Exhibit 99.1 Chicago, IL, July 23, 2026 – Byline Bancorp, Inc. (NYSE: BY), today reported: | | | | At or for the quarter | | Second Quarter Highlights | | --- | --- | --- | --- | --- | --- | | | | 2Q26 | 1Q26 | 2Q25 | (compared to 1Q26 unless specified) | | Financial Results ($$ in thousands) | | | | | • Delivered strong quarterly results, reflecting | | Net interest income (NII) | $$ | 100,836 $$ | 99,863 $$ | 95,982 | record revenues and solid growth | | Non-interest income | | 16,876 | 12,538 | 14,471 | | | ...