Mergent FISD (via WRDS)ISD contains issue details on over 140,000 corporate, corporate MTN (medium term note), supranational, U.S. Agency, and U.S. Treasury debt securities and includes more than 550 data items. FISD provides details on debt issues and the issuers, as well as transactions by insurance companies. It is used to research market trends, deal structures, issuer capital structures and other areas of fixed income debt research. New users must register for a WRDS account for access.