Phillip Samayoa - Jul 15, 2024 Form 4 Insider Report for Generation Bio Co. (GBIO)

Role: CHIEF STRATEGY OFFICER
Signature: /s/ Shawna-Gay White
Stock symbol: GBIO
Transactions as of: Jul 15, 2024
Transactions value $: -$987
Form type: 4
Date filed: 7/17/2024, 04:05 PM
Previous filing: Apr 17, 2024

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	GBIO	Common Stock	Options Exercise		+1.15K	+0.95%		122K	Jul 15, 2024	Direct	F1, F2
transaction	GBIO	Common Stock	Tax liability	-$987	-337	-0.28%	$2.93	121K	Jul 15, 2024	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	-1.15K	-9.1%	$0.00	11.5K	Jul 15, 2024	Common Stock	1.15K		Direct	F1, F3

* 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	Includes 6,719 shares acquired under the company's employee stock purchase plan since April 15, 2024.
F3	On January 20, 2023, the reporting person was granted 18,345 restricted stock units. 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.