Ratings: Yet more triple-A ratings are under threat

Fitch’s proposed new methodology will tighten CDO ratings, and Moody’s is considering abolishing its current ratings scale altogether.

Leaving to one side profound uncertainty about investors’ risk appetite for CDO product in the medium term, there is a strong possibility that the triple-A rating will become a rarity in structured credit.

First, Fitch raised the market’s ire by proposing to shift its methodology on synthetic corporate risk CDOs to a dramatically more conservative stance. The agency predicted, following the implementation of the new model, five-notch downgrades on average for deals rated under previous assumptions.

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