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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1690585	Magenta Therapeutics Inc.	MGTA	Pharmaceutical Preparations (2834)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1741287	Jr C. John Davis	C/O Magenta Therapeutics, Inc. 100 Technology Square Cambridge MA 02139	Chief Medical 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	Acquisiton	2020-01-02	11,294	$9.49	19,598	No	4	M	Direct
Common Stock	Disposition	2020-01-02	11,294	$15.04	8,304	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
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)	Disposition	2020-01-02	11,294	$0.00	11,294	$9.49

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
224,831		2028-04-25	No	4	M	Direct

Footnotes

This trade is pursuant to an active 10b5-1 plan.
This transaction was executed in multiple trades at prices ranging from $15.00 to $15.09. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request by the staff of the U.S. Securities and Exchange Commission, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.
25% vested on February 16, 2019 with the remaining 75% vesting in 12 equal quarterly installments thereafter.