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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1733294	Generation Bio Co.	GBIO	Pharmaceutical Preparations (2834)	814301281

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1946316	Phillip Samayoa	C/O Generation Bio Co. 301 Binney Street, Suite 401 Cambridge MA 02142	Chief Strategy Officer	No	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2024-01-02	2,445	$1.62	107,256	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (right to buy)	Acquisiton	2024-01-02	160,650	$0.00	160,650	$1.86

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
160,650		2034-01-01	No	4	A	Direct

Footnotes

This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 30, 2023.
Includes 2,445 shares acquired under the company's employee stock purchase plan since December 5, 2023.
The option to purchase 160,650 shares of common stock was granted on January 2, 2024. The shares underlying the option vest over four years, with 25% of the shares vesting on January 2, 2025 and the remaining shares vesting in equal quarterly installments thereafter.