X0306 4 2022-04-01 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 2022-04-01 4 F 0 1458 34.34 D 3816 D Common Stock 2022-04-01 4 F 0 712 34.34 D 3669 D Common Stock 2022-04-01 4 A 0 5241 34.34 A 5241 D Common Stock 175951 D Common Stock 1947 D Common Stock 27488 I Held by Spouse in Trust Common Stock 9356 D Common Stock 31343.187 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 12.63 2023-01-28 Common Stock 17975 17975 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 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. Represents an unvested time-based restricted stock award granted on December 30, 2019, which shall vest over 3 years in one-third increments, beginning December 30, 2020, and on each anniversary thereafter, subject to continued employment. Held in IRA Represents shares held in the Company's Retirement Savings Plan as of March 28, 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. Originally had two tiered vesting. Performance criteria was met and time-based vesting began on 7/1/15. 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. Vests over 5 years at the rate of 20% on the first anniversary of the date of grant (the date indicated) and then at the rate of 20% on each of the following four anniversaries thereafter, subject to continue employment. /s/ Dennis S. Hudson, III 2022-04-05