| Brightbright.Pink UK Limited | Transport & logistics | 2026 |
| Brightek Limited | Administrative & support | 2019 |
| Brightfield Academy Ltd | Education | 2026 |
| Brighthill Futures Limited | Construction | 2021 |
| Brightlife Home Improvements Ltd | Construction | 2024 |
| Brightpath Care Services Ltd | Health & social care | 2025 |
| Brightpath Consulting Services Ltd | Information & communication | 2024 |
| Brightwater Enterprises Limited | Information & communication | 1998 |
| Brightwave Technologies Ltd | Wholesale & retail | 2025 |
| Brightwork Films Ltd | Extraterritorial | 2011 |
| Brijesh Technologies Ltd | Information & communication | 2012 |
| Briley Consultancy Group Limited | Professional & scientific | 2016 |
| Brilliant Accountants Ltd | Professional & scientific | 2015 |
| Brimwell Trade Limited | Wholesale & retail | 2025 |
| Brindley Spray Zone Ltd | Construction | 2025 |
| Brini Foods Limited | Hospitality | 2024 |
| Brinsden Builders (Hemel Hempstead) Limited | Real estate | 1976 |
| Brioche Pasquier U.K. Limited | Manufacturing | 2000 |
| Briscoe Properties Ltd | Real estate | 2022 |
| Bristol & London PLC | Administrative & support | 1998 |
| Bristol City Properties 2 Ltd | Real estate | 2016 |
| Bristol City Properties Ltd | Real estate | 2017 |
| Brit Books Limited | Wholesale & retail | 2009 |
| Brit DE Vere Limited | Real estate | 2016 |
| Brit Investments Limited | Real estate | 2016 |
| Britannia Auto Care UK Limited | Wholesale & retail | 2025 |
| Britannia Cloud Kitchen Ltd | Hospitality | 2026 |
| Britannia Emart Limited | Wholesale & retail | 2025 |
| Britannia Islamic School Ltd | Education | 2024 |
| Britasia NDT Limited | Professional & scientific | 2025 |
| Britbiztech Solutions Ltd | Information & communication | 2025 |
| Brite Advice Ltd | Wholesale & retail | 2010 |
| Briteclean Limited | Other services | 2011 |
| Brithome Furniture Supply Ltd | Wholesale & retail | 2026 |
| British Approvals Service for Cables Limited | Professional & scientific | 1973 |
| British Balboa Limited | Other services | 2024 |
| British Camelids Limited | Other services | 1988 |
| Britmove Limited | Transport & logistics | 2018 |
| Britronics Limited | Wholesale & retail | 2019 |
| Britsfly Ltd | Education | 2025 |
| Britsgo Ltd | Wholesale & retail | 2024 |
| Britzone Nutrition UK Limited | Wholesale & retail | 2022 |
| Brivoria Medical Limited | Health & social care | 2022 |
| Brixell Ltd | Wholesale & retail | 2025 |
| Brixies UK Limited | Wholesale & retail | 2026 |
| BRL Local Ltd | Wholesale & retail | 2024 |
| Brnstudio Ltd | Transport & logistics | 2020 |
| BRO Heat Ltd | Construction | 2018 |
| Bro-Tathan Limited | Energy | 2024 |
| Broadband Buyer Limited | Extraterritorial | 2008 |
| Broadfield Construction Consultancy Limited | Professional & scientific | 2019 |
| Broadleaf Solutions Ltd | Information & communication | 2015 |
| Broadway Loteza Ltd | Other services | 2018 |
| BROADWAY89 Limited | Real estate | 2020 |
| Brock PM Ltd | Professional & scientific | 2025 |
| Brokar Creative UK Limited | Professional & scientific | 2023 |
| Broker Desk Limited | Financial services | 2021 |
| Bromham Stores Limited | Wholesale & retail | 2006 |
| Bromoco Network Ltd | Construction | 2020 |
| Bromsgrove Schools SPV (Holdings) Limited | Financial services | 2005 |
| Bromsgrove Schools SPV Limited | Construction | 2005 |
| Bronze Park Resident Management Company Limited | Households | 2024 |
| Bronze Park (Apartments) Resident Management Company Limited | Households | 2024 |
| Bronze Valley Ltd | Wholesale & retail | 2024 |
| Brook Meadows Wixams Residents Management Company Limited | Households | 2024 |
| Brookdene Legal Services Limited | Professional & scientific | 2022 |
| Brooke Taylor Education Consultancy Ltd | Education | 2015 |
| Brookend Care Limited | Health & social care | 2024 |
| Brookfield-Jon Ltd | Administrative & support | 2017 |
| Brookfields (Stoke Hammond) Management Company Limited | Households | 2017 |
| Brookfields (Stoke Hammond) NO.2 Management Company Limited | Households | 2021 |
| Brooklands Construction Ltd | Construction | 2025 |
| Brooklands Holiday Lettings Limited | Real estate | 2025 |
| Brooklands House Freeholders Limited | Households | 2025 |
| Brooklands Properties and Management Ltd | Real estate | 2017 |
| Brooks Bryce Print Ltd | Manufacturing | 2018 |
| Brookside (Residents Association) Management Company Limited | Households | 2000 |
| Bros Handy Work Limited | Construction | 2020 |
| Brothers Auto Repair Ltd | Wholesale & retail | 2025 |
| Broughton Gate Food Centre Limited | Hospitality | 2019 |
| Broughton Plumbing Services Limited | Construction | 2008 |
| Broughton Premier Ltd | Wholesale & retail | 2022 |
| Broughton Road MK Limited | Construction | 2015 |
| Brow Bar Limited | Other services | 2012 |
| Brownbrogue Productions Ltd | Professional & scientific | 2024 |
| Brownes Group Ltd | Other services | 2021 |
| Brownlow Road Limited | Households | 2005 |
| Browns Tree Solutions Limited | Agriculture & fishing | 2019 |
| Browns Wood Services Ltd | Administrative & support | 2004 |
| Bro’S & Blades Barbers Ltd | Other services | 2026 |
| BRU77 Ltd | Professional & scientific | 2015 |
| Bruck Payne Associates Limited | Professional & scientific | 2002 |
| Brulary Ltd | Wholesale & retail | 2022 |
| Brulary Outdoors Ltd | Arts & recreation | 2023 |
| Brum Vision Ltd | Construction | 2024 |
| Brunel Accountancy Services Limited | Professional & scientific | 2024 |
| Brunel Group Holding Company Limited | Financial services | 2024 |
| Brunel House Walliscote Road Limited | Households | 2025 |
| Brunton Investments LLP | | 2022 |
| Bruton Pearce Limited | Professional & scientific | 1998 |