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Insider Trading

Phillip Samayoa - Insider Trading & Ownership

Location: C/O Generation Bio Co., 301 Binney Street, Suite 401, Cambridge, MA
Summary: The estimated net worth of Phillip Samayoa is at least $835K dollars as of October 31, 2025. Phillip Samayoa is the CHIEF SCIENTIFIC OFFICER of Generation Bio Co. and owns shares of Generation Bio Co. (GBIO) stock worth about $835K.
Signature: /s/ Shawna-Gay White, Attorney-in-Fact
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Ownership of Phillip Samayoa

Symbol	Company	Relationship	Holdings Value	Past Year Net Change	Change %	Report Period
GBIO	Generation Bio Co.	Chief Scientific Officer	$835K			Oct 31, 2025

Insider Transactions Reported by Phillip Samayoa:

Sym	Company	Class	Transaction	%	Value $	* Price $	Shares	Shares After	Date	Ownership

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