Insurance penetration has fallen to new lows in the month since Moody's Investors Service placed triple-A insurers Assured Guaranty Corp. and Financial Security Assurance Inc. on review for downgrade.

About 6.2% of new issues have come to the market insured since the announcement July 21, compared to 20.9% year to date, according to Thomson Reuters data. As a result of the announcement, both companies have taken steps to try to reassure the market about their stability.

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