Medidata Solutions Schedules Second Quarter Earnings Conference Call for August 13, 2009

NEW YORK--(Business Wire)--
Medidata Solutions (Nasdaq: MDSO), a leading global provider of hosted clinical
development solutions, today announced that it will release its second quarter
2009 financial results following the close of the market on Thursday, August 13,
2009. Tarek Sherif, chief executive officer, and Bruce Dalziel, chief financial
officer, will also hold a conference call at 5:00 p.m. ET for investors and
analysts to review these results and discuss the outlook for the third quarter
and full year 2009.

To participate by telephone, domestic participants may dial 877-874-1570 and
international participants may dial 719-325-4933. 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, August 27, 2009
by dialing 888-203-1112 domestically or 719-457-0820 internationally, with the
passcode 6046830. 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.

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.

Medidata Solutions
Hulus Alpay, 212-419-1025
halpay@mdsol.com
or
Lois Paul & Partners
Susan McCarron, 781-782-5767
susan_mccarron@lpp.com

Copyright Business Wire 2009