Results of Operations and Financial Condition. On July 23, 2026, Byline Bancorp, Inc., (“Byline" or the "Company”) issued a press release announcing its financial results for the second quarter ended June 30, 2026. A copy of the press release is attached as Exhibit 99.1 and is incorporated herein by reference. On July 23, 2026, the Company made available on its website a slide presentation regarding the Company’s second quarter 2026 financial results, which will be used as part of a publicly…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The disclosure set forth in

Entry into a Material Definitive Agreement. 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…

Results of Operations and Financial Condition. On April 23, 2026, Byline Bancorp, Inc., (“Byline" or the "Company”) issued a press release announcing its financial results for the first quarter ended March 31, 2026. A copy of the press release is attached as Exhibit 99.1 and is incorporated herein by reference. On April 23, 2026, the Company made available on its website a slide presentation regarding the Company’s first quarter 2026 financial results, which will be used as part of a publicly…

Results of Operations and Financial Condition. On January 22, 2026, Byline Bancorp, Inc., (“Byline" or the "Company”) issued a press release announcing its financial results for the fourth quarter ended December 31, 2025. A copy of the press release is attached as Exhibit 99.1 and is incorporated herein by reference. On January 22, 2026, the Company made available on its website a slide presentation regarding the Company’s fourth quarter 2025 financial results, which will be used as part of a…

Other Events. On December 11, 2025, Byline Bancorp, Inc. (the “Company”) announced that its Board of Directors approved a new stock repurchase program authorizing the purchase of up to an aggregate of 2,250,000 shares of the Company’s outstanding common stock over a year period ending December 31, 2026. Under the new program, shares may, at the discretion of management, be repurchased from time to time in open market purchases as market conditions warrant or in privately negotiated transactio…

Results of Operations and Financial Condition. On October 23, 2025, Byline Bancorp, Inc., (“Byline" or the "Company”) issued a press release announcing its financial results for the third quarter ended September 30, 2025. A copy of the press release is attached as Exhibit 99.1 and is incorporated herein by reference. On October 23, 2025, the Company made available on its website a slide presentation regarding the Company’s third quarter 2025 financial results, which will be used as part of a…

Entry into a Material Definitive Agreement. On August 7, 2025, Byline Bancorp, Inc. (the “Company”) entered into a Subordinated Note Purchase Agreement (the “Purchase Agreement”) with certain institutional accredited investors and qualified institutional buyers (the “Purchasers”) pursuant to which the Company sold and issued $75.0 million in aggregate principal amount of its 6.875% Fixed-to-Floating Rate Subordinated Notes due 2035 (the “Notes”). The Notes were issued by the Company to the Pu…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth under

Results of Operations and Financial Condition. On July 24, 2025, Byline Bancorp, Inc., (“Byline" or the "Company”) issued a press release announcing its financial results for the second quarter ended June 30, 2025. A copy of the press release is attached as Exhibit 99.1 and is incorporated herein by reference. On July 24, 2025, the Company made available on its website a slide presentation regarding the Company’s second quarter 2025 financial results, which will be used as part of a publicly…

Changes in Registrant's Certifying Accountant. On June 16, 2025, Byline Bancorp, Inc. (the "Company") was notified that Moss Adams LLP ("Moss Adams"), the Company's independent registered public accounting firm, merged with Baker Tilly US, LLP effective on June 3, 2025. The combined audit practices operate as Baker Tilly US, LLP ("Baker Tilly"). In connection with the notification of the merger, Moss Adams has resigned as the auditors of the Company and the Audit Committee of the Company's Bo…

Other Events. On June 12, 2025, the Estate of Daniel L. Goodwin (the “ Estate ”) and Equity Shares Investors, LLC, an affiliate of the Estate (the “ Selling Stockholders ”), completed their sale of 4,282,210 shares (the “ Shares ”) of common stock of Byline Bancorp, Inc. (the “ Company ”) in a registered public offering (the “ Offering ”) pursuant to the Company’s Registration Statement on Form S-3 filed under the Securities Act of 1933, as amended, that became automatically effective upon fi…

