| Brackstone-Fell Limited | Health & social care | 2025 |
| Bramerton Real Estate (Central) Limited | Real estate | 2022 |
| Bramerton Real Estate Limited | Real estate | 2022 |
| Bramley and Finch Ltd | Professional & scientific | 2025 |
| Brand TAP Bottling Limited | Manufacturing | 2019 |
| Brand TAP Brands Limited | Administrative & support | 2020 |
| Brandhall Court Management Company Limited | Households | 1994 |
| Bras 2 U Ltd | Wholesale & retail | 2007 |
| Brassart Limited | Manufacturing | 1998 |
| Bravo Box Ltd | Wholesale & retail | 2022 |
| Bread and Butter Consulting Ltd | Professional & scientific | 2024 |
| Breakwell Properties Limited | Real estate | 2005 |
| Breakwells LLP | | 2002 |
| Brena Automation Limited | Manufacturing | 2003 |
| Brennan Building Limited | Other services | 2012 |
| Brettell Brothers Limited | Manufacturing | 2010 |
| Brettell Computers Limited | Other services | 2024 |
| Briarley Hill Road Management Limited | Households | 2005 |
| Bricks & Yield Ltd | Real estate | 2025 |
| Bridge Court (Kinver Street) Management Limited | Households | 2018 |
| Bridge Investment Group Limited | Financial services | 2021 |
| Bridge K9 Security Ltd | Administrative & support | 2025 |
| Bridge Property Investments Ltd | Real estate | 2022 |
| Bridge Therapy Ltd | Health & social care | 2017 |
| Bridgtown Engineering Limited | Professional & scientific | 2006 |
| Brier Construction Holdings Limited | Construction | 2019 |
| Brier Construction Limited | Construction | 1983 |
| Brierley Lifting Tackle Company Limited | Wholesale & retail | 1985 |
| Brierley Printers Limited | Manufacturing | 1990 |
| Bright Futures Coaching Ltd | Education | 2024 |
| Brighter Pastures Ltd | Agriculture & fishing | 2022 |
| Brit Floors Ltd | Wholesale & retail | 2022 |
| Brit Tech Services Ltd | Information & communication | 2026 |
| Brit Travel Ltd | Other services | 2016 |
| British Crown Green Bowling Association | Extraterritorial | 2013 |
| BRN Care Ltd | Health & social care | 2014 |
| Broadmarsh Kennels and Cattery Ltd | Health & social care | 2013 |
| Broadway Boilers Ltd | Construction | 2019 |
| Broadway Court (Meir) Management Company Limited | Professional & scientific | 1984 |
| Broadway Windows Limited | Construction | 1999 |
| Broadways Express Ltd Ltd | Wholesale & retail | 2026 |
| Brofec Property Limited | Real estate | 2025 |
| Bromley Hydraulics Limited | Manufacturing | 2014 |
| Brompton Views Letting Limited | Financial services | 2022 |
| Bromsgrove Power Limited | Energy | 2022 |
| Bronx Thermal Technologies Limited | Manufacturing | 2004 |
| Brookdale Common Management Limited | Households | 2026 |
| Brookdale Nursing Home Limited | Extraterritorial | 1992 |
| Brookes Cleaning Contracts Ltd | Administrative & support | 2024 |
| Brookfield ESP Ltd | