UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): June 6, 2025

IGM Biosciences, Inc.

(Exact name of Registrant as Specified in Its Charter)

Registrant’s Telephone Number, Including Area Code: (650) 965-7873

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 3.01 Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing.

On June 6, 2025, IGM Biosciences, Inc. (the “Company”) received written notice (the “Notice”) from The Nasdaq Stock Market LLC (“Nasdaq”) indicating that the Company is no longer in compliance with the minimum Market Value of Listed Securities (“MVLS”) of $50,000,000 required for continued listing on The Nasdaq Global Select Market, as set forth in Nasdaq Listing Rule 5450(b)(2)(A) (the “MVLS Requirement”). The Notice has no effect at this time on the listing of the Company’s common stock (the “Common Stock”), which continues to trade on The Nasdaq Global Select Market under the symbol “IGMS”.

In accordance with Nasdaq Listing Rule 5810(c)(3)(C), the Company has a period of 180 calendar days, or until December 3, 2025 (the “Compliance Date”), to regain compliance with the MVLS Requirement. To regain compliance, the Company’s MVLS must close at $50,000,000 or more for a minimum of 10 consecutive business days prior to the Compliance Date. In the event the Company does not regain compliance with the MVLS Requirement prior to the Compliance Date, Nasdaq will notify the Company that its securities are subject to delisting, at which point the Company may appeal the delisting determination to a Nasdaq hearings panel.

The Company intends to actively monitor its MVLS and may, if appropriate, consider implementing available options to regain compliance with the MVLS Requirement. The Company may also choose to transfer the listing of its Common Stock to The Nasdaq Capital Market. There can be no assurance that the Company will be able to regain compliance with Nasdaq Listing Rule 5450(b)(2)(A), or maintain compliance with any other listing requirements, or satisfy the requirements necessary to transfer the listing of its Common Stock to The Nasdaq Capital Market.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.