Exhibit 99.1

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

The unaudited pro forma condensed combined financial statements combine the historical consolidated financial statements of IntercontinentalExchange, Inc. (“ICE”) and NYSE Euronext, giving effect to the merger transactions pursuant to which ICE will acquire NYSE Euronext under a newly formed holding company, IntercontinentalExchange Group, Inc. (“ICE Group”), which is referred to as the “mergers”. The unaudited pro forma condensed combined statements of income for the six months ended June 30, 2013 and for the year ended December 31, 2012 combine the historical consolidated statements of income of ICE and the historical consolidated statements of operations of NYSE Euronext, giving effect to the mergers as if they had been consummated on January 1, 2012, the beginning of the earliest period presented. The unaudited pro forma condensed combined balance sheet combines the historical condensed consolidated balance sheet of ICE and the historical condensed consolidated balance sheet of NYSE Euronext as of June 30, 2013, giving effect to the mergers as if they had been consummated on June 30, 2013. The historical consolidated financial statements of NYSE Euronext have been adjusted to reflect certain reclassifications in order to conform to ICE’s financial statement presentation.

The unaudited pro forma condensed combined financial statements have been prepared using the acquisition method of accounting in accordance with U.S. generally accepted accounting principles (“US GAAP”) with ICE considered the acquirer of NYSE Euronext for accounting purposes. Under the acquisition method of accounting, the purchase price is allocated to the underlying NYSE Euronext tangible and intangible assets acquired and liabilities assumed based on their respective fair market values with any excess purchase price allocated to goodwill.

ICE has not completed the detailed valuation studies necessary to arrive at the required estimates of the fair value of the NYSE Euronext assets to be acquired and the liabilities to be assumed and the related allocations of purchase price, nor has it identified all adjustments necessary to conform NYSE Euronext’s accounting policies to ICE’s accounting policies. A final determination of the fair value of NYSE Euronext’s assets and liabilities, including intangible assets with both indefinite or finite lives, will be based on the actual net tangible and intangible assets and liabilities of NYSE Euronext that exist as of the closing date of the mergers and, therefore, cannot be made prior to the completion of the transaction. In addition, the value of the consideration to be paid by ICE upon the consummation of the mergers will be determined based on the closing price of ICE’s common stock on the closing date of the mergers. As a result of the foregoing, the pro forma adjustments are preliminary and are subject to change as additional information becomes available and as additional analyses are performed. The preliminary pro forma adjustments have been made solely for the purpose of providing the unaudited pro forma condensed combined financial statements presented below. ICE has estimated the fair value of NYSE Euronext’s assets and liabilities based on discussions with NYSE Euronext’s management, preliminary valuation studies, due diligence and information presented in NYSE Euronext’s public filings. Until the mergers are completed, both companies are limited in their ability to share certain information. After completion of the mergers, the valuations will be finalized as soon as practicable within the required measurement period, but in no event later than one year following completion of the mergers. Any increases or decreases in the fair value of relevant balance sheet amounts upon completion of the final valuations will result in adjustments to the pro forma balance sheet and/or statements of income. The final purchase price allocation may be different than that reflected in the pro forma purchase price allocation presented herein, and this difference may be material.

The aggregate purchase price for financial statement purposes will be based on the actual closing price per share of ICE common stock on the closing date, which could differ materially from the assumed value disclosed in the notes to the unaudited pro forma condensed combined financial statements. If the actual closing price per share of ICE common stock on the closing date is higher than the assumed amount, it is expected that the actual amount recorded for goodwill will be higher; conversely, if the actual closing price is lower, the actual amount recorded for goodwill will be lower. A hypothetical 10% change in ICE’s closing stock price on the closing date of the mergers would have an approximate $764 million impact on the purchase price and subsequent goodwill balance.

Assumptions and estimates underlying the unaudited adjustments to the pro forma condensed combined financial statements (the “pro forma adjustments”) are described in the accompanying notes. The historical consolidated financial statements have been adjusted in the pro forma condensed combined financial statements to give effect to pro forma events that are: (1) directly attributable to the mergers; (2) factually supportable; and (3) with respect to the pro forma statements of income, expected to have a continuing impact on the combined results of ICE and NYSE Euronext following the mergers. The unaudited pro forma condensed combined financial statements have been presented for illustrative purposes only and are not necessarily indicative of the operating results and financial

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position that would have been achieved had the mergers occurred on the dates indicated. Further, the unaudited pro forma condensed combined financial statements do not purport to project the future operating results or financial position of the combined company following the mergers.

