Sumo Group is undergoing a leadership transition as CEO Carl Cavers, COO Paul Porter, and Director of Excellence and Integration Darren Mills step down after 22 years. CFO Andy Stewart and newly-promoted COO Gary Dunn will share the chief executive responsibilities. Tim Repa-Davies has been promoted to the board. Cavers expressed pride in their achievements and confidence in Sumo's future, while Stewart highlighted the natural evolution of the company.