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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1733294	Generation Bio Co.	GBIO	()	DE

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1534261	Casdin Capital, Llc	1350 Avenue Of The Americas Suite 2600 New York NY 10019		No	No	Yes	No
1534264	Eli Casdin	1350 Avenue Of The Americas Suite 2600 New York NY 10019		No	No	Yes	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	Acquisiton	2020-06-16	961,215	$0.00	961,215	No	4	C	Indirect	See Footnote
Common Stock	Acquisiton	2020-06-16	650,000	$19.00	1,611,215	No	4	P	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See Footnote
No	4	P	Indirect	See Footnote

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series B Preferred Stock	Disposition	2020-06-16	1,093,410	$0.00	703,331	$0.00
Common Stock	Series C Preferred Stock	Disposition	2020-06-16	455,500	$0.00	257,883	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	C	Indirect
0			No	4	C	Indirect

Footnotes

On June 16, 2020, the Series B Preferred Stock automatically converted into Common Stock on approximately a 1.5546-for-one basis (when rounded to the nearest ten-thousandth) without payment of further consideration upon closing of the initial public offering of the Issuer's common stock. The shares had no expiration date.
On June 16, 2020, the Series C Preferred Stock automatically converted into Common Stock on a 1.7663-for-one basis without payment of further consideration upon closing of the initial public offering of the Issuer's common stock. The shares had no expiration date.
The securities are owned directly by clients of Casdin Capital, LLC and may be deemed to be indirectly beneficially owned by (i) Casdin Capital, LLC as investment adviser to such clients and (ii) Eli Casdin as managing member of Casdin Capital, LLC.