Exhibit 99.1

FOR IMMEDIATE RELEASE

PRA Health Sciences, Inc. Reports First Quarter 2017 Results

RALEIGH, N.C., April 25, 2017 -- PRA Health Sciences, Inc. (“PRA” or the “Company”) (NASDAQ: PRAH) today reported financial results for the quarter ended March 31, 2017.

For the three months ended March 31, 2017, service revenue was $427.1 million, which represents growth of 14.7%, or $54.8 million, compared to the first quarter of 2016 at actual foreign exchange rates. On a constant currency basis, service revenue grew $56.2 million, an increase of 15.1% compared to the first quarter of 2016.

Net new business for the quarter ended March 31, 2017 was $564.8 million, representing a net book-to-bill ratio of 1.32 for the period. This net new business contributed to an ending backlog of $3.1 billion at March 31, 2017.

“2017 is off to a solid start, and I am pleased with our first quarter financial results, which demonstrate a continuation of our momentum from 2016,” said Colin Shannon, PRA’s Chief Executive Officer. “We continue to execute consistently across our business, as evidenced by our double-digit revenue growth and a very strong book-to-bill ratio. We continue to stay focused on our key strategic objectives and our client deliverables, and we look forward to continuing to deliver strong results for the remainder of 2017.”

Direct costs were $287.5 million during the three months ended March 31, 2017 compared to $243.5 million for the first quarter of 2016. Direct costs were 67.3% of service revenue during the first

quarter of 2017 compared to 65.4% of service revenue during the first quarter of 2016. The increase in direct costs as a percentage of service revenue is due to an increase in salaries and related benefits as we continue to hire billable staff to support our current projects and hire additional staff to ensure appropriate staffing levels for our future growth.

Selling, general and administrative expenses were $74.3 million during the three months ended March 31, 2017 compared to $64.0 million for the first quarter of 2016. Selling, general and administrative costs were 17.4% of service revenue during the first quarter of 2017 compared to 17.2% of service revenue during the first quarter of 2016. The slight increase in selling, general and administrative expenses as a percentage of revenue is primarily attributable to increased facility costs as the Company continues to grow.

For the three months ended March 31, 2016, we incurred transaction-related expenses of $28.9 million. The costs consist of $26.8 million of stock-based compensation expense related to the release of transfer restrictions on vested options and the vesting of certain performance-based stock options in connection with the March 2016 secondary offering. In addition, we incurred $2.1 million of third-party fees associated with the secondary offering and the closing of our accounts receivable financing agreement. There were no transaction-related expenses during the three months ended March 31, 2017.

For the three months ended March 31, 2016, we also incurred a loss on extinguishment of debt of $21.5 million. This loss is associated with our cash tender offer on our 9.5% senior notes due 2023, which included $17.4 million of early tender premium, the write-off of $3.7 million of unamortized debt issuance costs and $0.4 million of other costs associated with the transaction. There was no loss of extinguishment of debt during the three months ended March 31, 2017.

GAAP net income was $25.2 million for the three months ended March 31, 2017, or $0.39 per share on a diluted basis, compared to GAAP net loss of $16.0 million for the three months ended March 31, 2016, or $0.27 per share on a diluted basis. Our GAAP net loss for the three months ended March 31, 2016 included transaction-related expenses and the loss on extinguishment of debt discussed above.

EBITDA was $57.8 million for the three months ended March 31, 2017, representing an increase of 421.6% compared to the first quarter of 2016. Adjusted EBITDA was $69.3 million for the three months ended March 31, 2017, representing growth of 2.9% compared to the first quarter of 2016.

Adjusted Net Income was $40.4 million for the three months ended March 31, 2017, representing 15.9% growth compared to the first quarter of 2016. Adjusted Net Income per diluted share was $0.62 for the three months ended March 31, 2017, representing 12.7% growth compared to the first quarter of 2016.

A reconciliation of our non-GAAP measures, including EBITDA, Adjusted EBITDA, Adjusted Net Income, Adjusted Net Income per share and our 2017 guidance, to the corresponding GAAP measures is included in this press release.

Guidance

The Company is reaffirming its full year 2017 service revenue guidance of between $1.795 billion and $1.835 billion, representing constant currency growth of 14% to 16%, GAAP net income per diluted share between $2.46 and $2.56, Adjusted Net Income per diluted share between $3.08 and $3.18, and an annual effective income tax rate estimated at approximately 27%. All financial guidance assumes a EURO rate of 1.11 and a GBP rate of 1.35. All other foreign currency exchange rates are as of January 31, 2017.

