| Britannia Products Limited | Extraterritorial | 1967 |
| Britannia Wellcare Limited | Health & social care | 2024 |
| Brithome Goods Ltd | Wholesale & retail | 2025 |
| Britian Windows Limited | Manufacturing | 2013 |
| British Asian Kitchen Limited | Administrative & support | 2024 |
| British Asian Rugby Association C.I.C. | Education | 2023 |
| British Wool Marketing Board Pensions Trustee Limited | Financial services | 2008 |
| Britmark Solutionz Ltd | Wholesale & retail | 2025 |
| Britnest Eco Solutions Ltd | Construction | 2025 |
| Britney & Blossom Ltd | Wholesale & retail | 2025 |
| Britsoul Ltd | Other services | 2022 |
| Britton & Co Cleaning Services Ltd | Administrative & support | 2024 |
| Brivic Ltd | Wholesale & retail | 2024 |
| BRO Investors Ltd | Real estate | 2021 |
| Broad Lane Motors Limited | Wholesale & retail | 2014 |
| Broadcast and Events Ltd | Information & communication | 2019 |
| Broadevents Limited | Wholesale & retail | 2025 |
| Broadford Tool Hire Ltd | Administrative & support | 2025 |
| Broadgate Holdings Ltd | Extraterritorial | 2022 |
| Broadgate SPV Ltd | Real estate | 2024 |
| Broadgate Walk Limited | Real estate | 2023 |
| Broadlands Developments Limited | Construction | 2023 |
| Broadlea Furniture Limited | Manufacturing | 2026 |
| Broadway Solicitors Limited | Professional & scientific | 2021 |
| Broadway Spa Ltd | Other services | 2025 |
| Broadways Estate Ltd | Real estate | 2018 |
| Bromstead Limited | Health & social care | 2017 |
| Bronte Design & Print Limited | | 1980 |
| Bronte GAS Services Ltd | Construction | 2013 |
| Bronte Holidays Ltd | Professional & scientific | 2019 |
| Bronte Legal Consultants Limited | Professional & scientific | 2018 |
| Bronte Lettings Limited | Real estate | 2019 |
| Bronte Tails & Trails Ltd | Other services | 2025 |
| Bronte Tyres & MOT Centre Ltd | Wholesale & retail | 2021 |
| Bronte Windows Limited | Construction | 2025 |
| Bronze Dragon Trading Limited | Wholesale & retail | 2023 |
| Bronze Emporium Ltd | Other services | 2025 |
| Brooke & Bean Ltd | Wholesale & retail | 2025 |
| Brooke Motor Group Ltd | Wholesale & retail | 2017 |
| Brookes Mechanical Ltd | Construction | 2018 |
| Brookfield Essentials Ltd | Wholesale & retail | 2025 |
| Brookfield Leisure Limited | Arts & recreation | 2025 |
| Brookfield Preston Ltd | Arts & recreation | 2025 |
| Brookfields Motors Ltd | Wholesale & retail | 2026 |
| Brooklands Pharmacy Limited | Health & social care | 2015 |
| Brooklyn Shutters & Blinds UK Ltd | Manufacturing | 2025 |
| Brooks Building Limited | Real estate | 2006 |
| Brooks Cash & Carry Ltd | Wholesale & retail | 2025 |
| Brooks Hair & Beauty Limited | Other services | 2020 |
| Brooks Haircare Limited | Wholesale & retail | 2020 |
| Brookwater Accountants Ltd | Professional & scientific | 2020 |
| Brookwater Ltd | Financial services | 2023 |
| Broomco (2347) Limited | Professional & scientific | 1972 |
| Broomfield Private Day Nursery Limited | Health & social care | 2013 |
| Broomton 1970 Limited | Hospitality | 2024 |
| Brophy Castings Limited | Manufacturing | 2003 |
| Brotherhood Medical Services Ltd | Health & social care | 2014 |
| Brothers Distribution UK Ltd | Wholesale & retail | 2020 |
| Brothers in Maintenance Limited | Other services | 2026 |
| Brothers Team Ltd | Wholesale & retail | 2025 |
| Broughton Mart Limited | Wholesale & retail | 2018 |
| Brow Art & Beauty Limited | Other services | 2018 |
| Browart Hair & Beauty Salon Ltd | Administrative & support | 2022 |
| Brown COW Wyke Ltd | Hospitality | 2026 |
| Brown Muff Developments Limited | Construction | 2024 |
| Brownie Pointss Ltd | Hospitality | 2022 |
| Brownies Craftable Vinyls Ltd | Wholesale & retail | 2019 |
| Brownlee Leeds Ltd | Hospitality | 2016 |
| Brownroyd Properties Ltd | Real estate | 2025 |
| Brownsett Properties (BD) Limited | Real estate | 2024 |
| Brownsword Group Holdings Limited | Extraterritorial | 1989 |
| Brownsword Productions Limited | Extraterritorial | 1990 |
| Browntree Properties Limited | Real estate | 2002 |
| Brumfit Factory Equipment Limited | Manufacturing | 2002 |
| Brunch House Highgate Ltd | Hospitality | 2026 |
| Brunswick Properties (Halifax) Limited | Extraterritorial | 1970 |
| Brush and Brew Limited | Other services | 2025 |
| Brush Hour Ltd | Construction | 2021 |
| Brwni Limited | Hospitality | 2023 |
| Bryenna Limited | Real estate | 2013 |
| Bryker’S Vehicle Movements Ltd | Transport & logistics | 2025 |
| BS and SS Johal Ltd | Wholesale & retail | 2021 |
| BS Business Solutions Ltd | Wholesale & retail | 2021 |
| BS Events & Banqueting Ltd | Hospitality | 2022 |
| BS Foodco Ltd | Hospitality | 2021 |
| BS Group Holdings Ltd | Financial services | 2023 |
| BS Investmentsco Ltd | Real estate | 2021 |
| BS Laundry Services Ltd | Other services | 2023 |
| BS Onlineco Ltd | Wholesale & retail | 2021 |
| BS Retailco Ltd | Wholesale & retail | 2021 |
| BS Wholesaleco Ltd | Wholesale & retail | 2021 |
| BSA Building and Renovations Ltd | Construction | 2025 |
| BSA Health Care Ltd | Wholesale & retail | 2020 |
| BSA Training Limited | Education | 2025 |
| BSB Deliveries Ltd | Transport & logistics | 2025 |
| Bsce Ltd | Other services | 2024 |
| BSF Bradford Ltd | Hospitality | 2022 |
| BSG Management Services Ltd | Wholesale & retail | 2020 |
| BSH Intl Ltd | Wholesale & retail | 2023 |
| Bshl Limited | Extraterritorial | 2009 |