| Brenco Ltd | Extraterritorial | 2017 |
| Brentwood Auto Spares Limited | Wholesale & retail | 1991 |
| Brentwood Curry HUT Ltd | Hospitality | 2019 |
| Brentwood SUB Ltd | Hospitality | 2015 |
| Brenwick Security Ltd | Administrative & support | 2026 |
| Brett Biggar IT Solutions Limited | Information & communication | 2018 |
| Brew Bazaar Limited | Hospitality | 2025 |
| Brewin Dolphin Portfolio Managers Limited | Real estate | 2017 |
| BRI Base Ltd | Construction | 2023 |
| BRI BOA Ltd | Wholesale & retail | 2023 |
| BRI Trans Limited | Transport & logistics | 2020 |
| Brian Thomas Estate Agents Limited | Real estate | 2012 |
| Briarbridge Healthcare Limited | Health & social care | 2017 |
| Briarbridge Limited | Wholesale & retail | 2011 |
| Brick and Construct Ltd | Construction | 2021 |
| Brick Lane Tandoori Limited | Hospitality | 2022 |
| Brick Square Ltd | Real estate | 2019 |
| Bricks Tower Construction Ltd | Construction | 2020 |
| Bricksecurity Ltd | Administrative & support | 2024 |
| Brickway Construction Ltd | Construction | 2023 |
| Brickz Investments Ltd | Real estate | 2025 |
| Briclogix Technologies Ltd | Information & communication | 2024 |
| Brictemple Limited | Real estate | 2019 |
| Bridge & Bloom House Ltd | Wholesale & retail | 2026 |
| Bridge Digital Europe Limited | Information & communication | 2025 |
| Bridge House 3D-AESTHETICS Ltd | Extraterritorial | 2020 |
| Bridge House Ilford Ltd | Other services | 2022 |
| Bridge in Ltd | Real estate | 2024 |
| Bridge India Think Tank Ltd | Professional & scientific | 2023 |
| Bridge Legal Recruitment Ltd | Administrative & support | 2026 |
| Bridgecommerce Partners Ltd | Wholesale & retail | 2025 |
| Bridgestrike Ltd | Manufacturing | 2016 |
| Brig Bilquies Ltd | Real estate | 2023 |
| Bright & Beautiful Properties Ltd | Real estate | 2024 |
| Bright & Grace Limited | Professional & scientific | 2021 |
| Bright Cloud Solutions Limited | Information & communication | 2021 |
| Bright Digital Group Ltd | Professional & scientific | 2026 |
| Bright Door Properties Ltd | Real estate | 2025 |
| Bright Double Glazing Ltd | Manufacturing | 2023 |
| Bright Education Consultants Limited | Education | 2026 |
| Bright Hearts Care Ltd | Extraterritorial | 2023 |
| Bright Homes Construction Ltd | Construction | 2020 |
| Bright House Energy Limited | Construction | 2023 |
| Bright Land London Ltd | Wholesale & retail | 2012 |
| Bright Sanctum Ltd | Public administration | 2026 |
| Bright Spark Enterprises Ltd | Professional & scientific | 2017 |
| Bright Star Day Nursery Limited | Education | 2012 |
| Bright Star Malik Ltd | Wholesale & retail | 2025 |
| Bright Steps Holdings Limited | Real estate | 2026 |
| Bright Steps Nursery Ltd | Health & social care | 2026 |
| Bright Sun Properties Limited | Real estate | 2024 |
| Bright Training Ltd | Education | 2015 |
| Brightcareer UK Ltd | Education | 2024 |
| Brighter Way House Ltd | Hospitality | 2026 |
| Brighter Way Services Ltd | Administrative & support | 2026 |
| Brightest Properties Limited | Real estate | 2020 |
| Brightgrid Ltd | Wholesale & retail | 2024 |
| Brighthill College Ltd | Education | 2024 |
| Brighthub Capital Ltd | Professional & scientific | 2024 |
| Brightly Stars Limited | Real estate | 2023 |
| Brightmate Ltd | Real estate | 2022 |
| Brightnest Childcare Ltd | Health & social care | 2025 |
| Brightnest Haven Limited | Health & social care | 2025 |
| Brightrend Ltd | Professional & scientific | 2016 |
| Brightscale Marketing Ltd | Professional & scientific | 2025 |
| Brightstar Care Hub Ltd | Health & social care | 2023 |
| Brightstar Care Limited | Health & social care | 2022 |
| Brightstone Academy Ltd | Education | 2021 |
| Brightwork Pro Ltd | Construction | 2018 |
| Briliant Services 93 Ltd | Water & waste | 2021 |
| Brilliant Brains Tuition Centre Ltd | Education | 2022 |
| Brilliant Buy Limited | Wholesale & retail | 2023 |
| Brilliant Cafe Restaurant Ltd | Hospitality | 2011 |
| Brilliant Wood Flooring Ltd | Construction | 2013 |
| Brilora Limited | Administrative & support | 2025 |
| Brimstone Digital Ltd | Information & communication | 2024 |
| Brimz & Trimz Ltd | Other services | 2025 |
| Brinso Ltd | Wholesale & retail | 2025 |
| Brisa Consultants UK Ltd | Professional & scientific | 2025 |
| Brisbane Acquisition (London) Ltd | Real estate | 2019 |
| Brisbane S&Y Limited | Real estate | 2023 |
| Bristol JB Ltd | Hospitality | 2026 |
| Brit Care Services Ltd | Administrative & support | 2025 |
| Brit Driver Ltd | Education | 2026 |
| Brit Fintech Awards Limited | Administrative & support | 2024 |
| Brit Locums Limited | Administrative & support | 2015 |
| Brit Prime Ltd | Extraterritorial | 2025 |
| Brit Resourcing Consultancy Ltd | Administrative & support | 2024 |
| Brit Union Picks Ltd | Wholesale & retail | 2025 |
| Brit Windows Limited | Manufacturing | 2018 |
| Britania Accountants and Tax Adviser Limited | Professional & scientific | 2019 |
| Britania Care Limited | Health & social care | 2024 |
| Britania Estates Limited | Real estate | 2026 |
| Britannia Business Press Limited | | 1988 |
| Britannia Fostering Agency Limited | Health & social care | 2019 |
| Britannia Halal Meat Limited | Wholesale & retail | 2019 |
| Britannia Heating and Construction Limited | Construction | 2025 |
| Britannia Heating Solutions Ltd | Construction | 2013 |
| Britannia Solicitors Ltd | Professional & scientific | 2014 |
| Britannica Management and Consultancy Limited | Information & communication | 2022 |