Conference Call Details

PRA will host a conference call at 9:00 a.m. ET on April 26, 2017, to discuss the contents of this release and other relevant topics. To participate, please dial (877) 930-8062 within the United States or (253) 336-7647 outside the United States approximately 10 minutes before the scheduled start of the call. The conference ID for the call is 10245299. The conference call will also be accessible, live via audio broadcast, on the Investor Relations section of the PRA website at investors.prahs.com. A replay of the conference call will be available online at investors.prahs.com. In addition, an audio replay of the call will be available for one week following the call and can be accessed by dialing (855) 859-2056 within the United States or (404) 537-3406 outside the United States. The replay ID is 10245299.

Additional Information

A  financial supplement of first quarter 2017 results, which should be read in conjunction with this press release, may be found on the home page of the Investors portion of the Company’s website in a document titled “Q1 2017 Earnings.”

About PRA Health Sciences

PRA (NASDAQ: PRAH) is one of the world’s leading global contract research organizations, or CROs, by revenue, providing outsourced clinical development services to the biotechnology and pharmaceutical industries. PRA’s global clinical development platform includes more than 70 offices across North America, Europe, Asia, Latin America, South Africa, Australia and the Middle East and over 13,300 employees worldwide. Since 2000, PRA has performed approximately 3,500 clinical trials worldwide. In addition, PRA has participated in the pivotal or supportive trials that led to U.S. Food and Drug Administration or international regulatory approval of more than 70 drugs.

PRA has therapeutic expertise in areas that are among the largest in pharmaceutical development, including oncology, central nervous system, inflammation and infectious diseases. PRA believes that it provides its clients with one of the most flexible clinical development service offerings, which includes both traditional, project-based Phase I through Phase IV services, as well as embedded and functional outsourcing services. The Company has invested in medical informatics and clinical technologies designed to enhance efficiencies, improve study predictability and provide better transparency to clients throughout their clinical development processes. To learn more about PRA, please visit www.prahs.com.

Internet Posting of Information: The Company routinely posts information that may be important to investors in the ‘Investor Relations’ section of the Company’s website at www.prahs.com. The

Company encourages investors and potential investors to consult the Company’s website regularly for important information about the Company.

Contacts: 

Helen O’Donnell

Solebury Communications Group

Managing Director

203.428.3213

InvestorRelations@PRAHS.com or

hodonnell@soleburyir.com 

Christine Rogers

PRA Health Sciences, Inc.

Director, Public Relations

919.786.8463

rogerschristine@prahs.com 

Forward-Looking Statements

This press release contains forward-looking statements that reflect, among other things, the Company’s current expectations and anticipated results of operations, all of which are subject to known and unknown risks, uncertainties and other factors that may cause actual results, performance or achievements, market trends or industry results to differ materially from those expressed or implied by such forward-looking statements. For this purpose, any statements contained herein that are not statements of historical fact may constitute forward-looking statements. Without limiting the foregoing, words such as “anticipates,” “believes,” “estimates,” “expects,” “guidance,” “intends,” “may,” “plans,” “projects,” “should,” “targets,” “will” and the negative thereof and similar words and expressions are intended to identify forward-looking statements. Actual results may differ materially from the Company’s expectations due to a number of factors, including that most of the Company’s contracts may be terminated on short notice and that the Company may be unable to maintain large customer contracts or to enter into new contracts; the historical indications of the relationship of backlog to revenues may not be indicative of their future relationship; the market for the Company’s services may not grow as the Company expects; the Company may under price contracts or overrun its cost estimates, and if the Company is unable to achieve operating efficiencies or grow revenues faster than expenses, operating margins will be adversely affected; the Company may be unable to maintain information systems or effectively update them; customer or therapeutic concentration could harm the Company’s business; the Company’s business is subject to risks associated with international operations, including economic, political and other risks; the Company is also subject to a number of additional risks associated with its business outside the United States, including foreign currency exchange fluctuations and restrictive regulations, as well as the risks and uncertainties associated with the United Kingdom’s expected withdrawal from the European Union; government regulators or customers may limit the scope of prescription or withdraw products from the market, and government regulators may impose new regulations affecting the Company’s business; the Company may be unable to successfully develop and market new services or enter new markets; the Company’s failure to perform services in accordance with contractual requirements, regulatory standards and ethical considerations may subject it to significant costs or liability, damage its reputation and cause it to lose existing business or not

receive new business; the Company’s services are related to treatment of human patients, and it could face liability if a patient is harmed; the Company has substantial indebtedness and may incur additional indebtedness in the future, which could adversely affect the Company’s financial condition; and other factors that are set forth in the Company’s filings with the Securities and Exchange Commission, including our most recent Annual Report on Form 10-K filed with the SEC on February 23, 2017. The Company undertakes no obligation to update any forward-looking statement after the date of this release, whether as a result of new information, future developments or otherwise, except as may be required by applicable law.

