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Patterson Dental Company To Join The NASDAQ-100 Index

Date 09/12/2002

Patterson Dental Company (NASDAQ:PDCO) of St. Paul, Minnesota, will become a component of the NASDAQ-100 Index® (NASDAQ:NDX), effective at the beginning of trading Monday, December 16, 2002. Patterson Dental will also be included in the NASDAQ-100 Index Tracking StockSM (Amex:QQQ). Patterson Dental Company will replace Gemstar-TV Guide International Inc. (NASDAQ:GMSTE), which is no longer eligible for inclusion in the Index.

With a market capitalization of approximately $2.8 billion, Patterson Dental Company is a value-added distributor serving the North American dental supply and companion-pet veterinarian supply markets.

The NASDAQ-100 Index, launched in January 1985, is one of the most widely followed benchmarks in the world. The NASDAQ-100 Index Tracking Stock represents ownership in the Nasdaq-100 Trust. The Trust holds a portfolio of equity securities that compose the NASDAQ-100 Index and aims to provide investment results that generally correspond with its performance.

NASDAQ (OTCBB:NDAQ) is the world's largest electronic stock market. With approximately 3,800 companies, NASDAQ lists more companies and trades more shares per day than any other U.S. market. Over the past five years, NASDAQ has outpaced all other U.S. markets in listing IPOs. It is home to category-defining companies that are leaders across all areas of business including technology, retail, communications, financial services, media and biotechnology industries. NASDAQ is a key driver of capital formation. For more information about Nasdaq, visit the Nasdaq Web site at www.nasdaq.com or the Nasdaq NewsroomSM Web site at www.nasdaqnews.com .