Omeros OMER Institutional Ownership

Updated Oct 11, 2026

Omeros Corp (NASDAQ:OMER) had 172 institutional holders reporting a position on Form 13F for the quarter ended June 30, 2026.

• Together they owned 49.96% of the outstanding stock in Q2 2026, up from 42.81% a quarter earlier.
• Total holdings of OMER shares rose 16.92% from Q1 2026, and the holder count rose 38.71% from Q2 2025.
• Of the 172 holders of OMER in Q2 2026, 107 added to their positions, 40 reduced their stakes and 25 left their positions unchanged.
• In total, institutional investors held 36.04Mn shares of Omeros at the end of Q2 2026, up 5.22Mn from the prior quarter and up 8.44Mn from a year earlier.
• BlackRock, Inc. was the top holder of Omeros as of June 30, 2026, with 6.04Mn shares, or 8.38% of shares outstanding.
• Among holders that already owned Omeros, the biggest buyers in Q2 2026 were UBS Group AG (+807.65K shares), BlackRock, Inc. (+735.01K shares), Invesco Ltd. (+571.14K shares), State Street Corp (+400.33K shares) and Vanguard Portfolio Management LLC (+244.15K shares).
• Among holders that kept a stake in Omeros, the biggest sellers in Q2 2026 were Citadel Advisors LLC (-174.45K shares), Susquehanna International Group, LLP (-159.84K shares), Corient Private Wealth LP (-141.68K shares), Jane Street Group, LLC (-125.14K shares) and Millennium Management LLC (-66.77K shares).
• Business Quant data shows the 10 biggest positions in Omeros as of Q2 2026 were held by BlackRock, Inc. (6.04Mn shares), Ingalls & Snyder LLC (3.66Mn shares), UBS Group AG (3.15Mn shares), Vanguard Capital Management LLC (3.07Mn shares), State Street Corp (2.32Mn shares), Geode Capital Management, LLC (1.91Mn shares), Stifel Financial Corp (1.84Mn shares), Vanguard Portfolio Management LLC (962.83K shares), Invesco Ltd. (751.77K shares) and Northern Trust Corp (727.35K shares).