FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN 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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1. Name and Address of Reporting Person * KKR PRA Investors L.P.   2. Issuer Name and Ticker or Trading Symbol PRA Health Sciences, Inc. [PRAH] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O KOHLBERG KRAVIS ROBERTS & CO. L.P, 9 WEST 57TH STREET, SUITE 4200 3. Date of Earliest Transaction (Month/Day/Year) 08/09/2018 (Street) NEW YORK, NY 10019 4. If Amendment, Date 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 (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 08/09/2018   S   6,500,000 D $ 101.01 (1) 6,695,984 I See Footnotes (2) (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
KKR PRA Investors L.P. C/O KOHLBERG KRAVIS ROBERTS & CO. L.P 9 WEST 57TH STREET, SUITE 4200 NEW YORK, NY 10019
KKR PRA Investors GP II LLC C/O KOHLBERG KRAVIS ROBERTS & CO. L.P. 9 WEST 57TH STREET, SUITE 4200 NEW YORK, NY 10019
KKR PRA Investors GP LLC C/O KOHLBERG KRAVIS ROBERTS & CO. L.P 9 WEST 57TH STREET, SUITE 4200 NEW YORK, NY 10019
KKR North America Fund XI L.P. C/O KOHLBERG KRAVIS ROBERTS & CO. L.P. 9 WEST 57TH STREET, SUITE 4200 NEW YORK, NY 10019
KKR Associates North America XI L.P. C/O KOHLBERG KRAVIS ROBERTS & CO. L.P. 9 WEST 57TH STREET, SUITE 4200 NEW YORK, NY 10019
KKR North America XI Ltd C/O KOHLBERG KRAVIS ROBERTS & CO. L.P. 9 WEST 57TH STREET, SUITE 4200 NEW YORK, NY 10019

Signatures

KKR PRA INVESTORS L.P. By: KKR PRA Investors GP II LLC, its general partner By: /s/ Terence P. Gallagher Name: Terence P. Gallagher Title: Attorney-in-fact for William J. Janetschek, Vice President		08/13/2018
**Signature of Reporting Person		Date
KKR PRA INVESTORS GP II LLC By: /s/ Terence P. Gallagher Name: Terence P. Gallagher Title: Attorney-in-fact for William J. Janetschek, Vice President		08/13/2018
**Signature of Reporting Person		Date
KKR PRA INVESTORS GP LLC By: /s/ Terence P. Gallagher Name: Terence P. Gallagher Title: Attorney-in-fact for William J. Janetschek, Vice President		08/13/2018
**Signature of Reporting Person		Date
KKR NORTH AMERICA FUND XI L.P. By: KKR Associates North America XI L.P., its general partner By: KKR North America XI Ltd, its general partner By: /s/ Terence Gallagher Name: Terence Gallagher Title: Attorney-in-fact for William J. Janetschek, Director		08/13/2018
**Signature of Reporting Person		Date
KKR ASSOCIATES NORTH AMERICA XI L.P. By: KKR North America XI Limited, its general partner By: /s/ Terence P. Gallagher Name: Terence P. Gallagher Title: Attorney-in-fact for William J. Janetschek, Director		08/13/2018
**Signature of Reporting Person		Date
KKR NORTH AMERICA XI LIMITED By: /s/ Terence P. Gallagher Name: Terence P. Gallagher Title: Attorney-in-fact for William J. Janetschek, Director		08/13/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(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)	This amount represents the secondary public offering price per share of common stock of PRA Health Sciences, Inc., less the underwriting discount of $0.49 per share.
(2)	Securities are held by KKR PRA Investors L.P. KKR PRA Investors GP II LLC is the sole general partner of KKR PRA Investors L.P. KKR PRA Investors GP LLC is the sole member of KKR PRA Investors GP II LLC. KKR North America Fund XI L.P. is the sole member of KKR PRA Investors GP LLC. KKR Associates North America XI L.P. is the general partner of KKR North America Fund XI L.P. KKR North America XI Limited is the general partner of KKR Associates North America XI L.P. KKR Fund Holdings L.P. is the sole shareholder of KKR North America XI Limited. KKR Fund Holdings GP Limited is a general partner of KKR Fund Holdings L.P. KKR Group Holdings Corp. is a general partner of KKR Fund Holdings L.P. and the sole shareholder of KKR Fund Holdings GP Limited. KKR & Co. Inc. is the sole shareholder of KKR Group Holdings Corp. KKR Management LLC is the controlling shareholder of KKR & Co. Inc. Messrs. Henry R. Kravis and George R. Roberts are the designated members of KKR Management LLC.
(3)	Each of the Reporting Persons (other than KKR PRA Investors L.P.), disclaims beneficial ownership of the securities reported herein except to the extent of such Reporting Person's pecuniary interest therein, and, pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, each of the Reporting Persons (other than KKR PRA Investors L.P.) states that the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose.
Remarks: Because no more than 10 reporting persons can file any one Form 4 through the Securities and Exchange Commission's EDGAR system, KKR Fund Holdings L.P., KKR Fund Holdings GP Limited, KKR Group Holdings Corp., KKR & Co. Inc., KKR Management LLC and Messrs. Henry R. Kravis and George R. Roberts have filed a separate Form 4.

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

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