Mortgage-Backed Security - MBS Definition Investopedia - Definition of Mortgage-Backed Security MBS A type of asset-backed security that is secured by a mortgage or collection of mortgages. These securities must also be
Mortgage-Backed Securities Fanniemae.com - Fannie Mae pools loans and converts them into single-class mortgage-backed securities. each individual issue of Fannie Mae MBS or Fannie Megas securities. Tax Factors