Medidata Solutions (NASDAQ: MDSO), a leading global provider of cloud-based clinical development solutions, today announced that it will now release its third quarter 2012 financial results before the open of the market on Wednesday, October 31, 2012. The earnings release issuance and conference call was previously scheduled for Tuesday, October 30, 2012 and was changed due to severe weather conditions related to Hurricane Sandy. The rescheduled earnings announcement will be followed by a conference call at 8:00 a.m. ET on Wednesday, October 31, 2012 for investors and analysts to review these results and discuss the outlook for the fourth quarter and full year 2012. To participate by telephone, domestic participants may dial 1-877-303-2528 and international participants may dial 1-847-829-0023. 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 website, http://investor.mdsol.com. A replay of the conference call can be accessed through Wednesday, November 14, 2012, by dialing 1-800-585-8367 domestically or 1-404-537-3406 internationally, with the passcode 40140106. An archive of the call will also be hosted on the “Investor” section of Medidata’s website, http://investor.mdsol.com, for a limited period of time. About Medidata Solutions Worldwide Medidata Solutions is a leading global provider of cloud-based clinical development solutions that enhance the efficiency of customers’ clinical trials. Medidata’s advanced platform lowers 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.