| Bottega Vita Design Limited | Extraterritorial | 2020 |
| Bounce Rubber and Plastics Limited | Manufacturing | 2015 |
| Boundlessmart E-Commerce Ltd | Wholesale & retail | 2025 |
| Bowei Research Center | Manufacturing | 2025 |
| Bower Place (Beckenham) Management Company Limited | Households | 2019 |
| Bowman Consulting Services Ltd | Professional & scientific | 2018 |
| Boxeduk Ltd | Hospitality | 2023 |
| Boxi Textile Co., Ltd | Manufacturing | 2019 |
| Boylees Science Limited | Extraterritorial | 2012 |
| Boyuan Trading Co., Ltd | Wholesale & retail | 2020 |
| Bozi Biology Co., Ltd | Wholesale & retail | 2023 |
| BP Natural Company Ltd | Manufacturing | 2020 |
| BR3 C3 Limited | Administrative & support | 2013 |
| Bradbourne Vale Developments Limited | Construction | 2024 |
| Bradgate House Limited | Health & social care | 2009 |
| Bradley Harris Limited | Professional & scientific | 2003 |
| Braidwood Holdings Limited | Professional & scientific | 2009 |
| Brainbloom After School Club Limited | Health & social care | 2026 |
| Brainwave VR Ltd | Information & communication | 2017 |
| Bram & Friends Hospitality Limited | Wholesale & retail | 2022 |
| Bramar Freehold Limited | Real estate | 2003 |
| Brambling House Limited | Information & communication | 2026 |
| Bramhope Partners Ltd | Real estate | 2023 |
| Branded One Limited | Real estate | 2011 |
| Branorino Limited | Wholesale & retail | 2023 |
| Branton Industry Co., Ltd | Extraterritorial | 2012 |
| Brasell Global Trading Co., Ltd | Wholesale & retail | 2024 |
| Brassfit Plumbing Company Limited | Wholesale & retail | 2021 |
| Braveworks Ltd | Information & communication | 2026 |
| Braye Media Limited | Information & communication | 2021 |
| Brazil Ipiranga Petroleum Gulfstream Co., Ltd | Extraterritorial | 2021 |
| Breen Analytical Instruments Limited | Manufacturing | 2025 |
| Breeze Apartments Ltd | Real estate | 2019 |
| Breeze Yoga Limited | Arts & recreation | 2008 |
| Breezy Path Ltd | Wholesale & retail | 2023 |
| Brew & Toast Italiano Limited | Hospitality | 2026 |
| Brew Union UK Ltd | Manufacturing | 2021 |
| Brick & Morty Ltd | Real estate | 2021 |
| Bricklayers Management Limited | Hospitality | 2013 |
| Briden Underpinning & Piling Limited | Construction | 1998 |
| Bridge International Dialogue Limited | Education | 2007 |
| Bridgelands Estate Management Limited | Households | 2004 |
| Bright Future Consulting Ltd | Construction | 2024 |
| Bright Industries Limited | Extraterritorial | 2012 |
| Bright Sourcing Products Limited | Extraterritorial | 2026 |
| Bright Star Industries Limited | Financial services | 2024 |
| Brighter Future 2025 Ltd | Construction | 2025 |
| Brightness Media Productions Limited | Professional & scientific | 2013 |
| Brightness Media UK Limited | Professional & scientific | 2007 |
| Brightside Psychiatry Group Ltd | Health & social care | 2025 |
| Brightspce Limited | Construction | 2025 |
| Brightum Company Limited | Extraterritorial | 2014 |
| Brillante Technology Co., Ltd | Extraterritorial | 2017 |
| Brilliant Co., Ltd | Manufacturing | 2020 |
| Brilliant World Health Management Limited | Manufacturing | 2025 |
| Brimar Contractors Limited | Construction | 2019 |
| Bring Your Own Baby Comedy Limited | Arts & recreation | 2024 |
| Brisin Chemical Co., Ltd | Wholesale & retail | 2024 |
| Brisk Steel Co., Ltd | Manufacturing | 2023 |
| Bristar Corporation Limited | Manufacturing | 2022 |
| Britecho Media Limited | Wholesale & retail | 2024 |
| Britherm Control Limited | Manufacturing | 2019 |
| Bro-Ad Network Limited | Wholesale & retail | 2021 |
| Broadtrec Prospective Co., Ltd. | Extraterritorial | 2014 |
| Broadway Court Management Limited | Households | 1980 |
| Broadwin Group Ltd | Extraterritorial | 2016 |
| Brock Pre-Schools Limited | Education | 2018 |
| Brockbrown Films Limited | Information & communication | 2018 |
| Brocklehurst Estates Limited | Real estate | 2011 |
| Bromley Electric Systems Limited | Administrative & support | 2017 |
| Bromley GP Alliance Limited | Professional & scientific | 2015 |
| Bromley Muslim Association | Other services | 2009 |
| Bromley Road Freeholders Ltd | Hospitality | 2014 |
| Bromley Roofer Ltd | Construction | 2023 |
| Bronsonn Co., Ltd | Wholesale & retail | 2022 |
| Brother Industrial Holdings Ltd | Extraterritorial | 2014 |
| Bruk Security Ltd | Administrative & support | 2025 |
| Bryant Vehicles Trading Limited | Wholesale & retail | 2019 |
| BT Assets Limited | Real estate | 2021 |
| BTLPD1 Limited | Real estate | 2023 |
| BTLPD2 Limited | Real estate | 2024 |
| Bucci Batani UK Ltd | Professional & scientific | 2009 |
| Buckingham Bridgefinance Corp Ltd | Financial services | 2012 |
| Buckley Heritage Planning Limited | Professional & scientific | 2022 |
| Budget Appliances of Beckenham Limited | Wholesale & retail | 2017 |
| Budis Motor Co., Limited | Manufacturing | 2022 |
| Bueno Enterprise Limited | Extraterritorial | 2013 |
| Bueno Industrial Co., Ltd | Professional & scientific | 2015 |
| Bufsou Group UK Limited | Manufacturing | 2024 |
| Buiesc Limited | Professional & scientific | 2016 |
| Building Environmental & Technical Services Ltd | Construction | 1998 |
| Buiskiy Himicheskiy Zavod Share Co., Ltd | Extraterritorial | 2025 |
| Bulknature International Holding Group Co., Ltd | Agriculture & fishing | 2022 |
| Bullpen Productions Limited | Information & communication | 2011 |
| Bunny Cake Internet Technology Ltd | Wholesale & retail | 2021 |
| Buongiorno Pizza Ltd | Hospitality | 2020 |
| Burcome Group Limited | Wholesale & retail | 2020 |
| Burgtech Holdings Ltd. | Extraterritorial | 2021 |
| Burley Investments Limited | Extraterritorial | 1993 |
| Burlington Supply Limited | Wholesale & retail | 2021 |