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ISE Reports Monthly Volume For December 2005 - Average Daily Volume Increases 22% For The Month - Full Year 2005 Volume Increases 24% To A Record Of 1.8 Million Contracts Traded - 4Q 2005 Average Daily Volume Of 2.1 Million Contracts

Date 03/01/2006

The International Securities Exchange, Inc. (NYSE:ISE) today reported average daily trading volume for equity and index options contracts for December 2005. Average daily trading volume increased 22.3% to 1.8 million contracts per day as compared to 1.5 million contracts per day during the same period in 2004. Total equity and index options volume for the month increased 16.7% to 37.7 million contracts from 32.3 million contracts in the same year-ago period.

For the year 2005, average daily trading volume of equity and index options increased 24.3% to a record 1.8 million contracts traded as compared to 1.4 million contracts traded in 2004. Total equity and index volume for 2005 increased 24.3% to 448.7 million contracts from 360.9 million contracts in 2004.

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