Results of Operations · Reg FD Disclosure

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) January 21, 2025     SIMMONS FIRST NATIONAL CORPORATION (Exact name of registrant as specified in its charter)       Arkansas   0-6253   71-0407808 (State or other jurisdiction of incorporation)   (Commission File Number)   (I.R.S. Employer Identification No.)   501 Main Street , Pine Bluff , Arkansas   71601 (Address of principal executive offices)   (Zip Code) (870) 541-1000 (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):   ☐ 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, par value $0.01 per share   SFNC   The Nasdaq Global Select Market Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2). 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. ☐       Item 2.02 Results of Operations and Financial Condition. On January 21, 2025, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information provided pursuant to this Item 2.02, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 (“Exchange Act”) or otherwise subject to the liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Registrant under the Securities Act of 1933 (“Securities Act”) or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.   Item 7.01 Regulation FD Disclosure. On January 21, 2025, the Registrant issued an investor presentation, a copy of which is attached hereto as Exhibit 99.2 and is incorporated herein by reference. The information provided pursuant to this Item 7.01, including Exhibit 99.2, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Exchange Act or otherwise subject to the liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Registrant under the Securities Act or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.   Item 9.01 Financial Statements and Exhibits.   Exhibit 99.1    Press Release dated January 21, 2025 Exhibit 99.2    Investor Presentation issued on January 21, 2025 Exhibit 104    Cover Page Interactive Data File (embedded within the Inline XBRL Document) 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 hereunto duly authorized.       SIMMONS FIRST NATIONAL CORPORATION       /s/ C. Daniel Hobbs Date: January 21, 2025       C. Daniel Hobbs, Executive Vice President and       Chief Financial Officer