UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 11-K

FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS

AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

☒	ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934.

For the fiscal year ended December 31, 2021

☐	TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934.

For the transition period from _______________ to _______________

Commission File Number 000-56269

A. Full title of the plan and the address of the plan, if different from that of the issuer named below:

Marathon Bank 401(k) Plan

B: Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:

Marathon Bancorp, Inc.

500 Scott Street

Wausau, Wisconsin 54402

SUMMARY ANNUAL REPORT

for

Marathon Bank 401(k) Plan

This is a summary of the annual report for Marathon Bank 401(K) Plan (Employer Identification Numer 39-0449690, Plan Number 002) for January 1, 2021 thorugh December 31, 2021. The annual report has been filed with the Employee Benefits Security Administration, formerly known as the Pension and Welfare Benefits Administration, as required under the Employee Retirement Income Security Act of 1974 (ERISA).

Basic Financial Statement

Plan expenses were $42,972. These expenses included $33,600 in administrative expenses, $9,272 in benefits paid to participants and beneficiaries, and $100 in other expenses. A total of 56 persons were participants in or beneficiaries of the plan at the end of the plan year, although not all of these persons had yet earned the right to receive benefits.

The value of plan assets, after subtracting liabilities of the plan was $4,337,509 as of December 31, 2021 compared to $3,561,835 as of January 1, 2021. During the plan year the plan experienced an increase in its net assets of $775,674. This increase includes unrealized appreciation or depreciation in the value of plan assets; that is, the difference between the value of the plan's assets at the end of the year and the value of the assets at the beginning of the year or the cost of assets acquired during the year. The plan had total income of $818,646, including employer contributions of $122,568, employee contributions of $211,773 and earnings from investments of $484,305.

The U.S. Department of Labor's regulations require that an independent qualified public accountant audit the plan's financial statements unless certain conditions are met for the audit requirement to be waived. This plan met the audit waiver conditions for the period covered by this Summary Annual Report and therefore has not had an audit performed. Instead, the following information is provided to assist you in verifying that the assets reported in the Form 5500-SF were actually held by the plan.

As of the last day of the period covered by this Summary Annual Report, the plan had:

$989,995 in assets held by Community Bank of Pleasant Hill

$3,261,030 in investment or annuity contracts issued by John Hancock USA

The plan receives year-end statements from these regulated financial institutions that confirm the above information. The remainder of the plan's assets were Qualifying Employer Securities, loans to participants.

Plan participants and beneficiaries have a right, on request and free of charge, to get copies of the financial institution year-end statements and evidence of the fidelity bond. If you want to examine or get copies of the financial institution year-end statements or evidence of the fidelity bond, please contact Marathon Bank who is Plan Administrator at 500 Scott Street, PO BOX 1666, Wausau WI 54402-1666.

If you are unable to obtain or examine copies of the regulated financial institution statements or evidence of the fidelity bond, you may contact the regional office of the U.S. Department of Labor's Employee Benefits Security Administration (EBSA) for assistance by calling toll-free 1-866-444-EBSA (1-866-444-3272). A listing of EBSA regional offices can be found at https://www.dol.gov/agencies/ebsa. General information regarding the audit waiver conditions applicable to the plan can be found on the U.S. Department of Labor web site at https://www.dol.gov/agencies/ebsa under the heading "Frequently Asked Questions."

Your Rights to Additional Information

You have the right to receive a copy of the full annual report, or any part thereof, on request. The items listed below are included in that report:

1. insurance information including sales commissions paid by insurance carriers.

To obtain a copy of the full annual report, or any part thereof, write or call the office of Marathon Bank, who is Plan Administrator at 500 Scott Street, PO BOX 1666, Wausau WI 54402-1666, telephone number (715) 845-7331. There will be no charge

for copying the report in whole or in part.

You also have the right to receive from the plan administrator, on request and at no charge, a statement of the assets and liabilities of the plan and accompanying notes, if any, or a statement of income and expenses of the plan and accompanying notes, if any, or both. If you request a copy of the full annual report from the plan administrator, these two statements and accompanying notes, if any, will be included as part of that report. The charge to cover copying costs given above does not include a charge for copying of these portions of the report because these portions are furnished without charge.

You also have the legally protected right to examine the annual report at the main office of the plan at 500 Scott Street, PO BOX 1666, Wausau WI 54402-1666 and at the US Department of Labor in Washington DC, or obtain a copy from the US Department of Labor upon payment of copying costs. Requests to the Department should be addressed to: Public Disclosure Room, Room N-1513, Employee Benefits Security Administration, US Department of Labor, 200 Constitution Avenue, NW, Washington DC 20210.

SIGNATURES

The Plan. Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized.

		MARATHON BANK 401(k) PLAN




Date: June 28, 2022	By:	/s/ Nicholas W. Zillges
		Nicholas W. Zillges
		President and Chief Executive Officer