SIMMONS FIRST NATIONAL CORP 10-K

ITEM 9A. CONTROLS AND PROCEDURES (a) Evaluation of Disclosure Controls and Procedures. Under the supervision and with the participation of our management, including the Company’s Chief Executive Officer, Chief Financial Officer and Chief Accounting Officer, an evaluation of the effectiveness of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) and Rule 15d-15(e) under the Exchange Act) was carried out as of the end of the period covered by this Annual Report on Form 10-K. Based upon that evaluation, the Chief Executive Officer, Chief Financial Officer and Chief Accounting Officer have concluded that the Company’s current disclosure controls and procedures were effective as of the end of the period covered by this report. (b) Changes in Internal Controls. Our management, including the Company’s Chief Executive Officer, Chief Financial Officer and Chief Accounting Officer, regularly review our disclosure controls and procedures and make changes intended to ensure the quality of our financial reporting. There were no changes in our internal control over financial reporting during the Company’s fourth quarter of its 2025 fiscal year that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting. (c) Management’s Report on Internal Control Over Financial Reporting. Management’s report on internal control over financial reporting, as well as the audit report of Forvis Mazars, LLP on the Company’s internal control over financial reporting are included in Item 8, Consolidated Financial Statements and Supplementary Data, of this Annual Report on Form 10-K and are incorporated herein by this reference. ITEM 9B. OTHER INFORMATION Trading Arrangements During the three months ended December 31, 2025 , none of our directors or officers (as defined in Rule 16a-1(f) of the Securities Exchange Act of 1934, as amended) adopted , modified or terminated a Rule 10b5-1 trading arrangement or non-Rule 10b5-1 trading arrangement (as such terms are defined in Item 408 of Regulation S-K of the Securities Act of 1933). Amended and Restated By-Laws On February 25, 2026, the Company’s board of directors (“Board”) adopted amended and restated by-laws of the Company (“Amended and Restated By-Laws”), effective as of such date. In addition to certain technical and administrative revisions, the Amended and Restated By-Laws clarify the role and responsibilities of the Chairman and Vice Chairman of the Board in new Article III, Section 3 and remove the Chairman of the Board from the list of required officers of the Company in Article IV, Section 1. The foregoing description of the Amended and Restated By-Laws does not purport to be complete and is qualified in its entirety by reference to the full text of the Amended and Restated By-Laws, a copy of which is attached as Exhibit 3.3 to this Annual Report on Form 10-K and is incorporated by reference herein. ITEM 9C. DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS Not applicable. 137 PART III ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE This information is incorporated herein by reference from the Company’s definitive proxy statement for the Annual Meeting of Shareholders to be held May 13, 2026 , to be filed pursuant to Regulation 14A within 120 days of the Company’s fiscal year-end (the “Proxy Statement”) under the captions “Proposal 2 - Election of Directors,” “Audit Committee,” “Delinquent Section 16(a) Reports,” as applicable, “Codes of Ethics,” “ Executive Officers,” “Insider Trading Policy” and the last two paragraphs under the caption “Transactions with Related Persons.” Executive Officers The table below also sets forth the names and principal occupations of the Company’s executive officers. Name Principal Occupation James M. Brogdon President and Chief Executive Officer* C. Daniel Hobbs Executive Vice President and Chief Financial Officer* Christopher Van Steenberg Executive Vice President and Chief Operating Officer* George A. Makris III Executive Vice President, General Counsel and Secretary* Jennifer B. Compton Executive Vice President and Chief People Officer* David W. Garner Executive Vice President and Chief Accounting Officer* Tina Groves Executive Vice President and Chief Risk Officer* Brad Yaney Executive Vice President of Credit Risk Management, Simmons Bank Brian Jackson Executive Vice President and President of Consumer and Wealth Management* Jonathan Schneider Executive Vice President and President of Commercial Banking* _________________ * The officer holds the positions at both the Company and Simmons Bank. Directors The table below also sets forth the names, principal occupations, and employers of the Company’s directors. Name Principal Occupation and Employer James M. Brogdon President and Chief