Byline Bancorp Inc — Current Report (Form 8-K)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): May 22, 2026

BYLINE BANCORP, INC.

(Exact Name of Registrant as Specified in Its Charter)

Delaware

(State or Other Jurisdiction

of Incorporation)

(773) 244-7000

(Registrant’s Telephone Number, Including Area Code)

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

As previously disclosed, on May 26, 2023, Byline Bancorp, Inc. (the “Company”) entered into a Second Amended and Restated Term Loan and Revolving Credit Agreement with CIBC Bank USA (the “Lender”). As also previously disclosed, on May 24, 2024, the Company entered into the First Amendment to the Second Amended and Restated Term Loan and Revolving Credit Agreement (the “First Amendment") with the Lender, which was effective May 26, 2024, and provided for (1) the renewal of the revolving line-of- credit facility of up to $15,000,000, and (2) extending its maturity date to May 25, 2025. As further previously disclosed, on May 21, 2025, the Company entered into the Second Amendment to the Second Amended and Restated Term Loan and Revolving Credit Agreement (the “Second Amendment”) with the Lender, which was effective May 25, 2025, and provided for (1) the renewal of the revolving line-of-credit of up to $15,000,000, and (2) extending its maturity date to May 24, 2026.

On May 22, 2026, the Company entered into the Third Amendment to the Second Amended and Restated Term Loan and Revolving Credit Agreement (the “Third Amendment”) with the Lender, which was effective May 24, 2026, and provides for (1) the renewal of the revolving line of credit facility of up to $15,000,000, and (2) extending its maturity date to May 23, 2027.

The foregoing description of the Third Amendment is only a brief summary and is qualified in its entirety by the complete terms of the Third Amendment, a copy of which is filed as Exhibit 10.1 to this current report on Form 8-K and incorporated by reference herein.

The disclosure set forth in Item 1.01 above is incorporated herein by reference.

(d) Exhibits.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.