ISE Declares Quarterly Dividend

The Board of Directors of the International Securities
Exchange (NYSE:ISE) today declared a quarterly dividend of $0.05 per
outstanding share of its Class A Common Stock. The dividend is payable
on March 31, 2006, to holders of record as of the close of business on
March 23, 2006.

   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.