Omeros Corp
OMER- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001285819
In the last 90 days, Omeros Corp insiders filed 0 open-market purchases and 6 sales; 171 institutions reported holding it in 13F filings for Q2 2026, worth $343.0M in total; no superinvestor holds it.
Holders of 5% or more of OMER
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Omeros Corp, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G/A | 8.20%5.96M shares | – | Jul 29, 20261 filing | Jul 29, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
12 Schedule 13D and 13G filings on Omeros Corp, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Jul 29, 20263:19 PM ET | BlackRock, Inc. | 13G/A | 8.20%5.96M shares | – | Jun 30, 2026 | SEC |
| Apr 23, 202610:08 AM ET | Ingalls & Snyder LLC | 13G/A | 4.80%3.47M shares | −2.40 ppfrom 7.20%Below 5% | Dec 31, 2025 | SEC |
| Mar 27, 202611:04 AM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | −5.66 ppfrom 5.66%Below 5% | Mar 13, 2026 | SEC |
| Jan 30, 20262:19 PM ET | Vanguard Group Inc | 13G | 5.66%4.01M shares | +0.75 ppfrom 4.91% | Dec 31, 2025 | SEC |
| Oct 31, 202511:05 AM ET | Vanguard Group Inc | 13G/A | 4.91%3.35M shares | –Below 5% | Sep 30, 2025 | SEC |
| Feb 21, 20255:42 PM ET | Ingalls & Snyder LLC | 13G/A | 7.20%4.16M shares | – | Dec 31, 2024 | SEC |
| Feb 17, 2021 | Consonance Capital Management LP | 13G/AOld format | – | – | – | SEC |
| Feb 16, 2021 | Consonance Capital Management LP | 13G/AOld format | – | – | – | SEC |
| Feb 16, 2021 | Cormorant Asset Management, LP | 13G/AOld format | – | – | – | SEC |
| Feb 12, 2021 | Demopulos Gregory A MD | 13G/AOld format | – | – | – | SEC |
| Feb 10, 2021 | Vanguard Group Inc | 13GOld format | – | New | – | SEC |
| Feb 9, 2021 | Ingalls & Snyder LLC | 13G/AOld format | – | – | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Omeros Corp shares.
No Form 144 notices for Omeros Corp are on file.