This excerpt taken from the NDAQ 10-Q filed May 9, 2008.
Net Interest Income (Expense)
Net interest income was $1.5 million for the quarter ended March 31, 2008, compared with net interest expense of $18.0 million for the quarter ended March 31, 2007, an increase of $19.5 million. The increase was primarily due to a decrease in interest expense due to a lower outstanding debt balance prior to February 27, 2008, when we incurred new debt for the business combination with OMX. The lower debt balance prior to February 27, 2008 was primarily due to the repayment in full of our outstanding debt obligations in September 2007 from the proceeds of the sale of our share capital of the LSE. In addition, $324.9 million of the principal amount of the 3.75% convertible notes that were outstanding in the first quarter of 2007 were converted primarily in the fourth quarter of 2007, which reduced the principal amount outstanding. Further contributing to the increase was additional interest income on higher cash balances due to the cash proceeds received from the sale of the share capital of the LSE.