ISE Intl Secs Exchange Hldgs

The International Securities Exchange Holdings, Inc. (NYSE:ISE) announced today that it will issue its earnings release for the first quarter of 2007 on Wednesday, April 25, 2007, before the financial markets open. The Company will host a conference call at 8:30 a.m. Eastern Time to discuss the results with the investment community. All interested parties can listen to a live audio webcast that will be hosted on the Investor Relations section of the Company�s web site at www.iseoptions.com. An investor presentation that will be referenced during the call will also be posted to the web site. The conference call can also be accessed by calling (800) 599-9795 and dialing the participant passcode 90542572. Please reserve a line 15 minutes prior to the start of the conference call. The conference call replay will be available from 10:30 a.m. on April 25, 2007 until midnight on April 26, 2007 and can be accessed by calling (888) 286-8010 and dialing the participant passcode 9891666. An archived replay of the call will be available on the Investor Relations section of the Company�s web site at www.iseoptions.com. ISE Background International Securities Exchange Holdings, Inc. (NYSE: ISE), through its subsidiaries, operates a family of innovative securities markets. ISE is founded on the principle that technology and competition create better, more efficient markets for investors and consists of an options exchange, a stock exchange and an alternative markets platform. 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 largest U.S. equity options exchange and is among the leading options exchanges in the world. ISE offers index options, including a portfolio of proprietary index products, and enhanced market data products for sophisticated investors. ISE FX Options� are slated to launch in 2007. ISE Stock Exchange, launched in September 2006 with strategic partners, includes an innovative MidPoint Match� platform which offers investors continuous price improvement. MidPoint Match was integrated with a fully displayed Best Bid Offer market in December 2006. 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 and its options exchange, visit www.iseoptions.com and for more information about ISE Stock Exchange, visit www.isestock.com. Additionally, to learn more about ISE alternative markets technology, visit www.longitude.com.