Account number format change - Implementation date


Further to Announcement A19019, Clearstream Banking1 confirms that effective

22 November 2021

it will extend the current pool of account numbers and update all business application to support an alphanumeric account numbering format for new Creation accounts (including CFF-FIA accounts).

The new account numbering format will consist of five alphanumerical characters, starting with at least one digit followed by a combination of letters and figures, for example: 1101D; 312AD; 6C12G.

The new format will complement and exist in parallel to the current five-digit numerical account format. New Creation accounts that will be opened after 20 November 2021 could be opened either in the current existing numerical format or in the new alphanumerical format.

Alphanumerical account format

The account number assignment process is fully automated and algorithm-based, therefore, only an indicative start date can be defined for when alphanumeric accounts will be actually applied by Clearstream Banking.

Existing accounts will not be changed, that means only newly opened accounts may be alphanumeric in the future.

Impact on customers

The application and use of the new alphanumerical format will not occur before 20 November 2021.

Therefore, in order to maintain current business operations when the alphanumerical format becomes operational, customers are reminded to assess their operational and technical readiness, and address necessary system enhancements to process account numbers in both numerical and alphanumerical formats.

Customers are requested to validate their procedures for the management of, for example, settlement instructions, corporate actions messages for income and non-income events or invoices because they may contain alphanumerical account numbers in the future.

Further information

For further information, customers may contact Clearstream Banking Customer Service or their Relationship Officer.


1. Clearstream Banking refers collectively to Clearstream Banking S.A., registered office at 42, avenue John F. Kennedy, L-1855 Luxembourg, and registered with the Luxembourg Trade and Companies Register under number B-9248, and Clearstream Banking AG (for Clearstream Banking AG customers using Creation Accounts), registered office at 61, Mergenthalerallee, 65760 Eschborn, Germany and registered in Register B of the Amtsgericht Frankfurt am Main, Germany under number HRB 7500.