John Simmonds, currently managing director of Advisory Services Ltd and a current Thinc board director, will succeed Simon as chief executive, subject to regulatory approval.
Simon Chamberlain said: "After 20 years in the industry as an adviser, manager, director and chief executive officer, it is time to place Thinc in the hands of a new leader, to take it forward over the next five years with as much vigour and enthusiasm as I have done in the last five years.
“All my time has been committed to our model, and more importantly our people, and now there's three young children, and of course my wife, who I need to be with at this most important time in their lives. Thinc has now been successfully integrated into the AXA stable and therefore this is the right time to place the same kind of priority on my family life as I have placed on my worklife for the last 20 years."
Tim Trotter, chairman of Thinc Group, said: “Simon has worked tirelessly and shown real entrepreneurial spirit to build the Thinc Group into the major advisory firm it is today and I wish him every success in his future ventures. He has built a strong management team at Thinc and he leaves the business in excellent shape. John Simmonds has a fantastic track record in the industry and his appointment provides seamless continuity for Thinc as we drive forward with our ambitious expansion plans.”
John Simmonds said: “Our strategy is to continue to build Thinc into a highly professional adviser firm of significant scale in the marketplace. We already have a strong team at Thinc and I am looking forward to building on these foundations to create a market-leading advisory business.”