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Filing Details

Accession Number:: 0001209191-21-026325
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2021-04-09 20:53:21
Reporting Period:: 2021-04-07

Accepted Time:: 2021-04-09 20:53:21
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1733294	Generation Bio Co.	GBIO	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1577014	P Jason Rhodes	C/O Generation Bio Co. 301 Binney Street Cambridge MA 02142		Yes	No	No	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2021-04-07	37,970	$28.48	229,807	No	4	S	Indirect	See footnote
Common Stock	Disposition	2021-04-07	1,894	$29.19	227,913	No	4	S	Indirect	See footnote
Common Stock	Disposition	2021-04-08	40,359	$28.47	187,554	No	4	S	Indirect	See footnote
Common Stock	Disposition	2021-04-08	3,191	$28.90	184,363	No	4	S	Indirect	See footnote
Common Stock	Disposition	2021-04-09	41,549	$27.57	142,814	No	4	S	Indirect	See footnote
Common Stock	Disposition	2021-04-09	2,132	$28.35	140,682	No	4	S	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See footnote
No	4	S	Indirect	See footnote
No	4	S	Indirect	See footnote
No	4	S	Indirect	See footnote
No	4	S	Indirect	See footnote
No	4	S	Indirect	See footnote

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	9,111,939	Indirect	See footnote
Common Stock	1,366,937	Indirect	See footnote
Common Stock	608	Indirect	See footnote

Footnotes

Shares were sold pursuant to a Rule 10b5-1 trading plan dated January 14, 2021.
The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X") for no additional consideration to its limited partners and its and general partner, Atlas Venture Associates X, L.P. ("AVA X LP"), subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distribution of such shares constituted only a change in the form of the Reporting Person's ownership in such shares, the Reporting Person was not required to report the distribution pursuant to Section 16.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.10 to$29.07 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities andExchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (3), (5), (6), (7), (8) and (9).
These shares are held directly by AVA X LP. Atlas Venture Associates X, LLC ("AVA X LLC") is the general partner of AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims Section 16 beneficial ownership of such securities held by AVA X LP, except to the extent of his pecuniary interest therein, if any.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $29.12 to $29.30 inclusive.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.79 to $28.785 inclusive.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.79 to $29.00 inclusive.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.18 to $28.17 inclusive.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.18 to $28.63 inclusive.
These shares are held directly by Atlas Venture Fund X. The general partner of Atlas Venture Fund X is AVA X LP. AVA X LLC is the general partner of AVA X LP. The Reporting Person is a member of AVA X LLC and disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund X, except to the extend if its pecuniary interest therein, if any.
The shares reported herein give effect to the pro rata distribution of shares by Atlas Venture Opportunity Fund I, L.P. ("AVOF I") for no additional consideration to its limited partners and its and general partner, Atlas Venture Associates Opportunity I, LP ("AVAO LP"), subsequent to the Reporting Person's last Section 16 filing reporting ownership of the Issuer's Common Stock. As the distribution of such shares constituted only a change in the form of the Reporting Person's ownership in such shares, the Reporting Person was not required to report the distribution pursuant to Section 16.
The shares are owned directly by AVOF I. AVAO LP is the general partner of AVOF I. Atlas Venture Associates Opportunity I, LLC ("AVAO LLC") is the general partner of AVAO LP. The Reporting Person is a member of AVAO LLC and disclaims Section 16 beneficial ownership of such securities held by AVOF I, except to the extent of his pecuniary interest therein, if any.
These shares are held directly by AVAO LP. AVAO LLC is the general partner of AVAO LP. The Reporting Person is a member of AVAO LLC and disclaims Section 16 beneficial ownership of such securities held by AVAO LP, except to theextent of his pecuniary interest therein, if any.