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International Securities Exchange Holdings, Inc. Reports Record Earnings For Fourth Quarter And Full Year 2006

Date 06/02/2007

Fourth Quarter Financial Highlights

  • GAAP diluted earnings per share of $0.38


  • Proforma diluted earnings per share of $0.41


  • Net income up 51.3% to $15.1 million


  • Average daily trading volume up 17.3% to 2.4 million equity and index options contracts


  • Revenues up 22.4% to $53.3 million; Gross margin up 27.3% to $47.6 million


  • Record pre-tax margin of 55.8%

The International Securities Exchange Holdings, Inc. (NYSE:ISE) today reported that net income for the quarter ended December 31, 2006 increased 51.3% to $15.1 million, or $0.38 per share on a fully diluted basis. This compares to $10.0 million, or $0.26 per share on a fully diluted basis, in the same period in 2005. Included in the results for the quarter are adjustments of $1.2 million for the recovery of legal fees associated with our successful litigation to list options on SPDRs without a license, and $3.3 million for reimbursements to members due to an error in our billing system. Excluding these items, proforma net income for the quarter increased to $16.3 million, or $0.41 per share on a fully diluted basis.

Total revenues for the quarter increased 22.4% to $53.3 million versus $43.6 million in the prior year. Gross margin, or total revenues less cost of revenues, increased 27.3% to $47.6 million from $37.4 million in the fourth quarter of 2005. The average daily volume of equity and index options contracts traded increased 17.3% to 2.4 million contracts as compared to 2.1 million contracts in the year-ago quarter.

"We ended the year with another strong quarter of continued growth in our average daily volume and the successful implementation of our new business initiatives," said David Krell, ISE's President and Chief Executive Officer. "For the first time in our history, we posted average daily volumes in excess of two million contracts for each quarter and for the full year. We also made steady progress in building our new equities business, the ISE Stock Exchange, as we further expanded into new markets beyond our options business. The successful launch of our fully-displayed market was an important milestone as we prepare for the regulatory and competitive changes that we anticipate will occur later this year."

"All of our key business metrics remain robust. The double digit growth in trading volume, revenues, and profitability demonstrate the depth, breadth and leverage of our business model. Today's economic and competitive environment will present many opportunities and challenges in the year ahead, and we believe that our business model, strategy and management team are positioned to succeed," concluded Krell.

Fourth Quarter Results

Revenues

Transaction fee revenues increased to $40.9 million from $33.7 million last year due to continued strong growth in trading volumes. Member fees and other revenues increased to $7.5 million from $5.6 million in the same period last year due to an increase in connectivity fees which are charged to market makers based on quote capacity usage. There was also an increase in connectivity fees from our subsidiary, Longitude. Market data revenues increased to $5.0 million from $4.3 million in the prior year quarter.

Cost of Revenues, Gross Margin

Cost of revenues for the fourth quarter decreased to $5.8 million as compared to $6.2 million in the same period last year since we no longer pay a license fee for trading options on certain ETFs.

Gross margin increased to $47.6 million from $37.4 million in the fourth quarter of 2005.

Expenses

Total direct expenses for the fourth quarter of 2006 increased to $22.0 million as compared to $19.4 million in the fourth quarter of 2005 principally due to a $2.2 million increase in compensation and benefits expenses, in part attributable to higher incentive compensation. Technology and communications expenses increased to $4.0 million from $3.4 million due to increased network and capacity costs for our trading system. Professional fees decreased to $1.6 million from $1.9 million due to lower legal fees. Marketing and business development expenses decreased to $1.0 million from $1.1 million due to the timing of marketing programs. Depreciation and amortization increased to $1.8 million from $1.5 million due to higher amortization expense of the assets of Longitude, which was acquired in March 2006.

Income, Margins and Taxes

Pre-tax income for the fourth quarter of 2006 increased to $26.6 million versus $18.7 million last year. Interest and investment income increased to $2.9 million from $1.4 million primarily due to interest income from higher cash balances.

Our pre-tax margin for the fourth quarter increased to a record 55.8% from 50.1% last year.

