| Brimir & Blainn Ltd | Information & communication | 2025 |
| Brit Built Customs Limited | Wholesale & retail | 2018 |
| Brit Touch Cleaning Limited | Administrative & support | 2024 |
| Britannic Group Limited | Hospitality | 2021 |
| British Reading Oasis and Discovery Limited | Information & communication | 2024 |
| British Swimming Limited | Arts & recreation | 2000 |
| British Thoracic Oncology Group | Other services | 2015 |
| British Triathlon Foundation Trust | Arts & recreation | 2010 |
| British Volleyball Federation | Arts & recreation | 2008 |
| Britlink Global Ltd | Wholesale & retail | 2025 |
| Brittle Bone Medicine Limited | Professional & scientific | 2014 |
| Broadford Limited | Real estate | 2023 |
| Broadleaf Midlands Tree Care Ltd | Agriculture & fishing | 2021 |
| Broadley Pierce Property Ltd | Real estate | 2023 |
| Broadline Ltd | Wholesale & retail | 2024 |
| Broadthorpe Limited | Construction | 1962 |
| Brod Star Ltd | Wholesale & retail | 2022 |
| Bromakin Holdings Limited | Financial services | 2015 |
| Bromakin Limited | Manufacturing | 1983 |
| Bromwich Book-Keeping Company Limited | Professional & scientific | 2005 |
| Bronze Green Properties Ltd | Real estate | 2022 |
| Brook House Consulting Midlands Limited | Construction | 2014 |
| Brook Rise Ltd | Extraterritorial | 2019 |
| Brooklands Developments Leicester Ltd | Construction | 2019 |
| Brookline Consult Limited | Administrative & support | 2026 |
| Brooks Family Ltd | Professional & scientific | 2013 |
| Brooks of Leicester Limited | Wholesale & retail | 2009 |
| Brooksby Enterprises Limited | Hospitality | 1993 |
| Brooksby Natural Resources Limited | Mining & quarrying | 1996 |
| Brooksfilms Ltd | Professional & scientific | 2026 |
| Brookside Developments (Loughborough) Limited | Construction | 1998 |
| Broomfield Education Consulting Limited | Information & communication | 2025 |
| Broomhill Developments (South) Ltd | Real estate | 2010 |
| Brothertonboy Ltd | Professional & scientific | 2014 |
| Broughton Allen Limited | Administrative & support | 2021 |
| Broughton Brothers Ltd | Extraterritorial | 1993 |
| Broughton Shoe Limited | Extraterritorial | 2018 |
| Brown & Kirby Limited | Construction | 1971 |
| Browne Fostering Limited | Health & social care | 2019 |
| Brpaintservice Ltd | Construction | 2025 |
| Brunsleigh Croft Management Company Limited | Extraterritorial | 2012 |
| Brush Group Limited | Financial services | 2022 |
| Brush Power Distribution Limited | Financial services | 2022 |
| Brush Transformers Limited | Manufacturing | 1957 |
| Bryans Design Limited | Information & communication | 2012 |
| Bryer One Limited | Hospitality | 2011 |
| Brykke Ltd | Real estate | 2026 |
| Bryway Limited | Real estate | 1998 |
| Bsporty Limited | Information & communication | 2020 |
| Buckchi Ltd | Wholesale & retail | 2020 |
| Buckley & Bosch Properties Ltd | Real estate | 2025 |
| Buckley Property Investments Ltd | Real estate | 2018 |
| Buddon Homes Limited | Construction | 2025 |
| Buildcraft and Co. Ltd | Construction | 2015 |
| Buildcraft Homes Ltd | Construction | 2024 |
| Building Works Contracts Ltd | Construction | 2010 |
| Built by Bison Ltd | Manufacturing | 2013 |
| Built Environment Consulting (Energy) Ltd | Wholesale & retail | 2013 |
| BUK Money Ltd | Administrative & support | 2026 |
| BUK Money Tax Limited | Other services | 2026 |
| Bulk Freight (Midlands) Limited | Transport & logistics | 1987 |
| Bulk Minerals Limited | Wholesale & retail | 1988 |
| Bulk Recycling Limited | Professional & scientific | 1987 |
| Bulldog Bespoke Ltd | Construction | 2025 |
| Bullish Services Ltd | Information & communication | 2023 |
| Bumble Properties Ltd | Real estate | 2023 |
| Bumpkin Dairy Co Limited | Hospitality | 2019 |
| Bungee Boutique Ltd | Health & social care | 2025 |
| Bunnyhill Pet Crematorium Ltd | Water & waste | 2025 |
| Bunoosh Ltd | Education | 2025 |
| Burgess Estates and Lettings Ltd | Real estate | 2026 |
| Burton Gardens & Maintenance Ltd | Administrative & support | 2025 |
| Burton Small Ltd | Professional & scientific | 2021 |
| Business Influence Group Limited | Other services | 2018 |
| Business Language Champions Ltd | Education | 2011 |
| Business Print Solutions Limited | Transport & logistics | 1997 |
| Butarose Limited | Administrative & support | 2014 |
| Butler Aviation Ltd | Transport & logistics | 2017 |
| Buttarazzi Holdings Ltd | Real estate | 2021 |
| Buttercup Commercial Limited | Real estate | 2026 |
| Buttercup Management Company Limited | Households | 2018 |
| Buttonbashergames.Co.Uk Ltd | Wholesale & retail | 2024 |
| Buyituk.Co Limited | Extraterritorial | 2011 |
| BV Video Engineering Ltd. | Professional & scientific | 2025 |
| Bvalue Venture Limited | Wholesale & retail | 2024 |
| BW Windscreens Limited | Wholesale & retail | 2026 |
| Bwlch-Y-Cibau Fish Ltd | Other services | 2019 |
| BX404 Limited | Professional & scientific | 2018 |
| Bytenest Ltd | Wholesale & retail | 2025 |
| C & B S Limited | Construction | 2025 |
| C & M Property Installations Limited | Construction | 2014 |
| C & P Fabrications Ltd | Manufacturing | 2022 |
| C D Hutton Limited | Administrative & support | 2013 |
| C Jennings Construction Consultants Ltd | Construction | 2003 |
| C Knight & Co Limited | Financial services | 2020 |
| C P & T Holdings Ltd | Real estate | 2024 |
| C Student Services Limited | Real estate | 1998 |
| C Tadman Limited | Administrative & support | 2022 |
| C&C Airport Taxi Service Ltd | Transport & logistics | 2018 |
| C&D Theatrical Productions Limited | Administrative & support | 2023 |