The unaudited pro forma condensed combined financial statements, although helpful in illustrating the financial characteristics of the combined company under one set of assumptions, do not reflect the benefits of expected cost savings (or associated costs to achieve such savings), opportunities to earn additional revenue, or other factors that may result as a consequence of the mergers and, accordingly, do not attempt to predict or suggest future results. Specifically, the unaudited pro forma condensed combined statements of income exclude projected operating efficiencies and synergies expected to be achieved as a result of the mergers. The projected operating synergies include approximately $450 million in combined annual cost synergies expected to be realized within three years of closing the mergers (inclusive of $150 million related to NYSE Euronext’s current cost savings program, known as Project 14). Of these expense synergies, 80% are expected to be realized within two years of closing. The unaudited pro forma condensed combined financial statements also exclude the effects of costs associated with any restructuring or integration activities or asset dispositions resulting from the mergers, as they are currently not known, and to the extent they occur, are expected to be non-recurring and will not have been incurred at the closing date of the mergers. However, such costs could affect the combined company following the mergers in the period the costs are incurred or recorded. Further, the unaudited pro forma condensed combined financial statements do not reflect the effect of any regulatory actions that may impact the results of the combined company following the mergers.

The unaudited pro forma condensed combined financial statements have been developed from and should be read in conjunction with:

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INTERCONTINENTALEXCHANGE, INC. AND NYSE EURONEXT

UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME

FOR THE SIX MONTHS ENDED JUNE 30, 2013

(In thousands, except per share amounts)

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INTERCONTINENTALEXCHANGE, INC. AND NYSE EURONEXT

UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME

FOR THE YEAR ENDED DECEMBER 31, 2012

(In thousands, except per share amounts)

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INTERCONTINENTALEXCHANGE, INC. AND NYSE EURONEXT

UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET

AS OF JUNE 30, 2013

(In thousands)

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NOTES TO THE UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

1. Basis of Pro Forma Presentation

Overview

Pursuant to the merger agreement, dated December 20, 2012, as amended and restated on March 13, 2013, ICE agreed to acquire NYSE Euronext under a newly formed holding company, ICE Group. Following successive merger transactions, ICE and NYSE Euronext will become wholly-owned subsidiaries of ICE Group. For purposes of the unaudited pro forma condensed combined financial statements (the “pro forma financial statements”), ICE has assumed a total preliminary purchase price for the mergers of $10.4 billion, which consists of cash, shares of ICE Group common stock, and replacement share-based payment awards. Under the terms of the merger agreement, the transaction is currently valued at $42.09 per NYSE Euronext share, based on the closing price of ICE’s stock on September 5, 2013. Each issued and outstanding share of NYSE Euronext common stock (except for excluded shares and dissenting shares) will be converted into the right to receive 0.1703 of a share of ICE Group common stock and $11.27 in cash (this is referred to as the “standard election amount”). NYSE Euronext stockholders will also have the right to make either a cash election to receive $33.12 in cash, or a stock election to receive 0.2581 of a share of ICE Group common stock, for their NYSE Euronext shares. Both the cash election and the stock election are subject to the proration and adjustment procedures to ensure that the total amount of cash paid, and the total number of shares of ICE Group common stock issued, in the mergers to the NYSE Euronext stockholders, as a whole, will be equal to the total amount of cash and number of shares that would have been paid and issued if all of the NYSE Euronext stockholders received the standard election amount, representing maximum cash consideration of $2.7 billion and a maximum aggregate number of ICE Group common shares of 42.4 million shares. NYSE Euronext stockholders who make no election will receive the standard election amount. The overall mix of the $10.4 billion of estimated aggregate merger consideration being paid by ICE and ICE Group is approximately 74% shares and 26% cash.

The pro forma financial statements have been prepared assuming the mergers are accounted for using the acquisition method of accounting under US GAAP with ICE treated as the acquiring entity for accounting purposes. Accordingly, under acquisition accounting, the total estimated purchase price is allocated to the acquired net tangible and identifiable intangible assets of NYSE Euronext based on their respective fair values, as further described below.

