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Gossamer Bio
GOSS

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, 41 increasing their positions, 24 reducing their positions, and 28 closing their positions.

New
Increased
Maintained
Reduced
Closed

1,868% more call options, than puts

Call options by funds: $4.37M | Put options by funds: $222K

71% more repeat investments, than reductions

Existing positions increased: 41 | Existing positions reduced: 24

18% more first-time investments, than exits

New positions opened: 33 | Existing positions closed: 28

17% more capital invested

Capital invested by funds: $187M → $218M (+$31.1M)

4% more funds holding

Funds holding: 118 → 123 (+5)

3.14% more ownership

Funds ownership: 74.65% → 77.79% (+3.1%)

33% less funds holding in top 10

Funds holding in top 10: 3 → 2 (-1)

Holders
123
Holders Change
+5
Holders Change %
+4.24%
% of All Funds
1.62%
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
41
Reduced
24
Closed
28
Calls
$4.37M
Puts
$222K
Net Calls
+$4.15M
Net Calls Change
+$1.33M

Top Buyers

Rank Fund Capital Flow
1
BlackRock
BlackRock
New York
+$9.89M
2
Geode Capital Management
Geode Capital Management
Massachusetts
+$2.49M
3
State Street
State Street
Massachusetts
+$1.74M
4
Vanguard Group
Vanguard Group
Pennsylvania
+$1.45M
5
Renaissance Technologies
Renaissance Technologies
New York
+$1.27M

Top Sellers

Rank Fund Capital Flow
1
Susquehanna International Group
Susquehanna International Group
Pennsylvania
-$2.76M
2
EP
Eversept Partners
New York
-$2.4M
3
Millennium Management
Millennium Management
New York
-$2.38M
4
Marshall Wace
Marshall Wace
United Kingdom
-$1.89M
5
MAM
Monaco Asset Management
Monaco
-$1.42M
Name Holding Trade Value Shares
Change 		Change in
Stake
Charles Schwab
26
Charles Schwab
California
$1.99M +$526K +482,472 +42%
Northern Trust
27
Northern Trust
Illinois
$1.87M +$1.21M +1,110,010 +271%
PIM
28
Platinum Investment Management
Australia
$1.7M -$379K -347,492 -20%
LCM
29
Laurion Capital Management
New York
$1.65M -$226K -207,656 -13%
Focus Partners Wealth
30
Focus Partners Wealth
Massachusetts
$1.41M +$491K +450,000 +64%
Arrowstreet Capital
31
Arrowstreet Capital
Massachusetts
$1.38M +$343K +314,157 +39%
EAM
32
Exome Asset Management
New York
$1.35M – – –
Jacobs Levy Equity Management
33
Jacobs Levy Equity Management
New Jersey
$1.34M +$883K +809,300 +287%
SSA
34
Schonfeld Strategic Advisors
New York
$1.1M +$759K +695,673 +345%
DCM
35
DAFNA Capital Management
California
$1.05M -$63.2K -57,933 -6%
Morgan Stanley
36
Morgan Stanley
New York
$1.01M +$392K +359,158 +78%
Citadel Advisors
37
Citadel Advisors
Florida
$944K +$666K +610,629 +389%
GCP
38
GSA Capital Partners
United Kingdom
$935K +$70.8K +64,895 +9%
AI
39
Atom Investors
Texas
$898K +$31K +28,382 +4%
Mackenzie Financial
40
Mackenzie Financial
Ontario, Canada
$680K +$219K +200,591 +57%
HCM
41
Highbridge Capital Management
New York
$612K – – –
Millennium Management
42
Millennium Management
New York
$610K -$2.38M -2,181,788 -81%
WP
43
Woodline Partners
California
$609K -$254K -233,306 -32%
BCM
44
Bridgeway Capital Management
Texas
$598K -$81.8K -75,000 -13%
Ameriprise
45
Ameriprise
Minnesota
$534K +$473K +434,049 New
OCM
46
Opti Capital Management
New York
$509K -$452K -414,152 Closed
Bank of New York Mellon
47
Bank of New York Mellon
New York
$476K +$400K +366,489 +1,813%
Susquehanna International Group
48
Susquehanna International Group
Pennsylvania
$471K -$2.76M -2,533,432 -87%
PCM
49
Prelude Capital Management
New York
$460K -$2.87K -2,633 -0.7%
SAM
50
Silverback Asset Management
North Carolina
$431K +$382K +350,000 New
1
2
3 4 5

GOSS Hedge Fund Activity: Q2 2025 in Review

123 of the 7,595 institutional investors tracked by Wall St. Rank reported a position in Gossamer Bio (GOSS) for Q2 2025, worth a combined $218M — up 17% from $187M a quarter earlier.

Buyers outnumbered sellers: 33 funds opened new GOSS positions and 28 closed out — a net gain of 5 holders — while 41 added to existing stakes and 24 trimmed.

The largest buyer was BlackRock, adding an estimated $9.89M. The largest seller was Susquehanna International Group, cutting an estimated $2.76M.

  • 123 institutional investors held Gossamer Bio (GOSS) as of Q2 2025, up from 118 in Q1 2025.
  • Funds reported $218M of Gossamer Bio stock for Q2 2025, up 17% quarter-over-quarter.
  • 33 funds opened new Gossamer Bio positions in Q2 2025 and 28 closed out, a net change of +5 holders.
  • The largest Gossamer Bio buyer in Q2 2025 was BlackRock, an estimated $9.89M added.
  • The largest Gossamer Bio seller in Q2 2025 was Susquehanna International Group, an estimated $2.76M sold.

Based on aggregated 13F filings for Q2 2025.