Mortgage Choice chief executive officer Paul Lahiff has resigned from his current role after six years with the company.
However, he has agreed to continue in his role as the company searches for a new chief executive.
A Mortgage Choice spokesperson said the search for a replacement will be conducted both internally and externally using a recruiter.
Mortgage Choice chairman Peter Ritchie said that Lahiff's resignation meant a new phase for Mortgage Choice.
"In business, every new leader will bring something to the table and we expect this to be the case here," Ritchie said.
"Moving forward, it is business as usual for Mortgage Choice as the transition phase commences.
"We look ahead to a bright future, one in which we are well positioned to take advantage of numerous opportunities thanks to our robust business model."
There will be further concentration on diversification as the company branches out into mortgage broking for personal and commercial loans, the spokesperson said.
The largest individual shareholder in the company with a 15.2 per cent stake, Count Financial, declined to comment on the appointment.
In February Count Financial announced it had recorded a $3.9 million loss from its investment in the Mortgage Choice business.