To the extent identified, certain reclassifications have been reflected in the pro forma adjustments to conform NYSE Euronext’s financial statement presentation to that of ICE, as described in Note 2. However, the pro forma financial statements may not reflect all adjustments necessary to conform the accounting policies of NYSE Euronext to those of ICE due to limitations on the availability of information as of the date of these pro forma financial statements.

The pro forma adjustments represent management’s estimates based on information available as of the date of these pro forma financial statements and are subject to change as additional information becomes available and additional analyses are performed. The pro forma financial statements do not reflect the impact of possible revenue or earnings enhancements, cost savings from operating efficiencies or synergies, or asset dispositions. Also, the pro forma financial statements do not reflect possible adjustments related to restructuring or integration activities that have yet to be determined or transaction or other costs following the mergers that are not expected to have a continuing impact. Further, one-time transaction-related expenses anticipated to be incurred prior to, or concurrent with, the closing of the mergers are not included in the pro forma statements of income. However, the impact of such transaction expenses are reflected in the pro forma balance sheet as decreases to retained earnings and cash.

The pro forma statements of income for the six months ended June 30, 2013 and for the year ended December 31, 2012 combine the historical consolidated statements of income of ICE and the historical consolidated statements of operations of NYSE Euronext, giving effect to the mergers as if they had been consummated on January 1, 2012, the beginning of the earliest period presented. The pro forma balance sheet combines the historical consolidated balance sheet of ICE and the historical consolidated balance sheet of NYSE Euronext as of June 30, 2013, giving effect to the mergers as if they had been consummated on June 30, 2013.

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Completion of the mergers is subject to regulatory approvals from the Euronext College of Regulators and other national financial regulators, as well as customary closing conditions. The mergers are expected to be completed during the fall of 2013.

Preliminary Estimated Purchase Price

The total preliminary estimated purchase price of $10.4 billion was determined based on NYSE Euronext’s shares of common stock and awards outstanding under NYSE Euronext’s stock plan (which we refer to as equity awards), as of September 5, 2013. For purposes of these pro forma financial statements, such common stock and equity awards are assumed to remain outstanding as of the closing date of the mergers. Further, no effect has been given to any other new shares of common stock or other equity awards that may be issued or granted subsequent to the date of these pro forma financial statements and before the closing date of the mergers. In all cases in which ICE’s closing stock price is a determining factor in arriving at the final merger consideration, the stock price assumed for the total preliminary purchase price is the closing price of ICE’s common stock on September 5, 2013 ($181.00 per share), the most recent date practicable in the preparation of these pro forma financial statements. The standard election amount is assumed for purposes of preparing the table below.

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The purchase price will be computed using the closing price of ICE common stock on the closing date; therefore, the actual purchase price will fluctuate with the market price of ICE common stock until the mergers are consummated. As a result, the final purchase price could differ significantly from the current estimate, which could materially impact the pro forma financial statements.

The following table presents the changes to the value of stock consideration and the total preliminary purchase price based on a 10% increase and decrease in the per share price of ICE common stock (in thousands, except per share data):

Preliminary Estimated Purchase Price Allocation

The total preliminary estimated purchase price described above has been allocated to NYSE Euronext’s tangible and intangible assets and liabilities for purposes of these pro forma financial statements based on their estimated relative fair values assuming the mergers were completed on the pro forma balance sheet date presented. The final allocation will be based upon valuations and other analyses for which there is currently insufficient information to make a definitive allocation. Accordingly, the purchase price allocation adjustments are preliminary and have been made

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solely for the purpose of providing pro forma financial statements. The final purchase price allocation will be determined after the mergers are consummated and after completion of a thorough analysis to determine the fair value of NYSE Euronext’s tangible assets and liabilities, including fixed assets and investments, and identifiable intangible assets and liabilities. As a result, the final acquisition accounting adjustments, including those resulting from conforming NYSE Euronext’s accounting policies to those of ICE, could differ materially from the pro forma adjustments presented herein. Any increase or decrease in the fair value of NYSE Euronext’s tangible and identifiable intangible assets and liabilities, as compared to the information shown herein, would also change the portion of purchase price allocable to goodwill and could impact the operating results of the combined company following the mergers due to differences in amortization related to these assets and liabilities. The total preliminary estimated purchase price was allocated based on NYSE Euronext’s balance sheet as of June 30, 2013 as follows (in thousands):

