192 institutions reported holding $489.6M of OMEROS CORP (OMER) in SEC 13F filings for 2026-03-31. Largest institutional holders: BlackRock, Inc. ($56.1M), INGALLS & SNYDER LLC ($37.6M), WHITEBOX ADVISORS LLC ($36.4M), DeepCurrents Investment Group LLC ($32.0M), VANGUARD CAPITAL MANAGEMENT LLC ($31.5M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | BlackRock, Inc. | $56.1M | 5.3M | Added |
| 2 | INGALLS & SNYDER LLC | $37.6M | 3.6M | Trimmed |
| 3 | WHITEBOX ADVISORS LLC | $36.4M | 18.0M | Hold |
| 4 | DeepCurrents Investment Group LLC | $32.0M | 15.9M | Added |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $31.5M | 3.0M | New |
| 6 | D. E. Shaw & Co., Inc. | $27.8M | 13.5M | Trimmed |
| 7 | Context Capital Management, LLC | $24.7M | 12.2M | Hold |
| 8 | UBS Group AG | $24.7M | 2.3M | Added |
| 9 | STATE STREET CORP | $20.3M | 1.9M | Added |
| 10 | STIFEL FINANCIAL CORP | $19.3M | 1.8M | Added |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | $18.5M | 1.8M | Added |
| 12 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $14.8M | 1.4M | Trimmed |
| 13 | Affinity Asset Advisors, LLC | $13.2M | 6.5M | Hold |
| 14 | Clutterbuck Capital Management LLC | $12.1M | 4.5M | Trimmed |
| 15 | Corient Private Wealth LLC | $8.5M | 801,411 | Trimmed |
| 16 | VANGUARD PORTFOLIO MANAGEMENT LLC | $7.6M | 718,675 | New |
| 17 | CITADEL ADVISORS LLC | $7.5M | 714,148 | Trimmed |
| 18 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $6.2M | 582,512 | Trimmed |
| 19 | BANK OF MONTREAL /CAN/ | $6.0M | 568,426 | Trimmed |
| 20 | NORTHERN TRUST CORP | $6.0M | 563,867 | Added |
| 21 | VANGUARD FIDUCIARY TRUST CO | $5.2M | 492,345 | New |
| 22 | MILLENNIUM MANAGEMENT LLC | $4.3M | 410,609 | Trimmed |
| 23 | JANE STREET GROUP, LLC | $3.7M | 351,807 | Trimmed |
| 24 | MORGAN STANLEY | $3.4M | 317,892 | Trimmed |
| 25 | TWO SIGMA INVESTMENTS, LP | $3.0M | 286,474 | Trimmed |
Source: SEC Form 13F filings · as of 2026-03-31