6CM
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683 Capital Management’s Gossamer Bio GOSS Stock Holding History

683 Capital Management’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
2026
Q1 		– Sell
-300,100
Closed -$930K – 247
2025
Q4 		$930K Hold
300,100
– – 0.04% 146
2025
Q3 		$789K Hold
300,100
– – 0.04% 122
2025
Q2 		$369K Buy
+300,100
New +$327K 0.02% 123

Other funds holding GOSS

BlackRock
BlackRock New York $5.72T AUM 30.48% 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
SL
Siren LLC Greenwich, Connecticut $3.61B AUM 203.3% 1-Year Est. Return

683 Capital Management's GOSS Position: Q1 2026 in Review

683 Capital Management reduced its Gossamer Bio (GOSS) stake by 3.7% in Q1 2026, selling an estimated $300K and leaving 5,000,000 shares worth $1.64M. The position accounts for 0.09% of the portfolio, ranked #121.

683 Capital Management first reported a position in GOSS in Q3 2023 and has held it in 11 quarters since. The position peaked at $16.1M in Q4 2025. 184 funds tracked by Wall St. Rank hold GOSS as of Q1 2026.

  • 683 Capital Management held 5,000,000 shares of Gossamer Bio worth $1.64M as of Q1 2026.
  • 683 Capital Management sold 190,800 Gossamer Bio shares in Q1 2026, an estimated $300K.
  • Gossamer Bio made up 0.09% of 683 Capital Management's portfolio in Q1 2026, its #121 holding.
  • 683 Capital Management first reported a position in Gossamer Bio in Q3 2023 and has held it in 11 quarters since.
  • 683 Capital Management's Gossamer Bio position peaked at $16.1M in Q4 2025.
  • 184 funds tracked by Wall St. Rank held Gossamer Bio as of Q1 2026.

Based on 683 Capital Management's 13F filing for Q1 2026, filed 15 May 2026.