Medidata Solutions to Host Analyst Event at DIA Conference

FOR IMMEDIATE RELEASE

NEW YORK, N.Y. – June 7, 2011 – Medidata Solutions (NASDAQ: MDSO), a leading global provider of SaaS-based clinical development solutions, today announced that it will host an analyst event starting at 9:00 a.m. ET on Tuesday, June 21, 2011 in Chicago, IL. The invitation-only event is expected to last approximately two hours and will be held in conjunction with the Drug Information Association (DIA) Annual Meeting. The management team will discuss Medidata’s product vision and long-term growth strategy, provide product demos and host a question and answer session.

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 (Medidata Designer®), trial planning and budgeting (Medidata Grants Manager®, Medidata CRO Contractor®), site negotiation (Medidata Grants Manager Contracting™), clinical portal (iMedidata™), randomization and trial supply management (Medidata Balance™), monitoring (Medidata Rave Monitor, Medidata Rave Targeted SDV), safety events capture (Medidata Rave Safety Gateway), clinical data capture and management (Medidata Rave®) to business analytics (Medidata Insights™). 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