International Securities Exchange Revises Time Of First Quarter 2006 Earnings Conference Call

The International Securities Exchange (NYSE:ISE) announced today that it has revised the time of its first quarter 2006 earnings conference call scheduled for Thursday, April 27, 2006 to 8:30 a.m. ET rather than 11:00 a.m. ET as previously announced. The earnings press release will be issued that morning prior to the call. All interested parties can listen to a live audio webcast of the conference call 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 10:30 a.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.