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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): August 26, 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 |  | 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 |  | 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 7.01 | Regulation FD Disclosure.

First Busey Corporation (“Busey”) plans to use the presentation filed herewith, in whole or in part, in one or more meetings with investors and analysts. Presentation materials are furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference. The presentation materials will also be available on Busey's website at ir.busey.com.

The information in Item 7.01 of this Current Report on Form 8-K and Exhibit 99.1 attached hereto is being “furnished” and will not, except to the extent required by applicable law or regulation, be deemed “filed” by Busey for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that section, nor will any of such information or exhibits be deemed incorporated by reference into any filing under the Securities Act or the Exchange Act.

| Item 9.01. | Financial Statements and Exhibits.

Exhibit Number |  | Description of Exhibit
99.1 |  | Investor Highlights Presentation by First Busey Corporation, dated August 26, 202 5
104 |  | Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101)

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: | August 26, 2025 |  | By: | /s/ SCOTT A. PHILLIPS |
|  |  |  | Scott A. Phillips |
|  |  |  | Interim Chief Financial Officer, Executive Vice President and Chief Accounting Officer