Marathon Bancorp, Inc. (MBBC) director exercises 4,498 options into trust holdings

Rhea-AI Filing Summary

Marathon Bancorp, Inc. director Timothy R. Wimmer exercised stock options for 4,498 shares of common stock on June 3, 2026, at exercise prices of $8.13 and $6.48 per share, with shares held indirectly by a trust. After these transactions, he holds 3,000 stock options directly, 13,862 common shares indirectly by trust, and 2,998 common shares directly.

Insider Trade Summary

Net Buyer: 4,498 shares

Net Buy 5 txns

Insider Wimmer Timothy R

Role Director

Type	Security	Shares	Price	Value
Exercise	Stock Options	3,599	$0.00	$0.00
Exercise	Stock Options	899	$0.00	$0.00
Exercise	Common Stock	3,599	$8.13	$29K
Exercise	Common Stock	899	$6.48	$6K
holding	Common Stock	--	--	--

Holdings After Transaction: Stock Options — 3,000 shares (Direct); Common Stock — 13,862 shares (Indirect, By Trust); Common Stock — 2,998 shares (Direct)

Footnotes (3)

1. F1. Includes shares of restricted stock which vest at a rate of 20% per year commencing on June 28, 2023.
2. F2. Stock options vest at a rate of 20% per year commencing on June 28, 2023.
3. F3. Stock options vest at a rate of 20% per year commencing on May 16, 2024.

Key Figures

Options Exercised: 4,498 shares Exercise Price 1: $8.13 per share Exercise Price 2: $6.48 per share +4 more

7 metrics

Options Exercised 4,498 shares Total stock options exercised into common stock on June 3, 2026

Exercise Price 1 $8.13 per share Conversion price for 3,599 options into common stock

Exercise Price 2 $6.48 per share Conversion price for 899 options into common stock

Stock Options Held 3,000 Direct post-transaction holding of stock options by Wimmer

Indirect Common Shares 13,862 Common stock held indirectly by trust after transactions

Direct Common Shares 2,998 Direct holding of Marathon Bancorp common stock as of June 3, 2026

Option Vesting Rate 20% per year Footnotes describe options vesting annually from 2023 and 2024 start dates

Key Terms

Stock Options, derivative security, restricted stock, By Trust, +1 more

5 terms

Stock Options financial

"security_title: Stock Options, transaction_type: derivative"

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.

derivative security financial

"transaction_code_description: Exercise or conversion of derivative security"

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.

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.

By Trust financial

"nature_of_ownership: By Trust for indirect common stock holdings"

Rule 10b5-1 regulatory

"aff_10b5_one checkbox indicates Rule 10b5-1 plan status"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/05/2026 - 12:45 PM Accepted by SEC EDGAR 06/05/2026 - 12:45 PM Learn about SEC filing dates

FAQ

What transactions did MBBC director Timothy R. Wimmer report in this Form 4?

Timothy R. Wimmer reported exercising stock options into 4,498 shares of Marathon Bancorp common stock on June 3, 2026, at exercise prices of $8.13 and $6.48. The resulting shares are held indirectly through a trust.

How many Marathon Bancorp (MBBC) shares does Timothy R. Wimmer hold after these transactions?

Following the reported transactions, Wimmer holds 13,862 Marathon Bancorp common shares indirectly via a trust and 2,998 common shares directly. He also retains 3,000 stock options as a direct holding.

What was the total number of MBBC stock options exercised in this Form 4?

Wimmer exercised a total of 4,498 stock options, converting them into the same number of Marathon Bancorp common shares. The options had exercise prices of $8.13 and $6.48 per share.

Were Timothy R. Wimmer’s MBBC transactions made under a Rule 10b5-1 plan?

The Form 4 indicates the Rule 10b5-1 checkbox is not affirmed, meaning these transactions were not reported as being executed under a Rule 10b5-1 trading plan.

How do the MBBC stock options reported by Timothy R. Wimmer vest over time?

Footnotes state that certain MBBC stock options vest at a rate of 20% per year, commencing on June 28, 2023 and May 16, 2024, respectively, providing a gradual vesting schedule.

SEC Form 4

FORM 4

UNITED 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^*

Wimmer Timothy R

(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)

X	Director		10% 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)

X	Form 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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	06/03/2026		M		3,599	A	$8.13	12,963	I	By Trust
Common Stock	06/03/2026		M		899	A	$6.48	13,862	I	By Trust
Common Stock								2,998(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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Options	$8.13	06/03/2026		M			3,599	06/28/2023	06/28/2032	Common Stock	3,599(2)	$0	2,400(2)	D
Stock Options	$6.48	06/03/2026		M			899	05/16/2024	05/16/2033	Common Stock	899(3)	$0	600(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 June 28, 2023.

3. Stock options vest at a rate of 20% per year commencing on May 16, 2024.

	/s/ Benjamin Azoff, pursuant to power of attorney	06/05/2026
	** Signature of Reporting Person	Date
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)