Omeros Ownership | Who Owns Omeros?


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Omeros Ownership Summary


Omeros is owned by 38.47% institutional investors, 2.79% insiders, and 58.75% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 7.64% of OMER shares. Vanguard US Total Market Shares ETF is the top mutual fund, with 3.24% of its assets in Omeros shares.

OMER Ownership Benchmark


TypeName% Inst% Insiders% Retail
StockOmeros38.47%2.79%58.75%
SectorHealthcare Stocks 232.01%10.74%-142.75%
IndustryBiotech Stocks 381.47%10.55%-292.02%

Institutional Shareholders


Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Blackrock funding, inc. /de5.06M7.64%$86.95M
Ingalls & snyder4.11M7.01%$16.84M
Blackrock4.10M6.98%$16.65M
Vanguard group4.01M6.06%$68.93M
Ubs group2.22M3.35%$38.18M
D. e. shaw1.84M3.17%$18.17M
Stifel financial1.81M2.73%$31.08M
Polar asset management partners1.50M2.56%$6.14M
Geode capital management1.63M2.46%$28.03M
State street1.24M2.12%$5.08M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Ingalls & snyder4.11M0.55%$16.84M
American financial group64.11K0.40%$1.10M
Eam investors207.48K0.40%$3.56M
Mindset wealth management52.00K0.23%$893.10K
Axq capital, lp29.15K0.11%$500.67K
Breakwater investment management17.05K0.11%$292.80K
Newbridge financial services group34.31K0.09%$589.27K
Caitong asset management1.93K0.09%$33.20K
Badgley phelps wealth managers263.56K0.08%$4.53M
Stordahl capital management22.86K0.08%$392.62K

Top Buyers

HolderShares% AssetsChange
Ubs group2.22M0.01%1.51M
Polar asset management partners1.50M0.07%1.50M
Vanguard group4.01M0.00%666.36K
Blackrock funding, inc. /de5.06M0.00%610.28K
Nomura747.28K0.01%430.93K

Top Sellers

HolderShares% AssetsChange
Morgan stanley386.15K0.00%-1.60M
Marshall wace, llp---464.18K
Jpmorgan chase37.19K--378.96K
Renaissance---344.50K
Cormorant asset management, lp---300.00K

New Positions

HolderShares% AssetsChangeValue
Polar asset management partners1.50M0.07%1.50M$6.14M
Eam investors207.48K0.40%207.48K$3.56M
Itau unibanco180.00K0.07%180.00K$3.05M
Dimensional fund advisors lp96.95K0.00%96.95K$1.67M
Verition fund management63.49K0.00%63.49K$1.09M

Sold Out

HolderChange
Newedge advisors-2.00
Nelson, van denburg & campbell wealth management group-11.00
Geowealth management-15.00
Clearstead advisors-26.00
Ameritas advisory services-31.00

Institutional Ownership Trends


DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Dec 31, 2025112-24.83%25,489,475-22.41%381.22%62-18.42%21-32.26%
Sep 30, 20251456.62%32,822,86812.91%562.23%7417.46%30-16.67%
Jun 30, 2025135-9.40%29,054,0605.39%502.22%6410.34%34-34.62%
Mar 31, 20252-98.58%315,252-98.81%-0.03%1-98.80%1-96.15%
Dec 31, 202449-58.47%13,849,257-44.67%231.28%28-36.36%9-73.53%

Top Mutual Funds Shareholders


HolderShares% HoldingChange
Vanguard US Total Market Shares ETF1.88M3.24%-
Vanguard Total Stock Mkt Idx Inv2.10M2.96%69.40K
iShares Russell 2000 ETF1.61M2.27%1.61M
Vanguard Institutional Extnd Mkt Idx Tr769.21K1.08%3.32K
Fidelity Small Cap Index658.26K0.93%7.91K
iShares Russell 2000 Growth ETF494.28K0.70%287.78K
State St Russell Sm/Mid Cp® Indx NL Cl C351.77K0.60%1.59K
iShares Russell 2000 Value ETF339.15K0.58%-
State St Russell Sm/Mid Cp® Indx SL Cl I395.77K0.56%-
Fidelity Extended Market Index373.59K0.53%-7.33K

Recent Insider Transactions


DateNameRoleActivityValue
Jan 13, 2026Borges David J. VP, Finance & CAOSell$369.31K
Jan 12, 2026Borges David J. VP, Finance & CAOSell$381.60K
Nov 17, 2023Demopulos Gregory A MD Chairman, CEO & PresidentBuy$25.20K
Nov 15, 2023Demopulos Peter A MD-Buy$15.30K
May 22, 2023HANISH ARNOLD C-Sell$32.30K

Insider Transactions Trends


DateBuySell
2026 Q1-2
2025 Q4--
2025 Q2--
2024 Q2--
2023 Q42-

OMER Ownership FAQ


Who Owns Omeros?

Omeros shareholders are primarily institutional investors at 38.47%, followed by 2.79% insiders and 58.74% retail investors. The average institutional ownership in Omeros's industry, Biotech Stocks , is 381.47%, which Omeros falls below.

Who owns the most shares of Omeros?

Omeros’s largest shareholders are Blackrock funding, inc. /de (5.06M shares, 7.64%), Ingalls & snyder (4.11M shares, 7.01%), and Blackrock (4.1M shares, 6.98%). Together, they hold 21.62% of Omeros’s total shares outstanding.

Does Blackrock own Omeros?

Yes, BlackRock owns 6.98% of Omeros, totaling 4.1M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 16.65M$. In the last quarter, BlackRock decreased its holdings by -110K shares, a -2.60% change.

Who is Omeros’s biggest shareholder by percentage of total assets invested?

Ingalls & snyder is Omeros’s biggest shareholder by percentage of total assets invested, with 0.55% of its assets in 4.11M Omeros shares, valued at 16.84M$.

Who is the top mutual fund holder of Omeros shares?

Vanguard US Total Market Shares ETF is the top mutual fund holder of Omeros shares, with 3.24% of its total shares outstanding invested in 1.88M Omeros shares.

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