X0306 4 2020-03-19 0000719220 S&T BANCORP INC STBA 0001658977 Lazzari Melanie A 800 PHILADELPHIA STREET INDIANA PA 15701 1 Executive Vice President Common Stock 2020-03-19 4 F 0 105 27.16 D 7160.8837 D Common Stock 2020-03-20 4 A 0 80 25.88 A 7240.8837 D Common Stock 2020-03-20 4 F 0 387 25.88 D 6853.8837 D Common Stock 5070.5674 I 401(k) Common Stock 9 I Spouse IRA Shares withheld upon vesting of Restricted Stock for payment of tax liability. Based on performance goals of the 2017 long term incentive plan, the registrant exceeded the target level resulting in an additional award of performance shares. /s/Timothy P. McKee, attorney-in-fact for Melanie A. Lazzari 2020-03-23