Sec Form 3 Filing - LANGER ROBERT @ Seer, Inc. - 2020-12-03

FORM 3 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 LANGER ROBERT 2. Issuer Name and Ticker or Trading Symbol Seer, Inc. [ SEER] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O SEER, INC., 3800 BRIDGE PARKWAY, SUITE 102 3. Date of Earliest Transaction (MM/DD/YY) 12/03/2020 (Street) REDWOOD CITY, CA94065 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 159,526 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 Series A Convertible Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class A Common Stock 205,831 D Class B Common Stock ( 2 ) ( 2 ) ( 2 ) Class A Common Stock 327,102 D Stock Option (right to buy) $ 0.05 ( 3 ) 05/17/2028 Class A Common Stock 104,048 D Stock Option (right to buy) $ 2.7 ( 4 ) 01/27/2030 Class A Common Stock 101,886 D Stock Option (right to buy) $ 3.47 ( 5 ) 07/28/2030 Class A Common Stock 121,562 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other LANGER ROBERT C/O SEER, INC. 3800 BRIDGE PARKWAY, SUITE 102 REDWOOD CITY, CA94065 X Signatures /s/ Elona Kogan, by power of attorney 12/03/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Each share of Series A Convertible Preferred Stock shall automatically convert 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 has no expiration date. ( 2 )Each share of Class B Common Stock is convertible at any time into Class A Common Stock on a one-to-one basis at the reporting person's election and has no expiration date. ( 3 )The shares underlying the option are subject to an early exercise provision and are immediately exercisable. One-fourth of the shares underlying the option vested on March 23, 2019 and 1/48th of the shares vest monthly thereafter. ( 4 )The shares underlying the option are subject to an early exercise provision and are immediately exercisable. The shares underlying the option vest in 48 equal monthly installments beginning on February 28, 2020. ( 5 )The shares underlying the option are subject to an early exercise provision and are immediately exercisable. The shares underlying the option vest in 48 equal monthly installments beginning on August 28, 2020.

Remarks: Exhibit 24 - Power of Attorney

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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