Omeros Corporation
Ownership
Ownership Structure
Who owns Omeros Corporation (OMER)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 95.7% of the shares are freely tradable; institutional investors hold 44.5%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 8.35 | 6,044,633 | +13.8 | 06/30/2026 |
| Ingalls & Snyder LLC | 5.06 | 3,659,523 | +2.8 | 06/30/2026 |
| UBS Group AG | 4.35 | 3,148,384 | +34.5 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.24 | 3,072,050 | +3.0 | 06/30/2026 |
| State Street Corp | 3.20 | 2,319,906 | +20.9 | 06/30/2026 |
| Geode Capital Management, LLC | 2.64 | 1,914,460 | +9.3 | 06/30/2026 |
| Stifel Financial Corp | 2.54 | 1,836,925 | +0.3 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 1.33 | 962,828 | +34.0 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.00 | 2,172,336 | +0.0 | 09/30/2026 |
| iShares Russell 2000 ETF | 2.58 | 1,867,153 | -1.1 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Cable Thomas J. | Director | 35,067 | 624,193 $ | Aug 20, 2026 | direct |
| Cancelmo Peter B | VP, General Counsel | 200 | 3,560 $ | Aug 31, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 23, 2026 | Borges David J. | VP, Finance & CAO | Sell | 10,000 | 20.95 | 209,500 |
| Sep 23, 2026 | Borges David J. | VP, Finance & CAO | Other | 10,000 | 15.58 | 155,800 |
| Sep 22, 2026 | Borges David J. | VP, Finance & CAO | Sell | 10,000 | 20.95 | 209,500 |
| Sep 22, 2026 | Borges David J. | VP, Finance & CAO | Other | 5,000 | 2.94 | 14,700 |
| Aug 31, 2026 | Cancelmo Peter B | VP, General Counsel | Sell | 25,000 | 18.54 | 463,540 |
| Aug 31, 2026 | Cancelmo Peter B | VP, General Counsel | Other | 25,000 | 2.94 | 73,500 |
| Aug 28, 2026 | Cancelmo Peter B | VP, General Counsel | Sell | 25,000 | 18.65 | 466,128 |
| Aug 28, 2026 | Cancelmo Peter B | VP, General Counsel | Other | 25,000 | 2.94 | 73,500 |
| Aug 27, 2026 | Hanish Arnold C | Director | Sell | 5,000 | 19.02 | 95,081 |
| Aug 27, 2026 | Hanish Arnold C | Director | Other | 7,500 | 14.66 | 109,950 |
| Aug 27, 2026 | Hanish Arnold C | Director | Other | 2,500 | 15.81 | 39,525 |
| Aug 26, 2026 | Hanish Arnold C | Director | Sell | 5,000 | 18.53 | 92,633 |
| Aug 26, 2026 | Hanish Arnold C | Director | Other | 5,000 | 15.81 | 79,050 |
| Aug 24, 2026 | Borges David J. | VP, Finance & CAO | Sell | 906 | 19.10 | 17,305 |
| Aug 24, 2026 | Borges David J. | VP, Finance & CAO | Other | 906 | 2.94 | 2,664 |
| Aug 21, 2026 | Borges David J. | VP, Finance & CAO | Sell | 10,000 | 18.95 | 189,500 |
| Aug 21, 2026 | Borges David J. | VP, Finance & CAO | Other | 4,094 | 2.94 | 12,036 |
| Aug 21, 2026 | Borges David J. | VP, Finance & CAO | Other | 5,906 | 3.93 | 23,211 |
| Aug 20, 2026 | Cable Thomas J. | Director | Sell | 15,000 | 18.45 | 276,773 |
| Aug 20, 2026 | Cable Thomas J. | Director | Other | 7,500 | 3.93 | 29,475 |
| Aug 13, 2026 | Borges David J. | VP, Finance & CAO | Sell | 5,000 | 16.95 | 84,750 |
| Aug 13, 2026 | Borges David J. | VP, Finance & CAO | Other | 5,000 | 3.93 | 19,650 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 2, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.