X0609 4 2026-06-16 0 0000730708 SEACOAST BANKING CORP OF FLORIDA SBCF 0001078596 HUDSON DENNIS S III false P.O. BOX 9012 815 COLORADO AVENUE STUART FL 34995-9012 1 0 0 0 1 Common Stock 2026-06-16 4 S 0 8000 31.41 D 220854 D Common Stock 18104 D Common Stock 34315.537 D Common Stock 9356 D Common Stock 21867 I Held by Spouse in Trust Common Stock 51416 I Held by Sherwood Partners, Ltd, family partnership Common Stock Right to Buy 31.15 2028-04-01 Common Stock 55279 55279 D Common Stock Right to Buy 28.69 2027-04-01 Common Stock 78021 78021 D Shares sold were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 21, 2025 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.20 to $31.64. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price for this transaction Shares held in Trust Shares held jointly with spouse Represents shares held in the Company's Retirement Savings Plan as of March 31, 2026 Held in IRA Granted pursuant to Company's 2013 Incentive Plan Vests over 3 years in one-third increments each anniversary of the date of grant beginning on the first anniversary of the date of grant (the date indicated), subject to continuous employment on each vesting date and the Company's banking subsidiary meets certain capital requirements /s/ Dennis S. Hudson, III 2026-06-17