Marathon Bancorp Inc.
Last updated September 27, 2026
Organization details
- Legal name
- Marathon Bancorp Inc.
- Ownership
- Public
- Status
- Active
- SIC code
- 6036 — Savings Institutions, Not Federally Chartered
- Headquarters city
- Wausau
- Headquarters state / province
- Wisconsin
- Headquarters country
- United States
- Fiscal year end
- June
- Ticker symbol
- MBBC
- Primary stock exchange
- Nasdaq
Identifiers
- SEC CIK
- 0001835385
- EIN
- 86-2191258
Board of directors
-
Amy Zientara · DirectorSince 2023
-
Ann M. Werth · DirectorSince 2023
-
Nicholas W. Zillges · Director · President and CEOSince 2023
-
Thomas L. Grimm · DirectorSince 2023
-
Timothy R. Wimmer · DirectorSince 2023
Chief executives
Nicholas W. Zillges
· President and CEO
Dates unknown
Director election results
Annual meeting of November 18, 2025. Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
81.5%
-
92.1%
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
- Bought, last 12 months
- $146,455
- 27 purchases by 4 insiders
- Sold, last 12 months
- $0
- 0 sales by 0 insiders
| Date | Insider | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Sep 18, 2026 | Spatz Nora Officer (EVP and CAO) | Option exercise | +1,201 | $8.13 | $9,764 |
| Sep 18, 2026 | Spatz Nora Officer (EVP and CAO) | Option exercise | +962 | $6.48 | $6,234 |
| Jun 28, 2026 | Cornish Terry Officer (SVP and CCO) | Shares withheld for tax | −247 | $15.49 | $3,826 |
| Jun 28, 2026 | Knopf Michelle Officer (EVP and COO) | Shares withheld for tax | −225 | $15.49 | $3,485 |
| Jun 28, 2026 | Nicholas W. Zillges Director, Officer (President and CEO) | Shares withheld for tax | −1,269 | $15.49 | $19,657 |
| Jun 28, 2026 | Spatz Nora Officer (EVP and CAO) | Shares withheld for tax | −503 | $15.49 | $7,791 |
| Jun 28, 2026 | Selting-Buchberger Joy Officer (SVP and CFO) | Shares withheld for tax | −522 | $15.49 | $8,086 |
| Jun 16, 2026 | Nicholas W. Zillges Director, Officer (President and CEO) | Open-market purchase | +970 | $15.00 | $14,550 |
| Jun 15, 2026 | Ann M. Werth Director | Grant or award | +3,386 | — | — |
| Jun 15, 2026 | Timothy R. Wimmer Director | Grant or award | +3,386 | — | — |
| Jun 15, 2026 | Thomas L. Grimm Director | Grant or award | +3,386 | — | — |
| Jun 15, 2026 | Amy Zientara Director, Chairwoman of the Board | Grant or award | +3,386 | — | — |
| Jun 15, 2026 | Cornish Terry Officer (SVP and CCO) | Grant or award | +3,500 | — | — |
| Jun 15, 2026 | Knopf Michelle Officer (EVP and COO) | Grant or award | +5,450 | — | — |
| Jun 15, 2026 | Nicholas W. Zillges Director, Officer (President and CEO) | Grant or award | +16,934 | — | — |
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