ISE Intl Secs Exchange Hldgs

The International Securities Exchange, Inc. (NYSE:ISE) announced today that it will issue its earnings release for the first quarter 2006 on Thursday, April 27, 2006 before the financial markets open. The Company will host a conference call at 11:00 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) 659-1966 and dialing the participant passcode 35471845. Please reserve a line 15 minutes prior to the start of the conference call. The conference call replay will be available from 1:00 p.m. on April 27, 2006 until midnight on April 28, 2006 and can be accessed by calling (888) 286-8010 and dialing the participant passcode 23592545. 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 The International Securities Exchange, the world's largest equity options exchange, was founded on the principle that technology fosters and infuses new efficiencies and operational innovations into securities trading. After developing an innovative market structure that integrated auction market principles into an advanced screen-based trading system, ISE launched the first fully electronic US options exchange in May 2000. ISE continually enhances its trading systems to provide investors with the best marketplace to execute their options orders. For more information about ISE, its products and its technology, visit www.iseoptions.com.