(EMAILWIRE.COM, March 19, 2001 ) WHAT: Ameritrade Holding Corporation (Nasdaq: AMTD), Keynote Systems, Inc.(Nasdaq: KEYN) and Sun Microsystems, Inc. (Nasdaq: SUNW) will make anannouncement at a market opening ceremonyWHO: Jim Ditmore, Chief Information Officer, Ameritrade HoldingCorporation Richard Burk, senior vice president, Keynote Systems, Inc. John Loiacono, Chief Marketing Officer, Sun Microsystems,Inc. WHEN: Tuesday, March 20, 2001 9:30 am ESTWHERE: Nasdaq MarketSite 4 Times Square 43rd & Broadway - 2nd Floor New York, NYRSVP: Reporters interested in attending the market openingceremony should contact Eric Linzer, Della Lowe, or Kasey Holman to obtainproper credentials to enter the Nasdaq MarketSite and schedule interviews.Please call them by 5 pm EST Monday, March 19, 2001.BACKGROUND: Ameritrade Holding Corporation(www.amtd.com) is a pioneer in the online brokerage industry with a 25-yearhistory of providing customers a self-directed approach to brokerageservices. The award-winning company, through its broker dealersubsidiaries, provides brokerage and clearing services to self-directedindividual consumer investors and to financial institutions. Keynote Systems (Nasdaq "KEYN"), TheInternet Performance Authority®, is the worldwide leader in Internetperformance services that improve the quality of e-business. Approximately3,000 corporate IT departments, Web hosting companies and Internet serviceand content delivery providers around the world have implemented thecompany's easy-to-use and cost-effective services to benchmark and managethe performance of their Web sites. Keynote was founded in 1995 and isheadquartered in San Mateo, California. The company can be reached atwww.keynote.com or by phone in the U.S. at 1-650-522-1000. Since its inception in 1982, a singularvision -- The Network Is The ComputerTM -- has propelled Sun Microsystems,Inc. (Nasdaq: SUNW), to its position as a leading provider ofindustrial-strength hardware, software and services that power the Internetand allow companies worldwide to take their businesses to the nth. With$19.2 billion in annual revenues, Sun can be found in more than 170countries and on the World Wide Web at http://sun.com.CONTACTS:At Ameritrade: At Keynote:Donna Kush Della LoweDirector, Public Relations Public Relations(402) 827-8931 (650) 522-1090(402) 216-5486 (cell) (650) 868-5829 (cell)dkush@ameritrade.com della.lowe@keynote.comAt Sun Microsystems, Inc.: At Arnold PublicRelations:Kasey Holman Media ContactPublic Relations Eric Linzer650-786-3411 (617) 587-8928800-716-2610 (pager) (617) 596-7378(cell)kasey.holman@sun.com elinzer@arn.comJason PfannenstielPublic Relations Keynote Systems, Inc.jasonp@keynote.com(650) 522-1343

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