Treasury Group head of distribution Rob Sullivan has resigned from the company.
Sullivan said he left to take up a new position, but could not yet disclose what that was.
"I enjoyed my time with Treasury Group and I'm now looking forward to a new challenge," he said.
Treasury Group head of retail distribution Peter Walsh will assume overall responsibility for the group's distribution team on an interim basis.
"During his tenure at Treasury Group, Rob has made a significant contribution to the development of the businesses of our boutique partners through marketing and distribution of funds, particularly to Australian institutional investors," Treasury Group chief executive Andrew McGill said.
Sullivan's contract required him to serve a notice period of three months and it also contained non-compete provisions, Treasury said.
