| Boyraz Tutoring & Consultancy Ltd | Education | 2020 |
| BP Learning UK | Education | 2017 |
| BP Mechanical Solutions Limited | Administrative & support | 2014 |
| BPP General Traders Ltd | Wholesale & retail | 2021 |
| Bpsd Limited | Information & communication | 2008 |
| Br-Newlife Limited | Financial services | 2018 |
| BR0WS & Nails Limited | Other services | 2019 |
| BRA Sense Limited | Wholesale & retail | 2003 |
| Bracken Engineering Ltd | Wholesale & retail | 2020 |
| Brackenfield Developments Ltd | Construction | 2013 |
| Brackenyx Property Holdings Ltd | Extraterritorial | 2026 |
| Brackwood Leisure Ltd | Hospitality | 2020 |
| Bradbury Property Services Ltd | Real estate | 2022 |
| Bradley and James Garden Design & Build Ltd | Professional & scientific | 2026 |
| Bradley and James Garden Design & Landscaping Ltd | Professional & scientific | 2020 |
| Bradley Cleaning Services Ltd | Administrative & support | 2023 |
| Bradley Knipe Ltd. | Wholesale & retail | 2004 |
| Bradshaw Butchers Limited | Wholesale & retail | 2010 |
| Bradwell (Belton) Holdings Limited | Financial services | 2010 |
| Bradwell (Belton) Limited | Transport & logistics | 2001 |
| Braeburn Motors Ltd | Wholesale & retail | 2025 |
| Braemar Engineering Ltd | Professional & scientific | 2011 |
| Braga Spedition Ltd | Transport & logistics | 2017 |
| Braggott Homes Limited | Construction | 1991 |
| Braggott Property Investments Ltd | Real estate | 2016 |
| Braham PH Ltd | Construction | 2025 |
| Braham Plumbing & Heating Ltd | Construction | 2019 |
| Brahms-Sd Limited | Wholesale & retail | 2013 |
| Braighttext Ltd | Information & communication | 2025 |
| Brailsford & Burns Limited | Information & communication | 2023 |
| Braim Logistics Ltd | Transport & logistics | 2022 |
| Brain in Gear Education Ltd | Education | 2021 |
| Braitransport Ltd | Transport & logistics | 2018 |
| Bramble & Bolt Limited | Extraterritorial | 2026 |
| Brambleforge Ltd | Extraterritorial | 2026 |
| Brambles Belton Limited | Real estate | 2018 |
| Brambles Group Limited | Professional & scientific | 2022 |
| Brambles Property Limited | Real estate | 2024 |
| Brameld Construction Limited | Construction | 2003 |
| Brammall Power Limited | Construction | 2025 |
| Bramwith Hall Estates Limited | Agriculture & fishing | 2016 |
| Bramwith Machining Ltd | Manufacturing | 2021 |
| Bran&Company UK Ltd | Transport & logistics | 2023 |
| Brand Pizza Limited | Hospitality | 2025 |
| Brandbyte Ltd | Manufacturing | 2025 |
| Brandestiny Ltd | Information & communication | 2025 |
| Brandix Ltd | Administrative & support | 2024 |
| Brandon Griffiths TM Ltd | Public administration | 2024 |
| Brandon Wheeler Tree Surgeries Limited | Agriculture & fishing | 2018 |
| Brandopp Ltd | Professional & scientific | 2025 |
| Brandpremiums Ltd | Wholesale & retail | 2025 |
| Brands in Holdings Limited | Financial services | 2025 |
| Brands in Limited | Wholesale & retail | 2012 |
| Brandt Industries Ltd | Financial services | 2018 |
| Branton Knight Limited | Wholesale & retail | 1995 |
| Brason Transport Limited | Transport & logistics | 2009 |
| Bratislava Mini Market Limited | Wholesale & retail | 2025 |
| Brave Planet Media Ltd | Information & communication | 2012 |
| Bravechase Services Limited | Information & communication | 1990 |
| Bravion Works Ltd | Extraterritorial | 2026 |
| Bravo Cleopatra Cafe Limited | Hospitality | 2024 |
| Brayan Cleaning Ltd | Administrative & support | 2026 |
| Braymore Ltd | Transport & logistics | 2025 |
| Bread Club Limited | Other services | 2015 |
| Bread N Bake Limited | Wholesale & retail | 2025 |
| Breakdown Buddy Limited | Wholesale & retail | 2025 |
| Breaking Beats Ltd | Education | 2014 |
| Breakthrough Educational Psychology Limited | Education | 2022 |
| Breazu Limited | Construction | 2025 |
| Breck Gardens Facilities Management Ltd | Administrative & support | 2022 |
| Bree FOX Ltd | Education | 2023 |
| Breeze Power Ltd | Energy | 2012 |
| Brent Goodwin Associates Ltd | Professional & scientific | 2010 |
| Brentay Logistics Ltd | Transport & logistics | 2023 |
| Brenton & Chase Ltd | Extraterritorial | 2026 |
| Bret Ltd | Professional & scientific | 2013 |
| Brett Health Ltd | Health & social care | 2019 |
| Brewster Builder Ltd | Manufacturing | 2020 |
| BRF Logistics Limited | Transport & logistics | 2019 |
| BRG Utilities Ltd | Construction | 2024 |
| BRH Consultants Ltd | Professional & scientific | 2017 |
| BRH Property Limited | Real estate | 2008 |
| Brian Butcher Financial Planning Ltd | Other services | 2011 |
| Brian Shenton Site Engineering Services Limited | Construction | 2007 |
| Briardene Assets Limited | Real estate | 2019 |
| Brick Street Ltd | Real estate | 2020 |
| Brickaart Ltd | Construction | 2025 |
| Brickcoffee Limited | Manufacturing | 2025 |
| Brickhunter EOT Limited | Extraterritorial | 2023 |
| Brickhunter Limited | Wholesale & retail | 2004 |
| Brickkickers Ltd | Other services | 2023 |
| Bridge ARC Solutions Ltd | Administrative & support | 2025 |
| Bridge ARC Support Ltd | Administrative & support | 2025 |
| Bridge END Pizza Ltd | Wholesale & retail | 2013 |
| Bridge Pizza Ltd | Hospitality | 2026 |
| Bridge Side Building Supplies Ltd | Wholesale & retail | 2025 |
| Bridge Street Barns Limited | Real estate | 2023 |
| Bridgelink Advisory Limited | Other services | 2024 |
| Bridgets Bambinos Day Nursery Limited | Health & social care | 2021 |
| Bridgett Conservation (Building Restoration) Limited | Construction | 2013 |