Omeros Ownership | Who Owns Omeros?

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Omeros Ownership Summary

Omeros is owned by 50.04% institutional investors, 3.79% insiders, and 46.17% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 6.98% 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

Type	Name	% Inst	% Insiders	% Retail
Stock	Omeros	50.04%	3.79%	46.17%
Sector	Healthcare Stocks	487.91%	11.08%	-398.99%
Industry	Biotech Stocks	307.10%	11.11%	-218.21%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	4.05M	6.98%	$12.15M
Blackrock	4.10M	6.98%	$16.65M
Ingalls & snyder	3.98M	6.86%	$11.95M
Vanguard group	3.14M	5.42%	$31.04M
D. e. shaw	1.84M	3.17%	$18.17M
Stifel financial	1.58M	2.73%	$15.62M
Geode capital management	1.34M	2.31%	$13.24M
State street	1.22M	2.08%	$4.96M
Ubs group	849.19K	1.47%	$8.39M
Nomura	747.28K	1.29%	$7.38M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Ingalls & snyder	3.98M	0.42%	$11.95M
Corton capital	38.97K	0.14%	$116.90K
American financial group	64.11K	0.07%	$192.34K
Quest partners	28.89K	0.04%	$285.47K
Bridgeway capital management	155.10K	0.03%	$1.53M
Breakwater investment management	17.05K	0.03%	$69.90K
Stordahl capital management	32.66K	0.02%	$97.97K
Skopos labs	49.20K	0.02%	$147.59K
Spc financial	19.40K	0.02%	$191.67K
Stifel financial	1.58M	0.02%	$15.62M

Top Buyers

Holder	Shares	% Assets	Change
Nomura	747.28K	0.01%	430.93K
Ubs group	849.19K	0.00%	399.11K
D. e. shaw	1.84M	0.01%	233.66K
Millennium management	315.25K	0.00%	229.58K
Susquehanna portfolio strategies	142.06K	0.01%	142.06K

Top Sellers

Holder	Shares	% Assets	Change
Blackrock funding, inc. /de	4.05M	0.00%	-332.14K
Stifel financial	1.58M	0.02%	-323.00K
Cormorant asset management, lp	-	-	-300.00K
First trust advisors lp	-	-	-162.80K
Badgley phelps wealth managers	121.44K	0.01%	-124.30K

New Positions

Holder	Shares	% Assets	Change	Value
Susquehanna portfolio strategies	142.06K	0.01%	142.06K	$426.17K
Brevan howard capital management lp	105.30K	0.00%	105.30K	$315.90K
Skopos labs	49.20K	0.02%	49.20K	$147.59K
Corton capital	38.97K	0.14%	38.97K	$116.90K
Quest partners	28.89K	0.04%	28.89K	$285.47K

Sold Out

Holder	Change
Newedge advisors	-2.00
Nelson, van denburg & campbell wealth management group	-11.00
Geowealth management	-15.00
Capital performance advisors llp	-36.00
Rothschild investment	-60.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2025	135	-9.40%	29,054,060	5.39%	50	2.22%	64	10.34%	34	-34.62%
Mar 31, 2025	2	-98.58%	315,252	-98.81%	-	0.03%	1	-98.80%	1	-96.15%
Dec 31, 2024	49	-58.47%	13,849,257	-44.67%	23	1.28%	28	-36.36%	9	-73.53%
Sep 30, 2024	117	3.54%	25,017,088	0.26%	43	2.40%	44	10.00%	34	-
Jun 30, 2024	113	6.60%	24,952,412	-1.93%	42	2.58%	40	-9.09%	34	6.25%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard US Total Market Shares ETF	1.88M	3.24%	-
Vanguard Total Stock Mkt Idx Inv	1.70M	2.53%	-37.39K
iShares Russell 2000 ETF	1.40M	2.05%	-
Vanguard Institutional Extnd Mkt Idx Tr	643.82K	0.96%	-293.37K
Fidelity Small Cap Index	564.65K	0.84%	-877.00
iShares Russell 2000 Growth ETF	433.04K	0.64%	-
State St Russell Sm/Mid Cp® Indx NL Cl C	351.77K	0.60%	1.59K
iShares Russell 2000 Value ETF	339.15K	0.58%	-
State St Russell Sm/Mid Cp® Indx SL Cl I	351.77K	0.52%	-
Fidelity Extended Market Index	312.46K	0.46%	-2.57K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Nov 17, 2023	Demopulos Gregory A MD	Chairman, CEO & President	Buy	$25.20K
Nov 15, 2023	Demopulos Peter A MD	-	Buy	$15.30K
May 22, 2023	HANISH ARNOLD C	-	Sell	$32.30K
May 22, 2023	Cable Thomas J.	-	Sell	$32.65K
Jun 15, 2021	Demopulos Gregory A MD	CHAIRMAN, CEO & PRESIDENT	Sell	$553.58K

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	-
2025 Q2	-	-
2024 Q2	-	-
2023 Q4	2	-
2023 Q3	-	-

OMER Ownership FAQ

Who Owns Omeros?

Omeros shareholders are primarily institutional investors at 50.04%, followed by 3.79% insiders and 46.17% retail investors. The average institutional ownership in Omeros's industry, Biotech Stocks , is 307.10%, which Omeros falls below.

Who owns the most shares of Omeros?

Omeros’s largest shareholders are Blackrock funding, inc. /de (4.05M shares, 6.98%), Blackrock (4.1M shares, 6.98%), and Ingalls & snyder (3.98M shares, 6.86%). Together, they hold 20.81% 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 0.42% of its assets in 3.98M Omeros shares, valued at 11.95M$.

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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