| BEN Joseph-Hukin Limited | Arts & recreation | 2025 |
| BEN Wood Studio Ltd | Professional & scientific | 2025 |
| BEN3FIT Limited | Wholesale & retail | 2021 |
| Benares Road Plumstead Ltd | Real estate | 2022 |
| Benben Ltd | Information & communication | 2001 |
| Bencapi Data Consulting Ltd | Information & communication | 2024 |
| Bench Technology Ltd | Information & communication | 2026 |
| Bencon Associates Limited | Professional & scientific | 2013 |
| Bend IT Films Limited | Information & communication | 2001 |
| Bend IT TV Limited | Information & communication | 2012 |
| Bendave Construction Ltd | Construction | 2024 |
| Benelita Ltd | Manufacturing | 2021 |
| Bengal Paradise (Herts) Limited | Hospitality | 2007 |
| Bengbis Business Jets Ltd | Transport & logistics | 2024 |
| Beni Civil Engineering Ltd | Professional & scientific | 2026 |
| Benison Family Practice Ltd | Health & social care | 2011 |
| Benison Private Limited | Real estate | 2024 |
| Benison Trading Limited | Real estate | 2018 |
| Benius Logistics Ltd | Transport & logistics | 2025 |
| Benjamin Reid Ltd | Information & communication | 2015 |
| Benjamin Roskams Limited | Wholesale & retail | 2013 |
| Benjamin Thomas Construction Ltd | Professional & scientific | 2017 |
| Benjamin Toms Photography Limited | Professional & scientific | 2010 |
| Benks Driving School Limited | Education | 2026 |
| Bennett Telemat Limited | Financial services | 2002 |
| Bennett's (Hackbridge) Limited | Extraterritorial | 1949 |
| Bennetts Interiors Limited | Construction | 2018 |
| Benny Refurbs Ltd | Households | 2015 |
| Benson Fine Art Limited | Wholesale & retail | 2019 |
| Benson Securities Limited | Financial services | 2018 |
| Bentley Snellings & Partners Limited | Professional & scientific | 1996 |
| Bentleys Leisure Ltd | Arts & recreation | 2010 |
| Beny Clearance Ltd | Water & waste | 2025 |
| Benz-Drive Ltd | Transport & logistics | 2025 |
| Berculeana Ltd | Administrative & support | 2024 |
| Berdan Supermarket Limited | Wholesale & retail | 2015 |
| Bergkhanhus Developments Ltd | Real estate | 2023 |
| Bergspyder Limited | Professional & scientific | 2024 |
| Berkeley Auto Ltd | Wholesale & retail | 2025 |
| Berkeley Estate (London) Ltd | Real estate | 2024 |
| Berkeley London Properties Limited | Real estate | 2018 |
| Berkeley Square (UK) Holdings Ltd | Real estate | 2025 |
| Berkley Carter Limited | Health & social care | 2011 |
| Berkley Taylor Limited | Construction | 2015 |
| Berks Homes Ltd | Real estate | 2021 |
| Bermuda House RTM Company Limited | Households | 2022 |
| Berry Ventures Limited | Financial services | 2023 |
| Berrybridge Advisors Limited | Wholesale & retail | 2023 |
| Berrycamp Ltd | Wholesale & retail | 2009 |
| Berrylands Printers Limited | Manufacturing | 1999 |
| Berrylands Property Ltd | Real estate | 2024 |
| Bertling Overseas Holdings Limited | Transport & logistics | 1990 |
| BES Marine Welding Ltd | Manufacturing | 2024 |
| Besk Limited | Administrative & support | 2018 |
| Besound Ltd | Professional & scientific | 2015 |
| Bespoke Components Limited | Construction | 2024 |
| Bespoke Diamond and Jewellery Ltd | Wholesale & retail | 2025 |
| Bespoke Garments UK Ltd | Manufacturing | 2016 |
| Bespoke Home Products Limited | Manufacturing | 2024 |
| Bespoke IT Systems Ltd | Information & communication | 2018 |
| Bespoke Kosher Travel Ltd | Administrative & support | 2011 |
| Bespoke Medical Care Limited | Health & social care | 2016 |
| Bespoke Medical Reports Ltd | Health & social care | 2021 |
| Bespoke Mortgages Ltd | Financial services | 2019 |
| Bespoke Solutions Direct Limited | Manufacturing | 2024 |
| Bespoke Structural Engineers Ltd | Professional & scientific | 2025 |
| Bespoke UK Logistics Ltd | Wholesale & retail | 2026 |
| Bespokescycletraining Ltd | Education | 2022 |
| Bessbrook Surveying Ltd | Administrative & support | 2017 |
| Best Beauty Limited | Other services | 2007 |
| Best Before Project | Water & waste | 2012 |
| Best Bloom Ltd | Real estate | 2026 |
| Best Build Developers Ltd | Construction | 2020 |
| Best Car Harrow Limited | Wholesale & retail | 2019 |
| Best Deep Carpet Cleaning Ltd | Administrative & support | 2026 |
| Best Jobs UK1 Ltd | Construction | 2015 |
| Best Medical Care Ltd | Health & social care | 2016 |
| Best Pro Inc. UK Ltd | Wholesale & retail | 2025 |
| Best Romanian Food Supermarket Ltd | Wholesale & retail | 2017 |
| Best Tech Consulting Limited | Extraterritorial | 2024 |
| Best Tech Solutions Limited | Wholesale & retail | 2026 |
| Best Tutors 4 U Limited | Education | 2014 |
| BEST2FIND UK Limited | Other services | 2013 |
| Bestbake Limited | Manufacturing | 2005 |
| Bestlines Limited | Real estate | 1982 |
| Besto Drinks Limited | Manufacturing | 2024 |
| Bestpound Ltd | Wholesale & retail | 2020 |
| Beta Diagnostics Ltd | Wholesale & retail | 2025 |
| Beta Freehold Consortium Limited | Real estate | 2017 |
| Beta Residents Association Limited | Households | 1986 |
| Beta Residents Freehold Limited | Real estate | 2017 |
| Beta Security Limited | Administrative & support | 1987 |
| Betalogic Ltd | Health & social care | 2023 |
| Betania Builders Limited | Construction | 2025 |
| Betaphotos Ltd | Professional & scientific | 2020 |
| Betax Accounting Ltd | Professional & scientific | 2016 |
| Betelgeuse Projects Limited | Information & communication | 2013 |
| Betex LLP | | 2005 |
| Bethel-Mountree UK Limited | Other services | 2015 |
| Betleem Limited | Administrative & support | 2007 |