| BL Rugby Limited | London | 2019 |
| BL Wendover Limited | Aylesbury | 2025 |
| Bl-Wright Ltd | Bromley | 2021 |
| BL2023 Limited | London | 1993 |
| BLA Studios Limited | Gloucester | 2016 |
| BLA2EX Limited | Tunbridge Wells | 2023 |
| Blaby Beauty Clinic Limited | Leicester | 2020 |
| Blaby Mill Stables Limited | Leicester | 2001 |
| Blaby Nails 2 Limited | Birmingham | 2020 |
| Blac Ribbon Clothing Limited | Purfleet | 2019 |
| Blacc + Blond Ltd | Birmingham | 2019 |
| Black & Even Ltd | Tunbridge Wells | 2015 |
| Black & White Management Associates Ltd | Warwick | 2024 |
| Black 365247 Ltd | Edinburgh | 2018 |
| Black 68 Limited | York | 1990 |
| Black Abbey Glasgow Limited | Glasgow | 2020 |
| Black Anchor Tattoo Parlour Ltd | London | 2020 |
| Black Ancora Limited | Feltham | 2018 |
| Black and Blue (a) Limited | Bexleyheath | 2008 |
| Black and Brass Tattoo Collective Ltd | Plymouth | 2021 |
| Black and Gold Services Ltd | Belvedere | 2022 |
| Black and Gray Ltd | Gt Harwood | 2017 |
| Black and White Barbers 25 Ltd | Colchester | 2025 |
| Black and White Men's Grooming Ltd | Aberdeen | 2023 |
| Black and White Premium Barbers Ltd | Norwich | 2020 |
| Black and White Shine Limited | London | 2021 |
| Black Angel Ltd | Cardiff | 2023 |
| Black Arrow Solutions Ltd | Droitwich | 2026 |
| Black Bear Tattoo Studios Ltd | Colchester | 2021 |
| Black Beauty Spmu Limited | Low Fell | 2022 |
| Black Belt Barbers Ltd | London | 2024 |
| Black Belt Group Ltd | London | 2025 |
| Black Birdcage Entertainment Ltd | Enfield | 2014 |
| Black Box Collective Ltd | Bournemouth | 2024 |
| Black Box Sauna Ltd | Ross-On-Wye | 2025 |
| Black Box Security Alarm Systems Ltd | Chorley | 1990 |
| Black Box Tattoo Ltd | Sutton | 2021 |
| Black Bright Tattoo Ltd | Burley In Wharfedale | 2025 |
| Black British City Group | London | 2018 |
| Black BUN Limited | St. Albans | 2020 |
| Black Business Club (UK) Ltd | London | 2024 |
| Black Business Lincolnshire CIC | Lincoln | 2025 |
| Black Cat Cafe/ Bar Ltd | Ramsgate | 2016 |
| Black Cat International Limited | London | 2026 |
| Black Cat Services Limited | London | 2026 |
| Black Cat Systems Limited | London | 2026 |
| Black Cat Tattoo Ltd | North Yorkshire | 2005 |
| Black Chair Academy Limited | Whitefield | 2019 |
| Black Chair Rental Ltd | Manchester | 2018 |
| Black Cherry Tattoo Limited | Newport | 2019 |
| Black Communications Limited | London | 1999 |
| Black Core Kent C.I.C. | Hythe | 2025 |
| Black Country Barbers Ltd | Grimsby | 2019 |
| Black Country Barbershop Ltd | Wednesbury | 2011 |
| Black Country Chamber of Commerce & Industry | Wolverhampton | 2001 |
| Black Country Concrete Ltd | Birmingham | 2018 |
| Black Country Foodbank Limited | Oldbury | 2009 |
| Black Country Furniture Repairs and Reupholstery Limited | Brierley Hill | 2022 |
| Black Country Make CIC | Wolverhampton | 2014 |
| Black Country Money Matters CIC | Tipton | 2023 |
| Black Country Pallets (Midlands) Limited | Droitwich | 2018 |
| Black Country Pallets Limited | Cradley Heath | 2008 |
| Black Country Partnership for Care C.I.C. | Wolverhampton | 2016 |
| Black Country Reclamation Limited | Wolverhampton | 1992 |
| Black Country Service Solutions Ltd | Kingswinford | 2019 |
| Black Creative Media Ltd | Cupar | 2025 |
| Black Crown Creative Limited | London | 2019 |
| Black Dagger Tattoo Ltd | Norwich | 2015 |
| Black Dahlia Hackney Ltd | London | 2022 |
| Black Dawg Vermin Control Ltd | Hunstanton | 2019 |
| Black Dial.Co Ltd | Accrington | 2026 |
| Black Diamond Auto Spa Limited | London | 2018 |
| Black Diamond Furniture Ltd | Southall | 2026 |
| Black Diamond Stud Ltd | Chippenham | 2021 |
| Black Dog Agency Ltd | England | 2017 |
| Black Dog French Polishing Services Ltd | Ledbury | 2003 |
| Black Dog Marine Engineering Ltd | Looe | 2018 |
| Black Dog Sound Limited | Congleton | 2014 |
| Black Door Limited | Whitley Bay | 2012 |
| Black Door Productions Ltd | London | 2020 |
| Black DOT Systems Ltd. | London | 2023 |
| Black Doves Pro Ltd | Hatfield | 2025 |
| Black Dragon Tattoo Studio Limited | Newton Abbot | 2014 |
| Black ELK Home Surveys Limited | Milton Keynes | 2009 |
| Black Essence London Ltd | Barking | 2021 |
| Black Events Agency Limited | Cardiff | 2019 |
| Black Falcon International Ltd | London | 2019 |
| Black Family Practitioners Network (Bfpn) CIC | Birmingham | 2024 |
| Black Female Entrepreneur Greenwich Ltd | London | 2018 |
| Black Female Travellers LDN Ltd | Mildenhall | 2019 |
| Black Food Funding Limited | London | 2025 |
| Black Founders Hub Ltd | London | 2020 |
| Black Galleon Ltd | King'S Lynn | 2014 |
| Black Girls Book Club C.I.C. | London | 2019 |
| Black Girls Booked Ltd | Bristol | 2022 |
| Black Girls Hike UK C.I.C. | Manchester | 2020 |
| Black Global Trust | London | 2021 |
| Black Goat Barber Co. Ltd | Weymouth | 2023 |
| Black Gold Center Ltd | London | 2020 |
| Black Gold Studios Ltd | Treorchy | 2026 |