This excerpt taken from the NDAQ 8-K filed Feb 20, 2008.
Application of first time adoption IFRS1
For financial reporting purposes, the cost of acquiring a business is allocated to the assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition for both IFRS and U.S. GAAP. Any excess of purchase cost over the fair values assigned to the acquired net assets is reported as goodwill. Under IFRS 1, a first time adopter may elect to not apply IFRS 3 Business combinations fully retrospectively to business combinations completed in prior years. OMX adopted IFRS for the first time 2005 and chose not to apply IFRS 3 to acquisitions prior to 2004 such as HEX and Stockholms Fondbörs. As a result, application of U.S. GAAP under SFAS 141 and 142 which require OMX to identify, to measure, and to separately account for intangible assets such as licenses, customer relationships, trademarks and technology apart from Goodwill, was not met. For this purpose, valuations were prepared using estimates and assumptions provided by management. OMX has identified a difference between U.S. GAAP and IFRS, relating to its acquisitions of Stockholms Fondbörs and Helsinki Stock Exchange.
For both Stockholms Fondbörs and the Helsinki Stock Exchange, customer contracts for listing and issuance were identified as acquired intangible assets. Internal use software was also identified as an intangible asset for the Stockholms Fondbörs. The customer contracts were valued using a fair value model based on discounted cash flows for the related operations. The fair value of internal use software was identified based on the assessed repurchase value of the asset. The customer contracts are amortized over 20 years. The internal use software is amortized over 10 years.