- CIK: Central Index Key: unique registrant identifying ID from the US SEC.
- GVKEY: Compustat unique company identifier.
- CUSIP: CUSIP (Committee on Uniform Security Identification Procedures) Service Bureau.
Compustat now includes CIK in their Company file, along with GVKEY and other descriptive variables such as company name and SIC code. Not all GVKEYs have a matching CIK.
CUSIP in Compustat Xpressfeed is a 9-digit, issue-specific identifier stored in the Security file. They may be more than one CUSIP for a given GVKEY. Compustat provides a variable named PRIUSA, which is the primary issue in the United States for most GVKEYs.
WRDS created a master table - FUNDA - that includes GVKEY, CIK, CUSIP, and many data items. CUSIP in the FUNDA table is missing for GVKEYs where no primary issue is identified and more than issue exists.