| Belvedere House Management Limited | Households | 1987 |
| BEN Investment Properties Limited | Real estate | 2013 |
| Benconjif Ltd | Hospitality | 2012 |
| Benmicheals Ltd | Real estate | 2024 |
| Benmores (Prams & Toys) Limited | Wholesale & retail | 1967 |
| Berryl Ltd | Real estate | 2022 |
| Beshore Scaffolding Limited | Construction | 2016 |
| Best Realty Ltd | Real estate | 2025 |
| Betamed Ltd | Manufacturing | 2025 |
| Bethany Health Limited | Health & social care | 2023 |
| Bethel Foundation Ministries | Other services | 2009 |
| Bethel Inspire Limited | Information & communication | 2020 |
| Bexley Archaeological Group | Professional & scientific | 2001 |
| Bexley Grammar School | Education | 2010 |
| Bexley Moorings Project | Health & social care | 2007 |
| Bexley Quality Builders Limited | Construction | 2021 |
| Bexley Technology Limited | Information & communication | 2017 |
| Beynon-Dale Home Reserve Ltd | Financial services | 2025 |
| Beyond the PEN Limited | Professional & scientific | 2017 |
| BG Healthcare Limited | Health & social care | 2018 |
| BHB Salon Ltd | Other services | 2023 |
| Biankha and Friends Limited | Manufacturing | 2016 |
| Bibinbap Ltd | Information & communication | 2018 |
| Bielston Ltd. | Real estate | 2015 |
| Bill N BEN Property Services Limited | Construction | 2011 |
| Billy Prodec Ltd | Construction | 2013 |
| Binx's Toy Store Ltd | Wholesale & retail | 2024 |
| Birbricks Ltd | Real estate | 2020 |
| Bird Control Solutions Limited | Professional & scientific | 2023 |
| Bislot Services Limited | Education | 2025 |
| Bivled Ltd | Construction | 2017 |
| BIZ Interior Development Ltd | Wholesale & retail | 2020 |
| Bizman Ltd | Transport & logistics | 2019 |
| BKF Tiling Ltd | Construction | 2019 |
| Black Holdings Ltd | Real estate | 2020 |
| Blackaut Ltd | Wholesale & retail | 2024 |
| Blackfen Food Ltd | Hospitality | 2025 |
| Blackheath Tyres Limited | Wholesale & retail | 2013 |
| Blackridge Property Services Ltd | Real estate | 2026 |
| Blakey Games Ltd | Information & communication | 2024 |
| Blanquet Limited | Real estate | 2022 |
| Blendbox Kitchen Ltd | Hospitality | 2025 |
| Blessings Concept Limited | Professional & scientific | 2012 |
| Bliss Fitness Group Ltd | Health & social care | 2025 |
| Bloom & Bounce Limited | Administrative & support | 2025 |
| Bloom Gifts Ltd | Wholesale & retail | 2026 |
| Blue Smoke Media Ltd | Information & communication | 2025 |
| Blueaura Premium Spring Water Ltd | Manufacturing | 2025 |
| Bluepay Ltd | Professional & scientific | 2025 |
| BM5 Limited | Hospitality | 2024 |
| Bmek Property Management Ltd | Real estate | 2021 |
| Bmko Ventures Ltd | Professional & scientific | 2005 |
| Boat People Sauce Ltd | Manufacturing | 2021 |
| Bodnar Development Limited | Construction | 2023 |
| Bodnar Holding Limited | Financial services | 2023 |
| Boga Construction Ltd | Construction | 2014 |
| Boldvibe Ltd | Wholesale & retail | 2025 |
| Bollywood Music Limited | Arts & recreation | 1994 |
| Bolt Recruitment Limited | Administrative & support | 2016 |
| Boste Limited | Real estate | 2021 |
| Bottle Service Ltd | Wholesale & retail | 2022 |
| Boutique of Meat Ltd | Wholesale & retail | 2023 |
| Box of Frogs Films Limited | Information & communication | 2022 |
| BP Nutrition Ltd | Wholesale & retail | 2024 |
| Bpcb Construction Ltd | Construction | 2022 |
| BQA Consultant Limited | Wholesale & retail | 2019 |
| Brain Ring Ltd | Education | 2019 |
| Brambles Limited | Financial services | 2008 |
| Brampharmbuild Ltd | Construction | 2026 |
| Bran Solutions Ltd | Construction | 2016 |
| Brew House Station Welling Limited | Hospitality | 2025 |
| Bridge 86 Limited | Health & social care | 1987 |
| Bright Blocks Preschool Ltd | Health & social care | 2022 |
| Brighter Path Care Ltd | Health & social care | 2025 |
| Brighter Pathway Care Limited | Health & social care | 2025 |
| Brighterstore Ltd | Wholesale & retail | 2025 |
| Brilliant Motors Garage Limited | Wholesale & retail | 2025 |
| Brilliant Motors Limited | Wholesale & retail | 2021 |
| Bring Salutations Ltd | Professional & scientific | 2025 |
| Brit Beauty Care Ltd | Wholesale & retail | 2024 |
| Bronz 93 Ltd | Manufacturing | 2026 |
| Bronze Candles Investment Ltd | Manufacturing | 2025 |
| BTH Group Ltd | Financial services | 2019 |
| BTH Professional Services Ltd | Professional & scientific | 2013 |
| Buck Taxis Limited | Transport & logistics | 2024 |
| Buddha Foundation | Health & social care | 2017 |
| Buddha Limited | Hospitality | 2022 |
| Builder. Special Ltd | Construction | 2022 |
| Building and Demolition Services Ltd | Wholesale & retail | 2024 |
| Buildstyle Limited | Construction | 2025 |
| Bukkis Ltd | Health & social care | 2022 |
| Burfords (Welling) Limited | Professional & scientific | 2018 |
| Burnell Services Limited | Information & communication | 2018 |
| Bursting Corporation Limited | Wholesale & retail | 2024 |
| Burwash Property Management Limited | Construction | 2017 |
| Bushfire Forge Ltd | Manufacturing | 2016 |
| Business Analytics Solutions Limited | Information & communication | 2014 |
| Bussysuper Ltd | Health & social care | 2021 |
| Bverts Ltd | Construction | 2023 |
| BY Clarissa Ltd | Health & social care | 2024 |