Gossamer Bio, Inc.

GOSSNASDAQ

$10.71-0.22 (-2.01%)as of Oct 2, 2026

Legend

Insider buy

Insider sell

Congress buy

Congress sell

Hedge Funds
bought vs soldGreener markers show more buyers; redder markers show more sellers.

Company share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size.

Insider buy
Insider sell
Congress buy
Congress sell
Hedge Funds bought vs sold

Share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size. Greener fund markers mean more buyers.

Insider Buy
Insider Sell
Congress Buy
Congress Sell
Hedge funds bought vs sold
BuybackNo changeNet dilution

Gossamer Bio, Inc. price and activity chart data

Showing the 1Y range: Oct 2, 2025 to Oct 2, 2026. Price (-94.6%). 0 insider or congressional trades plotted in this window as 0 markers; nearby trades of the same kind are grouped.

Transactions plotted on the price chart
Date	Category	Person	Role	Action	Amount	Change in holding

Largest institutional holders

13F · Q2 2026

Fund	% of company held	Value	% of portfolio	Quarterly activity
D. E. Shaw & Co., Inc.	8.38%	$6.74M	0.00%	Not reported
683 Capital Management, LLC	8.02%	$6.45M	0.32%	Add 683.98%
DeepCurrents Investment Group LLC	7.70%	$6.03M	0.18%	New Not reported
Context Capital Management, LLC	5.92%	$4.76M	0.09%	Not reported
Worth Venture Partners, LLC	5.12%	$4.12M	9.29%	Not reported
Kalehua Capital Management LLC	4.56%	$3.67M	1.17%	Add 25.92%
AQR Capital Management LLC	3.20%	$2.57M	0.00%	Not reported
Gsa Capital Partners LLP	3.07%	$2.47M	0.16%	Not reported
Wolverine Asset Management LLC	2.64%	$2.12M	0.02%	Not reported
Renaissance Technologies LLC	2.38%	$1.91M	0.00%	Not reported
Vanguard Capital Management LLC	1.93%	$1.55M	0.00%	Not reported
ARCH Venture Management, LLC	1.65%	$1.33M	0.12%	Not reported
Barclays PLC	1.60%	$1.29M	0.00%	Not reported
Octagon Capital Advisors LP	1.59%	$1.28M	0.11%	Not reported
BlackRock, Inc.	1.57%	$1.26M	0.00%	Not reported
Arrowstreet Capital, Limited Partnership	1.55%	$1.25M	0.00%	Not reported
Two Sigma Investments, LP	1.52%	$1.22M	0.00%	Not reported
Samsara Biocapital, LLC	1.48%	$1.19M	0.10%	Not reported
Qube Research & Technologies Ltd	1.45%	$1.16M	0.00%	Not reported
Corient Private Wealth LP	1.15%	$927K	0.00%	Not reported
Siren, L.L.C.	1.07%	$857K	0.02%	Not reported
HHLR Advisors, Ltd.	1.02%	$819K	0.10%	Not reported
UBS Group AG	0.63%	$510K	0.00%	Not reported
Squarepoint Ops LLC	0.52%	$421K	0.00%	Not reported
Geode Capital Management, LLC	0.51%	$409K	0.00%	Not reported
Millennium Management LLC	0.49%	$395K	0.00%	Not reported
MB Generational Wealth, LLC	0.45%	$365K	0.18%	Add 44.73%
Jacobs Levy Equity Management, Inc	0.45%	$360K	0.00%	Not reported
Marshall Wace, LLP	0.43%	$338K	0.00%	Not reported
Alyeska Investment Group, L.P.	0.42%	$338K	0.00%	Not reported
Acadian Asset Management LLC	0.37%	$293K	0.00%	Not reported
Ensign Peak Advisors, Inc	0.30%	$239K	0.00%	Reduce 14.75%
Vanguard Fiduciary Trust Co	0.25%	$205K	0.00%	Not reported
JPMorgan Chase & Co	0.25%	$201K	0.00%	Not reported
Goldman Sachs Group Inc	0.23%	$186K	0.00%	Not reported
State Street Corp	0.23%	$183K	0.00%	Not reported
Deutsche Bank Ag\	0.23%	$188K	0.00%	Not reported
Hennion & Walsh Asset Management, Inc.	0.22%	$181K	0.01%	Add 32.60%
NEA Management Company, LLC	0.20%	$165K	0.01%	Not reported
Charles Schwab Investment Management Inc	0.20%	$163K	0.00%	Not reported
Smith, Moore & Co.	0.18%	$148K	0.01%	Add 91.49%
Ishara Investments LP	0.17%	$135K	0.10%	Not reported
Panagora Asset Management Inc	0.15%	$121K	0.00%	Not reported
Mariner, LLC	0.12%	$97.9K	0.00%	Not reported
Ieq Capital, LLC	0.12%	$97.3K	0.00%	Not reported
Vanguard Portfolio Management LLC	0.11%	$89.8K	0.00%	Not reported
Choreo, LLC	0.11%	$88.9K	0.00%	Add 115.95%
Tudor Investment Corp Et Al	0.10%	$78.9K	0.00%	Not reported
Virtu Financial LLC	0.09%	$76K	0.00%	Not reported
Northern Trust Corp	0.09%	$75.5K	0.00%	Not reported

50 of 163 holders

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