The Analysis Institutional investors around the world are required to prove to their audit committees, senior management, and regulators that their investments are in fact "investment grade." For many investors, "investment grade" is an internal definition; for many banks and insurance companies "investment grade" is also defined by regulators. We consider whether or not a reasonable U.S. bank investor would judge Morgan Stanley (which converted to a U.S. bank holding company in September 2008) to be "investment grade" under the June 13, 2012 rules mandated by the Dodd-Frank Act of 2010. For a discussion of the implications of the Dodd-Frank Act on the definition of investment grade, see our post on Citigroup in December.