MMC Contrarian chief executive Andrew Fairweather is to leave the group.
Fairweather, who joined the Sydney-based investment manager from AMP, is to work out a six months notice period.
"On behalf of the board I would like to thank Andrew for his contribution to the company over the past three and half years," MMC chairman Kevin Eley said.
"I will be working with Andrew to secure an appropriate replacement who will be responsible for continuing with the company's expansion in the wealth management industry."
Fairweather has not yet accepted another role.
"I have a couple of very interesting roles in the pipeline but am going to take my time," he told Investordaily.
MMC is a boutique fund manager with more than $570 million of funds under management.