Jane Street’s Generation Bio GBIO Stock Holding History

Jane Street’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
2022 Q1	–	Sell	-1,280	Closed	-$91K	–	10540
2021 Q4	$91K	Buy	+1,280	New	+$223K	﹤0.01%	9296
2021 Q3	–	Sell	-840	Closed	-$226K	–	10205
2021 Q2	$226K	Buy	+840	New	+$251K	﹤0.01%	8634

Other funds holding GBIO

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

AVLSA

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

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

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

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

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

BBA

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

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

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

Jane Street's GBIO Position: Q2 2025 in Review

Jane Street sold out of Generation Bio (GBIO) in Q2 2025, closing a stake of 3,872 shares — an estimated $15.7K sold.

Jane Street first reported a position in GBIO in Q1 2021 and held it in 10 quarters. The position peaked at $345K in Q1 2021. 61 funds tracked by Wall St. Rank hold GBIO as of Q2 2025.

Jane Street reported no remaining Generation Bio position as of Q2 2025 after selling out during the quarter.
Jane Street sold 3,872 Generation Bio shares in Q2 2025, an estimated $15.7K.
Jane Street first reported a position in Generation Bio in Q1 2021 and held it in 10 quarters.
Jane Street's Generation Bio position peaked at $345K in Q1 2021.
61 funds tracked by Wall St. Rank held Generation Bio as of Q2 2025.

Based on Jane Street's 13F filing for Q2 2025, filed 14 Aug 2025.