Omeros Ownership | Who Owns Omeros?

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Omeros Ownership Summary

Omeros is owned by 50.81% institutional investors, 3.56% insiders, and 45.64% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 8.40% 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	50.81%	3.56%	45.64%
Sector	Healthcare Stocks	244.59%	12.11%	-156.70%
Industry	Biotech Stocks	379.61%	11.70%	-291.31%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	6.04M	8.40%	$57.48M
Blackrock	4.10M	6.98%	$16.65M
Vanguard group	4.01M	6.06%	$68.93M
Ingalls & snyder	3.66M	5.09%	$34.80M
Ubs group	3.15M	4.38%	$29.94M
Vanguard capital management	3.07M	4.27%	$29.22M
State street	2.32M	3.23%	$22.06M
Geode capital management	1.91M	2.66%	$18.21M
Stifel financial	1.84M	2.55%	$17.47M
Invesco	751.77K	1.05%	$7.15M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Ingalls & snyder	3.66M	0.95%	$34.80M
Rock springs capital management lp	718.50K	0.33%	$6.83M
Virtus investment advisers	133.13K	0.29%	$1.27M
American financial group	64.11K	0.21%	$609.72K
Optimize financial	38.41K	0.20%	$405.58K
Mindset wealth management	70.60K	0.13%	$671.41K
Quest partners	82.60K	0.08%	$1.42M
Rubric capital management lp	656.87K	0.06%	$6.25M
Breakwater investment management	17.05K	0.06%	$162.13K
Newbridge financial services group	46.21K	0.05%	$439.46K

Top Buyers

Holder	Shares	% Assets	Change
Ubs group	3.15M	0.00%	807.65K
Blackrock funding, inc. /de	6.04M	0.00%	735.01K
Rock springs capital management lp	718.50K	0.33%	718.50K
Vanguard group	4.01M	0.00%	666.36K
Rubric capital management lp	656.87K	0.06%	656.87K

Top Sellers

Holder	Shares	% Assets	Change
Renaissance	-	-	-344.50K
Cormorant asset management, lp	-	-	-300.00K
Eam investors	-	-	-207.48K
Polar asset management partners	-	-	-200.00K
Jump financial	-	-	-195.82K

New Positions

Holder	Shares	% Assets	Change	Value
Rock springs capital management lp	718.50K	0.33%	718.50K	$6.83M
Rubric capital management lp	656.87K	0.06%	656.87K	$6.25M
Sixth street partners management company	604.63K	0.00%	604.63K	$5.75M
Federated hermes	478.29K	0.01%	478.29K	$4.55M
Swiss national bank	137.30K	0.00%	137.30K	$1.31M

Sold Out

Holder	Change
Transamerica financial advisors	-5.00
Nelson, van denburg & campbell wealth management group	-11.00
Mai capital management	-13.00
Geowealth management	-15.00
Clearstead advisors	-26.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	183	6.40%	36,537,790	17.76%	50	2.13%	109	10.10%	38	-2.56%
Mar 31, 2026	80	-55.06%	10,810,909	-67.47%	17	0.68%	47	-53.00%	13	-62.86%
Dec 31, 2025	112	-24.83%	25,489,475	-22.41%	38	1.22%	62	-18.42%	21	-32.26%
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%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard US Total Market Shares ETF	1.88M	3.24%	-
Vanguard MStar Total Stk Mkt Idx Invest	2.17M	3.01%	-
Vanguard Morn Total Stk Mkt Idx Investor	2.17M	3.00%	52.00K
Vanguard Total Stock Mkt Idx Inv	2.17M	3.00%	52.00K
iShares Russell 2000 ETF	1.84M	2.54%	-32.64K
Vanguard Institutional Extnd Mkt Idx Tr	832.42K	1.15%	1.42K
State Street® SPDR® S&P® PhrmctlsETF	726.64K	1.00%	-
Fidelity Small Cap Index	682.36K	0.94%	3.68K
Invesco Biotechnology & Genome ETF	601.24K	0.83%	-
Russell 2000 Equity Index Fund B	479.23K	0.66%	62.43K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Aug 28, 2026	Cancelmo Peter B	VP, General Counsel	Sell	$466.13K
Aug 31, 2026	Cancelmo Peter B	VP, General Counsel	Sell	$463.54K
Aug 27, 2026	HANISH ARNOLD C	-	Sell	$95.08K
Aug 27, 2026	HANISH ARNOLD C	-	Sell	$94.38K
Aug 26, 2026	HANISH ARNOLD C	-	Sell	$92.63K

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	-	9
2026 Q2	-	1
2026 Q1	-	2
2025 Q4	-	-
2025 Q2	-	-

OMER Ownership FAQ

Who Owns Omeros?

Omeros shareholders are primarily institutional investors at 50.81%, followed by 3.56% insiders and 45.63% retail investors. The average institutional ownership in Omeros's industry, Biotech Stocks , is 379.61%, which Omeros falls below.

Who owns the most shares of Omeros?

Omeros’s largest shareholders are Blackrock funding, inc. /de (6.04M shares, 8.40%), Blackrock (4.1M shares, 6.98%), and Vanguard group (4.01M shares, 6.06%). Together, they hold 21.44% 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 0.95% of its assets in 3.66M Omeros shares, valued at 34.8M$.

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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