Omeros Ownership | Who Owns Omeros?

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Omeros Ownership Summary

Omeros is owned by 56.03% institutional investors, 2.79% insiders, and 41.19% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 7.60% 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	56.03%	2.79%	41.19%
Sector	Healthcare Stocks	42.51%	10.81%	46.68%
Industry	Biotech Stocks	45.22%	10.75%	44.04%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	4.45M	7.60%	$18.25M
Ingalls & snyder	4.11M	7.01%	$16.84M
Blackrock	4.10M	6.98%	$16.65M
Vanguard group	3.35M	5.71%	$13.72M
Morgan stanley	1.99M	3.40%	$8.16M
D. e. shaw	1.84M	3.17%	$18.17M
Stifel financial	1.81M	3.09%	$7.43M
Geode capital management	1.54M	2.62%	$6.30M
Polar asset management partners	1.50M	2.56%	$6.14M
State street	1.24M	2.12%	$5.08M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Ingalls & snyder	4.11M	0.55%	$16.84M
American financial group	64.11K	0.10%	$262.86K
Newbridge financial services group	134.51K	0.08%	$551.49K
Polar asset management partners	1.50M	0.07%	$6.14M
Mindset wealth management	60.00K	0.07%	$246.00K
Breakwater investment management	17.05K	0.03%	$69.90K
Badgley phelps wealth managers	263.56K	0.02%	$1.08M
Cypress capital group	42.00K	0.02%	$172.20K
Stordahl capital management	22.86K	0.02%	$93.73K
Skopos labs	49.20K	0.02%	$157.43K

Top Buyers

Holder	Shares	% Assets	Change
Polar asset management partners	1.50M	0.07%	1.50M
Morgan stanley	1.99M	0.00%	634.17K
Nomura	747.28K	0.01%	430.93K
Blackrock funding, inc. /de	4.45M	0.00%	401.18K
Jpmorgan chase	416.15K	0.00%	384.17K

Top Sellers

Holder	Shares	% Assets	Change
Deepcurrents investment group	120.92K	0.01%	-407.21K
Cormorant asset management, lp	-	-	-300.00K
Marshall wace, llp	464.18K	0.00%	-277.20K
First trust advisors lp	-	-	-162.80K
Ubs group	709.09K	0.00%	-159.41K

New Positions

Holder	Shares	% Assets	Change	Value
Polar asset management partners	1.50M	0.07%	1.50M	$6.14M
Quadrature capital	21.53K	0.00%	21.53K	$88.18K
Quantinno capital management lp	18.21K	0.00%	18.21K	$74.65K
Srs capital advisors	3.36K	0.00%	3.36K	$13.78K
Strategic investment solutions, inc. /il	1.82K	0.01%	1.82K	$18.03K

Sold Out

Holder	Change
Newedge advisors	-2.00
Nelson, van denburg & campbell wealth management group	-11.00
Geowealth management	-15.00
Ameritas advisory services	-31.00
Capital performance advisors llp	-36.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Sep 30, 2025	145	6.62%	32,822,868	12.91%	56	2.23%	74	17.46%	30	-16.67%
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	-

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 56.03%, followed by 2.79% insiders and 41.18% retail investors. The average institutional ownership in Omeros's industry, Biotech Stocks , is 45.22%, which Omeros exceeds.

Who owns the most shares of Omeros?

Omeros’s largest shareholders are Blackrock funding, inc. /de (4.45M shares, 7.60%), Ingalls & snyder (4.11M shares, 7.01%), and Blackrock (4.1M shares, 6.98%). Together, they hold 21.58% 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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