Fannie Mae Selling Guide Chapter C3-5: Pooling Loans into ARM MBS
There are two primary types of ARM MBS pools with weighted-average coupons, also called ARM Flex pools.
Fannie Mae publishes the full text of this section: Fannie Mae Single Family Selling Guide on the Fannie Mae website. Zeitro Strata answers questions about it with the passage and page cited.
Guideline text quoted as published by the agency. The latest published version governs. This is not an underwriting decision.