Kevin John Conway - Apr 15, 2025 Form 4 Insider Report for Generation Bio Co. (GBIO)

Role: Chief Financial Officer
Signature: /s/ Shawna-Gay White, Attorney-in-Fact
Stock symbol: GBIO
Transactions as of: Apr 15, 2025
Transactions value $: -$64
Form type: 4
Date filed: 4/17/2025, 04:05 PM
Previous filing: Jan 17, 2025
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	GBIO	Common Stock	Options Exercise		+587	+3.36%		18K	Apr 15, 2025	Direct	F1
transaction	GBIO	Common Stock	Tax liability	-$64	-173	-0.96%	$0.37	17.9K	Apr 15, 2025	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	GBIO	Restricted Stock Units	Options Exercise	$0	-587	-12.51%	$0.00	4.11K	Apr 15, 2025	Common Stock	587		Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each restricted stock unit represents the right to receive one share of the company's common stock.
F2	The grant of 9,390 restricted stock units was made on January 20, 2023. The shares underlying the restricted stock units vest over four years, with 25% of the shares vested on January 15, 2024 and the remaining shares vesting in equal quarterly installments thereafter.