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) July 21, 2025 SIMMONS FIRST NATIONAL CORP ORATION (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 7.01 Regulation FD Disclosure. On July 21, 2025, Simmons First National Corporation (the “ Company ”) priced an underwritten public offering of 16,220,000 shares (the “ Offering ”) of the Company’s Class A common stock, par value $0.01 per share (the “ Common Stock ”). In conjunction with the Offering, the Company granted to the underwriters a 30-day option to purchase up to 2,433,000 of additional shares of Common Stock. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein solely for informational purposes. The information in this Current Report on Form 8-K, including in Exhibit 99.1, is being furnished pursuant to Item 7.01 of Form 8-K and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “ Exchange Act ”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any other filing under the Securities Act of 1933, as amended, or the Exchange Act. Cautionary Statement Regarding Forward-Looking Statements This Current Report, including Exhibit 99.1, may constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements may be identified by reference to a future period(s) or by the use of forward-looking terminology, such as “anticipate,” “believe,” “budget,” “contemplate,” “continue,” “estimate,” “expect,” “foresee,” “intend,” “indicate,” “likely,” “target,” “plan,” “positions,” “prospects,” “project,” “predict,” or “potential,” by future conditional verbs such as “could,” “may,” “might,” “should,” “will,” or “would,” by variations of such words, or by similar expressions. Forward-looking statements include statements relating to the Offering, which is opportunistic and subject to market conditions, the expected use of proceeds from the Offering (including any potential repositioning of the Company’s balance sheet), and the Company’s future business operations and strategy. Forward-looking statements, including those relating to our beliefs, plans, objectives, goals, expectations, anticipations, estimates and intentions, involve risks, uncertainties and other factors, which may be beyond our control, and which may cause the Company’s actual results, performance, achievements, or financial condition to be materially different from future results, performance, achievements, or financial condition expressed or implied by such forward-looking statements. You should not rely on any forward-looking statements as predictions of future events. You should not expect us to update any forward-looking statements, except as required by law. All written or oral forward-looking statements attributable to us are expressly qualified in their entirety by this cautionary notice, together with those risks and uncertainties described in “Risk factors” in our annual report on Form 10-K for the fiscal year ended December 31, 2024, filed on February 27, 2025, and in our other filings with the U.S. Securities and Exchange Commission, which are available at the SEC’s website www.sec.gov.   Item 9.01 Financial Statements and Exhibits. (d) Exhibits The following exhibits are being filed or furnished herewith:   Exhibit No.         Document 99.1       Press Release dated July 22, 2025 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 Date: July 22, 2025       /s/ C. Daniel Hobbs       C. Daniel Hobbs, Executive Vice President and Chief Financial Officer