NASDAQ OMX Group (NDAQ)

Critical Accounting Policies

The following provides information about our critical accounting policies. Critical accounting policies are defined as those that are reflective of significant judgments and uncertainties, and potentially result in materially different results under different assumptions and conditions. These policies relate to revenue recognition and cost of revenues, reserve for bad debts, valuation of goodwill and intangible assets, income taxes and software costs. For a summary of our significant accounting policies, including the accounting policies discussed below, see Note 2, “Summary of Significant Accounting Policies,” to the consolidated financial statements for further discussion.

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Revenue Recognition and Cost of Revenues. Market Services revenues (88.3% of total revenues and 65.0% of total revenues less liquidity rebates, brokerage, clearance and exchange fees in 2007) are derived from The Nasdaq Market Center and Nasdaq Market Services Subscriptions revenues. The Nasdaq Market Center revenues are variable, based on service volumes, and recognized as transactions occur. Nasdaq Market Services Subscriptions revenues are based on the number of presentation devices in service and quotes delivered through those devices. Nasdaq Market Services Subscriptions revenues are recognized in the month that information is provided. These revenues are recorded net of amounts due under revenue sharing arrangements with market participants. Pursuant to EITF 99-19, we record execution revenues from transactions on a gross basis in revenues and record related expenses such as liquidity rebate payments and execution costs as cost of revenues. We have recorded execution revenues related to the Brut and INET platforms on a gross basis since the related acquisitions, as Brut and INET have historically had risk as principal on transactions executed through their respective platforms. On February 1, 2006, Brut and INET merged together into a single broker-dealer, Brut, LLC, which was later renamed, Nasdaq Execution Services. All routed transactions are executed through Nasdaq Execution Services. Nasdaq Execution Services is registered with the SEC as a broker-dealer. Nasdaq Execution Services, as a broker-dealer, acts as principal to the transactions executed through The Nasdaq Market Center, which exposes Nasdaq Execution Services to clearance and settlement risk. Starting with the second quarter of 2005, we have reported execution revenues from transactions on our legacy Nasdaq platform on a gross basis in revenues and reported related expenses as cost of revenues, as we have certain risk associated with trade execution, subject to rule limitations and caps, as a result of our Limitation of Liability Rule. This change in presentation was implemented on a prospective basis beginning April 1, 2005 as required under U.S. GAAP, as a direct result of the rule change. Following our migration to a single trading platform, we continue to have execution risk on non-routed transactions that are conducted on our platform. We do not record a liability for any potential claims that may be submitted under the rule unless they meet the provisions of SFAS No. 5 “Accounting for Contingencies”, or SFAS 5. As such, losses arising as a result of the rule are accrued and charged to expense only if the loss is probable and estimable. Prior to the second quarter of 2005, execution revenues and the related expenses were recorded on a net basis as we did not act on a principal basis on any trades executed through our systems. In addition, under FINRA Rule 4705, we historically disclaimed any liability for losses arising from malfunctions of The Nasdaq Market Center. This rule eliminated liability or risk of loss to us for system failures. We are required to pay Section 31 fees to the SEC for supervision and regulation of securities markets, which are included in cost of revenues. We pass these costs along to our customers through our execution revenues.

