Medidata Solutions, Inc. Prices Initial Public Offering

NEW YORK--(BUSINESS WIRE)--Medidata Solutions, a leading global provider of hosted clinical development solutions, today announced the pricing of its initial public offering of 6,300,000 shares of common stock at $14.00 per share. In addition, selling stockholders have granted the underwriters a 30-day option to purchase up to 945,000 shares of common stock at the initial public offering price to cover over-allotments, if any. Medidata’s common stock will commence trading on the NASDAQ Global Market on June 25, 2009, under the ticker symbol “MDSO.”

Citi and Credit Suisse Securities (USA) LLC acted as joint bookrunning managers for the proposed offering. Jefferies & Company, Inc. and Needham & Company, LLC acted as co-managers.

A registration statement relating to these securities was declared effective by the Securities and Exchange Commission on June 24, 2009. Any offer or sale will be made only by means of a written prospectus forming part of the effective registration statement. A copy of the final prospectus may be obtained directly from:

Citi Brooklyn Army Terminal 140 58th Street, 8th Floor Brooklyn, N.Y. 11220 Telephone: (800) 831-9146 Telephone: (800) 221-1037

This press release does not constitute an offer to sell or a solicitation of an offer to buy the securities in this offering, nor shall there be any sale, offer or solicitation of these securities in any state or jurisdiction in which such sale, offer or solicitation would be unlawful prior to registration or qualification under the securities laws of any state or jurisdiction.

Contact:

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