Exhibit 99.1

Joint Filer Information

Name of Joint Filer:	THL Managers VI, LLC
Address of Joint Filer:	c/o Thomas H. Lee Partners, L.P.
	100 Federal Street, 35th Floor
	Boston, MA 02110
Relationship of Joint Filer to Issuer:	Director; 10% Owner
Issuer Name and Ticker or Trading Symbol:	Syneos Health, Inc. [SYNH]
Date of Event Requiring
Statement (Month/Day/Year):	September 13, 2018
Designated Filer:	Thomas H. Lee Advisors, LLC

Signature:

THL MANAGERS VI, LLC

By:

/s/ Charles P. Holden

Name: Charles P. Holden

Title: Managing Director

September 24, 2018

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Exhibit 99.1

Joint Filer Information

Name of Joint Filer:	THL Managers VII, LLC
Address of Joint Filer:	c/o Thomas H. Lee Partners, L.P.
	100 Federal Street, 35th Floor
	Boston, MA 02110
Relationship of Joint Filer to Issuer:	Director; 10% Owner
Issuer Name and Ticker or Trading Symbol:	Syneos Health, Inc. [SYNH]
Date of Event Requiring
Statement (Month/Day/Year):	September 13, 2018
Designated Filer:	Thomas H. Lee Advisors, LLC

Signature:

THL MANAGERS VII, LLC

By:

/s/ Charles P. Holden

Name: Charles P. Holden

Title: Managing Director

September 24, 2018

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