Yalonda Howze - Oct 15, 2024 Form 4 Insider Report for Generation Bio Co. (GBIO)

Role: CHIEF LEGAL OFFICER
Signature: /s/ Shawna-Gay White, Attorney-in-Fact
Stock symbol: GBIO
Transactions as of: Oct 15, 2024
Transactions value $: $8,100
Form type: 4
Date filed: 10/17/2024, 04:05 PM
Previous filing: Jul 17, 2024

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	GBIO	Common Stock	Options Exercise	$8.1K	+3.35K	+28.31%	$2.42	15.2K	Oct 15, 2024	Direct
transaction	GBIO	Common Stock	Tax liability		-983	-6.48%		14.2K	Oct 15, 2024	Direct	F1

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	-3.35K	-9.09%	$0.00	33.5K	Oct 15, 2024	Common Stock	3.35K		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 53,550 restricted stock units was made on April 5, 2023. The shares underlying the restricted stock units vest over four years, with 25% of the shares vested on April 15, 2024 and the remaining shares vesting in equal quarterly installments thereafter.