X0206 3 2017-06-29 0 0001702750 BYLINE BANCORP, INC. BY 0001482596 Paracchini Alberto J C/O BYLINE BANCORP, INC. 180 NORTH LASALLE STREET SUITE 300 CHICAGO IL 60601 1 1 0 0 President and CEO Common Stock 15814 D Stock Option (Right to Buy) 11.18 2025-06-26 Common Stock 214494 D Stock Option (Right to Buy) 11.18 2025-06-26 Common Stock 71494 D 80% of these options have already vested and the remaining 20% vest on June 28, 2018, subject to continued service with the issuer. Options were all previously earned based on the achievement of performance goals and 80% of the earned options previously vested. The remaining 20% vest on June 28, 2018, subject to continued service with the issuer. Exhibit 24 - Power of Attorney /s/ Lindsay Corby, Attorney-in-Fact for Alberto J. Paracchini 2017-06-29