AAA The highest rating given on bonds by bond rating agencies. Investopedia Says: AAA bonds are thought to have virtually no risk of default. Moody's and Standard & Poor's are the most widely used rating agencies. Related Terms: Bond Bond Rating Credit Quality Default Default Risk Standard and Poor's - S&P AAA The highest rating given on bonds by bond rating agencies. Investopedia Says: AAA bonds are thought to have virtually no risk of default. Moody's and Standard & Poor's are the most widely used rating agencies. Related Terms: Bond Bond Rating Credit Quality Default Default Risk Standard and Poor's - S&P |