Definitive Additional Materials





Washington, D.C. 20549








Filed by the Registrant  ☒                            Filed by a Party other than the Registrant   ☐

Check the appropriate box:


Preliminary Proxy Statement


Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))


Definitive Proxy Statement


Definitive Additional Materials


Soliciting Material Pursuant to §240.14a-11(c) or §240.14a-2

IGM Biosciences, Inc.

(Name of Registrant as Specified In Its Charter)

Payment of Filing Fee (Check the appropriate box):


  No fee required.
  Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

Title of each class of securities to which transaction applies:



Aggregate number of securities to which transaction applies:



Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):



Proposed maximum aggregate value of transaction:



Total fee paid:


  Fee paid previously with preliminary materials.
  Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

Amount Previously Paid:



Form, Schedule or Registration Statement No.:



Filing Party:



Date Filed:






Your Vote Counts! IGM BIOSCIENCES, INC. 325 E. MIDDLEFIELD ROAD MOUNTAIN VIEW, CA 94043 IGM BIOSCIENCES, INC. 2021 Annual Meeting Vote by June 23, 2021 11:59 PM ET You invested in IGM BIOSCIENCES, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on June 24, 2021. Vote Virtually at the Meeting* June 24, 2021 8:00 a.m. (Pacific Time) Virtually at: *Please check the meeting materials for any special requirements for meeting attendance. Smartphone users Point your camera here and vote without entering a control number V1 For complete information and to vote, visit Control # D54185-P56582 Get informed before you vote View the Notice and Proxy Statement and Form 10-K online OR you can receive a free paper or email copy of the material(s) by requesting prior to June 10, 2021. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit, (2) call 1-800-579-1639 or (3) send an email to If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy.


THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Vote at Prefer to receive an email instead? While voting on, be sure to click “Sign up for E-delivery”. Voting Items Board Recommends D54186-P56582 1. Election of Directors Nominees: 01) Kathleen Behrens, Ph.D. 02) Michael Loberg, Ph.D. 03) Christina Teng Topsøe For For For 2. Ratification of the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for our fiscal year ending December 31, 2021. 3. Approval of the amendment to our amended and restated certificate of incorporation to increase the number of authorized shares of our non-voting Common Stock from 6,431,208 to 200,000,000, with a corresponding increase to the total number of authorized shares of our Common Stock. NOTE: The proxy holders will vote in their discretion on any other business as may properly come before the Annual Meeting or any adjournment or postponement thereof.