Executive Officer, the Company and Simmons Bank Marty D. Casteel Retired Senior Executive Vice President of the Company; Retired Chairman, President and Chief Executive Officer of Simmons Bank William E. Clark, II Chief Executive Officer, Clark Contractors, LLC Steven A. Cossé Retired President and Chief Executive Officer, Murphy Oil Corporation Mark C. Doramus Chief Financial Officer, Stephens Inc. Edward Drilling Retired Senior Vice President of External and Regulatory Affairs, AT&T Inc. Eugene Hunt Attorney, Hunt Law Firm Jerry Hunter Senior Counsel, Bryan Cave Leighton Paisner LLP Susan Lanigan Retired Executive Vice President and General Counsel, Chico’s FAS, Inc. Tom Purvis Partner, L2L Development Advisors, LLC Robert L. Shoptaw Retired Executive, Arkansas Blue Cross and Blue Shield Julie Stackhouse Retired Executive Vice President, Federal Reserve Bank of St. Louis Russell W. Teubner Distinguished Engineer, Broadcom, Inc. Mindy West President and Chief Executive Officer, Murphy USA Inc. Code of Ethics We have adopted a written Code of Ethics that applies to directors, officers and employees, including our Chief Executive Officer, Chief Financial Officer, Chief Accounting Officer, in accordance with Section 406 of the Sarbanes‑Oxley Act of 2002 and the rules of the SEC promulgated thereunder. This code of ethics has been filed as Exhibit 14.1 to this Annual Report on Form 10-K. We have also adopted a separate written Code of Ethics that applies to officers within the finance group of the Company. This code of ethics has been filed as Exhibit 14.2 to this Annual Report on Form 10-K. 138 Insider Trading Policy The Company has adopted insider trading policies and procedures governing the purchase, sale, and/or other dispositions of the Company’s securities by directors, officers and employees, or the Company itself, that are reasonably designed to promote compliance with insider trading laws, rules and regulations, and any listing standards applicable to the Company. A copy of the Company’s Trading Policy has been filed as Exhibit 19 to this Annual Report on Form 10-K. We believe that our Insider Trading Policy is reasonably designed to promote compliance with insider trading laws, rules and regulations, and any stock exchange listing standards applicable to the Company. ITEM 11. EXECUTIVE COMPENSATION This information is incorporated herein by reference from the Proxy Statement under the captions “Compensation Committee Interlocks and Insider Participation,” “Compensation Discussion and Analysis,” “Relationship of Compensation Policies and Practices to Risk Management,” “Summary of Compensation and Other Payments to the Named Executive Officers,” “2025 Pay Ratio Disclosure,” “Director Compensation,” and “2025 Director Compensation.” ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS This information is incorporated herein by reference from the Proxy Statement under the captions “Security Ownership of Certain Beneficial Owners” and “Equity Compensation Plan Information.” ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE This information is incorporated herein by reference from the Proxy Statement under the captions “Transactions with Related Persons,” “Policies and Procedures for Approval of Related Party Transactions,” and the first two paragraphs under the caption “Proposal 2 – Election of Directors.” ITEM 14. PRINCIPAL ACCOUNTANT FEES AND SERVICES This information is incorporated herein by reference from the Proxy Statement under the caption “Principal Accountant Fees” and the fourth paragraph under the caption “Audit Committee.” 139 PART IV ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES (a) 1 and 2. Financial Statements and any Financial Statement Schedules The financial statements and financial statement schedules listed in the accompanying index to the consolidated financial statements and financial statement schedules are filed as part of this report. (b) Listing of Exhibits Exhibit No. Description 2.1 Agreement and Plan of Merger, dated as of June 4, 2021, by and among Simmons First National Corporation, Simmons Bank and Landmark Community Bank (incorporated by reference to Annex A to the Registration Statement on Form S-4 filed under the Securities Act of 1933 by Simmons First National Corporation on July 21, 2021 (File No. 333-258059)). 2.2 Agreement and Plan of Merger, dated as of June 4, 2021, by and between Simmons First National Corporation and Triumph Bancshares, Inc. (incorporated by reference to Annex B to the Registration Statement on Form S-4 filed under the Securities Act of 1933 by Simmons First National Corporation on July 21, 2021 (File No. 333-258059)). 