The Euronext 100 Index is the blue chip index of the pan-European exchange, Euronext NV. It comprises the largest and most liquid stocks traded on Euronext. Each stock must trade more than 20 percent of its issued shares over the course of the rolling one year analysis period. The index is reviewed quarterly through a size and liquidity analysis of the investment universe. As of December 21, 2002, the stocks in the Euronext100 Index represent 80% of the total market capitalization of Euronext’s investment universe. Each stock in the index is given a sector classification. Wikipedia