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): ~~April~~May 2428, 2026

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 85.~~01.~~02 ~~Other~~Departure ~~Events~~of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

(e) On ~~April~~May 2428, 2026, the stockholders of Marathon Bancorp, Inc. (the “Company”) ~~announced~~approved itthe ~~has~~Company’s ~~adopted~~2026 aEquity ~~stock~~Incentive ~~repurchase~~Plan ~~program. Under~~ (the ~~repurchase program~~“Plan”), ~~the~~which ~~Company~~provides ~~may~~for ~~repurchase~~the upgrant of stock-based awards to ~~146~~officers,~~931~~ ~~shares~~employees ofand ~~its~~directors ~~common~~of ~~stock,~~the orCompany ~~approximately~~and 5Marathon Bank.0% A description of the ~~current~~material ~~outstanding~~terms ~~shares. Repurchases~~of ~~are expected~~the toPlan ~~commence~~is ~~after~~contained in the Company’s ~~publicly~~definitive ~~releases~~proxy ~~its~~statement ~~results~~for ofthe ~~operations~~Special atMeeting ~~and~~of ~~for~~Stockholders filed with the ~~three~~Securities and ~~nine~~Exchange ~~months~~Commission ~~ended~~on ~~March~~April 3124, 2026. A copy of the Plan is filed as Exhibit 10.1 to this Current Report on Form 8-K.

AItem ~~copy~~5.07 Submission of ~~the~~Matters ~~press release announcing the stock repurchase program is included as exhibit 99.1~~ to ~~this~~a ~~report~~Vote ~~and~~of isSecurity ~~incorporated herein by reference.~~Holders

~~Item~~A 9Special Meeting of Stockholders of the Company was held on May 28, 2026.01 ~~Financial~~The ~~Statements~~matter listed below was submitted to a vote of the stockholders through the solicitation of proxies, and ~~Exhibits~~the proposal is described in detail in the Company’s definitive proxy statement filed with the Securities and Exchange Commission on April 24, 2026. The proposal was approved by the Company’s stockholders. The final results of the stockholder vote were as follows:

(a)	Financial statements of businesses acquired. None.
(b)	Pro forma financial information. None.
(c)	Shell company transactions: None.
(d)	Exhibits.
	99.1	Press release dated April 24, 2026
	104	Cover Page Interactive Data File (embedded in the cover page formatted in Inline XBRL)

1.	The approval of the Company’s 2026 Equity Incentive Plan.

Item 9.01. Financial Statements and Exhibits

(d) Exhibits

Exhibit No.		Description
10.1		Marathon Bancorp, Inc. 2026 Equity Incentive Plan (incorporated by reference to Appendix A to the proxy statement for the Special Meeting of Stockholders filed with the Securities and Exchange Commission on April 24, 2026 (file no. 001-42608))

104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

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: April 24, 2026	By:	/s/ Nicholas W. Zillges
DATE: May 28, 2026	By:	/s/ Nicholas W. Zillges
		Nicholas W. Zillges President and Chief Executive Officer

Broker Non-Votes

Filing Compare · Marathon Bancorp, Inc. /MD/