OMEROS CORP (OMER) Top Institutional Shareholders
OMEROS CORP (OMER) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $288.36M in OMER holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of OMER tracked by InsiderSet, reporting ownership valued at approximately $56.07M in its March 31, 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 $51.18M, representing an estimated loss of -8.71% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 69% of the total disclosed OMER value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Capital Management 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
158
Total Reported Value
$288.36M
Largest Holder
Blackrock, Inc.
Largest Position
$56.07M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
184
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% | 5,309,626 | $56,069,647 | $51,184,795 | -$4,884,852 | -8.71% | |
| Vanguard Capital Management Llc | 0.00% | 2,983,259 | $31,503,215 | $28,758,617 | -$2,744,598 | -8.71% | |
| Ubs Group Ag | 0.00% | 2,340,731 | $24,718,119 | $22,564,647 | -$2,153,472 | -8.71% | |
| State Street Corp | 0.00% | 1,919,575 | $20,270,712 | $18,504,703 | -$1,766,009 | -8.71% | |
| Stifel Financial Corp | 0.02% | 1,831,585 | $19,341,544 | $17,656,479 | -$1,685,065 | -8.71% | |
| Geode Capital Management, Llc | 0.00% | 1,752,323 | $18,509,126 | $16,892,394 | -$1,616,732 | -8.73% | |
| Corient Private Wealth Llc | 0.01% | 801,411 | $8,462,901 | $7,725,602 | -$737,299 | -8.71% | |
| Vanguard Portfolio Management Llc | 0.00% | 718,675 | $7,589,208 | $6,928,027 | -$661,181 | -8.71% | |
| Charles Schwab Investment Management Inc | 0.00% | 582,512 | $6,151,327 | $5,615,416 | -$535,911 | -8.71% | |
| Bank Of Montreal | 0.00% | 568,426 | $6,002,578 | $5,479,627 | -$522,951 | -8.71% | |
| Northern Trust Corp | 0.00% | 563,867 | $5,954,435 | $5,435,678 | -$518,757 | -8.71% | |
| Vanguard Fiduciary Trust Co | 0.00% | 492,345 | $5,199,163 | $4,746,206 | -$452,957 | -8.71% | |
| Susquehanna International Group, Llp | 0.01% | 485,030 | $5,121,917 | $4,675,689 | -$446,228 | -8.71% | |
| Millennium Management Llc | 0.00% | 410,609 | $4,336,031 | $3,958,271 | -$377,760 | -8.71% | |
| Morgan Stanley | 0.00% | 317,892 | $3,356,940 | $3,064,479 | -$292,461 | -8.71% | |
| Clutterbuck Capital Management Llc | 1.93% | 300,000 | $3,168,000 | $2,892,000 | -$276,000 | -8.71% | |
| Itau Unibanco Holding S.A. | 0.07% | 180,000 | $3,052,800 | $1,735,200 | -$1,317,600 | -43.16% | |
| Two Sigma Investments, Lp | 0.00% | 286,474 | $3,025,165 | $2,761,609 | -$263,556 | -8.71% | |
| Badgley Phelps Wealth Managers, Llc | 0.06% | 263,556 | $2,783,152 | $2,540,680 | -$242,472 | -8.71% | |
| Citadel Advisors Llc | 0.00% | 260,048 | $2,746,107 | $2,506,863 | -$239,244 | -8.71% | |
| Bank Of America Corp | 0.00% | 204,805 | $2,162,741 | $1,974,320 | -$188,421 | -8.71% | |
| Goldman Sachs Group Inc | 0.00% | 202,893 | $2,142,550 | $1,955,889 | -$186,661 | -8.71% | |