Issuer Services revenues (11.7% of total revenues and 35.0% of total revenues less liquidity rebates, brokerage, clearance and exchange fees in 2007) include Corporate Client Group revenues and Nasdaq Financial Products revenues. Corporate Client Group revenues include annual fees, initial listing fees and listing of additional shares fees. Annual fees are recognized ratably over the following 12-month period. Initial listing and listing of additional shares fees are recognized on a straight-line basis over estimated service periods, which are six and four years, respectively, based on our historical listing experience. Corporate Client Group revenues also include Corporate Client services revenues, which includes our insurance business and shareholder, directors and newswire services. For our insurance business, commission income is recognized when coverage becomes effective, the premium due under the policy is known or can be reasonably estimated, and substantially all required services related to placing the insurance have been provided. The effect on income of subsequent premium adjustments, including policy cancellations, is recorded when the adjustments are known. Fee income for services other than placement of insurance coverage is recognized as those services are provided. Broker commission adjustments and commissions on premiums billed directly by underwriters are recognized when such amounts can be reasonably estimated. Shareholder.com revenues are based on subscription agreements with customers. Revenues from subscription agreements are recognized ratably over the contract period, generally one year in length. As part of subscription services, customers are also charged usage fees based upon actual usage of the services provided. Revenues from usage fees and other services are recognized when earned. PrimeNewswire generates fees primarily from wire distribution services, and revenues are recognized as services are provided. Directors Desk revenues are based on subscriptions for online services for directors. Subscriptions are one year in length and revenues are recognized ratably over the year. For Nasdaq Financial Products’ revenues, we receive license fees for our trademark licenses that vary by product based on assets or number or underlying dollar value

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of contracts issued. Nasdaq primarily has two types of license agreements, transaction-based licenses and asset-based licenses. Transaction-based licenses are generally renewable long-term agreements. Customers are charged based on transaction volume or a minimum contract amount, or both. If a customer is charged based on transaction volume, Nasdaq recognizes revenue when the transaction occurs. If a customer is charged based on a minimum contract amount, Nasdaq recognizes revenue on a pro-rata basis over the licensing term. Asset-based licenses are also generally long-term agreements. Customers are charged based on a percentage of assets under management for licensed products, per the agreement, on a monthly or quarterly basis. These revenues are recorded on a monthly or quarterly basis over the term of the license agreement.

Reserve for Bad Debts. The reserve for bad debts is maintained at a level that management believes to be sufficient to absorb estimated losses in the accounts receivable portfolio. The reserve is increased by the provision for bad debts which is charged against operating results and decreased by the amount of charge-offs, net of recoveries. The amount charged against operating results is based on several factors including, but not limited to, a continuous assessment of the collectibility of each account, the length of time a receivable is past due and our historical experience with the particular customer. In circumstances where a specific customer’s inability to meet its financial obligations is known (i.e., bankruptcy filings), we record a specific provision for bad debts against amounts due to reduce the receivable to the amount we reasonably believe will be collected. Due to changing economic, business and market conditions, we review the reserve for bad debts monthly and make changes to the reserve through the provision for bad debts as appropriate. If circumstances change (i.e., higher than expected defaults or an unexpected material adverse change in a major customer’s ability to pay), our estimates of recoverability could be reduced by a material amount.

Valuation of Goodwill and Intangible Assets. Our business acquisitions typically result in the recording of goodwill and other intangible assets, and the recorded values of those assets may become impaired in the future. As of December 31, 2007, goodwill totaled approximately $980.7 million and intangible assets, net of accumulated amortization, totaled approximately $181.6 million. The determination of the value of such goodwill and intangible assets requires management to make estimates and assumptions that affect our consolidated financial statements. We assess potential impairments to goodwill and intangible assets when there is evidence that events or changes in circumstances indicate that the carrying amount of an asset may not be recovered. Our judgments regarding the existence of impairment indicators and future cash flows related to goodwill and intangible assets are based on operational performance of our acquired businesses, market conditions and other factors. Although there are inherent uncertainties in this assessment process, the estimates and assumptions we use are consistent with our internal planning. If these estimates or their related assumptions change in the future, we may be required to record an impairment charge on all or a portion of our goodwill and intangible assets. For goodwill, if the fair value of the reporting unit is less than its carrying value, an impairment loss is recorded to the extent that the fair value of the goodwill is less than the carrying value. For indefinite-lived intangible assets, impairment exists if the carrying value of the intangible asset exceeds its fair value. For intangible assets subject to amortization, impairment is recognized if the carrying amount is not recoverable and the carrying amount exceeds the fair value of the intangible asset. In addition, for goodwill and indefinite-lived intangible assets, we are required to test for impairment at the reporting unit level annually.