2.3 Agreement and Plan of Merger, dated as of November 18, 2021, by and between Simmons First National Corporation and Spirit of Texas Bancshares, Inc. (incorporated by reference to Annex A to the Registration Statement on Form S-4 filed under the Securities Act of 1933 by Simmons First National Corporation on January 18, 2022 (File No. 333-261842)). 3.1 Amended and Restated Articles of Incorporation of Simmons First National Corporation, as amended on July 14, 2021 (incorporated by reference to Exhibit 3.1 to the Registration Statement on Form S-4 filed under the Securities Act of 1933 by Simmons First National Corporation on July 21, 2021 (File No. 333-258059)). 3.2 Articles of Amendment to the Amended and Restated Articles of Incorporation of Simmons First National Corporation, dated August 3, 2022 (incorporated by reference to Exhibit 3.2 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2022 (File No. 000-06253)). 3.3 Amended and Restated By-Laws of Simmons First National Corporation.* 4.1 Instruments defining the rights of security holders, including indentures. Simmons First National Corporation hereby agrees to furnish copies of instruments defining the rights of holders of long-term debt of the Corporation and its consolidated subsidiaries to the U.S. Securities and Exchange Commission upon request. No issuance of debt exceeds ten percent of the total assets of the Corporation and its subsidiaries on a consolidated basis. 4.2 Description of Registrant’s Securities (incorporated by reference to Exhibit 4.2 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2024 (File No. 000-06253)). 10.1 Second Amended and Restated Simmons First National Corporation 2015 Incentive Plan (incorporated by reference to Exhibit 10.1 to Amendment No. 1 to Simmons First National Corporation’s Current Report on Form 8-K filed on April 7, 2020 (File No. 000-06253)).^ 10.2 Form of Associate Restricted Stock Unit Award Certificate and Terms and Conditions (incorporated by reference to Exhibit 10.2 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2020 (File No. 000-06253)).^ 10.3 Form of Associate Restricted Stock Unit Award Certificate and Terms and Conditions (2022) (incorporated by reference to Exhibit 10.2 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2022 (File No. 000-06253)).^ 10.4 Form of Associate Performance Share Unit Award Certificate and Terms and Conditions (2020) (incorporated by reference to Exhibit 10.3 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2020 (File No. 000-06253)).^ 140 Exhibit No. Description 10.5 Form of Associate Performance Share Unit Award Certificate and Terms and Conditions (2021) (incorporated by reference to Exhibit 10.4 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2021 (File No. 000-06253)).^ 10.6 Form of Associate Performance Share Unit Award Certificate and Terms and Conditions (2022) (incorporated by reference to Exhibit 10.3 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2022 (File No. 000-06253)).^ 10.7 Form of Associate Cash Award Certificate and Terms and Conditions (incorporated by reference to Exhibit 10.5 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2021 (File No. 000-06253)).^ 10.8 Form of Associate Cash Award Certificate and Terms and Conditions (2022) (incorporated by reference to Exhibit 10.4 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2022 (File No. 000-06253)).^ 10.9 Form of Director Restricted Stock Unit Award Certificate and Terms and Conditions (incorporated by reference to Exhibit 10.5 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2020 (File No. 000-06253)).^ 10.10 Form of Director Restricted Stock Unit Award Certificate and Terms and Conditions (2022) (incorporated by reference to Exhibit 10.5 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2022 (File No. 000-06253)).^ 10.11 Deferred Compensation Agreement for Marty D. Casteel dated January 22, 2018 (incorporated by reference to Exhibit 10.3 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2017 (File No. 000-06253)).^ 10.12 Deferred Compensation Agreement for George A. Makris, Jr. dated January 2, 2013 (incorporated by reference to Exhibit 10.2 to Simmons First National Corporation’s Current Report on Form 8-K filed on January 7, 2013 (File No. 000-06253)).^ 10.13 Amendment to Deferred Compensation Agreement for George A. Makris, Jr. dated January 25, 2018 (incorporated by reference to Exhibit 10.4 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2017 (File No. 000-06253)).^ 10.14 Amended and Restated Deferred Compensation Agreement for Robert A. Fehlman effective February 27, 2017 (incorporated by reference to Exhibit 10.25 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2016 (File No. 000-06253)).