| Bayram Property Limited | Real estate | 2016 |
| BB Extensions and Lofts Limited | Construction | 2018 |
| BC Consultancy Services Limited | Other services | 2004 |
| BCJ Investments Ltd | Administrative & support | 2022 |
| BE Management & Consultancy Ltd | Education | 2025 |
| Beadsewgood Ltd | Wholesale & retail | 2013 |
| Bear Place Management Limited | Households | 1996 |
| Bearwolf Training Limited | Arts & recreation | 2014 |
| Beauty Spot (Westerham) Ltd. | Other services | 2012 |
| Beckingham Block Paving Limited | Construction | 2008 |
| Beckjames Limited | Professional & scientific | 2015 |
| Beer Mergers (UK) Limited | Professional & scientific | 2010 |
| Behic Limited | Real estate | 2016 |
| BEN Williams Advisory Ltd | Arts & recreation | 2014 |
| Berkeleyclean Limited | Administrative & support | 1983 |
| Bespoke Applications Ltd | Information & communication | 2014 |
| Bespoke Storage Solutions Ltd | Transport & logistics | 2019 |
| Best Leisure Services (Kent) Limited | Hospitality | 2012 |
| Betico Ltd | Wholesale & retail | 2024 |
| Beveridge-Court Properties Limited | Real estate | 1995 |
| Beyond Education Recruitment Ltd | Administrative & support | 2022 |
| BH Falcon Investments Limited | Construction | 2017 |
| BH Thermal Ltd | Construction | 2026 |
| Bhill Curry Ltd | Hospitality | 2026 |
| Big Bins Skip Hire Ltd | Water & waste | 2022 |
| Big in Gardens Ltd | Administrative & support | 2015 |
| Biggin Cafe Ltd | Hospitality | 2019 |
| Biggin Hill Allotments Limited | Hospitality | 2020 |
| Biggin Hill Community Care Association | Health & social care | 1996 |
| Biggin Hill Hangar Company Limited | Real estate | 2008 |
| Biggin Hill Heritage Hangar Ltd | Transport & logistics | 2011 |
| Biggin Renovations Group Ltd | Construction | 2022 |
| Biggin Spice Ltd | Hospitality | 2018 |
| Bigginair Limited | Extraterritorial | 1988 |
| Bilham & Sons Limited | Construction | 1993 |
| Billbert Engineering Services Ltd | Professional & scientific | 2021 |
| Billionaire Salons Ltd | Other services | 2022 |
| Billy Monger Racing Ltd | Arts & recreation | 2018 |
| Bingham Family Office Limited | Administrative & support | 2026 |
| Biomedical Training Limited | Education | 2013 |
| Biopsychosocial Limited | Health & social care | 2006 |
| Bishop Group Services Limited | Professional & scientific | 2002 |
| Bishop Hot Tapping Limited | Professional & scientific | 2002 |
| Bishop Pipe Freezing Limited | Administrative & support | 2002 |
| Bishop Pipefreezing International Limited | Extraterritorial | 2002 |
| Bishop Shrink Fitting Limited | Administrative & support | 2023 |
| BKA Property Services Ltd | Real estate | 2025 |
| Bkbd Limited | Professional & scientific | 2017 |
| Black Eagle Estates Limited | Real estate | 2009 |
| Black Opal Developments Limited | Real estate | 2020 |
| Black Swan Tyre and Exhaust Centre Limited | Wholesale & retail | 2006 |
| Blackthorn Design Ltd | Information & communication | 2023 |
| Blagden (Holdings) Limited | Financial services | 2013 |
| Blagden Limited | Extraterritorial | 2009 |
| Blagden Specialty Chemicals Limited | Wholesale & retail | 2000 |
| Blenheim Build Solutions Ltd | Construction | 2026 |
| Blind River Ltd | Arts & recreation | 2022 |
| Blkvkg Bulding Services Ltd | Construction | 2025 |
| Bloom Accountancy Services Ltd | Other services | 2019 |
| Blose Construction Limited | Construction | 2021 |
| Blose Medical Ltd | Health & social care | 2023 |
| BLU 32 Ltd | Construction | 2016 |
| Blue Birds Bakes Ltd | Manufacturing | 2025 |
| Blue Lion Logistics Limited | Administrative & support | 2011 |
| Blue Mercury Consultancy Ltd | Information & communication | 2004 |
| Blue Monkey Films Ltd | Information & communication | 2011 |
| Blue Octopus Holdings Ltd | Administrative & support | 2020 |
| Blue Security Systems Ltd | Construction | 2007 |
| Bluebird Cleaning Services Ltd | Administrative & support | 2020 |
| Bmax Limited | Other services | 2010 |
| Bmjs Investments Limited | Professional & scientific | 2017 |
| Bodiava Ltd | Arts & recreation | 2019 |
| Bodyworx Westerham Limited | Arts & recreation | 2016 |
| Bohola Investments Ltd | Real estate | 2019 |
| Bold Media Limited | Administrative & support | 2014 |
| Bows Chair Covers Limited | Administrative & support | 2011 |
| Bowthorpe Property Ltd. | Real estate | 2006 |
| Boxers in Need (BIN) Ltd | Arts & recreation | 2024 |
| Brad's Consultancy Services Ltd | Administrative & support | 2025 |
| Bradstow Management Limited | Extraterritorial | 1994 |
| Bramar Investments Ltd | Real estate | 2021 |
| Brasted Hall Management Company Limited | Hospitality | 1989 |
| Brasted Management Limited | Households | 1996 |
| Brasted Place Limited | Households | 1996 |
| Breakshore Limited | Construction | 2004 |
| Breezyboarding Ltd | Wholesale & retail | 2023 |
| Brett Barker Plumbing Limited | Construction | 2012 |
| Brick by Brick (Kent) Ltd | Real estate | 2025 |
| Brickbox Ltd | Professional & scientific | 2018 |
| Brickfields Bar Limited | Hospitality | 2016 |
| Brickstyle Construction Ltd | Construction | 2024 |
| Bridgehaven Wealth Management Limited | Professional & scientific | 2026 |
| Bridlington Close Management C0. Limited | Households | 1998 |
| Brids Tanning & Beauty Ltd | Other services | 2026 |
| Bright Look Windows Limited | Construction | 2008 |
| Brightside Mechanical and Electrical Services Ltd | Construction | 2023 |
| Bromley Construction and Maintenance Ltd | Construction | 2016 |
| Bromley Festival of Dance Limited | Education | 2019 |
| Bromley Furniture Installations Ltd | Construction | 2012 |
| Bromley Insulation Ltd | Construction | 2023 |