One Insurance was created in 2013 following a rebrand of some divisions
Tristan Scaife, the operations director for the Tourquay-based One Insurance Solutions, a subsidiary of Brightside is leaving the broker.
Scaife is the latest senior person to leave the company.
Insurance Times reported on Tuesday that chief operations officer Tony Coram and chief people officer Kate Banks had left the broker, while former chief executive Andy Wallin departed last month.
The One Insurance Solution brand was created in early 2013 after several Brightside divisions; One Business Insurance Solutions, Mini Bus Direct, One Bike Insurance, Motor and Home Direct, You Choose Insurance and Taxi Direct were rebranded.
Brightside declined to comment.