conditional prepayment rate

Conditional prepayment rate is an annualized measure of how fast a mortgage pool's principal prepaid during a period. It is the number traders quote first when comparing agency MBS speeds, because it converts monthly voluntary prepayments into a comparable annual figure per security.

In this slice it is a Ginnie Mae disclosure product. The Ginnie Mae Investor Disclosure Portal tags 'cpr', 'rpb' and 'prepayment speeds', and its short description names "Disclosure Plus dashboards for CPR, delinquency, forbearance and cohort analysis" at security/pool granularity searchable by CUSIP or pool number across MBS, HMBS, REMIC and Platinum.

Underneath sit raw files: Ginnie Mae Disclosure Data and Reports carries 'prepayment speeds' and 'cpr' among its tags, with pool-level records, 32 pool supplemental record types and loan-level LL records from which speeds are computed.

Prepayment speed drives yield. A pool prepaid faster than modeled returns principal early and shortens weighted-average life, so any valuation, hedge or relative-value screen built on wrong speeds misprices the position twice.

Dashboard-only access limits you. Disclosure Plus gives current-period CPR plus 12 months of history per query; multi-year work needs the Disclosure Data History archives, which retain monthly files back to January 2020 per prefix.

Terms bind downstream use. Both sources restrict use to analysis of Ginnie Mae MBS credit performance and prohibit identifying individuals — a research pipeline that joins these files to other identity-bearing data violates them regardless of accuracy.

1. Confirm the security identifier key. The Investor Disclosure Portal resolves CPR by CUSIP or pool number across MBS, HMBS, REMIC and Platinum; without that join key, speeds cannot attach to holdings.
2. Check whether history ships. Portal queries give current factor plus 12-month history or WHFIT tax-year views; longer panels require the Disclosure Data History monthly archives.
3. Price the file sizes before committing. Monthly portfolio zips run ~430-469 MB each, the quarterly Loan Performance file ~782 MB, the annual ~2.3 GB — storage and ETL budgets follow.

Where to see it in context: commercial-residential-mortgage-finance data.

• delinquency-rate — The share of balances past due, tracked beside CPR in Ginnie Mae cohort dashboards and NMDB performance tables.
• pool-factor — The fraction of original principal still outstanding, published per CUSIP in Ginnie Mae factor files; CPR is its monthly change annualized.
• remic-structure — The tax-neutral multi-class wrapper Ginnie Mae uses to repackage pools, searchable alongside CPR in the portal.