^ 10.15 First Amended and Restated Executive Change in Control Severance Agreement for George A. Makris, Jr. dated March 26, 2021 (incorporated by reference to Exhibit 10.2 to Simmons First National Corporation’s Current Report on Form 8-K filed on April 1, 2021 (File No. 000-06253)).^ 10.16 Simmons Bank Endorsement Split-Dollar Life Insurance Plan (incorporated by reference to Exhibit 10.16 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2024 (File No. 000-06253)).^ 10.17 Deferred Compensation Agreement for Marty D. Casteel dated January 25, 2010 (incorporated by reference to Exhibit 10.3 to Simmons First National Corporation’s Current Report on Form 8-K filed on January 29, 2010 (File No. 000-06253)).^ 10.18 Amended and Restated Executive Severance Agreement for Robert A. Fehlman dated March 1, 2006 (incorporated by reference to Exhibit 10.3 to Simmons First National Corporation’s Current Report on Form 8-K filed on March 2, 2006 (File No. 000-06253)).^ 10.19 First Amendment to Amended and Restated Executive Severance Agreement for Robert A. Fehlman dated March, 1, 2006. (incorporated by reference to Exhibit 10.14 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2020 (File No. 000-06253)).^ 141 Exhibit No. Description 10.20 Second Amendment to Amended and Restated Executive Severance Agreement for Robert A. Fehlman dated March 1, 2006. (incorporated by reference to Exhibit 10.15 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2020 (File No. 000-06253)).^ 10.21 Deferred Compensation Agreement for Jennifer B. Compton dated February 28, 2017 (incorporated by reference to Exhibit 10.11 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2019 (File No. 000-06235)).^ 10.22 First Amendment to Deferred Compensation Agreement for Jennifer B. Compton dated July 27, 2022 (incorporated by reference to Exhibit 10.1 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2022 (File No. 000-06235)).^ 10.23 First Amended and Restated Executive Change in Control Severance Agreement for Jennifer B. Compton dated March 26, 2021 (incorporated by reference to Exhibit 10.5 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021 (File No. 000-06253)).^ 10.24 First Amended and Restated Executive Change in Control Severance Agreement for David Garner dated March 26, 2021 (incorporated by reference to Exhibit 10.7 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021 (File No. 000-06253)).^ 10.25 First Amended and Restated Executive Change in Control Severance Agreement for George A. Makris III dated March 26, 2021 (incorporated by reference to Exhibit 10.6 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021 (File No. 000-06253)).^ 10.26 Deferred Compensation Agreement for George A. Makris III dated March 11, 2022 (incorporated by reference to Exhibit 10.1 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2022 (File No. 000-06253)).^ 10.27 First Amendment to Deferred Compensation Agreement for George A. Makris III dated July 27, 2022 (incorporated by reference to Exhibit 10.2 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2022 (File No. 000-06235)).^ 10.28 Deferred Compensation Agreement for David Garner dated January 2, 2020 (incorporated by reference to Exhibit 10.1 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2020 (File No. 000-06253)).^ 10.29 Form of Indemnification Agreement (incorporated by reference to Exhibit 10.1 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2021 (File No. 000-06253)).^ 10.30 Indemnification Agreement for James M. Brogdon dated July 30, 2021 (incorporated by reference to Exhibit 10.1 to Simmons First National Corporation’s Current Report on Form 8-K filed on August 5, 2021 (File No. 000-06253)).^ 10.31 Executive Change in Control Severance Agreement for James M. Brogdon dated July 30, 2021 (incorporated by reference to Exhibit 10.2 to Simmons First National Corporation’s Current Report on Form 8-K filed on August 5, 2021 (File No. 000-06253)).^ 10.32 Deferred Compensation Agreement for James M. Brogdon dated July 30, 2021 (incorporated by reference to Exhibit 10.3 to Simmons First National Corporation’s Current Report on Form 8-K filed on August 5, 2021 (File No. 000-06253)).^ 10.33 Simmons First National Corporation Directors Deferred Compensation Plan (Amended and Restated Effective December 31, 2022) (incorporated by reference to Exhibit 10.36 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2022 (File No. 000-06253)).^ 10.34 Second Amendment to Deferred Compensation Agreement for George A. Makris, Jr. dated January 25, 2023 (incorporated by reference to Exhibit 10.1 to Simmons First National Corporation’s Current Report on Form 8-K filed January 25, 2023 (File No. 000-06253)).^ 10.35 Form of Associate Restricted Stock Unit Award Certificate and Terms of Conditions (2015 Plan - 2023) (incorporated by reference to Exhibit 10.2 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 (File No. 000-06253)).