Making It Work: Belfast gym equipment company goes from strength to strength Blk Box sells its products to gyms and sporting bodies around the world, and is now expanding its offering to consumers at home 29th January, 2021 Gregory Bradley, the founder of Blk Box, sells to the likes of Arsenal FC, Kerry GAA and Irish Rugby As the founder of Blk Box, Gregory Bradley is at the helm of a growing company with annual revenues of £10 million and ambitious plans for expansion in 2021. The 32-year-old had a very different start in business, however, cutting his teeth at college as a part-time importer of high street clothing for resale online.