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Published on 22 April 2025

FAQ national reporting B4.5 and B4.6

CSSF

From 2 January 2024, the CSSF requires that credit institutions transmit their national reports B4.5 (Analysis of shareholdings) and B4.6 (Persons responsible for certain functions and activities) using one of the two following methods:

• A dedicated eDesk approach accessible via the eDesk Portal;

• An API solution based on the submission of a structured exchange file (json format) via the S3 protocol (“simple storage service”).

Historical national reportings “B4.5 - Analysis of shareholdings” (Circular CSSF 12/553) and “B4.6 - Persons responsible of certain functions and activities” (Circular CSSF 13/576) are merged into a single eDesk procedure National Banking Reporting.

Following the dedicated communication and the start of the reporting campaign, the CSSF has received several questions from supervised entities (SEs). As some of the questions may be of interest for other SEs as well, the CSSF has decided to make these questions and answers public. These FAQs aim at clarifying certain elements of the new procedure.

The FAQs will be regularly updated when required.

Please note that the list of requested functions and activities for section B4.6 is available in the annex of the FAQ.

The corresponding user guide is also available on eDesk, detailing the procedures for completing, validating and submitting these B4.5 and B4.6 national reports.

https://www.cssf.lu/wp-content/uploads/FAQ-national-reporting-B4.5-and-B4.6.pdf