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ISE Reports Monthly Volume For November 2005 - Average Daily Volume Increases 22% - Market Leader In Volume For Equity And Index Options - Volume Exceeds Two Million Contracts For Second Consecutive Month

Date 01/12/2005

The International Securities Exchange, Inc. (NYSE:ISE) today reported average daily trading volume for equity and index options contracts for November 2005. Average daily trading volume increased 21.9% to 2.1 million contracts per day as compared to 1.7 million contracts per day during the same period in the prior year. Total equity and index options volume for the month increased 21.9% to 43.1 million contracts from 35.4 million contracts in the same year-ago period.

On a year-to-date basis, average daily trading volume of equity and index options increased 24.6% to 1.8 million contracts traded as compared to 1.4 million contracts traded in the prior year. Total equity and index volume through November 2005 increased 25.1% to 411.0 million contracts from 328.5 million contracts in the same period last year.

Equity and Index Options Volume Statistics
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                     Current Month                Year-to-Date
(000s)         Nov-05   Nov-04  % Change   Nov-05    Nov-04   % Change
----------------------------------------------------------------------
ISE Average
 Daily
 Volume       2,053.8   1,685.1   21.9%    1,779.1    1,428.4   24.6%
ISE Total
 Volume      43,129.2  35,386.5   21.9%  410,964.8  328,530.7   25.1%
Industry
 Average
 Daily
 Volume       7,107.9   5,468.8   30.0%    5,917.0    4,681.3   26.4%
Market Share    28.9%     30.8%   (1.9)      30.1%      30.5%   (0.4)
                                   pts                           pts
----------------------------------------------------------------------


Equity Options Volume Statistics
----------------------------------------------------------------------
                     Current Month                Year-to-Date
(000s)         Nov-05   Nov-04  % Change   Nov-05    Nov-04   % Change
----------------------------------------------------------------------
ISE Average
 Daily
 Volume       2,029.3   1,684.6   20.5%    1,761.7    1,428.1   23.4%
ISE Total
 Volume      42,615.7  35,377.5   20.5%  406,952.3  328,454.2   23.9%
Industry
 Average
 Daily
 Volume       6,485.6   5,020.5   29.2%    5,381.3    4,293.0   25.4%
Market Share    31.3%     33.6%   (2.3)      32.7%      33.3%   (0.5)
                                   pts                           pts
----------------------------------------------------------------------


Index Options Volume Statistics
----------------------------------------------------------------------
                     Current Month                Year-to-Date
(000s)         Nov-05   Nov-04  % Change   Nov-05    Nov-04   % Change
----------------------------------------------------------------------
ISE Average
 Daily Volume    24.5       0.4     N/M      17.4       0.3      N/M
ISE Total
 Volume         513.5       9.0     N/M   4,012.5      76.5      N/M
Industry
 Average
 Daily
 Volume         622.3     448.3    38.8%    535.6     388.3     38.0%
Market Share     3.9%      0.1%  3.8 pts     3.2%      0.1%   3.1 pts
----------------------------------------------------------------------
    Monthly Highlights

    --  ISE was the largest U.S. equity and index options exchange in
        November.

    --  On November 2, 2005, ISE announced its intention to provide
        access to depth of market data beginning in the second quarter
        of 2006 which will increase transparency for investors beyond
        the Best Bid Offer (BBO).

    --  On November 8, 2005, ISE and SuperDerivatives(R) announced
        that the companies have established a marketing and sales
        alliance to jointly promote their products and services.

    --  On November 10, 2005, ISE announced that it currently intends
        to pay regular quarterly cash dividends on its Class A common
        stock for fiscal year 2006.

    --  On November 10, 2005, ISE announced its intent to join the
        Consolidated Tape Association and Consolidated Quotation
        Plans, or CTA/CQ Plans, and the Over-the-Counter/Unlisted
        Trading Privileges Plan, or OTC/UTP Plan in order to be able
        to report stock transactions to the ticker-tape. On November
        17, 2005, ISE joined the OTC/UTP Plan; its CTA/CQ membership
        is still pending.

    --  ISE traded more volume in 565 of 806 issues in its listings
        than any other options exchange.

    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.

This press release contains "forward looking statements." These statements relate to future events or our future financial performance, and involve known and unknown risks, uncertainties and other factors that may cause our actual results, levels of activity, performance or achievements, to be materially different from those contemplated by the forward looking statements. We undertake no ongoing obligation, other than that imposed by law, to update these statements. Factors that could affect our results, levels of activity, performance or achievements and cause them to materially differ from those contained in the forward looking statements can be found in our filings with the Securities and Exchange Commission, including our registration statement on Form S-1, current reports on Form 8-K and quarterly reports on Form 10-Q, as amended.