Medidata Solutions to Present at the Citi Small and Mid Cap Conference

FOR IMMEDIATE RELEASE

Medidata Solutions to Present at the
Citi Small and Mid Cap Conference

NEW YORK, N.Y. – November 7, 2011 – 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 Cory Douglas, chief financial officer, will present at the Citi Small and Mid Cap Conference at 2:35 p.m. EST (11:35 a.m. PST) on November 16, 2011 in Las Vegas, NV.

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 is a leading global provider of SaaS clinical development solutions that enhance the efficiency of customers’ clinical trials. Medidata’s advanced solutions lower the total cost of clinical development by optimizing clinical trials from concept to conclusion: from study and protocol design, trial planning and budgeting, site negotiation, clinical portal, trial management, randomization and trial supply management, clinical data capture and management, safety events capture, medical coding to business analytics. Our diverse life science 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