^ 142 Exhibit No. Description 10.36 Form of Associate Performance Share Unit Award Certificate and Terms and Conditions (2015 Plan - 2023) (incorporated by reference to Exhibit 10.3 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 (File No. 000-06253)).^ 10.37 Form of Associate Cash Award Certificate and Terms and Conditions (2015 Plan - 2023) (incorporated by reference to Exhibit 10.4 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 (File No. 000-06253)).^ 10.38 Executive Change in Control Severance Agreement for Tina Groves dated May 7, 2021 (incorporated by reference to Exhibit 10.38 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2024 (File No. 000-06253)).^ 10.39 Indemnification Agreement for Tina Groves dated May 7, 2021 (incorporated by reference to Exhibit 10.39 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2024 (File No. 000-06253)).^ 10.40 Executive Change in Control Severance Agreement for Christopher Van Steenberg dated February 25, 2025 (incorporated by reference to Exhibit 10.40 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2024 (File No. 000-06253)).^ 10.41 Indemnification Agreement for Christopher Van Steenberg dated February 25, 2025 (incorporated by reference to Exhibit 10.41 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2024 (File No. 000-06253)).^ 10.42 Executive Change in Control Severance Agreement for Brad Yaney dated November 4, 2022 (incorporated by reference to Exhibit 10.9 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 (File No. 000-06253)).^ 10.43 Indemnification Agreement for Brad Yaney dated November 4, 2022 (incorporated by reference to Exhibit 10.10 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 (File No. 000-06253)).^ 10.44 Simmons First National Corporation 2023 Stock and Incentive Plan (incorporated by reference to Exhibit 10.1 to Simmons First National Corporation’s Current Report on Form 8-K filed on April 19, 2023 (File No. 000-06253)).^ 10.45 Form of Non-Employee Director Restricted Stock Unit Award Agreement (2023 Plan – for awards on or after April 18, 2023) (incorporated by reference to Exhibit 10.2 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2023 (File No. 000-06253)).^ 10.46 Form of Associate Restricted Stock Unit Award Agreement (2023 Plan – for awards on or after May 23, 2023) (incorporated by reference to Exhibit 10.3 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2023 (File No. 000-06253)).^ 10.47 Indemnification Agreement for C. Daniel Hobbs dated January 25, 2024 (incorporated by reference to Exhibit 10.1 to Simmons First National Corporation’s Current Report on Form 8-K filed on January 26, 2024 (File No. 000-06253)).^ 10.48 Executive Change in Control Severance Agreement for C. Daniel Hobbs dated January 25, 2024 (incorporated by reference to Exhibit 10.2 to Simmons First National Corporation’s Current Report on Form 8-K filed on January 26, 2024 (File No. 000-06253)).^ 10.49 Deferred Compensation Agreement for C. Daniel Hobbs dated January 25, 2024 (incorporated by reference to Exhibit 10.3 to Simmons First National Corporation’s Current Report on Form 8-K filed on January 26, 2024 (File No. 000-06253)).^ 10.50 Aircraft Time Sharing Agreement between Simmons First National Corporation and Steve Cossé, dated July 1, 2024 (incorporated by reference to Exhibit 10.1 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2024 (File No. 000-06253)). 143 Exhibit No. Description 10.51 Form of Associate Restricted Stock Unit Award Agreement (2023 Plan – 2024 Form) (incorporated by reference to Exhibit 10.1 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2024 (File No. 000-06253)).^ 10.52 Form of Performance Cash Award Agreement (2023 Plan – 2024 Form) (incorporated by reference to Exhibit 10.2 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2024 (File No. 000-06253)).^ 10.53 Form of Performance Share Unit Award Agreement (2023 Plan – 2024 Form) (incorporated by reference to Exhibit 10.3 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2024 (File No. 000-06253)).^ 10.54 Form of Associate Restricted Stock Unit Award Agreement (2023 Plan - 2025 Form) (incorporated by reference to Exhibit 10.2 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 (File No. 000-06253)).^ 10.55 Form of Performance Cash Award Agreement (2023 Plan - 2025 Form) (incorporated by reference to Exhibit 10.3 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 (File No. 000-06253)).^ 10.56 Form of Performance Share Unit Award Agreement (2023 Plan - 2025 Form) (incorporated by reference to Exhibit 10.4 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 (File No. 000-06253)).