144 0001341537 XXXXXXXX LIVE 0000100378 TWIN DISC INC 001-07635 222 East Erie Street Suite 400 Milwaukee WI 53202 262-638-4000 Knutson Jeffrey Scott (TWIN) Officer Common E*Trade from Morgan Stanley

PO Box 484 Jersey City NJ 07303-0484

10275 134499.75 14147661 09/05/2025 NASDAQ Common 07/01/2015 Restricted Stock Award Issuer N 4583 07/01/2015 Compensation Common 08/01/2018 Performance Stock Award Vesting Issuer N 893 08/01/2018 Compensation Common 08/13/2020 Performance Stock Award Vesting Issuer N 2913 08/13/2020 Compensation Common 08/01/2021 Restricted Stock Unit Award Vesting Issuer N 1886 08/01/2021 Compensation Y (In regards to 3(d))Aggregate Market Value of shares calculated based on a closing price of $13.09 on September 4, 2025. 09/04/2025 /s/ Jeffrey S. Knutson