Welcome to our dedicated page for Marathon Bancorp SEC filings (Ticker: MBBC), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
Digging through Marathon Bancorp’s mutual-to-stock conversion documents while also tracking its day-to-day banking metrics can feel overwhelming. The 10-K, dozens of 8-Ks, and a steady stream of Form 4 insider reports hide critical details on loan quality, deposit mix, and conversion share allocations that community-bank investors need.
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- Marathon Bancorp annual report 10-K simplified—net interest margin trends, allowance for loan losses, and branch-level deposit data.
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- Marathon Bancorp insider trading Form 4 transactions & Marathon Bancorp executive stock transactions Form 4—who’s buying during the subscription offering and why it matters.
- Marathon Bancorp earnings report filing analysis—quarter-over-quarter changes in loan originations and fee income.
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Marathon Bancorp, Inc. filed a Form S-8 to register shares under its 2022 Equity Incentive Plan and the Marathon Bank 401(k) Plan for issuance to employees and plan participants. The filing incorporates by reference the company’s Annual Report for the year ended June 30, 2025 and prior filings that describe the company’s common stock, and lists corporate documents and consents as exhibits, with certain opinions and the filing fee table filed herewith. The registrant affirms it will timely submit the 401(k) plan for IRS qualification and includes customary indemnification and power-of-attorney provisions for officers to effect the registration.
Marathon Bancorp, Inc. (MBBC) annual report highlights operations as a community bank focused on lending and deposit services. The company reports 2,938,698 shares outstanding and completed a conversion with a 1.3728-to-1 exchange ratio, priced at $10.00 per share when it began trading on Nasdaq as MBBC. The ESOP received loans combined into a $2.1 million term loan repayable through 2049 and 231,528 shares remain unreleased with a market value of ~$2.31 million at June 30, 2025. Eligible collateral pledged to FHLB was $70.6 million at June 30, 2025 (compared with $92.2 million a year earlier) and FHLB stock pledged was $1,329,413. A foreclosed property previously valued at $2.3 million was adjusted to $1.4 million with a $937,100 valuation allowance in 2024; an accepted $1.1 million sale offer in August 2025 led to a $378,767 allowance in 2025, sale not closed as of Sept 26, 2025. The bank exercised the AOCI opt-out for regulatory capital purposes.
Marathon Bank Employee Stock Ownership Plan Trust reports beneficial ownership of 254,445 shares of Marathon Bancorp common stock, representing 8.66% of the outstanding class. The filing shows the trust has sole dispositive power over all 254,445 shares and sole voting power for 236,254 shares with shared voting power for 18,191 shares. The trustee is Community Bank of Pleasant Hill, operating as First Trust of MidAmerica. The reporting person identifies itself as an employee benefit plan and certifies the shares are held in the ordinary course of business and not to influence control of the issuer.
Marathon Bancorp, Inc. (MBBC) – Form 4/A insider filing: President & CEO Nicholas W. Zillges reported a Code F transaction on 06/28/2025, indicating that 1,169 common shares were withheld by the company at $9.99 per share (≈ $11.7 k) to satisfy tax obligations on previously-granted restricted stock that vested the same day. No open-market purchase or sale occurred.
After the withholding, Zillges directly owns 32,403 common shares and indirectly controls an additional 51,107 shares through a 401(k), IRA, and ESOP. The filing also reiterates outstanding option awards (29,994 options at $8.1294 expiring 2032 and 7,498 options at $6.4831 expiring 2033), both vesting 20 % annually. This amended filing (originally dated 07/01/2025) appears to update or clarify share counts; there are no new option grants or disposals beyond the tax-related share withholding. Overall, the event is routine and does not materially alter insider ownership or signal a change in strategic outlook.
Marathon Bancorp, Inc. (MBBC) – Insider Form 4 filing
SVP & CFO Joy Selting-Buchberger reported a routine Code F transaction dated 28 June 2025, indicating 517 common shares were withheld at $9.99 (≈ $5.2 k) to satisfy tax obligations on recently-vesting restricted stock. No open-market sale occurred.
Post-withholding, the executive directly owns 5,338 common shares; indirect holdings include 21,788 shares through the 401(k) and 1,264 shares via the ESOP. In addition, she holds 10,803 vested/unvested stock options at exercise prices of $8.1294 and $6.4831 that vest 20 % annually through 2033.
The filing shows ongoing alignment between the CFO and shareholders via meaningful equity exposure, while the small tax-related disposition is unlikely to influence the float or signal a change in sentiment.
Marathon Bancorp (MBBC) – insider Form 4 filing
On 28 June 2025, SVP & Chief Credit Officer Terry Cornish satisfied tax-withholding obligations by having 225 common shares withheld at $9.99 each (Transaction Code F). Following the transaction, his direct holdings stand at 3,044 shares, while indirect ownership remains at 25,816 shares via the 401(k) and 1,478 shares through the ESOP.
The filing also reiterates previously granted stock-option awards—4,498 options (exercise $8.1294, exp. 2032) and 4,804 options (exercise $6.4831, exp. 2033)—with no new grants or exercises reported. Overall, the activity is routine, involves a de-minimis dollar amount (~$2.3 k) relative to market cap, and is unlikely to influence the investment thesis.
Form 4 Filing – Marathon Bancorp, Inc. (MBBC) – 28 June 2025
President & CEO Nicholas W. Zillges reported a single Code F transaction, indicating the disposition of 1,196 common shares at $9.99 to cover taxes associated with previously granted equity awards. Following the withholding, Zillges directly owns 32,376 common shares. He also maintains indirect ownership of 47,780 shares through a 401(k), 604 shares in an IRA, and 2,723 shares via the ESOP.
No open-market purchases or sales were reported. The filing also lists outstanding stock options—29,994 options (exercise price $8.1294, expiring 2032) and 7,498 options (exercise price $6.4831, expiring 2033)—both vesting 20 % annually. These positions are disclosures only; no option exercises occurred.
Given the limited size (≈ $12k) and tax-withholding nature of the share disposition, the event is considered routine and unlikely to materially influence MBBC’s valuation or trading dynamics.
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