Keynote Systems (Nasdaq:KEYN), the global leader in on-demand mobile and Internet test & measurement solutions for continuously improving the online experience, will participate at the B. Riley 10th Annual Las Vegas Investor Conference. Management will present at 8:30 a.m. PT on Thursday, March 19, 2009. Presenting from management will be Umang Gupta, chairman and CEO, and Drew Hamer, chief financial officer. The conference is being held at The Palms Casino Resort, Las Vegas, Nevada.

The presentation used at the conference will be available at Keynote’s Web site (www.keynote.com) on the Investor Relations main section.

About Keynote

Keynote Systems (Nasdaq “KEYN”) is the global leader in on-demand test & measurement solutions for continuously improving the online experience. For over a decade, Keynote has been providing measurement data and testing capabilities that allow companies to understand and improve their customers’ online and mobile experience. Keynote has four test and measurement businesses: Web performance, mobile quality, streaming & VoIP, and customer experience/UX.

Known as The Mobile and Internet Performance Authority™, Keynote has a market-leading infrastructure of 2,600 measurement computers and mobile devices in over 240 locations around the world. Keynote’s 2,800 customers represent top Internet and mobile companies including American Express, Dell, Disney, eBay, E*TRADE, Expedia, Microsoft, SonyEricsson, Sprint, T-Mobile, Verizon, Vodafone and YouTube.

Keynote Systems, Inc. is headquartered in San Mateo, California and can be reached at www.keynote.com or by phone in the U.S. at 1-800-KEYNOTE.

Keynote, The Internet Performance Authority, Perspective and WebEffective are registered trademarks and The Mobile and Internet Performance Authority and True Experience are trademarks of Keynote Systems, Inc. Other trademarks are the property of their respective owners. © 2009 Keynote Systems, Inc.