MBBC · Insider Trading
Marathon Bancorp, Inc. Common Stock
Every open-market purchase and sale reported by MBBC officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-18 | Nora Spatz | EVP and CAO | M | +2,163 | +$16.00K |
| 2026-06-17 | Nicholas W Zillges | President and CEO | Buy | +970 | +$14.55K |
| 2026-06-16 | Timothy R Wimmer | Director | A | +3,386 | — |
| 2026-06-16 | Michelle Knopf | EVP and COO | A | +5,450 | — |
| 2026-06-16 | Terry Cornish | SVP and CCO | A | +3,500 | — |
| 2026-06-16 | Nora Spatz | EVP and CAO | A | +6,450 | — |
| 2026-06-16 | Ann M Werth | Director | A | +3,386 | — |
| 2026-06-16 | Thomas L Grimm | Director | A | +3,386 | — |
| 2026-06-16 | Amy Zientara | Director | A | +3,386 | — |
| 2026-06-16 | Nicholas W Zillges | President and CEO | A | +16,934 | — |
| 2026-06-11 | Nora Spatz | EVP and CAO | Buy | +3,819 | +$54.80K |
| 2026-06-11 | Nicholas W Zillges | President and CEO | Buy | +1,076 | +$15.44K |
| 2026-06-11 | Michelle Knopf | EVP and COO | Buy | +1,041 | +$14.94K |
| 2026-06-11 | Terry Cornish | SVP and CCO | Buy | +1,389 | +$19.93K |
| 2026-06-05 | Thomas L Grimm | Director | M | +300 | +$1.94K |
| 2026-06-05 | Nicholas W Zillges | President and CEO | M | +1,500 | +$9.72K |
| 2026-06-05 | Timothy R Wimmer | Director | M | +4,498 | +$35.09K |
| 2026-06-05 | Amy Zientara | Director | M | +4,498 | +$35.09K |
| 2026-06-05 | Nora Spatz | EVP and CAO | M | +1,200 | +$9.76K |
| 2026-05-19 | Nora Spatz | EVP and CAO | F | −30 | −$435 |
| 2026-05-19 | Terry Cornish | SVP and CCO | F | −41 | −$594 |
| 2026-05-19 | Michelle Knopf | EVP and COO | F | −86 | −$1.25K |
| 2026-05-19 | Joy Selting-Buchberger | SVP and CFO | F | −56 | −$812 |
| 2026-05-06 | Ann M Werth | Director | M | +1,498 | +$11.19K |
| 2026-03-20 | Thomas L Grimm | Director | M | +4,198 | +$33.14K |
| 2026-03-18 | Nora Spatz | EVP and CAO | M | +4,320 | +$31.95K |
| 2026-02-24 | Nicholas W Zillges | President and CEO | M | +2,998 | +$19.43K |
| 2025-12-03 | Michelle Knopf | EVP and COO | I | +1,949 | +$21.88K |
| 2025-12-03 | Nicholas W Zillges | President and CEO | I | +2,304 | +$25.86K |
| 2025-12-03 | Nora Spatz | EVP and CAO | I | +4,431 | +$49.73K |
| 2025-11-28 | Nicholas W Zillges | President and CEO | Buy | +1,075 | +$12.22K |
| 2025-11-14 | Nicholas W Zillges | President and CEO | Buy | +1,325 | +$14.57K |
| 2025-07-02 | Nicholas W Zillges | President and CEO | F | −1,169 | −$11.68K |
| 2025-07-01 | Nora Spatz | EVP and CAO | F | −451 | −$4.51K |
| 2025-07-01 | Terry Cornish | SVP and CCO | F | −225 | −$2.25K |
| 2025-07-01 | Michelle Knopf | EVP and COO | F | −197 | −$1.97K |
| 2025-07-01 | Nicholas W Zillges | President and CEO | F | −1,196 | −$11.95K |
| 2025-07-01 | Joy Selting-Buchberger | SVP and CFO | F | −517 | −$5.16K |
| 2025-06-16 | Nicholas W Zillges | President and CEO | Buy | +500 | +$5.00K |
| 2025-06-03 | Nicholas W Zillges | President and CEO | I | +695 | +$6.96K |
| 2025-06-03 | Nora Spatz | EVP and CAO | I | +992 | +$9.93K |
| 2025-05-20 | Nicholas W Zillges | President and CEO | Buy | +500 | +$5.03K |
| 2025-05-20 | Michelle Knopf | EVP and COO | F | −70 | −$702 |
| 2025-05-20 | Terry Cornish | SVP and CCO | F | −38 | −$381 |
| 2025-05-20 | Nora Spatz | EVP and CAO | F | −29 | −$291 |
| 2025-05-20 | Joy Selting-Buchberger | SVP and CFO | F | −44 | −$441 |
| 2025-04-22 | Thomas L Grimm | Director | A | +7,500 | +$75.00K |
| 2025-04-22 | Nicholas W Zillges | President and CEO | A | +10,000 | +$100.00K |
| 2025-04-22 | Ann M Werth | Director | A | +550 | +$5.50K |
| 2025-04-22 | Amy Zientara | Director | A | +2,500 | +$25.00K |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Nicholas W Zillges | President and CEO | 108,365 | $1.57M |
| Nora Spatz | EVP and CAO | 30,857 | $447.43K |
| Thomas L Grimm | Director | 28,678 | $415.83K |
| Michelle Knopf | EVP and COO | 28,121 | $407.75K |
| Amy Zientara | Director | 27,110 | $393.10K |
| Timothy R Wimmer | Director | 20,246 | $293.57K |
| Terry Cornish | SVP and CCO | 8,753 | $126.92K |
| Ann M Werth | Director | 8,501 | $123.26K |
| Joy Selting-Buchberger | SVP and CFO | 6,546 | $94.92K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the MBBC quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.