Income Taxes. Estimates and judgments are required in the calculation of certain tax liabilities and in the determination of the recoverability of certain deferred tax assets, which arise from net operating loss carryforwards, tax credit carryforwards and temporary differences between the tax and financial statement recognition of revenue and expense. SFAS No. 109, “Accounting for Income Taxes,” or SFAS 109, requires that deferred tax assets be reduced by a valuation allowance, if it is more likely than not that some portion or all of the recorded deferred tax assets will not be realized in future periods. We adopted the provisions of FIN 48, on January 1, 2007.

In assessing the need for a valuation allowance, we consider all available evidence including past operating results, the existence of cumulative losses in the most recent fiscal years, estimates of future taxable income and the feasibility of tax planning strategies. In the event that we change our determination as to the amount of

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deferred tax assets that can be realized, we will adjust our valuation allowance with a corresponding impact to the provision for income taxes in the period in which such determination is made.

In addition, the calculation of our tax liabilities involves uncertainties in the application of tax regulations in the U.S. and other tax jurisdictions. We recognize potential liabilities for anticipated tax audit issues in such jurisdictions based on our estimate of whether, and the extent to which, additional taxes and interest may be due. While we believe that our tax liabilities reflect the probable outcome of identified tax uncertainties, it is reasonably possible that the ultimate resolution of any tax matter may be greater or less than the amount accrued. If events occur and the payment of these amounts ultimately proves unnecessary, the reversal of the liabilities would result in tax benefits being recognized in the period when we determine the liabilities are no longer necessary. If our estimate of tax liabilities proves to be less than the ultimate assessment, a further charge to expense would result.

Software Costs. We capitalize and amortize significant purchased application software and operational software that are an integral part of computer hardware on the straight-line method over their estimated useful lives, generally two to five years. We expense other purchased software as incurred.

Nasdaq uses Statement of Position 98-1, “Accounting for the Costs of Computer Software Developed or Obtained for Internal Use,” or SOP 98-1, for accounting for internally developed software. SOP 98-1 requires that certain costs incurred in connection with developing or obtaining internal use software be capitalized. We capitalize internal and third party costs incurred in connection with the development of internal use software.

Critical accounting policies

Preparing financial statements in accordance with IFRS requires that management make evaluations, estimates and assumptions that affect the application of the accounting principles and the stated amounts of assets, liabilities, revenues and costs. Estimates and assumptions are based on historical experience and a number of other factors that may be considered reasonable under prevailing conditions. The results of these estimates and assumptions are then used to evaluate the carrying amounts of assets and liabilities not otherwise clear from other sources. The actual outcome may deviate from these estimates and assumptions.

Estimates and assumptions are regularly reviewed by OMX’s management. Changes in estimates are reported in the period in which the change is made, if the change affects only that period, or in the period in which the change is made and subsequent periods if the change affects both the period concerned and subsequent periods.

OMX’s significant accounting principles are set out on pages F-10 to F-24 of the consolidated financial statements. Accounting principles in which estimates, judgments and assumptions are particularly sensitive and which, if actual results are different, may have a material impact on the financial statements, are discussed below.

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Critical Accounting Policies

The following provides information about our critical accounting policies. Critical accounting policies are defined as those that are reflective of significant judgments and uncertainties, and potentially result in materially different results under different assumptions and conditions. These policies relate to revenue recognition and cost of revenues, reserve for bad debts, valuation of goodwill and intangible assets, income taxes, software costs and related party transactions. For a summary of our significant accounting policies, including the accounting policies discussed below, see Note 2, “Summary of Significant Accounting Policies,” to the consolidated financial statements for further discussion.

