Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Shaffer Charles M
   2. Issuer Name and Ticker or Trading Symbol
SEACOAST BANKING CORP OF FLORIDA [SBCF] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
_____ Officer (give title below) __X__ Other (specify below)
EVP of subsidiary
(Last)
(First)
(Middle)
SEACOAST BANKING CORPORATION OF FLORIDA, P. O. BOX 9012		 3. Date of Earliest Transaction (Month/Day/Year)
04/02/2018
(Street)

STUART, FL 34995		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 04/02/2018   A   10,785 A $ 25.96 10,785 D (1)  
Common Stock 04/01/2018   F   1,500 D $ 26.47 7,220 D (2)  
Common Stock               8,170 D (3)  
Common Stock               2,257 D (4)  
Common Stock               14,343 D  
Common Stock               844.13 D (5)  
Common Stock               1,571 D (6)  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Common Stock Right to Buy (7) $ 31.15 04/02/2018   A   18,952     (8) 04/02/2028 Common Stock 18,952 $ 0 (7) 18,952 D  
Common Stock Right to Buy (7) $ 28.69               (8) 04/03/2027 Common Stock 28,544   28,544 D  
Common Stock Right to Buy (7) $ 14.82               (9) 02/28/2024 Common Stock 21,255   21,255 D  
Common Stock Right to Buy (7) $ 12.63               (10) 01/28/2023 Common Stock 8,100   8,100 D  
Common Stock Right to Buy (7) $ 10.54             04/29/2015(11) 04/29/2024 Common Stock 25,000   25,000 D  
Common Stock Right to Buy (7) $ 11             06/28/2014(12) 06/28/2023 Common Stock 2,400   2,400 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Shaffer Charles M
SEACOAST BANKING CORPORATION OF FLORIDA
P. O. BOX 9012
STUART, FL 34995		       EVP of subsidiary

Signatures

 /s/ Dennis S. Hudson, III as Power of Attorney for Charles M. Shaffer   04/04/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Represents shares of restricted stock units ("RSUs") granted on April 2, 2018. One-third of the shares vest on each of April 2, 2019, 2020 and 2021, provided the recipient remains in continuous service with the Company on each such vesting date.
(2) Represents shares of restricted stock units ("RSUs") granted on April 3, 2017. One-third of the shares vest on each of April 3, 2018, 2019 and 2020, provided the recipient remains in continuous service with the Company on each such vesting date.
(3) Represents shares subject to performance-based restricted stock units ("PSUs") granted on June 28, 2013, that were subject to performance requirements which were attained over a period ending Dec. 31, 2015. One-third of the earned shares vested each on Dec. 31, 2016 and Dec. 31, 2017. The remaining shares shall vest on Dec. 31, 2018, provided the recipient remains in continuous service with the Company on each such vesting date.
(4) Shares in the Company's Employee Stock Purchase Plan.
(5) Share equivalents held in Company's Retirement Savings Plan as of December 30, 2017
(6) Held jointly with spouse
(7) Granted pursuant to the Company's Amended and Restated 2013 Incentive Plan.
(8) 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.
(9) 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.
(10) 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.
(11) 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.
(12) 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.

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