As Of	Filer	Filing¹	For·On·As	Docs:Size	Issuer		Filing Agent

  6/9/21  Thomas H. Lee Advisors, LLC       4          Director²   3:101K Syneos Health, Inc.               Broadridge Fin’l So… Inc 
          THL Equity Fund VII Investors (inVentiv), L.P.
          THL Executive Fund VII, L.P.
          THL Fund VII Coinvestment Partners, L.P.
 5/20/21  Thomas H. Lee Advisors, LLC       4/A        Director²   3:111K Syneos Health, Inc.               Broadridge Fin’l So… Inc 
          THL Equity Fund VII Investors (inVentiv), L.P.
          THL Executive Fund VII, L.P.
          THL Fund VII Coinvestment Partners, L.P.
 5/18/21  Thomas H. Lee Advisors, LLC       4          Director²   3:77K  Syneos Health, Inc.               Broadridge Fin’l So… Inc 
          THL Equity Fund VII Investors (inVentiv), L.P.
          THL Executive Fund VII, L.P.
          THL Fund VII Coinvestment Partners, L.P.
 5/14/21  Abbrecht Todd M                   4          Director²   3:108K Syneos Health, Inc.               Broadridge Fin’l So… Inc 
          Nelson Joshua M
          THL Equity Fund VII Investors (inVentiv), L.P.
          THL Executive Fund VII, L.P.
          THL Fund VII Coinvestment Partners, L.P.
          Thomas H. Lee Advisors, LLC
 5/10/21  Thomas H. Lee Advisors, LLC       4          Director²   3:95K  Syneos Health, Inc.               Broadridge Fin’l So… Inc 
          THL Equity Fund VII Investors (inVentiv), L.P.
          THL Executive Fund VII, L.P.
          THL Fund VII Coinvestment Partners, L.P.
  3/5/21  Thomas H. Lee Advisors, LLC       4          Dir.,%Own.² 3:100K Syneos Health, Inc.               Broadridge Fin’l So… Inc 
          THL Equity Fund VII Investors (inVentiv), L.P.
          THL Executive Fund VII, L.P.
          THL Fund VII Coinvestment Partners, L.P.
 12/7/20  THL Equity Fd VII Investors …  LP 4          Dir.,%Own.² 3:98K  Syneos Health, Inc.               Broadridge Fin’l So… Inc 
          Abbrecht Todd M
          Nelson Joshua M
          THL Executive Fund VII, L.P.
          THL Fund VII Coinvestment Partners, L.P.
          Thomas H. Lee Advisors, LLC
 9/21/20  Thomas H. Lee Advisors, LLC       4          Dir.,%Own.² 3:105K Syneos Health, Inc.               Broadridge Fin’l So… Inc 
          Abbrecht Todd M
          Nelson Joshua M
          THL Equity Fund VII Investors (inVentiv), L.P.
          THL Executive Fund VII, L.P.
          THL Fund VII Coinvestment Partners, L.P.
 5/29/20  Nelson Joshua M                   4          Dir.,%Own.² 3:84K  Syneos Health, Inc.               Broadridge Fin’l So… Inc 
          Abbrecht Todd M
          THL Equity Fund VII Investors (inVentiv), L.P.
          THL Executive Fund VII, L.P.
          THL Fund VII Coinvestment Partners, L.P.
          Thomas H. Lee Advisors, LLC

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¹	Filing/Form Type:
	4	Statement of Changes in Beneficial Ownership of Securities by an Insider — Form 4 { The Filer is an Insider² of the Issuer }.
	/A	Amendment to, or Amended version of, a previous Filing of this Type.
²	Insider:  The Filer is a Director, Officer, 10% Owner and/or Other “insider” of the Issuer.