| Black Halo Glasgow Ltd | Glasgow | 2020 |
| Black Hart Tattoos Ltd | Hadleigh | 2023 |
| Black Hawk Holdings Limited | Southall | 2021 |
| Black Hawk Protection Ltd | London | 2025 |
| Black HAY Trustees Limited | Prestwick | 2019 |
| Black Heart Collective Ltd | Rugeley | 2024 |
| Black Heart Foundation (UK) Limited | London | 2010 |
| Black Heritage Support Service C.I.C. | Birmingham | 2020 |
| Black Hole Storage Limited | Chippenham | 2007 |
| Black Honey Tattoos Limited | Monmouth | 2024 |
| Black Horse Chauffeurs Ltd | Surrey | 2025 |
| Black Horse Investments (UK) Ltd | Okehampton | 1993 |
| Black Hound Tattoo Limited | Thame | 2023 |
| Black House Salon Limited | Huddersfield | 2019 |
| Black in Business Ltd | London | 2022 |
| Black INK (Hull) Limited | Ryehill | 2014 |
| Black INK (Leeds) Limited | Ryehill | 2018 |
| Black INK Academy Ltd | Ryehill | 2022 |
| Black INK Tattoo Limited | Southampton | 2024 |
| Black Isle Farmers' Society | Inverness | 2001 |
| Black IVY Ltd | Ilford | 2010 |
| Black LAB Productions Limited | Stoke-On-Trent | 2018 |
| Black Label Concierge Ltd | London | 2025 |
| Black Label Events Ltd | London | 2010 |
| Black Label Grading Ltd | Heathfield | 2020 |
| Black Label Industries Limited | Lyminge | 2011 |
| Black Label Ltd | London | 2018 |
| Black Label Tattoo Academy Limited | Pontefract | 2025 |
| Black Labour Movement UK (BLM UK) | London | 2018 |
| Black Lace (NE) Ltd | Stockton-On-Tees | 2023 |
| Black Lace Ltd | Stockton-On-Tees | 2016 |
| Black Lane Services Ltd | Barking | 2018 |
| Black Lantern Limited | Chandler'S Ford | 2017 |
| Black Leather Limited | Manchester | 2024 |
| Black Letter (Gloucester) Ltd | Gloucester | 2013 |
| Black Letter Studios Limited | Gloucester | 2014 |
| Black Light Production Services Limited | Newbridge | 2022 |
| Black Line Athletic Strength Ltd | London | 2026 |
| Black Line Barbers Ltd | Edinburgh | 2025 |
| Black Line for Investment Ltd | Manchester | 2024 |
| Black Line Growth Limited | Borehamwood | 2025 |
| Black Lion Hill WD7 Ltd | Welwyn Garden City | 2019 |
| Black Lives in Music Limited | London | 2020 |
| Black Lives Matter Movement Ltd | London | 2021 |
| Black Lobster Limited | Dinas Powys | 2023 |
| Black Loch Environmental Consultants Ltd | Perth | 2024 |
| Black Lotus Barbers Ltd | Stirling | 2019 |
| Black Magic Tanning UK Limited | Warrington | 2014 |
| Black Magick Dirah Ltd | Poole | 2021 |
| Black Mango Inc Ltd | Chester | 2012 |
| Black Market Lifestyle Ltd | London | 2021 |
| Black Market Tattoo Ltd | Leicester | 2019 |
| Black Mesa Technology Limited | Whitehills Business Park | 2012 |
| Black Minority Ethnic Disability Family Network CIC | Rotherham | 2026 |
| Black Mosaic Limited | Boston | 2016 |
| Black Moth Barbers and Tattoo Ltd | Hornchurch | 2023 |
| Black Moth Barbers Limited | Hornchurch | 2012 |
| Black Moth Tattoo's Ltd | Colchester | 2018 |
| Black Moth Woman Ltd | Hornchurch | 2018 |
| Black Mothers Network Ltd | Leighton Buzzard | 2026 |
| Black Mountain Consultancy Limited | London | 2021 |
| Black Mountain Dog Company Limited | Ammanford | 2025 |
| Black Mountains Acupuncture Limited | Brecon | 2011 |
| Black Muse Limited | Manchester | 2025 |
| Black Oak Group Ltd | London | 2018 |
| Black Oak Security Limited | Sheffield | 2018 |
| Black on Black Ltd | County Durham | 2002 |
| Black Opal Consulting Ltd | London | 2023 |
| Black Opal Tattoo Limited | Newcastle | 2020 |
| Black Oracle Ltd | Wolverhampton | 2023 |
| Black Panda Spa Ltd | London | 2025 |
| Black Panther Construction Limited | Chelmsford | 2019 |
| Black Panther Interior Limited | London | 2019 |
| Black Pear Creative Ltd | London | 2021 |
| Black Petal Collective Ltd | Exeter | 2025 |
| Black Phoenix Tattoo Ltd | Romford | 2025 |
| Black Piano Holdings Limited | Bishop'S Stortford | 2020 |
| Black Pink Beauty Ltd | Glasgow | 2025 |
| Black Plague Tattoo Limited | Great Yarmouth | 2020 |
| Black Politicos Community Interest Company | London | 2024 |
| Black Queer Women C.I.C. | Chesterfield | 2023 |
| Black Researcher Consortium C.I.C. | London | 2024 |
| Black Rhino Concerts Ltd | London | 2025 |
| Black Robin Ltd | London | 2017 |
| Black Rose Barber Co. Ltd | Daventry | 2020 |
| Black Rose Barbers & Tattoo Studio Ltd | Barrow-In-Furness | 2024 |
| Black Rose Barbers Limited | Bideford | 2018 |
| Black Rose Enterprise Limited | Manchester | 2024 |
| Black Rose Tattoos Ltd | London | 2020 |
| Black SAT Ltd | London | 2016 |
| Black Scorpion Ltd | London | 2022 |
| Black Sea 1913 Ltd | Watford | 2022 |
| Black Sea Fish Ltd | Harrow | 2018 |
| Black Sea Investment Ltd | London | 2022 |
| Black Sea Tattoo Ltd | Newquay | 2024 |
| Black Series Professional Detailing Ltd | Lincoln | 2019 |
| Black Shed Flowers Ltd | Sherborne | 2017 |
| Black Sheep Barbers Kent Ltd | Herne Bay | 2024 |
| Black Sheep Piercing Limited | Great Yarmouth | 2005 |
| Black Sheep Tattoo Ltd | Bristol | 2021 |