X0306 5 2021-12-31 0 0 0 0000730708 SEACOAST BANKING CORP OF FLORIDA SBCF 0001249970 CULBRETH H GILBERT JR SEACOAST BANKING CORPORATION P. O. BOX 9012 STUART FL 34995 1 0 0 0 Common Stock 27937.4325 D Common Stock 11672 D Common Stock 10328 D Common Stock 500 D Common Stock 500 D Common Stock 26000 I Held in family limited liability company Common Stock 8200 I Held in family sub-S corporation Held in Seacoast's Non-employee Directors Deferred Compensation Plan Held jointly with spouse Held jointly with son Held jointly with daughter /s/ Kathy L. Hsu as Power of Attorney for H. Gilbert Culbreth, Jr. 2022-02-14