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
2025 Q2	–	Sell	-3,872	Closed	-$15.7K	–	10071
2025 Q1	$15.7K	Buy	+3,872	New	+$27.2K	﹤0.01%	9165
2024 Q4	–	Sell	-3,478	Closed	-$85.9K	–	9827
2024 Q3	$85.9K	Sell	3,478 -1,484	-30%	-$39.2K	﹤0.01%	9043
2024 Q2	$140K	Buy	4,962 +2,120	+75%	+$68.9K	﹤0.01%	8613
2024 Q1	$116K	Sell	2,842 -7,861	-73%	-$185K	﹤0.01%	8475
2023 Q4	$177K	Buy	10,703 +9,290	+657%	+$162K	﹤0.01%	8303
2023 Q3	$53.5K	Buy	+1,413	New	+$66.9K	﹤0.01%	8133
2023 Q2	–	Sell	-2,354	Closed	-$101K	–	8978
2023 Q1	$101K	Buy	+2,354	New	+$114K	﹤0.01%	8221
2022 Q3	–	Sell	-4,763	Closed	-$312K	–	9946
2022 Q2	$312K	Buy	4,763 +2,291	+93%	+$150K	﹤0.01%	7548
2022 Q1	$181K	Buy	+2,472	New	+$143K	﹤0.01%	9098
2021 Q2	–	Sell	-1,211	Closed	-$362K	–	9975
2021 Q1	$345K	Buy	+1,211	New	+$388K	﹤0.01%	7478

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.