Nasdaq · CIK 0001835385
MBBC Marathon Bancorp, Inc. /MD/
Insider trading from SEC Form 4. Last filing 25 d ago. Close $15.10 on Oct 9, 2026, +44% from the 52-week low and -3% from the high.
Marathon Bancorp, Inc. /MD/ (MBBC) has 38 SEC Form 4 filings on file from 6 insiders, the latest filed on Sep 18, 2026. No insider bought or sold on the open market in the last 90 days; rows filed in that time are grants, exercises, tax withholding and other transactions that carry no view on the price.
5 open-market trades have been scored at MBBC. The newest: Terry Cornish (SVP and CCO) bought $20k of stock on Jun 3, 2026, filed Jun 11, 2026, scored 18 (weak).
MBBC closed at $15.10 on Oct 9, 2026, 44% above its 52-week low and 3% below its 52-week high.
Last 90 days
Price and insider trades, last year
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
Open-market buys and sells at Marathon Bancorp, Inc. /MD/, scored.
| Score | Insider | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 18Weak | Terry Cornish SVP and CCO buy | $20k 1,389 shares | +5% | +39% from low-11% from high | |
| 30Weak | Nicholas W Zillges President and CEO buy | $12k 1,075 shares | +3% | - | |
| 25Weak | Nicholas W Zillges President and CEO buy | $15k 1,325 shares | +4% | - | |
| 30Weak | Nicholas W Zillges President and CEO buy | $4,995 500 shares | +2% | - | |
| 25Weak | Nicholas W Zillges President and CEO buy | $5,034 500 shares | +2% | - |
Transactions
The newest 50 of 65 rows filed, every code.
| Date | Insider | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 18, 2026 | Nora Spatz EVP and CAO | MOption exercise Common Stock | +1,201 | $8.13 | $9,764 | 28,297 | 25 d ago |
| Sep 18, 2026 | Nora Spatz EVP and CAO | MOption exercise Common Stock | +962 | $6.48 | $6,234 | 29,259 | 25 d ago |
| Sep 18, 2026 | Nora Spatz EVP and CAO | MOption exercise Stock Optionsderivative | -1,201 | $0.00 | $0 | 1,199 | 25 d ago |
| Sep 18, 2026 | Nora Spatz EVP and CAO | MOption exercise Stock Optionsderivative | -962 | $0.00 | $0 | 1,921 | 25 d ago |
| Jun 28, 2026 | Terry Cornish SVP and CCO | FTax withholding Common Stock | -247 | $15.49 | $3,826 | 6,256 | Jun 30, 2026 |
| Jun 15, 2026 | Terry Cornish SVP and CCO | AGrant or award Common Stock | +3,500 | $0.00 | $0 | 6,503 | Jun 16, 2026 |
| Jun 15, 2026 | Thomas L Grimm director | AGrant or award Common Stock | +3,386 | $0.00 | $0 | 6,384 | Jun 16, 2026 |
| Jun 15, 2026 | Thomas L Grimm director | AGrant or award Stock Optionsderivative | +8,467 | $0.00 | $0 | 8,467 | Jun 16, 2026 |
| Jun 15, 2026 | Terry Cornish SVP and CCO | AGrant or award Stock Optionsderivative | +7,000 | $0.00 | $0 | 7,000 | Jun 16, 2026 |
| Jun 3, 2026 | Terry Cornish SVP and CCO | POpen-market purchase Common Stockindirect: By 401(k) | +263 | $13.75 | $3,616 | 26,079 | Jun 11, 2026 |
| Jun 4, 2026 | Terry Cornish SVP and CCO | POpen-market purchase Common Stockindirect: By 401(k) | +27 | $13.77 | $372 | 26,106 | Jun 11, 2026 |
| Jun 5, 2026 | Terry Cornish SVP and CCO | POpen-market purchase Common Stockindirect: By 401(k) | +116 | $14.25 | $1,653 | 26,222 | Jun 11, 2026 |
| Jun 8, 2026 | Terry Cornish SVP and CCO | POpen-market purchase Common Stockindirect: By 401(k) | +71 | $14.24 | $1,011 | 26,293 | Jun 11, 2026 |
