| Brightpath Financial Consulting Ltd | Professional & scientific | 2025 |
| Brightspot Marketing Ltd | Professional & scientific | 2020 |
| Brightwell Solutions Limited | Financial services | 2011 |
| Bril Limited | Real estate | 1989 |
| Brilliant Five Limited | Health & social care | 2015 |
| Brina House Ltd | Wholesale & retail | 2018 |
| Brique Ltd | Construction | 2021 |
| Bristol Craftworks Ltd | Other services | 2025 |
| Bristow Burrell Limited | Extraterritorial | 2016 |
| Brit-Link Cross Culture Ltd | Education | 2021 |
| Britannic Group (Holdings) Limited | Professional & scientific | 1985 |
| Britannic Technologies Limited | Information & communication | 1987 |
| Britannica Tours Ltd | Transport & logistics | 2012 |
| Britbuild Limited | Construction | 2005 |
| Britcast Limited | Wholesale & retail | 1996 |
| Brite Nest Ltd | Real estate | 2023 |
| Briter Bridges Ltd | Professional & scientific | 2018 |
| Britn Care Ltd | Health & social care | 2020 |
| Britton and Time Mediation Services Limited | Other services | 2020 |
| Broad Street Flowers Ltd | Wholesale & retail | 2018 |
| Broadstones Associates Limited | Professional & scientific | 2011 |
| Broadwater Safety Systems Limited | Construction | 2008 |
| Brocardo Ltd | Hospitality | 2020 |
| Brockham Badgers Football Club Limited | Arts & recreation | 2012 |
| Brodie and Sons Limited | Real estate | 2009 |
| Brodie Digital Ltd | Information & communication | 2019 |
| Brodie Group Limited | Construction | 1991 |
| Brodie Investments Limited | Real estate | 2014 |
| Brolyn Properties Limited | Construction | 2002 |
| Brompton Capital Assets Limited | Real estate | 2008 |
| Brompton Capital Management Limited | Real estate | 2009 |
| Bronlei Woods Management Ltd | Households | 2014 |
| Brook School Limited | Education | 2024 |
| Brookhampton Limited | Professional & scientific | 1999 |
| Brooklands Mansion Ltd | Construction | 2024 |
| Brookside (Southern) Holdings Limited | Financial services | 2021 |
| Brookside Management (Guildford) Limited | Real estate | 2009 |
| Broomleaf Associates Limited | Administrative & support | 2008 |
| Brown Alexander Limited | Information & communication | 2004 |
| Brown Cat Limited | Professional & scientific | 2011 |
| Brown Software Limited | Information & communication | 2019 |
| Browns Design & Build Limited | Construction | 2007 |
| Brunch Portsmouth Limited | Hospitality | 2024 |
| Brunch Solent Limited | Hospitality | 2024 |
| Brunswick Quay (22-26) Management Limited | Professional & scientific | 1986 |
| Brush Strokes II Limited | Administrative & support | 2015 |
| Bryant Mews Management Company Limited | Households | 2014 |
| Bryce Space and Technology Limited | Information & communication | 2018 |
| BSA EOT Trustees Limited | Professional & scientific | 2021 |
| BSB Engineering Ltd | Professional & scientific | 2024 |
| Btnx Ltd | Manufacturing | 2023 |
| Bts-Fleet (UK) Limited | Administrative & support | 2017 |
| Bttr Venture Studio Limited | Professional & scientific | 2020 |
| BTU Group Limited | Financial services | 2025 |
| BTU Holdings Limited | Financial services | 2022 |
| Bubble Foam Limited | Other services | 2018 |
| Bubblegum Surrey Ltd | Professional & scientific | 2023 |
| Bubblybathtime Ltd | Manufacturing | 2011 |
| Buckingham Court (Staines) Management Co. Limited | Households | 1987 |
| Buckingham Landscapes (UK) Limited | Administrative & support | 2003 |
| Buckthorn Biotech Limited | Wholesale & retail | 2025 |
| Buddies Enterprises Limited | Wholesale & retail | 2000 |
| BUG Beacon Ltd | Information & communication | 2025 |
| Build & Scape Ltd | Administrative & support | 2022 |
| Build Surrey Ltd | Construction | 2026 |
| Builders Connections Ltd | Construction | 2023 |
| Buildfolk Ltd | Construction | 2022 |
| Building Careers Limited | Extraterritorial | 2005 |
| Building Elite Ltd | Construction | 2017 |
| Buildingtown Ltd | Construction | 2024 |
| Built by Partners Ltd | Wholesale & retail | 2025 |
| Bukey Limited | Professional & scientific | 2019 |
| Bukon Ltd | Wholesale & retail | 2014 |
| Bulgarian Daisy Cleaning Ltd | Administrative & support | 2015 |
| Bullen Family Properties Limited | Hospitality | 2025 |
| Bunnergrove Limited | Households | 1973 |
| Burchett Holdings Limited | Real estate | 2025 |
| Burden & Associates Ltd | Professional & scientific | 2026 |
| Burden Consulting Limited | Professional & scientific | 2014 |
| Burdenshot Hill Estates Limited | Real estate | 1943 |
| Burgerkebab Co Ltd | Hospitality | 2025 |
| Burley Badger Ltd | Wholesale & retail | 2022 |
| Burmark Limited Liability Partnership | | 2024 |
| Burn After Filming Ltd | Information & communication | 2019 |
| Burneston House Dental Surgery Limited | Health & social care | 2008 |
| Burnet Digital Limited | Information & communication | 2016 |
| Burns London Ltd | Financial services | 2020 |
| Burpham Bluebell Property Ltd | Professional & scientific | 2026 |
| Burpham Construction Ltd | Construction | 2018 |
| Burpham Dental Practice Ltd | Health & social care | 2023 |
| Burpham Vets Ltd | Professional & scientific | 2025 |
| Burrito Loco Limited | Hospitality | 2014 |
| Burrows LEA Country House Limited | Health & social care | 2003 |
| Burton Agnes Renewables Limited | Energy | 2015 |
| Burton Drive Management Company Limited | Households | 1999 |
| Burwood Solutions Ltd | Construction | 2025 |
| Bury Hill Estate LLP | | 2026 |
| Bushi the Bull Limited | Real estate | 2019 |
| Business Arch Expertise Ltd | Information & communication | 2010 |
| Business Engineering Limited | Professional & scientific | 2024 |