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The highest bond rating by S&P and Fitch. A rating of AAA is considered to carry virtually no risk; U.S. Treasury securities, for example, always receive the AAA rating. A bond with an AA is investment-grade, meaning that banks are allowed to hold them. AA bonds are low risk and low return. The rating is equivalent of an Aaa rating by Moody's.
The highest grade assigned to a debt obligation by a rating agency. It indicates an unusually strong capacity to pay interest and repay principal. Also called triple A.