Gossamer Bio, Inc. (GOSS) Institutional Ownership

Ownership Summary

A total of 163 institutions have reported a stake in Gossamer Bio, Inc. (NASDAQ:GOSS) as of September 2025, according to recent 13F filings with the SEC.

• These investors collectively held 81.0% of the company's total shares outstanding in September 2025, up from 78.3% in June 2025.
• Institutional share ownership changed by 1.90% QoQ, while the number of institutional owners saw an increase of 64.65% YoY.
• During the quarter, 90 institutions bought more Gossamer Bio shares, 57 sold shares, and 16 of the 163 total investors held their position steady.
• Collectively, institutional investors increased their stake in Gossamer Bio to 184.09Mn shares as of September 2025, a change that is up by 3.42Mn shares quarter on quarter and up 9.72Mn shares year over year.
• The top institutional stake in Gossamer Bio as of September 30, 2025 belongs to NEA Management Company, LLC, which owns 18.09Mn shares, or 7.96% of the company.
• Among the most significant buyers of Gossamer Bio during September 2025 were PERCEPTIVE ADVISORS LLC (3.81Mn), MILLENNIUM MANAGEMENT LLC (3.12Mn), BANK OF AMERICA CORP /DE/ (2.81Mn), UBS Group AG (2.46Mn), Caption Management, LLC (2.17Mn).
• Leading sellers of Gossamer Bio stock in September 2025 included Corient Private Wealth LLC (3.67Mn), FMR LLC (3.23Mn), Stonepine Capital Management, LLC (3.13Mn), Alyeska Investment Group, L.P. (2.55Mn), Monaco Asset Management SAM (2.17Mn).
• The top 10 institutional holders of Gossamer Bio for the quarter ending September 2025 included NEA Management Company, LLC (18.09Mn), Octagon Capital Advisors LP (17.05Mn), BlackRock, Inc. (13.85Mn), VANGUARD GROUP INC (12.01Mn), ARCH Venture Management, LLC (8.06Mn), Samsara BioCapital, LLC (6.13Mn), Palo Alto Investors LP (5.46Mn), 683 Capital Management, LLC (5.36Mn), Siren, L.L.C. (5.21Mn), ACADIAN ASSET MANAGEMENT LLC (5.01Mn).