The CUSIP Service Bureau, which is operated by Standard & Poor's for the American Bankers Association, exists for the primary purpose of uniquely identifying issuers and issues of financial instruments within a standard framework, and disseminating this data to the financial marketplace via various media. The CUSIP Master Files provide CUSIP numbers, standardized descriptions and additional data attributes for over 5 million corporate, municipal and government securities offered in North America.
In order to use this service, you must request an account. University of Texas at Austin faculty, Ph.D. students, and Master’s students may request an account by choosing the "register for a WRDS account" link via the web page linked above. Accounts will be activated within 48 business hours.