The investment company run by Arpad “Arki” Busson has lost a key executive committee member. It is a further blow for the flamboyant hedge fund manager, whose firm has racked up multimillion-dollar losses.

Sonia Bhasin, group general counsel at LumX and one of only four executive committee members at the Swiss investment company, will leave the firm at the beginning of next year, according to a statement from the company.