Jonny Murch, managing director at Red Torch, as well as directors Alex Ross and Chris Argyle-Robinson have taken joint ownership of the firm.
The agency’s clients include the governing body for swimming, FINA, Québec City and World Rugby.
Fiona Higney, the previous owner of Red Torch, set the agency up eight years ago to manage the marketing for the SportAccord Convention.
Murch said: "We pride ourselves in being a people-centric agency, inside and out. It's fantastic to have had the opportunity to buy and continue to invest in our business, and is testament to the confidence we have in the assured future of RedTorch."
To coincide with the buyout, RedTorch has also launched its new website.