OMER Institutional Ownership & Shareholders
OMEROS CORP (OMER) is currently held by 170 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $346.69M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of OMER tracked by InsiderSet, reporting ownership valued at approximately $57.48M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $111.46M, representing an estimated gain of +93.90% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 67% of the total disclosed OMER value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Ingalls & Snyder Llc, Ubs Group Ag, and several other long-term asset managers with concentrated positions in OMEROS CORP (OMER).
This page ranks the largest institutional OMER shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
170
Total Reported Value
$346.69M
Largest Holder
Blackrock, Inc.
Largest Position
$57.48M
Insider Transactions (90d)
16
Latest Filing Quarter
Q2 2026
New Institutional Positions
72
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 6,044,633 | $57,484,459 | $111,463,033 | +$53,978,574 | +93.90% | |
| Ingalls & Snyder Llc | 0.95% | 3,659,523 | $34,802,000 | $67,481,604 | +$32,679,604 | +93.90% | |
| Ubs Group Ag | 0.00% | 3,148,384 | $29,941,131 | $58,056,201 | +$28,115,070 | +93.90% | |
| Vanguard Capital Management Llc | 0.00% | 3,072,050 | $29,215,196 | $56,648,602 | +$27,433,406 | +93.90% | |
| State Street Corp | 0.00% | 2,319,906 | $22,062,306 | $42,779,067 | +$20,716,761 | +93.90% | |
| Geode Capital Management, Llc | 0.00% | 1,914,460 | $18,210,941 | $35,302,642 | +$17,091,701 | +93.85% | |
| Stifel Financial Corp | 0.01% | 1,836,925 | $17,469,159 | $33,872,897 | +$16,403,738 | +93.90% | |
| Vanguard Portfolio Management Llc | 0.00% | 962,828 | $9,156,494 | $17,754,548 | +$8,598,054 | +93.90% | |
| Invesco Ltd. | 0.00% | 751,771 | $7,149,343 | $13,862,657 | +$6,713,314 | +93.90% | |
| Northern Trust Corp | 0.00% | 727,348 | $6,917,080 | $13,412,297 | +$6,495,217 | +93.90% | |
| Rock Springs Capital Management Lp | 0.33% | 718,499 | $6,832,925 | $13,249,122 | +$6,416,197 | +93.90% | |
| Corient Private Wealth Llc | 0.01% | 659,730 | $6,274,033 | $12,165,421 | +$5,891,388 | +93.90% | |
| Rubric Capital Management Lp | 0.06% | 656,874 | $6,246,872 | $12,112,757 | +$5,865,885 | +93.90% | |
| Charles Schwab Investment Management Inc | 0.00% | 604,633 | $5,750,060 | $11,149,433 | +$5,399,373 | +93.90% | |
| Bank Of Montreal | 0.00% | 568,424 | $5,405,712 | $10,481,739 | +$5,076,027 | +93.90% | |
| Badgley Phelps Wealth Managers, Llc | 0.09% | 263,556 | $5,018,107 | $4,859,973 | -$158,134 | -3.15% | |
| Vanguard Fiduciary Trust Co | 0.00% | 491,173 | $4,671,055 | $9,057,230 | +$4,386,175 | +93.90% | |
| Federated Hermes, Inc. | 0.01% | 478,290 | $4,548,538 | $8,819,668 | +$4,271,130 | +93.90% | |
| Clutterbuck Capital Management Llc | 2.46% | 450,000 | $4,279,500 | $8,298,000 | +$4,018,500 | +93.90% | |
| Two Sigma Investments, Lp | 0.00% | 402,662 | $3,829,316 | $7,425,087 | +$3,595,771 | +93.90% | |
| Morgan Stanley | 0.00% | 394,459 | $3,751,306 | $7,273,824 | +$3,522,518 | +93.90% | |
| Millennium Management Llc | 0.00% | 343,839 | $3,269,909 | $6,340,391 | +$3,070,482 | +93.90% | |
| Susquehanna International Group, Llp | 0.00% | 325,194 | $3,092,595 | $5,996,577 | +$2,903,982 | +93.90% | |
| Wellington Management Group Llp | 0.00% | 204,541 | $1,945,185 | $3,771,736 | +$1,826,551 | +93.90% | |
| Bank Of New York Mellon Corp | 0.00% | 195,990 | $1,863,861 | $3,614,056 | +$1,750,195 | +93.90% | |
| Bank Of America Corp | 0.00% | 194,140 | $1,846,271 | $3,579,942 | +$1,733,671 | +93.90% | |
| Nuveen, Llc | 0.00% | 169,952 | $1,616,244 | $3,133,915 | +$1,517,671 | +93.90% | |