Revenue Recognition and Cost of Revenues. Market Services revenues (84.9% of total revenues and 63.7% of gross margin in 2006) are derived from Nasdaq Market Center and Nasdaq Market Services Subscriptions revenues. Nasdaq Market Center revenues are variable, based on service volumes, and recognized as transactions occur. Nasdaq Market Services Subscriptions revenues are based on the number of presentation devices in service and quotes delivered through those devices. Nasdaq Market Services Subscriptions revenues are recognized in the month that information is provided. These revenues are recorded net of amounts due under revenue sharing arrangements with market participants. Pursuant to EITF 99-19, we record execution revenues from transactions on a gross basis in revenues and record related expenses such as liquidity rebate payments and execution costs as cost of revenues. We have recorded execution revenues related to the Brut and INET platforms on a gross basis since the related acquisitions, as Brut and INET have historically had risk as principal on transactions executed through their respective platforms. On February 1, 2006, Brut and INET merged together into a single broker-dealer, Brut, LLC, which was later renamed, Nasdaq Execution Services. All routed transactions are executed through Nasdaq Execution Services. Nasdaq Execution Services is registered with the SEC as a broker-dealer. Nasdaq Execution Services, as a broker-dealer, acts as principal to the transactions executed through The Nasdaq Market Center, which exposes Nasdaq Execution Services to clearance and

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settlement risk. Starting with the second quarter of 2005, we have reported execution revenues from transactions on our legacy Nasdaq platform on a gross basis in revenues and reported related expenses as cost of revenues, as we have certain risk associated with trade execution, subject to rule limitations and caps, as a result of our Limitation of Liability Rule. This change in presentation was implemented on a prospective basis beginning April 1, 2005 as required under GAAP, as a direct result of the rule change. Following our move to a single platform, we continue to have execution risk on non-routed transactions that are conducted on our platform. We do not record a liability for any potential claims that may be submitted under the rule unless they meet the provisions of SFAS No. 5 “Accounting for Contingencies”, or SFAS 5. As such, losses arising as a result of the rule are accrued and charged to expense only if the loss is probable and estimable. Prior to the second quarter of 2005, execution revenues and the related expenses were recorded on a net basis as we did not act on a principal basis on any trades executed through our systems. In addition, under NASD Rule 4705, we historically disclaimed any liability for losses arising from malfunctions of The Nasdaq Market Center. This rule eliminated liability or risk of loss to us for system failures. We are required to pay Section 31 fees to the SEC for supervision and regulation of securities markets, which are included in cost of revenues. We pass these costs along to our customers through our execution revenues.

Issuer Services revenues (15.1% of total revenues and 36.3% of gross margin in 2006) include Corporate Client Group revenues and Nasdaq Financial Products revenues. Corporate Client Group revenues include annual fees, initial listing fees and listing of additional shares fees. Annual fees are recognized ratably over the following 12-month period. Initial listing and listing of additional shares fees are recognized on a straight-line basis over estimated service periods, which are six and four years, respectively, based on our historical listing experience. Corporate Client Group revenues also include Corporate Client services revenues, which includes our insurance business and shareholder and newswire services. For our insurance business, commission income is recognized when coverage becomes effective, the premium due under the policy is known or can be reasonably estimated, and substantially all required services related to placing the insurance have been provided. The effect on income of subsequent premium adjustments, including policy cancellations, is recorded when the adjustments are known. Fee income for services other than placement of insurance coverage is recognized as those services are provided. Broker commission adjustments and commissions on premiums billed directly by underwriters are recognized when such amounts can be reasonably estimated. Shareholder.com revenues are based on subscription agreements with customers. Revenues from subscription agreements are recognized ratably over the contract period, generally one year in length. As part of subscription services, customers are also charged usage fees based upon actual usage of the services provided. Revenues from usage fees and other services are recognized when earned. PrimeNewswire generates fees primarily from wire distribution services, and revenues are recognized as services are provided. For Nasdaq Financial Products’ revenues, we receive license fees for our trademark licenses that vary by product based on assets or number or underlying dollar value of contracts issued. Nasdaq primarily has two types of license agreements, transaction-based licenses and asset-based licenses. Transaction-based licenses are generally renewable long-term agreements. Customers are charged based on transaction volume or a minimum contract amount, or both. If a customer is charged based on transaction volume, Nasdaq recognizes revenue when the transaction occurs. If a customer is charged based on a minimum contract amount, Nasdaq recognizes revenue on a pro-rata basis over the licensing term. Asset-based licenses are also generally long-term agreements. Customers are charged based on a percentage of assets under management for licensed products, per the agreement, on a monthly or quarterly basis. These revenues are recorded on a monthly or quarterly basis over the term of the license agreement.

