X0306 4 2021-11-30 0 0000730708 SEACOAST BANKING CORP OF FLORIDA SBCF 0001627974 Shaffer Charles M SEACOAST BANKING CORPORATION OF FLORIDA P. O. BOX 9012 STUART FL 34995 1 1 0 0 President & CEO Common Stock 2021-11-30 4 P 0 225 34.05 A 57111 D Common Stock 3102 D Common Stock 27382 D Common Stock 2192 D Common Stock 5416 D Common Stock 1074.668 D Common Stock Right to Buy 31.15 2028-04-02 Common Stock 18952 18952 D Common Stock Right to Buy 28.69 2027-04-03 Common Stock 28544 28544 D Common Stock Right to Buy 14.82 2024-02-28 Common Stock 21255 21255 D Common Stock Right to Buy 12.63 2023-01-28 Common Stock 8100 8100 D Common Stock Right to Buy 10.54 2015-04-29 2024-04-29 Common Stock 25000 25000 D Common Stock Right to Buy 11.00 2014-06-28 2023-06-28 Common Stock 2400 2400 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 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. Share equivalents held in Company's Retirement Savings Plan as of September 30, 2021 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. Performance criteria was met and 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 vesting criteria has been met and time-based vesting began on 7/1/2015. Option vests in equal installments over the next 48 months, provided the 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), and then at the rate of 20% on each of the following two anniversaries thereafter 20%, subject to continued employment. Vests over 5 years at the rate of 20% on the first anniversary of the date of grant and then at the rate of 20% on each of the following four anniversaries thereafter, subject to continued employment. /s/ Charles M. Shaffer 2021-12-01