– Conference Call Today at 4:30 p.m. ET –

Omeros Corporation (Nasdaq: OMER), a clinical-stage biopharmaceutical company committed to discovering, developing and commercializing small-molecule and protein therapeutics for large-market as well as orphan indications targeting inflammation and immunologic diseases, including complement-mediated diseases and cancers, today announced recent highlights and developments as well as financial results for the first quarter ended March 31, 2022, which include:

• On December 23, 2021, Omeros completed the sale of its commercial ophthalmic product OMIDRIA^® (phenylephrine and ketorolac intraocular solution) 1%/0.3% and certain related assets and liabilities to Rayner Surgical Inc. (“Rayner”). As a result of the transaction, the company reclassified all revenues and expenses related to OMIDRIA to discontinued operations for fiscal year 2021 in its financial statements. Omeros is entitled to royalties on Rayner’s worldwide net sales of OMIDRIA at rates that vary based on geography and certain regulatory contingencies. The royalty rate for U.S. net sales of OMIDRIA is currently 50 percent.

• For the quarter ended March 31, 2022, Omeros earned royalties of $13.8 million based on Rayner’s net sales of $27.7 million, all of which were in the U.S. This is a $6.6 million increase from the $21.1 million of OMIDRIA net sales reported by Omeros in the prior year quarter.

• Net loss was $33.0 million in the current quarter, or $0.53 per share, which included $4.2 million of non-cash expenses, or $0.07 per share. This compares to a net loss of $35.1 million, or $0.57 per share for the prior year quarter, which included $4.1 million of non-cash expenses, or $0.07 per share.

• At March 31, 2022, Omeros had $142.2 million of cash, cash equivalents and short-term investments available for operations, which is a reduction of $15.0 million from December 31, 2021. In addition, at March 31, 2022 Omeros had $16.3 million in receivables, consisting primarily of OMIDRIA royalties related to the first quarter, which are due for payment this month.

• In February 2022, Omeros had a Type A post-action meeting with the United States Food and Drug Administration (FDA) to discuss the Complete Response Letter (CRL) issued by FDA last year regarding the Company’s biologics license application (BLA) for narsoplimab in the treatment of hematopoietic stem cell transplant-associated thrombotic microangiopathy (TA-TMA). FDA was delayed in providing official minutes of the meeting, in which the review division repeated a number of critiques that the Company felt had been adequately addressed or were inaccurate. After close consultation with outside legal and regulatory advisors, Omeros has prepared and expects soon to submit a request for formal dispute resolution. Formal dispute resolution is an official pathway that enables a sponsor to appeal a decision by an FDA division to a higher authority within FDA, in this case the Office of New Drugs. Omeros’ request is for regular approval based on the data in the existing BLA.

“Following our Type A post-action meeting with FDA and preparing our draft request for formal dispute resolution, we remain highly confident in the strength of our data and of the entirety of our BLA,” said Gregory A. Demopulos, M.D., Omeros’ chairman and chief executive officer. “We believe that the BLA warranted approval last year and, given the immediate patient need for narsoplimab, that formal dispute resolution represents the most expeditious path to approval. We now are finalizing the request with our team of regulatory and legal advisors and expect to submit it within a couple of weeks. Physician support is broad, our case for appeal is strong, and we expect to be successful. In addition to our focus on regulatory approval, we believe that there are a series of value-creating events throughout the remainder of 2022, including OMS906 data in patients with paroxysmal nocturnal hemoglobinuria, data from our efforts in COVID-19, as well as updates on our Phase 1 study evaluating our long-acting MASP-2 inhibitor OMS1029, completion of enrollment for the proteinuria endpoint in our narsoplimab ARTEMIS-IgAN trial, and the potential to earn an OMIDRIA-related $200 million commercial milestone payment.”

First Quarter and Recent Developments

Financial Results

On December 23, 2021, Rayner acquired OMIDRIA and the associated business operations. The completion of the sale required Omeros to reclassify all revenues and expenses related to OMIDRIA to discontinued operations for fiscal year 2021 in its financial statements.

