Sec Form 4 Filing - SINGER DAVID B @ Seer, Inc. - 2020-12-08

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 SINGER DAVID B 2. Issuer Name and Ticker or Trading Symbol Seer, Inc. [ SEER] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) ONE LETTERMAN DRIVE, BUILDING D,, SUITE DM100 3. Date of Earliest Transaction (MM/DD/YY) 12/08/2020 (Street) SAN FRANCISCO, CA94129 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 Class A Common Stock 12/08/2020 C 3,390,559 A 3,390,559 I See footnote ( 6 ) Class A Common Stock 12/08/2020 C 1,934,954 A 1,934,954 I See footnote ( 7 )

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 Series A Convertible Preferred Stock ( 1 ) 12/08/2020 C 1,280,724 ( 1 ) ( 1 ) Class A Common Stock 1,280,724 ( 1 ) 0 I See footnote ( 6 ) Series B Convertible Preferred Stock ( 2 ) 12/08/2020 C 1,275,928 ( 2 ) ( 2 ) Class A Common Stock 1,275,928 ( 2 ) 0 I See footnote ( 6 ) Series C Convertible Preferred Stock ( 3 ) 12/08/2020 C 265,434 ( 3 ) ( 3 ) Class A Common Stock 265,434 ( 3 ) 0 I See footnote ( 6 ) Series D Convertible Preferred Stock ( 4 ) 12/08/2020 C 326,269 ( 4 ) ( 4 ) Class A Common Stock 326,269 ( 4 ) 0 I See footnote ( 6 ) Series D-1 Convertible Preferred Stock ( 5 ) 12/08/2020 C 242,204 ( 5 ) ( 5 ) Class A Common Stock 242,204 ( 5 ) 0 I See footnote ( 6 ) Series A Convertible Preferred Stock ( 1 ) 12/08/2020 C 777,593 ( 1 ) ( 1 ) Class A Common Stock 777,593 ( 1 ) 0 I See footnote ( 7 ) Series B Convertible Preferred Stock ( 2 ) 12/08/2020 C 700,762 ( 2 ) ( 2 ) Class A Common Stock 700,762 ( 2 ) 0 I See footnote ( 7 ) Series C Convertible Preferred Stock ( 3 ) 12/08/2020 C 145,780 ( 3 ) ( 3 ) Class A Common Stock 145,780 ( 3 ) 0 I See footnote ( 7 ) Series D Convertible Preferred Stock ( 4 ) 12/08/2020 C 179,192 ( 4 ) ( 4 ) Class A Common Stock 179,192 ( 4 ) 0 I See footnote ( 7 ) Series D-1 Convertible Preferred Stock ( 5 ) 12/08/2020 C 131,627 ( 5 ) ( 5 ) Class A Common Stock 131,627 ( 5 ) 0 I See footnote ( 7 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other SINGER DAVID B ONE LETTERMAN DRIVE, BUILDING D, SUITE DM100 SAN FRANCISCO, CA94129 X X Signatures /s/ David Singer 12/10/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Each share of Series A Convertible Preferred Stock automatically converted into Class A Common Stock on a one-to-one basis immediately prior to the completion of the Issuer's initial public offering of Class A Common Stock and had no expiration date. ( 2 )Each share of Series B Convertible Preferred Stock automatically converted into Class A Common Stock on a one-to-one basis immediately prior to the completion of the Issuer's initial public offering of Class A Common Stock and had no expiration date. ( 3 )Each share of Series C Convertible Preferred Stock automatically converted into Class A Common Stock on a one-to-one basis immediately prior to the completion of the Issuer's initial public offering of Class A Common Stock and had no expiration date. ( 4 )Each share of Series D Convertible Preferred Stock automatically converted into Class A Common Stock on a one-to-one basis immediately prior to the completion of the Issuer's initial public offering of Class A Common Stock and had no expiration date. ( 5 )Each share of Series D-1 Convertible Preferred Stock automatically converted into Class A Common Stock on a one-to-one basis immediately prior to the completion of the Issuer's initial public offering of Class A Common Stock and had no expiration date. ( 6 )The reported shares are held of record by Maverick Ventures Investment Fund, L.P. ("Maverick Ventures Fund"). Maverick Capital Ventures, LLC (Maverick Ventures) is the general partner of Maverick Ventures Fund. As a Managing Partner of Maverick Ventures, the reporting person shares voting and dispositive power with respect to the shares held by Maverick Ventures Fund. The reporting person disclaims beneficial ownership of the reported securities of the Issuer held of record by Maverick Ventures Fund except to the extent of his pecuniary interest therein. ( 7 )The reported shares are held of record by Maverick Advisors Fund, L.P. ("Maverick Advisors"). Maverick Ventures is the general partner of Maverick Advisors. As a Managing Partner of Maverick Ventures, the reporting person shares voting and dispositive power with respect to the shares held by Maverick Advisors. The reporting person disclaims beneficial ownership of the reported securities of the Issuer held of record by Maverick Advisors except to the extent of his pecuniary interest therein.

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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