X0206 3 2017-06-29 0 0001702750 BYLINE BANCORP, INC. BY 0001169102 LAMMERS BRUCE W C/O BYLINE BANCORP, INC. 180 NORTH LASALLE STREET SUITE 300 CHICAGO IL 60601 0 1 0 0 EVP and Pres. of SBC Common Stock 49163 I By Bruce W. Lammers Revocable TR UA Shares of common stock are held through the Bruce W Lammers Revocable TR UA Jan. 17, 2014. Mr. Lammers possesses the voting and investment power with respect to the shares of common stock held by the Bruce W. Lammers TR UA Jan. 17, 2014. Exhibit 24 - Power of Attorney /s/ Lindsay Corby, Attorney-in-Fact for Bruce W. Lammers 2017-06-29