Gossamer Bio, Inc.

GOSS

Exchange: Nasdaq
Industry: Pharmaceutical Preparations
SEC CIK: 0001728117

SEC filings (opens in a new tab)

No open-market purchases or sales by Gossamer Bio, Inc. insiders were filed in the last 90 days; 170 institutions reported holding it in 13F filings for Q2 2026, worth $60.8M in total; HHLR Advisors (Hillhouse) is the only superinvestor holding it.

Q4 2025 vs. Q3 2025

How the institutions holding Gossamer Bio, Inc. changed between Q3 2025 and Q4 2025.

All holders in Q4 2025 All holders in Q3 2025

13F holders of GOSS: Q3 2025 compared with Q4 2025
Measure	Q3 2025	Of which not filed for Q4 2025	Q4 2025	Change
Holders	164	4	195	+35
Shares	180.1M	216.9K	185.0M	+5.10M (+2.8%)
Value	$473.7M	$565.5K	$573.4M	+$100.3M (+21.2%)

4 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (49)

Institutions that held Gossamer Bio, Inc. at the end of Q4 2025 but not at the end of Q3 2025.

Institutions new to GOSS in Q4 2025
Institution	Shares	Value	% of portfolio
Monashee Investment Management LLC	1,000,000	$3.10M	1.75%
Integral Health Asset Management, LLC	1,000,000	$3.10M	0.16%
HRT Financial LP	956,879	$2.97M	0.01%
Hennion & Walsh Asset Management, Inc.	652,977	$2.02M	0.07%
Algert Global LLC	332,336	$1.03M	0.02%
Rafferty Asset Management, LLC	312,804	$969.7K	0.00%
Squarepoint Ops LLC	221,591	$686.9K	0.00%
Profund Advisors LLC	116,503	$361.2K	0.01%
Lighthouse Investment Partners, LLC	92,500	$286.8K	0.01%
Susquehanna International Group, LLP	88,455	$274.2K	0.00%
VARCOV Co.	83,868	$260.0K	0.10%
CAPROCK Group, Inc.	80,000	$248.0K	0.01%
Caption Management, LLC	75,375	$233.7K	0.01%
Virtus Investment Advisers, Inc.	73,896	$229.1K	0.06%
Engineers Gate Manager LP	51,129	$158.5K	0.00%
China Universal Asset Management Co., Ltd.	47,716	$147.9K	0.01%
Oppenheimer & Co Inc	37,500	$116.3K	0.00%
Vickerman Investment Advisors, Inc.	34,787	$107.8K	0.02%
Cetera Investment Advisers	34,249	$106.2K	0.00%
Mangrove Partners	30,747	$95.3K	0.01%
AlphaCore Capital LLC	26,377	$81.8K	0.00%
State of Wisconsin Investment Board	26,304	$81.5K	0.00%
Nomura Holdings Inc	16,000	$49.6K	0.00%
Eaton Financial Holdings Company, LLC	14,199	$44.0K	0.01%
Hudson Bay Capital Management LP	14,180	$44.0K	0.00%
Gladstone Institutional Advisory LLC	14,170	$43.9K	0.00%
Sherbrooke Park Advisers LLC	13,347	$41.4K	0.11%
O'Shaughnessy Asset Management, LLC	13,107	$40.6K	0.00%
CIBC World Markets Corp	12,712	$39.4K	0.00%
Janney Montgomery Scott LLC	12,700	$39.0K	0.00%
Neuberger Berman Group LLC	12,558	$38.9K	0.00%
Mirae Asset Global Investments Co., Ltd.	11,247	$34.9K	0.00%
Ieq Capital, LLC	11,211	$34.8K	0.00%
Beacon Pointe Advisors, LLC	11,000	$34.1K	0.00%
RMB Capital Management, LLC	10,671	$33.1K	0.00%
NorthCrest Asset Manangement, LLC	11,484	$31.5K	0.00%
Soltis Investment Advisors LLC	10,099	$31.3K	0.00%
Mma Asset Management LLC	10,000	$31.0K	0.01%
GF Fund Management Co. Ltd.	4,547	$14.1K	0.00%
SageView Advisory Group, LLC	4,098	$12.7K	0.00%
Aster Capital Management (DIFC) Ltd	2,100	$6.51K	0.00%
Nisa Investment Advisors, LLC	2,013	$6.24K	0.00%
Heritage Wealth Advisors	1,000	$3.10K	0.00%
Daiwa Securities Group Inc.	771	$2.00K	0.00%
GAMMA Investing LLC	468	$1.45K	0.00%
Cornerstone Financial Management LLC	282	$874	0.00%
Rothschild Investment LLC	253	$784	0.00%
MAI Capital Management	85	$264	0.00%
SJS Investment Consulting Inc.	59	$183	0.00%

Sold out (14)

Institutions that held Gossamer Bio, Inc. at the end of Q3 2025 and filed for Q4 2025 without it.

Institutions that sold out of GOSS in Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
Colony Group, LLC	1,325,198	$3.49M
Eversept Partners, LP	925,233	$2.43M
Tang Capital Management LLC	800,000	$2.10M
Adage Capital Partners GP, L.L.C.	726,800	$1.91M
Woodline Partners LP	495,153	$1.30M
Alps Advisors Inc	99,155	$260.8K
Quadrature Capital Ltd	79,709	$209.2K
Group One Trading, L.P.	74,531	$196.0K
Omers Administration Corp	59,100	$155.4K
DLD Asset Management, LP	37,543	$98.7K
Bank of Nova Scotia	35,000	$92.0K
HSBC Holdings PLC	25,969	$68.2K
Brighton Jones LLC	13,754	$36.2K
GTS Securities LLC	10,627	$27.9K

Not filed for Q4 2025 yet (4)

Institutions that held Gossamer Bio, Inc. at the end of Q3 2025 and haven't filed a 13F for Q4 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding GOSS in Q3 2025 that haven't filed for Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
Cubist Systematic Strategies, LLC	162,785	$428.1K
CIBC Bancorp USA Inc.	20,246	$53.2K
Fullcircle Wealth LLC	22,100	$50.8K
Wolverine Trading, LLC	11,793	$33.3K