Preliminary identifiable intangible assets in the pro forma financial statements consist of anticipated intangibles derived from national securities exchange registrations, customer relationships and trade names, of which customer relationships and certain trade names are amortizable. The amortization related to these amortizable identifiable intangible assets is reflected as a pro forma adjustment to the pro forma statements of income using the straight-line method. Management has determined the estimated remaining useful life of these assets based on its consideration of relevant factors. An indefinite remaining useful life for national securities exchange registrations has been estimated since the registrations represent rights to operate exchanges in perpetuity based on the long history of the NYSE Euronext exchanges to be acquired and the expectation that a market participant would continue to operate them indefinitely. Indefinite remaining useful lives for the NYSE and Euronext trade names have been estimated based on their long history in the marketplace, their continued use following the mergers, and their importance to the business of NYSE Euronext and prominence in the industry. A three year remaining useful life for the Liffe trade name has been estimated based on the period in which ICE expects a market participant would use the name prior to rebranding and the length of time the name is expected to maintain recognition and value in the marketplace. An

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average 21 year remaining useful life for customer relationships has been estimated based on the projected economic benefits associated with this asset. The 21 year estimated useful life represents the approximate point in the projection period in which a majority of the asset’s cash flows are expected to be realized based on assumed attrition rates. These assumptions have been based on discussions with NYSE Euronext management due to the limits on each company’s ability to share certain information, which includes access to NYSE Euronext’s historical customer data.

The identifiable intangible assets and related amortization are preliminary and have been based on discussions with NYSE Euronext’s management, preliminary valuation studies, due diligence and information presented in public filings. As discussed above, the amount that will ultimately be allocated to identifiable intangible assets and liabilities, and the related amount of amortization, may differ materially from this preliminary allocation. In addition, the periods impacted by amortization expense will ultimately be based upon the periods in which we expect to derive the associated economic benefits or detriments. Therefore, the amount of amortization expense following the mergers may differ significantly between periods based upon the final value assigned to, and amortization methodology used for, each identifiable intangible. Intangible amortization has been presented in one line item on the pro forma statements of income; however, the ultimate classification of intangible amortization expense could differ materially, depending upon the final determination of the nature and amount of each identifiable intangible asset and liability.

The deferred tax liabilities above represent the estimated tax effect on the identifiable intangibles as there will be no tax basis in these assets. This determination is preliminary and subject to change based upon the final determination of the fair value of the identifiable intangible assets.

Goodwill represents the excess of the preliminary estimated purchase price over the fair value of the underlying net assets. Goodwill is not amortized to earnings, but instead is reviewed for impairment at least annually, absent any indicators of impairment.

2. Pro Forma Adjustments

The unaudited pro forma condensed combined statements of income reflect the following adjustments:

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For purposes of the pro forma interest expense on the $1.8 billion of new debt to be incurred to fund a portion of the cash merger consideration, ICE has assumed an interest rate of 2.5% per annum. Borrowings under ICE’s revolving credit facility are expected to be refinanced following the mergers under a commercial paper program. Any borrowings by ICE Group through the issuance of senior notes or refinancing of borrowings under ICE’s revolving credit facility are subject to market conditions and other factors outside the control of ICE Group and ICE and there can be no assurance that ICE and ICE Group will be able to issue senior notes or refinance such borrowings. In addition, additional interest expense is recorded related to ICE’s outstanding term loans and unused commitment fee on ICE’s revolving credit facility based on a presumed higher rate of interest in accordance with the terms of the agreements and the associated changes in the leverage ratios. See Note 3 for more information on these financing transactions related to the mergers.

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The unaudited pro forma condensed combined balance sheet reflects the following adjustments:

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As part of these preliminary estimates, national securities exchange registrations and customer relationships were valued using the excess earnings approach and trade names were valued using the relief-from-royalty method under the income approach. Amortization expense was calculated using a straight-line method. See Note 1 for a discussion of the estimated remaining useful life for each intangible asset category identified above.

