. (local time), at:
World Trade Center Seattle
2200 Alaskan Way
Suite 410
Seattle, WA 98121
For further information, contact
Omeros Investor Relations.

Investor Relations
and Media Contact
Investor Relations
Omeros Corporation
The Omeros Building
201 Elliott Avenue West
Seattle, WA 98119
206.676.5000
ir@omeros.com
Copies of Omeros’ Annual Report on Form 10-K
for the fiscal year ended December 31, 2015,
including financial statements, are available
on the Omeros investor relations website at
investor.omeros.com or by written or telephonic
request to Investor Relations at Omeros’
corporate headquarters.

Transfer Agent
and Registrar
Computershare Inc.
P.O. Box 30170
College Station, TX 77842-3170
Toll Free Number: 866.282.4938 (U.S.)
Outside the U.S.: 201.680.6578
TDD for Hearing Impaired: 800.490.1493 (U.S.)
Outside the U.S.: 781.575.4592
www.computershare.com/investor

Independent Registered
Public Accounting Firm
Ernst & Young LLP

Stock Listing
Omeros’ stock trades on The Nasdaq Global
Market under the symbol OMER. For more
information, please visit www.omeros.com.

FORWARD-LOOKING STATEMENTS

This annual report contains forward-looking statements within the
meaning of Section 27A of the Securities Act of 1933 and Section 21E of
the Securities Exchange Act of 1934, which are subject to the “safe harbor”
created by those sections for such statements. All statements other than
statements of historical fact are forward-looking statements, which are
often indicated by terms such as “anticipate,” “believe,” “could,” “estimate,”
“expect,” “goal,” “intend,” “look forward to,” “may,” “plan,” “potential,”
“predict,” “project,” “should,” “will,” “would” and similar expressions and
variations thereof. Forward-looking statements are based on management’s
beliefs and assumptions and on information available to management

only as of the date of this annual report. Omeros’ actual results could differ
materially from those anticipated in these forward-looking statements
for many reasons including, without limitation, the risks, uncertainties
and other factors described under the heading “Risk Factors” in this
annual report. Given these risks, uncertainties and other factors, you
should not place undue reliance on these forward-looking statements,
and Omeros assumes no obligation to update these forward-looking
statements, even if new information becomes available in the future.

William J. Lambert, Ph.D.
Vice President, Chemistry
Manufacturing and Controls

Catherine A. Melﬁ, Ph.D.
Vice President, Regulatory Aﬀairs and Quality Systems

Patricia Sandler
Vice President, Sales and Marketing

J. Steven Whitaker, M.D., J.D.
Vice President, Clinical Development
Chief Medical Oﬃcer

BOARD OF DIRECTORS

Ray Aspiri
Former Chairman of the Board
Tempress Technologies, Inc.

Thomas J. Cable
Vice Chairman of the Board
Washington Research Foundation

Gregory A. Demopulos, M.D.
Chairman and President
Chief Executive Oﬃcer
Omeros Corporation

Peter A. Demopulos, M.D.
Cardiologist
Swedish Heart and Vascular Institute

Arnold C. Hanish
Former VP and Chief Accounting Oﬃcer
Eli Lilly & Company

Leroy E. Hood, M.D., Ph.D.
President, Institute for Systems Biology
Chief Science Oﬃcer
Providence Health & Services

Rajiv Shah, M.D.
Founder and Managing Partner
Latitude Capital
Former Administrator of the
United States Agency for International Development

EXECUTIVE OFFICERS

Gregory A. Demopulos, M.D.
Chairman and President
Chief Executive Oﬃcer

Michael A. Jacobsen
Vice President, Finance
Chief Accounting Oﬃcer and Treasurer

Marcia S. Kelbon, J.D.
Vice President, Patent
General Counsel and Secretary

SIGNIFICANT EMPLOYEES

Christopher S. Bral, Ph.D.
Vice President, Nonclinical Development

Timothy M. Duﬀy
Vice President, Business Development

Kenneth M. Ferguson, Ph.D.
Vice President, Development
Chief Development Oﬃcer

George A. Gaitanaris, M.D., Ph.D.
Vice President, Science
Chief Scientiﬁc Oﬃcer

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201 ELLIOTT
AVENUE WEST
SEATTLE, WA
98119
OMEROS.COM