Rock Springs Capital Management’s Gossamer Bio GOSS Stock Holding History

Rock Springs 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 Q2	–	Sell	-20,119	Closed	-$529K	–	111
2026 Q1	$529K	Sell	20,119 -20,718	-51%	-$2.6M	0.03%	97
2025 Q4	$10.1M	Hold	40,837	–	–	0.52%	53
2025 Q3	$8.59M	Hold	40,837	–	–	0.5%	55
2025 Q2	$4.02M	Hold	40,837	–	–	0.25%	68
2025 Q1	$3.59M	Hold	40,837	–	–	0.21%	70
2024 Q4	$2.96M	Hold	40,837	–	–	0.11%	87
2024 Q3	$3.22M	Hold	40,837	–	–	0.1%	92
2024 Q2	$2.94M	Hold	40,837	–	–	0.09%	95
2024 Q1	$3.86M	Hold	40,837	–	–	0.1%	97
2023 Q4	$2.98M	Hold	40,837	–	–	0.07%	91
2023 Q3	$2.72M	Buy	40,837 +27,084	+197%	+$2.5M	0.07%	93
2023 Q2	$1.32M	Hold	13,753	–	–	0.03%	112
2023 Q1	$1.39M	Buy	13,753 +9,052	+193%	+$1.39M	0.03%	110
2022 Q4	$816K	Sell	4,701 -15,136	-76%	-$9.97M	0.02%	115
2022 Q3	$19M	Buy	+19,837	New	+$19.7M	0.49%	56

Other funds holding GOSS

D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return

6CM

683 Capital Management New York $2.04B AUM 94.26% 1-Year Est. Return

DeepCurrents Investment Group New York $3.3B AUM 12.57% 1-Year Est. Return

Context Capital Management Lajolla, California $5.15B AUM 1.28% 1-Year Est. Return

WVP

Worth Venture Partners Fort Lee, New Jersey $44.3M AUM 34.55% 1-Year Est. Return

AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return

GCP

GSA Capital Partners London, United Kingdom $1.59B AUM 39.81% 1-Year Est. Return

Wolverine Asset Management Chicago, Illinois $11.4B AUM 5.65% 1-Year Est. Return

Renaissance Technologies New York $72.6B AUM 54.88% 1-Year Est. Return

KCM

Kalehua Capital Management Dallas, Texas $174M AUM

Rock Springs Capital Management's GOSS Position: Q2 2026 in Review

Rock Springs Capital Management sold out of Gossamer Bio (GOSS) in Q2 2026, closing a stake of 20,119 shares — an estimated $529K sold.

Rock Springs Capital Management first reported a position in GOSS in Q3 2022 and held it in 15 quarters. The position peaked at $19M in Q3 2022. 166 funds tracked by Wall St. Rank hold GOSS as of Q2 2026.

Rock Springs Capital Management reported no remaining Gossamer Bio position as of Q2 2026 after selling out during the quarter.
Rock Springs Capital Management sold 20,119 Gossamer Bio shares in Q2 2026, an estimated $529K.
Rock Springs Capital Management first reported a position in Gossamer Bio in Q3 2022 and held it in 15 quarters.
Rock Springs Capital Management's Gossamer Bio position peaked at $19M in Q3 2022.
166 funds tracked by Wall St. Rank held Gossamer Bio as of Q2 2026.

Based on Rock Springs Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.