STOCK TITAN

Marathon Bancorp (MBBC) director Grimm exercises options, updates share and trust holdings

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

Rhea-AI Filing Summary

Marathon Bancorp director Thomas L. Grimm reported option-related activity and updated holdings. He exercised stock options covering 300 shares of Common Stock at $6.48 per share, with the acquired shares held indirectly by a trust, bringing that trust’s stake to 22,294 shares.

Grimm now also holds 2,998 Common shares directly, which include restricted stock that vests 20% per year beginning June 28, 2023. On the derivative side, he retains 600 stock options at a $6.48 exercise price expiring May 16, 2033, and a separate option position covering 2,400 shares at an $8.13 exercise price expiring June 28, 2032, both vesting in 20% annual installments.

Positive

  • None.

Negative

  • None.
Insider Grimm Thomas L
Role null
Type Security Shares Price Value
Exercise Stock Options 300 $0.00 --
Exercise Common Stock 300 $6.48 $2K
holding Stock Options -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Stock Options — 600 shares (Direct, null); Common Stock — 22,294 shares (Indirect, By Trust); Common Stock — 2,998 shares (Direct, null)
Footnotes (1)
  1. Includes shares of restricted stock which 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 28, 2023.
Options exercised 300 shares Common Stock acquired via option exercise at $6.48
Exercise price $6.48 per share Price for 300 exercised stock options
Indirect holdings by trust 22,294 shares Common Stock held indirectly by trust after transactions
Direct common holdings 2,998 shares Common Stock held directly, including restricted stock
Remaining options at $6.48 600 options Stock options expiring May 16, 2033
Remaining options at $8.13 2,400 underlying shares Stock options expiring June 28, 2032
Vesting rate 20% per year Restricted stock and stock option vesting schedules
Stock Options financial
"Stock options vest at a rate of 20% per year commencing on May 16, 2024."
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.
restricted stock financial
"Includes shares of restricted stock which vest at a rate of 20% per year commencing on June 28, 2023."
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.
exercise price financial
"conversion_or_exercise_price: "8.1300" for stock options expiring June 28, 2032."
The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.
By Trust financial
"nature_of_ownership: "By Trust" for indirectly held Common Stock after the transaction."
derivative security financial
"transaction_code_description: "Exercise or conversion of derivative security" for the option exercise."
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
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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*
Grimm Thomas L

(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
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/03/2026
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 Stock06/03/2026M300A$6.4822,294IBy Trust
Common Stock2,998(1)D
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$6.4806/03/2026M30005/16/202405/16/2033Common Stock300(2)$0600(2)D
Stock Options$8.1306/28/202306/28/2032Common Stock2,400(3)2,400(3)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. Stock options vest at a rate of 20% per year commencing on May 16, 2024.
3. Stock options vest at a rate of 20% per year commencing on June 28, 2023.
/s/ Benjamin Azoff, pursuant to power of attorney06/05/2026
** 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)

FAQ

What did MBBC director Thomas L. Grimm do in this Form 4 filing?

Thomas L. Grimm exercised stock options for 300 shares of Marathon Bancorp Common Stock at $6.48 per share. The resulting shares are held indirectly by a trust, and the filing also updates his direct and derivative holdings.

How many Marathon Bancorp (MBBC) shares does the trust associated with Thomas Grimm hold after the transaction?

After the reported option exercise, the trust associated with Thomas Grimm holds 22,294 shares of Marathon Bancorp Common Stock. These shares are reported as indirect ownership, with the nature of ownership described as "By Trust" in the filing.

How many Marathon Bancorp (MBBC) shares does Thomas Grimm hold directly after this filing?

Thomas Grimm holds 2,998 shares of Marathon Bancorp Common Stock directly following the reported activity. This direct position includes restricted stock that vests at a rate of 20% per year starting on June 28, 2023, according to the footnotes.

What stock option positions does Thomas Grimm retain in Marathon Bancorp (MBBC)?

Grimm retains 600 stock options with a $6.48 exercise price expiring May 16, 2033 and a separate option position covering 2,400 underlying shares at an $8.13 exercise price expiring June 28, 2032. Both option grants vest 20% per year from their respective start dates.

At what price did Thomas Grimm exercise Marathon Bancorp (MBBC) stock options in this Form 4?

He exercised options covering 300 shares of Marathon Bancorp Common Stock at $6.48 per share. This transaction is coded as an option exercise (code M) and is classified as acquiring shares through exercise or conversion of a derivative security.

How do Thomas Grimm’s restricted stock and stock options in MBBC vest over time?

His restricted stock included in the 2,998 directly held shares vests 20% per year beginning June 28, 2023. His stock options vest 20% per year beginning May 16, 2024 and June 28, 2023, as noted in the filing footnotes.