Clearstream Banking S.A. (CB) is the clearing and settlement division of Deutsche Börse, based in Luxembourg and Frankfurt.
Clearstream was created in January 2000 through the merger of Cedel International and Deutsche Börse Clearing. Its main functions are acting as International Central Securities Depository (ICSD), Clearstream also acts as the Central Securities Depository (CSD) for Germany and Clearing House for a number of securities. It is one of the biggest custodians and clearer of the eurobonds market.
If one is seeking a XS ISIN number there are two main avenues to pursue: Clearstream and Eurolcear. Both are permitted to issue ISIN code numbers in the form of “XS ISIN” codes.