Omeros Ownership | Who Owns Omeros?

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Omeros Ownership Summary

Omeros is owned by 17.02% institutional investors, 3.56% insiders, and 79.42% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 8.36% 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	17.02%	3.56%	79.42%
Sector	Healthcare Stocks	35.58%	11.87%	52.55%
Industry	Biotech Stocks	35.75%	11.83%	52.41%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	5.31M	8.36%	$56.07M
Blackrock	4.10M	6.98%	$16.65M
Vanguard group	4.01M	6.06%	$68.93M
Ingalls & snyder	3.56M	5.60%	$37.59M
Ubs group	2.34M	3.69%	$24.72M
State street	1.92M	3.02%	$20.27M
Stifel financial	1.83M	2.88%	$19.34M
Geode capital management	1.75M	2.76%	$18.51M
Ci private wealth	801.41K	1.26%	$8.46M
Two sigma advisers, lp	578.20K	0.99%	$2.37M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Ingalls & snyder	3.56M	1.33%	$37.59M
Prosight management, lp	174.80K	0.30%	$1.85M
American financial group	64.11K	0.25%	$677.03K
Optimize financial	38.41K	0.20%	$405.58K
Mindset wealth management	59.50K	0.17%	$628.32K
Nverses capital	14.40K	0.14%	$152.11K
Newbridge financial services group	47.71K	0.08%	$503.82K
Diametric capital, lp	29.32K	0.08%	$309.64K
Quest partners	82.60K	0.08%	$1.42M
Virtus investment advisers	26.86K	0.08%	$283.69K

Top Buyers

Holder	Shares	% Assets	Change
Vanguard group	4.01M	0.00%	666.36K
Vanguard fiduciary trust	492.35K	0.00%	492.35K
State street	1.92M	0.00%	346.05K
Blackrock funding, inc. /de	5.31M	0.00%	247.19K
Prosight management, lp	174.80K	0.30%	174.80K

Top Sellers

Holder	Shares	% Assets	Change
D. e. shaw	71.17K	0.00%	-683.83K
Nomura	38.24K	0.00%	-616.78K
Royal bank of canada	800.00	-	-497.60K
Renaissance	-	-	-344.50K
Jane street group	145.31K	0.00%	-318.31K

New Positions

Holder	Shares	% Assets	Change	Value
Vanguard fiduciary trust	492.35K	0.00%	492.35K	$5.20M
Prosight management, lp	174.80K	0.30%	174.80K	$1.85M
Headlands	49.93K	0.06%	49.93K	$527.22K
Vanguard global advisers	41.12K	0.00%	41.12K	$434.24K
Optimize financial	38.41K	0.20%	38.41K	$405.58K

Sold Out

Holder	Change
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

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Mar 31, 2025	2	-98.58%	315,252	-98.81%	-	0.03%	1	-98.80%	1	-96.15%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard US Total Market Shares ETF	1.88M	3.24%	-
Vanguard Total Stock Mkt Idx Inv	2.12M	2.94%	-
iShares Russell 2000 ETF	1.62M	2.25%	13.68K
Vanguard Institutional Extnd Mkt Idx Tr	798.32K	1.11%	4.11K
Fidelity Small Cap Index	644.94K	0.90%	6.93K
State Street® SPDR® S&P® PhrmctlsETF	533.94K	0.74%	-
iShares Russell 2000 Growth ETF	501.03K	0.70%	1.29K
State St Russell Sm/Mid Cp® Indx NL Cl C	351.77K	0.60%	1.59K
State St Russell Sm/Mid Cp® Indx SL Cl I	422.77K	0.59%	-
iShares Russell 2000 Value ETF	339.15K	0.58%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
May 22, 2026	Cable Thomas J.	-	Sell	$87.04K
Jan 12, 2026	Borges David J.	VP, Finance & CAO	Sell	$381.60K
Jan 13, 2026	Borges David J.	VP, Finance & CAO	Sell	$369.31K
Nov 17, 2023	Demopulos Gregory A MD	Chairman, CEO & President	Buy	$25.20K
Nov 15, 2023	Demopulos Peter A MD	-	Buy	$15.30K

Insider Transactions Trends

Date	Buy	Sell
2026 Q1	-	2
2025 Q4	-	-
2025 Q2	-	-
2024 Q2	-	-
2023 Q4	2	-

OMER Ownership FAQ

Who Owns Omeros?

Omeros shareholders are primarily institutional investors at 17.02%, followed by 3.56% insiders and 79.42% retail investors. The average institutional ownership in Omeros's industry, Biotech Stocks , is 35.75%, which Omeros falls below.

Who owns the most shares of Omeros?

Omeros’s largest shareholders are Blackrock funding, inc. /de (5.31M shares, 8.36%), Blackrock (4.1M shares, 6.98%), and Vanguard group (4.01M shares, 6.06%). Together, they hold 21.39% 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 1.33% of its assets in 3.56M Omeros shares, valued at 37.59M$.

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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