The firm, which last year celebrated its 40th anniversary, is part of the Dresdner banking group and currently employs over 200 staff in each island.
The company says it remains committed to its business in Jersey and Guernsey and to the Channel Islands as a finance centre.
Chief executive Richard Robins said: ‘We are confident that this restructuring will deliver a better service to our clients and improve efficiency within our organisation.
‘We very much regret that we have had to make these roles redundant and the resulting impact on some of our staff.
To provide support to those affected, we have enlisted the services of professional outplacement consultants.’