Our tax rate decreased to 43.3% from 46.8% in the fourth quarter of 2005 due to higher levels of non-deductible expenses in the previous year's quarter and lower state and local taxes in the current quarter.

Net income for the fourth quarter increased 51.3% to $15.1 million from $10.0 million in the prior year quarter.

Full Year Results

For the year, average daily volume of equity and index options increased to 2.4 million contracts traded as compared to 1.8 million equity and index options contracts traded in the prior year. Revenues increased to $202.1 million from $155.9 million. Gross margin increased to $178.7 million from $137.0 million. Net income increased to $55.2 million from $35.3 million last year. Earnings per share on a fully diluted basis were $1.38 as compared to $0.93 last year. Excluding our indirect expenses, proforma net income increased to $56.7 million from $36.6 million last year. Proforma earnings per share on a fully diluted basis were $1.42 as compared to $0.96 last year.

Balance Sheet

As of December 31, 2006, ISE had cash and cash equivalents and investments in securities of $292.8 million, total assets of $396.4 million, and stockholders' equity of $258.3 million. The Company recorded minority interest of $36.3 million as of December 31, 2006, which represents interests of minority shareholders in the Company's subsidiary. Included in cash and cash equivalents is $37.8 million, from ISE Stock Exchange which is reserved for its use. There were approximately 38.0 million shares of common stock outstanding.


    Fourth Quarter Business Highlights

    --  ISE was the largest equity options exchange for the fourth
        quarter of 2006 based on total equity options trading.

    --  On October 5, 2006, ISE began trading options on the KBW Bank
        Index (Ticker: BKX). Timber Hill LLC serves as the Primary
        Market Maker.

    --  On October 10, 2006, ISE launched options trading on the
        ISE-REVERE Natural Gas Index(TM) (Ticker: FUM), a new sector
        benchmark for this growing industry. Timber Hill LLC serves as
        the Primary Market Maker.

    --  On October 16, 2006, ISE launched trading in its Second
        Market. As of December 31, 2006, 510 symbols were traded in
        the Second Market. When fully rolled out, members will have
        access to equity options that represent approximately 99% of
        industry volume through the ISE platform.

    --  On October 18, 2006, ISE launched ISEE Select(TM), its
        customized sentiment data offering. Through an intuitive
        browser application, ISEE Select enables subscribers to
        identify investor sentiment for individual securities or
        select industry sectors based on a unique calculation
        methodology that uses proprietary ISE opening customer trade
        data.

    --  On November 2, 2006, ISE announced that it filed a complaint
        in the United States District Court for the Southern District
        of New York seeking to end the exclusive listing of certain
        index options. ISE has asked the District Court to issue a
        declaratory judgment holding that ISE does not need a license
        to list index options on the Dow Jones Industrial Average
        (Ticker: DJX) and S&P 500 Index (Ticker: SPX). Currently,
        these two actively-traded index options trade exclusively on
        the Chicago Board Options Exchange (CBOE) pursuant to
        licensing agreements between CBOE and Dow Jones & Company (Dow
        Jones), the provider of the Dow Jones Industrial Average, and
        The McGraw-Hill Companies, Inc. (McGraw Hill), the provider of
        the S&P 500 Index. Thereafter, on November 15, 2006, Dow
        Jones, McGraw Hill and CBOE filed a complaint against the ISE
        and The Options Clearing Corporation (OCC) in Illinois state
        court seeking to enjoin ISE from trading, and OCC from
        issuing, clearing and settling any ISE trades in the DJX and
        SPX. ISE removed that case to the Federal District Court for
        the Northern District of Illinois.

    --  On November 9, 2006, ISE declared a quarterly dividend of
        $0.05 per outstanding share of its Class A Common Stock,
        payable on December 29, 2006 to holders of record as of the
        close of business on December 22, 2006.

