Sec Form 4 Filing - LOBERG MICHAEL D @ IGM Biosciences, Inc. - 2022-03-31

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 LOBERG MICHAEL D 2. Issuer Name and Ticker or Trading Symbol IGM Biosciences, Inc. [ IGMS] 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 IGM BIOSCIENCES, INC., 325 E. MIDDLEFIELD ROAD 3. Date of Earliest Transaction (MM/DD/YY) 03/31/2022 (Street) MOUNTAIN VIEW, CA94043 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 02/08/2022 G V 300 D $ 0 0 D Common Stock 02/08/2022 G V 300 A $ 0 600 I See footnote( 1 ) Common Stock 03/31/2022 A 533( 2 ) A $ 0 533 D Common Stock 04/01/2022 P( 3 ) 21,739 A $ 23 21,739 I See footnote( 4 ) Common Stock 43,143 I See footnote( 5 )

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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other LOBERG MICHAEL D C/O IGM BIOSCIENCES, INC. 325 E. MIDDLEFIELD ROAD MOUNTAIN VIEW, CA94043 X Signatures /s/ Misbah Tahir, by power of attorney 04/04/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The shares are held by the Revocable Deed of Trust of Michael D. Loberg (Michael and Melinda Loberg, Trustees), of which Reporting Person and his spouse serve as trustees (the "Loberg Revocable Trust"). ( 2 )Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock. The amount reflects payment of a quarterly retainer in common stock pursuant to the Issuer's Outside Director Compensation Policy. ( 3 )The shares were purchased pursuant to an underwritten public offering of the Issuer's securities. ( 4 )The shares are held by the Loberg Revocable Trust. The shares were purchased by Michael D. Loberg and then immediately transferred to the Loberg Revocable Trust. ( 5 )The shares are held by the Michael D. Loberg Qualified Annuity Interest Trust IX (Michael and Melinda Loberg, Trustees), of which Reporting Person and his spouse serve as trustees (the "Loberg Annuity Trust IX"). The number of shares held reflects the transfers on March 16, 2022 of (i) 29,547 shares from from Michael D. Loberg Qualified Annuity Interest Trust VII (Michael and Melinda Loberg, Trustees), to the Loberg Revocable Trust, (ii) 12,996 shares from Michael D. Loberg Qualified Annuity Interest Trust VIII (Michael and Melinda Loberg, Trustees), to the Loberg Revocable Trust, and (iii) 43,143 shares (including the 600 shares listed in column 5 of the second line item of Table I) from the Loberg Revocable Trust to the Loberg Annuity Trust IX.

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).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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