Adjustable-rate (ARM) Fannie Mae MBS Subtypes are alphanumeric codes that identify ARM product characteristics such as index, initial fixed-rate period, rate and payment adjustment frequency and caps, convertibility, and other features.
The following files contain certain key features of adjustable-rate mortgages backing Fannie Mae MBS. These features constitute the particular subtype of an adjustable-rate Fannie Mae MBS pool identified in the matrix file. Subtypes are only applicable to adjustable-rate securities. The latest subtype definitions are available after 7 a.m. ET, and will include any new subtypes created the prior day.
Our consolidated listings of all Single-Family (SF) and Multifamily (MF) subtypes and attributes are available in .csv and .xls format. Please allow automatic updating when opening the .xls file with your spreadsheet application.
You may also select specific Single-Family ARM Fannie Mae MBS subtype groups, which are displayed by reference index in text format (.txt).