Simon Thomas will step down as an executive director of Just Group after 12 years in his role as chief financial officer at the business.
David Richardson, who is currently group deputy chief executive officer and managing director of UK corporate business of Just Group, will in addition to his current responsibilities be appointed interim chief financial officer.
Mr Richardson was previously chief financial officer of Partnership Assurance Group for more than three years.
Mr Thomas will depart from Just Group on 31 October, and is leaving with the mutual consent of the groups.
Just Group is currently looking for Mr Thomas’ replacement and the company will be making a further announcement in due course.
Chris Gibson-Smith, chairman of Just Group said: "On behalf of the board I would like to take this opportunity to thank Simon for his leadership and significant contributions during his time at Just, including his key role in helping the business through the process of responding to [equity release mortgages].
"I would also like to thank David for taking on the role as interim chief financial officer."
"We are very fortunate to have someone with his experience and deep understanding of Just Group who can step into the role and ensure the business remains in capable hands during the interim period."
Rodney Cook, chief executive of Just, said: "I would like to add my personal thanks to Simon for the great support he has given me and the valuable contribution he has made to the business over the past 12 years, while we have worked together to build the company."
In the first six months of 2018, Just Group saw sales of defined benefit (DB) de-risking solutions increase by 143 per cent to £718m in the first six months of 2018.
The group said the boost in sales was due to an acceleration in the market due to employee benefit consultants had managed the industry pipeline.