MBBC on Nasdaq

Marathon Bancorp, Inc. /MD/

Marathon Bancorp, Inc. /MD/ is a savings institutions company, listed on Nasdaq (MBBC).1 It is headquartered in Wausau, Wisconsin.1

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Last updated Oct 20, 2026.

Overview

$1.8MNet income, fiscal 20262

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  • TickerMBBC on Nasdaq1
  • IndustrySavings Institutions, Not Federally Chartered1
  • HeadquartersWausau, Wisconsin1
  • Business address500 Scott Street, Wausau, Wi 544033
  • Filer categoryNon-accelerated filer, Smaller reporting company3

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Marathon Bancorp, Inc. (the “Company” or “Marathon Bancorp”), a Maryland corporation, was formed in December 2020 to serve as the mid-tier holding company for Marathon Bank (the “Bank”) upon the completion of the Bank’s mutual holding company reorganization and offering.5 From its latest annual report

Financials

From the company’s reports to the SEC. Every number links to the filing it came from.

Key numbers, fiscal 2026

3.7%Return on equity2
$2.0MFree cash flow2

Financial statements

Net income6789102$1.8M in 2026+329% since 2020
-$500.0K0$500.0K$1.0M$1.5M$2.0M2020: $417.9K$417.9K20202021: $1.4M$1.4M2021+229%2022: $1.3M$1.3M2022−3%2023: $1.7M$1.7M2023+25%2024: -$187.0K-$187.0K20242025: $42.4K$42.4K20252026: $1.8M$1.8M2026+4120%

Every line of the income statement as filed: the last 2 fiscal years, latest first.2

Period ending2026-06-302025-06-30
Loans, including fees$11.1M$8.6M
Debt securities$150.7K$168.6K
Other$668.5K$733.5K
Total interest income$11.9M$9.6M
Deposits$3.0M$3.0M
Borrowings and other$710.8K$468.7K
Total interest expense$3.7M$3.5M
Net Interest Income$8.2M$6.0M
Provision for (Recovery of) Credit Losses$35.5K-$93.8K
Net Interest Income After Provision for (Recovery of) Credit Losses$8.2M$6.1M
Service charges on deposit accounts$122.9K$114.2K
Mortgage banking income$299.1K$291.4K
Increase in cash surrender value of life insurance$284.3K$269.9K
Other non-interest income$121.6K$73.5K
Total non-interest income$828.0K$748.9K
Salaries and employee benefits$3.9M$3.6M
Occupancy and equipment expenses$891.0K$915.1K
Data processing and office$315.1K$450.1K
Professional fees$855.5K$700.7K
Marketing expenses$69.9K$42.2K
FDIC insurance premiums$105.6K$95.8K
Directors fees$108.2K$108.2K
Foreclosed assets, net$56.5K$429.1K
Other non-interest expenses$578.2K$487.4K
Total non-interest expenses$6.9M$6.9M
Income Before Provision for (Benefit From) Income Taxes$2.1M$10.9K
Provision For (Benefit From) Income Taxes$341.0K-$31.6K
Net Income$1.8M$42.4K
Net income per common share-basic$0.67$0.02
Net income per common share-diluted$0.66$0.02
Weighted average number of common shares outstanding-basic2.7M shares2.8M shares
Weighted average number of common shares outstanding-diluted2.7M shares2.8M shares

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Corporate structure

Marathon Bancorp, Inc. /MD/ sits at the top of its group. 4 entities, 1 country on record. Switch between the flow chart and the network, and select any entity to see its details.

