$BY

BYLINE BANCORP, INC. (BY) filed an SEC Form 8-K — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers. Exhibit 99.1 Byline Bancorp, Inc. Names Sean H. McGuire Chief Commercial Banking Officer and Scott E. Hawthorne Chief Credit Officer as Part of Ongoing Succession Planning Brogan Ptacin, EVP– Head of Commercial Banking, and Mark Fucinato, EVP – Chief Credit Officer, to Retire Aft

Byline Bancorp (BY) announced leadership changes, naming Sean H. McGuire as EVP & Chief Commercial Banking Officer and Scott E. Hawthorne as EVP & Chief Credit Officer, effective January 1, 2027, following planned retirements at the end of 2026.

BYLINE BANCORP, INC. (BY) filed an SEC Form 8-K — Regulation FD Disclosure. Exhibit 99.1 Byline Bancorp, Inc. and ILLINOIS STATE Bancorp, Inc. Announce Definitive Merger Agreement Chicago, IL, October 6, 2026 – Byline Bancorp, Inc. (“Byline”) (NYSE: BY), and Illinois State Bancorp, Inc. ("Illinois State Bancorp"), today jointly announced that they have e

Byline Bancorp (BY) agreed to acquire Illinois State Bancorp in a cash-and-stock deal valued at ~$87.9M. The deal includes 1.4M shares, $28.9M cash, and $5.1M for option settlement, expected to close in Q1 2027, pending approvals.

HERENCIA ROBERTO R (CHIEF EXECUTIVE OFFICER) sold 19,750 shares of BYLINE BANCORP, INC. (BY) at $39.21 ($0.77M total) on 2026-08-13.

MBG INVESTORS I, L.P. sold 300,000 shares of BYLINE BANCORP, INC. (BY) at $39.10 ($11.73M total) on 2026-08-07.

DEL VALLE PEROCHENA ANTONIO sold 300,000 indirectly-held shares of BYLINE BANCORP, INC. (BY) at $39.10 ($11.73M total) on 2026-08-07.

Ptacin Brogan (HEAD OF COMMERCIAL BANKING) sold (to issuer) 9,450 shares of BYLINE BANCORP, INC. (BY) at $39.61 ($0.37M total) on 2026-08-03.

Byline Bancorp (NYSE:BY) reported Q2 CY2026 results. Revenue rose 6.6% year on year to $117.7 million, exceeding Wall Street estimates by 1.8%. Non-GAAP profit was $0.91 per share, 15.4% above consensus. The board increased its dividend by 16.7%, and the stock was about $37.63 after results.

BYLINE BANCORP, INC. (BY) filed an SEC Form 8-K — Results of Operations and Financial Condition. EX-99.1 2 by-ex99_1.htm EX-99.1 EX-99.1 Exhibit 99.1 Byline Bancorp, Inc. Reports Second Quarter 2026 Financial Results Second quarter net income of $40.2 million, $0.90 diluted earnings per share Chicago, IL, July 23, 2026 – Byline Bancorp, Inc. (NYSE: BY), today reported: At or