Reserve for Bad Debts. The reserve for bad debts is maintained at a level that management believes to be sufficient to absorb estimated losses in the accounts receivable portfolio. The reserve is increased by the provision for bad debts which is charged against operating results and decreased by the amount of charge-offs, net of recoveries. The amount charged against operating results is based on several factors including, but not limited to, a continuous assessment of the collectibility of each account, the length of time a receivable is past due and our historical experience with the particular customer. In circumstances where a specific customer’s inability to meet its financial obligations is known (i.e., bankruptcy filings), we record a specific provision for bad debts against amounts due to reduce the receivable to the amount we reasonably believe will be collected. Due to changing economic, business and market conditions, we review the reserve for bad debts monthly and

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make changes to the reserve through the provision for bad debts as appropriate. If circumstances change (i.e., higher than expected defaults or an unexpected material adverse change in a major customer’s ability to pay), our estimates of recoverability could be reduced by a material amount.

Valuation of Goodwill and Intangible Assets. Our business acquisitions typically result in the recording of goodwill and other intangible assets, and the recorded values of those assets may become impaired in the future. As of December 31, 2006, goodwill totaled approximately $1.0 billion and intangible assets, net of accumulated amortization, totaled approximately $199.6 million. The determination of the value of such intangible assets requires management to make estimates and assumptions that affect our consolidated financial statements. We assess potential impairments to intangible assets when there is evidence that events or changes in circumstances indicate that the carrying amount of an asset may not be recovered. Our judgments regarding the existence of impairment indicators and future cash flows related to intangible assets are based on operational performance of our acquired businesses, market conditions and other factors. Although there are inherent uncertainties in this assessment process, the estimates and assumptions we use are consistent with our internal planning. If these estimates or their related assumptions change in the future, we may be required to record an impairment charge on all or a portion of our goodwill and intangible assets. Impairment exists if the carrying value of the indefinite-lived intangible asset exceeds its fair value. For intangible assets subject to amortization, impairment is recognized if the carrying amount is not recoverable and the carrying amount exceeds the fair value of the intangible asset.

Income Taxes. Estimates and judgments are required in the calculation of certain tax liabilities and in the determination of the recoverability of certain deferred tax assets, which arise from net operating loss carryforwards, tax credit carryforwards and temporary differences between the tax and financial statement recognition of revenue and expense. SFAS No. 109, “Accounting for Income Taxes,” or SFAS 109, requires that deferred tax assets be reduced by a valuation allowance, if it is more likely than not that some portion or all of the recorded deferred tax assets will not be realized in future periods.

In assessing the need for a valuation allowance, we consider all available evidence including past operating results, the existence of cumulative losses in the most recent fiscal years, estimates of future taxable income and the feasibility of tax planning strategies. In the event that we change our determination as to the amount of deferred tax assets that can be realized, we will adjust our valuation allowance with a corresponding impact to the provision for income taxes in the period in which such determination is made.

In addition, the calculation of our tax liabilities involves uncertainties in the application of tax regulations in the U.S. and other tax jurisdictions. We recognize potential liabilities for anticipated tax audit issues in such jurisdictions based on our estimate of whether, and the extent to which, additional taxes and interest may be due. While we believe that our tax liabilities reflect the probable outcome of identified tax uncertainties, it is reasonably possible that the ultimate resolution of any tax matter may be greater or less than the amount accrued. If events occur and the payment of these amounts ultimately proves unnecessary, the reversal of the liabilities would result in tax benefits being recognized in the period when we determine the liabilities are no longer necessary. If our estimate of tax liabilities proves to be less than the ultimate assessment, a further charge to expense would result.