    --  On November 20, 2006, ISE began disseminating the underlying
        rates for ISE FX Options(TM), its foreign currency options
        product scheduled for launch in 2007, pending regulatory
        approval. Rates are now available for the four currency pairs
        that ISE will initially list: USD/EUR (Symbol: EUI), USD/GBP
        (Symbol: BPX), USD/JPY (Symbol: YUK), and USD/CAD (Symbol:
        CDD).

    --  On December 8, 2006, the ISE Stock Exchange successfully
        launched its fully-displayed stock market. With the launch of
        the fully-displayed market, the ISE Stock Exchange now offers
        the only fully-electronic dual structure that provides
        integrated access to both displayed and non-displayed
        liquidity pools.

    --  On December 19, 2006, ISE announced the launch of the
        ISE-Revere Wal-Mart Supplier Index (Ticker: WMX) in
        collaboration with Revere Data LLC. This unique,
        relationship-based index allows investors to track the overall
        price performance of companies that derive a significant
        portion of their revenues from supplying Wal-Mart Stores Inc.,
        the world's leading retailer.

           INTERNATIONAL SECURITIES EXCHANGE HOLDINGS, INC.
                  CONSOLIDATED STATEMENTS OF INCOME
               (in thousands, except per share amounts)


                           Three Months Ended         Year Ended
                              December 31,           December 31,
                            2006        2005        2006       2005
                         ----------- ----------- ----------- ---------
                         (unaudited) (unaudited) (unaudited)
Revenues:
Transaction fees            $40,925     $33,689    $157,252  $116,121
Member fees and other         7,467       5,634      26,365    21,739
Market data                   4,957       4,260      18,464    18,039
                         ----------- ----------- ----------- ---------
  Total revenues             53,349      43,583     202,081   155,899

Cost of revenues:
Activity remittance fees      4,549       4,837      16,125    14,075
License fees                  1,207       1,362       7,259     4,816
                         ----------- ----------- ----------- ---------
Total cost of revenues        5,756       6,199      23,384    18,891

Gross margin                 47,593      37,384     178,697   137,008

Expenses:
Compensation and benefits    11,293       9,141      46,001    36,567
Technology and
 communications               4,008       3,412      15,405    13,648
Occupancy                     1,257       1,164       5,244     4,492
Professional fees             1,558       1,908       6,061     5,984
Marketing and business
 development                  1,010       1,113       3,199     3,949
Depreciation and
 amortization                 1,762       1,489       6,845     6,017
Other                         1,135       1,211       4,798     4,043
                         ----------- ----------- ----------- ---------
  Total direct expenses      22,023      19,438      87,553    74,700

Recovery of legal fees       (1,210)          -      (1,210)        -
Billing reimbursement         3,297           -       3,297         -
Reorganization                    -          34         326       339
Offering costs                    -         569           -       902
                         ----------- ----------- ----------- ---------
  Total expenses             24,110      20,041      89,966    75,941
                         ----------- ----------- ----------- ---------

Operating income             23,483      17,343      88,731    61,067

Interest and investment
 income                       2,934       1,395       8,361     4,063
Minority interest               155           -         650         -
                         ----------- ----------- ----------- ---------
Income before provision
 for income taxes            26,572      18,738      97,742    65,130

Provision for income
 taxes                       11,499       8,778      42,590    29,783
                         ----------- ----------- ----------- ---------
Net income                  $15,073      $9,960     $55,152   $35,347
                         =========== =========== =========== =========

Earnings per share:
  Basic                       $0.40       $0.27       $1.47     $0.99
  Diluted                     $0.38       $0.26       $1.38     $0.93

Weighted average number
 of shares outstanding:
  Basic                      37,895      36,803      37,479    35,849
  Diluted                    40,049      38,976      39,893    37,947
           INTERNATIONAL SECURITIES EXCHANGE HOLDINGS, INC.
            CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION
                            (in thousands)

                                            December 31,  December 31,
                                                2006          2005
                                            --------------------------
                                            (unaudited)
ASSETS
Current assets:
  Cash and cash equivalents                    $200,015      $170,927
       (including $37,767 reserved for ISE
        Stock Exchange as of December 31,
        2006)
  Accounts receivable, net                       34,815        35,048
  Income tax receivable                           9,644             -
  Securities owned                               60,090         9,890
  Other current assets                            2,415         2,745
                                            ------------  ------------
      Total current assets                      306,979       218,610

