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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1690585	Magenta Therapeutics Inc.	MGTA	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1451612	Bruce Booth	C/O Magenta Therapeutics, Inc. 100 Technology Sq, 5Th Floor Cambridge MA 02139		Yes	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	Acquisiton	2020-06-29	1,250,000	$8.00	1,250,000	No	4	P	Indirect	See footnote

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

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	4,117,125	Indirect	See footnote

Footnotes

The shares are held directly by Atlas Venture Opportunity Fund I, L.P. ("Atlas Venture Opportunity Fund I"). The general partner of Atlas VentureOpportunity Fund I is Atlas Venture Associates Opportunity I, L.P. ("AVAO I LP"). Atlas Venture Associates Opportunity I, LLC ("AVAO I LLC") isthe general partner of AVAO I LP. Dr. Booth is a member of AVAO I LLC and disclaims beneficial ownership of such securities held by Atlas Venture Opportunity Fund I, except to the extent of his pecuniary interest therein, if any.
The shares are held directly by Atlas Venture Fund X, L.P. ("AVF X"). The general partner of AVF X is Atlas Venture Associates X, L.P. ("AVA X LP"). Atlas Venture Associates X, LLC ("AVA X LLC") is the general partner of AVA X LP. Dr. Booth is a member of AVA X LLC and disclaims beneficial ownership of such securities held by AVF X, except to the extent of his pecuniary interest therein, if any.