Shares of Assured Guaranty Ltd. fell 5.4% on Friday as the bond insurance holding company told investors about strategies it could try to maintain its double-A ratings.

Assured's AA-plus rating from Standard & Poor's is currently at risk as the rating agency considers adopting new methodologies that could result in downgrading the insurer "by one or more rating categories … unless those insurers raise additional capital or reduce risk."

Subscribe Now

Independent and authoritative analysis and perspective for the bond buying industry.

14-Day Free Trial

No credit card required. Complete access to articles, breaking news and industry data.