SEACOAST BANKING CORP OF FLORIDA 10-Q

Item 5. Other Information Trading arrangements On February 29, 2024 , Dennis S. Hudson, III , a member of the Company’s Board of Directors , adopted a written plan for the sale of our common stock that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act (the “Trading Plan”). The Trading Plan covers the sale of up to 60,000 shares of the Company’s common stock in several transactions over a period commencing after the later of (1) 91 days from the adoption of the Trading Plan or (2) the earlier of (a) the third business day following the public disclosure of the Company’s financial results on Form 10-Q for the quarter ended March 31, 2024, or (b) 121 days after the plan adoption date, and will cease upon the earlier of January 31, 2025 or the sale of all shares subject to the Trading Plan. There were no other Rule 10b5-1 or non-Rule 10b5-1 trading arrangements adopted , modified or terminated by any director or officer of the Company during the three months ended March 31, 2024. 53 T a b l e o f C o n t e n t s Item 6. Exhibits Exhibit 3.1.1 Amended and Restated Articles of Incorporation Incorporated herein by reference from Exhibit 3.1 to the Company’s Quarterly Report on Form 10-Q, filed May 10, 2006. Exhibit 3.1.2 Articles of Amendment to the Amended and Restated Articles of Incorporation Incorporated herein by reference from Exhibit 3.1 to the Company’s Form 8-K, filed December 23, 2008. Exhibit 3.1.3 Articles of Amendment to the Amended and Restated Articles of Incorporation Incorporated herein by reference from Exhibit 3.4 to the Company’s Form S-1, filed June 22, 2009. Exhibit 3.1.4 Articles of Amendment to the Amended and Restated Articles of Incorporation Incorporated herein by reference from Exhibit 3.1 to the Company’s Form 8-K, filed July 20, 2009. Exhibit 3.1.5 Articles of Amendment to the Amended and Restated Articles of Incorporation Incorporated herein by reference from Exhibit 3.1 to the Company’s Form 8-K, filed December 3, 2009. Exhibit 3.1.6 Articles of Amendment to the Amended and Restated Articles of Incorporation Incorporated herein by reference from Exhibit 3.1 to the Company’s Form 8-K/A, filed July 14, 2010. Exhibit 3.1.7 Articles of Amendment to the Amended and Restated Articles of Incorporation Incorporated herein by reference from Exhibit 3.1 to the Company’s Form 8-K, filed June 25, 2010. Exhibit 3.1.8 Articles of Amendment to the Amended and Restated Articles of Incorporation Incorporated herein by reference from Exhibit 3.1 to the Company’s Form 8-K, filed June 1, 2011. Exhibit 3.1.9 Articles of Amendment to the Amended and Restated Articles of Incorporation Incorporated herein by reference from Exhibit 3.1 to the Company’s Form 8-K, filed December 13, 2013. Exhibit 3.1.10 Articles of Amendment to the Amended and Restated Articles of Incorporation Incorporated herein by reference from Exhibit 3.1 to the Company’s Form 8K, filed May 30, 2018. Exhibit 3.1.1 1 Articles of Amendment to the Amended and Restated Articles of Incorporation Incorporated herein by reference from Exhibit 3.1 to the Company’s Form 8K, filed May 23, 2023. Exhibit 3.2 Amended and Restated By-laws of the Company Incorporated herein by reference from Exhibit 3.1 to the Company’s Form 8-K, filed October 26, 2020. Exhibit 31.1 Certification of the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. Exhibit 31.2 Certification of the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. Exhibit 32.1 Statement of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350, Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. Exhibit 32.2 Statement of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. 54 T a b l e o f C o n t e n t s Exhibit 101 The following materials from Seacoast Banking Corporation of Florida’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2024 formatted in Inline XBRL: (i) the Consolidated Statements of Income, (ii) the Consolidated Statements of Comprehensive Income, (iii) the Consolidated Balance Sheets, (iv) the Consolidated Statements of Cash Flows, (v) the Consolidated Statements of Shareholders’ Equity and (vi) the Notes to the Consolidated Financial Statements, tagged as blocks of text and including detailed tags. Exhibit 104 The cover page from the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2024, formatted in Inline XBRL. 55 T a b l e o f C o n t e n t s SIGNATURES 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. SEACOAST BANKING CORPORATION OF FLORIDA May 8, 2024 /s/ Charles M. Shaffer Charles M. Shaffer Chairman and Chief Executive Officer May 8, 2024 /s/ Tracey L. Dexter Tracey L. Dexter Executive Vice President and Chief Financial Officer 56