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

Role: CHIEF LEGAL OFFICER
Signature: /s/ Shawna-Gay White, Attorney-in-Fact
Issuer symbol: GBIO
Transactions as of: 15 Oct 2024
Net transactions value: +$8,100
Form type: 4
Filing time: 17 Oct 2024, 16:05:08 UTC
Previous filing: 17 Jul 2024
Next filing: 14 Jan 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	$8,100	+3,347	+28%	$2.42	15,169	15 Oct 2024	Direct
transaction	GBIO	Common Stock	Tax liability		-983	-6.5%		14,186	15 Oct 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	-3,347	-9.1%	$0.000000	33,468	15 Oct 2024	Common Stock	3,347		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.