Mariner
GOSS icon

Mariner’s Gossamer Bio GOSS Stock Holding History

Mariner’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 		$137K Buy
418,404
+353,954
+549% +$556K ﹤0.01% 3263
2025
Q4 		$200K Buy
64,450
+41,981
+187% +$120K ﹤0.01% 3172
2025
Q3 		$59.1K Buy
+22,469
New +$49.5K ﹤0.01% 3429
2020
Q4 		– Sell
-23,960
Closed -$297K – 792
2020
Q3 		$297K Buy
23,960
+400
+2% +$5.3K ﹤0.01% 672
2020
Q2 		$306K Buy
+23,560
New +$296K ﹤0.01% 672

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

Mariner's GOSS Position: Q1 2026 in Review

Mariner increased its Gossamer Bio (GOSS) stake by 549% in Q1 2026, buying an estimated $556K and bringing the position to 418,404 shares worth $137K. The position accounts for ﹤0.01% of the portfolio, ranked #3263.

Mariner first reported a position in GOSS in Q2 2020 and has held it in 5 quarters since. The position peaked at $306K in Q2 2020. 184 funds tracked by Wall St. Rank hold GOSS as of Q1 2026.

  • Mariner held 418,404 shares of Gossamer Bio worth $137K as of Q1 2026.
  • Mariner bought 353,954 Gossamer Bio shares in Q1 2026, an estimated $556K.
  • Gossamer Bio made up ﹤0.01% of Mariner's portfolio in Q1 2026, its #3263 holding.
  • Mariner first reported a position in Gossamer Bio in Q2 2020 and has held it in 5 quarters since.
  • Mariner's Gossamer Bio position peaked at $306K in Q2 2020.
  • 184 funds tracked by Wall St. Rank held Gossamer Bio as of Q1 2026.

Based on Mariner's 13F filing for Q1 2026, filed 13 May 2026.