ArcSight Ranked Number 236 Fastest Growing Company in North America on Deloitte's 2009 Technology Fast 500

Attributes Revenue Growth to Need for Cyber Security and Compliance Solutions

• Press Release
• Source: ArcSight, Inc.
• On 3:13 pm EDT, Wednesday October 21, 2009

CUPERTINO, Calif.--(BUSINESS WIRE)--ArcSight, Inc. (NASDAQ: ARST - News), a leading global provider of security and compliance management solutions that protect enterprises and government agencies, today announced that it ranked number 236 on Technology Fast 500™, Deloitte LLP’s ranking of 500 of the fastest growing technology, media, telecommunications, life sciences and clean technology companies in North America. Rankings are based on percentage of fiscal year revenue growth during the five-year period from 2004 – 2008. ArcSight’s revenue grew from $15.3 million in fiscal 2004 to $101.5 million in fiscal 2008.

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ArcSight CEO Tom Reilly credits the company’s growth over the past five years to the need for cyber security and compliance solutions to enable businesses and government agencies to reduce risk and increase visibility across their IT infrastructure. He said, “Cyber criminals continue to refine their tactics in order to take advantage of all the new opportunities afforded by the vast amount of valuable data housed online, made even more accessible by increasing connectivity. Companies are saying that they need to move beyond monitoring just the network infrastructure and look for threats and risks across the entire enterprise.”

“Technology Fast 500™ recognizes innovative companies that have broken down barriers to success and defied the odds with their remarkable five-year revenue growth,” said Phil Asmundson, Vice Chairman and U.S. Technology, Media and Telecommunications leader, Deloitte LLP. “We congratulate ArcSight on this accomplishment.”

“With its impressive five-year growth, ArcSight has earned its position among the fastest growing technology, media, telecommunications, life sciences and clean technology companies in North America,” said Mark Jensen, Managing Partner, Technology and Venture Capital Services, Deloitte & Touche LLP. “Deloitte is proud to honor ArcSight for its achievement.”

Overall, Technology Fast 500™ award winners for 2009 had growth rates ranging from 212 to 146,050 percent over five years, with an average growth rate of 2,486 percent.

Technology Fast 500™ Selection and Qualifying Criteria

Technology Fast 500™ provides a ranking of the fastest growing technology, media, telecommunications, life sciences and clean technology companies in North America. This ranking is compiled from nominations submitted directly to the Technology Fast 500™ website, and public company database research conducted by Deloitte. Technology Fast 500™ award winners for 2009 are selected based on percentage fiscal year revenue growth during the five year period from 2004 to 2008.

Deloitte’s 2009 Technology Fast 500TM Media Guidance 4

In order to be eligible for Technology Fast 500™ recognition, companies must own proprietary intellectual property or proprietary technology that contributes to a significant portion of the company's operating revenues. Using other companies' technology or intellectual property in a unique way does not satisfy this requirement. Consulting companies, professional service firms, etc. are not eligible unless they have proprietary technology that contributes to a significant portion of their operating revenues.

Technology Fast 500™ award eligibility requirements also include base-year operating revenues of at least $50,000 USD or CD, and current-year operating revenues of at least $5 million USD or CD. These revenues must have more than doubled between 2004 and 2008. Additionally, companies must be in business for a minimum of five years, and be headquartered within North America.

About ArcSight

ArcSight (NASDAQ: ARST - News) is a leading global provider of security and compliance management solutions that protect businesses and government agencies. ArcSight identifies, assesses, and mitigates both internal and external cyber threats and risks across the organization for activities associated with critical assets and processes. With the market-leading ArcSight SIEM platform, organizations can proactively safeguard their assets, comply with corporate and regulatory policy and control the risks associated with cyber-theft, cyber-fraud, cyber-warfare and cyber-espionage. For more information, visit www.arcsight.com.

About Deloitte

As used in this document, “Deloitte” means Deloitte LLP. Please see www.deloitte.com/about for a detailed description of the legal structure of Deloitte LLP and its subsidiaries.

Forward Looking Statement and Other Disclaimers

This news release contains forward-looking statements, including without limitation ArcSight’s belief that cyber criminals will continue to refine their tactics in order to take advantage of all the new opportunities afforded by the vast amount of valuable data housed online, made even more accessible by increasing connectivity; and the company’s belief that companies will move beyond monitoring just the network infrastructure and look for threats and risks across the entire enterprise. These forward-looking statements are subject to material risks and uncertainties that may cause actual results to differ substantially from expectations. Investors should consider important risk factors, which include: the risk that cyber threats may not continue to rise or that potential customers may not perceive the benefit of addressing those threats with products such as ArcSight’s; the risk that organizations will not appreciate the value of monitoring beyond the network infrastructure; and other risks detailed under the caption “Risk Factors” in the ArcSight Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission, or the SEC, on September 9, 2009 and the company’s other filings with the SEC. You can obtain copies of the company’s Quarterly Report on Form 10-Q and its other SEC filings on the SEC’s website at www.sec.gov.

ArcSight’s historical growth rates described in this release are not necessarily indicative of the results to be expected for any future period.

Atomic PR for ArcSight
Chris Fucanan, 415-402-0230
chris.fucanan@atomicpr.com