X0206 3 2017-08-01 0 0001610950 INC Research Holdings, Inc. INCR 0001034196 ADVENT INTERNATIONAL CORP/MA C/O ADVENT INTERNATIONAL CORPORATION 75 STATE STREET BOSTON MA 02109 true 0001665372 Advent International GPE VIII-J Limited Partnership C/O ADVENT INTERNATIONAL CORPORATION 75 STATE STREET BOSTON MA 02109 true 0001664594 Advent International GPE VIII-A Limited Partnership C/O ADVENT INTERNATIONAL CORPORATION 75 STATE STREET BOSTON MA 02109 true 0001664585 Advent International GPE VIII-E Limited Partnership C/O ADVENT INTERNATIONAL CORPORATION 75 STATE STREET BOSTON MA 02109 true 0001664583 Advent International GPE VIII-G Limited Partnership C/O ADVENT INTERNATIONAL CORPORATION 75 STATE STREET BOSTON MA 02109 true 0001665371 Advent International GPE VIII-K Limited Partnership C/O ADVENT INTERNATIONAL CORPORATION 75 STATE STREET BOSTON MA 02109 true 0001665977 Advent International GPE VIII-L Limited Partnership C/O ADVENT INTERNATIONAL CORPORATION 75 STATE STREET BOSTON MA 02109 true Class A Common Stock 22413317 I See Footnotes See Exhibit 99.1 for text of footnote (1) See Exhibit 99.1 for text of footnote (2) See Exhibit 99.1 for text of footnote (3) Exhibit 99.1 and Exhibit 99.2 (Joint Filer Information) are incorporated herein by reference. This Form 3 is the fifth of six Forms 3 being filed relating to the same event. The Form 3 has been split into six 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 Advent International Corporation. Advent International Corporation, Name: /s/ Michael Ristaino, Title: Vice President of Finance - Fund Administration 2017-08-11