Ownership Submission
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, 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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(Print or Type Responses)
1. Name and Address of Reporting Person *
  THOMAS H. LEE ADVISORS, LLC
 2. Date of Event Requiring Statement (Month/Day/Year)
08/01/2017		 3. Issuer Name and Ticker or Trading Symbol
INC Research Holdings, Inc. [INCR]
(Last)
(First)
(Middle)
C/O THOMAS H. LEE PARTNERS, L.P., 100 FEDERAL STREET, 35TH FLOOR		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

BOSTON, MA 02110		 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
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 25,239,664
I
See footnotes (1) (2) (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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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 of Derivative Security: 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

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
THOMAS H. LEE ADVISORS, LLC
C/O THOMAS H. LEE PARTNERS, L.P.
100 FEDERAL STREET, 35TH FLOOR
BOSTON, MA 02110		        
THL Fund VII Coinvestment Partners, L.P.
C/O THOMAS H. LEE PARTNERS, L.P.
100 FEDERAL STREET, 35TH FLOOR
BOSTON, MA 02110		        
THL Coinvestment Partners, L.P.
C/O THOMAS H. LEE PARTNERS, L.P.
100 FEDERAL STREET, 35TH FLOOR
BOSTON, MA 02110		        
THL Operating Partners, L.P.
C/O THOMAS H. LEE PARTNERS, L.P.
100 FEDERAL STREET, 35TH FLOOR
BOSTON, MA 02110		        
Great-West Investors LP
C/O THOMAS H. LEE PARTNERS, L.P.
100 FEDERAL STREET, 35TH FLOOR
BOSTON, MA 02110		        
Putnam Investments Employees' Securities Co III LLC
C/O THOMAS H. LEE PARTNERS, L.P.
100 FEDERAL STREET, 35TH FLOOR
BOSTON, MA 02110		        
ABBRECHT TODD M
C/O THOMAS H. LEE PARTNERS, L.P.
100 FEDERAL STREET, 35TH FLOOR
BOSTON, MA 02110		        
Nelson Joshua M
C/O THOMAS H. LEE PARTNERS, L.P.
100 FEDERAL STREET, 35TH FLOOR
BOSTON, MA 02110		        

Signatures

Thomas H. Lee Advisors, LLC By: THL Holdco, LLC, its Managing Member By: /s/ Charles P. Holden Title: Managing Director 08/10/2017
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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).
(1) See Exhibit 99.1 for text of footnote (1).
(2) See Exhibit 99.1 for text of footnote (2).
(3) See Exhibit 99.1 for text of footnote (3).
 
Remarks:
Exhibit 99.1 and Exhibit 99.2 (Joint Filer Information) are incorporated herein by reference. This Form 3 is the second of two Forms 3 being filed relating to the same event. The Form 3 has been split into two filings because there are more than 10 Reporting Persons in total, and the SEC's EDGAR filing system limits a single Form 3 to a maximum of 10 Reporting Persons. Each Form 3 will be filed by Designated Filer Thomas H. Lee Advisors, LLC.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.