| Bricks & Bolts Leasing Limited | Administrative & support | 2025 |
| Brickwork TL Ltd | Construction | 2022 |
| Bridge and Belong Community Interest Company | Health & social care | 2026 |
| Bridge Care and Serivces Ltd | Hospitality | 2022 |
| Bridge House Farm Limited | Agriculture & fishing | 1958 |
| Bridge Resources Limited | Professional & scientific | 2007 |
| Bridge Substance Misuse Programme CIC | Health & social care | 2007 |
| Bridgej Ltd | Information & communication | 2025 |
| Bridges Espresso Bar Ltd | Hospitality | 2019 |
| Bridgeway Solution Social Care Services Limited | Public administration | 2025 |
| Brigadier House RTM Company Ltd | Households | 2015 |
| Briggs & Forrester (UK) Limited | Professional & scientific | 2016 |
| Briggs & Forrester Energy Ltd | Construction | 2011 |
| Briggs & Forrester Engineering Limited | Construction | 2012 |
| Briggs & Forrester Group Limited | Professional & scientific | 2001 |
| Briggs & Forrester Limited | Professional & scientific | 2006 |
| Brighis Transport Ltd | Transport & logistics | 2025 |
| Brighouse Dental Team Limited | Health & social care | 2013 |
| Brighouse Homes (Wilmslow) Limited | Construction | 2008 |
| Bright & Fisher Brickwork Limited | Construction | 2024 |
| Bright Basket Ltd | Wholesale & retail | 2025 |
| Bright Cart Limited | Wholesale & retail | 2025 |
| Bright Collective Ltd | Other services | 2023 |
| Bright Components Limited | Wholesale & retail | 2013 |
| Bright Connections Limited | Wholesale & retail | 2003 |
| Bright Cottage Housekeeping Ltd | Administrative & support | 2024 |
| Bright Horizons Family Solutions Limited | Education | 1988 |
| Bright Horizons Foundation for Children (UK) | Education | 2005 |
| Bright Power Limited | Extraterritorial | 2016 |
| Bright Prism Limited | Professional & scientific | 2014 |
| Bright Reporting Limited | Health & social care | 2018 |
| Bright Spark LX Limited | Information & communication | 2023 |
| Bright Start Rides Ltd | Transport & logistics | 2026 |
| Bright-Line Consulting Ltd | Information & communication | 2016 |
| Brightbabies Limited | Manufacturing | 2023 |
| Brightcloud Technologies Limited | Information & communication | 2000 |
| Brighter Smiles Care Ltd | Health & social care | 2025 |
| Brightermoon Ltd | Financial services | 2019 |
| Brightline Laser Repair Limited | Wholesale & retail | 2025 |
| Brightreys Ltd | Health & social care | 2009 |
| Brightside Landscapes Limited | Administrative & support | 2025 |
| Brightspace Events Ltd. | Administrative & support | 2015 |
| Brightwell Consulting Ltd. | Information & communication | 2010 |
| Brightwise Cleaning Limited | Administrative & support | 2006 |
| Brill Power Limited | Professional & scientific | 2016 |
| Brilliant Hands Ltd | Wholesale & retail | 2018 |
| Brilliant Restaurant Limited | Hospitality | 2023 |
| Brindle & Vale Ltd | Professional & scientific | 2025 |
| Bringatrailer Limited | Transport & logistics | 2011 |
| Brington Green Developments Ltd | Construction | 2023 |
| Brington Properties Ltd | Households | 2015 |
| Brington PUB Co Ltd | Hospitality | 2024 |
| Brit Food Worldwide Ltd | Wholesale & retail | 2016 |
| Britaliamoto Limited | Wholesale & retail | 2009 |
| Britanic Cabling Production Limited | Manufacturing | 2020 |
| Britanica Limited | Professional & scientific | 2020 |
| Britannia Explorers Ltd | Administrative & support | 2025 |
| Britannic Leatherwear Limited | Wholesale & retail | 1955 |
| Briti AI Ltd | Information & communication | 2024 |
| British Cleaning Council Ltd | Other services | 1987 |
| British Footwear Association Limited | Other services | 1898 |
| British Institute of Cleaning Science Limited(The) | Administrative & support | 1980 |
| British Institute of Non-Destructive Testing(The) | Professional & scientific | 1969 |
| British Naturism | Other services | 2010 |
| British Steam Specialties (International) Limited(The) | Extraterritorial | 1960 |
| Britken Graphics Limited | Wholesale & retail | 2016 |
| Briton Building & Services Limited | Construction | 1992 |
| Britsmart Solutions Ltd | Professional & scientific | 2024 |
| Brittax Accountancy Ltd | Extraterritorial | 2026 |
| Britten Brickwork Ltd | Construction | 2025 |
| Britten Property Developments Ltd | Real estate | 2025 |
| Briway Direct Ltd | Wholesale & retail | 2018 |
| Briway Energy Ltd | Wholesale & retail | 2024 |
| Briway Estates Ltd | Real estate | 2022 |
| Briway Flavors and Fragrances Ltd | Wholesale & retail | 2019 |
| Briway Home CIC | Professional & scientific | 2024 |
| Briway Investment Ltd | Financial services | 2017 |
| Briway Lettings and Property Management Ltd | Real estate | 2018 |
| Briway Management Ltd | Financial services | 2017 |
| Briway Talent Ltd | Administrative & support | 2025 |
| Briway Tech Limited | Wholesale & retail | 2007 |
| Brix Aviation Limited | Manufacturing | 2022 |
| Brix Secure Ltd | Administrative & support | 2003 |
| Brixen Search Limited | Administrative & support | 2026 |
| Brixton E Foods Ltd | Hospitality | 2019 |
| Brixtone Developments Ltd | Construction | 2026 |
| Brixworth Brewery Company Ltd | Extraterritorial | 2018 |
| Brixworth Cricket Club Limited | Arts & recreation | 2008 |
| Brixworth Engineering Company Limited(The) | Manufacturing | 1965 |
| Brixworth Farming Company Limited | Agriculture & fishing | 2000 |
| Brixworth Hand Car Wash Ltd | Other services | 2024 |
| Brixworth Legal Limited | Professional & scientific | 2017 |
| Brixworth Local Ltd | Wholesale & retail | 2020 |
| Brixworth Properties Limited | Real estate | 2014 |
| Brixworth Tandoori Takeaway Ltd | Hospitality | 2016 |
| Brixworth Technology Park Freehold Limited | Real estate | 2014 |
| Brixworth Valeting Services Ltd | Other services | 2021 |
| Brixworth Wills Limited | Other services | 2017 |
| BRL Padel Ltd | Arts & recreation | 2026 |
| Brndlab Agency LLP | | 2026 |