Marathon Bancorp, Inc.
- MBBC · Nasdaq
- Savings Institutions, Not Federally Chartered
- Wausau, WI
- 31 employees
- CIK 0001835385
Updated from SEC filings through
Top things to know
Executives
- Nicholas W. Zillges President and CEO 4, 2026-06-30
- Joy Selting-Buchberger SVP and CFO 4, 2026-06-30
- Nora Spatz EVP and CAO 4, 2026-09-18
- Michelle Knopf EVP and COO 4, 2026-06-30
- Terry Cornish SVP and CCO 4, 2026-06-30
Marathon Bancorp, Inc. is a U.S. public company in savings institutions, not federally chartered (SIC 6036), headquartered in Wausau, WI. It trades as MBBC on Nasdaq. Revenue was $11.9M in the fiscal year ending June 30, 2026, +24.6% from the year before. It reported about 31 employees. Nicholas W. Zillges is President and CEO.
Five-year financials
| Metric | FY2026 | FY2025 | FY2024 | FY2023 | FY2022 |
|---|---|---|---|---|---|
| Revenue | $11.9M 10-K, 2026-09-16 | $9.6M 10-K, 2026-09-16 | $9.4M 10-K, 2025-09-26 | $9.0M 10-K, 2024-09-26 | $7.2M 10-K, 2023-09-20 |
| Operating income | Not on file | Not on file | Not on file | Not on file | Not on file |
| SG&A | Not on file | Not on file | Not on file | Not on file | Not on file |
| Net income | $1.8M 10-K, 2026-09-16 | $42K 10-K, 2026-09-16 | -$187K 10-K, 2025-09-26 | $1.7M 10-K, 2024-09-26 | $1.3M 10-K, 2023-09-20 |
Annual figures from XBRL in each company's own filings. Click a figure to open the filing. SG&A marked derived is general and administrative plus selling and marketing.
Leadership and board
| Name | Title | Source |
|---|---|---|
| Nicholas W. Zillges President & CEO at Marathon Bancorp, Inc. & Marathon Bank | President and CEO | 4, 2026-06-30 |
| Joy Selting-Buchberger | SVP and CFO | 4, 2026-06-30 |
| Nora Spatz | EVP and CAO | 4, 2026-09-18 |
| Michelle Knopf Executive Vice President/Chief Operating Officer of Marathon Bank | EVP and COO | 4, 2026-06-30 |
| Terry Cornish Senior Vice President - Chief Credit Officer at Marathon Bank | SVP and CCO | 4, 2026-06-30 |
What Marathon Bancorp, Inc. does
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.
Shares and governance
| Shares outstanding | 3.0 million (as of September 15, 2026) | 10-K, September 16, 2026 |
|---|---|---|
| Public float | $6.9M (as of December 31, 2025) | 10-K, September 16, 2026 |
| Reportable segments | 1 (period ending June 30, 2026) | 10-K, September 16, 2026 |
| Latest proxy statement | Meeting November 17, 2026 (filed October 13, 2026) | DEF 14A, October 13, 2026 |
| Auditor | Bonadio & Co., LLP (Pittsford, New York) | Latest 10-K |
Insider trades
Open-market buys and sales by officers and directors, from Forms 4 and 5. One row per filing.
