Why would a CUSIP for a security be available on the Freddie Mac Web site and not on Bloomberg?
The security you are searching for is likely a Multiple Maturity CUSIP (Multimaturity) pool. Multimaturity pools are Freddie Mac’s second generation of mortgage PCs, issued from 1972 to 1984. These pools were the first “factored” pools issued by Freddie Mac. One way in which Multimaturity pools differ from other non-Gold PCs is that there is more than one CUSIP associated with each pool. At least two certificates with different CUSIPs were issued for each pool. Generally, the CUSIPs for a pool are in alphabetical sequence. Also, the issue and maturity dates and/or the coupons may vary for each certificate within a Multimaturity pool. Only prefixes 15, 16 and 17 contain Multimaturity pools. Bloomberg is set up to recognize only one CUSIP per pool. Generally, the CUSIP that Bloomberg uses for the Multimaturity pools is the “lead” CUSIP, which is the first CUSIP associated with the pool. However, even if the CUSIP is not displayed on Bloomberg, the principal factor is the same for all val