| Jun 9, 2026 | Terry Cornish SVP and CCO | POpen-market purchase Common Stockindirect: By 401(k) | +693 | $14.50 | $10k | 26,986 | Jun 11, 2026 |
| Jun 10, 2026 | Terry Cornish SVP and CCO | POpen-market purchase Common Stockindirect: By 401(k) | +219 | $14.75 | $3,230 | 27,205 | Jun 11, 2026 |
| Jun 3, 2026 | Thomas L Grimm director | MOption exercise Common Stockindirect: By Trust | +300 | $6.48 | $1,944 | 22,294 | Jun 5, 2026 |
| Jun 3, 2026 | Thomas L Grimm director | MOption exercise Stock Optionsderivative | -300 | $0.00 | $0 | 600 | Jun 5, 2026 |
| May 16, 2026 | Terry Cornish SVP and CCO | FTax withholding Common Stock | -41 | $14.50 | $595 | 3,003 | May 19, 2026 |
| Mar 20, 2026 | Thomas L Grimm director | MOption exercise Common Stockindirect: By Trust | +3,599 | $8.13 | $29k | 21,395 | Mar 20, 2026 |
| Mar 20, 2026 | Thomas L Grimm director | MOption exercise Common Stockindirect: By Trust | +599 | $6.48 | $3,882 | 21,994 | Mar 20, 2026 |
| Mar 20, 2026 | Thomas L Grimm director | MOption exercise Stock Optionsderivative | - | $0.00 | - | 2,400 | Mar 20, 2026 |
| Mar 20, 2026 | Thomas L Grimm director | MOption exercise Stock Optionsderivative | - | $0.00 | - | 900 | Mar 20, 2026 |
| Mar 18, 2026 | Nora Spatz EVP and CAO | MOption exercise Common Stock | +2,399 | $8.13 | $20k | 18,058 | Mar 18, 2026 |
| Mar 18, 2026 | Nora Spatz EVP and CAO | MOption exercise Common Stock | +1,921 | $6.48 | $12k | 19,979 | Mar 18, 2026 |
| Mar 18, 2026 | Nora Spatz EVP and CAO | MOption exercise Stock Optionsderivative | -2,399 | $0.00 | $0 | 3,600 | Mar 18, 2026 |
| Mar 18, 2026 | Nora Spatz EVP and CAO | MOption exercise Stock Optionsderivative | -1,921 | $0.00 | $0 | 2,883 | Mar 18, 2026 |
| Feb 23, 2026 | Nicholas W Zillges President and CEO | MOption exercise Common Stock | +2,998 | $6.48 | $19k | 37,801 | Feb 24, 2026 |
| Feb 23, 2026 | Nicholas W Zillges President and CEO | MOption exercise Stock Optionsderivative | -2,998 | $0.00 | $0 | 4,500 | Feb 24, 2026 |
| Dec 1, 2025 | Michelle Knopf EVP and COO | IDiscretionary transaction Common Stockindirect: By 401(k) | +1,393 | $11.27 | $16k | 17,742 | Dec 3, 2025 |
| Dec 1, 2025 | Nicholas W Zillges President and CEO | IDiscretionary transaction Common Stockindirect: By 401(k) | +1,646 | $11.27 | $19k | 49,426 | Dec 3, 2025 |
| Dec 1, 2025 | Nora Spatz EVP and CAO | IDiscretionary transaction Common Stockindirect: By 401(k) | +3,166 | $11.27 | $36k | 34,436 | Dec 3, 2025 |
| Dec 2, 2025 | Nora Spatz EVP and CAO | IDiscretionary transaction Common Stockindirect: By 401(k) | +1,220 | $11.11 | $14k | 35,656 | Dec 3, 2025 |
| Dec 2, 2025 | Michelle Knopf EVP and COO | IDiscretionary transaction Common Stockindirect: By 401(k) | +536 | $11.11 | $5,955 | 18,278 | Dec 3, 2025 |
| Dec 2, 2025 | Nicholas W Zillges President and CEO | IDiscretionary transaction Common Stockindirect: By 401(k) | +634 | $11.11 | $7,044 | 50,060 | Dec 3, 2025 |
| Dec 2, 2025 | Nicholas W Zillges President and CEO | IDiscretionary transaction Common Stockindirect: By 401(k) | +24 | $11.30 | $271 | 50,084 | Dec 3, 2025 |