Major holders of Marathon Bancorp, Inc. /MD/

  • Marathon Bank 401(k) Plan Trust Filed SCHEDULE 13G/A on Marathon Bancorp, Inc. /MD/, latest Jul 1, 2026 (2 filings since Jul 1, 2026)
  • AllianceBernstein Filed SCHEDULE 13G on Marathon Bancorp, Inc. /MD/, latest Feb 17, 2026
  • Marathon Bank Employee Stock Ownership Plan Trust Filed SCHEDULE 13G on Marathon Bancorp, Inc. /MD/, latest Sep 2, 2025
  • Marathon Bancorp, Inc. /MD/ Wausau, Wisconsin
    • 520 N 28 th Avenue, LLC (b) Subsidiary · Wisconsin, United States
    • Marathon Bank (a) Subsidiary · Wisconsin, United States
    • Marathon Property Holdings, LLC (b) Subsidiary · Wisconsin, United States

Built from subsidiaries listed in Exhibit 21 of annual reports filed with the SEC; major holders from Schedules 13D and 13G. Each entity in the chart links to its source.

What it owns

What Marathon Bancorp, Inc. /MD/ reports owning in its annual reports to the SEC: buildings, land and equipment, real estate and locations, investments, intangible assets and inventory, at the end of its latest fiscal year and a year before.

Property and equipment

ItemLatestA year beforeChange
Property and equipment, before depreciation$7.8M2 Jun 30, 2026$7.5M2 Jun 30, 2025+4.2%
Accumulated depreciation$3.9M2 Jun 30, 2026$3.6M2 Jun 30, 2025+8.0%
Property and equipment, net$3.9M2 Jun 30, 2026$3.9M2 Jun 30, 2025+0.8%
Operating-lease assets (leased space)$328.4K2 Jun 30, 2026$443.3K2 Jun 30, 2025−25.9%

Investments

ItemLatestA year beforeChange
Loans, net of allowance$217.4M2 Jun 30, 2026$200.8M2 Jun 30, 2025+8.3%

Properties, in its own words

As of June 30, 2026, the net book value of our office properties was $3.6 million (excluding right-to-use-assets). The following table sets forth information regarding our offices. See Note 5 to the Audited Consolidated Financial Statements for additional information regarding the Company’s property and equipment.

Leased or · Year Acquired · Net Book Value of

The rest of Item 2

Location · Owned · or Leased · Real Property

Main Office:

500 Scott Street, Wausau, WI 54403 · Owned · 1963 · 854

Other Properties:

1133 E Grand Avenue, Rothschild, WI · Leased · 2009 · 27

307 Third Street, Mosinee, WI · Owned · 1974 · 42

11315 N. Cedurburg Rd, Mequon, WI · Leased · 2018 · 206

19105 W. Capitol Dr., Brookfield, WI · Owned · 2024 · 1,906

Land, Weston, WI · Owned · 2024 · 158

New Holstein (not in service) · Owned · 2026 · 393

We believe that current facilities are adequate to meet our present and foreseeable needs, subject to possible future expansion.

Item 2 of the 10-K filed Sep 16, 2026.5

Leadership

Who has led Marathon Bancorp, Inc. /MD/, and when. Pick a name to see everywhere that person has worked.

Chief executive

  1. Nicholas W. Zillges2021–now

Chair

  1. Amy Zientara2022

President

  1. Nicholas W. Zillges2021–now

Chief financial officer

  1. Joy Selting-Buchberger2021–now

Chief operating officer

  1. Michelle Knopf2024–now
2025
Board members and other officers (9)

Subsidiaries and ownership

Subsidiaries (Exhibit 21)

  • 520 N 28 th Avenue, LLC (b) Wisconsin4
  • Marathon Bank (a) Wisconsin4
  • Marathon Property Holdings, LLC (b) Wisconsin4

The subsidiaries the company lists in Exhibit 21 of its annual report, as filed.

