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Default in 10 Months After AAA Spurred Justice on Credit Ratings

In May 2007, Standard & Poor’s confirmed its initial AAA ratings on $772 million of a collateralized debt obligation known as Octonion I. Within 10 months, the Citigroup Inc. deal defaulted, costing investors and the bank almost all their money.

The CDO, which repackaged mortgage-backed securities and other similar bundles of debt, was among dozens of transactions valued at tens of billions of dollars in 2007 that the ratings firm never should have blessed, the Justice Department said Feb. 4 in a lawsuit filed in Los Angeles.