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ArcSight to Present at William Blair & Company’s 30th Annual Growth Stock Conference

CUPERTINO, CA – June 2, 2010 – ArcSight, Inc. (NASDAQ: ARST), a leading global provider of security and compliance management solutions that protect enterprises and government agencies, today announced that Tom Reilly, chief executive officer, and Stewart Grierson, chief financial officer, will present at the William Blair & Company’s 30th Annual Growth Stock Conference held in Chicago on Wednesday June 16, 2010 at 1:00 p.m. ET / 10:00 a.m. PT.

A live webcast of the presentation will be available on the Investor Relations section of the company’s website at www.arcsight.com.  In addition, an archived webcast of the presentation will be available on the Investor Relations section of the company’s website.

About ArcSight

ArcSight (NASDAQ: ARST) 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. (ARST-IR)

© 2010 ArcSight, Inc.  All rights reserved.  ArcSight and the ArcSight logo are trademarks of ArcSight, Inc.

Investor Relations Contact

Robert Dougherty
415.293.4427
IR@arcsight.com
robert.dougherty@fdashtonpartners.com