X0508 4 2025-04-21 0001835385 Marathon Bancorp, Inc. /MD/ MBBC 0001856506 Wimmer Timothy R 500 SCOTT STREET WAUSAU WI 54403 1 0 Common Stock 2025-04-21 4 A 0 2500 10 A 9364 I By Trust Common Stock 2998 D Stock Options 8.1294 2023-06-28 2032-06-28 Common Stock 5999 5999 D Stock Options 6.4831 2024-05-16 2033-05-16 Common Stock 1499 1499 D Reflects a 1.3728 stock exchange in connection with the Company's mutual to stock conversion. Includes shares of restricted stock which vest at a rate of 20% per year commencing on June 28, 2023. Exercise price has been adjusted for the 1.3728 to 1.00 exchange in connection with the Company's mutual to stock conversion. 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. /s/ Benjamin Azoff, pursuant to power of attorney 2025-04-22