| Bridge Farm Renewable Energy Limited | Energy | 2023 |
| Bridge House Dwellings Ltd | Real estate | 2018 |
| Bridge Investments Reading Ltd | Construction | 2026 |
| Bridge Service Garage (Windsor) Limited | Wholesale & retail | 1962 |
| Bridgeconsult Ltd | Professional & scientific | 2018 |
| Bridgehouse Corporate Services Limited | Administrative & support | 2025 |
| Bridgemark Properties Ltd | Real estate | 2026 |
| Bridgemark Systems Ltd | Information & communication | 2026 |
| Bridgemile Limited | Professional & scientific | 2007 |
| Bridges Caversham Limited | Real estate | 1999 |
| Bridges Home Care Limited | Health & social care | 2013 |
| Bridges Home Cleaning Ltd | Administrative & support | 2016 |
| Bridges International Ltd | Wholesale & retail | 2025 |
| Bridgetheglobe Limited | Information & communication | 2013 |
| Bridgethorne Limited | Wholesale & retail | 1997 |
| Bridgewater Distribution Group Limited | Financial services | 2026 |
| Bridgeway & Co Solutions Limited | Administrative & support | 2025 |
| Bridging Estate Ltd | Real estate | 2020 |
| Bridging Estate Service Ltd | Real estate | 2020 |
| Bridging the Future Ltd | Real estate | 2022 |
| Bridging the GAP Films Ltd | Information & communication | 2023 |
| Briefed Communications Ltd | Professional & scientific | 2025 |
| Brieya Services Ltd. | Real estate | 2023 |
| Bright and Beauty Limited | Wholesale & retail | 2013 |
| Bright Blue Marketing Limited | Professional & scientific | 2004 |
| Bright Ideas (UK) Ltd | Extraterritorial | 2008 |
| Bright Services Limited | Health & social care | 2018 |
| Bright Sons PVT Ltd | Health & social care | 2021 |
| Bright Sparks Education Limited | Education | 2022 |
| Bright-E Limited | Wholesale & retail | 2011 |
| Brightbox Properties Ltd | Real estate | 2021 |
| Brighter Beginnings Care Ltd | Health & social care | 2023 |
| Brighter Futures for Children Limited | Public administration | 2018 |
| Brighter Grounds Ltd | Wholesale & retail | 2025 |
| Brighter Life Therapy Ltd | Health & social care | 2020 |
| Brighter Steps Limited | Health & social care | 2016 |
| Brighter Steps Property Ltd | Real estate | 2023 |
| Brighter Steps Residential Limited | Health & social care | 2024 |
| Brightgtm Ltd | Professional & scientific | 2025 |
| Brighthurst Limited | Real estate | 2018 |
| Brightink Communications Limited | Professional & scientific | 2020 |
| Brightlife Care Ltd | Health & social care | 2025 |
| Brightlife Care Services Ltd | Health & social care | 2024 |
| Brighton Place RTM Company Limited | Households | 2026 |
| Brighton Road DE24 Ltd | Real estate | 2021 |
| Brighton's Newsagents Limited | Wholesale & retail | 2022 |
| Brightpath Transport Limited | Other services | 2025 |
| Brightspark Consultants Limited | Professional & scientific | 2018 |
| Brightwell House Management Company Limited | Households | 2018 |
| Brigtech Limited | Construction | 1986 |
| Brij Realty Ltd | Real estate | 2022 |
| Briki Ltd | Hospitality | 2014 |
| Brillant 3333. UK Limited | Information & communication | 2021 |
| Brilliant Brands Hub Ltd | Wholesale & retail | 2015 |
| Brilliant Bright Limited | Professional & scientific | 2024 |
| Brilliant Consultant Ltd | Professional & scientific | 2025 |
| Brilliant Serviced Accommodation Ltd | Real estate | 2019 |
| Brilliant Tutors Ltd | Information & communication | 2025 |
| Brim Hydration Ltd | Manufacturing | 2026 |
| Brimpton Flying Group Limited | Arts & recreation | 2003 |
| Brimz Financials Ltd | Professional & scientific | 2020 |
| Bring That Beat Back Limited | Information & communication | 2025 |
| Brink Wellness Limited | Hospitality | 2026 |
| Brinus Tech Ltd | Information & communication | 2021 |
| Brisegene Care Ltd | Health & social care | 2018 |
| Brit Fantasy SOC Ltd | Arts & recreation | 2017 |
| Brit Mobile Tyres Ltd | Manufacturing | 2025 |
| Brit Tech Solutions Ltd | Information & communication | 2022 |
| Britalba Investment Limited | Real estate | 2023 |
| Britalba Ltd | Wholesale & retail | 2010 |
| Britannia Corporate Training Centre Ltd | Administrative & support | 2025 |
| Britannia Investmentz Ltd | Professional & scientific | 2025 |
| Britannia Pharmaceuticals Limited | Wholesale & retail | 1981 |
| Britasia Limited | Professional & scientific | 2017 |
| Brite Energy Ltd | Construction | 2015 |
| Britewave Management Ltd | Professional & scientific | 2024 |
| British Chinese Artists Association | Arts & recreation | 2011 |
| British Dyslexia Association | Education | 1984 |
| British Franchise Association | Other services | 1977 |
| Briton Cars Ltd | Wholesale & retail | 2024 |
| Brits Airport Cars Ltd | Transport & logistics | 2025 |
| Brits Global Education Limited | Administrative & support | 2025 |
| Brits Motors Ltd | Wholesale & retail | 2023 |
| Britt Ecom Ltd | Wholesale & retail | 2024 |
| Britton Ductwork Services Ltd | Construction | 2021 |
| Brituswip Limited | Wholesale & retail | 2015 |
| Britwell Enterprises Ltd | Financial services | 2023 |
| BRO Spedition Ltd | Transport & logistics | 2025 |
| BRO Trading and Services Ltd | Health & social care | 2015 |
| Broadband Wherever Limited | Information & communication | 2006 |
| Broadcast Media & Systems Engineering Ltd | Information & communication | 2013 |
| Broadcastime Limited | Information & communication | 2021 |
| Broadcom Europe Limited | Professional & scientific | 2000 |
| Broadpark Services Ltd | Hospitality | 2024 |
| Broadreach Business Consulting Ltd | Professional & scientific | 2025 |
| Broadstage Live Ltd | Arts & recreation | 2025 |
| Broadstone Mead Management Company Ltd | Households | 2011 |
| Broadwater Homes Limited | Real estate | 2013 |
| Brock Gardens Management Company Limited | Real estate | 1987 |
| Brock Solutions UK Limited | Professional & scientific | 2017 |