| Bay Hill Recruitment Ltd | Administrative & support | 2020 |
| BB Plastering and Building Ltd | Construction | 2023 |
| BC Landscapes Ltd | Administrative & support | 2021 |
| BCC Ductwork Limited | Construction | 2017 |
| Bcch International Ltd | Education | 2026 |
| BD42 Ltd | Real estate | 2026 |
| BE Onpoint Consulting Ltd | Professional & scientific | 2023 |
| Beaufort Nannies Ltd | Administrative & support | 2025 |
| Beauty Enhancer Limited | Health & social care | 2023 |
| Beavers Mechanical Engineers Ltd | Construction | 2018 |
| Beech Hurst Park (Chislehurst) Management Company Limited | Households | 2011 |
| Beech Property Business Limited | Real estate | 2017 |
| Beechwood Technical Services Limited | Professional & scientific | 2023 |
| Bel-Aire Property Services & Developers Ltd | Construction | 2017 |
| Belfairs Properties Ltd | Real estate | 2022 |
| Bellabo Investments Ltd | Real estate | 2018 |
| Bells Accountants Ltd | Professional & scientific | 2016 |
| Bells Bookkeeping Ltd | Professional & scientific | 2016 |
| Bells Holdings Limited | Financial services | 2019 |
| Bells Properties Limited | Real estate | 2018 |
| Bells Social Enterprises Ltd | Health & social care | 2019 |
| Belmont Lane Allotments Limited | Agriculture & fishing | 2021 |
| Benaron Development Holdings Limited | Financial services | 2026 |
| Benaron Development Limited | Information & communication | 2026 |
| Benaron Property Limited | Real estate | 2021 |
| Berrington Partners Ltd | Real estate | 2021 |
| Berry Entertainment Limited | Information & communication | 2010 |
| Best PDR Ltd | Wholesale & retail | 2025 |
| Bestfedraw Ltd | Wholesale & retail | 2024 |
| Bexley Building & Landscaping Ltd | Construction | 2024 |
| Bicycle Moaning Collective Limited | Arts & recreation | 2016 |
| Biddle Matthews Limited | Professional & scientific | 2014 |
| Big Town Ltd | Construction | 2015 |
| Bigfoot Cycle Club Limited | Arts & recreation | 2018 |
| Binnie Trading Ltd | Wholesale & retail | 2025 |
| BIO Hack Limited | Professional & scientific | 2017 |
| Biomimicry Gaia Ltd | Manufacturing | 2023 |
| Bionic Limited | Extraterritorial | 1997 |
| Birch Residential Homes Limited | Construction | 2015 |
| Birchall Gregory Ltd | Financial services | 2021 |
| Birchrock Ltd | Administrative & support | 2025 |
| Birchwood Aesthetics Limited | Other services | 2024 |
| Bished Limited | Professional & scientific | 2011 |
| Bishops Walk Residents' Association Limited | Households | 1967 |
| Bitware Technologies Ltd | Other services | 2023 |
| Blackfox Creative Ltd | Professional & scientific | 2018 |
| Blackheath Advisors Ltd | Professional & scientific | 2024 |
| Blackheath Flooring Studios Ltd | Construction | 2004 |
| Blackheath Shutters Ltd | Wholesale & retail | 2018 |
| Blakemore Hotels Property Holdings Limited | Real estate | 2017 |
| BLD Estates Limited | Real estate | 2019 |
| Blue Box Networks Ltd | Information & communication | 2017 |
| Blue Kite Consultancy Ltd | Professional & scientific | 2012 |
| Blue Red Services Ltd | Professional & scientific | 2018 |
| Blue Water Plumbing & Heating Ltd | Construction | 2022 |
| Bluerose Tattoos Ltd | Other services | 2017 |
| Bluetaxi Limited | Transport & logistics | 2003 |
| Boardwalk Scaffolding Ltd | Construction | 2016 |
| Bob's Loyalty Shop Ltd | Professional & scientific | 2020 |
| Bonchester Freehold Company Limited | Households | 2005 |
| BR7 5NQ Road Limited | Administrative & support | 2006 |
| Brackley Road (Beckenham) Management Company Limited | Households | 1971 |
| Brackley Road (Beckenham) RTM Company Limited | Households | 2020 |
| Bradley Smith Hair Ltd | Other services | 2015 |
| Bramwell House Limited | Real estate | 2014 |
| Brand LAB Consulting Ltd | Professional & scientific | 2025 |
| Brandonnet Limited | Other services | 2019 |
| Brandsmiths Holdings Limited | Information & communication | 2014 |
| Breakfast Creative Limited | Professional & scientific | 2021 |
| Brett Logistics Limited | Transport & logistics | 2011 |
| Brewster Productions Ltd | Information & communication | 2023 |
| Bricklane Bagel Chislehurst Ltd | Hospitality | 2025 |
| Bricks ETC Limited | Hospitality | 2026 |
| Brickspace Investments Ltd | Real estate | 2022 |
| Bridges Fish & Chips Limited | Hospitality | 2017 |
| Brightcove Estates Ltd | Real estate | 2018 |
| Brilliant Salons Ltd | Other services | 2026 |
| Broad Infotech Limited | Information & communication | 2015 |
| Broadsheet Services Limited | Financial services | 1992 |
| Broadwood Investments Limited | Real estate | 2019 |
| Brockley Flooring Limited | Construction | 2011 |
| Bronco Ventures Limited | Professional & scientific | 2024 |
| Brun ET Noir Ltd. | Manufacturing | 2012 |
| Brutmark Ltd | Wholesale & retail | 2018 |
| BSL Home Improvements Ltd | Construction | 2018 |
| BTC1 Limited | Other services | 2025 |
| Btfs Limited | Professional & scientific | 2002 |
| Btwco Ltd | Wholesale & retail | 2022 |
| Buba Consultancy & Management Ltd | Wholesale & retail | 2017 |
| Buddha Living Ltd | Real estate | 2024 |
| Buggy-Inv Ltd | Financial services | 2021 |
| Build Choice Ltd | Construction | 2025 |
| Buildaway Construction Ltd | Construction | 2025 |
| BUL Decs Ltd | Construction | 2023 |
| BURFORD12 Ltd | Arts & recreation | 2016 |
| Burrell & Mistry Ltd | Professional & scientific | 2014 |
| Business Beginners Ltd | Information & communication | 2015 |
| Butterfly Home Care Ltd | Health & social care | 2019 |
| C M D Rail Limited | Administrative & support | 2012 |
| C&C Eyre Limited | Financial services | 2020 |