| Bavalal Investment Ltd | Real estate | 2026 |
| Baverstock Construction Ltd | Construction | 2023 |
| Baxter House Residents Company Limited | Real estate | 2004 |
| Baydee Traders Limited | Wholesale & retail | 2016 |
| Bayham Street Management Co Ltd | Real estate | 2011 |
| Baynaan Ltd | Transport & logistics | 2019 |
| BAZ Outsource UK Ltd | Information & communication | 2019 |
| BB Bronze 2U Ltd | Other services | 2022 |
| Bb-Mrp Limited | Professional & scientific | 2016 |
| BC Cargo Ltd | Transport & logistics | 2018 |
| Bcube Groups Ltd | Hospitality | 2025 |
| BDB Logistics Ltd | Transport & logistics | 2014 |
| BDH Building Services Ltd | Construction | 2023 |
| Bdogg Productions Ltd | Information & communication | 2024 |
| BDU Building Services Limited | Construction | 2017 |
| BE Active Sports & Clubs Limited | Education | 2020 |
| Beacon Care Holdings Limited | Professional & scientific | 1996 |
| Beacon Care Investments Limited | Professional & scientific | 2002 |
| Beacon Care Limited | Health & social care | 1996 |
| Beaconsfield Mews Management Limited | Real estate | 1988 |
| Beames Solutions Limited | Administrative & support | 2016 |
| Beaufort 4 Limited | Real estate | 2009 |
| Beaumont House Ltd | Information & communication | 2025 |
| Beauticious Bronze Limited | Other services | 2016 |
| Beauty by Mannat Ltd | Other services | 2022 |
| BEAUTY4YOU Limited | Other services | 2007 |
| Beaverstock Finance Ltd | Professional & scientific | 2018 |
| Because Eyecare Limited | Professional & scientific | 2015 |
| Becondale House Limited | Information & communication | 2009 |
| Becosh Ltd | Health & social care | 2024 |
| Bedborough Limited | Construction | 2012 |
| Bedi Properties Ltd | Real estate | 2026 |
| Bedre and Bedre Limited | Professional & scientific | 2023 |
| Beech Care Limited | Health & social care | 2000 |
| Beechfield (Management) Company Limited | Real estate | 1982 |
| Beechlane Limited | Wholesale & retail | 1981 |
| Beechwood Park (Eastcote) Management Company Limited | Households | 1988 |
| Beekdaelen Ltd | Real estate | 2023 |
| Before the After Party Ltd | Hospitality | 2025 |
| Beginnings 2025 Holdings and Investments Limited | Professional & scientific | 2025 |
| Belgrave Pharma Ltd | Wholesale & retail | 2021 |
| Belgravia LHR Room Ltd | Other services | 2019 |
| Believe Health Care Agency Limited | Health & social care | 2017 |
| Bell Lane Management Limited | Households | 1989 |
| Bella & Colin Property Ltd | Real estate | 2025 |
| Bella Development Property Ltd | Real estate | 2018 |
| Bella Vista Media Limited | Administrative & support | 2019 |
| Belle Cleaning Services UK Limited | Administrative & support | 2019 |
| Bellevue Consulting Solutions Limited | Professional & scientific | 2015 |
| Bellspire Group Ltd | Wholesale & retail | 2015 |
| Bellswood Properties Limited | Construction | 2003 |
| Belmar Ltd | Administrative & support | 2016 |
| Belmont Home Developments Limited | Real estate | 2023 |
| Belmont Transport Limited | Transport & logistics | 2017 |
| Belpower Building and Maintenance Ltd | Construction | 2023 |
| Belsize Crescent (Management) Limited | Households | 1984 |
| Belvedere 82 Limited | Households | 1999 |
| Belvoir Foods Limited | Extraterritorial | 1954 |
| BEN Ifill Services Limited | Construction | 2022 |
| Benita Food Limited | Hospitality | 2014 |
| Bennett Bros Building Contractors Limited | Construction | 2005 |
| Bennett Jewellery Group Ltd | Wholesale & retail | 2025 |
| Bennett P Services Ltd | Professional & scientific | 2018 |
| Bennett Street Ltd | Real estate | 2025 |
| Bentinck Road (Management) Company Limited | Households | 1988 |
| Bento Boys Ltd | Hospitality | 2022 |
| Benzinpetrophysics Ltd | Manufacturing | 2025 |
| Beontime Courier Ltd | Transport & logistics | 2026 |
| Berkeley House Investments Ltd | Real estate | 2019 |
| Berkshire Masonry Limited | Construction | 2007 |
| Berkshire Windows Ltd | Construction | 2020 |
| Berlad Graham LLP | | 2011 |
| Bermooda Ltd | Wholesale & retail | 2019 |
| Bermuda Forwarders (UK) Holdings Limited | Financial services | 2023 |
| Bermuda Forwarders (UK) Limited | Transport & logistics | 2013 |
| Bern Ltd | Wholesale & retail | 2019 |
| Bernard Murray Design Ltd. | Professional & scientific | 2013 |
| Berry Hill (Taplow) Ltd | Real estate | 2019 |
| Berryhurst Limited | Other services | 2007 |
| Bertinoro Books Limited | Wholesale & retail | 2014 |
| Bespoke Care Homes Limited | Health & social care | 2023 |
| Bespoke Global Trading Ltd | Wholesale & retail | 2024 |
| Bess & Data Centre Solutions Ltd | Professional & scientific | 2023 |
| Bessemer Trust Limited | Extraterritorial | 1939 |
| Best Autos Services Ltd | Wholesale & retail | 2026 |
| Best Care 4 YOU Ltd | Health & social care | 2017 |
| Best Cleaning Agency Ltd | Administrative & support | 2018 |
| Best Fresh Ltd | Wholesale & retail | 2013 |
| Best Shipping (UK) Limited | Extraterritorial | 2019 |
| Best Taste Platters Limited | Hospitality | 2005 |
| Bestrx Lifesciences Private Limited | Extraterritorial | 2025 |
| Better Sanding Flooring Ltd | Construction | 2017 |
| Betts Cuisine Ltd | Hospitality | 2024 |
| Beyond Business Intelligence Ltd | Information & communication | 2019 |
| Bezzeb Enterprises Ltd | Wholesale & retail | 2026 |
| BG Promotions Ltd | Other services | 2019 |
| BGC Lighting Ltd | Construction | 2021 |
| BGD Building Services Ltd | Construction | 2021 |
| BH GB Builds Ltd | Construction | 2023 |
| Bhagirath UK Ltd | Financial services | 2022 |