Antoinette Paone - 15 Apr 2024 Form 4 Insider Report for Generation Bio Co. (GBIO)

Role: CHIEF OPERATING OFFICER
Signature: /s/ Benjamin Waters, Attorney-in-Fact
Issuer symbol: GBIO
Transactions as of: 15 Apr 2024
Net transactions value: -$1,732
Form type: 4
Filing time: 17 Apr 2024, 17:10:18 UTC
Previous filing: 17 Jan 2024
Next filing: 03 Jul 2024
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		+1,592	+13%		14,275	15 Apr 2024	Direct	F1
transaction	GBIO	Common Stock	Tax liability	$1,732	-468	-3.3%	$3.70	13,807	15 Apr 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	-1,592	-8.3%	$0.000000	17,508	15 Apr 2024	Common Stock	1,592		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	On January 20, 2023, the reporting person was granted 25,467 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.