INVESTOR ALERT: KGS Announces That Lawsuit Against Sourcefire, Inc. Has Expanded Defendants and Now Includes Underwriters

NEW ORLEANS, LA -- (MARKET WIRE) -- May 22, 2007 -- Kahn Gauthier Swick, LLC ("KGS") announces that it has filed suit against Sourcefire, Inc. ("Sourcefire" or the "Company") (NASDAQ: FIRE), in the United States District Court for the District of Maryland, on behalf of shareholders who purchased shares of the Company in connection with its Initial Public Offering ("IPO") on or about March 9, 2007, or thereafter in the open market. KGS has expanded the lawsuit's defendants beyond the Company, Board of Directors and CFO, to include the underwriters involved in the Offering (including, Morgan Stanley, Lehman Bros., UBS Securities and Jeffries & Co.), who are each charged with including or allowing the inclusion of materially false and misleading statements in the Registration Statement and Prospectus issued in connection with the IPO, in direct violation of the Securities Act of 1933.

IMPORTANT: SOURCEFIRE SHAREHOLDERS HAVE ONLY UNTIL JULY 13, 2007 TO MOVE FOR APPOINTMENT AS LEAD PLAINTIFF IN THIS SECURITIES CLASS ACTION LAWSUIT. SHAREHOLDERS MAY CONTACT KGS MANAGING PARTNER LEWIS KAHN DIRECTLY TOLL FREE 1-866-467-1400, EXT. 100, OR VIA EMAIL LEWIS.KAHN@KGSCOUNSEL.COM FOR MORE INFORMATION.

The defendants are charged with failing to conduct an adequate due diligence investigation into the Company prior to the IPO, and that they failed to disclose that the Company was not operating according to plan regardless of the fact that the first quarter of 2007 was weeks away from closing, despite Sourcefire not closing its contracts according to schedule.

The Complaint alleges that on Friday, April 6, 2007, a day the markets were closed in observance of "Good Friday" -- after defendants and other Company insiders liquidated at least $6.75 million of their personally held shares in or in connection with the IPO -- Sourcefire revealed the truth about the Company, including the problems that existed at the time of the IPO, which would result in extremely disappointing 1Q:07 results. The next trading day, Monday, April 9, 2007, Sourcefire Shares fell almost 30%, plummeting from $17.35 per share to close at $12.28 per share on heavy volume of over 1.629 million shares.

If you purchased shares of Sourcefire in connection with the IPO or if you purchased shares thereafter in the open market, you are urged to contact Lewis Kahn, Managing Partner, KGS, toll free 1-866-467-1400, ext. 100, via cell phone at 504-301-7900, or by email at lewis.kahn@kgscounsel.com to learn about your legal rights and how this action may benefit you. For further information on KGS, please visit www.kgscounsel.com.

SPECIAL NOTICE: Because Courts generally appoint only one firm to prosecute a securities fraud action on behalf of the "lead plaintiffs," who serve to guide the litigation on behalf of the shareholders, it is critically important that interested parties carefully evaluate any other firm that may be competing with KGS to prosecute the Sourcefire class action. Critical components of a law firm's ability to successfully prosecute this action and obtain a strong recovery for you include its knowledge of applicable federal securities laws, the resources it will dedicate to prosecution of the case, including the number of lawyers the firm has available for the Sourcefire class action, AND especially the quality of the firm's work. Interested shareholders are encouraged to call for consultation and to request more information about KGS.

Contact Information: Contact: Lewis Kahn KGS 1-866-467-1400, ext. 100 email: lewis.kahn@kgscounsel.com