The investment platform has appointed Tim Yule chief executive following the retirement of Vincent Hua who took on the dual roles of company head and investment chief.
Yule, who has been with Mason Stevens for six years, was promoted from managing director and co-head of sales.
Before joining Mason Stevens in 2016, Yule was head of sales at UBS.
He has also worked at the Royal Bank of Scotland, Perpetual, and Westpac.
Mason Stevens chair Patrick Handley said Yule had played an integral part in the platform's growth.
"He has been on the journey for our entire technology build and the development of our product set, and is very well placed to take the business forward," Handley said.
Yule said: "We are embarking on an exciting time for the business. Our foundations are strong, and we are just coming off the largest half of inflows in the firm's history.
"Our leading investment platform technology combined with decades of collective investment expertise and support is proving to be a very attractive proposition for advisers and their clients."
"We have always been incredibly focused on our platform clients; delivering an outstanding client experience, alongside investment insights, and that will remain at the core of what we do. It is what makes us unique in the market and drives our deep and enduring client relationships. In short, we are a 'Platform with a Purpose'."
"Commenting on the retirement of the outgoing chief executive, Handley said Hua had played a role in the firm's achievements in the last decade which has seen funds under administration grow to $7 billion.
"His contribution has been invaluable, especially in the development of our unique offering of providing a wide range of investment opportunities to our clients," the chair added.