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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1651431	Checkmate Pharmaceuticals Inc.	CMPI	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1335659	M Arthur Krieg	C/O Checkmate Pharmaceuticals, Inc. 245 Main Street, 2Nd Floor Cambridge MA 02142	Chief Scientific Officer	No	Yes	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	2021-05-18	25,001	$6.97	804,932	No	4	P	Direct

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

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	68,457	Indirect	See footnote
Common Stock	68,457	Indirect	See footnote
Common Stock	68,457	Indirect	See footnote

Footnotes

The price reported in column 4 is a weighted average price. These shares were purchased in multiple transactions, at prices ranging from $6.42 to $7.02 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range.
The shares are held by an irrevocable trust for the Reporting Person's child. The Reporting Person serves as trustee of the trust. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose.