This excerpt taken from the NDAQ 10-Q filed May 8, 2009.
Early Extinguishment of Debt
In March 2009, we repurchased $24 million principal amount of the 2.50% convertible senior notes and recognized a pre-tax gain on the early extinguishment of debt of $4 million (net of debt issuance and other costs of $0.4 million) which is recorded in general, administrative and other expense in the Condensed Consolidated Statements of Income for the three months ended March 31, 2009. The aggregate principal amount outstanding on these notes as of December 31, 2008 was $475 million. As a result of this repurchase, the remaining aggregate principal amount outstanding on these notes as of March 31, 2009 was $451 million.