Phil Beahon played semi-professional cricket for Cheshire and Lancashire clubs. His brother Tom played youth football for Tranmere Rovers. Both ended their playing careers in 2013.
The brothers moved to London to work in finance and raise money. Phil worked at Deloitte and Tom at Lloyds Bank.
They started Castore on 6 July 2015 in Bebington, Merseyside, and launched online in 2016. Before launch they interviewed people at high-end gyms and signed investors from fashion and sport. Andy Murray became a shareholder in 2019.
Castore moved into team kit, signing Rangers in 2020 and later becoming the Umbro team-sports licensee in several European markets. In August 2021 Phil and Tom were the largest shareholders, each with 18.59%.