Company Update

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): December 04, 2025 __________________________________________ First Busey Corporation (Exact name of Registrant as specified in its charter) __________________________________________ Nevada 0-15950 37-1078406 (State of Incorporation) (Commission File Number) (I.R.S. Employer Identification No.) 11440 Tomahawk Creek Parkway Leawood , Kansas 66211 (Address of Principal Executive Offices) (217) 365-4544 (Registrant’s telephone number, including area code) N/A (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: ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock, $0.001 par value BUSE The Nasdaq Stock Market LLC Depositary Shares, each representing a 1/40th interest in a share of 8.25% Fixed-Rate Series B Non-Cumulative Perpetual Preferred Stock , $0.001 par value BUSEP The Nasdaq Stock Market LLC 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). ☐ 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. ☐ Item 8.01.    Other Events Amendment to Share Repurchase Program On December 4, 2025, the First Busey Corporation (“Busey”) board of directors approved an amendment to Busey’s previously adopted share repurchase program to increase the number of shares of Busey’s common stock available for repurchase by 4,000,000 shares. As of the close of business on December 4, 2025, under the amended share repurchase program, Busey is now authorized to repurchase, from time to time as Busey deems appropriate, up to a remaining number of 5,454,275 shares of Busey's common stock. Repurchases may be made in the open market, through block trades or otherwise, and in privately negotiated transactions. The repurchase program does not obligate Busey to repurchase any dollar amount or number of shares. The repurchase program has no expiration date, and may be expanded, modified, suspended, or discontinued by Busey's board of directors at its discretion at any time. Signature Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. FIRST BUSEY CORPORATION Date: December 5, 2025 By: /s/ CHRISTOPHER H.M. CHAN Christopher H.M. Chan Chief Financial Officer