NW_20000406_VASCO Commences Trading on the NASDAQ National Market

April 6, 2000

OAKBROOK TERRACE, Illinois and BRUSSELS, Belgium, April 6, 2000 - VASCO Data Security International, Inc. (Nasdaq: VDSI; www.vasco.com announced today that its class of Common Stock will begin trading on the Nasdaq National Market under the symbol "VDSI" at the opening of trading on Friday, April 7, 2000 VASCO previously traded on the Electronic Bulletin Board under the same symbol.

In announcing the listing, Mr. Mario Houthooft, VASCO's President and Chief Executive Officer, said, "We are very pleased to begin trading our securities on the Nasdaq National Market."


VASCO designs, develops, markets and supports security products and services which manage and secure access to computer systems of corporate and governmental clients, and enables secure financial transactions made over private enterprise networks and public networks, such as the Internet.

For more information please contact:

Media: Kerry Roche, Bridgeman Communications, +1 617 742 7270, [email protected]
Investor Relations: Todd Fromer, KCSA Public Relations Worldwide, +1 212 682 6300, [email protected]
VASCO: Mike Lange, +1 630 932 8844, [email protected]

Media (Benelux): Bob Pieters, Anthonissen & Associates, +32 3 286 7777, [email protected]
Media (Europe/Asia): Sven Kersten, HBI, +49 89 99 38 87 33, [email protected]
Investor Relations: Annemieke Blondeel, LBConsult, +44 208 308 7080, [email protected]
VASCO: Ariane Bosmans, +32 2 456 9810, [email protected]