Institutional shares held 33.1 Million
2.2M calls
2.72M puts
Total value of holdings $245M
$16.3M calls
$20.2M puts
Market Cap $465M
62,730,000 Shares Out.
Institutional ownership 52.79%
# of Institutions 154


Latest Institutional Activity in OMER

Top Purchases

Q3 2025
Polar Asset Management Partners Inc. Shares Held: 1.5M ($11.1M)
Q3 2025
Morgan Stanley Shares Held: 1.99M ($14.7M)
Q3 2025
Jpmorgan Chase & CO Shares Held: 416K ($3.08M)
Q3 2025
Stifel Financial Corp Shares Held: 1.81M ($13.4M)
Q3 2025
Two Sigma Investments, LP Shares Held: 933K ($6.92M)

Top Sells

Q3 2025
D. E. Shaw & Co., Inc. Shares Held: 1.01M ($7.45M)
Q3 2025
Deep Currents Investment Group LLC Shares Held: 121K ($896K)
Q3 2025
Marshall Wace, LLP Shares Held: 464K ($3.44M)
Q3 2025
Ubs Group Ag Shares Held: 709K ($5.25M)
Q3 2025
Graham Capital Management, L.P. Shares Held: 34.5K ($255K)

About OMER

Omeros Corporation, a commercial-stage biopharmaceutical company, discovers, develops, and commercializes small-molecule and protein therapeutics, and orphan indications targeting inflammation, complement-mediated diseases, cancers related to dysfunction of the immune system, and addictive and compulsive disorders. The company's clinical programs include Narsoplimab (OMS721/MASP-2) that has completed pivotal studies for hematopoietic stem-cell transplant-associated thrombotic microangiopathy (HSCT-TMA); that is in Phase III clinical trial for immunoglobulin A nephropathy (IgAN) and atypical hemolytic uremic syndrome (aHUS); and Phase II clinical trial to treat COVID-19. Its clinical programs also consist of PPAR? (OMS405) that is in Phase II to treat opioid and nicotine addiction; PDE7 (OMS527), which is in Phase I trial for treating addiction and compulsive disorders, and movement disorders; and MASP-3 (OMS906) that is in Phase I trial for paroxysmal nocturnal hemoglobinuria (PNH) and other alternative pathway disorders. The company's preclinical programs comprise MASP-2-small-molecule inhibitors used for the treatment of aHUS, IgAN, HSCT-TMA, and age-related macular degeneration; longer-acting second generation antibody targeting MASP-2; and MASP-3-small-molecule inhibitors to treat PNH and other alternative pathway disorders. Its preclinical programs also include GPR174 Inhibitors and Chimeric Antigen Receptor (CAR) T-Cell and Adoptive T-Cell Therapies for various cancers; and G protein-coupled receptor targets for treating immunologic, immuno-oncologic, metabolic, CNS, cardiovascular, musculoskeletal, and other disorders. The company was incorporated in 1994 and is headquartered in Seattle, Washington.


Insider Transactions at OMER

Insider Transaction List

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Date Insider Transaction Ownership Type Shares Traded Value / Price
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Last 12 Months Summary

Buy / Acquisition
600K Shares
From 1 Insiders
Bona fide gift 600K shares
Sell / Disposition
600K Shares
From 1 Insiders
Bona fide gift 600K shares

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