Omeros Corp: which funds bought and sold

Institutions that bought and sold Omeros shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 100 institutions that filed 13F reports for both quarters added to or opened positions in Omeros, and 67 cut or closed them. Together they added a net 5.2M shares, +16.9% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 1.8M shares (+100.2%); index fund managers were net buyers of 1.8M shares (+12.7%). 33 opened a new position and 25 sold out entirely.

Bought, Q2 2026 100 institutions, 33 of them new holders Sold, Q2 2026 67 institutions, 25 of them sold out

Net change, all compared +5.2M shares (+16.9%)

Net change, active managers +1.8M shares (+100.2%), 12 bought, 11 sold

Buyers versus sellers

institutions compared, 193

100 bought 26 67 sold

Active managers and hedge funds 12 bought · 11 sold · +1.8M

Index fund managers 9 bought · 2 sold · +1.8M

Other institutions 79 bought · 54 sold · +1.6M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
UBS Group AG	+808K +34.5%	3.1M	$29.9M
Blackrock, Inc. Index funds	+735K +13.8%	6.0M	$57.5M
Rock Springs Capital Management LP Hedge fund	+718K New position	718K	$6.8M
Rubric Capital Management LP Hedge fund	+657K New position	657K	$6.2M
Invesco Ltd.	+571K +316.2%	752K	$7.1M
Federated Hermes, Inc. Active manager	+478K New position	478K	$4.5M
State Street Corp Index funds	+400K +20.9%	2.3M	$22.1M
Vanguard Portfolio Management LLC Index funds	+244K +34.0%	963K	$9.2M
Northern Trust Corp Index funds	+163K +29.0%	727K	$6.9M
Geode Capital Management, LLC Index funds	+162K +9.3%	1.9M	$18.2M
Clutterbuck Capital Management LLC	+150K +50.0%	450K	$4.3M
Swiss National Bank	+137K New position	137K	$1.3M
Caption Management, LLC	+130K New position	130K	$1.2M
Two Sigma Investments, LP Hedge fund	+116K +40.6%	403K	$3.8M
Virtus Investment Advisers, LLC	+106K +395.5%	133K	$1.3M
Ingalls & Snyder LLC	+100K +2.8%	3.7M	$34.8M
Cambridge Investment Research Advisors, Inc.	+96K +108.7%	185K	$1.8M
Vanguard Capital Management LLC Index funds	+89K +3.0%	3.1M	$29.2M
Morgan Stanley	+77K +24.1%	394K	$3.8M
Jupiter Asset Management Ltd Active manager	+76K New position	76K	$724,529

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Rock Springs Capital Management LP Hedge fund	+718K New position	718K	$6.8M
Rubric Capital Management LP Hedge fund	+657K New position	657K	$6.2M
Federated Hermes, Inc. Active manager	+478K New position	478K	$4.5M
Two Sigma Investments, LP Hedge fund	+116K +40.6%	403K	$3.8M
Jupiter Asset Management Ltd Active manager	+76K New position	76K	$724,529
Squarepoint Ops LLC Hedge fund	+55K New position	55K	$523,335
Balyasny Asset Management L.P. Hedge fund	+54K +187.3%	84K	$794,637
Brevan Howard Capital Management LP Hedge fund	+47K +91.6%	98K	$932,427
Price T Rowe Associates Inc Active manager	+22K +20.7%	130K	$1.2M
Wellington Management Group LLP Active manager	+17K +9.2%	205K	$1.9M

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Polar Asset Management Partners Inc.	−200K Sold out	0	—
Jump Financial, LLC	−196K Sold out	0	—
Dimensional Fund Advisors LP	−180K Sold out	0	—
Prosight Management, LP	−175K Sold out	0	—
Citadel Advisors LLC Hedge fund	−174K −67.1%	86K	$813,999
Susquehanna International Group, LLP	−160K −33.0%	325K	$3.1M
Corient Private Wealth LP	−142K −17.7%	660K	$6.3M
Jane Street Group, LLC	−125K −86.1%	20K	$191,779
Marshall Wace, LLP Hedge fund	−84K Sold out	0	—
D. E. Shaw & Co., Inc. Hedge fund	−71K Sold out	0	—
Millennium Management LLC Hedge fund	−67K −16.3%	344K	$3.3M
Susquehanna Portfolio Strategies, LLC	−51K −55.0%	42K	$397,090
Goldman Sachs Group Inc	−46K −22.6%	157K	$1.5M
BNP Paribas Financial Markets	−43K −76.3%	13K	$128,242
Nomura Holdings Inc	−38K Sold out	0	—
Walleye Capital LLC Hedge fund	−34K −98.9%	374	$3,557
Acadian Asset Management LLC Active manager	−33K Sold out	0	—
Simplex Trading, LLC	−29K −76.4%	8,859	$84,249
Vontobel Holding Ltd.	−28K Sold out	0	—
Gsa Capital Partners LLP	−24K Sold out	0	—

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Citadel Advisors LLC Hedge fund	−174K −67.1%	86K	$813,999
Marshall Wace, LLP Hedge fund	−84K Sold out	0	—
D. E. Shaw & Co., Inc. Hedge fund	−71K Sold out	0	—
Millennium Management LLC Hedge fund	−67K −16.3%	344K	$3.3M
Walleye Capital LLC Hedge fund	−34K −98.9%	374	$3,557
Acadian Asset Management LLC Active manager	−33K Sold out	0	—
Farallon Capital Management, L.L.C. Hedge fund	−23K Sold out	0	—
LMR Partners LLP Hedge fund	−11K Sold out	0	—
Quantbot Technologies LP Hedge fund	−3,650 Sold out	0	—
FMR LLC Active manager	−3,034 −16.2%	16K	$148,762

New positions

largest by value

Institution	Shares	Value June 30, 2026
Rock Springs Capital Management LPHedge fund	718K	$6.8M
Rubric Capital Management LPHedge fund	657K	$6.2M
Federated Hermes, Inc.Active manager	478K	$4.5M
Swiss National Bank	137K	$1.3M
Caption Management, LLC	130K	$1.2M
Jupiter Asset Management LtdActive manager	76K	$724,529
Squarepoint Ops LLCHedge fund	55K	$523,335
Vanguard Asset Management, Ltd	48K	$454,283
Atom Investors LP	24K	$227,717
State Of New Jersey Common Pension Fund D	22K	$210,314

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Polar Asset Management Partners Inc.	200K	$2.1M
Jump Financial, LLC	196K	$2.1M
Dimensional Fund Advisors LP	180K	$1.9M
Prosight Management, LP	175K	$1.8M
Marshall Wace, LLPHedge fund	84K	$883,682
D. E. Shaw & Co., Inc.Hedge fund	71K	$751,534
Nomura Holdings Inc	38K	$403,783
Acadian Asset Management LLCActive manager	33K	$345,000
Vontobel Holding Ltd.	28K	$300,432
Gsa Capital Partners LLP	24K	$253,000

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 171
Ten largest holders: 67.6%
Index fund managers: 45.0%
Active managers and hedge funds: 9.7%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	12	11	6	6	+1.8M	+100.2%
Index fund managers	9	2	0	0	+1.8M	+12.7%
Other institutions	79	54	27	19	+1.6M	+11.1%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Omeros.

Only managers that filed a holdings report for both quarters are compared (193 here). 4 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

← Back to Omeros Corp · Insiders · Politicians