Medidata Solutions to Present at the Credit Suisse Healthcare Conference

FOR IMMEDIATE RELEASE

NEW YORK, N.Y. – November 3, 2010 – Medidata Solutions (NASDAQ: MDSO), a leading global provider of SaaS-based clinical development solutions, today announced that Tarek Sherif, chairman and chief executive officer, and Bruce Dalziel, chief financial officer, will present at the Credit Suisse Healthcare Conference at 4:00 p.m. ET (1:00 p.m. PT) on November 11, 2010 in Phoenix, AZ.

A live audio webcast will be available on the “Investor” section of Medidata’s website at http://investor.mdsol.com. Please visit the website at least 15 minutes prior to the event to register, download and install any necessary audio or video software to access the presentation. For those unable to participate in the live webcast, a replay will be archived on the “Investor” section of Medidata’s website at http://investor.mdsol.com for a limited period of time following the conference.

About Medidata Solutions Worldwide
Medidata Solutions (www.mdsol.com) is a leading global provider of SaaS-based clinical development solutions that enhance the efficiency of customers’ clinical trials. For over 10 years, Medidata has consistently brought next-generation innovation to the life science industry to lower the total cost of clinical development through informed trial planning and management, optimized clinical processes and platform interoperability. Medidata’s advanced solutions address key functions throughout the clinical development process including protocol development (Medidata Designer®), trial planning and management (Medidata Grants Manager®, Medidata CRO Contractor®), user and learning management (iMedidata™), randomization and trial supply management (Medidata Balance™), monitoring (Medidata Rave Monitor, Medidata Rave Targeted SDV), Serious Adverse Events capture (Medidata Rave Safety Gateway) and clinical data capture, management and reporting (Medidata Rave®). Our diverse customer base spans biopharmaceutical companies, medical device and diagnostic companies, academic and government institutions, CROs and other research organizations, and includes more than 20 of the top 25 global pharmaceutical companies as well as organizations of all sizes developing life-enhancing medical treatments and diagnostics.

Investor Contact:
Hulus Alpay
Medidata Solutions
212.419.1025
halpay@mdsol.com

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