X0306 4 2023-02-02 0 0000730708 SEACOAST BANKING CORP OF FLORIDA SBCF 0001078596 HUDSON DENNIS S III SEACOAST BANKING CORP. OF FLORIDA P.O. BOX 9012 STUART FL 34995 1 0 0 0 Common Stock 2023-02-02 4 S 0 8078 33.01 D 160538 D Common Stock 21867 I Held by Spouse in Trust Common Stock 3816 D Common Stock 3669 D Common Stock 5241 D Common Stock 9356 D Common Stock 31392.468 D Common Stock 18104 D Common Stock 51416 I Held by Sherwood Partners, Ltd, family partnership Common Stock Right to Buy 31.15 2028-04-02 Common Stock 55279 55279 D Common Stock Right to Buy 28.69 2027-04-03 Common Stock 78021 78021 D Common Stock Right to Buy 14.82 2024-02-28 Common Stock 51956 51956 D Common Stock Right to Buy 10.54 2015-04-29 2024-04-29 Common Stock 50000 50000 D Common Stock Right to Buy 11.00 2014-06-28 2023-06-27 Common Stock 19400 19400 D The price reported in Column 4 is a weighted average price, of which 6,331 shares were sold at $32.9961 and 1,747 shares were sold at $33.0602. 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 Represents an unvested time-based restricted stock award granted on April 1, 2020, which shall vest over 3 years in one-third increments, beginning April 1, 2021, and on each anniversary thereafter, subject to continued employment. Represents an unvested time-based restricted stock award granted on April 1, 2021, which shall vest over 3 years in one-third increments, beginning April 1, 2022, and on each anniversary thereafter, subject to continued employment. Represents an unvested time-based restricted stock award granted on April 1, 2022, which shall vest over 3 years in one-third increments, beginning April 1, 2023, and on each anniversary thereafter, subject to continued employment. Held in IRA Represents shares held in the Company's Retirement Savings Plan as of December 31, 2022 Shares held jointly with spouse Granted pursuant to the Company's Amended and Restated 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. Originally had two tiered vesting. The performance criteria was met and the time-based vesting began on 12/1/2016. Option vests in equal installments at the end of each month over the next 48 months, provided that Optionee remains in continuous service on each applicable vesting date. 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 continued employment. /s/ Dennis S. Hudson, III 2023-02-06