Nicholas W. Zillges - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Nicholas W. Zillges has filed 5 SEC Form 4 filings across 1 company in the last 90 days - buying. Lifetime open-market purchases: $57K.
Profile
Nicholas W. Zillges serves as President and CEO of Marathon Bancorp, Inc. (MBBC). Zillges has reported 11 insider filings with the SEC since 2025. The most recent filing was in June 2026.
| Role | President and CEO, Director |
|---|---|
| Notability | 40/100 |
Board memberships
- Marathon Bancorp, Inc. /MD/
Reported roles
- President and CEO
Trading Pattern
InsiderAlpha's records for Nicholas W. Zillges go back to 2025: 10 primary Form 4 filings, an average of 5.0 per year. The typical open-market purchase is $6K (9 buys totaling $57K). The largest single buy on record is $15K of MBBC in 2025. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Career & Filing History
Every role Nicholas W. Zillges has reported on a Form 4, reconstructed from the filings themselves - reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
- President and CEO, Director at Marathon Bancorp, Inc. /MD/ (MBBC) - 10 filings, 2025 to 2026
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-06-30 | MBBC | Marathon Bancorp, Inc. /MD/ | F - Tax withholding / forfeiture | 1.3K | $15.49 | $20K |
| 2026-06-17 | MBBC | Marathon Bancorp, Inc. /MD/ | P - Open-market purchase | 970 | $15.00 | $15K |
| 2026-06-16 | MBBC | Marathon Bancorp, Inc. /MD/ | A - Grant or award | 16.9K | $0.00 | |
| 2026-06-11 | MBBC | Marathon Bancorp, Inc. /MD/ | P - Open-market purchase | 170 | $14.75 | $3K |
| 2026-06-11 | MBBC | Marathon Bancorp, Inc. /MD/ | P - Open-market purchase | 537 | $14.50 | $8K |
| 2026-06-11 | MBBC | Marathon Bancorp, Inc. /MD/ | P - Open-market purchase | 55 | $14.24 | $783 |
| 2026-06-11 | MBBC | Marathon Bancorp, Inc. /MD/ | P - Open-market purchase | 90 | $14.25 | $1K |
| 2026-06-11 | MBBC | Marathon Bancorp, Inc. /MD/ | P - Open-market purchase | 21 | $13.77 | $289 |
| 2026-06-11 | MBBC | Marathon Bancorp, Inc. /MD/ | P - Open-market purchase | 203 | $13.75 | $3K |
| 2026-06-05 | MBBC | Marathon Bancorp, Inc. /MD/ | M - Option exercise | 1.5K | $6.48 | $10K |
| 2026-02-24 | MBBC | Marathon Bancorp, Inc. /MD/ | M - Option exercise | 3.0K | $6.48 | $19K |
| 2025-12-03 | MBBC | Marathon Bancorp, Inc. /MD/ | J - Other acquisition / disposition | 24 | $11.30 | $271 |
| 2025-12-03 | MBBC | Marathon Bancorp, Inc. /MD/ | J - Other acquisition / disposition | 634 | $11.11 | $7K |
| 2025-12-03 | MBBC | Marathon Bancorp, Inc. /MD/ | J - Other acquisition / disposition | 1.6K | $11.27 | $19K |
| 2025-11-28 | MBBC | Marathon Bancorp, Inc. /MD/ | P - Open-market purchase | 1.1K | $11.37 | $12K |
| 2025-11-14 | MBBC | Marathon Bancorp, Inc. /MD/ | P - Open-market purchase | 1.3K | $11.00 | $15K |
| 2025-06-28 | MBBC | Marathon Bancorp, Inc. /MD/ | F - Tax withholding / forfeiture | 1.2K | $9.99 | $12K |
Companies - Last 90 Days
- Marathon Bancorp, Inc. /MD/ (MBBC) - 5 filings, last 2026-06-30
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies Nicholas W. Zillges has recently filed at. Multiple unrelated insiders buying the same stock within a short window - cluster buying - has historically been one of the strongest Form 4 signals.
- Nora Spatz - $55K of MBBC open-market activity in the last 12 months
- Terry Cornish - $20K of MBBC open-market activity in the last 12 months
- Michelle Knopf - $15K of MBBC open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Novo Holdings A/S
- William O'Dowd IV
- Eric L. Oliver
- Opaleye Management Inc.
- ORBIMED ADVISORS LLC
- Stephen G. Pagliuca
- Pale Fire Capital SE
- Bhaskar Panigrahi
Frequently Asked Questions
Who is Nicholas W. Zillges?
Nicholas W. Zillges serves as President and CEO of Marathon Bancorp, Inc. (MBBC). Zillges has reported 11 insider filings with the SEC since 2025. The most recent filing was in June 2026.…
How many SEC Form 4 filings has Nicholas W. Zillges submitted recently?
5 primary Form 4 filings in the last 90 days, covering 1 company.
Has Nicholas W. Zillges been buying or selling stock?
Recorded transactions: 9 open-market purchases ($57K) and 0 open-market sales across all tracked filings.
Where can I see all of Nicholas W. Zillges's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
Learn More
Open the live Nicholas W. Zillges profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.