Marathon Bancorp, Inc. /MD/ (MBBC) Insider Trading & SEC Filings
Last SEC filing
Marathon Bancorp, Inc. /MD/ (MBBC) has filed 28 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-30. Insiders disclosed 25 open-market purchases totaling $120K. 1 Form 8-K material event filing was reported by MBBC in the last 90 days. InsiderAlpha tracks every MBBC SEC filing - Form 4, Form 144, and 8-K - in real time, including Rule 10b5-1 plan detection.
About Marathon Bancorp, Inc. /MD/ (MBBC)
Marathon Bancorp, Inc. /MD/ trades under the ticker MBBC. InsiderAlpha tracks 41 primary SEC Form 4 filings from 9 reporting insiders for MBBC since 2025, sourced directly from SEC EDGAR.
| Sector | Financials insider trading |
|---|---|
| SIC classification | Savings Institutions, Not Federally Chartered (SIC 6036) |
| SEC CIK | 0001835385 |
90-Day SEC Filing Activity
| Insider purchases (90d) | 25 ($120K) |
|---|---|
| Form 4 filings (90d) | 28 |
| Form 8-K filings (90d) | 1 |
| Latest Form 4 filing | 2026-06-30 |
Recent MBBC Insider Transactions (Form 4)
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Nicholas W. Zillges | President and CEO | F - Tax withholding / forfeiture | 1.3K | $15.49 | $20K | SEC | |
| Michelle Knopf | EVP and COO | F - Tax withholding / forfeiture | 225 | $15.49 | $3K | SEC | |
| Joy Selting-Buchberger | SVP and CFO | F - Tax withholding / forfeiture | 522 | $15.49 | $8K | SEC | |
| Terry Cornish | SVP and CCO | F - Tax withholding / forfeiture | 247 | $15.49 | $4K | SEC | |
| Nora Spatz | EVP and CAO | F - Tax withholding / forfeiture | 503 | $15.49 | $8K | SEC | |
| Nicholas W. Zillges | President and CEO | P - Open-market purchase | 970 | $15.00 | $15K | SEC | |
| Amy Zientara | Director | A - Grant or award | 3.4K | $0.00 | - | SEC | |
| Ann M. Werth | Director | A - Grant or award | 3.4K | $0.00 | - | SEC | |
| Terry Cornish | SVP and CCO | A - Grant or award | 3.5K | $0.00 | - | SEC | |
| Michelle Knopf | EVP and COO | A - Grant or award | 5.5K | $0.00 | - | SEC | |
| Nora Spatz | EVP and CAO | A - Grant or award | 6.5K | $0.00 | - | SEC | |
| Nicholas W. Zillges | President and CEO | A - Grant or award | 16.9K | $0.00 | - | SEC | |
| Timothy R. Wimmer | Director | A - Grant or award | 3.4K | $0.00 | - | SEC | |
| Thomas L. Grimm | Director | A - Grant or award | 3.4K | $0.00 | - | SEC | |
| Nora Spatz | EVP and CAO | P - Open-market purchase | 602 | $14.75 | $9K | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for Marathon Bancorp, Inc. /MD/ (MBBC). Updated in real time as new filings are submitted to the SEC.
Most-Active MBBC Insiders - Last 90 Days
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Nicholas W. Zillges | 12 | $59K |
| Nora Spatz | 12 | $73K |
| Michelle Knopf | 10 | $20K |
| Terry Cornish | 10 | $24K |
| Timothy R. Wimmer | 6 | $35K |
Recent MBBC Form 8-K Material Events
- - Item 5.02, 5.07, 9.01 [SEC]
- - Item 8.01, 9.01 · Other · neutral [SEC]
Marathon Bancorp announced a stock repurchase program authorizing the repurchase of up to 146,931 shares, representing approximately 5.0% of outstanding shares. Repurchases are expected to commence after the company releases its Q3 2026 financial results.
Recent Insider Filings
- - Terry Cornish (SVP and CCO)
- - Michelle Knopf (EVP and COO)
- - Nicholas W. Zillges (President and CEO)
- - Nora Spatz (EVP and CAO)
- - Joy Selting-Buchberger (SVP and CFO)
Form 4 Transaction Code Reference
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in MBBC insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
MBBC Insider Trading - FAQ
- What is the latest insider trade for MBBC?
- Marathon Bancorp, Inc. /MD/ (MBBC) had 28 insider filings in the last 90 days, with the most recent on 2026-06-30. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.
- How many insiders are buying MBBC stock?
- 25 insider purchases of MBBC were filed in the last 90 days, totaling $120K.
- How many insiders are selling MBBC stock?
- 0 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 tracks MBBC Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
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Learn More
- What is SEC Form 4?
- How to read insider buying signals
- Rule 10b5-1 trading plans explained
- The cluster buying signal
Open the live MBBC dashboard on InsiderAlpha for real-time alerts, charting, and full historical filing search.