X0206 3 2017-06-29 0 0001702750 BYLINE BANCORP, INC. BY 0001709909 RULL STEVEN M. C/O BYLINE BANCORP, INC. 180 NORTH LASALLE STREET SUITE 300 CHICAGO IL 60601 1 0 0 0 Common Stock 190400 I By Rull Family Partnership, L.P. Shares of common stock are held through the Rull Family Partnership, L.P. Mr. Rull possesses the voting and investment power with respect to the shares of common stock held by the Rull Family Partnership, L.P. Exhibit 24 - Power of Attorney /s/ Lindsay Corby, Attorney-in-Fact for Steven M. Rull 2017-06-29