Byline Bancorp, Inc.: leadership changes announced

What happened
On Oct 08, 2026, Byline Bancorp, Inc. and its wholly-owned subsidiary Byline Bank announced that two senior officers will retire effective Dec 31, 2026, and that successors will be appointed effective Jan 01, 2027. The filing states that Brogan M. Ptacin, Executive Vice President and Head of Commercial Banking and a named executive officer, provided notice of his decision to retire, and that Mark Fucinato, Executive Vice President and Chief Credit Officer, provided notice of his decision to retire. The filing also states the Bank appointed Sean H. McGuire and Scott Hawthorne to new officer roles effective Jan 01, 2027.

Key details

• Brogan M. Ptacin will retire effective Dec 31, 2026; after retirement he will be employed by the Bank in a non-executive, part-time, advisory capacity for a period to be determined.
• Sean H. McGuire, age 58, was appointed to the newly created position of Chief Commercial Banking Officer, effective Jan 01, 2027. Mr. McGuire joined the Bank in Jul 2019 and previously served as Commercial Group President at MB Financial Bank (Aug 2009 to Jul 2019) and as a Senior Vice President at Fifth Third Bank. Education: Bachelor’s in Economics, University of Notre Dame; MBA, Quinlan School of Business, Loyola University Chicago.
• Mark Fucinato will retire effective Dec 31, 2026; after retirement he will be employed by the Bank in a non-executive, part-time, advisory capacity for a period to be determined.
• Scott Hawthorne, age 46, was appointed to succeed Mr. Fucinato as Chief Credit Officer, effective Jan 01, 2027. Mr. Hawthorne joined the Bank in Jun 2023 and currently serves as Deputy Chief Credit Officer; he held senior credit roles at Fifth Third Bank (May 2019 to Jun 2023) and MB Financial Bank (May 2005 to May 2019).
• The filing states there are no family relationships or arrangements between Messrs. McGuire or Hawthorne and any director or executive officer, and that neither has a direct or indirect material interest in any transaction required to be reported under Item 404(a) of Regulation S-K. A press release announcing these changes is attached as Exhibit 99.1.

Why it may matter
The filing reports Item 5.02 (departure and election of officers) and Item 7.01 (Regulation FD disclosure) concerning officer retirements and appointments. This filing does not explain why the insider traded or why the company acted.