Medidata Solutions Announces Fourth Quarter and Full Year Earnings Conference Call Date and Automatic Extension of Lock-Up Period

FOR IMMEDIATE RELEASE
 
Medidata Solutions Announces Fourth Quarter and Full Year Earnings
Conference Call Date and Automatic Extension of Lock-Up Period

NEW YORK, N.Y. – February 16, 2010 – Medidata Solutions (NASDAQ: MDSO), a leading global provider of hosted clinical development solutions, today announced that it will release its fourth quarter and full year 2009 financial results for the period ending December 31, 2009 following the close of the market on Thursday, March 4, 2010.

Fourth Quarter and Full Year Earnings Conference Call Details

Tarek Sherif, chief executive officer, and Bruce Dalziel, chief financial officer, will hold a conference call at 5:00 p.m. ET for investors and analysts to review these results and discuss the outlook for the first quarter and full year 2010.

To participate by telephone, domestic participants may dial 877-303-2528 and international participants may dial 847-829-0023. Those interested in participating in the conference call should dial in at least 10 minutes prior to the call to register.

Participants can also join the call via a simultaneous live audio webcast, which will be made available on the “Investor” section of Medidata’s Web site, http://investor.mdsol.com.

A replay of the conference call can be accessed until Thursday, March 18, 2010 by dialing 800-642-1687 domestically or 706-645-9291 internationally, with the passcode 56767569. An archive of the call will also be hosted on the “Investor” section of Medidata’s Web site, http://investor.mdsol.com, for a limited period of time.

Automatic Extension of Lock-Up Period

Medidata also announced that the lock-up agreements entered into with its underwriters in conjunction with its secondary public offering will automatically be extended 18 days beyond the Company's March 4, 2010 earnings release. The lock-up period was originally due to expire on March 8th, however the Company's underwriting agreement provided for an automatic extension, depending on the timing of Medidata’s quarterly earnings press release. Therefore, the first sales of shares restricted by the underwriter's lock-up may now take place on Monday, March 22, 2010.

About Medidata Solutions Worldwide
Medidata Solutions (www.mdsol.com) is a leading global provider of hosted clinical development solutions that enhance the efficiency of customers’ clinical development processes and optimize their research and development investments. Medidata products and services allow customers to achieve clinical results more efficiently and effectively by streamlining the design, planning and management of key aspects of the clinical development process, including protocol development (Medidata Designer®), investigator benchmarking and budgeting (Medidata Grants Manager™), contract research organization (CRO) benchmarking and budgeting (Medidata CRO Contractor™), and the capture, management, analysis and reporting of clinical trial data (Medidata Rave®). Medidata’s diverse customer base spans pharmaceutical, biotechnology and medical device companies, academic institutions, CROs and other research organizations, and includes more than 20 of the top 25 global pharmaceutical companies.

Contact:
Susan McCarron
Lois Paul & Partners
781.782.5767
Susan_McCarron@lpp.com