Concentration accounts are internal accounts used by financial institutions to aggregate funds from or for various clients or other accounts. They are also known as omnibus accounts or suspense accounts. The use of concentration accounts may obscure the audit trail and the identity of the clients involved in the transactions. Therefore, the Wolfsberg Principles on Private Banking, which are a set of voluntary guidelines for preventing money laundering and terrorist financing in the private banking sector, prohibit the use of concentration accounts in a way that would prevent appropriate monitoring or identification of the clients or their funds12.
References:
1: Wolfsberg Anti-Money Laundering Principles for Private Banking (2012), Section 4.3 2: The Wolfsberg Principles - an analysis, Journal of Money Laundering Control, Vol. 7 No. 3, 2004, pp. 237-240 Reference: http://www.wolfsberg-principles.com/privat-banking.html (1.2.2, 5th bullet)