| Date | Insider | Trade | Shares | Value | Source |
|---|---|---|---|---|---|
| June 16, 2026 | Nicholas W. Zillges President and CEO | Buy | 970 | $15K | Form 4, June 17, 2026 |
| June 10, 2026 | Terry Cornish SVP and CCO | Buy | 1,389 | $20K | Form 4, June 11, 2026 |
| June 10, 2026 | Michelle Knopf EVP and COO | Buy | 1,041 | $15K | Form 4, June 11, 2026 |
| June 10, 2026 | Nicholas W. Zillges President and CEO | Buy | 1,076 | $15K | Form 4, June 11, 2026 |
| June 10, 2026 | Nora Spatz EVP and CAO | Buy | 3,819 | $55K | Form 4, June 11, 2026 |
| November 26, 2025 | Nicholas W. Zillges President and CEO | Buy | 1,075 | $12K | Form 4, November 28, 2025 |
| November 13, 2025 | Nicholas W. Zillges President and CEO | Buy | 1,325 | $15K | Form 4, November 14, 2025 |
Recent 8-K events
- 8-K filed 2026-10-01
- Item 5.02 Departure or appointment of directors or officers; compensation
- 8-K filed 2026-05-28
- Item 5.02 Departure or appointment of directors or officers; compensation
- Item 5.07 Submission of matters to a vote of security holders
- 8-K filed 2026-04-24
- Item 8.01 Other events
- 8-K filed 2025-11-18
- Item 5.07 Submission of matters to a vote of security holders
- 8-K filed 2025-04-21
- Item 8.01 Other events
- 8-K filed 2025-04-16
- Item 8.01 Other events
- 8-K filed 2025-03-31
- Item 5.07 Submission of matters to a vote of security holders
- Item 8.01 Other events
- 8-K filed 2025-03-24
- Item 8.01 Other events
- 8-K filed 2025-02-20
- Item 8.01 Other events
- 8-K filed 2025-02-18
- Item 1.01 Entry into a material definitive agreement
Frequently asked questions about Marathon Bancorp, Inc.
- What does Marathon Bancorp, Inc. do?
- In its own words, from Item 1 of its 10-K: "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."
- What is Marathon Bancorp, Inc.'s revenue?
- $11.9M for the fiscal year ending June 30, 2026, from its 10-K filed September 16, 2026.
- Is Marathon Bancorp, Inc. profitable?
- Marathon Bancorp, Inc. reported net income of $1.8M for the fiscal year ending June 30, 2026.
- How many employees does Marathon Bancorp, Inc. have?
- About 31 as of June 30, 2026, as stated in its annual report.
- Who is the CEO of Marathon Bancorp, Inc.?
- Nicholas W. Zillges, President and CEO, as named in a 4 filed June 30, 2026.
- Who is the CFO of Marathon Bancorp, Inc.?
- Joy Selting-Buchberger, SVP and CFO, as named in a 4 filed June 30, 2026.
- Where is Marathon Bancorp, Inc. headquartered?
- Wausau, WI.
- What is Marathon Bancorp, Inc.'s stock ticker?
- MBBC on Nasdaq.
- What industry is Marathon Bancorp, Inc. in?
- Savings Institutions, Not Federally Chartered, SIC code 6036.
- What is Marathon Bancorp, Inc.'s website?
- marathonbank.com. Investor relations: https://marathonbancorp.com/investor-relations/.
- When does Marathon Bancorp, Inc. report earnings next?
- November 12, 2026. Source: estimate_10q_cadence.
- Is Marathon Bancorp, Inc. a public company?
- Yes. Marathon Bancorp, Inc. files with the SEC under CIK 0001835385 and trades as MBBC.
- Who audits Marathon Bancorp, Inc.?
- Bonadio & Co., LLP, Pittsford, New York, as named in its latest annual report (10-K).
- How many shares of Marathon Bancorp, Inc. are outstanding?
- 3.0 million shares as of September 15, 2026, from its 10-K filed September 16, 2026.
- What is Marathon Bancorp, Inc.'s public float?
- $6.9M as of December 31, 2025, as reported on the cover of its 10-K filed September 16, 2026.
- How many business segments does Marathon Bancorp, Inc. report?
- 1 reportable segment for the period ending June 30, 2026, from its 10-K filed September 16, 2026.
- When is Marathon Bancorp, Inc.'s annual shareholder meeting?
- November 17, 2026, per its proxy statement (DEF 14A) filed October 13, 2026.
- Have Marathon Bancorp, Inc. insiders traded stock recently?
- Since November 13, 2025, officers and directors reported 0 open-market sales and 7 purchases worth about $146K on Forms 4 and 5. The most recent: Nicholas W. Zillges (President and CEO) bought 970 shares on June 16, 2026.