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ISE Declares Contingent Quarterly Dividend

Date 07/11/2007

The International Securities Exchange Holdings, Inc. (NYSE: ISE) announced that on November 6, 2007, its Board of Directors declared that in the event the merger with Eurex has not closed by December 31, 2007, a quarterly dividend of $0.05 per outstanding share of its Class A Common Stock will be paid on or about December 31, 2007 to holders of record as of the close of business on December 24, 2007.

ISE Background
International Securities Exchange Holdings, Inc. (NYSE: ISE), through its subsidiaries, operates a family of innovative securities markets. Founded on the principle that technology and competition create better, more efficient markets for investors, ISE consists of an options exchange, a stock exchange, an alternative markets platform, and a market data business. ISE continually enhances its trading systems and develops new products to provide investors with the best marketplace and investment tools to trade smarter.

ISE developed a unique market structure for advanced screen-based trading systems and in May 2000 launched the first fully electronic US options exchange. Currently, ISE operates the world's largest equity options exchange. ISE offers index options, including a portfolio of proprietary index products, and enhanced market data products for sophisticated investors. ISE FX Options(SM )launched in the second quarter of 2007.

ISE Stock Exchange, launched in September 2006, is a completely electronic marketplace and the only dual structure platform that integrates a dark pool, MidPoint Match(SM), with a fully displayed stock market. Midpoint Match is a proprietary, non-displayed market that trades equity securities at the midpoint between the National Best Bid and Offer (NBBO).

ISE's alternative markets business currently consists of an events market trading platform known as Longitude. Longitude's patented and proprietary technology provides a unique parimutuel structure for derivatives auctions which results in greater trading and pricing flexibility for market participants.
For more information about ISE, visit www.ise.com.