what is cusip
CUSIP is an acronym that refers to Committee on Uniform Security Identification. Procedures and the nine-digit, alphanumeric CUSIP numbers that are used to identify. securities, including municipal bonds. A CUSIP number, similar to a serial number, is. assigned to each maturity of a municipal security issue. The first six characters are known. as the base, or CUSIP-6, and uniquely identify the bond issuer.