| Black Bird/Red Rose Productions | Frome | 1997 |
| Black Book Design Collective Ltd | Cheltenham | 2025 |
| Black Book Sports Limited | London | 2025 |
| Black Box Boys Ltd | Houghton Regis | 2018 |
| Black Box Echo Ltd. | Milton Keynes | 2014 |
| Black Box Muay Thai Ltd | Bathgate | 2019 |
| Black Box Promotions Limited | Walsall | 2015 |
| Black Box Stage Crew Limited | London | 2021 |
| Black Box Theatrical Limited | Hamilton | 2025 |
| Black Brick Creative Limited | London | 2020 |
| Black Bright Theatre Company Limited | Sheffield | 2024 |
| Black Brighton Ltd | London | 2023 |
| Black British Comedy Awards Ltd | London | 2026 |
| Black British Comedy Ltd | London | 2026 |
| Black British Dance Edition Ltd | London | 2024 |
| Black British Theatre Awards C.I.C. | London | 2018 |
| Black Brook Theatre Ltd | Colchester | 2026 |
| Black by Nattasha Ltd | Northampton | 2026 |
| Black Canvas Records Ltd | Cockfosters | 2016 |
| Black Carat Limited | Cheltenham | 2022 |
| Black Card Competitions Limited | Leatherhead | 2026 |
| Black Card Experiences Ltd | London | 2026 |
| Black Castle Sports Management Limited | London | 2018 |
| Black Cat Archery Ltd | Swindon | 2008 |
| Black Cat Creation Limited | London | 2015 |
| Black Cat Filmmaking Ltd | Enfield | 2024 |
| Black Cat Print Club Limited | Cardiff | 2023 |
| Black Cat Styles Ltd | Southport | 2022 |
| Black Cinema Limited | London | 2020 |
| Black Circle Tattoo Studio Ltd | Walsall | 2023 |
| Black Citrine Ltd | Chester | 2022 |
| Black Coconut Ltd | London | 2015 |
| Black Compass LLC Ltd | London | 2026 |
| Black Coppice Films Ltd | Leicester | 2021 |
| Black Country Barbell Limited | Stourbridge | 2016 |
| Black Country Boxing Academy C.I.C. | Wednesbury | 2020 |
| Black Country Championship Wrestling Limited | Birmingham | 2024 |
| Black Country Gymnastics Ltd | Bromsgrove | 2025 |
| Black Country Leisure Limited | Cradley Heath | 2007 |
| Black Country Leisure Zone Ltd | Stourbridge | 2024 |
| Black Country Light and Sound Limited | Cardiff | 2017 |
| Black Country Martial Arts Ltd | Dudley | 2019 |
| Black Country Touring | Smethwick | 1997 |
| Black Country Triathletes Limited | South Staffordshire | 2007 |
| Black Country Visual Arts CIC | Wolverhampton | 2014 |
| Black Country Wellbeing Hub CIC | Dudley | 2019 |
| Black Creative Trailblazers CIC | Manchester | 2024 |
| Black Crow Training Ltd | Milton Keynes | 2025 |
| Black Curators Collective CIC | Nottingham | 2021 |
| Black Danda Ltd | Watford | 2025 |
| Black Dear Entertainment Limited | Guildford | 2025 |
| Black Desert OFF Road Training Limited | Treharris | 2014 |
| Black Diamond Academy Ltd | Tranent | 2024 |
| Black Diamond Entertainment Ltd | Northampton | 2025 |
| Black Diamond Gym Ltd | Ilford | 2021 |
| Black Diamond Gym UK Community Interest Company | Ilford | 2026 |
| Black Diamond Music Ltd | London | 2023 |
| Black Diamond Music Records Limited | Southall | 2019 |
| Black Diamond Tattoos Limited | Romford | 2018 |
| Black Diamonds Creations CIC | Birmingham | 2024 |
| Black Diamondz Limited | Uxbridge | 2012 |
| Black Dingo Limited | Broxburn | 2021 |
| Black Dog Limited | London | 2003 |
| Black Door Agency Ltd | London | 2017 |
| Black Door Yachting Ltd | Egham | 2021 |
| Black DOT PMI Ltd | Cheshire | 2003 |
| Black Dove Limited | London | 2013 |
| Black Dyke Mills Heritage Venue CIC | Bradford | 2020 |
| Black Events Global Ltd | Nantwich | 2026 |
| Black Feet Studios Ltd | Matlock | 2026 |
| Black Finger Rigging Ltd | Dollar | 2026 |
| Black Flash Promotions Ltd | Bury | 2020 |
| Black Footballers Partnership CIC | London | 2021 |
| Black FOX Management Limited | Whyteleafe | 2013 |
| Black Girl Joy Limited | London | 2025 |
| Black Girl Knit Club Ltd | Barking | 2020 |
| Black Gold Event Rigging Ltd | Aberdare | 2026 |
| Black Harpy Tattoo Ltd | Crowborough | 2023 |
| Black Hawk Laser Games Ltd | Oswestry | 2014 |
| Black Heart AXE Throwing Ltd | London | 2026 |
| Black Heart Entertainment Ltd | Swadlincote | 2025 |
| Black Heart Studios Ltd | Middlesbrough | 2026 |
| Black Heart Tattoo Ltd | Kidderminster | 2017 |
| Black Heroes in the Hall of Fame Limited | Croydon | 2024 |
| Black Hole Films Ltd | Wakefield | 2021 |
| Black Hope Tattoo Limited | Colchester | 2018 |
| Black Hound Productions Ltd | Radstock | 2022 |
| Black Ice Academy Limited | Romford | 2019 |
| Black Island Studios Limited | Reading | 1991 |
| Black Jacks ARE Wild Film Company 2023 Limited | Chobham | 2023 |
| Black Joy Presents Ltd | Woodford Green | 2024 |
| Black Knights Parachute Centre Limited | Preston | 1979 |
| Black Knights Parachute Club Ltd | Preston | 2014 |
| Black Koffee Limited | Lichfield | 2022 |
| Black Kreative Ltd | Huddersfield | 2022 |
| Black Lace Events Ltd | Manchester | 2023 |
| Black Lamb Ltd | Conwy | 2014 |
| Black Legacy Projects Ltd | London | 2025 |
| Black Lights Projects CIC | Manchester | 2023 |
| Black Line Limited | Rainham | 2014 |