Marathon Bancorp, Inc. /MD/ (MBBC)
Data as of , from SEC Form 4 filings.
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About Marathon Bancorp, Inc. /MD/ (MBBC)
Marathon Bancorp Inc is a mid-tier holding company for Marathon Bank, a Wisconsin-chartered savings bank, operating as a community-oriented bank offering financial products and services. Its primary deposit products include demand deposits, savings, and certificates of deposit, while its lending products include commercial real estate, commercial and industrial, construction, one-to-four-family residential, multifamily real estate, and consumer loans. The majority of its revenue comes from interest income on loans and debt securities.
- WAUSAU, WI
- 31
- 2021
- Nasdaq
https://www.marathonbancorp.comSEC filings for MBBC on EDGAR
MBBC Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Option exercise | 4 | 4,326 |
Dollar totals cover purchases and sales only (codes P and S). Grants, option exercises, gifts and tax withholding are counted in shares, because none of them is a trade at a market price.
MBBC insider transactions (Form 4)
7642 Form 4 filings on record, the earliest from Jun 28, 2025, newest first. Filing history page 1 of 2.
| Traded | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Nora Spatz - Officer | Option exercise | Common Stock | 1,201 | $8.13 | $10K | |
| Nora Spatz - Officer | Option exercise | Common Stock | 962 | $6.48 | $6K | |
| Nora Spatz - Officer | Option exercise | Stock Options | 1,201 | $0.00 | - | |
| Nora Spatz - Officer | Option exercise | Stock Options | 962 | $0.00 | - | |
| Terry Cornish - Officer | Tax withholding / forfeiture | Common Stock | 247 | $15.49 | $4K | |
| Michelle Knopf - Officer | Tax withholding / forfeiture | Common Stock | 225 | $15.49 | $3K | |
| Nicholas W. Zillges - Officer | Tax withholding / forfeiture | Common Stock | 1,269 | $15.49 | $20K | |
| Nora Spatz - Officer | Tax withholding / forfeiture | Common Stock | 503 | $15.49 | $8K | |
| Joy Selting-Buchberger - Officer | Tax withholding / forfeiture | Common Stock | 522 | $15.49 | $8K | |
| Nicholas W. Zillges - Officer | Open-market purchase | Common Stock | 970 | $15.00 | $15K | |
 Ann M. Werth - Director | Grant or award | Stock Options | 8,467 footnote F4 | $0.00 | - | |
| Ann M. Werth - Director | Grant or award | Common Stock | 3,386 footnote F1 | $0.00 | - | |
| ||||||
| Timothy R. Wimmer - Director | Grant or award | Common Stock | 3,386 footnote F1 | $0.00 | - | |
| Timothy R. Wimmer - Director | Grant or award | Stock Options | 8,467 footnote F3 | $0.00 | - | |
| ||||||
| Thomas L. Grimm - Director | Grant or award | Common Stock | 3,386 footnote F1 | $0.00 | - | |
| Thomas L. Grimm - Director | Grant or award | Stock Options | 8,467 footnote F3 | $0.00 | - | |
| ||||||
 Amy Zientara - Director | Grant or award | Common Stock | 3,386 footnote F1 | $0.00 | - | |
| Amy Zientara - Director | Grant or award | Stock Options | 8,467 footnote F3 | $0.00 | - | |
| ||||||
| Terry Cornish - Officer | Grant or award | Common Stock | 3,500 footnote F1 | $0.00 | - | |
| Terry Cornish - Officer | Grant or award | Stock Options | 7,000 footnote F4 | $0.00 | - | |
| ||||||
| Michelle Knopf - Officer | Grant or award | Common Stock | 5,450 footnote F1 | $0.00 | - | |
| Michelle Knopf - Officer | Grant or award | Stock Options | 10,000 footnote F4 | $0.00 | - | |
| ||||||
| Nicholas W. Zillges - Officer | Grant or award | Stock Options | 42,335 footnote F3 | $0.00 | - | |
| Nicholas W. Zillges - Officer | Grant or award | Common Stock | 16,934 footnote F1 | $0.00 | - | |
| ||||||
| Nora Spatz - Officer | Grant or award | Common Stock | 6,450 footnote F1 | $0.00 | - | |
| Nora Spatz - Officer | Grant or award | Stock Options | 11,000 footnote F4 | $0.00 | - | |
| ||||||
| Terry Cornish - Officer | Open-market purchase | Common Stock | 27 | $13.77 footnote F2 | $372 | |
| Terry Cornish - Officer | Open-market purchase | Common Stock | 116 | $14.25 footnote F3 | $2K | |
| Terry Cornish - Officer | Open-market purchase | Common Stock | 71 | $14.24 footnote F4 | $1K | |
| Terry Cornish - Officer | Open-market purchase | Common Stock | 693 | $14.50 | $10K | |
| Terry Cornish - Officer | Open-market purchase | Common Stock | 219 | $14.75 | $3K | |
| Terry Cornish - Officer | Open-market purchase | Common Stock | 263 | $13.75 footnote F1 | $4K | |
| ||||||
| Michelle Knopf - Officer | Open-market purchase | Common Stock | 54 | $14.24 footnote F4 | $769 | |
| Michelle Knopf - Officer | Open-market purchase | Common Stock | 519 | $14.50 | $8K | |
| Michelle Knopf - Officer | Open-market purchase | Common Stock | 164 | $14.75 | $2K | |
| Michelle Knopf - Officer | Open-market purchase | Common Stock | 197 | $13.75 footnote F1 | $3K | |
| Michelle Knopf - Officer | Open-market purchase | Common Stock | 20 | $13.77 footnote F2 | $275 | |
| Michelle Knopf - Officer | Open-market purchase | Common Stock | 87 | $14.25 footnote F3 | $1K | |
