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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1718108	Surface Oncology Inc.	SURF	Biological Products, (No Disgnostic Substances) (2836)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1732786	S. David Grayzel	C/O Surface Oncology, Inc. 50 Hampshire Street 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	Disposition	2020-12-17	1,700,000	$18.10	2,945,453	No	4	S	Indirect	See Footnote #

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

Footnotes

Represents shares sold by Atlas Venture Fund IX, L.P. ("Atlas IX"). Atlas Venture Associates IX, L.P. ("AVA IX LP") is the general partner of Atlas IX. Atlas Venture Associates IX, LLC ("AVA IX LLC") is the general partner of AVA IX LP. The Reporting Persons owns an interest in AVA IX LP and disclaims Section 16 beneficial ownership of the securities held by Atlas IX, except to the extent of his pecuniary interest therein, if any. This report shall not be deemed to an admission that Mr. Grayzel is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.
The high, low and average for the shares sold were all $8.10. 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 sold at each separate price within the range set forth in footnote (2) of this Form 4.
These shares are held directly by Atlas IX. The sole general partner of Atlas IX is AVA IX LP. AVA IX LLC is the sole general partner of AVA IX LP. The Reporting Persons owns an interest in AVA IX LP and disclaims Section 16 beneficial ownership of the securities held by Atlas IX, except to the extent of his pecuniary interest therein, if any. This report shall not be deemed to an admission that Mr. Grayzel is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.