New York, NY— SanDisk Corporation (Nasdaq:SNDK) of Sunnyvale, California, will become a component of the NASDAQ-100 Index® (Nasdaq:NDX), effective at the beginning of trading Thursday, November 13, 2003. SanDisk will also be included in the NASDAQ-100 Index Tracking Stock^SM (Amex:QQQ). SanDisk Corporation will replace Biogen, Inc. (Nasdaq:BGEN), which is scheduled to be acquired by Idec Pharmaceuticals Corporation (Nasdaq:IDPH). Idec will then change its name and symbol to Biogen Idec Inc. and BIIB, respectively.

With a market capitalization of approximately $6.3 billion, SanDisk designs, manufactures and markets industry-standard, solid-state data, digital imaging and audio storage products using its patented, high density flash memory and controller technology.

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 3,400 companies, NASDAQ lists more companies and trades more shares per day than any other U.S. market. 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. For more information about NASDAQ, visit the NASDAQ Web site at www.NASDAQ.com or the NASDAQ Newsroom^SM at www.nasdaq.com/newsroom.
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