Sec Form 4 Filing - ROSS ROBERT W. @ Surface Oncology, Inc. - 2023-09-08

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person ROSS ROBERT W. 2. Issuer Name and Ticker or Trading Symbol Surface Oncology, Inc. [ SURF] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Executive Officer (Last) (First) (Middle) C/O SURFACE ONCOLOGY, INC., 50 HAMPSHIRE STREET, 8TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 09/08/2023 (Street) CAMBRIDGE, MA02139 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 09/08/2023 D( 1 ) 83,193 D 0 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (Right to Buy) $ 0.69 09/08/2023 D( 1 ) 400,000 ( 3 ) ( 3 ) Common Stock 400,000 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other ROSS ROBERT W. C/O SURFACE ONCOLOGY, INC. 50 HAMPSHIRE STREET, 8TH FLOOR CAMBRIDGE, MA02139 X Chief Executive Officer Signatures /s/ Jessica Fees, as Attorney-in-Fact 09/08/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This Form 4 reports securities disposed of pursuant to the terms of the Agreement and Plan of Merger dated as of June 15, 2023 (the "Merger Agreement"), by and among the Issuer, Coherus BioSciences, Inc. ("Coherus"), Crimson Merger Sub I, Inc., a direct, wholly owned subsidiary of Coherus ("Merger Sub I"), and Crimson Merger Sub II, LLC, a direct, wholly owned subsidiary of Coherus ("Merger Sub II"), pursuant to which Merger Sub I merged with and into the Issuer effective as of September 8, 2023 (the "Effective Time"), with Surface surviving such merger as a direct, wholly owned subsidiary of Coherus (the "First Merger"), and, as part of the same overall transaction, promptly after the First Merger, the surviving corporation of the First Merger merged with and into Merger Sub II, with Merger Sub II surviving such merger. ( 2 )At the Effective Time, each issued and outstanding share of common stock of the Issuer was cancelled and converted into the right to receive (i) 0.1960 (the "Exchange Ratio") shares of common stock of Coherus and (ii) one contingent value right (each, a "CVR") representing a contractual right to receive contingent future conditional payments pursuant to the terms of a Contingent Value Rights Agreement by and between Coherus and Computershare Inc. ( 3 )At the Effective Time, each option to purchase shares of the Issuer's Common Stock that was outstanding immediately prior to the Effective Time that had an exercise price per share equal to or less than $1.0354 (any such option, an "In-the-Money Option") was cancelled and converted into the right to receive (i) 0.1960 shares of common stock of Coherus and (ii) a number of CVRs equal to the number of shares of Surface common stock underlying such In-the-Money Option.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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