Agency pass through trading
CUSIP aggregation is a process through which a number of existing MBS issued or and original term to maturity, are consolidated into a larger pass-through security. The aggregated CUSIP securities are similar to those agency MBS being Agency MBS are created when residential mortgage loans that meet agency underwriting guidelines1 are securitized into a pass-through security. Investors in the market-value-weighted index covering U.S. dollar-denominated, fixed-rate and adjustable-rate/hybrid mortgage pass-through securities issued by Ginnie Mae