X0306 4 2022-04-01 0 0000730708 SEACOAST BANKING CORP OF FLORIDA SBCF 0001815460 DEXTER TRACEY P.O. BOX 9012 STUART FL 34995 0 1 0 0 EVP & CFO Common Stock 2022-04-01 4 F 0 151 34.34 D 0 D Common Stock 2022-04-01 4 F 0 141 34.34 D 597 D Common Stock 2022-04-01 4 F 0 138 34.34 D 1147 D Common Stock 2022-04-01 4 A 0 2912 34.34 A 2912 D Common Stock 7845 D Common Stock 153 D Common Stock 344 D Common Stock Right to Buy 31.15 2028-04-02 Common Stock 2842 2842 D Represents an unvested time-based restricted stock award granted on October 1, 2019, which shall vest over 3 years in one-third increments, beginning April 1, 2020, and on each anniversary thereafter, subject to continued employment. 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. Represents 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. Shares in the Company's Employee Stock Purchase Plan. 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 continued employment. /s/ Kathy L. Hsu as Power of Attorney for Tracey Dexter 2022-04-05