Restoring ratings

Trust in credit ratings has been tarnished due to the subprime crisis, heaping pressure on agencies to make changes to the way they rate collateralised debt obligation tranches. But market participants are already accusing one firm of going too far. Mark Pengelly reports


Credit ratings make the collateralised debt obligation (CDO) market tick. But credit market contagion, set off by bad US subprime mortgages, has created interest in ratings from far outside the CDO market itself.

July 2007 heralded the shock downgrades of thousands of tranches of residential mortgage-backed securities and hundreds of CDOs of asset-backed securities (ABSs) linked to them. Soon after, the first barrage was fired in a regulatory and legislative assault against rating agencies that

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