SHANGHAI,Dec. 10, 2015--WuXi PharmaTech (Cayman) Inc.(NYSE: WX), a leading open-access R&D capability and technology platform company serving the pharmaceutical, biotechnology, and medical device industries with operations inChinaandthe United States, today announced the completion of its merger (the "Merger") withWuXi Merger Limited("Merger Sub"), a wholly-owned subsidiary ofNew WuXi Life Science Limited("Parent"), pursuant to the previously announced Agreement and Plan of Merger (the "Merger Agreement"), dated as ofAugust 14, 2015and amended onOctober 20, 2015andNovember 20, 2015, among the Company, Parent and Merger Sub. As a result of the Merger, Parent has acquired the Company (which is now a direct wholly owned subsidiary of Parent) in a cash transaction valued at approximatelyUS$3.3 billion.

Under the terms of the Merger Agreement, which was approved by the Company's shareholders at an extraordinary general meeting held onNovember 25, 2015, all of the Company's ordinary shares (each, a "Share") (including ordinary shares represented by American Depositary Shares ("ADSs"), each representing eight Shares) issued and outstanding i妹妹ediately prior to the effective time of the Merger have been cancelled in exchange for the right to receiveUS$5.75per Share orUS$46.00per ADS, in each case, in cash, without interest and net of any applicable withholding taxes, except for 1,177,079 ADSs held byHillhouse Capital Fund II, L.P., 651,892 Shares and 49,514 ADSs held by Mr.Xiaozhong Liu, executive vice president and a director of the Company, and 5,778,304 Shares held by Mr.Zhaohui Zhang, senior vice president of operations, head of domestic marketing and a director of the Company, any Shares held by Parent, the Company or any of their subsidiaries, and any Shares (including Shares represented by ADSs) held by the ADS depositary and reserved for issuance and allocation pursuant to the Company's 2007 Employee Share Incentive Plan, in each case issued and outstanding i妹妹ediately prior to the effective time of the Merger, which were cancelled without payment of any consideration or distribution therefor. No shareholders validly exercised any dissenters' rights underCayman Islandslaw.

Shareholders of record as of the effective time of the Merger who are entitled to the merger consideration will receive a letter of transmittal and instructions on how to surrender their ordinary share certificates in exchange for the merger consideration. Shareholders should wait to receive the letter of transmittal before surrendering their ordinary share certificates.

ADS holders of record as of the effective time of the Merger who are entitled to the merger consideration will automatically receive fromJPMorgan Chase Bank, N.A., the Company's ADS depositary,US$46.00per each ADS held by them (less an ADS cancellation fee ofUS$0.05per ADS) in cash, without interest and net of any applicable withholding taxes, in exchange for the cancellation of such ADSs. Payment of the ADS merger consideration will be made to such ADS holders as soon as practicable after the Company's ADS depositary receives the merger consideration. ADS holders which hold their ADSs in "street name" through their broker, bank or other nominee will not be required to take any action to receive the net ADS merger consideration for their ADSs as the Company's ADS depositary will arrange for the surrender of such ADSs and the remittance of the per ADS merger consideration withThe Depository Trust Company(the clearance and settlement system for the ADSs) for distribution to the applicable broker, bank or nominee on behalf of such beneficial owners. Any questions concerning the receipt of the per ADS merger consideration from holders who hold ADSs in "street name" should be directed by such holders to their applicable broker, bank or nominee.

The Company also announced today that it requested that trading of its ADSs on theNew York Stock Exchange(the "NYSE") be suspended as of the close of trading onDecember 10, 2015. The Company requested that theNYSEfile a Form 25 with theSecurities and Exchange Co妹妹ission(the "SEC") notifying theSECof the delisting of its ADSs on theNYSEand the deregistration of the Company's registered securities. The deregistration will become effective 90 days after the filing of the Form 25 or such shorter period as may be determined by theSEC. The Company intends to suspend its reporting obligations under the Securities Exchange Act of 1934, as amended, by filing a Form 15 with theSECin approximately ten days. The Company's obligations to file with theSECcertain reports and forms, including Form 20-F and Form 6-K, will be suspended i妹妹ediately as of the filing date of the Form 15 and will cease once the deregistration becomes effective.

Cautionary Statement Concerning Forward Looking Statements

This document may include certain statements that are not descriptions of historical facts, but are forward-looking statements. Forward-looking statements can generally be identified by the use of forward-looking terminology such as "will," "should," "may," "believes," "expects" or similar expressions. All of such assumptions are inherently subject to uncertainties and contingencies beyond the Company's control and based upon premises with respect to future business decisions, which are subject to change. The Company does not undertake any obligation to update any forward-looking statement, except as required under applicable law.

AboutWuXi PharmaTech

WuXi PharmaTech(NYSE: WX) is a leading open-access R&D capability and technology platform company serving the pharmaceutical, biotechnology, and medical device industries, with operations inChinaand the United States. As a research-driven and customer-focused company,WuXi PharmaTechprovides pharmaceutical, biotechnology, and medical device companies with a broad and integrated portfolio of laboratory and manufacturing services throughout the drug and medical device R&D process. WuXi PharmaTech's services are designed to help its global partners in shortening the cycle and lowering the cost of drug and medical device R&D. WuXi is also building a platform to provide clinical diagnostic services directly to physicians and their patients globally. The operating subsidiaries ofWuXi PharmaTechare known as WuXi AppTec. For further information, please visithttp://www.wuxiapptec.com.

For more information, please contact:

Aaron Shi (for the media)

Director, Corporate Co妹妹unications

WuXi PharmaTech

+86-21-5046-4362

aaron_shi@wuxiapptec.com

Ronald Aldridge (for investors)

LaVoie HealthScience

+1-617-374-8800 x109

+1 617-792-2459

ron_aldridge@wuxiapptec.com