| Banbridge Point Ltd | Households | 2024 |
| Bancroft Boutique Talent Ltd | Arts & recreation | 2019 |
| Bangal & Co (Croydon) Ltd | Hospitality | 2022 |
| Banjo Building Services Ltd | Construction | 2019 |
| Banstead Bunnies Limited | Health & social care | 2012 |
| Banstead Catering Ltd | Hospitality | 2026 |
| Baptist and Baptist Limited | Real estate | 2020 |
| Baptist Properties Ltd | Real estate | 2019 |
| Barber&Beauty Ltd | Other services | 2026 |
| BARBERTOP1 Ltd | Other services | 2026 |
| Barem Packaging Ltd | Administrative & support | 2024 |
| Baris Bozyigit Ltd | Health & social care | 2019 |
| Baris International Ltd | Wholesale & retail | 2020 |
| Barista Barbers Ltd | Other services | 2025 |
| Barnards Place Residents Association Limited | Households | 2017 |
| Barnmead Mews (Beckenham) Management Limited | Real estate | 1995 |
| Barq Enterprises Ltd | Wholesale & retail | 2025 |
| Barrards Hall Limited | Households | 1997 |
| Barrowsfield Management Company Limited | Households | 2020 |
| Bartek's Properties Ltd | Real estate | 2019 |
| Bartholomews Electrical Limited | Construction | 2018 |
| Bartkus and Sons Limited | Construction | 2020 |
| Bashford & Co Corporation Limited | Wholesale & retail | 2017 |
| Basil Alliance UK Limited | Wholesale & retail | 2022 |
| Bates Solutions Ltd | Wholesale & retail | 2021 |
| Battersea Kebab Limited | Hospitality | 2018 |
| Battersea Park Grill Limited | Hospitality | 2021 |
| Battersea Park Kebab Limited | Hospitality | 2022 |
| Bawa Property Investments Ltd | Construction | 2014 |
| Bawer Services Ltd | Professional & scientific | 2018 |
| Baxter and Teddy Limited | Wholesale & retail | 2024 |
| Bayside Estates Limited | Real estate | 2025 |
| BB Digital Ltd | Professional & scientific | 2018 |
| BB Property Rental and Investment Ltd | Real estate | 2023 |
| BB Soccer Football Club Ltd | Arts & recreation | 2019 |
| BB Soccer Limited | Education | 2024 |
| Bblwithkel Ltd | Other services | 2021 |
| BBR Electrical Ltd | Construction | 2019 |
| Bbsn Catering Ltd | Hospitality | 2025 |
| BC Charcoal Grill Limited | Hospitality | 2024 |
| BCI Retail Ltd | Wholesale & retail | 2024 |
| BD Bookkeeping Ltd | Professional & scientific | 2019 |
| BDC Improvements Ltd | Construction | 2023 |
| BDI Property Limited | Real estate | 2005 |
| BDM Agencies Limited | Wholesale & retail | 2012 |
| BDP Advisory Limited | Professional & scientific | 2024 |
| Beacon House Management Limited | Households | 1983 |
| Beauteecall UK Ltd | Other services | 2026 |
| Beautiful Bumps Ltd | Administrative & support | 2007 |
| Beautiful Colours Ltd | Other services | 2019 |
| Beauty Box (Sydenham) Ltd. | Other services | 2008 |
| Beckenham Manor Ltd | Financial services | 2024 |
| Beckford Electrical Ltd | Construction | 2016 |
| Beechwood Building Ltd | Construction | 2025 |
| Beechwood Garden Care Ltd | Administrative & support | 2024 |
| Beechwood Garden Design Ltd | Professional & scientific | 2024 |
| Beechwood Subscribers Limited | Professional & scientific | 1983 |
| Beejal Parmar Limited | Other services | 2014 |
| Beekman Africa Limited | Professional & scientific | 2005 |
| Begum (London) Limited | Other services | 2015 |
| Behluli Construction Ltd | Construction | 2025 |
| Belfast Corporate Interiors Limited | Manufacturing | 2012 |
| Bella Glamour London Ltd | Other services | 2025 |
| Belle Apparella Limited | Manufacturing | 2017 |
| Belloss Engineers Ltd | Professional & scientific | 2020 |
| Belloss Lettings Ltd | Real estate | 2021 |
| Bencha Limited | Transport & logistics | 2011 |
| Benchmark Digital Services Ltd | Manufacturing | 2007 |
| Benchmark Reprographics Limited | Manufacturing | 1991 |
| Benjamin and Franklin Limited | Manufacturing | 2025 |
| Benjamin Redges Limited | Construction | 2012 |
| Beotech Limited | Information & communication | 2004 |
| Berengrave Lane 2 Ltd | Construction | 2024 |
| Berkay Rayleigh Catering Limited | Hospitality | 2018 |
| Berry & Berry Properties Limited | Real estate | 2021 |
| Berry and Brie Ltd | Hospitality | 2018 |
| Berrylands Services Ltd | Administrative & support | 2023 |
| Bespoke Contract Solutions Limited | Construction | 2024 |
| Bespoke Paving Services Ltd | Construction | 2021 |
| Best Before Productions Ltd | Information & communication | 2025 |
| Best K Limited | Extraterritorial | 2016 |
| Bestway Recycling Ltd | Water & waste | 2023 |
| Better Analytics Limited | Professional & scientific | 2014 |
| Better Together Children's Services Limited | Health & social care | 2024 |
| Bettysteele Limited | Wholesale & retail | 2025 |
| Bexfield Limited | Hospitality | 2015 |
| Bexley Resurfacing & Building Ltd | Construction | 2010 |
| Beyond Borders Resources Ltd | Professional & scientific | 2020 |
| Beyond the Acorn Ltd | Health & social care | 2025 |
| Beyond the Vision Ltd | Construction | 2023 |
| Bezginsoy Investments Ltd | Real estate | 2026 |
| BFG Contractors Ltd | Construction | 2023 |
| Bfree Sports Limited | Arts & recreation | 2018 |
| BGP Tecno Limited | Information & communication | 1997 |
| Bhullar IT Consultants Limited | Information & communication | 2014 |
| Bici Cafe Limited | Hospitality | 2015 |
| Bifu Limited | Construction | 2023 |
| Big Bounce Inflatable Hire Ltd | Administrative & support | 2017 |
| Big Flame Little Flame Ltd | Construction | 2023 |
| Big Sky Energy Ltd | Wholesale & retail | 2025 |