Software Costs. We capitalize and amortize significant purchased application software and operational software that are an integral part of computer hardware on the straight-line method over their estimated useful lives, generally two to five years. We expense other purchased software as incurred.

Nasdaq uses Statement of Position 98-1, “Accounting for the Costs of Computer Software Developed or Obtained for Internal Use,” or SOP 98-1, for accounting for internally developed software. SOP 98-1 requires that certain costs incurred in connection with developing or obtaining internal use software be capitalized. We capitalize internal and third party costs incurred in connection with the development of internal use software.

Related Party Transactions. Related party receivables and payables are the result of various transactions between us and our affiliates. Prior to December 20, 2006 we were a subsidiary of NASD and transactions between Nasdaq and NASD were considered related party transactions. As discussed in Note 1, “Organization and Nature of Operations,” NASD achieved full divestiture of ownership of our common stock in 2006 and the one share of Series D preferred stock held by NASD was redeemed by Nasdaq on December 20, 2006. Therefore, as of December 20, 2006, NASD is no longer considered a related party.

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Prior to December 20, 2006, payables to related parties were comprised primarily of the regulation charge from NASDR. NASDR charges us for costs incurred related to our market regulation and enforcement. See Note 13, “Related Party Transactions,” for further discussion.

Critical Accounting Policies

The following provides information about our critical accounting policies. Critical accounting policies are defined as those that are reflective of significant judgments and uncertainties, and potentially result in materially different results under different assumptions and conditions. These policies relate to revenue recognition and cost of revenues, reserve for bad debts, valuation of goodwill and intangible assets, software costs and related party transactions. For a summary of our significant accounting policies, including the accounting policies discussed below, see Note 2, “Summary of Significant Accounting Policies,” to the consolidated financial statements for further discussion.

Revenue Recognition and Cost of Revenues. Market Services revenues (74.3% of total revenues and 57.0 % of gross margin in 2005) are derived from Nasdaq Market Center and Nasdaq Market Services Subscriptions revenues. Nasdaq Market Center revenues are variable, based on service volumes, and recognized as transactions occur. Nasdaq Market Services Subscriptions revenues are based on the number of presentation devices in service and quotes delivered through those devices. Nasdaq Market Services Subscriptions revenues are recognized in the month that information is provided. These revenues are recorded net of amounts due under revenue sharing arrangements with market participants. Pursuant to EITF 99-19, execution revenues from transactions executed through both Brut and INET are recorded on a gross basis in revenues and expenses such as liquidity rebate payments are recorded in cost of revenues as Brut and INET act as principal. Prior to the second quarter of 2005, Nasdaq’s other execution revenues were reported net of liquidity rebates as Nasdaq does not act as principal. However, during and since the second quarter of 2005 under Nasdaq’s new Limitation of Liability Rule, Nasdaq, subject to certain caps, provides compensation for losses due to malfunctions of the order-execution systems of The Nasdaq Market Center. Therefore, pursuant to EITF 99-19, Nasdaq records all execution revenues from transactions executed through The Nasdaq Market Center on a gross basis in execution and trade reporting revenues and has records liquidity rebate payments as cost of revenues as Nasdaq now has certain risk associated with trade execution subject to rule limitations and caps. This rule change in fact was made on a prospective basis beginning April 1, 2005, as required under United States GAAP. This rule change did not have a material impact on the consolidated financial position or results of operations of Nasdaq in the second, third or fourth quarters of 2005.

