X0609 4 2026-05-16 0001835385 Marathon Bancorp, Inc. /MD/ MBBC 0001855946 Spatz Nora false 500 SCOTT STREET WAUSAU WI 54403 1 EVP and CAO 0 Common Stock 2026-05-16 4 F 0 30 14.50 D 19949 D Common Stock 35701 I By 401(k) Common Stock 1598 I By Trust Common Stock 1149 I As custodian Common Stock 1209 I By ESOP Common Stock 1372 I By Spouse Stock Options 8.1300 2023-06-28 2032-06-28 Common Stock 3600 3600 D Stock Options 6.4800 2024-05-16 2033-05-16 Common Stock 2883 2883 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 2026-05-19