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Gossamer Bio
GOSS

Overview Fund Activity

119 hedge funds and large institutions have $187M invested in Gossamer Bio in 2025 Q1 according to their latest regulatory filings, with 24 funds opening new positions, 35 increasing their positions, 30 reducing their positions, and 9 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
119
Holders Change
+14
Holders Change %
+13.33%
% of All Funds
1.62%
Holding in Top 10
3
Holding in Top 10 Change
+2
Holding in Top 10 Change %
+200%
% of All Funds
0.04%
New
24
Increased
35
Reduced
30
Closed
9
Calls
$2.93M
Puts
$117K
Net Calls
+$2.82M
Net Calls Change
+$2.31M

Top Buyers

1
Susquehanna International Group
1
Susquehanna International Group
Pennsylvania
$3.21M
2
Acadian Asset Management
2
Acadian Asset Management
Massachusetts
$6.99M
3
Goldman Sachs
3
Goldman Sachs
New York
$1.03M
4
Arrowstreet Capital
4
Arrowstreet Capital
Massachusetts
$884K
5
AI
5
Atom Investors
Texas
$772K

Top Sellers

1
Alyeska Investment Group
1
Alyeska Investment Group
Illinois
$4.58M
2
PIM
2
Platinum Investment Management
Australia
$1.9M
3
Jacobs Levy Equity Management
3
Jacobs Levy Equity Management
New Jersey
$310K
4
EP
4
Eversept Partners
New York
$4.29M
5
Millennium Management
5
Millennium Management
New York
$2.95M
Name Holding Trade Value Shares
Change 		Shares
Change %
OCA
1
Octagon Capital Advisors
New York
$20.2M – – –
NMC
2
NEA Management Company
Maryland
$19.9M – – –
Vanguard Group
3
Vanguard Group
Pennsylvania
$11.1M +$54.7K +49,732 +0.5%
AVM
4
Arch Venture Management
Illinois
$8.78M – – –
Fidelity Investments
5
Fidelity Investments
Massachusetts
$8.35M -$374K -340,020 -4%
Acadian Asset Management
6
Acadian Asset Management
Massachusetts
$6.99M +$1.38M +1,253,353 +25%
SCM
7
Silverarc Capital Management
Massachusetts
$6.95M +$164K +148,837 +2%
PAI
8
Palo Alto Investors
California
$6.9M -$220 -200 -0%
SB
9
Samsara BioCapital
California
$6.74M – – –
6CM
10
683 Capital Management
New York
$6.71M -$963K -875,000 -13%
SL
11
Siren LLC
Connecticut
$5.73M – – –
HA
12
HHLR Advisors
Cayman Islands
$5.47M – – –
MAM
13
Monaco Asset Management
Monaco
$5.33M -$575K -522,507 -10%
OM
14
Opaleye Management
Massachusetts
$4.72M -$223K -202,585 -5%
Alyeska Investment Group
15
Alyeska Investment Group
Illinois
$4.58M -$5.11M -4,644,780 -53%
EP
16
Eversept Partners
New York
$4.29M -$1.19M -1,081,617 -22%
Corient Private Wealth
17
Corient Private Wealth
Florida
$3.73M – – –
RSCM
18
Rock Springs Capital Management
Maryland
$3.59M – – –
BlackRock
19
BlackRock
New York
$3.38M +$47.9K +43,564 +1%
Susquehanna International Group
20
Susquehanna International Group
Pennsylvania
$3.21M +$2.57M +2,338,235 +405%
Millennium Management
21
Millennium Management
New York
$2.95M -$999K -908,031 -25%
Geode Capital Management
22
Geode Capital Management
Massachusetts
$2.5M +$24.2K +21,987 +1%
Deutsche Bank
23
Deutsche Bank
Germany
$2.32M – – –
PIM
24
Platinum Investment Management
Australia
$1.9M -$1.59M -1,448,940 -46%
Marshall Wace
25
Marshall Wace
United Kingdom
$1.89M -$903K -820,723 -32%
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