Antoinette Paone - Aug 23, 2023 Form 4 Insider Report for Generation Bio Co. (GBIO)

Role: CHIEF OPERATING OFFICER
Signature: /s/ Benjamin Waters, Attorney-in-Fact
Stock symbol: GBIO
Transactions as of: Aug 23, 2023
Transactions value $: -$15,362
Form type: 4
Date filed: 8/25/2023, 05:35 PM
Previous filing: Jul 18, 2023
Next filing: Oct 17, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	GBIO	Common Stock	Sale	-$15.4K	-3.12K	-51.67%	$4.93	2.91K	Aug 23, 2023	Direct	F1

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

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id	Content
F1	These transactions were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on April 24, 2023.