^ 10.57 Form of Performance Cash Award Agreement - Chief Risk Officer (2023 Plan - 2025 Form) (incorporated by reference to Exhibit 10.7 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 (File No. 000-06253)).^ 10.58 Form of Performance Share Unit Award Agreement - Chief Executive Officer (2023 Plan - 2025 Form) (incorporated by reference to Exhibit 10.8 to Simmons First National Corporation’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 (File No. 000-06253)).^ 10.59 Aircraft Time Sharing Agreement between Simmons First National Corporation and George Makris, Jr, dated December 23, 2025 (incorporated by reference to Exhibit 10.1 to Simmons First National Corporation’s Current Report on Form 8-K filed on December 23, 2025 (File No. 000-06253)). 14.1 Simmons First National Corporation Code of Ethics (as amended and restated on December 19, 2023) (incorporated by reference to Exhibit 14.1 to Simmons First National Corporation’s Current Report on Form 8-K filed on December 26, 2023 (File No. 000-06253)). 14.2 Simmons First National Corporation Finance Group Code of Ethics, (as amended and restated on December 19, 2023) (incorporated by reference to Exhibit 14.2 to Simmons First National Corporation’s Current Report on Form 8-K filed on December 26, 2023 (File No. 000-06253)). 19 Simmons First National Corporation Insider Trading Policy (incorporated by reference to Exhibit 19 to Simmons First National Corporation’s Annual Report on Form 10-K for the year ended December 31, 2024 (File No. 000-06253)). 21 Subsidiaries of the Registrant.* 23 Consent of Forvis Mazars, LLP.* 31.1 Rule 13a-15(e) and 15d-15(e) Certification – James M. Brogdon, President and Chief Executive Officer.* 31.2 Rule 13a-15(e) and 15d-15(e) Certification – C. Daniel Hobbs, Executive Vice President and Chief Financial Officer.* 31.3 Rule 13a-15(e) and 15d-15(e) Certification – David W. Garner, Executive Vice President and Chief Accounting Officer.* 32.1 Certification Pursuant to 18 U.S.C. Sections 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 – James M. Brogdon, President and Chief Executive Officer.* 144 Exhibit No. Description 32.2 Certification Pursuant to 18 U.S.C. Sections 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 – C. Daniel Hobbs, Executive Vice President and Chief Financial Officer.* 32.3 Certification Pursuant to 18 U.S.C. Sections 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 – David W. Garner, Executive Vice President and Chief Accounting Officer.* 97 Simmons First National Corporation Compensation Clawback Policy.*^ 101.INS XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document. * / ** 101.SCH Inline XBRL Taxonomy Extension Schema.* / ** 101.CAL Inline XBRL Taxonomy Extension Calculation Linkbase.* / ** 101.DEF Inline XBRL Taxonomy Extension Definition Linkbase.* / ** 101.LAB Inline XBRL Taxonomy Extension Labels Linkbase. * / ** 101.PRE Inline XBRL Taxonomy Extension Presentation Linkbase.* / ** 104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101). ** ______________________________________________________________________________________________ * Filed herewith ** Pursuant to Rule 406T of Regulation S-T, these interactive data files are deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, are deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and otherwise are not subject to liability under those sections. ^ Management contract or a compensatory plan or arrangement. ITEM 16. FORM 10-K SUMMARY None. 145 SIGNATURES Pursuant to the requirements of Section 13 or 15 (d) 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. /s/ James M. Brogdon February 25, 2026 James M. Brogdon, President and Chief Executive Officer Pursuant to the requirements of the Securities and Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities indicated on or about February 25, 2026. Signature Title /s/ Marty D. Casteel Chairman and Director Marty D. Casteel /s/ James M. Brogdon President, Chief Executive Officer and Director James M. Brogdon (Principal Executive Officer) /s/ C. Daniel Hobbs Executive Vice President and Chief Financial Officer C. Daniel Hobbs (Principal Financial Officer) /s/ David W. Garner Executive Vice President and Chief Accounting Officer David W. Garner (Principal Accounting Officer) /s/ William E. Clark, II Director William E. Clark, II /s/ Steven A. Cossé Director Steven A. Cossé /s/ Mark C. Doramus Director Mark C. Doramus /s/ Edward Drilling Director Edward Drilling /s/ Eugene Hunt Director Eugene Hunt /s/ Jerry M. Hunter Director Jerry M. Hunter /s/ Susan Lanigan Director Susan Lanigan /s/ Tom Purvis Director Tom Purvis 146 /s/ Robert L. Shoptaw Director Robert L. Shoptaw /s/ Julie Stackhouse Director Julie Stackhouse /s/ Russell W. Teubner Director Russell W. Teubner /s/ Mindy West Director Mindy West 147