OneClearstream documentation for Issuer and Investor-CSD service


Please note that this page and the attached Functional Specifications were updated.

Following Clearstream Banking1 Announcements D17028, D17034 and D17039 we are pleased to provide customers with further information about the OneClearstream Functional Specifications.

In addition to the ESES migration planned for 9 April 2018, customers holding assets on the existing CBF link to Italy will be affected by the implementation of our enhanced Investor-CSD solution which will translate into a mandatory migration on 26 March 2018.

In order to help customers preparing for this migration, Clearstream Banking hereby publishes the OneClearstream Functional Specifications Release 3.0 describing market-specific processes for the Italian market.

Release 3.0 of the functional specifications also includes updates concerning generic services (for example, alternative BIC) published in previous releases and includes additional samples for the French market.

Furthermore, Clearstream Banking publishes the document OneClearstream Asset Servicing - CBF issued securities describing the enhanced Issuer-CSD service (Germany). The adoption of OneClearstream services for the enhanced Issuer-CSD service is optional for customers.

The most recent Functional Specifications Release and the document OneClearstream Asset servicing - CBF issued securities are attached to this announcement.

We would like to remind customers that the technical specifications related to the SWIFT formats are available in the Xact via SWIFT User Guide.

Starting in Q4 2017, Clearstream Banking will provide testing facilities, as well as a dedicated test support team, to enable customers to test their adaptation to the new and updated processes and interfaces. We will be publishing further details in a customer test guide that will be available soon.

Further information

For further information, clients may contact Clearstream Banking Client Services or their Relationship Officer.


1. This Announcement is published by Clearstream Banking AG (CBF), registered office at Mergenthalerallee 61, 65760 Eschborn, Germany, registered with the Commercial Register of the District Court in Frankfurt am Main, Germany, under number HRB 7500.