OMEROS CORP (OMER) Institutional Ownership Changes & 13F Activity
OMEROS CORP (OMER). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Invesco Ltd., Rock Springs Capital Management Lp, Rubric Capital Management Lp, Citadel Advisors Llc, and Susquehanna International Group, Llp.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Manufacturers Life Insurance Company, The | Buy | +511 | +2.8% | 18,965 | $180.36K | Q2 2026 | Sep 09, 2026 |
| Citadel Advisors Llc | Sell | -174,454 | -67.1% | 85,594 | $814.00K | Q2 2026 | Sep 02, 2026 |
| Corient Private Wealth Llc | Sell | -141,681 | -17.7% | 659,730 | $6.27M | Q2 2026 | Aug 27, 2026 |
| Optimize Financial Inc | Sell | -133 | -0.3% | 38,274 | $363.99K | Q2 2026 | Aug 27, 2026 |
| California State Teachers Retirement System | Buy | +71,978 | +1918.4% | 75,730 | $720.19K | Q2 2026 | Aug 24, 2026 |
| Invesco Ltd. | Buy | +751,771 | — | 751,771 | $7.15M | Q2 2026 | Aug 14, 2026 |
| Rock Springs Capital Management Lp | Buy | +718,499 | — | 718,499 | $6.83M | Q2 2026 | Aug 14, 2026 |
| Rubric Capital Management Lp | Buy | +656,874 | — | 656,874 | $6.25M | Q2 2026 | Aug 14, 2026 |
| Susquehanna International Group, Llp | Sell | -159,836 | -33.0% | 325,194 | $3.09M | Q2 2026 | Aug 14, 2026 |
| Caption Management, Llc | Buy | +130,000 | — | 130,000 | $1.24M | Q2 2026 | Aug 14, 2026 |
| Jane Street Group, Llc | Sell | -125,141 | -86.1% | 20,166 | $191.78K | Q2 2026 | Aug 14, 2026 |
| Ameriprise Financial Inc | Buy | +117,456 | — | 117,456 | $1.12M | Q2 2026 | Aug 14, 2026 |
| Two Sigma Investments, Lp | Buy | +116,188 | +40.6% | 402,662 | $3.83M | Q2 2026 | Aug 14, 2026 |
| Ingalls & Snyder Llc | Buy | +100,100 | +2.8% | 3,659,523 | $34.80M | Q2 2026 | Aug 14, 2026 |
| Millennium Management Llc | Sell | -66,770 | -16.3% | 343,839 | $3.27M | Q2 2026 | Aug 14, 2026 |
| Squarepoint Ops Llc | Buy | +55,030 | — | 55,030 | $523.34K | Q2 2026 | Aug 14, 2026 |
| Balyasny Asset Management L.P. | Buy | +54,475 | +187.3% | 83,558 | $794.64K | Q2 2026 | Aug 14, 2026 |
| Ancora Advisors Llc | Buy | +53,750 | +46.7% | 168,750 | $1.60M | Q2 2026 | Aug 14, 2026 |
| Susquehanna Portfolio Strategies, Llc | Sell | -51,004 | -55.0% | 41,755 | $397.09K | Q2 2026 | Aug 14, 2026 |
| State Of Wisconsin Investment Board | Buy | +48,540 | +411.4% | 60,339 | $573.82K | Q2 2026 | Aug 14, 2026 |
| Brevan Howard Capital Management Lp | Buy | +46,884 | +91.6% | 98,047 | $932.43K | Q2 2026 | Aug 14, 2026 |
| Goldman Sachs Group Inc | Sell | -45,885 | -22.6% | 157,008 | $1.49M | Q2 2026 | Aug 14, 2026 |
| Legal & General Group Plc | Buy | +38,618 | +636.4% | 44,686 | $424.96K | Q2 2026 | Aug 14, 2026 |
| Wells Fargo & Company/Mn | Buy | +38,546 | +32.6% | 156,889 | $1.49M | Q2 2026 | Aug 14, 2026 |
| Coldstream Capital Management Inc | Buy | +30,613 | +56.6% | 84,743 | $805.91K | Q2 2026 | Aug 14, 2026 |
| Atom Investors Lp | Buy | +23,945 | — | 23,945 | $227.72K | Q2 2026 | Aug 14, 2026 |
| Price T Rowe Associates Inc | Buy | +22,257 | +20.7% | 129,550 | $1.23M | Q2 2026 | Aug 14, 2026 |
| Charles Schwab Investment Management Inc | Buy | +22,121 | +3.8% | 604,633 | $5.75M | Q2 2026 | Aug 14, 2026 |
| Group One Trading Llc | Buy | +20,093 | +52.0% | 58,697 | $558.21K | Q2 2026 | Aug 14, 2026 |
| Wellington Management Group Llp | Buy | +17,241 | +9.2% | 204,541 | $1.95M | Q2 2026 | Aug 14, 2026 |
Frequently asked questions about OMER activity
Which institutional owners are buying OMER?
Institutional owners buying OMER include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in OMER activity?
"Buy" means an investor increased their reported position in OMER compared to the prior reporting period. This reflects growing exposure to OMEROS CORP (OMER) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in OMER increasing?
Institutional interest in OMER can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.
Related OMER Institutional Insights
- OMER Overview
- OMER 13F Institutional Holders
- OMER Top Institutional Shareholders
- Healthcare Sector Institutional Ownership
- Healthcare Sector Portfolio Overlap
- Institutional Portfolio Overlap & Shared Holdings
- Most Bought Healthcare Stocks By Institutional Investors
- Most Sold Healthcare Stocks By Institutional Investors
- OMER Insider Trading & SEC Form 4 Activity
- OMER Articles
- Top Institutional Investor Stock Rankings