Use of Non-GAAP Financial Measures

This press release includes EBITDA, Adjusted EBITDA, Adjusted Net Income and Adjusted Net Income per share, each of which are financial measures not prepared in accordance with accounting principles generally accepted in the United States (“GAAP”). Management believes that these measures provide useful supplemental information to management and investors regarding our operating results as they exclude certain items whose fluctuation from period- to- period do not necessarily correspond to changes in the operating results of our business. As a result, management and our board of directors regularly use EBITDA and Adjusted EBITDA as a tool in evaluating our operating and financial performance and in establishing discretionary annual bonuses. Adjusted EBITDA is also the basis for covenant compliance EBITDA, which is used in certain covenants in the credit agreement governing our senior secured credit facilities and the indenture governing the senior notes. In addition, management believes that EBITDA, Adjusted EBITDA and Adjusted Net Income (including diluted adjusted net income per share) facilitate comparisons of our operating results with those of other companies by backing out of GAAP net income items relating to variations in capital structures (affecting interest expense), taxation, and the age and book depreciation of facilities and equipment (affecting relative depreciation expense), which may vary for different companies for reasons unrelated to operating performance. We believe that EBITDA, Adjusted EBITDA and Adjusted Net Income (including diluted adjusted net income per share) are frequently used by securities analysts, investors, and other interested parties in the evaluation of issuers, many of which also present EBITDA, Adjusted EBITDA and Adjusted Net Income (including diluted adjusted net income per share) when reporting their results in an effort to facilitate an understanding of their operating results.

These non-GAAP financial measures have limitations as analytical tools, and you should not consider these measures in isolation, or as a substitute for analysis of our results as reported under GAAP. Additionally, because not all companies use identical calculations, these presentations of EBITDA, Adjusted EBITDA and Adjusted Net Income (including diluted adjusted net income per share) may not be comparable to similarly titled measures of other companies.

EBITDA represents net income before interest, taxes, depreciation and amortization. Adjusted EBITDA and Adjusted Net Income (including diluted adjusted net income per share) represent EBITDA and net income (including diluted net income per share), respectively, adjusted to exclude  stock-based compensation expense, loss (gain) on disposal of fixed assets, loss on modification or extinguishment of debt, foreign currency losses (gains), other non-operating expense (income), equity in (gains) losses of unconsolidated joint ventures, transaction-related cost, acquisition-related costs, severance costs and restructuring charges, prior year foreign research and development credits, lease termination costs, non-cash rent adjustment and other charges. Adjusted Net Income is also adjusted to exclude amortization of intangible assets, amortization of terminated interest rate swaps, 

and amortization of deferred financing costs. EBITDA, Adjusted EBITDA and Adjusted Net Income are not measurements of our financial performance under GAAP and should not be considered as alternatives to net income or other performance measures derived in accordance with GAAP or as alternatives to cash flow from operating activities as measures of our liquidity. EBITDA, Adjusted EBITDA and Adjusted Net Income have limitations as analytical tools, and you should not consider such measures either in isolation or as substitutes for analyzing our results as reported under GAAP.

Some of these limitations are:

Because of these limitations, EBITDA and Adjusted EBITDA should not be considered as discretionary cash available to us to reinvest in the growth of our business or as a measure of cash that will be available to us to meet our obligations.

Constant Currency

Constant currency comparisons are based on translating local currency amounts in the current year period at actual foreign exchange rates for the prior year. The Company routinely evaluates its financial performance on a constant currency basis in order to facilitate period- to- period comparisons without regard to the impact of changing foreign currency exchange rates.

PRA HEALTH SCIENCES, INC. AND SUBSIDIARIES

CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS

 (in thousands, except per share amounts)

(unaudited)

PRA HEALTH SCIENCES, INC. AND SUBSIDIARIES

CONSOLIDATED CONDENSED BALANCE SHEETS

(in thousands, except share amounts)

(unaudited)

PRA HEALTH SCIENCES, INC. AND SUBSIDIARIES

CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS

(in thousands)

(unaudited)

PRA HEALTH SCIENCES, INC. AND SUBSIDIARIES

RECONCILIATION OF NON-GAAP MEASURES

(in thousands, except per share amounts)

(unaudited)

PRA HEALTH SCIENCES, INC. AND SUBSIDIARIES

RECONCILIATION OF GAAP TO NON-GAAP GUIDANCE

(in millions, except per share amounts)

(unaudited)

###