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3. Financing Considerations

The pro forma financial statements assume, as summarized in Note 1, that the preliminary estimated purchase price for the mergers is $10.4 billion, comprised of $7.6 billion in equity consideration (including the issuance of 42.4 million shares of ICE Group common stock in exchange for outstanding shares of NYSE Euronext common stock, restricted stock and stock options) and $2.7 billion in cash consideration. ICE expects to fund the cash portion of the purchase price by using $941.3 million from ICE’s existing unrestricted cash balances and anticipated borrowings of $1.8 billion.

ICE has an aggregate $2.1 billion five-year senior unsecured multicurrency revolving credit facility in place, of which $1.8 billion was available to be borrowed by ICE for general corporate purposes as of June 30, 2013. The ICE revolving credit facility matures on November 9, 2016. ICE management does not anticipate repatriating any undistributed earnings of non-U.S. subsidiaries to fund the cash portion of the NYSE Euronext merger consideration. Further, ICE expects its available U.S. cash and anticipated borrowings will be sufficient to fund the cash merger consideration at closing and ICE Group’s anticipated U.S. operating cash flow will be sufficient to fund ICE Group’s announced $300 million annual future dividend program it anticipates implementing following completion of the mergers. The declaration and payment of any dividends will be at the sole discretion of ICE Group’s board of directors.

The outstanding debt of the combined company in the pro forma balance sheet as of June 30, 2013 consists of (i) $1.8 billion in a combination of senior notes anticipated to be issued in one or more tranches by ICE Group and anticipated borrowings by ICE under its revolving credit facility to fund a portion of the cash merger consideration at an assumed interest rate of 2.5%, together with estimated unamortized debt issuance costs of $9.3 million, (ii) ICE’s term loan facility, which had $402.8 million outstanding with a 1.45% interest rate as of June 30, 2013, (iii) ICE’s senior notes, tranche A, which has $200.0 million outstanding with a 4.13% interest rate as of June 30, 2013, (iv) ICE’s senior notes, tranche B, which has $200.0 million outstanding with a 4.69% interest rate as of June 30, 2013, (v) NYSE Euronext’s European bonds, which have $1.2 billion outstanding with a 5.375% interest rate as of June 30, 2013 (plus an additional $104.2 million pro forma adjustment to record the debt to its fair value), and (vi) NYSE Euronext’s U.S. bonds (October 2017 maturity), which have $850.0 million outstanding with a 2.0% interest rate as of June 30, 2013 (plus an additional $6.1 million pro forma adjustment to record the debt to its fair value).

Subsequent to the closing of the mergers, ICE intends to refinance its anticipated borrowings under its revolving credit facility through the issuance of new debt, which ICE expects will be in the form of a commercial paper program. ICE does not currently expect the average interest rate on any issuance of debt securities combined with refinancing under a commercial paper program to be materially different from the interest rate available under ICE’s revolving credit facility at the time of issuance.

The pro forma financial statements reflect our estimate of the amount of financing required to complete the mergers. The actual amount of financing required for the mergers will not be determined until the closing date of the mergers when the actual purchase price, the actual amount of existing unrestricted cash balances of ICE, and the total value

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of ICE Group common stock to be issued are known. The actual amount of available cash at closing and the total value of common stock to be issued in the mergers to NYSE Euronext stockholders may vary materially from preliminary estimates. The pro forma financial statements also reflect an assumed interest rate for the $1.8 billion of varying forms of debt expected to be incurred based on current market conditions and rates as of the date of these pro forma financial statements and based on instruments and facilities with similar terms and tenors. However, the actual interests incurred on the debt may vary significantly based upon, among other factors outside our control, market conditions, the amount of each form of debt incurred, ICE Group’s ability to issue senior notes, ICE’s ability to borrow under its revolving credit facility to finance a portion of the cash merger consideration, and ICE’s ability to refinance its borrowing under its revolving credit facility with a commercial paper program in connection with the closing of the mergers. There can be no assurance that ICE Group and ICE will be able to issue senior notes (or on anticipated terms), incur indebtedness under ICE’s revolving credit facility or refinance any of its anticipated borrowings under the revolving credit facility. A 100 basis point increase or decrease in interest rates on the $1.8 billion new debt, compared to the rates used for determining interest expense in the pro forma statements of income, would have an approximate $18.3 million impact on our assumed annual interest expense.

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