Omeros OMER Institutional Ownership

NASDAQ OMER

$19.11 +0.00 (+0.00%)

As of: Sep 4, 2026 · 11:51 AM EDT

Institutions by Trading Activity

173 Institutions

Increased 108 62.4%

Unchanged 25 14.5%

Reduced 40 23.1%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

50.80%

▲+7.94 pp QoQ

Shares Held by Institutions

36.64Mn

of 72.13Mn outstanding

▲+23.65% QoQ

Shares Outstanding

72.13Mn

35.49Mn held outside 13F filers

Institutional Investors

173

filed 13F for Jun 2026

▲+13 vs prior quarter

Net Shares Added (QoQ)

+7.01Mn

accumulated since last quarter

Value of Holdings

$700.20Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Omeros Corp (NASDAQ:OMER) has 173 institutional investors that have filed 13F reports for the period ending June 2026.

These investors collectively held 50.8% of Omeros's outstanding shares in June 2026, up from 42.9% in March 2026.
They increased total shares held in Omeros by 23.65% from last quarter, and the number of investors in OMER increased 37.3% annually.
Of these 173 holders, 108 added to their stakes in Omeros, 40 trimmed positions, and 25 made no changes.
In total, institutional investors held 36.64Mn shares in Omeros as of June 2026, up by 7.01Mn shares quarter on quarter, and up 7.58Mn shares year over year.
BlackRock, Inc. holds the largest position in OMER at 6.04Mn shares as of June 30, 2026, or 8.38% of shares outstanding.
The largest buyers of Omeros for the quarter ending June 2026 were UBS Group AG (807.65K), BlackRock, Inc. (735.01K), Rock Springs Capital Management LP (718.5K), Rubric Capital Management LP (656.87K), Sixth Street Partners Management Company, L.P. (604.63K).
The biggest sellers of Omeros for the quarter ending June 2026 included CITADEL ADVISORS LLC (174.45K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (159.84K), Corient Private Wealth LP (141.68K), JANE STREET GROUP, LLC (125.14K), MILLENNIUM MANAGEMENT LLC (66.77K).
Omeros's 10 largest shareholders as of June 2026 include BlackRock, Inc. (6.04Mn), INGALLS & SNYDER LLC (3.66Mn), UBS Group AG (3.15Mn), VANGUARD CAPITAL MANAGEMENT LLC (3.07Mn), State Street Corp (2.32Mn), GEODE CAPITAL MANAGEMENT, LLC (1.91Mn), Stifel Financial Corp (1.84Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (962.83K), Invesco Ltd. (751.77K), Northern Trust Corp (727.35K) per Business Quant data.

Form 13F Holdings

173 Institutional Holders

Report period 30 Jun, 2026

Total shares held 36.64Mn

Of outstanding 50.80%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	6,044,633	8.38%	▲735,007	+13.84%	$57.48Mn
2	INGALLS & SNYDER LLC	0001041885	3,659,523	5.07%	▲100,100	+2.81%	$34.80K
3	UBS Group AG	0001610520	3,148,384	4.36%	▲807,653	+34.50%	$29.94Mn
4	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	3,072,050	4.26%	▲88,791	+2.98%	$29.22Mn
5	State Street Corp	0000093751	2,319,906	3.22%	▲400,331	+20.86%	$22.06Mn
6	GEODE CAPITAL MANAGEMENT, LLC	0001214717	1,914,460	2.65%	▲162,137	+9.25%	$18.21Mn
7	Stifel Financial Corp	0000720672	1,836,925	2.55%	▲5,340	+0.29%	$17.47Mn
8	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	962,828	1.33%	▲244,153	+33.97%	$9.16Mn
9	Invesco Ltd.	0000914208	751,771	1.04%	▲571,142	+316.20%	$7.15Mn
10	Northern Trust Corp	0000073124	727,348	1.01%	▲163,481	+28.99%	$6.92Mn
11	Rock Springs Capital Management LP	0001595725	718,499	1.00%	▲718,499	0.00%	$6.83Mn
12	Corient Private Wealth LP	0001948780	659,730	0.91%	▼141,681	-17.68%	$6.27Mn
13	Rubric Capital Management LP	0001687509	656,874	0.91%	▲656,874	0.00%	$6.25Mn
14	Sixth Street Partners Management Company, L.P.	0001812095	604,633	0.84%	▲604,633	0.00%	$5.75Mn
14	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0000884546	604,633	0.84%	▲22,121	+3.80%	$5.75Mn
15	Bank Of Montreal /Can/	0000927971	568,424	0.79%	▼2	0.00%	$5.41Mn
16	VANGUARD FIDUCIARY TRUST CO	0000933478	491,173	0.68%	▼1,172	-0.24%	$4.67Mn
17	Federated Hermes, Inc.	0001056288	478,290	0.66%	▲478,290	0.00%	$4.55Mn
18	Clutterbuck Capital Management LLC	0001517638	450,000	0.62%	▲150,000	+50.00%	$4.28Mn
19	TWO SIGMA INVESTMENTS, LP	0001179392	402,662	0.56%	▲116,188	+40.56%	$3.83Mn

Showing 1 to 20 of 173 holders