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Marathon Bancorp (MBBC) CEO adds 970 shares in open-market purchase

Filing Impact
(Neutral)
Filing Sentiment
(Positive)
Form Type
4

Rhea-AI Filing Summary

Marathon Bancorp, Inc. President and CEO Nicholas W. Zillges reported an open-market purchase of 970 shares of common stock at $15.00 per share on June 16, 2026, increasing his direct ownership to 57,205 shares.

He also reports indirect holdings of 4,429 shares by an ESOP, 604 shares by an IRA, and 51,160 shares by a 401(k). In addition, he holds stock options on 42,335 shares at $14.55 per share expiring on June 15, 2036, 3,000 shares at $6.48 expiring on May 16, 2033, and 29,994 shares at $8.13 expiring on June 28, 2032, with related vesting schedules described in the filing.

Positive

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Negative

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Insider Zillges Nicholas W
Role President and CEO
Bought 970 shs ($15K)
Type Security Shares Price Value
Purchase Common Stock 970 $15.00 $15K
holding Stock Options -- -- --
holding Stock Options -- -- --
holding Stock Options -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 57,205 shares (Direct, null); Stock Options — 29,994 shares (Direct, null); Common Stock — 51,160 shares (Indirect, By 401(k))
Footnotes (1)
  1. Includes shares of restricted stock which vest at a rate of 20% per year commencing on June 28, 2023. Includes shares of restricted stock which vest at a rate of 20% per year commencing on June 15, 2027. Stock options vest at a rate of 20% per year commencing on June 28, 2023. Stock options vest at a rate of 20% per year commencing on May 16, 2024. Stock options vest at a rate of 20% per year commencing on June 15, 2027.
Open-market purchase 970 shares at $15.00/share Common Stock bought on June 16, 2026
Direct holdings after transaction 57,205 shares Common Stock held directly by CEO after June 16, 2026
ESOP indirect holdings 4,429 shares Common Stock held indirectly by ESOP
401(k) indirect holdings 51,160 shares Common Stock held indirectly by 401(k)
IRA indirect holdings 604 shares Common Stock held indirectly by IRA
Options at $14.55 42,335 underlying shares at $14.55 Stock options expiring June 15, 2036
Options at $6.48 3,000 underlying shares at $6.48 Stock options expiring May 16, 2033
Options at $8.13 29,994 underlying shares at $8.13 Stock options expiring June 28, 2032
open-market purchase financial
"Purchase in open market or private transaction"
An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.
ESOP financial
"nature_of_ownership": "By ESOP""
An Employee Stock Ownership Plan (ESOP) is a program that gives employees ownership shares in their company, often as part of their benefits package. It acts like a company-sponsored savings plan, allowing workers to have a stake in the company's success, which can boost motivation and loyalty. For investors, ESOPs can influence company decisions and stock value, making them an important aspect of corporate ownership and governance.
IRA financial
"nature_of_ownership": "By IRA""
An individual retirement account (IRA) is a savings account designed to help people put aside money for their retirement, often with tax advantages that encourage long-term savings. It matters to investors because it can grow over time, providing financial security later in life, and offers benefits that can reduce current taxes or allow investments to compound more effectively.
401(k) financial
"nature_of_ownership": "By 401(k)""
A 401(k) is a type of retirement savings plan offered by employers that allows workers to set aside a portion of their paycheck before taxes are taken out. The money saved in a 401(k) can grow over time through investments, helping individuals build funds for their future retirement. It matters to investors because it provides a tax-advantaged way to save and invest for long-term financial security.
restricted stock financial
"Includes shares of restricted stock which vest at a rate of 20% per year"
Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.
Stock options financial
"Stock options vest at a rate of 20% per year"
Stock options are agreements that give a person the right to buy or sell a company's stock at a specific price within a certain time frame. They are often used as a reward or incentive, similar to a coupon that can be used later if the stock price rises, allowing the holder to make a profit.
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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Zillges Nicholas W
(Last)(First)(Middle)
500 SCOTT STREET
(Street)
WAUSAU WISCONSIN 54403
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
Marathon Bancorp, Inc. /MD/ [ MBBC ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
XOfficer (give title below)Other (specify below)
President and CEO
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/16/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock06/16/2026P970A$1557,205(1)(2)D
Common Stock51,160IBy 401(k)
Common Stock604IBy IRA
Common Stock4,429IBy ESOP
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Options$8.1306/28/202306/28/2032Common Stock29,994(3)29,994(3)D
Stock Options$6.4805/16/202405/16/2033Common Stock3,000(4)3,000(4)D
Stock Options$14.5506/15/202706/15/2036Common Stock42,335(5)42,335(5)D
Explanation of Responses:
1. Includes shares of restricted stock which vest at a rate of 20% per year commencing on June 28, 2023.
2. Includes shares of restricted stock which vest at a rate of 20% per year commencing on June 15, 2027.
3. Stock options vest at a rate of 20% per year commencing on June 28, 2023.
4. Stock options vest at a rate of 20% per year commencing on May 16, 2024.
5. Stock options vest at a rate of 20% per year commencing on June 15, 2027.
/s/ Benjamin Azoff, pursuant to power of attorney06/17/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did MBBC CEO Nicholas W. Zillges report?

Nicholas W. Zillges reported buying 970 Marathon Bancorp common shares at $15.00 each in an open-market transaction on June 16, 2026. This increased his directly held stake to 57,205 shares, according to the Form 4 filing.

How many Marathon Bancorp (MBBC) shares does the CEO hold after this trade?

After the June 16, 2026 trade, the CEO directly holds 57,205 shares of Marathon Bancorp common stock. He also reports indirect ownership of 4,429 ESOP shares, 604 IRA shares, and 51,160 shares through a 401(k) plan.

What stock options on MBBC does the CEO report in this Form 4?

The CEO reports stock options over 42,335 shares at $14.55 expiring June 15, 2036, 3,000 shares at $6.48 expiring May 16, 2033, and 29,994 shares at $8.13 expiring June 28, 2032, all on Marathon Bancorp common stock.

What indirect Marathon Bancorp holdings are reported for the MBBC CEO?

The filing lists indirect holdings of 4,429 shares of common stock held by an ESOP, 604 shares held by an IRA, and 51,160 shares held by a 401(k) plan. These positions supplement the CEO’s directly owned Marathon Bancorp shares.

How do the MBBC CEO’s stock options vest according to the Form 4 footnotes?

Footnotes state certain stock options vest at 20% per year, beginning June 28, 2023, May 16, 2024, or June 15, 2027, depending on the specific grant. This staggered vesting gradually makes more options exercisable over multiple years.