| Borkotrans Ltd | Transport & logistics | 2018 |
| Born in the Storm Ltd | Wholesale & retail | 2010 |
| Born on Road Limited | Information & communication | 2020 |
| Born to Roll Ltd | Wholesale & retail | 2024 |
| Born Wild Clothing Ltd | Wholesale & retail | 2024 |
| Borogrove Ltd | Administrative & support | 2026 |
| Borough Properties LLP | | 2004 |
| Borowiec Ltd | Wholesale & retail | 2016 |
| BOS Logistics Limited | Transport & logistics | 2026 |
| Bosaita Services Limited | Professional & scientific | 2006 |
| Bosano Consulting Limited | Financial services | 2017 |
| Boscarini Limited | Real estate | 2017 |
| Bosco & Barney Limited | Extraterritorial | 2025 |
| Boscobel Property Holdings Limited | Real estate | 2022 |
| Boscolo Limited | Construction | 2001 |
| Boslowen Properties Ltd | Real estate | 2020 |
| Boss Air Movement Limited | Manufacturing | 2005 |
| Boss Marketing Method Ltd | Professional & scientific | 2023 |
| Boss Property Management South West Ltd | Construction | 2021 |
| Boss Scaffolding (Bristol) Limited | Wholesale & retail | 2009 |
| Boss Security Ltd | Other services | 2019 |
| Boss Stationery Services Limited | Wholesale & retail | 2018 |
| Bosscut Barbers Limited | Other services | 2019 |
| Bossup Limited | Real estate | 2005 |
| Boston & Smith Co. Ltd | Real estate | 2025 |
| Boston Rose Limited | Administrative & support | 2006 |
| Bosvilla BED & Diner Ltd | Administrative & support | 2022 |
| Bosvilla Studio's Ltd | Other services | 2023 |
| BOT Ltd | Transport & logistics | 2025 |
| Botanica Studio Limited | Wholesale & retail | 2021 |
| Botany Breaks Ltd | Hospitality | 2023 |
| Botanē Limited | Wholesale & retail | 2025 |
| Botez Ltd | Construction | 2025 |
| Botigga Limited | Wholesale & retail | 2025 |
| Bottelino's Ltd | Real estate | 2001 |
| Bottled Logic Ltd | Information & communication | 2007 |
| Bottleneck Solutions Ltd | Professional & scientific | 2025 |
| Bottomless Arcade Ltd | Hospitality | 2023 |
| Bouckley's Limited | Other services | 2011 |
| Bought With Thought Limited | Wholesale & retail | 2012 |
| Boujeebass Limited | Information & communication | 2024 |
| Boumatic UK Ltd | Other services | 2016 |
| Bounce Back Transport Ltd | Transport & logistics | 2025 |
| Bounce Interactive Ltd | Administrative & support | 2004 |
| Bouncy Bee's Limited | Administrative & support | 2019 |
| Boundary Fencing (South-West) Limited | Construction | 2007 |
| Boundcopy Limited | Manufacturing | 1998 |
| Boundless Games Ltd | Manufacturing | 2023 |
| Bounty Energy Solutions and Technologies Ltd | Energy | 2019 |
| Bournebauerbond Ltd | Professional & scientific | 2024 |
| Bournemouth New Style Barbers Ltd | Other services | 2024 |
| Bournemouth Transport Limited | Transport & logistics | 1986 |
| Bourneville Land Limited | Construction | 2023 |
| Bourse Company Services Limited | Administrative & support | 1999 |
| Bourse Group (UK) Limited | Other services | 2006 |
| Bourse Ltd | Extraterritorial | 2008 |
| Bourse Nominees Limited | Professional & scientific | 1996 |
| Bourse Trustees (UK) Limited | Other services | 2010 |
| Bourton Combe Wood Limited | Professional & scientific | 2007 |
| Bourton Gardens (Badsey 21) Management Company Limited | Households | 2024 |
| Boutique & Breakfast Limited | Hospitality | 2010 |
| Boutiquemma Limited | Wholesale & retail | 2020 |
| Bouton Ltd | Construction | 2020 |
| Bouyen Limited | Transport & logistics | 2014 |
| Bovie Property Group Ltd | Real estate | 2021 |
| Bovts Communications Limited | Education | 2005 |
| Bovts Productions Limited | Arts & recreation | 1990 |
| Bowbeat Repowering Limited | Energy | 2026 |
| Bowden Road Developments Limited | Construction | 2015 |
| Bowden Way Management Company Limited | Households | 1999 |
| Bowen Investments Limited | Real estate | 2020 |
| Bowen Parker Property Limited | Real estate | 2023 |
| Bowen Surveyors Ltd | Real estate | 2024 |
| Bower Surveyors Limited | Professional & scientific | 2022 |
| Bowerhill Enterprise Centre Limited | Professional & scientific | 1998 |
| Bowerhill Window Cleaning Services Ltd | Administrative & support | 2022 |
| Bowery Bros,Limited | Wholesale & retail | 1955 |
| Bowhite Ltd | Health & social care | 2026 |
| Bowie & Davies Properties Limited | Real estate | 2024 |
| Bowl & Bread Ltd | Hospitality | 2022 |
| Bowland Stone Limited | Administrative & support | 1960 |
| Bowles Medical Ltd | Wholesale & retail | 2025 |
| Bowling Hill Limited | Wholesale & retail | 1997 |
| Bowman Bathrooms & Kitchens Ltd | Construction | 2024 |
| Bowmans Lodge Management Company Limited | Households | 2018 |
| Bowmans Reach (Stoke Orchard) Management Company Limited | Households | 2024 |
| Bowmore Energy Limited | Energy | 2011 |
| Bown (Designs) Ltd | Professional & scientific | 2005 |
| Bowood Services Limited | Administrative & support | 2001 |
| Bowood View (Melksham) Management Company Limited | Households | 2018 |
| Bowreed Limited | Arts & recreation | 2025 |
| Box 4 Consulting Limited | Professional & scientific | 2014 |
| Box Clearance Ltd | Water & waste | 2022 |
| Box Clever Trustees Limited | Financial services | 2001 |
| Box Consult Ltd | Professional & scientific | 2026 |
| Box Hedge Meadows Management Company Limited | Households | 2023 |
| Box Kitchen Pizza Limited | Hospitality | 2024 |
| Box Property Capital Limited | Financial services | 2024 |
| Box Property Management Limited | Real estate | 2022 |
| Box Rocket Ltd | Professional & scientific | 2017 |