X0306 5 2015-12-31 0 0 0000719220 S&T BANCORP INC STBA 0001348485 Polley Malcolm Emerson 800 PHILADELPHIA ST INDIANA PA 15701 1 EXECUTIVE VICE PRESIDENT Common Stock 2015-12-31 5 J 0 211.28 30.82 A 3981.194 I 401 K Common Stock 5489 D Common Stock 99 I Wife These shares represent the YTD increase in shares held in a 401K plan. /s/ Timothy P. McKee P.O.A. for Malcolm E. Polley 2016-02-10