Issuer Services revenues (25.7% of total revenues and 43.0% of gross margin in 2005) include Corporate Client Group revenues and Nasdaq Financial Products revenues. Corporate Client Group revenues include annual fees, initial listing fees and listing of additional shares fees. Annual fees are recognized ratably over the following 12-month period. Initial listing and listing of additional shares fees are recognized on a straight-line basis over estimated service periods, which are six and four years, respectively, based on our historical listing experience. Corporate Client Group revenues also include commission income from Nasdaq Insurance Agency. Commission income is recognized when coverage becomes effective, the premium due under the policy is known or can be reasonably estimated, and substantially all required services related to placing the insurance have been provided. The effect on income of subsequent premium adjustments, including policy cancellations, is recorded when the adjustments is known. Fee income for services other than placement of insurance coverage is recognized as those services are provided. Broker commission adjustments and commissions on premiums billed directly by underwriters are recognized when such amounts can be reasonably estimated. For Nasdaq Financial Products’ revenues, we receive license fees for our trademark licenses that vary by product based on assets or number or underlying dollar value of contracts issued. Nasdaq primarily has two types of license agreements, transaction-based licenses and asset-based licenses. Transaction-based licenses are generally renewable long-term agreements. Customers are charged based on transaction volume or a minimum contract amount, or both. If a customer is charged based on transaction volume, Nasdaq recognizes revenue when the transaction occurs. If a customer is charged based on a minimum contract amount, Nasdaq recognizes revenue on a pro-rata basis over

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the licensing term. Asset-based licenses are also generally long-term agreements. Customers are charged based on a percentage of assets under management for licensed products, per the agreement, on a monthly or quarterly basis. These revenues are recorded on a monthly or quarterly basis over the term of the license agreement.

Reserve for Bad Debts. The reserve for bad debts is maintained at a level that management believes to be sufficient to absorb estimated losses in the accounts receivable portfolio. The reserve is increased by the provision for bad debts which is charged against operating results and decreased by the amount of charge-offs, net of recoveries. The amount charged against operating results is based on several factors including, but not limited to, a continuous assessment of the collectibility of each account, the length of time a receivable is past due and our historical experience with the particular customer. In circumstances where a specific customer’s inability to meet its financial obligations is known (i.e., bankruptcy filings), we record a specific provision for bad debts against amounts due to reduce the receivable to the amount we reasonably believe will be collected. Due to changing economic, business and market conditions, we review the reserve for bad debts monthly and make changes to the reserve through the provision for bad debts as appropriate. If circumstances change (i.e., higher than expected defaults or an unexpected material adverse change in a major customer’s ability to pay), our estimates of recoverability could be reduced by a material amount.

Valuation of Goodwill and Intangible Assets. Our business acquisitions typically result in the recording of goodwill and other intangible assets, and the recorded values of those assets may become impaired in the future. As of December 31, 2005, goodwill totaled $961.9 million and intangible assets, net of accumulated amortization, totaled $215.5 million. The determination of the value of such intangible assets requires management to make estimates and assumptions that affect our consolidated financial statements. We assess potential impairments to intangible assets when there is evidence that events or changes in circumstances indicate that the carrying amount of an asset may not be recovered. Our judgments regarding the existence of impairment indicators and future cash flows related to intangible assets are based on operational performance of our acquired businesses, market conditions and other factors. Although there are inherent uncertainties in this assessment process, the estimates and assumptions we use are consistent with our internal planning. If these estimates or their related assumptions change in the future, we may be required to record an impairment charge on all or a portion of our goodwill and intangible assets. Impairment exists if the carrying value of the indefinite-lived intangible asset exceeds its fair value. For intangible assets subject to amortization, impairment is recognized if the carrying amount is not recoverable and the carrying amount exceeds the fair value of the intangible asset.

Software Costs. We capitalize and amortize significant purchased application software and operational software that are an integral part of computer hardware on the straight-line method over their estimated useful lives, generally two to five years. We expense other purchased software as incurred.

Nasdaq uses Statement of Position 98-1, “Accounting for the Costs of Computer Software Developed or Obtained for Internal Use,” for accounting for internally developed software. SOP 98-1 requires that certain costs incurred in connection with developing or obtaining internal use software be capitalized. We capitalize internal and third party costs incurred in connection with the development of internal use software.

