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Siren LLC’s Gossamer Bio GOSS Stock Holding History

Siren LLC’s Portfolio GOSS Stock Details GOSS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q1 		– Sell
-207,000
Closed -$187K – 124
2024
Q4 		$187K Hold
207,000
– – 0.01% 117
2024
Q3 		$204K Buy
+207,000
New +$199K 0.01% 111

Other funds holding GOSS

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
KCM
Kalehua Capital Management Dallas, Texas $141M AUM
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $218B AUM 29.41% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
AVM
Arch Venture Management Chicago, Illinois $677M AUM 322.07% 1-Year Est. Return
OCA
Octagon Capital Advisors New York $904M AUM 737.04% 1-Year Est. Return
SB
Samsara BioCapital Palo Alto, California $1.03B AUM 214.94% 1-Year Est. Return
Balyasny Asset Management
Balyasny Asset Management Chicago, Illinois $77.1B AUM 42.89% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return
6CM
683 Capital Management New York $1.92B AUM 85.52% 1-Year Est. Return

Siren LLC's GOSS Position: Q1 2026 in Review

Siren LLC held its Gossamer Bio (GOSS) position steady in Q1 2026 at 5,208,968 shares worth $1.71M. The position accounts for 0.05% of the portfolio, ranked #91.

Siren LLC first reported a position in GOSS in Q3 2024 and has held it in 7 quarters since. The position peaked at $16.1M in Q4 2025. 185 funds tracked by Wall St. Rank hold GOSS as of Q1 2026.

  • Siren LLC held 5,208,968 shares of Gossamer Bio worth $1.71M as of Q1 2026.
  • Siren LLC left its Gossamer Bio share count unchanged in Q1 2026.
  • Gossamer Bio made up 0.05% of Siren LLC's portfolio in Q1 2026, its #91 holding.
  • Siren LLC first reported a position in Gossamer Bio in Q3 2024 and has held it in 7 quarters since.
  • Siren LLC's Gossamer Bio position peaked at $16.1M in Q4 2025.
  • 185 funds tracked by Wall St. Rank held Gossamer Bio as of Q1 2026.

Based on Siren LLC's 13F filing for Q1 2026, filed 14 May 2026.