| BLA 2060 Limited | Reading | 2016 |
| BLA Manen Investment Limited | London | 2025 |
| BLA Manen Limited | London | 2025 |
| Blabers Ltd | Coventry | 2024 |
| Black & Beautiful (UK) Limited | | 1999 |
| Black & Blue (Restaurants) Limited | Bexleyheath | 2015 |
| Black & Co. Consulting Ltd | Newport | 2019 |
| Black & Decker Pension Trustee Limited | Rotherham | 1990 |
| Black & White Accounting Services Ltd | Basingstoke | 2018 |
| Black 22 Bars and Restaurants Limited | Crawley | 2007 |
| Black and Blue Limited | Bexleyheath | 2015 |
| Black and White Equation Capital, Ltd. | Stafford | 2021 |
| Black and White Orca Ltd | London | 2021 |
| Black and White Services Ltd | North Shields | 2024 |
| Black Antelope Coaching Ltd | London | 2017 |
| Black Anvil Limited | Clogher | 2010 |
| Black ASH Consulting Limited | London | 2016 |
| Black Asset Management Ltd | Wybunbury | 2013 |
| Black Avalanche Limited | Bexhill On Sea | 2014 |
| Black Bear Club Ltd | London | 2024 |
| Black Bear Investments Limited | Thrapston | 2014 |
| Black Belt Ltd | Worcester | 2015 |
| Black Biitz Ltd | Harrow | 2020 |
| Black Bourton Road Management Company Limited | Carterton | 2007 |
| Black Box Industries Ltd | Billingshurst | 2022 |
| Black BOY Worldwide Limited | Aylesbury | 2013 |
| Black Brothers Limited | London | 2017 |
| Black Bull Holdings Ltd | Street | 2016 |
| Black Bull Properties Limited | Letchworth Garden City | 2012 |
| Black Cabs (Stoke-On-Trent) Limited | Stoke-On-Trent | 2008 |
| Black Cat Acoustics Limited | Tonbridge | 2006 |
| Black Cat Fuels Limited | Birchwood | 2005 |
| Black Cat Industries Ltd | London | 2015 |
| Black Cats Investment Ltd | Brighton & Hove | 2018 |
| Black Cocodrile Ltd | London | 2021 |
| Black Code International Limited | Stafford | 2011 |
| Black Consultants Ltd | Liverpool | 2015 |
| Black Country Ales Limited | Coventry | 2025 |
| Black Country Alloys Limited | Kingswinford | 2018 |
| Black Country Excursions Limited | Netherton, Dudley | 1991 |
| Black Country Pest Control Limited | Oldbury | 2016 |
| Black Country Scooters Limited | Stourbridge | 2021 |
| Black Dating App Limited | London | 2020 |
| Black Diamond Builders Limited | Oldbury | 2010 |
| Black Dog Chili Company Limited | Woodbridge | 2013 |
| Black Dyke Mills Band Limited | Bradford | 1971 |
| Black Eagle Sailing Ltd | Harrow | 2023 |
| Black Edge Limited | York | 2015 |
| Black Event Furniture Limited | Wetherby | 2019 |
| Black Falcon Yachting Ltd | Blackpool | 2024 |
| Black Fish Design Limited | East Sussex | 2005 |
| Black FOX Accounting Limited | Tamworth | 2024 |
| Black Gold Films Limited | Richmond | 2021 |
| Black Gold Limited | Reading | 2005 |
| Black Goose Ventures Ltd | Burnham On Crouch | 2010 |
| Black Graphic Design Ltd. | Glasgow | 1996 |
| Black Hole Limited | Blandford | 2009 |
| Black Horse Mischief Limited | Whitchurch | 2017 |
| Black Horse Travel Ltd | Blackburn | 2025 |
| Black House Creative Ltd | Inverness | 2013 |
| Black Hunter Investment, Ltd | Luton | 2015 |
| Black Impulse Ltd. | Cardiff | 2015 |
| Black Isle Homes Limited | Edinburgh | 2015 |
| Black Isle Solar Ltd | Forres | 2022 |
| Black Key Ltd | London | 2025 |
| Black Kifaru Records Ltd | Leatherhead | 2009 |
| Black Kite Racing Ltd | Southsea | 2015 |
| Black Label Homes Limited | Burnley | 2014 |
| Black Little Star Ltd | London | 2021 |
| Black Lyons Ltd | Burton Upon Trent | 2017 |
| Black Magnolia Ltd | Cardiff | 2017 |
| Black Market Property Limited | Bewdley | 2010 |
| Black Mill Brewery Ltd | Beverley | 2016 |
| Black Mountain Bikes Limited | Birmingham | 2017 |
| Black Mountain Insulation Limited | Southminster | 2013 |
| Black OIL Consultants Limited | | 2006 |
| Black Olives Event Catering Ltd | Waltham Cross | 2021 |
| Black on Silver Limited | Stockton-On-Tees | 2017 |
| Black Orchard Group Limited | Ilford, London | 2025 |
| Black Orchid Kitchens Limited | Glasgow | 2007 |
| Black Panda Limited | London | 2017 |
| Black Pear Games Limited | Worcester | 2021 |
| Black Penny Pickups Ltd | Trowbridge | 2024 |
| Black Phantom Limited | Cardiff | 2019 |
| Black Pine Ltd | London | 2021 |
| Black Pounds Matter Ltd | Wednesbury | 2020 |
| Black Retail Limited | Enniskillen | 2009 |
| Black River Chocolate Limited | Upminster | 2013 |
| Black Rock BTC Ltd | Manchester | 2025 |
| Black Rock Immigration Ltd | London | 2016 |
| Black Rose Store Limited | London | 2021 |
| Black Sea August Ltd | London | 2020 |
| Black Sea Brokers Limited | Bolton | 2019 |
| Black Seed Films Limited | Chelmsford | 2018 |
| Black Sheep Barbers Limited | Stratford-Upon-Avon | 2012 |
| Black Sheep Restaurants (London) Limited | London | 2022 |
| Black Spot (Group) Co., Ltd | London | 2017 |
| Black Star Books Limited | Ipswich | 2019 |
| Black Stars Global Holdings Limited | Cardiff | 2021 |
| Black Stone Group Trading Co., Ltd | London | 2025 |