Related Party Transactions. Related party receivables and payables are the result of various transactions between us and our affiliates. Payables to related parties are comprised primarily of the regulation charge from NASDR. Receivables from related parties relates to cash disbursements funded by us on behalf of our affiliates. NASDR charges us for costs incurred related to Nasdaq market regulation and enforcement.

Critical Accounting Policies

The following provides information about our critical accounting policies. Critical accounting policies are defined as those that are reflective of significant judgments and uncertainties, and potentially result in materially different results under different assumptions and conditions. These policies relate to revenue recognition and cost of revenues, software costs, related party transactions and reserve for bad debts.

Revenue Recognition and Cost of Revenues. Market Services revenues (61.9% of total revenues and 57.5 % of gross margin in 2004) are derived from Nasdaq Market Center and Nasdaq Market Services Subscription revenues. Nasdaq Market Center revenues are variable, based on service volumes, and recognized as transactions occur. Nasdaq Market Services Subscriptions revenues are based on the number of presentation devices in service and quotes delivered through those devices. Nasdaq Market Services Subscriptions revenues are recognized in the month that information is provided. These revenues are recorded net of amounts due under revenue sharing arrangements with market participants. Pursuant to EITF 99-19, execution revenues from transactions executed through Brut are recorded on a gross basis in revenues and expenses such as liquidity rebate payments are recorded in cost of revenues as Brut acts as principal. Nasdaq’s other execution revenues will continue to be reported net of the liquidity rebate as Nasdaq does not act as principal. Issuer Services revenues (38.1% of total revenues and 42.5% of gross margin in 2004) include Corporate Client Group revenues and Nasdaq Financial Products revenues. Corporate Client Group revenues include annual fees, initial listing fees and listing of additional shares fees. Annual fees are recognized ratably over the following 12-month period. Initial listing and listing of additional shares fees are recognized on a straight-line basis over estimated service periods, which are six and four years, respectively, based on our historical listing experience. For Nasdaq Financial Products’ revenues, we receive license fees for our trademark licenses related to the QQQ and other financial products linked to Nasdaq indices issued in the United States and abroad. These revenues are recognized as earned.

Software Costs. We capitalize and amortize significant purchased application software and operational software that are an integral part of computer hardware on the straight-line method over their estimated useful lives, generally two to seven years. We expense other purchased software as incurred.

Nasdaq uses Statement of Position 98-1, “Accounting for the Costs of Computer Software Developed or Obtained for Internal Use,” for accounting for internally developed software. SOP 98-1 requires that certain costs incurred in connection with developing or obtaining internal use software be capitalized. We capitalize internal and third party costs incurred in connection with the development of internal use software.

Related Party Transactions. Related party receivables and payables are the result of various transactions between us and our affiliates. Payables to related parties are comprised primarily of the regulation charge from NASD. NASD charges us for costs incurred related to Nasdaq market regulation and enforcement. Receivables from related parties relates to cash disbursements and loans funded by us on behalf of our affiliates.

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Reserve for Bad Debts. The reserve for bad debts is maintained at a level that management believes to be sufficient to absorb estimated losses in the accounts receivable portfolio. The reserve is increased by the provision for bad debts which is charged against operating results and decreased by the amount of charge-offs, net of recoveries. The amount charged against operating results is based on several factors, including a continuous assessment of the collectibility of each account. In circumstances where a specific customer’s inability to meet its financial obligations is known (i.e., bankruptcy filings), we record a specific provision for bad debts against amounts due to reduce the receivable to the amount we reasonably believe will be collected. For all other customers, provisions for bad debts are made based on the length of time the receivable is past due and historical experience. For receivables past due 31-60 days, 61-90 days and over 90 days, the outstanding account balances are reserved for at 10.0%, 50.0% and 100.0% of the outstanding account balances, respectively. If circumstances change (i.e., higher than expected defaults or an unexpected material adverse change in a major customer’s ability to pay), our estimates of recoverability could be reduced by a material amount.