This Technical Note introduces a newly developed approach for TBA selection in RiskManager. The new methodology matches a TBA deal of a given coupon to a specific vintage (origination year) considering four major market factors: liquidity, current production coupon, projected future value, weighted OAS of each origination year and historical prepayment. The new process will run monthly and update the relevant characteristics (WAC, WAM, WALA, etc.) once the agencies have delivered the relevant...

This Technical Note introduces the Specified Pool Analytics feature, and its tuning methodology used by the Agency Mortgage-Backed Securities collateral model in RiskManager. This new feature takes into account the so-called loan properties, such as original loan size, loan-to-value, FICO score, geographic distribution, property type, loan purpose, and occupancy, to improve the prepayment speed forecasts for specified mortgage pools. The Specified Pool Analytics Tuning methodology is applied...