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Gossamer Bio
GOSS

Overview Fund Activity

123 hedge funds and large institutions have $218M invested in Gossamer Bio in 2025 Q2 according to their latest regulatory filings, with 33 funds opening new positions, 40 increasing their positions, 25 reducing their positions, and 29 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
123
Holders Change
+4
Holders Change %
+3.36%
% of All Funds
1.65%
Holding in Top 10
2
Holding in Top 10 Change
-1
Holding in Top 10 Change %
-33.33%
% of All Funds
0.03%
New
33
Increased
40
Reduced
25
Closed
29
Calls
$4.37M
Puts
$222K
Net Calls
+$4.15M
Net Calls Change
+$1.33M

Top Buyers

1
BlackRock
1
BlackRock
New York
$14.9M
2
Geode Capital Management
2
Geode Capital Management
Massachusetts
$5.6M
3
State Street
3
State Street
Massachusetts
$3.05M
4
Vanguard Group
4
Vanguard Group
Pennsylvania
$14M
5
Renaissance Technologies
5
Renaissance Technologies
New York
$3.36M

Top Sellers

1
Susquehanna International Group
1
Susquehanna International Group
Pennsylvania
$471K
2
EP
2
Eversept Partners
New York
$2.09M
3
Millennium Management
3
Millennium Management
New York
$610K
4
Marshall Wace
4
Marshall Wace
United Kingdom
$0
5
MAM
5
Monaco Asset Management
Monaco
$4.37M
Name Holding Trade Value Shares
Change 		Shares
Change %
OCA
1
Octagon Capital Advisors
New York
$22.6M – – –
NMC
2
NEA Management Company
Maryland
$22.3M – – –
BlackRock
3
BlackRock
New York
$14.9M +$11.2M +9,069,823 +295%
Vanguard Group
4
Vanguard Group
Pennsylvania
$14M +$1.63M +1,326,911 +13%
AVM
5
Arch Venture Management
Illinois
$9.91M – – –
Fidelity Investments
6
Fidelity Investments
Massachusetts
$9M -$342K -277,655 -4%
Acadian Asset Management
7
Acadian Asset Management
Massachusetts
$8.79M +$969K +787,909 +12%
6CM
8
683 Capital Management
New York
$7.8M +$295K +240,000 +4%
SB
9
Samsara BioCapital
California
$7.54M – – –
PAI
10
Palo Alto Investors
California
$7.06M -$662K -537,880 -9%
SL
11
Siren LLC
Connecticut
$6.41M – – –
SCM
12
Silverarc Capital Management
Massachusetts
$6.33M -$1.44M -1,173,902 -19%
HA
13
HHLR Advisors
Cayman Islands
$6.12M – – –
Geode Capital Management
14
Geode Capital Management
Massachusetts
$5.6M +$2.81M +2,282,632 +100%
Alyeska Investment Group
15
Alyeska Investment Group
Illinois
$5.48M +$363K +295,353 +7%
Corient Private Wealth
16
Corient Private Wealth
Florida
$4.54M +$372K +302,200 +9%
MAM
17
Monaco Asset Management
Monaco
$4.37M -$1.6M -1,299,134 -27%
OM
18
Opaleye Management
Massachusetts
$4.36M -$913K -742,415 -17%
RSCM
19
Rock Springs Capital Management
Maryland
$4.02M – – –
Renaissance Technologies
20
Renaissance Technologies
New York
$3.36M +$1.43M +1,163,139 +74%
State Street
21
State Street
Massachusetts
$3.05M +$1.97M +1,598,730 +181%
Deutsche Bank
22
Deutsche Bank
Germany
$2.78M +$183K +148,710 +7%
Two Sigma Investments
23
Two Sigma Investments
New York
$2.15M +$578K +469,715 +37%
EP
24
Eversept Partners
New York
$2.09M -$2.71M -2,201,079 -56%
Two Sigma Advisers
25
Two Sigma Advisers
New York
$2.06M +$474K +385,000 +30%
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