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Press Releases

ArcSight to Report Fiscal Fourth Quarter and Full Year 2010 Financial Results

Cupertino, Calif. – May 27, 2010 – ArcSight, Inc. (NASDAQ: ARST) today announced that it will issue a press release reporting financial results for the fiscal fourth quarter and year ended April 30, 2010 after the close of the market on June 10, 2010. ArcSight will host a conference call and live webcast to discuss those financial results for investors and analysts at 2:00 p.m. Pacific Time on June 10, 2010. To access the conference call, dial (877) 303-6129 for the U.S. or Canada and (678) 809-1057 for international callers. The webcast will be available live on the Investor Relations section of the company’s website at www.arcsight.com. An audio replay of the call will also be available to investors by phone beginning at approximately 5:00 p.m. Pacific Time on June 10, 2010 until 9:00 p.m. Pacific Time on June 15, 2010, by dialing (800) 642-1687 for the U.S. or Canada or (706) 645-9291 for international callers, and entering passcode 77371747. In addition, an archived webcast will be available on the Investor Relations section of the company’s website at www.arcsight.com.

About ArcSight

ArcSight (NASDAQ: ARST) is a leading global provider of security and compliance management solutions that protect enterprises 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 Information

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