SOURCEFIRE NAMED #1 RISING STAR IN DELOITTE’S TECHNOLOGY FAST 50 PROGRAM FOR MARYLAND

Columbia, Md., October 11, 2004 - Sourcefire, Inc., the world leader in real-time network defense, has been named the top Rising Star in Deloitte’s Technology Fast 50 program for Maryland in recognition of its 5884% growth over the past three years. The Rising Star award is a special designation for fast-growth technology companies that have been in business just three or four years and is part of the Maryland Technology Fast 50 program, which ranks the 50 fastest growing technology companies headquartered in Maryland. Rankings are based on the percentage of growth in fiscal year revenues over three years (2001 to 2003). Wilmer, Cutler, Pickering, Hale and Dorr is the sponsor for this year’s Maryland Technology Fast 50 program and PR Newswire is the official media partner.

“Sourcefire is an innovative company with an unrivaled management team that is capable of identifying key customer needs and developing solutions that not only address those requirements, but provide exponential value that the customer hadn’t thought possible,” said Harry Weller, Partner at New Enterprise Associates. “As an investor, New Enterprise Associates recognized the value Sourcefire could provide, and we are pleased that customers are finding even greater value than we originally anticipated.”

Sourcefire was founded by Martin Roesch, creator of Snort, the world’s most widely deployed Intrusion Detection System with more than 2 million downloads to date. The company’s growth has been fueled by its innovative security technologies, which enable companies to protect their assets at a time when traditional perimeter defenses, such as firewalls, are proving ineffective at preventing threats. As new applications and technologies, such as wireless and remote access, introduce new threats from both outside and within the network, Sourcefire is transforming the way companies secure their networks with real-time discovery and protection throughout their entire environment.

“The Deloitte Maryland Technology Fast 50 Rising Star companies have shown the strength, vision and temerity to succeed despite a very challenging technology environment,” said Gary H. Tabach of Deloitte’s Technology, Media & Telecommunications Practice and Office Managing Partner for Deloitte’s McLean, Virginia office. “We applaud the successes of Sourcefire and acknowledge their place as the top Rising Star winner with 5884% growth over the past three years.”

“ We are honored to be recognized by Deloitte and PR Newswire for our strong performance,” said Wayne Jackson, Sourcefire’s CEO. “In today’s complex network environments where perimeter defenses are no longer adequate, companies need security solutions that identify vulnerabilities the instant they appear, detect compromised assets in real-time and enforce network policies on a persistent basis. Sourcefire is the only company that has been able to address these needs and this recognition is directly tied to the value that we are delivering to our customers.”

To qualify for the Technology Fast 50 Rising Star program, companies must have had operating revenues of at least $50,000 in 2001 and $1,000,000 in 2003, must be public or private companies headquartered in North America, and be a “technology company” defined as owning proprietary technology that contributes to a significant portion of the company’s operating revenues (using other companies’ technology in a unique way does not qualify); and/or devoting a significant proportion of revenues to research and development of technology.

Rising Star winners are automatically entered in the Deloitte Technology Fast 500 program’s Rising Star category. The Deloitte Technology Fast 500 program ranks North America’s top 500 fastest growing technology companies based on revenue growth over . five years (1999–2003). Its Rising Star ranking is based on revenue growth over three years (2001–2003). For more information on the Deloitte Technology Fast 50 or Fast 500 programs, visit www.fast500.com.

About Sourcefire
Sourcefire, Inc., the world leader in real-time network defense solutions, is transforming the way organizations manage and minimize network security risks with its 3D Approach - Discover, Determine, Defend - to securing real networks in real-time. The company's ground-breaking network defense system unifies intrusion and vulnerability management technologies to provide customers with the most effective network security available. Founded in 2001 by the creator of Snort, Sourcefire is headquartered in Columbia, MD and has received numerous accolades including being named a 2004 Company to Watch by Network Computing Magazine and selected as one of the Red Herring Top 100 privately held companies. At work in leading Fortune 100 and government agencies, the names Sourcefire and founder Martin Roesch have grown synonymous with innovation and intelligence in network security. For more information about Sourcefire, please visit www.sourcefire.com

About Deloitte
Deloitte refers to one or more of Deloitte Touche Tohmatsu, a Swiss Verein, its member firms, and their respective subsidiaries and affiliates. Deloitte Touche Tohmatsu is an organization of member firms around the world devoted to excellence in providing professional services and advice, focused on client service through a global strategy executed locally in nearly 150 countries. With access to the deep intellectual capital of 120,000 people worldwide, Deloitte delivers services in four professional areas — audit, tax, consulting, and financial advisory services — and serves more than one-half of the world’s largest companies, as well as large national enterprises, public institutions, locally important clients, and successful, fast-growing global growth companies. Services are not provided by the Deloitte Touche Tohmatsu Verein, and, for regulatory and other reasons, certain member firms do not provide services in all four professional areas.

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In the U.S., Deloitte & Touche USA LLP is the member firm of Deloitte Touche Tohmatsu, and services are provided by the subsidiaries of Deloitte & Touche USA LLP (Deloitte & Touche LLP, Deloitte Consulting LLP, Deloitte Tax LLP, and their subsidiaries) and not by Deloitte & Touche USA LLP. The subsidiaries of the U.S. member firm are among the nation’s leading professional services firms, providing audit, tax, consulting, and financial advisory services through nearly 30,000 people in more than 80 cities. Known as employers of choice for innovative human resources programs, they are dedicated to helping their clients and their people excel. For more information, please visit the U.S. member firm’s website at www.deloitte.com/us.
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As used in this document the term “Deloitte” includes Deloitte & Touche LLP, Deloitte Consulting LLP and Deloitte Tax LLP.