Interxion Announces Commencement of Initial Public Offering

AMSTERDAM 12 January 2011 – Interxion Holding N.V., a leading European provider of colocation data center services, announced today that it has commenced an initial public offering of 18,550,000 ordinary shares. Interxion is offering 16,250,000 ordinary shares and certain selling shareholders are offering 2,300,000 ordinary shares. The estimated price range for the initial public offering is $11.00 to $13.00 per ordinary share.

Interxion has applied to have the ordinary shares approved for listing on The New York Stock Exchange under the ticker symbol "INXN." The underwriters have a 30-day option to purchase from certain selling shareholders up to an additional 2,782,500 ordinary shares.

BofA Merrill Lynch, Citi and Barclays Capital will act as joint bookrunning managers for the offering. The offering of these securities will be made by means of a prospectus. Copies of the preliminary prospectus relating to the offering may be obtained by contacting:

• BofA Merrill Lynch, 4 World Financial Center, New York, NY 10080, Attn: Prospectus Department or email dg.prospectus_requests@baml.com;
• Citi, Brooklyn Army Terminal, Attn: Prospectus Dept., 140 58th Street, 8th floor, Brooklyn, NY 11220. By telephone: (800) 831-9146 or by email at batprospectusdept@citi.com; or
• Barclays Capital, c/o Broadridge Financial Solutions, 1155 Long Island Ave. Edgewood, NY 11717. By telephone at (888) 603-5847 or by email at barclaysprospectus@broadridge.com.

A registration statement relating to these securities has been filed with the Securities and Exchange Commission but has not yet become effective. These securities may not be sold nor may offers to buy be accepted prior to the time the registration statement becomes effective.

The preliminary prospectus is also available at www.sec.gov

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