| Dec 2, 2025 | Nora Spatz EVP and CAO | IDiscretionary transaction Common Stockindirect: By 401(k) | +45 | $11.30 | $509 | 35,701 | Dec 3, 2025 |
| Dec 2, 2025 | Michelle Knopf EVP and COO | IDiscretionary transaction Common Stockindirect: By 401(k) | +20 | $11.30 | $226 | 18,298 | Dec 3, 2025 |
| Nov 26, 2025 | Nicholas W Zillges President and CEO | POpen-market purchase Common Stock | +1,075 | $11.37 | $12k | 34,803 | Nov 28, 2025 |
| Nov 13, 2025 | Nicholas W Zillges President and CEO | POpen-market purchase Common Stock | +1,325 | $11.00 | $15k | 33,728 | Nov 14, 2025 |
| Jun 28, 2025 | Nicholas W Zillges President and CEO | FTax withholding Common Stock | -1,169 | $9.99 | $12k | 32,403 | Jul 2, 2025 |
| Jun 28, 2025 | Terry Cornish SVP and CCO | FTax withholding Common Stock | -225 | $9.99 | $2,248 | 3,044 | Jul 1, 2025 |
| Jun 28, 2025 | Michelle Knopf EVP and COO | FTax withholding Common Stock | -197 | $9.99 | $1,968 | 3,418 | Jul 1, 2025 |
| Jun 28, 2025 | Nicholas W Zillges President and CEO | FTax withholding Common Stock | -1,196 | $9.99 | $12k | 32,376 | Jul 1, 2025 |
| Jun 28, 2025 | Nora Spatz EVP and CAO | FTax withholding Common Stock | -451 | $9.99 | $4,505 | 15,659 | Jul 1, 2025 |
| Jun 28, 2025 | Joy Selting-Buchberger SVP and CFO | FTax withholding Common Stock | -517 | $9.99 | $5,165 | 5,338 | Jul 1, 2025 |
| Jun 13, 2025 | Nicholas W Zillges President and CEO | POpen-market purchase Common Stock | +500 | $9.99 | $4,995 | 33,572 | Jun 16, 2025 |
| May 29, 2025 | Nora Spatz EVP and CAO | IDiscretionary transaction Common Stockindirect: By 401(k) | +992 | $10.01 | $9,930 | 31,270 | Jun 3, 2025 |
| May 29, 2025 | Nicholas W Zillges President and CEO | IDiscretionary transaction Common Stockindirect: By 401(k) | +695 | $10.01 | $6,957 | 47,780 | Jun 3, 2025 |
| May 16, 2025 | Terry Cornish SVP and CCO | FTax withholding Common Stock | -38 | $10.03 | $381 | 3,269 | May 20, 2025 |
| May 16, 2025 | Michelle Knopf EVP and COO | FTax withholding Common Stock | -70 | $10.03 | $702 | 3,615 | May 20, 2025 |
Insiders
Everyone who has filed a Form 4 here.
- Terry CornishSVP and CCO
- Thomas L Grimmdirector
- Michelle KnopfEVP and COO
- Joy Selting-BuchbergerSVP and CFO
- Nora SpatzEVP and CAO
- Nicholas W ZillgesPresident and CEO
Questions about MBBC
Answered from the filings on this page, as of the latest one.
Are insiders buying MBBC?
No. In the last 90 days no insider at Marathon Bancorp, Inc. /MD/ bought or sold shares on the open market according to SEC Form 4 filings. The rows on file from that period are grants, exercises, tax withholding or other transactions, which carry no view on the price.
Who was the last insider to trade MBBC on the open market?
Terry Cornish (SVP and CCO) bought $20k of MBBC on Jun 3, 2026 and filed the Form 4 on Jun 11, 2026. InsiderTell scored 18 (weak).
How many insiders file Form 4 at Marathon Bancorp, Inc. /MD/?
6 people have filed a Form 4 at Marathon Bancorp, Inc. /MD/, among them Terry Cornish (SVP and CCO), Thomas L Grimm (director), Michelle Knopf (EVP and COO). Officers, directors and holders of more than 10% of a share class must report their trades within two business days.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.