| Ancora Advisors Llc | 0.03% | 168,750 | $1,604,812 | $3,111,750 | +$1,506,938 | +93.90% | |
| Profund Advisors Llc | 0.04% | 80,616 | $1,534,929 | $1,486,559 | -$48,370 | -3.15% | |
| Goldman Sachs Group Inc | 0.00% | 157,008 | $1,493,146 | $2,895,228 | +$1,402,082 | +93.90% | |
| Wells Fargo & Company/Mn | 0.00% | 156,889 | $1,492,014 | $2,893,033 | +$1,401,019 | +93.90% | |
| Swiss National Bank | 0.00% | 137,300 | $1,305,723 | $2,531,812 | +$1,226,089 | +93.90% | |
| Virtus Investment Advisers, Llc | 0.29% | 133,129 | $1,266,057 | $2,454,899 | +$1,188,842 | +93.90% | |
| Caption Management, Llc | 0.04% | 130,000 | $1,236,300 | $2,397,200 | +$1,160,900 | +93.90% | |
| Mindset Wealth Management, Llc | 0.22% | 64,900 | $1,235,696 | $1,196,756 | -$38,940 | -3.15% | |
| Price T Rowe Associates Inc | 0.00% | 129,550 | $1,233,000 | $2,388,902 | +$1,155,902 | +93.75% | |
| Mml Investors Services, Llc | 0.00% | 118,175 | $1,123,844 | $2,179,147 | +$1,055,303 | +93.90% | |
| Ameriprise Financial Inc | 0.00% | 117,456 | $1,117,006 | $2,165,889 | +$1,048,883 | +93.90% | |
| Rhumbline Advisers | 0.00% | 110,271 | $1,048,666 | $2,033,397 | +$984,731 | +93.90% | |
| Brevan Howard Capital Management Lp | 0.01% | 98,047 | $932,427 | $1,807,987 | +$875,560 | +93.90% | |
| American Capital Advisory, Llc | 0.28% | 43,729 | $832,601 | $806,363 | -$26,238 | -3.15% | |
| Citadel Advisors Llc | 0.00% | 85,594 | $813,999 | $1,578,353 | +$764,354 | +93.90% | |
| Coldstream Capital Management Inc | 0.01% | 84,743 | $805,906 | $1,562,661 | +$756,755 | +93.90% | |
| Quantinno Capital Management Lp | 0.00% | 83,786 | $796,805 | $1,545,014 | +$748,209 | +93.90% | |
| Balyasny Asset Management L.P. | 0.00% | 83,558 | $794,637 | $1,540,810 | +$746,173 | +93.90% | |
| Jupiter Asset Management Ltd | 0.00% | 76,186 | $724,529 | $1,404,870 | +$680,341 | +93.90% | |
| California State Teachers Retirement System | 0.00% | 75,730 | $720,192 | $1,396,461 | +$676,269 | +93.90% | |
| Deutsche Bank Ag\ | 0.00% | 75,053 | $713,754 | $1,383,977 | +$670,223 | +93.90% | |
| Alliancebernstein L.P. | 0.00% | 66,990 | $707,414 | $1,235,296 | +$527,882 | +74.62% | |
| Citigroup Inc | 0.00% | 72,829 | $692,604 | $1,342,967 | +$650,363 | +93.90% |
Frequently asked questions about OMER
Who are the largest institutional holders of OMER?
The largest institutional holders of OMER reported in the latest SEC Form 13F filings include Blackrock, Inc., Ingalls & Snyder Llc, Ubs Group Ag, Vanguard Capital Management Llc, and State Street Corp. InsiderSet ranks institutional holders by their latest reported OMER position.
What is OMER institutional ownership?
This page tracks OMER positions reported by institutional investment managers through SEC Form 13F. OMEROS CORP (OMER) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own OMER?
InsiderSet currently tracks 170 institutional managers reporting OMER holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of OMER shareholders.
How much OMER stock do institutions own?
Institutional investment managers disclosed approximately $346.69M in OMER holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was OMER institutional ownership last updated?
The latest OMER institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional OMER holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its OMER position after the reporting date.
Are institutions buying or selling OMER?
Institutional buying and selling can be analyzed by comparing OMER positions across consecutive 13F reporting periods. InsiderSet's OMER Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View OMER ownership changes.
How has OMER institutional ownership changed over time?
InsiderSet tracks OMER institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.