Timeline

  1. Oct 1, 20268-K Executive or director change25
  2. May 28, 20268-K Executive or director change; Shareholder vote26
  3. Apr 24, 20268-K Other events27
  4. Nov 18, 20258-K Shareholder vote28
  5. Apr 21, 20258-K Other events29
  6. Apr 16, 20258-K Other events30
  7. Mar 31, 20258-K Shareholder vote; Other events31
  8. Mar 24, 20258-K Other events32
  9. Feb 20, 20258-K Other events33
  10. Feb 18, 20258-K Entered a material agreement34
  11. Dec 12, 20248-K Other events35
  12. Nov 19, 20248-K Shareholder vote36
  13. Apr 14, 2021New chief executive Nicholas W. Zillges becomes CEO13

Filings

199 filings to the SEC since October 2021: 5 annual reports, 15 quarterly reports, 21 major events, 122 insider forms, 4 large holders, 32 other. The latest 20:

  1. Oct 13, 2026ARS EDGAR
  2. Oct 13, 2026DEF 14A EDGAR
  3. Oct 1, 20268-K CURRENT REPORT FILING EDGAR
  4. Sep 18, 20264 EDGAR
  5. Sep 16, 202610-K EDGAR
  6. Jul 1, 2026SCHEDULE 13G/A EDGAR
  7. Jul 1, 2026SCHEDULE 13G EDGAR
  8. Jun 30, 20264 EDGAR
  9. Jun 30, 20264 EDGAR
  10. Jun 30, 20264 EDGAR
  11. Jun 30, 20264 EDGAR
  12. Jun 30, 20264 EDGAR
  13. Jun 29, 202611-K EDGAR
  14. Jun 17, 20264 EDGAR
  15. Jun 16, 20264 EDGAR
  16. Jun 16, 20264 EDGAR
  17. Jun 16, 20264 EDGAR
  18. Jun 16, 20264 EDGAR
  19. Jun 16, 20264 EDGAR
  20. Jun 16, 20264 EDGAR

The 199 filings since October 2021 can be filtered by form type and year here when JavaScript is on.

Every filing from the last five years, summarized. The full record is on SEC EDGAR.

Insider trades

34 open-market trades by officers, directors and large owners since October 2021: 34 buys and 0 sales. Grants, option exercises and gifts are left out.

DateWhoTradeSharesPriceValueFiling
Jun 16, 2026Zillges Nicholas WPresident and CEOBuy970$15.00$14.6KForm 4
Jun 10, 2026Cornish TerrySVP and CCOBuy219$14.75$3.2KForm 4
Jun 10, 2026Knopf MichelleEVP and COOBuy164$14.75$2.4KForm 4
Jun 10, 2026Zillges Nicholas WPresident and CEOBuy170$14.75$2.5KForm 4
Jun 10, 2026Spatz NoraEVP and CAOBuy602$14.75$8.9KForm 4
Jun 9, 2026Cornish TerrySVP and CCOBuy693$14.50$10.0KForm 4
Jun 9, 2026Knopf MichelleEVP and COOBuy519$14.50$7.5KForm 4
Jun 9, 2026Zillges Nicholas WPresident and CEOBuy537$14.50$7.8KForm 4
Jun 9, 2026Spatz NoraEVP and CAOBuy1,904$14.50$27.6KForm 4
Jun 8, 2026Cornish TerrySVP and CCOBuy71$14.24$1.0KForm 4
Jun 8, 2026Knopf MichelleEVP and COOBuy54$14.24$769Form 4
Jun 8, 2026Zillges Nicholas WPresident and CEOBuy55$14.24$783Form 4
Jun 8, 2026Spatz NoraEVP and CAOBuy197$14.24$2.8KForm 4
Jun 5, 2026Cornish TerrySVP and CCOBuy116$14.25$1.7KForm 4
Jun 5, 2026Knopf MichelleEVP and COOBuy87$14.25$1.2KForm 4
Jun 5, 2026Zillges Nicholas WPresident and CEOBuy90$14.25$1.3KForm 4
Jun 5, 2026Spatz NoraEVP and CAOBuy320$14.25$4.6KForm 4
Jun 4, 2026Cornish TerrySVP and CCOBuy27$13.77$372Form 4
Jun 4, 2026Knopf MichelleEVP and COOBuy20$13.77$275Form 4
Jun 4, 2026Zillges Nicholas WPresident and CEOBuy21$13.77$289Form 4

All 34 trades can be filtered by person here when JavaScript is on.

