X0508 4 2025-05-16 0001835385 Marathon Bancorp, Inc. /MD/ MBBC 0001855802 Selting-Buchberger Joy 500 SCOTT STREET WAUSAU WI 54403 1 SVP and CFO 0 Common Stock 2025-05-16 4 F 0 44 10.03 D 5855 D Common Stock 21788 I By 401(k) Common Stock 1264 I By ESOP 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 4804 4804 D 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 May 16, 2024. 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 2025-05-20