Gossamer Bio, Inc. (GOSS) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

226,320,290Shares Outstanding

41,921,482Shares held by institutions

$90,131,186Value of institutional holdings

80.59%Institutional ownership %

2.36%Shares Changed QoQ

186No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Gossamer Bio, Inc. (NASDAQ:GOSS) currently has 186 active institutional owners and shareholders as of today (December 2025), that have filed 13F forms with the Securities Exchange Commission (SEC).

These investors collectively held 80.6% of the company's total shares outstanding in December 2025, down from 81.3% in September 2025.
Quarterly data indicates a 2.36% shift in institutional share volume, and the annual owner count reflects an increase of 78.85%.
Of these 186 institutional investors, 110 increased their holdings in Gossamer Bio, while 49 of them reduced positions, and 27 investors maintained their exposure.
This class of investors increased its holdings in Gossamer Bio to 182.38Mn shares for the 13F-cycle ending December 2025, up by 4.21Mn shares quarter on quarter, and up 11.86Mn shares year over year.
The top institutional stake in Gossamer Bio as of December 31, 2025 belongs to NEA Management Company, LLC, which owns 18.09Mn shares, or 7.99% of the company.
Among the most significant buyers of Gossamer Bio during December 2025 were STATE STREET CORP (5.43Mn), BlackRock, Inc. (3.21Mn), GOLDMAN SACHS GROUP INC (1.49Mn), TWO SIGMA INVESTMENTS, LP (1.11Mn), Samsara BioCapital, LLC (1.09Mn).
Leading sellers of Gossamer Bio stock in December 2025 included Octagon Capital Advisors LP (3.13Mn), SILVERARC CAPITAL MANAGEMENT, LLC (2.64Mn), RENAISSANCE TECHNOLOGIES LLC (2.32Mn), Caption Management, LLC (2.29Mn), CITADEL ADVISORS LLC (1.58Mn).
The top 10 institutional holders of Gossamer Bio for the quarter ending December 2025 included NEA Management Company, LLC (18.09Mn), BlackRock, Inc. (17.06Mn), Octagon Capital Advisors LP (13.92Mn), VANGUARD GROUP INC (12.87Mn), STATE STREET CORP (9.31Mn), ARCH Venture Management, LLC (8.06Mn), Samsara BioCapital, LLC (7.22Mn), 683 Capital Management, LLC (5.49Mn), Siren, L.L.C. (5.21Mn), HHLR ADVISORS, LTD. (4.97Mn).

186 Institutional Holders

41,921,482 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
NEA Management Company, LLC	31 Dec, 2025	18,093,034	0	0.00%	$56,088,405.00
BlackRock, Inc.	31 Dec, 2025	17,056,878	3,210,824	23.19%	$52,876,322.00
Octagon Capital Advisors LP	31 Dec, 2025	13,915,371	-3,134,629	-18.38%	$43,137,650.00
VANGUARD GROUP INC	31 Dec, 2025	12,873,209	863,436	7.19%	$39,906,948.00
STATE STREET CORP	31 Dec, 2025	9,310,969	5,427,302	139.75%	$28,864,004.00
ARCH Venture Management, LLC	31 Dec, 2025	8,055,916	0	0.00%	$24,973,340.00
Samsara BioCapital, LLC	31 Dec, 2025	7,222,559	1,092,291	17.82%	$22,389,933.00
683 Capital Management, LLC	31 Dec, 2025	5,490,900	131,600	2.46%	$17,021,790.00
Siren, L.L.C.	31 Dec, 2025	5,208,968	0	0.00%	$16,147,801.00
HHLR ADVISORS, LTD.	31 Dec, 2025	4,974,041	0	0.00%	$15,419,527.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	4,872,714	183,183	3.91%	$15,109,345.00
Palo Alto Investors LP	31 Dec, 2025	4,471,592	-992,757	-18.17%	$13,861,935.00
ACADIAN ASSET MANAGEMENT LLC	31 Dec, 2025	4,416,903	-596,066	-11.89%	$13,687.00
FMR LLC	31 Dec, 2025	4,237,590	152,244	3.73%	$13,136,529.00
MILLENNIUM MANAGEMENT LLC	31 Dec, 2025	3,584,288	-35,041	-0.97%	$11,111,293.00
TWO SIGMA INVESTMENTS, LP	31 Dec, 2025	3,397,110	1,109,859	48.52%	$10,531,041.00
Rock Springs Capital Management LP	31 Dec, 2025	3,266,960	0	0.00%	$10,127,576.00
PERCEPTIVE ADVISORS LLC	31 Dec, 2025	3,139,669	-673,128	-17.65%	$9,732,974.00
Opaleye Management Inc.	31 Dec, 2025	2,720,000	-5,000	-0.18%	$8,432,000.00
TWO SIGMA ADVISERS, LP	31 Dec, 2025	2,596,900	726,800	38.86%	$8,050,390.00

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