Medidata Solutions, Inc. (MDSO) Chief Executive Officer Tarek Sherif and President Glen de Vries preside over the opening bell to celebrate the company's initial public offering on NASDAQ.

About Medidata Solutions, Inc.:

Medidata Solutions, Inc. (www.mdsol.com) is a leading global provider of hosted clinical development solutions that enhance the efficiency of customers' clinical development processes and optimize their research and development investments. Medidata products and services allow customers to achieve clinical results more efficiently and effectively by streamlining the design, planning and management of key aspects of the clinical development process, including protocol development (Medidata Designer(tm)), investigator benchmarking and budgeting (Medidata Grants Manager), contract research organization (CRO) benchmarking and budgeting (Medidata CRO Contractor(tm)), and the capture, management, analysis and reporting of clinical trial data (Medidata Rave(r)). Medidata's diverse customer base spans pharmaceutical, biotechnology and medical device companies, academic institutions, CROs and other research organizations, and includes more than 20 of the top 25 global pharmaceutical companies.

About NASDAQ OMX:

The NASDAQ OMX Group, Inc. is the world's largest exchange company. It delivers trading, exchange technology and public company services across six continents, with over 3,900 listed companies. NASDAQ OMX Group offers multiple capital raising solutions to companies around the globe, including its U.S. listings market; NASDAQ OMX Nordic, NASDAQ OMX Baltic, including First North; and the U.S. 144A sector. The company offers trading across multiple asset classes including equities, derivatives, debt, commodities, structured products and ETFs.

NASDAQ OMX Group technology supports the operations of over 70 exchanges, clearing organizations and central securities depositories in more than 50 countries. NASDAQ OMX Nordic and NASDAQ OMX Baltic are not legal entities but describe the common offering from NASDAQ OMX Group exchanges in Helsinki, Copenhagen, Stockholm, Iceland, Tallinn, Riga, and Vilnius. For more information about NASDAQ OMX, visit http://www.nasdaqomx.com.

Organizations interested in obtaining NASDAQ-listed company bell ringing ceremony photographs for press purposes, must first receive approval from the listed company before requesting photographs from NASDAQ. Please provide the company contact information from whom you received approval to Jolene Libretto at jolene.libretto@nasdaq.com. Kindly credit © 2009, The NASDAQ OMX Group, Inc. Reprinted with permission.

For all other photography inquiries, please contact NASDAQ’s photographer, Zef Nikolla at zef.nikolla@nasdaqomx.com.

© 2009, The NASDAQ OMX Group, Inc. Reprinted with permission.

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