Siren LLC’s Generation Bio GBIO Stock Holding History

Siren LLC’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
2026 Q1	–	Sell	-201,419	Closed	-$1.14M	–	112
2025 Q4	$1.14M	Sell	201,419 -95,473	-32%	-$539K	0.03%	109
2025 Q3	$1.82M	Sell	296,892 -1	-0%	-$5	0.07%	92
2025 Q2	$950K	Hold	296,893	–	–	0.05%	98
2025 Q1	$1.2M	Sell	296,893 -1,380	-0.5%	-$9.7K	0.07%	96
2024 Q4	$3.16M	Hold	298,273	–	–	0.14%	80
2024 Q3	$7.37M	Buy	+298,273	New	+$7.89M	0.37%	53

Other funds holding GBIO

ACM

Accent Capital Management Centerville, Ohio $231M AUM 33.86% 1-Year Est. Return

Siren LLC's GBIO Position: Q1 2026 in Review

Siren LLC sold out of Generation Bio (GBIO) in Q1 2026, closing a stake of 201,419 shares — an estimated $1.14M sold.

Siren LLC first reported a position in GBIO in Q3 2024 and held it in 6 quarters. The position peaked at $7.37M in Q3 2024. 2 funds tracked by Wall St. Rank hold GBIO as of Q1 2026.

Siren LLC reported no remaining Generation Bio position as of Q1 2026 after selling out during the quarter.
Siren LLC sold 201,419 Generation Bio shares in Q1 2026, an estimated $1.14M.
Siren LLC first reported a position in Generation Bio in Q3 2024 and held it in 6 quarters.
Siren LLC's Generation Bio position peaked at $7.37M in Q3 2024.
2 funds tracked by Wall St. Rank held Generation Bio as of Q1 2026.

Based on Siren LLC's 13F filing for Q1 2026, filed 14 May 2026.