From Forms 4 filed with the SEC.

Major holders

Investors who own more than 5% of the shares must tell the SEC: a 13D if they may seek to influence the company, a 13G if they hold passively.

Executive pay

What the company paid its top executives, from the summary compensation table in its proxy statement. Total pay includes salary, bonus, stock and option awards and other pay, as the company valued them.

YearExecutiveAgeSalaryTotal pay
2026Nora SpatzExecutive Vice President and Chief Administrative Officer$165.8K$361.2K40

Held by these funds

The largest holders among investment managers' 13F reports for the quarter ending Jun 30, 2026. Change is in shares since the quarter before.

FundSharesValueShare of the fundChange
Raffles Associates LP215,328$3.3M1.4%+107,664
Maltese Capital Management LLC145,298$2.2M0.4%+198
Alliancebernstein L.P.153,238$2.1M0.0%No change
Vanguard Capital Management LLC76,027$1.2M0.0%−571
Minerva Advisors LLC55,750$851.9K0.5%−3,226
KLCM Advisors, Inc.34,320$524.4K0.0%No change
Stilwell Value LLC20,000$305.6K0.2%No change
Vanguard Fiduciary Trust Co11,514$175.9K0.0%−4,920
Citadel Advisors LLC10,984$167.8K0.0%New
Geode Capital Management, LLC10,871$166.1K0.0%New
BlackRock, Inc.8,357$127.7K0.0%New
UBS Group AG89$1.4K0.0%New

13F reports cover disclosed long positions in U.S. stocks only.

SEC filer profile

How Marathon Bancorp, Inc. /MD/ is registered with the Securities and Exchange Commission, from its EDGAR record and the cover page of its latest annual report.

  • Name on EDGARMarathon Bancorp, Inc. /MD/1
  • CIK0001835385
  • Employer ID (EIN)86-21912585
  • Filer statusNon-accelerated filer not an emerging growth company; a smaller reporting company; not a shell company5
  • Incorporated inMaryland5
  • Fiscal year endsJune 301
  • Industry code (SIC)6036 Savings Institutions, Not Federally Chartered1
  • SEC reviewing officeOffice of Finance, Division of Corporation Finance1
  • Business address500 Scott Street, Wausau, WI 544031
  • Phone(715) 845-73311
  • Shares outstanding3,009,903 shares as of Sep 15, 20265
  • Public float$6.9M as of Dec 31, 20255
  • AuditorBonadio & Co., LLP, Pittsford, New York PCAOB ID 1884; no auditor attestation of internal control over financial reporting5
  • On EDGAR sinceDec 11, 20201
  • Filings232 in all: 4 (114), 8-K (28), 10-Q (17), 3 (11), DEF 14A (8), 10-K (6), 4/A (6), 11-K (5)1
    All 24 form types

    424B3 (5), CORRESP (5), ARS (4), S-8 (4), SCHEDULE 13G (3), 3/A (2), EFFECT (2), S-1 (2), S-1/A (2), UPLOAD (2), 425 (1), 8-A12B (1), 8-A12G (1), CERT (1), SC 13D (1), SCHEDULE 13G/A (1)

  • Latest filingsAnnual report (10-K) Sep 16, 2026
    Quarterly report (10-Q) May 13, 2026
    Proxy statement (DEF 14A) Oct 13, 2026
    Latest 8-K (8-K) Oct 1, 2026

Securities registered for trading

ClassSymbolExchange
Common Stock, $.01 par valueThe Nasdaq Stock Market LLC

From the cover page of the 10-K filed Sep 16, 2026 (Section 12(b) of the Exchange Act).5

Risk factors and legal proceedings

Legal proceedings

We are not involved in any pending legal proceedings as a defendant other than routine legal proceedings occurring in the ordinary course of business. At June 30, 2026, we were not involved in any legal proceedings the outcome of which would be material to our financial condition or results of operations.

The opening of Item 3, Legal Proceedings.5

Sources

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