International Securities Exchange Announces Date of First Quarter 2006 Earnings Release and Conference Call

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 [phone]
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.