SOURCEFIRE Files Registration Statement For Initial Public Offering

Published 26th October 2006

Columbia, MD—October 25, 2006 -- Open source innovator, Sourcefire, Inc., a leader in network intrusion prevention, today announced that it filed a registration statement with the Securities and Exchange Commission for an initial public offering of common stock. The number of shares to be offered and the price range for the offering have not yet been determined. Sourcefire and certain of its stockholders are expected to sell the shares to be offered.

The sole lead book-running manager of the offering will be Morgan Stanley & Co. Incorporated. Lehman Brothers Inc. will serve as co-lead manager and UBS Securities LLC and Jefferies & Company, Inc. will serve as co-managers. When available, a preliminary prospectus relating to the offering may be obtained by emailing prospectus@morganstanley.com, or by contacting the prospectus department at Morgan Stanley, 1585 Broadway, New York, NY 10036 (212-761-6775).

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

SOURCEFIRE®, SNORT®, the Sourcefire logo, the Snort and Pig logo, SECURITY FOR THE REAL WORLD™, SOURCEFIRE DEFENSE CENTER™, SOURCEFIRE 3D™, RNA™ and certain other trademarks and logos are trademarks or registered trademarks of Sourcefire, Inc. in the United States and other countries.