| Brown & Co Developments Ltd | Construction | 2024 |
| Brown Earth Technologies UK Limited | Information & communication | 2015 |
| BRS Landlord Services Ltd | Construction | 2022 |
| Bruce's Cars Ltd | Transport & logistics | 2018 |
| Bruin Investments Ltd | Real estate | 2017 |
| Bruka Ltd | Construction | 2017 |
| Brunchies Dining Ltd | Hospitality | 2024 |
| Brunswick Cars Surrey Ltd | Transport & logistics | 2022 |
| Brunswick Manor (Garden and Maintenance) Company Limited | Households | 1962 |
| Bruscompany Limited | Manufacturing | 2026 |
| Brushology Ltd | Construction | 2025 |
| BRV Developments Limited | Construction | 2022 |
| Bryanston Property Company Limited | Real estate | 1935 |
| Bryant House Management Limited | Households | 1983 |
| BS Industries Limited | Real estate | 2026 |
| BSF Consumables Ltd | Construction | 2014 |
| BSL Paving Ltd | Administrative & support | 2023 |
| Bthjq Estate Holdings Limited | Real estate | 2026 |
| Bthn Ltd | Hospitality | 2018 |
| BTK Mortgage Services Ltd | Financial services | 2024 |
| Btmedical Ltd | Real estate | 2017 |
| Bubblebus Systems Limited | Administrative & support | 2009 |
| Buchanan Court (Sutton) Management Company Limited | Real estate | 2006 |
| Buchanan Court Management Limited | Households | 1973 |
| Buckland Pools & Buildings Company Ltd | Construction | 2025 |
| Bugsy's (UK) Limited | Hospitality | 1998 |
| Builder Momentum Ltd | Professional & scientific | 2025 |
| Building and Handyman Fulham Limited | Other services | 2011 |
| Building LOW Carbon Solutions Limited | Professional & scientific | 2020 |
| Building Safety ACT Consultants Limited | Information & communication | 2023 |
| Buildlink Ltd | Construction | 2022 |
| Built on Balance Ltd | Arts & recreation | 2026 |
| Bulair Building Services Ltd | Other services | 2020 |
| Bulbuild Group Ltd | Construction | 2017 |
| Bulmos Drylining Ltd | Construction | 2022 |
| Bulmos Ltd | Construction | 2004 |
| Bumpsa-Daisies Nursery Ltd | Education | 2019 |
| Bunce Electrical Limited | Construction | 2025 |
| Burdon Park (Cheam) Curtilage Company Limited | Real estate | 1973 |
| Burford Services Ltd | Administrative & support | 2020 |
| Burinox Ltd | Construction | 2024 |
| Burket Close Limited | Real estate | 2019 |
| Burleigh House Management Limited | Households | 1996 |
| Burlington House Mgmt Ltd | Households | 1988 |
| Burn & Warne Lettings and Management Ltd | Real estate | 2009 |
| Burn and Warne Limited | Real estate | 1996 |
| Burning Down the House Limited | Hospitality | 2026 |
| Burning West Limted Ltd | Construction | 2024 |
| Burning Works (UK) Ltd. | Information & communication | 2024 |
| Burns Court Wallington (Managements) Limited | Households | 1966 |
| Burns Scaffolding Limited | Construction | 2009 |
| Burntwood Audio Ltd | Information & communication | 2022 |
| Burstow Lodge Business Centre Limited | Real estate | 2018 |
| BURY2GETHER CIC | Health & social care | 2022 |
| Busin N Clubin Ltd | Other services | 2013 |
| Business Line Insurance Services Limited | Financial services | 2002 |
| Business Matters (UK) Limited | Professional & scientific | 1992 |
| Business Safety ACT Services Limited | Public administration | 2024 |
| Butchers Area Ltd | Wholesale & retail | 2019 |
| Buttercups Florist (Surrey) Limited | Arts & recreation | 2013 |
| Buyomed Ltd | Wholesale & retail | 2025 |
| BWB Carpentry & Construction Ltd | Construction | 2015 |
| BWS Direct Ltd | Wholesale & retail | 2016 |
| BY Anna London Limited | Manufacturing | 2021 |
| BY Taylor Ltd | Wholesale & retail | 2023 |
| Byrob Special Projects Limited | Construction | 2022 |
| Byron Garage Limited | Wholesale & retail | 2014 |
| Byrongate Limited | Households | 1999 |
| Bytesurge Limited | Professional & scientific | 2015 |
| Bywater Rail Limited | Construction | 2010 |
| BZU Holdings Limited | Real estate | 2023 |
| C & C Trading (NKT) Limited | Wholesale & retail | 2019 |
| C & F Associates Limited | Extraterritorial | 2023 |
| C & M Pathways Ltd | Administrative & support | 2025 |
| C a Plastering & Rendering Ltd | Construction | 2020 |
| C Cappilli Limited | Manufacturing | 2023 |
| C J Sampson Ltd | Real estate | 2019 |
| C Strydom Ltd | Transport & logistics | 2026 |
| C V Harrow Consulting Ltd | Other services | 2018 |
| C Wong Limited | Professional & scientific | 2025 |
| C&P Business Limited | Real estate | 2017 |
| C. Miell Building & Maintenance Ltd | Construction | 2011 |
| C.A.B. (UK) Recruitment Limited | Other services | 2019 |
| C.A.M Scenic Ltd | Information & communication | 2015 |
| C.G.I's Limited | Construction | 1998 |
| C.G.Wells & Co.Limited | | 1978 |
| C.J. Construction (Surrey) Limited | Construction | 2001 |
| C.K. Heffernan Limited | Real estate | 1975 |
| C.T.F.Limited | Real estate | 1951 |
| C4 Environmental Consultancy Ltd | Professional & scientific | 2021 |
| C4S Consultants Limited | Professional & scientific | 2018 |
| C9 Group Ltd | Information & communication | 2021 |
| Caat Advisory Ltd | Professional & scientific | 2018 |
| CAB Lifting Services Limited | Construction | 2015 |
| CAC Consultant Ltd | Administrative & support | 2024 |
| CAD Care Private Limited | Information & communication | 2020 |
| Cadb Projects LLP | | 2016 |
| Cadsco Ltd | Professional & scientific | 2014 |
| Caesar & Co. Accountants Limited | Professional & scientific | 2011 |
| Cafe Chaiwala Sutton Limited | Hospitality | 2026 |