| Bourlion Limited | Real estate | 1993 |
| BOW Projects Limited | Construction | 2024 |
| Bowman Court RTM Company Limited | Households | 2013 |
| Boxalls Lane Limited | Real estate | 2020 |
| Boxxstep Ltd | Extraterritorial | 2016 |
| Boyce Publishing Ltd | Wholesale & retail | 2024 |
| Boyer Audio Limited | Financial services | 2016 |
| Boysie Properties F3 Ltd | Real estate | 2025 |
| Boysie Properties GF Ltd | Real estate | 2025 |
| Boysie Properties Ltd | Real estate | 2025 |
| BP Wealth Ltd | Extraterritorial | 2016 |
| BP Wealth Management Limited | Financial services | 2015 |
| Bradborn Shelley Holdings Ltd | Real estate | 2026 |
| Bradborn Shelley Ltd | Information & communication | 2026 |
| Bradbourne Management Consultancy Ltd | Administrative & support | 2010 |
| Branch Technologies Ltd | Construction | 2026 |
| Branching OUT Arboriculture Ltd | Administrative & support | 2025 |
| Brand Eyewear Ltd | Wholesale & retail | 2016 |
| Brandlines Limited | Wholesale & retail | 2009 |
| Brather Ltd | Information & communication | 2025 |
| Bravewater Trading Limited | Wholesale & retail | 2022 |
| Bravura Contractors Limited | Construction | 2010 |
| Braybrooke Investments (Weymouth) Limited | Construction | 2019 |
| Brayside Securities Limited | Real estate | 1991 |
| Brazier Building Solutions Ltd | Construction | 2009 |
| Brdsim Ltd | Manufacturing | 2006 |
| Breaking Hundred Circle CIC | Professional & scientific | 2024 |
| Breathe HR Ltd | Extraterritorial | 2020 |
| Bretson Limited | Construction | 1991 |
| Brewed by Hand Ltd | Hospitality | 2011 |
| Brewer and Baker Limited | Hospitality | 2023 |
| Brickmongers (London) Ltd | Wholesale & retail | 2020 |
| Brickmongers Ltd | Wholesale & retail | 2002 |
| Brickyard Way Ltd | Real estate | 2023 |
| Bridge Over the Yangtze Ltd | Hospitality | 2015 |
| Bridges Place Management Company Limited | Households | 2006 |
| Bridgestone House Management Limited | Households | 2007 |
| Bright Aviation Limited | Wholesale & retail | 2020 |
| Bright Kitty CIC | Education | 2022 |
| Bright Solutions Limited | Construction | 2023 |
| Bright Square Pensions Limited | Financial services | 2017 |
| Brighter Care Solutions Ltd | Administrative & support | 2017 |
| Brighton Coaches Limited | Transport & logistics | 1995 |
| Brit Roots LLP | | 2024 |
| Britannia Recruitment Limited | Professional & scientific | 2006 |
| Britannia Research Ltd | Financial services | 2022 |
| Britchiro Horsham Ltd | Health & social care | 2013 |
| British Ensign Golf Ltd. | Arts & recreation | 2004 |
| British Ensign Holdings Ltd. | Real estate | 2009 |
| British Ensign Investments Limited | Real estate | 1992 |
| British Ensign Limited | Financial services | 2018 |
| British Lawnmower Racing Association Limited(The) | Arts & recreation | 1985 |
| Britweb Ltd | Information & communication | 2007 |
| Britweb Properties Ltd | Real estate | 2019 |
| Broadbridge Cafe Ltd | Hospitality | 2026 |
| Broadbridge Heath Football Club Limited | Arts & recreation | 2018 |
| Broadbridge Heath Garage Limited | Wholesale & retail | 2012 |
| Broadcast Decisions Limited | Financial services | 1999 |
| Broadheart Ltd | Financial services | 2021 |
| Broadoak Services Limited | Wholesale & retail | 2006 |
| Broadview Children’S Homes Limited | Health & social care | 2025 |
| Broadview Children’S Properties Limited | Real estate | 2025 |
| Broadway Court Limited | Households | 1983 |
| Brock Taylor Limited | Real estate | 2007 |
| Brockham Park House Management Limited | Households | 2002 |
| Brockham Park Residents Management Company Limited | Households | 2001 |
| Brodia Services Limited | Administrative & support | 1922 |
| Brolly Brewing Limited | Manufacturing | 2016 |
| Bromas Consulting Limited | Information & communication | 2012 |
| Bronzewood Limited | Professional & scientific | 2026 |
| Brook Care Ltd | Administrative & support | 2024 |
| Brookhouse Knepp Limited | Agriculture & fishing | 1997 |
| Brooklands Advice Services Ltd | Financial services | 2017 |
| Brooks Communications Ltd | Professional & scientific | 2026 |
| Brooks IT Consultancy Ltd. | Information & communication | 2015 |
| Brookton Ltd | Real estate | 2017 |
| Brown Bear Digital Ltd | Information & communication | 2016 |
| Browns Kitchen Limited | Hospitality | 2012 |
| Brush Expert Limited | Administrative & support | 2000 |
| Bryant Family Holdings Ltd | Real estate | 2019 |
| Bryant Family Partnership LLP | | 2019 |
| Bryenergy Services Limited | Professional & scientific | 2009 |
| Bsaf Property Limited | Real estate | 2024 |
| BSI Investments Limited | Administrative & support | 2005 |
| Bsrm Consulting Ltd | Construction | 2024 |
| Bsure Property Renovations Ltd | Construction | 2022 |
| Bubberts Ltd | Other services | 2025 |
| Bubble & Co UK Limited | Wholesale & retail | 2025 |
| Bubbuh Ltd | Wholesale & retail | 2017 |
| Bucksgreen Holdings Limited | Real estate | 2016 |
| Budwell Limited | Extraterritorial | 1998 |
| Bugeye Ltd | Information & communication | 2026 |
| Bugterfig Ltd | Information & communication | 2025 |
| Buildfore Ltd | Construction | 2025 |
| Building & Property Maintenance Consultants Limited | Professional & scientific | 2012 |
| Building Risk Management (London) Ltd | Professional & scientific | 2021 |
| Buildstreams Software Limited | Information & communication | 2026 |
| Bullard Investment Ltd | Administrative & support | 2011 |
| Bulldog Broadband Limited | Information & communication | 2012 |
| Bumble Rock Ltd | Wholesale & retail | 2026 |