Sismey-Durrant’s announcement comes just three months after he also took over control of the lender’s commercial mortgages operation following former managing director Colin Bell’s unexpected departure.
He has spent more than forty years in the financial services industry and joined Hampshire Trust Bank in 2012.
Hampshire Trust Bank chairman Robert Sharpe confirmed the lender had already begun to search for a successor to Sismey-Durrant.
“In the meantime Mark will remain as chief executive officer and said continue to work with the board and management team to grow the business,” said Sharpe.
“Having recently reached the fortieth anniversary of his career in banking he has decided that the time is right for him to retire from full time executive roles.
“Mark has made a tremendous contribution to Hampshire Trust Bank through its acquisition, its move to London and the implementation of its strategy. Under his leadership the Bank has focused on serving its customers and generated good returns for its shareholders,” he added.
Sismey-Durrant (pictured) said he was “immensely proud” of what the business had achieved for its customers, employees and shareholders.
“During my banking career I have seen many changes affecting our markets – how we do business and the importance of serving our customers,” he said.
“Looking forward, it will be no different. When my successor is appointed and I close my career as an executive banker, they will find a strong, well established customer focused business managed by a great team and set fair for the next exciting stage in its growth and development.
“In the meantime, I will work with continued commitment to progress the delivery of our current plans for Hampshire Trust Bank,” he added.