| ||||||
| Nicholas W. Zillges - Officer | Open-market purchase | Common Stock | 55 | $14.24 footnote F4 | $783 | |
| Nicholas W. Zillges - Officer | Open-market purchase | Common Stock | 537 | $14.50 | $8K | |
| Nicholas W. Zillges - Officer | Open-market purchase | Common Stock | 170 | $14.75 | $3K | |
| Nicholas W. Zillges - Officer | Open-market purchase | Common Stock | 203 | $13.75 footnote F1 | $3K | |
| Nicholas W. Zillges - Officer | Open-market purchase | Common Stock | 21 | $13.77 footnote F2 | $289 | |
| Nicholas W. Zillges - Officer | Open-market purchase | Common Stock | 90 | $14.25 footnote F3 | $1K | |
| ||||||
| Nora Spatz - Officer | Open-market purchase | Common Stock | 722 | $13.75 footnote F1 | $10K | |
| Nora Spatz - Officer | Open-market purchase | Common Stock | 74 | $13.77 footnote F2 | $1K | |
| Nora Spatz - Officer | Open-market purchase | Common Stock | 320 | $14.25 footnote F3 | $5K | |
| Nora Spatz - Officer | Open-market purchase | Common Stock | 197 | $14.24 footnote F4 | $3K | |
| Nora Spatz - Officer | Open-market purchase | Common Stock | 602 | $14.75 | $9K | |
| Nora Spatz - Officer | Open-market purchase | Common Stock | 1,904 | $14.50 | $28K | |
| ||||||
| Amy Zientara - Director | Option exercise | Common Stock | 3,599 | $8.13 | $29K | |
| Amy Zientara - Director | Option exercise | Common Stock | 899 | $6.48 | $6K | |
| Amy Zientara - Director | Option exercise | Stock Options | 3,599 | $0.00 | - | |
| Amy Zientara - Director | Option exercise | Stock Options | 899 | $0.00 | - | |
| Nora Spatz - Officer | Option exercise | Common Stock | 1,200 | $8.13 | $10K | |
| Nora Spatz - Officer | Option exercise | Stock Options | 1,200 | $0.00 | - | |
| Nicholas W. Zillges - Officer | Option exercise | Common Stock | 1,500 | $6.48 | $10K | |
| Nicholas W. Zillges - Officer | Option exercise | Stock Options | 1,500 | $0.00 | - | |
| Thomas L. Grimm - Director | Option exercise | Stock Options | 300 | $0.00 | - | |
| Thomas L. Grimm - Director | Option exercise | Common Stock | 300 | $6.48 | $2K | |
| Timothy R. Wimmer - Director | Option exercise | Common Stock | 3,599 | $8.13 | $29K | |
| Timothy R. Wimmer - Director | Option exercise | Common Stock | 899 | $6.48 | $6K | |
| Timothy R. Wimmer - Director | Option exercise | Stock Options | 3,599 | $0.00 | - | |
| Timothy R. Wimmer - Director | Option exercise | Stock Options | 899 | $0.00 | - | |
| Terry Cornish - Officer | Tax withholding / forfeiture | Common Stock | 41 | $14.50 | $595 | |
| Joy Selting-Buchberger - Officer | Tax withholding / forfeiture | Common Stock | 56 | $14.50 | $812 | |
| Nora Spatz - Officer | Tax withholding / forfeiture | Common Stock | 30 | $14.50 | $435 | |
| Michelle Knopf - Officer | Tax withholding / forfeiture | Common Stock | 86 | $14.50 | $1K | |
| Ann M. Werth - Director | Option exercise | Common Stock | 899 | $8.13 | $7K | |
| Ann M. Werth - Director | Option exercise | Common Stock | 599 | $6.48 | $4K | |
| Ann M. Werth - Director | Option exercise | Stock Options | 899 | $0.00 | - | |
| Ann M. Werth - Director | Option exercise | Stock Options | 599 | $0.00 | - | |
| Thomas L. Grimm - Director | Option exercise | Common Stock | 3,599 | $8.13 | $29K | |
| Thomas L. Grimm - Director | Option exercise | Common Stock | 599 | $6.48 | $4K | |
| Thomas L. Grimm - Director | Option exercise | Stock Options | 0 | $0.00 | - | |
| Thomas L. Grimm - Director | Option exercise | Stock Options | 0 | $0.00 | - | |
Item 5.02
Item 5.02, 5.07, 9.01
Item 8.01, 9.01
MBBC insider trading FAQ
What is the latest insider trade for MBBC?
Marathon Bancorp, Inc. /MD/ (MBBC) had 1 insider filing in the last 90 days, with the most recent on 18 September 2026. The full record for MBBC runs to 42 Form 4 filings, the earliest from 28 June 2025. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying MBBC stock?
No insider purchases of MBBC were filed in the last 90 days. 27 purchases are on record for this company.
How many insiders are selling MBBC stock?
No insider sales of MBBC were filed in the last 90 days.
Where can I see MBBC SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects MBBC Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Financials companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Nora Spatz view on EDGAR
- - Terry Cornish view on EDGAR
- - Michelle Knopf view on EDGAR
- - Nicholas W. Zillges view on EDGAR
- - Nora Spatz view on EDGAR
- - Joy Selting-Buchberger view on EDGAR
- - Nicholas W. Zillges view on EDGAR
- - Ann M. Werth view on EDGAR
- - Timothy R. Wimmer view on EDGAR
Related companies with recent insider activity
Learn more
- What the Form 4 transaction codes mean
- Grants, option exercises, gifts and tax withholding are not trades on the market. The codes say which is which.
- Insider activity in Financials
- Where MBBC's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
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