| Balstaberg Properties Ltd | Real estate | 2026 |
| Balthorpe Homes Ltd | Real estate | 2023 |
| Baltic C Limited | Real estate | 2024 |
| Banctec Europe Limited | Information & communication | 2017 |
| Barnes and Putney Roofing Ltd | Construction | 2025 |
| Barrcore Construction Limited | Administrative & support | 2023 |
| Bartels Ltd | Hospitality | 2022 |
| Bartres Construction Limited | Construction | 2019 |
| Based on Real Estate Rentals Ltd | Real estate | 2021 |
| BAT Plumbing and Heating Ltd | Construction | 2025 |
| Batavia Domus Ltd | Real estate | 2022 |
| Batho Dancing Limited | Arts & recreation | 2025 |
| Battersea Care Home Holdings Limited | Financial services | 2019 |
| Battersea Care Home Limited | Health & social care | 2016 |
| Battersea Care Limited | Health & social care | 2016 |
| Baytereen Asdae AI Ltd | Information & communication | 2025 |
| Bazils Kitchen Ltd | Hospitality | 2017 |
| BB BH Limited | Real estate | 2025 |
| BBD Solutions Ltd | Other services | 2023 |
| BD Dean Consulting Limited | Professional & scientific | 2022 |
| Bdav Holding Ltd | Professional & scientific | 2022 |
| Bdib Global LLP | | 2021 |
| Beach AVE Development Ltd | Construction | 2022 |
| Beauco Systems Ltd | Other services | 2018 |
| Beaufort RTM Company Ltd | Real estate | 2013 |
| Beautiful Family Ltd | Wholesale & retail | 2020 |
| Beautiful Homes Investments Limited | Real estate | 2022 |
| Beautymoments Health & Beauty Ltd | Professional & scientific | 2025 |
| Beaver Construction Services Ltd | Construction | 2016 |
| Becker Legacy Ltd | Other services | 2025 |
| Beddington Gardens RTM Company Limited | Real estate | 2005 |
| Beebbeeb Limited | Information & communication | 2026 |
| Begovia Child Protection Ltd | Other services | 2026 |
| Beirut Crust Ltd | Hospitality | 2025 |
| Belair Maison Ltd | Wholesale & retail | 2025 |
| Beli Izvor LLP | | 2025 |
| Believers Limited | Professional & scientific | 2011 |
| Bella Interior Ltd | Professional & scientific | 2004 |
| Belle VUE Blinds Ltd | Wholesale & retail | 2010 |
| Bellevue Global Ltd | Other services | 2024 |
| Bellmoore Recovery Ltd | Extraterritorial | 2024 |
| Belron 2018 Limited | Professional & scientific | 2018 |
| Belron Finance Issuer Limited | Professional & scientific | 2017 |
| Belron Finance Limited | Professional & scientific | 1999 |
| Belron Germany Holdings Limited | Professional & scientific | 2024 |
| Belron Hedgeco One Limited | Professional & scientific | 2018 |
| Belron Hedgeco Three Limited | Professional & scientific | 2022 |
| Belron Hedgeco Two Limited | Professional & scientific | 2018 |
| Belron International Limited | Professional & scientific | 1989 |
| Belron Lending UK Limited | Professional & scientific | 2017 |
| Belron Limited | Professional & scientific | 2013 |
| Belron Limited Partnership | | 2022 |
| Belron Reserveco Limited | Professional & scientific | 2022 |
| Belron Technical Limited | Professional & scientific | 1983 |
| Belron UK Finance PLC | Financial services | 2024 |
| Belron UK Holdings Limited | Financial services | 2024 |
| Belshaw & Curtin Limited | Professional & scientific | 2016 |
| Benedikt Keck Ltd | Other services | 2023 |
| Benefit Real Estate Ltd | Real estate | 2025 |
| Bentom Properties Ltd | Real estate | 2021 |
| Berger & Partner Ltd | Financial services | 2021 |
| Berkeley Care Homes Limited | Health & social care | 1994 |
| Berkshire Private GP Limited | Health & social care | 2024 |
| Berkshire Private Wealth Limited | Financial services | 2015 |
| Berkshire Staffing Ltd | Administrative & support | 2019 |
| Berkshire Tax Practice Limited | Professional & scientific | 2017 |
| Berkshire Wealth LLP | | 2013 |
| Berkshire Wealth UK Limited | Extraterritorial | 2015 |
| Berrow Shay Pubs Ltd | Hospitality | 2026 |
| Bespoke Build Solutions Limited | Construction | 2014 |
| Best END Restaurants Limited | Financial services | 2024 |
| Betti Homes Ltd | Hospitality | 2025 |
| BEX Supply Ltd | Wholesale & retail | 2024 |
| Bexhill Care Home Holdings Limited | Financial services | 2019 |
| Bexhill Care Home Limited | Health & social care | 2017 |
| Bexhill Care Limited | Health & social care | 2019 |
| Beyond Property Ventures Limited | Real estate | 2021 |
| Beyond the Blue Limited | Professional & scientific | 2005 |
| Beyond the Palms Ltd | Other services | 2023 |
| Beyond the Waveuk Ltd | Information & communication | 2025 |
| Beyoutiful Hair,Makeup & Beauty Ltd | Other services | 2022 |
| Bhangu Investment Limited | Real estate | 2024 |
| Bhangu Property Limited | Real estate | 2021 |
| Bharta Homes . Limited | Construction | 2017 |
| Bianca Living Ltd | Real estate | 2023 |
| Bianco Investments Ltd | Real estate | 2021 |
| Biba Overseas Ltd | Real estate | 2024 |
| Biddenham Care Holdings Limited | Financial services | 2018 |
| Biddenham Care Home Limited | Construction | 2019 |
| Biddenham Care Limited | Health & social care | 2019 |
| Big Easy Software Ltd | Information & communication | 2008 |
| Big Red Real Estate Ltd | Real estate | 2022 |
| Big Time Consultancy Limited | Professional & scientific | 2024 |
| Bike Assist Legal Limited | Extraterritorial | 2023 |
| Bike Assist Limited | Extraterritorial | 2023 |
| BIL Enterprises Ltd | Professional & scientific | 2025 |
| Billion Right International UK Ltd | Wholesale & retail | 2023 |
| Billz Equestrian Limited | Arts & recreation | 2012 |
| BIN28 Limited | Wholesale & retail | 2019 |
| Bingo Real Estate Ltd | Real estate | 2025 |