X0306 4/A 2021-10-25 2021-12-27 0000719220 S&T BANCORP INC STBA 0001813551 Dornetto Mary A 800 PHILADELPHIA STREET INDIANA PA 15701 1 Executive Vice President Common Stock 2021-10-25 4 F 0 848 31.56 D 6131 D Accelerated vesting of time-based restricted shares upon retirement or retirement eligibility. Shares withheld for taxes. Filing amended to correct shares withheld upon vesting of Restricted Stock for payment of tax liability. /s/ Timothy P. McKee, attorney-in-fact for Mary A. Dornetto 2021-12-28