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): November 18, 2025

MARATHON BANCORP, INC.

(Exact Name of Registrant as Specified in its Charter)

Maryland	001-42608	86-2191258
(State or Other Jurisdiction	(Commission File No.)	(I.R.S. Employer
of Incorporation)		Identification No.)

500 Scott Street, Wausau, Wisconsin		54402
(Address of Principal Executive Offices)		(Zip Code)

Registrant’s telephone number, including area code: (715) 845-7331

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 (see General Instruction A.2. below):

☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common Stock, $0.01 par value		MBBC		The Nasdaq Stock Market LLC

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 5.07

Submission of Matters to a Vote of Security Holders

The Annual Meeting of Stockholders of Marathon Bancorp, Inc. (the “Company”) was held on November 18, 2025. The matters listed below were submitted to a vote of the stockholders through the solicitation of proxies, and the proposals are described in detail in the Company’s definitive proxy statement filed with the Securities and Exchange Commission on October 15, 2025. All proposals were approved by the Company’s stockholders. The final results of the stockholder vote were as follows:

1. Election of two directors for a three-year term ending in 2028.

	For	Withheld	Broker Non-Votes
Ann M. Werth	1,361,508	308,253	430,230
Timothy R. Wimmer	1,538,316	131,445	430,230

2.The ratification of the appointment of Bonadio & Co., LLP as the Company’s independent registered public accounting firm for the fiscal year ending June 30, 2026.

For		Against		Abstain		Broker Non-Votes
2,073,452		12,360		14,179		—

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.

		Marathon Bancorp, Inc.
DATE: November 18, 2025	By:	/s/ Nicholas W. Zillges
		Nicholas W. Zillges President and Chief Executive Officer

Marathon Bancorp, Inc. /MD/ 8-K