LEXINGTON, Mass. -- Network Security Company Named One of the Fastest Growing Private Companies in the United States

Inc. Magazine, the premier publication for small and medium-sized businesses, ranked Arbor Networks as one of the top ten growing technology companies in the United States. With a three year growth rate of 4,651%, Arbor Networks ranked No. 9 overall on Inc. Magazine's Inc. 500, one of the most prestigious lists of fastest growing private companies.

Arbor Networks provides the most widely-used security appliances for the prevention of distributed denial of service attacks, fast-spreading worms and internal network misuse. Arbor's Peakflow network security platform is used by Fortune 1000 companies and by more than 70 percent of the world's service providers, including AT&T, British Telecom, Comcast, EarthLink, MCI, and NTT Com.

"The security threats facing companies today are growing as attacks become more sophisticated and frequent," said Arbor Networks' CEO Jack Boyle. "Arbor Networks' high sales growth is a reflection of the hard work we have done to prevent these attacks from harming our customer's businesses. We are honored to be recognized for our success and are continuing to innovate as we develop technologies to protect our customers' networks."

The recognition by Inc. comes on the heels of two other prestigious awards recognizing Arbor Networks this year. They include Red Herring's Top Ten Companies to Watch and the Deloitte Fast 50 Rising Star.

The Inc. 500 ranks privately held companies according to averaged year-over-year sales growth over the past four years. With approximately 75% of all new job creation in the U.S. coming from small businesses, the Inc. 500 is a prescient indicator of the companies and industries that are driving the economy forward. Over the years, the Inc. 500 has identified the next generation of world-class companies, with Microsoft, Stonyfield Farms, Timberland, Oracle, The Princeton Review, Morningstar, E* Trade, Intuit, and Domino's Pizza all appearing on the list before they became industry powerhouses.

About Arbor Networks

Arbor Networks ensures the security and operational integrity of the world's most critical networks. Arbor's solutions are based on the proven Peakflow platform, intelligent technology for network-wide data collection, analysis, anomaly detection, and threat mitigation. Peakflow provides real-time views of network activity enabling organizations to instantly protect against phishing, botnets, DDoS attacks, worms, insider misuse, and traffic and routing instability, as well as segment and harden networks from future threats. Peakflow successfully prevents costly downtime, network cleanup, and loss of customer confidence. Arbor is headquartered in Lexington, MA, with a research and development office in Ann Arbor, MI and overseas headquarters in London and Beijing. For more information, go to www.arbornetworks.com.

About Inc. Magazine

Inc., the only business magazine dedicated exclusively to owners and managers of fast-growing private companies, delivers real solutions for today's innovative company builders. It provides hands-on tools and market-tested strategies for managing people, finances, sales, marketing and technology. Inc. is the premier publication that focuses on small to medium-size businesses, which are responsible for more than half the nation's gross domestic product and 75% of its new jobs. And Inc. looks beyond work to address the entrepreneurial lifestyle. Inc., a Gruner & Jahr USA publication, inspires and informs, with cutting-edge coverage that reflects its readers' energy, brashness, and imagination.