ARM MBS Subtypes

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).

19_WSJ_1-year_LIBOR.txt
1__11th_District_Cost_of_Funds_Index.txt
25_WSJ_6-month_LIBOR.txt
29_WSJ_1-year_LIBOR.txt
2__1-year_CMT.txt
35_WSJ_6-month_LIBOR.txt
3__5-year_CMT.txt
49_Wkly_Auction_Avg_Yield-6mo_T_Bills.txt
4__6-month_Auction_Avg_Discount_Rate.txt
55_5-year_Treasury_Security_Weekly.txt
5_Freddie_Mac_Federal_Cost_of_Funds.txt
5__FHLB_Monthly_Median_Cost_of_Funds.txt
69_WSJ_1-year_LIBOR.txt
6__6-month_Auction_Avg_Investment_Rate.txt
75_1-year_CMT_weekly.txt
79_1-year_Weekly_CMT.txt
7__FHLB_Contract_Rate.txt
7__PRIMARY_MTG_MKT_SURVEY_PLUS_REPLACED_FHLB_CONTRACT_RATE.txt
85_30-DAY_AVERAGE_SOFR.txt
89_WSJ_Prime_CMT.txt
8__3-yr_CMT.txt
9__6-month_Auction_Average_Secondary_Market.txt
A9_Cum_Avg_of_Prev_12_mo_6-mo_Treasury.txt
A__1-year_CMT_Monthly.txt
B9_12-month_Average_of_1-year_CMT.txt
B__Monthly_Avg_of_6-mo_Wkly_Auct_Avg_Rates.txt
C9_1-year_Treasury_Security_Weekly.txt
E5_WSJ_1_year_LIBOR.txt
E9_3-year_CMT_Weekly.txt
E__2-year_CMT.txt
F9_5-year_CMT_Weekly.txt
F__10-year_CMT_Weekly_Average.txt
G__Wkly_Avg_of_Secndry_Mrkt_Rates_on_6-mo_CD.txt
H9_6-month_Weekly_Auction_Avg_Investment.txt
H__3-year_CMT_Monthly.txt
I__Monthly_Avg_Secondary_Mrkt_Rate_on_6-mo_CD.txt
J5_WSJ_1_Year_LIBOR.txt
J9_Auct_Avg_on_Ann_Dscnt_Basis_1-yr_T-bill.txt
K5_Cum_Avg_of_Prev_12_mo_1-yr_Treasury.txt
K9_GW_Financial_Avg_Deposit_Acct_Rate_COSI.txt
K__Wall_Street_Journal_6-month_LIBOR.txt
L9_Cum_Avg_of_Prev_12_mo_1_yr_CMT_Monthly.txt
L_Freddie_Mac_Federal_Cost_of_Funds_QTRLY.txt
L__Natl_Avg_COF_for_SAIF-insured_Inst.txt
M9_Freddie_Mac_Federal_Cost_of_Funds.txt
M9_Natl_Median_COF_for_SAIF-insured_Inst.txt
MF_Consolidated_report.csv
MF_Consolidated_report.xls
M_6-month_WSJ_LIBOR.txt
N5_WSJ-1YR-LIBOR.txt
N_12-month_Average_of_1-year_CMT.txt
O__Wall_Street_Journal_3-month_LIBOR.txt
P9_Wall_Street_Journal_1-year_LIBOR.txt
Q9_FHLMC_Fed_COF.txt
R9_Fannie_Mae_60-day_Required_Yield.txt
S9_Cum_Avg_of_26_wks_6-month_T-bill_Wkly_Avg.txt
SF_Consolidated_report.csv
SF_Consolidated_report.xls
T__5-year_CMT_Monthly_Average.txt
U5_WACHOVIA_COST_OF_SAVINGS_INDEX_(79).txt
U5_WACHOVIA_COST_OF_SAVINGS_INDEX_79.txt
U9_1-year_Weekly_CMT.txt
U__Wall_Street_Journal_1-month_LIBOR.txt
V5_1-year_Weekly_CMT.txt
V9_Natl_Avg_Contract_Mortgage_Rate.txt
V9_PRIMARY_MTG_MKT_SURVEY_PLUS_REPLACED_Natl_Avg_Contract_Mortgage_RT.txt
V__Cum_Avg_of_Previous_12_months_1-yr_CMT.txt
W5_1_year_Treas_Cum_Avg_Last_12_Months.txt
W_1-year_WSJ_LIBOR.txt
X9_1-year_Treasury_Security-weekly-rate.txt
Y5_Wells_Fargo_Cost_of_Savings_Monthly.txt
Y9_Golden_West_Fin_Cost_of_Deposits-CODI.txt
Z9_WSJ_1-year_LIBOR.txt
Z__12-month_Average_of_Monthly_1-yr_CMT.txt
snglix75.txt