A bbb-rated corporate bond has a yield to maturity
31 May 2018 Here's the quick version of how bond ratings work. first two use similar ratings, with AAA being the best, followed by AA, A, BBB, While higher-rated bonds have a lower risk of default, they also generally have lower yields. As of this writing, a AA-rated corporate bond with a 10-year maturity yields 3.86%,