Securities owned                                 32,724         7,244
Accounts receivable                                   -           587
Fixed assets, net                                29,009        29,205
Deferred tax asset, net                          21,932        22,333
Other assets                                      5,781         2,517
                                            ------------  ------------
      Total assets                              396,425       280,496
                                            ============  ============

LIABILITIES, MINORITY INTEREST AND
 STOCKHOLDERS' EQUITY
LIABILITIES
Current liabilities:
  Accounts payable and accrued expenses          19,430        15,406
  Compensation and benefits payable              12,453         8,371
  Deferred revenue                                5,129         4,687
  Income tax payable                                  -           372
  Payment for order flow payable                 10,262        12,233
                                            ------------  ------------
      Total current liabilities                  47,274        41,069

Deferred revenue                                 50,954        50,238
Other liabilities                                 3,609         4,211
                                            --------------------------
      Total liabilities                         101,837        95,518

Minority interest                                36,323             -

                                            ------------  ------------
STOCKHOLDERS' EQUITY                            258,265       184,978
                                            ------------  ------------


                                            ------------  ------------
      Total liabilities, minority interest
       and stockholders' equity                $396,425      $280,496
                                            ============  ============
           INTERNATIONAL SECURITIES EXCHANGE HOLDINGS, INC.
                CONSOLIDATED STATEMENTS OF CASH FLOWS
                            (In thousands)


                                                      Year Ended
                                                     December 31,
                                                    2006       2005
                                                 ----------- ---------
                                                 (unaudited)
Cash flows from operating activities:
Net income                                          $55,152   $35,347
Adjustments to reconcile net income to cash
 provided by/(used in) operating activities:
   Depreciation and amortization                      6,661     6,017
   Asset impairment                                     184         -
   Stock based compensation                           8,056     4,825
   Deferred taxes                                       401    (6,498)
   Unrealized (gain)/loss on securities owned
    and available for sale securities, net             (401)     (357)
Excess tax benefits from share-based payment
 arrangements                                       (19,207)   (4,011)

(Increase)/decrease in operating assets:
   Accounts receivable, net                             820       578
   Income tax receivable                              9,563    11,332
   Securities owned                                   4,143     5,398
   Other assets                                         321     4,084
Increase/(decrease) in operating liabilities:
   Accounts payable and accrued expenses              4,024     6,972
   Compensation and benefits payable                  4,082    (6,149)
Income tax payable                                     (372)    4,383
   Deferred revenue                                   1,158       (34)
   Payment for order flow payable                    (1,971)   (1,025)
   Other liabilities                                   (602)     (738)
                                                 ----------- ---------
    Net cash provided by operating activities        72,012    60,124
                                                 ----------- ---------

Cash flows from investing activities:
Purchase of fixed assets                             (6,234)   (2,395)
Purchase of intangible assets                        (2,910)        -
Purchase of available for sale securities           (94,305)        -
Maturities of available for sale securities          14,908     4,990
                                                 ----------- ---------
    Net cash (used in)/provided by investing
     activities                                     (88,541)    2,595
                                                 ----------- ---------

Cash flows from financing activities:
Dividend                                             (7,635)  (11,784)
Net proceeds from initial public offering                 -    70,739
Net contribution from minority shareholders          35,563         -
Proceeds from options exercised                       1,484       395
Share repurchase                                     (3,002)        -
Excess tax benefits from share-based payment
 arrangements                                        19,207     4,011
                                                 ----------- ---------
       Net cash provided by/(used in) financing
        activities                                   45,617    63,361
                                                 ----------- ---------

Increase in cash and cash equivalents                29,088   126,080
Cash and cash equivalents, beginning of period      170,927    44,847
                                                 ----------- ---------
Cash and cash equivalents, end of period           $200,015  $170,927
                                                 =========== =========
           INTERNATIONAL SECURITIES EXCHANGE HOLDINGS, INC.
                     KEY STATISTICAL INFORMATION

