The financial definition for Pass through securities:
A pool of fixed income securities backed by a package of assets (i.e., mortgages) where the holder receives the principal and
interest payments. Related: Mortgage pass-through security
Agency securities Securities issued by federally related institutions and U.S. government-sponsored entities. Such agencies were created to reduce borrowing costs for certain sectors of the economy, such as agriculture.
Book entry securities
Book entry securities System in which securities are not represented by paper securities but are maintained in computerized records at the securities in the names of member banks, which in turn keep computer records of the securities they own as well as those they are holding for customers. In the case of other securities where a securities has developed, certificates reside in a central securities or by another securities. These securities do not move from holder to holder.
Certificate of Accrual on Treasury Securities (CATS)