| Polar Asset Management Partners Inc. | 0.05% | 200,000 | $2,112,000 | $1,928,000 | -$184,000 | -8.71% | |
| Jump Financial, Llc | 0.03% | 195,824 | $2,067,901 | $1,887,743 | -$180,158 | -8.71% | |
| Wellington Management Group Llp | 0.00% | 187,300 | $1,977,887 | $1,805,572 | -$172,315 | -8.71% | |
| Invesco Ltd. | 0.00% | 180,629 | $1,907,442 | $1,741,264 | -$166,178 | -8.71% | |
| Dimensional Fund Advisors Lp | 0.00% | 179,594 | $1,896,513 | $1,731,286 | -$165,227 | -8.71% | |
| Prosight Management, Lp | 0.30% | 174,800 | $1,845,888 | $1,685,072 | -$160,816 | -8.71% | |
| Bank Of New York Mellon Corp | 0.00% | 166,246 | $1,755,562 | $1,602,611 | -$152,951 | -8.71% | |
| Nuveen, Llc | 0.00% | 154,201 | $1,628,362 | $1,486,498 | -$141,864 | -8.71% | |
| Jane Street Group, Llc | 0.00% | 145,307 | $1,534,442 | $1,400,759 | -$133,683 | -8.71% | |
| Wells Fargo & Company/Mn | 0.00% | 118,343 | $1,249,702 | $1,140,827 | -$108,875 | -8.71% | |
| Ameriprise Financial Inc | 0.00% | 117,948 | $1,245,531 | $1,137,019 | -$108,512 | -8.71% | |
| Ancora Advisors Llc | 0.03% | 115,000 | $1,214,400 | $1,108,600 | -$105,800 | -8.71% | |
| Hightower Advisors, Llc | 0.00% | 110,630 | $1,168,254 | $1,066,473 | -$101,781 | -8.71% | |
| Alliancebernstein L.P. | 0.00% | 66,990 | $1,150,553 | $645,784 | -$504,769 | -43.87% | |
| Rhumbline Advisers | 0.00% | 102,818 | $1,085,747 | $991,166 | -$94,581 | -8.71% | |
| Susquehanna Portfolio Strategies, Llc | 0.01% | 92,759 | $979,535 | $894,197 | -$85,338 | -8.71% | |
| Marshall Wace, Llp | 0.00% | 83,682 | $883,682 | $806,694 | -$76,988 | -8.71% | |
| D. E. Shaw & Co., Inc. | 0.00% | 71,168 | $751,534 | $686,060 | -$65,474 | -8.71% | |
| American Financial Group Inc | 0.25% | 64,113 | $677,033 | $618,049 | -$58,984 | -8.71% | |
| Quantinno Capital Management Lp | 0.00% | 61,541 | $649,873 | $593,255 | -$56,618 | -8.71% | |
| Mindset Wealth Management, Llc | 0.17% | 59,500 | $628,320 | $573,580 | -$54,740 | -8.71% | |
| Mml Investors Services, Llc | 0.00% | 57,675 | $609,048 | $555,987 | -$53,061 | -8.71% | |
| Bnp Paribas Financial Markets | 0.00% | 56,908 | $600,948 | $548,593 | -$52,355 | -8.71% | |
| Deutsche Bank Ag\ | 0.00% | 55,030 | $581,117 | $530,489 | -$50,628 | -8.71% | |
| Coldstream Capital Management Inc | 0.01% | 54,130 | $571,613 | $521,813 | -$49,800 | -8.71% | |
| Brevan Howard Capital Management Lp | 0.01% | 51,163 | $540,281 | $493,211 | -$47,070 | -8.71% | |
| Headlands Technologies Llc | 0.06% | 49,926 | $527,219 | $481,287 | -$45,932 | -8.71% | |
| Nfsg Corp | 0.08% | 47,710 | $503,818 | $459,924 | -$43,894 | -8.71% |
Frequently asked questions about OMER
Who owns the most OMER stock?
The largest holders of OMER are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for OMEROS CORP (OMER).
Is OMER widely held by superinvestors?
Many widely followed stocks like OMER appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly OMER is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.