                                Three Months Ended     Year Ended
                                   December 31,       December 31,
                                 2006      2005      2006      2005
                                --------  -------- ---------- --------
Trading Days                         63        63        251      252
-------------------------------------------------- -------------------
Average daily trading volume
 (1) (2)
Equity and Index Options
-------------------------------
Total U.S. industry equity and
 index options traded (in
 thousands)                       8,669     7,006      8,078    5,969
Our equity and index options
 traded (in thousands)            2,415     2,059      2,359    1,781
Our market share of equity and
 index options traded              27.9%     29.4%      29.2%    29.8%
Equity Options
-------------------------------
Total U.S. industry equity
 options traded (in thousands)    7,910     6,387      7,347    5,433
Our equity options traded (in
 thousands)                       2,381     2,035      2,326    1,763
Our market share of equity
 options traded                    30.1%     31.9%      31.7%    32.4%
Index Options
-------------------------------
Total U.S. industry index
 options traded (in thousands)      759       619        731      536
Our index options traded (in
 thousands)                          34        24         33       18
Our market share of index
 options traded                     4.5%      3.9%       4.5%     3.4%
-------------------------------------------------- -------------------
Our member total trading volume
 (sides, in thousands): (3)
Account type:
Customer                        123,094   105,679    487,310  370,772
Firm proprietary                 39,991    25,579    148,990   84,288
Market maker                    141,257   128,142    547,623  442,332
                                --------  -------- ---------- --------
Total Sides                     304,342   259,400  1,183,923  897,392
-------------------------------------------------- -------------------
Our market share of total
 industry trading: (4)
Customer                           29.6%     30.7%      30.0%    30.3%
Firm proprietary                   23.1%     22.7%      25.0%    22.0%
Market maker                       28.1%     30.1%      29.8%    31.5%
-------------------------------------------------- -------------------
Revenue:
Average transaction fee per
 side (5)                        $0.134    $0.130     $0.133   $0.129
Average cost of transaction fee
 per side (6)                   ($0.019)  ($0.024)   ($0.020) ($0.021)
                                --------  -------- ---------- --------
Average net transaction fee per
 side (6)                        $0.116    $0.106     $0.113   $0.108
Average transaction fee per
 revenue side (7)                $0.175    $0.171     $0.176   $0.178
-------------------------------------------------- -------------------
Our trades:(8)
Average contracts per trade        17.6      18.1       17.6     17.8
Average trades per day (in
 thousands)                       136.5     114.0      133.9    100.3
Total trades (in thousands)       8,602     7,183     33,601   25,269
Our market share of industry
 trade volume                      33.2%     32.7%      32.6%    33.8%
-------------------------------------------------- -------------------
Our listed issues: (9)
Average number of issues traded
 during the period                1,203       795        968      743
-------------------------------------------------- -------------------
Our Members (average number
 trading during period)
PMMs                                 10        10         10       10
CMMs                                149       138        146      136
EAMs                                104        97        102       95
                                --------  -------- ---------- --------
Total                               263       245        258      241
-------------------------------------------------- -------------------
Employees (period average)
Full-time equivalent (10)           179       185        180      185
-------------------------------------------------- -------------------

(1) Represents single counted contract volume. For example, a
 transaction of 500 contracts on our exchange is counted as a single
 500 contract transaction for purposes of calculating our volumes,
 even though we may receive transaction fees from parties on both
 sides of the transaction, one side of a transaction, or in some
 cases, neither side of a transaction.

(2) Our market share is calculated based on the number of contracts
 executed on our exchange as a percentage of total industry contract
 volume.

(3) Represents each side of a buy or sell transaction. For example, a
 transaction of 500 contracts on our exchange is counted as two sides
 of 500 contracts, representing a buy and a sell transaction. We
 generally do not charge our members for executing non-broker-dealer
 customer orders on our exchange except for options on our premium
 products as well as options for listings in our Second Market.

