| Building Environments Maintaining Environments Ltd | Construction | 2023 |
| Buildright (M/C) Ltd | Construction | 2006 |
| Built Alliance Ltd | Real estate | 2020 |
| Built by Lumi Limited | Construction | 2023 |
| Buland Sher Ltd | Wholesale & retail | 2025 |
| Bulkara Limited | Professional & scientific | 2014 |
| Bulletproof Cycling Ltd | Education | 2024 |
| Bulmar-Bn 777 Ltd | Transport & logistics | 2023 |
| Bulmer Landscaping Ltd | Administrative & support | 2022 |
| Bunchy Company Ltd. | Wholesale & retail | 2017 |
| Bundahsi Consulting Ltd | Professional & scientific | 2026 |
| Bungee Digital Ltd | Extraterritorial | 2013 |
| Bunkerbay Ltd | Arts & recreation | 2024 |
| Bunnies Underwear Ltd | Wholesale & retail | 2023 |
| Bunny Group Limited | Wholesale & retail | 2019 |
| Burch Interiors Ltd | Construction | 2005 |
| Burcombe Investments Ltd | Professional & scientific | 2011 |
| Bureau Nala Limited | Information & communication | 2022 |
| Burecho Ltd | Wholesale & retail | 2023 |
| Buried Elephant Limited | Arts & recreation | 2019 |
| Burleigh Park Management Limited | Households | 1981 |
| Burling Terrace Freehold Limited | Households | 2021 |
| Burnaby Developments Limited | Construction | 2024 |
| Burngate Residents Association Limited | Households | 1980 |
| Burnsall PAY Ltd | Administrative & support | 2023 |
| Burnwood Chimneys Limited | Construction | 2016 |
| Burritos Bell Ltd | Hospitality | 2023 |
| Burrows Limited | Construction | 2003 |
| Burrwood Carpentry Limited | Construction | 2018 |
| Burton & Mills Limited | Real estate | 2024 |
| Burton & Towers Ltd. | Wholesale & retail | 1998 |
| Burton Plastering Limited | Construction | 2007 |
| Burwood RTM Limited | Households | 2008 |
| Bushby Marine Ltd | Manufacturing | 2023 |
| Business Continuity Management Limited | Administrative & support | 2021 |
| Business Energy Plus Ltd | Administrative & support | 2025 |
| Business Marketing Strategies Limited | Information & communication | 2018 |
| Business Process Improvement Consulting Services Limited | Professional & scientific | 2008 |
| Business Solution Units Ltd | Information & communication | 2025 |
| Busreinvented.Com Limited | Professional & scientific | 2017 |
| Busy Bees Domestic Cleaning Limited | Administrative & support | 2002 |
| Busy Boots Limited | Professional & scientific | 2025 |
| Butcher and Verity Ltd | Arts & recreation | 2022 |
| Bute Design Ltd | Professional & scientific | 2020 |
| Butt Organization Ltd | Wholesale & retail | 2025 |
| Buttercups Empire Limited | Wholesale & retail | 2021 |
| Butterflies Day Care Stafford Limited | Education | 2017 |
| Buyzio Limited | Wholesale & retail | 2025 |
| Buzz Around Ltd | Wholesale & retail | 2001 |
| Buzz Networks Limited | Information & communication | 1996 |
| BV Carpentry Services Ltd | Other services | 2018 |
| BVC Poole Ltd | Wholesale & retail | 2026 |
| Bwtr Ltd | Professional & scientific | 2021 |
| BXB Boxing UK Ltd | Wholesale & retail | 2025 |
| Bxufang Limited | Professional & scientific | 2023 |
| BY Anna Social Limited | Administrative & support | 2022 |
| BY Jigsaw Ltd | Administrative & support | 2025 |
| BY Tiny Tots Toys Limited | Wholesale & retail | 2025 |
| BYK Trans Ltd | Transport & logistics | 2026 |
| Byron House Limited | Extraterritorial | 1997 |
| Bytebeam Limited | Information & communication | 2022 |
| Byteideas Ltd | Information & communication | 2023 |
| Bytes Ahead Ltd | Administrative & support | 2007 |
| Byvolyn Ltd | Wholesale & retail | 2024 |
| C Bailey Accountants Ltd | Professional & scientific | 2020 |
| C D L Investments Ltd | Real estate | 2014 |
| C E S L Projects Limited | Information & communication | 2013 |
| C J Stores Limited | Wholesale & retail | 2012 |
| C M Partridge Ltd | Professional & scientific | 2025 |
| C P C (Worcester) Limited | Wholesale & retail | 1997 |
| C P Glazing Ltd | Construction | 2023 |
| C S P 35 Limited | Real estate | 2014 |
| C Serve Holdings Limited | Professional & scientific | 2021 |
| C Serve Limited | Wholesale & retail | 2004 |
| C Spectrum Ltd | Wholesale & retail | 2023 |
| C&A Bars Ltd | Hospitality | 2022 |
| C&A Inns Ltd | Hospitality | 2022 |
| C&A Leisure Ltd | Hospitality | 2019 |
| C&A Navigation Ltd | Hospitality | 2023 |
| C&A Travens Ltd | Hospitality | 2022 |
| C&C Contractors (Poole) Limited | Construction | 2008 |
| C&C Investments Ltd | Financial services | 2019 |
| C&C Professional Services Ltd | Professional & scientific | 2018 |
| C&S Roofing Services (Southern) Ltd | Construction | 2022 |
| C-Wavepower Ltd | Professional & scientific | 2024 |
| C. Compton (Haulage) Limited | Transport & logistics | 1956 |
| C. Compton Limited | Wholesale & retail | 1950 |
| C.E.S. (Poole) Limited | Manufacturing | 1996 |
| C.H.G. Holdings Limited | Professional & scientific | 1994 |
| C.R Acquisitions Limited | Professional & scientific | 2011 |
| C.R.S. Electrical (Holdings) Limited | Professional & scientific | 2018 |
| C.R.S. Electrical Supplies Limited | Wholesale & retail | 1992 |
| C.T. Production Limited | Manufacturing | 1982 |
| C.T.C.I. (Technology) Limited | Professional & scientific | 1987 |
| C21 Vehicle Enhancement Ltd | Wholesale & retail | 2025 |
| C2C Consultancy Limited | Other services | 2018 |
| C3 Software Limited | Information & communication | 2001 |
| C3IA Ltd | Information & communication | 2020 |
| C3IA Properties Ltd | Information & communication | 2022 |
| C3IA Solutions Limited | Information & communication | 2006 |