Upon closing of the sale of OMIDRIA, Omeros recorded an OMIDRIA contract royalty asset of $184.6 million representing the minimum expected net present value of future U.S. royalty payments. During the first quarter of 2022, we earned royalties of $13.8 million on sales of OMIDRIA which we recorded as a reduction to the OMIDRIA contract royalty asset. We also recorded $7.0 million of income in discontinued operations representing interest income and remeasurement adjustments to the OMIDRIA contract royalty asset.

Total costs and expenses for the first quarter of 2022 were $35.0 million compared to $45.3 million for the first quarter of 2021. The decrease was primarily due to reduced narsoplimab manufacturing activities and reduced narsoplimab pre-launch marketing activities.

Net loss was $33.0 million in the first quarter of 2022, or $0.53 per share, which included $4.2 million of non-cash expenses, or $0.07 per share. This compares to a net loss of $35.1 million, or $0.57 per share, which included non-cash expenses of $4.1 million, or $0.07 per share.

As of March 31, 2022, the company had $142.2 million of cash, cash equivalents and short-term investments, a reduction of $15.0 million from December 31, 2021, and $16.3 million in receivables, net.

Conference Call Details

To access the live conference call via phone, please dial (844) 831-4029 from the United States and Canada or (920) 663-6278 internationally. The participant passcode is 1198541. A telephone replay will be available for one week following the call and may be accessed by dialing (855) 859-2056 from the United States and Canada or (404) 537-3406 internationally. The replay passcode is 1198541.

To access the live or subsequently archived webcast of the conference call on the internet, go to the company’s website at https://investor.omeros.com/upcoming-events.

About Omeros Corporation

Omeros is an innovative biopharmaceutical company committed to discovering, developing and commercializing small-molecule and protein therapeutics for large-market and orphan indications targeting immunologic diseases, including complement-mediated diseases and cancers related to dysfunction of the immune system, as well as addictive and compulsive disorders. Omeros’ lead MASP-2 inhibitor narsoplimab targets the lectin pathway of complement and is the subject of a biologics license application pending before FDA for the treatment of hematopoietic stem cell transplant-associated thrombotic microangiopathy (HSCT-TMA). Narsoplimab is also in multiple late-stage clinical development programs focused on other complement-mediated disorders, including IgA nephropathy, atypical hemolytic uremic syndrome and COVID-19. OMS906, Omeros’ inhibitor of MASP-3, the key activator of the alternative pathway of complement, is initiating a Phase 1b clinical program in paroxysmal nocturnal hemoglobinuria (PNH). For more information about Omeros and its programs, visit www.omeros.com.

Forward-Looking Statements

This press release 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,” “likely,” “look forward to,” “may,” “objective,” “plan,” “potential,” “predict,” “project,” “should,” “slate,” “target,” “will,” “would” and similar expressions and variations thereof. Forward-looking statements, including expectations with regard Omeros’ pursuit of regulatory approval for narsoplimab in HSCT-TMA, including expectations regarding submission of a formal dispute resolution request and the potential or anticipated outcomes thereof, and expectations regarding the initiation or continuation of clinical trials evaluating Omeros’ drug candidates and the anticipated availability of data therefrom, are based on management’s beliefs and assumptions and on information available to management only as of the date of this press release. Omeros’ actual results could differ materially from those anticipated in these forward-looking statements for many reasons, including, without limitation, unanticipated or unexpected outcomes of regulatory processes in relevant jurisdictions, unproven preclinical and clinical development activities, the impact of COVID-19 on our business, financial condition and results of operations, regulatory processes and oversight, challenges associated with manufacture or supply of our investigational or clinical products, changes in reimbursement and payment policies by government and commercial payers or the application of such policies, intellectual property claims, competitive developments, litigation, and the risks, uncertainties and other factors described under the heading “Risk Factors” in the company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 1, 2022. Given these risks, uncertainties and other factors, you should not place undue reliance on these forward-looking statements, and the company assumes no obligation to update these forward-looking statements, whether as a result of new information, future events or otherwise, except as required by applicable law.

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