| Bordersx Ltd | Information & communication | 2026 |
| Bordric Limited | Real estate | 2023 |
| Borebank Enterprises Ltd | Hospitality | 2022 |
| Boresight UK Ltd | Wholesale & retail | 2025 |
| Boris Removals Limited | Transport & logistics | 2020 |
| Borkowski Consultancy Limited | Professional & scientific | 2015 |
| Born Limitless Holdings Limited | Financial services | 2022 |
| Born Limitless III Ltd | Administrative & support | 2021 |
| Born Limitless Ltd | Professional & scientific | 2019 |
| Born to Amplify Ltd | Professional & scientific | 2014 |
| Born Ventures Ltd | Professional & scientific | 2025 |
| Boros Properties Ltd | Real estate | 2021 |
| Borrowash Dental Care Limited | Health & social care | 2024 |
| Borthwick Butcher Boyle Ltd | Wholesale & retail | 2025 |
| Bosaco Ltd | Other services | 2020 |
| Boscoel Limited | Transport & logistics | 2016 |
| Bose Partners Consulting Ltd | Professional & scientific | 2017 |
| Boshpro Limited | Arts & recreation | 2025 |
| Boss Global Media Limited | Professional & scientific | 2018 |
| Boss Global Properties Limited | Real estate | 2018 |
| Boss Monkey Limited | Real estate | 2013 |
| Boss Photography Limited | Professional & scientific | 2025 |
| Bosshome Properties Limited | Real estate | 2003 |
| Bossland Ltd | Other services | 2020 |
| Bostan Health Care Limited | Health & social care | 2010 |
| Bostan Plumbing & Heating Ltd | Construction | 2023 |
| Bostan Properties (Nottm) Ltd | Real estate | 2017 |
| Bostan Property Management Ltd | Real estate | 2018 |
| Bostock Lighting Ltd | Manufacturing | 2015 |
| Boston Capital & Investments LP | | 2021 |
| Boston Motors,Limited | Wholesale & retail | 1942 |
| Boston Town VE Limited | Other services | 2011 |
| Bosworth Housing Ltd. | Real estate | 2020 |
| Botanical Interior Design Ltd | Manufacturing | 2024 |
| Botham Accounting Limited | Professional & scientific | 2008 |
| Botham Accounting South Yorkshire Ltd | Professional & scientific | 2025 |
| Botham Capital Limited | Financial services | 2023 |
| Botham Holdings Limited | Financial services | 2025 |
| Bottesford Community Sports Club Ltd | Arts & recreation | 2014 |
| Bottesford Football Club Limited | Arts & recreation | 2020 |
| Bottesford Homes Ltd | Construction | 2024 |
| Bottesford NG13 Ltd | Hospitality | 2023 |
| Bottle Kiln Property Limited | Real estate | 2009 |
| Bottletop Design Limited | Information & communication | 2004 |
| Bottom Line Lifestyle and Fitness Limited | Arts & recreation | 2013 |
| Botts Building Ltd | Real estate | 2025 |
| Boucheron Wines UK Ltd | Wholesale & retail | 2021 |
| Boujee Bell Tent Co Ltd | Hospitality | 2021 |
| Boujiebouquets Ltd | Wholesale & retail | 2024 |
| Boulas Properties Ltd | Real estate | 2022 |
| Boulevard Consultants Ltd | Professional & scientific | 2025 |
| Boulevard Management Services Limited | Professional & scientific | 2010 |
| Boulevard Park Estates Ltd | Real estate | 2024 |
| Bounce Architecture Design & Build Ltd | Construction | 2025 |
| Bounce Architecture Ltd | Professional & scientific | 2025 |
| Bounce Buddies Limited | Arts & recreation | 2024 |
| Boundary Residential Ltd | Real estate | 2021 |
| Boundless Minds Ltd | Health & social care | 2026 |
| Bounty Enterprises Limited | Hospitality | 2023 |
| Bourbon Pubs Ltd | Hospitality | 2025 |
| Bourne ENT Ltd | Information & communication | 2021 |
| Bournemouth Arcade Jewellers Limited | Wholesale & retail | 2024 |
| Bournemouth V.E. Limited | Other services | 2019 |
| Boutique Desserts Ltd | Hospitality | 2025 |
| Boutique Flowers Ltd | Wholesale & retail | 2019 |
| Bovbarbers Ltd | Other services | 2026 |
| BOW and Mochi Ltd | Manufacturing | 2020 |
| Bowcap Ltd | Construction | 2024 |
| Bowcliffe Developments Ltd | Construction | 2025 |
| Bowden Property Management Ltd | Real estate | 2020 |
| Bowe Properties Ltd | Households | 2020 |
| Bowen Estates Ltd | Real estate | 2024 |
| Bower & Broughton Plumbing and Heating Limited | Construction | 2005 |
| Bower and Wood Limited | Wholesale & retail | 2016 |
| Bower Parnham Stewart Limited | Professional & scientific | 1997 |
| Bower Recycling Limited | Water & waste | 2021 |
| Bowerbird Productions Ltd | Information & communication | 2022 |
| Bowerman Homes Limited | Construction | 2016 |
| Bowers Nationwide Road Repairs Limited | Construction | 2021 |
| Bowers Transformers Limited | Professional & scientific | 1985 |
| Bowery Properties Limited | Real estate | 2019 |
| Bowker Leisure Limited | Wholesale & retail | 2016 |
| Bowlduk Limited | Hospitality | 2024 |
| Bowler Brand Limited | Construction | 2025 |
| Bowmanor Ltd | Real estate | 2019 |
| Bowmans Ltd | Construction | 2006 |
| Box 5 Properties Limited | Real estate | 2026 |
| Box Border Limited | Information & communication | 2010 |
| Box Bros.Limited | Other services | 1923 |
| Box LAB Experience Ltd | Wholesale & retail | 2020 |
| Box of Smiles Ltd | Wholesale & retail | 2021 |
| Box Property Consultants Limited | Construction | 2017 |
| Box TEN Limited | Professional & scientific | 1996 |
| BOX09 Electrical Limited | Construction | 2021 |
| BOX09 Limited | Information & communication | 2013 |
| BOX3 Developments Ltd | Real estate | 2022 |
| Boxcasions Ltd | Professional & scientific | 2019 |
| Boxed Collectables Ltd | Wholesale & retail | 2024 |
| Boxed Drinks Limited | Hospitality | 2017 |
| Boxedclassics Limited | Transport & logistics | 2021 |