Sec Form 4 Filing - ABBRECHT TODD M @ Syneos Health, Inc. - 2018-09-13

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 ABBRECHT TODD M 2. Issuer Name and Ticker or Trading Symbol Syneos Health, Inc. [ SYNH] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O THOMAS H. LEE PARTNERS, L.P., 100 FEDERAL STREET, 35TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 09/13/2018 (Street) BOSTON, MA02110 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 Class A Common Stock 09/13/2018 J( 1 ) 2,178 ( 1 ) D $ 0 4,103 ( 2 ) 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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other ABBRECHT TODD M C/O THOMAS H. LEE PARTNERS, L.P. 100 FEDERAL STREET, 35TH FLOOR BOSTON, MA02110 X Signatures /s/ Todd M. Abbrecht 09/17/2018 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents shares of the Issuer held by the Reporting Person directly, of which 1,574 are being transferred to THL Managers VI, L.P. ("Managers VI") and 604 are being transferred to THL Managers VII, L.P. ("Managers VII"), in each case, for no consideration. The shares were originally granted to the Reporting Person in connection with the Reporting Person's service as a director of the Issuer. Pursuant to operative agreements of Thomas H. Lee Equity Fund VI, L.P., Thomas H. Lee Equity Fund VII, L.P. and Thomas H. Lee Partners, L.P. ("THL Partners"), these shares were required to be transferred to Managers VI and Managers VII following the lapse of restrictions. ( 2 )The Reporting Person is a Managing Director of THL Partners, which is the managing member of Managers VI and Managers VII. Therefore, the Reporting Person may be deemed to beneficially own the shares of the Issuer owned directly by each of Managers VI and Managers VII. The Reporting Person disclaims beneficial ownership of all shares of the Issuer owned by Managers VI and Managers VII, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such shares for the purposes of Section 16 or for any other purpose, except to the extent of the Reporting Person's pecuniary interest therein.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* 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).

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