Material Event (Form 8-K)

Item 8.01 Other Events.

Redemption of Subordinated Notes

On October 1, 2025 (the "Redemption Date"), Byline Bancorp, Inc. ("Byline") redeemed the entire $75,000,000 outstanding principal amount of Byline's 6.000% Fixed-to-Floating Rate Subordinated Notes due 2030 (the "Notes"). The Notes were redeemed pursuant to the terms of that certain Subordinated Debt Indenture, dated as of June 26, 2020, and supplemented by that certain First Supplemental Indenture, dated as of June 26, 2020, by and between Byline and U.S. Bank Trust Company, National Association, as successor in interest to U.S. Bank National Association, as trustee (the "Trustee"), at a redemption price equal to 100% of the aggregate principal amount of the Notes, plus accrued and unpaid interest thereon to, but excluding, the Redemption Date (the "Redemption Price"). As provided in the notice of full redemption, dated August 22, 2025, previously provided to the holders of the Notes, each such holder is entitled to receive the Redemption Price upon surrender of the Notes to the Trustee, who is acting as Byline's paying agent in connection with the redemption.