(4) Represents our market share of total U.S. industry equity and
 index trading for members trading on our exchange based on contract
 trading volume.

(5) Average transaction fee per side is calculated by dividing our
 transaction fees by the total number of sides executed on our
 exchange. We generally do not charge our members for executing non-
 broker-dealer customer orders on our exchange except for options on
 our premium products as well as options for listings in our Second
 Market. Comparing our average transaction fee per side to our average
 transaction fee per revenue side reflects the negative effect of our
 fee waivers or reductions on our revenues, on a per side basis. For
 the three months ended December 31, 2006 and 2005, we have waived and
 discounted $8,100 and $7,767 of our fees, respectively. For the year
 ended December 31, 2006 and 2005, we have waived and discounted
 $33,613 and $27,502 of our fees, respectively.

(6) Average cost of transaction fee per side is calculated by
 subtracting cost of revenues from transaction fees, which we refer to
 as net transaction fees, and dividing the result by the total number
 of sides executed on our exchange.

(7) Our average transaction fee per revenue side reflects the
 transaction fee we charge to our market participants per our publicly
 available pricing schedules. These schedules were part of rule
 proposals that became effective upon filing pursuant to Section
 19(b)(3)(A) of the Securities Exchange Act of 1934, as amended (the
 "Exchange Act"). The Securities and Exchange Commission may abrogate
 such rule proposals within 60 days of filing if it determines that
 such action is necessary or appropriate in the public interest, for
 the protection of investors or otherwise in furtherance of the
 purposes of the Exchange Act.

(8) Members can have several contracts per trade. Trades represent the
 number of trades cleared through The Option Clearing Corporation, or
 the OCC. Market data revenue is generated on a per trade basis, not
 on a contract basis.

(9) By "issues" we mean the number of securities underlying our
 options. We trade multiple options series on each underlying
 security.

(10) Excludes full-time equivalent employees of ISE Stock Exchange,
 LLC, beginning April 2006.

In an effort to provide additional information regarding our results as determined by GAAP, we also disclose certain non-GAAP information which we believe provides useful and meaningful information. Our management reviews this non-GAAP financial measurement when evaluating our financial performance and results of operations; therefore, we believe it is useful to provide information with respect to these non-GAAP measurements so as to share this perspective of management. Non-GAAP measurements do not have any standardized meaning and are therefore unlikely to be comparable to similar measures presented by other companies. These non-GAAP financial measures should be considered in the context with our GAAP results.

We have disclosed financial measures that reference our net transaction fees, which we define as our transaction fees excluding activity remittance fees and license fees. Under GAAP, activity remittance fees and ETF and index license fees are required to be recorded on a gross basis. Since activity remittance fees and ETF and index license fees are entirely offset by corresponding amounts in transaction fees, management believes that presenting net transaction fees provides a clearer measure of our transaction related performance. In addition, we have also disclosed financial measures excluding certain charges or adjustments related to a recovery of legal fees associated with our successful litigation to trade options on SPDRs without a license, reimbursements to members due to an error in our billing system, costs related to our reorganization into a holding company structure and expenses associated with our initial and secondary offerings. Management excludes these items when evaluating the Company's financial performance as they believe these items do not directly relate to the costs of running its business or they do not directly relate to the current period presented as evaluated by management as opposed to accounting standards prescribed under GAAP.

           INTERNATIONAL SECURITIES EXCHANGE HOLDINGS, INC.
                   GAAP TO NON GAAP RECONCILIATION
               (in thousands, except per share amounts)
                             (unaudited)

                                Three Months Ended     Year Ended
                                   December 31,       December 31,
                                  2006     2005      2006      2005
                                --------- -------- --------- ---------

GAAP Transaction fees, as
 reported                        $40,925  $33,689  $157,252  $116,121
Less activity remittance fees      4,549    4,837    16,125    14,075
Less license fees                  1,207    1,362     7,259     4,816
                                --------- -------- --------- ---------
Net transaction fees, proforma   $35,169  $27,490  $133,868   $97,230
                                --------- -------- --------- ---------


