Medidata Solutions Announces Exercise of Over-Allotment Option and Closing of Initial Public Offering

FOR IMMEDIATE RELEASE
 
Medidata Solutions Announces Exercise of Over-AllotmentOption and Closing of Initial Public Offering

NEW YORK – June 30, 2009 – Medidata Solutions, (Nasdaq: MDSO), a leading global provider of hosted clinical development solutions, today announced that the underwriters of its initial public offering exercised in full their over-allotment option to purchase an additional 945,000 shares of Medidata’s common stock at a public offering price of $14.00 per share, less underwriting discounts and commissions, from certain selling stockholders. The option was granted in connection with Medidata’s initial public offering of 6,300,000 shares of its common stock, which priced on June 24, 2009. The closing of the sale of all of the 7,245,000 shares by Medidata and the selling stockholders to the underwriters occurred earlier today.

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

Credit Suisse Securities (USA) LLC
Prospectus Department
One Madison Avenue
New York, N.Y. 10010
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.

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