X0206 3 2017-06-29 0 0001702750 BYLINE BANCORP, INC. BY 0001709905 BEUBE L. GENE C/O BYLINE BANCORP, INC. 180 NORTH LASALLE STREET SUITE 300 CHICAGO IL 60601 1 0 0 0 Common Stock 2781 D Exhibit 24 - Power of Attorney /s/ Lindsay Corby, Attorney-in-Fact for L. Gene Beube 2017-06-29