As of November 6, 2026, Omeros Corp. is a publicly traded company (Nasdaq: OMER); its largest reported holder is BlackRock, with 8.2% on Schedule 13G/A of July 29, 2026. The largest insider holding is Gregory A. Demopulos MD, the chairman and chief executive, with 1,893,253 shares (2.6% of shares outstanding), per Form 4 of February 20, 2026 (Schedule 13G/A, July 29, 2026).
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Is Omeros Corp. a real, registered company?
- Omeros Corp files with the SEC under CIK 1285819 (its SEC filings).
- Its shares are listed under the ticker OMER on Nasdaq (SEC company record).
- Incorporated in Washington; business address in Seattle, Washington, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under OMEROS CORP in our court records and SEC 8-K records (as of 2026-11-06).
- Leadership changes: the latest reported is Joseph Schocken, Director (Form 8-K filed 2026-08-13). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names BlackRock (filed 2026-07-29).
Who are Omeros Corp.'s owners and officers?
Omeros Corp.: incorporated in Washington; business address in Seattle, Washington; industry Pharmaceutical Preparations (Form D, 2026-08-13).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-07-29 | Blackrock, Inc. | 8.2% |
| Schedule 13G/A, 2026-04-23 | Ingalls & Snyder LLC | 4.8% |
| Schedule 13G/A, 2026-03-27 | The Vanguard Group | 0% |
| Schedule 13G, 2026-01-30 | The Vanguard Group | 5.66% |
| Schedule 13G/A, 2025-10-31 | The Vanguard Group | 4.91% |
Questions about who owns Omeros Corp.
Who owns Omeros Corp.?
On this page, one holder's latest ownership filing reports 5% or more of Omeros Corp.: Blackrock, Inc. (8.2%, Schedule 13G/A, filed 2026-07-29).
When did Blackrock, Inc. buy into Omeros Corp.?
The filings give report dates, not purchase dates. The earliest filing from Blackrock, Inc. on this page is the Schedule 13G/A, filed 2026-07-29, reporting 8.2%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 5 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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| Filed | Person | Role | Change | Effective |
|---|---|---|---|---|
| Form 8-K, 2026-08-13 | Joseph Schocken | Director | appointed | |
| Form 8-K, 2026-08-13 | Joseph Schocken | appointed |
Which insiders own Omeros Corp. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the chairman and chief executive: 1,893,253 shares (2.6% of shares outstanding), 1,469,308 held directly and 423,945 indirectly (Form 4, 2026-02-20).
- , a director: 528,082 shares (0.73% of shares outstanding), 380,472 held directly and 147,610 indirectly (Form 3, 2026-08-18).
- , a director: 35,067 shares (0.05% of shares outstanding) (Form 4, 2026-08-21).
- , a director: 12,400 shares (0.02% of shares outstanding), held indirectly through an arnold c. hanish living trust (Form 4, 2026-08-28).
- , the general counsel and vice president: 200 shares (0.00% of shares outstanding) (Form 4, 2026-09-01).
Shares outstanding: 72,388,316 as of 2026-08-07, from the company's latest SEC cover page.
How much has Omeros Corp. raised?
Acquisitions reported on Form 8-K, Item 2.01: completed an acquisition (2025-12-01).
Keep reading
More on Omeros Corp. and the records around it.
Omeros Corp. elsewhere on the record
- Leadership changes Aug 2026
Companies that share a holder
- BlackRock, Inc. also filed stake reports on 1596 other companies: AvePoint, Inc. (Nov 2026), BIOMARIN PHARMACEUTICAL INC (Nov 2026), MSG RANGERS CORP (Nov 2026)
- The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)
Related pages
Filings, cases and notices link to their records. A not-found line names the records searched; it is not proof of absence.
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