SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* THL Equity Advisors VI (2019), LLC (Last) (First) (Middle) C/O THOMAS H. LEE PARTNERS, L.P. 100 FEDERAL STREET, 35TH FLOOR (Street) BOSTON MA 02110 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 04/30/2019	3. Issuer Name and Ticker or Trading Symbol Syneos Health, Inc. [ SYNH ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director X 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Class A Common Stock	5,504,340(2)	I	See footnotes(1)(3)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person* THL Equity Advisors VI (2019), LLC (Last) (First) (Middle) C/O THOMAS H. LEE PARTNERS, L.P. 100 FEDERAL STREET, 35TH FLOOR (Street) BOSTON MA 02110 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer X Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* Thomas H. Lee Equity Fund VI (2019), L.P. (Last) (First) (Middle) C/O THOMAS H. LEE PARTNERS, L.P. 100 FEDERAL STREET, 35TH FLOOR (Street) BOSTON MA 02110 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer X Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* THL Fund VI (2019) Coinvestment Partners, L.P. (Last) (First) (Middle) C/O THOMAS H. LEE PARTNERS, L.P. 100 FEDERAL STREET, 35TH FLOOR (Street) BOSTON MA 02110 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer X Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. This statement is being filed by the following Reporting Persons: Thomas H. Lee Equity Fund VI (2019), L.P. ("Fund VI 2019 LP"); THL Equity Advisors VI (2019), LLC ("Fund VI 2019 GP"); and THL Fund VI (2019) Coinvestment Partners, L.P. ("Fund VI 2019 Coinvest"). Each of the Reporting Persons disclaims beneficial ownership of all shares of the Issuer for the purposes of Section 16 or for any other purpose, except to the extent of such Reporting Person's pecuniary interest therein.

2. Represents 5,352,591 shares of the Issuer directly owned by Fund VI 2019 LP and 151,749 shares of the Issuer directly owned by Fund VI 2019 Coinvest.

3. THL Holdco, LLC is the managing member of Thomas H. Lee Advisors, LLC, which in turn is the general partner of Thomas H. Lee Partners, L.P., which in turn is the sole member of Fund VI 2019 GP and general partner of THL 2019 Coinvest. Fund VI 2019 GP is the general partner of Fund VI 2019 LP.

Remarks:

Exhibit 99.1 (Joint Filer Information) is incorporated herein by reference. This Form 4 is filed by Designated Filer THL Equity Advisors VI (2019), LLC.

	THL Equity Advisors VI (2019), LLC By: Thomas H. Lee Partners, L.P., its sole member By: Thomas H. Lee Advisors, LLC, its general partner By: THL Holdco, LLC, its managing member /s/ Charles P. Holden Name: Charles P. Holden Title: Managing Director	06/26/2019
	** Signature of Reporting Person	Date
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