GAAP Income before provision for
 income taxes, as reported       $26,572  $18,738   $97,742   $65,130
Less Recovery of legal fees       (1,210)       -    (1,210)        -
Less Billing reimbursement         3,297        -     3,297         -
Less Reorganization                    -       34       326       339
Less Offering costs                    -      569         -       902
                                --------- -------- --------- ---------
Income before provision for
 income taxes, proforma          $28,659  $19,341  $100,155   $66,371
                                --------- -------- --------- ---------


GAAP Net income, as reported     $15,073   $9,960   $55,152   $35,347
Less Recovery of legal fees, net
 of tax                             (683)       -      (683)        -
Less Billing reimbursement, net
 of tax                            1,861        -     1,861         -
Less Reorganization, net of tax        -       34       326       339
Less Offering costs, net of tax        -      569         -       902
                                ------------------ --------- ---------
Net income, proforma             $16,251  $10,563   $56,656   $36,588
                                ------------------ --------- ---------


GAAP Diluted earnings per share,
 as reported                       $0.38    $0.26     $1.38     $0.93
Less Recovery of legal fees, net
 of tax                            (0.02)       -     (0.02)        -
Less Billing adjustment, net of
 tax                                0.05        -      0.05         -
Less Reorganization, net of tax        -     0.00      0.01      0.01
Less Offering costs, net of tax        -     0.01         -      0.02
                                --------- -------- --------- ---------
Diluted earnings per share,
 proforma                          $0.41    $0.27     $1.42     $0.96
                                --------- -------- --------- ---------


Gross Margin                      47,593   37,384   178,697   137,008

GAAP pre-tax margins, as
 reported                           55.8%    50.1%     54.7%     47.5%
Pre-tax margins, proforma           60.2%    51.7%     56.0%     48.4%

Earnings Conference Call

ISE will host a conference call to discuss its fourth quarter 2006 results at 8:30 a.m. Eastern Time today. The conference call will be web cast and can be accessed on the Investor Relations section of ISE's web site at www.iseoptions.com. An investor presentation that will be referenced during the call will be posted to the web site. Investors can also listen to the conference call by calling (866) 362-4832 and dialing the participant passcode 52799934. An archived recording of the call will be available from 10:30 a.m. on February 6, 2007 until midnight on February 7, 2007 and can be accessed by calling (888) 286-8010 and dialing the participant passcode 84397432. 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

International Securities Exchange Holdings, Inc. (NYSE: ISE), through its subsidiaries, operates a family of innovative securities markets. ISE is founded on the principle that technology and competition create better, more efficient markets for investors and consists of an options exchange, a stock exchange and an alternative markets platform. ISE continually enhances its trading systems and develops new products to provide investors with the best marketplace and investment tools to trade smarter.

ISE developed a unique market structure for advanced screen-based trading systems and in May 2000 launched the first fully-electronic U.S. options exchange. Currently, ISE operates the largest U.S. equity options exchange and is among the leading options exchanges in the world. ISE offers index options, including a portfolio of proprietary index products, and enhanced market data products for sophisticated investors. ISE FX Options(TM) are slated to launch in 2007.

ISE Stock Exchange, launched in September 2006 with strategic partners, includes an innovative MidPoint Match(TM) platform which offers investors continuous price improvement. MidPoint Match was integrated with a fully-displayed Best Bid Offer market in December 2006.

ISE's alternative markets business currently consists of an events market trading platform known as Longitude. Longitude's patented and proprietary technology provides a unique pari-mutuel structure for derivatives auctions which results in greater trading and pricing flexibility for market participants.

For more information about ISE and its options exchange, visit www.iseoptions.com and for more information about ISE Stock Exchange, visit www.isestock.com. Additionally, to learn more about ISE alternative markets technology, visit www.longitude.com.

Certain matters discussed in this press release are "forward looking statements" intended to qualify for the safe harbor from liability established by the Private Securities Litigation Reform Act of 1995. 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 annual report on Form 10-K, current reports on Form 8-K and quarterly reports on Form 10-Q.