Mariner’s Generation Bio GBIO Stock Holding History

Mariner’s Portfolio GBIO Stock Details GBIO Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q3	–	Sell	-1,229	Closed	-$3.94K	–	3643
2025 Q2	$3.94K	Buy	+1,229	New	+$4.73K	﹤0.01%	3464

Other funds holding GBIO

AVLSA

Atlas Venture Life Science Advisors Cambridge, Massachusetts $790M AUM 223.66% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return

Renaissance Technologies New York $63.9B AUM 45.56% 1-Year Est. Return

Siren LLC Greenwich, Connecticut $3.61B AUM 203.3% 1-Year Est. Return

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return

BBA

Baker Bros. Advisors New York $17.4B AUM 131.5% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return

Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return

Mariner's GBIO Position: Q3 2025 in Review

Mariner sold out of Generation Bio (GBIO) in Q3 2025, closing a stake of 1,229 shares — an estimated $3.94K sold.

Mariner first reported a position in GBIO in Q2 2025 and held it in 1 quarter. The position peaked at $3.94K in Q2 2025. 41 funds tracked by Wall St. Rank hold GBIO as of Q3 2025.

Mariner reported no remaining Generation Bio position as of Q3 2025 after selling out during the quarter.
Mariner sold 1,229 Generation Bio shares in Q3 2025, an estimated $3.94K.
Mariner first reported a position in Generation Bio in Q2 2025 and held it in 1 quarter.
Mariner's Generation Bio position peaked at $3.94K in Q2 2025.
41 funds tracked by Wall St. Rank held Generation Bio as of Q3 2025.

Based on Mariner's 13F filing for Q3 2025, filed 14 Nov 2025.