| Brith Services Limited | Construction | 1993 |
| British Light Aviation Centre Limited(The) | Professional & scientific | 1966 |
| Brittanniacourt Properties (UK) Limited | Real estate | 1992 |
| Broad Oak Holdings Limited | Households | 2016 |
| Broad Reach Properties Limited | Real estate | 2002 |
| Broadcast Ninja Ltd | Information & communication | 2020 |
| Broadoaks Advisory Ltd | Professional & scientific | 2025 |
| Brodmoore Ltd | Manufacturing | 2019 |
| Broker Continuity Planning Limited | Real estate | 2004 |
| Bromley Car Audio Limited | Wholesale & retail | 2015 |
| Bromley Motor Works Limited | Extraterritorial | 1967 |
| Bromley Systems Limited | Information & communication | 2005 |
| Bronagh Meere Styling Limited | Other services | 2012 |
| Bronze Beauty Studio Ltd | Other services | 2018 |
| Brookdale Club(Catford)Limited(The) | Other services | 1919 |
| Brookfield Villas Ltd | Real estate | 2020 |
| Brookhurst Advisory Limited | Professional & scientific | 2019 |
| Brookhurst Risk Solutions Limited | Financial services | 2020 |
| Brookmoor Trading Ltd | Wholesale & retail | 2023 |
| Brooks Collection Services Ltd | Administrative & support | 2016 |
| Brooks Enterprise Limited | Health & social care | 2022 |
| Brooks Property Partners Ltd | Real estate | 2025 |
| Brookstreet Property Developments Limited | Construction | 2007 |
| Brookwood Fidelity Ltd | Financial services | 2014 |
| Brosna View Pet Care Limited | Professional & scientific | 2016 |
| Brown Envelope Productions Ltd | Arts & recreation | 2026 |
| Browns Clinic Limited | Health & social care | 2014 |
| Brunch @ Biler’S Ltd | Manufacturing | 2019 |
| Brutus Management Limited | Professional & scientific | 2006 |
| BSG Windows Limited | Construction | 2014 |
| BTD Advisory Ltd | Information & communication | 2025 |
| BTL Properties Limited | Transport & logistics | 1988 |
| Buacom Ltd | Financial services | 2002 |
| Bubbleride Limited | Transport & logistics | 2024 |
| Buckwell Place Sevenoaks Limited | Households | 2005 |
| Budee AI Ltd | Information & communication | 2021 |
| Bugbag Ltd | Wholesale & retail | 2021 |
| Build Measure Limited | Professional & scientific | 2025 |
| Buildcrest Limited | Construction | 2011 |
| Buildify Ltd | Information & communication | 2024 |
| Building Better Relationships Ltd | Other services | 2011 |
| Building Safety Manager Resource Limited | Professional & scientific | 2021 |
| Bulkfertz LLP | | 2017 |
| Bumble Bees Day Nursery and Preschool Ltd | Health & social care | 2026 |
| Bunker House Developments Ltd | Construction | 2023 |
| Buntastic Sevenoaks Limited | Hospitality | 2023 |
| Bureau Coxon | | 1988 |
| Burgess Investment Properties Limited | Real estate | 2020 |
| Burleigh Electrical Services Ltd | Construction | 2026 |
| Burlington Chase Limited | Administrative & support | 2008 |
| Burlington Mews Management Company Limited | Households | 2019 |
| Burlington Place (Sevenoaks) Limited | Households | 2007 |
| Burlington Place Limited | Households | 2006 |
| Burrwood Developments Limited | Construction | 2024 |
| Burtenshaw Holt Collective Limited | Professional & scientific | 2026 |
| Business Growth Space Ltd | Other services | 2022 |
| Business Growth With Dani Limited | Administrative & support | 2025 |
| Business Social Hub Ltd | Professional & scientific | 2025 |
| Butch Associates Limited | Hospitality | 2017 |
| Buxted Park Hotel Limited | Hospitality | 1999 |
| Buy ANY Part Limited | Wholesale & retail | 2013 |
| Buy Wise Supplies Ltd | Manufacturing | 2024 |
| Buzz Darts Limited | Wholesale & retail | 2023 |
| BV Consulting (London) Limited | Other services | 2024 |
| Bvrefoot Limited | Extraterritorial | 2025 |
| BWF Investments Ltd | Other services | 2014 |
| Bwgti Price Ventures LLP | | 2023 |
| BWM Shipping Company Limited | Transport & logistics | 2017 |
| BY Mark Ltd | Professional & scientific | 2021 |
| Bytesize Data Systems Limited | Professional & scientific | 1998 |
| Bytesphere Software Ltd | Information & communication | 2024 |
| C & J Events Ltd | Administrative & support | 2021 |
| C a Financial Services Ltd | Financial services | 2016 |
| C Block Lakeside Apartments RTM Company Limited | Households | 2025 |
| C D Carpentry Services Limited | Construction | 2020 |
| C G Transport Solutions Limited | Transport & logistics | 2014 |
| C J Hugo Limited | Financial services | 2009 |
| C R Flooring Limited | Construction | 2002 |
| C T Agricultural Services Ltd | Manufacturing | 2009 |
| C&O Bell Limited | Construction | 2022 |
| C&P Capital Limited | Wholesale & retail | 2026 |
| C-Yourculture UK Ltd | Professional & scientific | 2024 |
| C.G Landymore Limited | Professional & scientific | 2025 |
| C365 Limited | Financial services | 2012 |
| Cable Location Services Limited | Construction | 2003 |
| Cablesheer Homes Ltd | Construction | 2012 |
| Cablesheer Projects Ltd | Extraterritorial | 2014 |
| Caches Limited | Administrative & support | 2008 |
| Caderlurst UK Limited | Real estate | 2023 |
| Cadplan Services Limited | Professional & scientific | 2001 |
| Cadsin Limited | Manufacturing | 2025 |
| Cafe DU Monde Limited | Hospitality | 1989 |
| Cafe Frank LDN Ltd | Hospitality | 2024 |
| Caistor Thames Limited | Professional & scientific | 2014 |
| Cakes by Lynz Ltd | Extraterritorial | 2025 |
| CAL Ecom Limited | Wholesale & retail | 2024 |
| Calbull Investments Ltd | Real estate | 2017 |
| Calderas BPR Ltd | Real estate | 2024 |
| Caleb Transformation Services Limited | Administrative & support | 2015 |
| Calh Consulting Limited | Professional & scientific | 2015 |