Sec Form 4 Filing - CROSS CHARLES K JR. @ SEACOAST BANKING CORP OF FLORIDA - 2017-04-03

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 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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1. Name and Address of Reporting Person CROSS CHARLES K JR. 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 (MM/DD/YY) 04/03/2017 (Street) STUART, FL34995 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 04/03/2017 A 8,782 A $ 23.91 8,782 D ( 1 ) Common Stock 17,869 D ( 2 ) Common Stock 976 D ( 3 ) Common Stock 9,484 D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 ( 4 ) $ 23.91 04/03/2017 A 24,738 ( 5 ) 04/03/2027 Common Stock 24,738 $ 0 ( 4 ) 24,738 D Common Stock Right to Buy ( 4 ) $ 14.82 ( 6 ) 02/28/2024 Common Stock 24,561 24,561 D Common Stock Right to Buy ( 4 ) $ 12.63 ( 7 ) 01/29/2023 Common Stock 9,875 9,875 D Common Stock Right to Buy ( 4 ) $ 10.54 04/29/2015( 8 ) 04/29/2024 Common Stock 25,000 25,000 D Common Stock Right to Buy ( 4 ) $ 11 06/28/2014( 9 ) 06/28/2023 Common Stock 2,400 2,400 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other CROSS CHARLES K JR. SEACOAST BANKING CORPORATION OF FLORIDA P. O. BOX 9012 STUART, FL34995 EVP of subsidiary Signatures /s/ Dennis S. Hudson, III as Power of Attorney for Charles K. Cross, Jr. 04/05/2017 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents shares subject to performance-contingent 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 and the Company's banking subsidiary meets certain capital requirements. ( 2 )Represents shares subject to performance-based restricted stock units ("PSUs") granted on June 28, 2013 and on August 1, 2014, that were subject to performance requirements which were attained over a period ending December 31, 2015. One third of the earned shares vested on Dec. 31, 2016. Of the remaining shares, half vest on each of Dec. 31, 2017 and 2018, provided the recipient remains in continuous service with the Company on each such vesting date. ( 3 )Represents an unvested time-based restricted stock award granted on 4/1/2013 under Seacoast's 2000 Long-Term Incentive Plan which shall vest in 25 percent increments beginning on the second anniversary of the date of the grant, and each of three anniversaries thereafter, subject to continued employment. ( 4 )Granted pursuant to the Company's Amended and Restated 2013 Incentive Plan. ( 5 )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. ( 6 )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. ( 7 )Originally had two tiered vesting. Performance criteria was met and time-based vesting began on 7/1/15. 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. ( 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. ( 9 )Vests over 5 years at the rate of 20 percent 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.

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