X0306 5 2017-12-31 0 0 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 1 0 0 Chairman & CEO Common Stock 31665 D Common Stock 21393 D Common Stock 21915 D Common Stock 30453.08 D Common Stock 49386 D Common Stock 224356 I Held by Sherwood Partners, Ltd., family partnership Common Stock 280 I Held by spouse as custodian for son Common Stock 20 I held by son 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 2023-01-29 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 shares subject to performance-based restricted stock units ("PSUs") granted on June 28, 2013, that were subject to performance requirements over a period ending December 31, 2015. One-third of the earned shares vested each on Dec. 31, 2016 and Dec. 31, 2017. The remaining shares will vest on Dec. 31, 2018, provided the recipient remains in continuous service with the Company on each such vesting date. Held in Trust Represents share equivalents held in the Company's Retirement Savings Plan as of December 31, 2017 Held jointly with spouse 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. Originally has 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. Two tiered vesting. Performance criteria met and time-based vesting began on 7/1/15. Option vests in equal installments at the end of each month over 48 months, provided Optionee remains in Continuous Service on each applicable vesting date. Vests over 3 years in one-third increments on 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% 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 four anniversaries thereafter, subject to continued employment. /s/ Dennis S. Hudson, III 2018-02-14