According a statement released by AvH, current management and staff will retain the remaining 30% of the business.
Ackermans & van Haaren CEO Luc Bertrand said that they believe that the British market for onshore wealth management is very attractive given the existing investment culture for equities and the advent of discretionary management which leads to relatively stable profits and revenues.
"Our firm has now reached a size, with over £6.3bn of client funds, where a powerful partner will further accelerate growth, said JM Finn chairman James Edgedale.
"For our clients, there will be no change, but the support of a prominent European group will clearly be positive. For our people, the raised growth will lead to more opportunities as we raise our profile and attract more new clients," he added.
The EUR67m deal has been done through Ackermans wealth management affiliate, Delen Investments.
AvH said Delen will finance this investment out of its own cash resources, thereby maintaining a core tier 1 ratio above 15%.
The transaction is expected to close at some point in third quarter of this year subject to FSA approval.
Between them Delen and JM Finn will manage over EUR22bn in client wealth.