Entry into a Material Definitive Agreement. 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…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The disclosure set forth in

Results of Operations and Financial Condition. On April 24, 2025, Byline Bancorp, Inc., (“Byline" or the "Company”) issued a press release announcing its financial results for the first quarter ended March 31, 2025. A copy of the press release is attached as Exhibit 99.1 and is incorporated herein by reference. On April 24, 2025, the Company made available on its website a slide presentation regarding the Company’s first quarter 2025 financial results, which will be used as part of a publicly…

Results of Operations and Financial Condition. On January 23, 2025, Byline Bancorp, Inc., (“Byline" or the "Company”) issued a press release announcing its financial results for the fourth quarter ended December 31, 2024. A copy of the press release is attached as Exhibit 99.1 and is incorporated herein by reference. On January 23, 2025, the Company made available on its website a slide presentation regarding the Company’s fourth quarter 2024 financial results, which will be used as part of a…

Other Events. On December 5, 2024, Byline Bancorp, Inc. (the “Company”) announced that its Board of Directors approved a new stock repurchase program authorizing the purchase of up to an aggregate of 1,250,000 shares of the Company’s outstanding common stock over a year period ending December 31, 2025. Under the new program, shares may, at the discretion of management, be repurchased from time to time in open market purchases as market conditions warrant or in privately negotiated transaction…

Results of Operations and Financial Condition. On October 24, 2024, Byline Bancorp, Inc., (“Byline" or the "Company”) issued a press release announcing its financial results for the third quarter ended September 30, 2024. A copy of the press release is attached as Exhibit 99.1 and is incorporated herein by reference. On October 24, 2024, the Company made available on its website a slide presentation regarding the Company’s third quarter 2024 financial results, which will be used as part of a…

Regulation FD Disclosure. On September 30, 2024, Byline Bancorp, Inc., a Delaware corporation (" Byline "), issued a press release announcing the execution of an Agreement and Plan of Merger in connection with its proposed acquisition of First Security Bancorp, Inc., a Delaware corporation (" First Security Bancorp "), and First Security Bancorp's wholly owned bank subsidiary, First Security Trust and Savings Bank, an Illinois chartered bank. Byline has also provided supplemental information…

Results of Operations and Financial Condition. On July 25, 2024, Byline Bancorp, Inc., (“Byline" or the "Company”) issued a press release announcing its financial results for the second quarter ended June 30, 2024. A copy of the press release is attached as Exhibit 99.1 and is incorporated herein by reference. On July 25, 2024, the Company made available on its website a slide presentation regarding the Company’s second quarter 2024 financial results, which will be used as part of a publicly…

Entry into a Material Definitive Agreement. 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”). On May 24, 2024, the Company entered into the First Amendment to the Second Amended and Restated Term Loan and Revolving Credit Agreement (the “Amendment") with the Lender, which is effective May 26, 2024, and provides for (1) the renewal of the revolving…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The disclosure set forth in

Results of Operations and Financial Condition. On April 25, 2024, Byline Bancorp, Inc., (“Byline" or the "Company”) issued a press release announcing its financial results for the first quarter ended March 31, 2024. A copy of the press release is attached as Exhibit 99.1 and is incorporated herein by reference. On April 25, 2024, the Company made available on its website a slide presentation regarding the Company’s first quarter 2024 financial results, which will be used as part of a publicly…

Director — Carlos Ruiz Sacristán: Appointment of Carlos Ruiz Sacristán to the Risk Committee.

Results of Operations and Financial Condition. On January 25, 2024, Byline Bancorp, Inc., (“Byline" or the "Company”) issued a press release announcing its financial results for the fourth quarter ended December 31, 2023. A copy of the press release is attached as Exhibit 99.1 and is incorporated herein by reference. On January 25, 2024, the Company made available on its website a slide presentation regarding the Company’s fourth quarter 2023 financial results, which will be used as part of a…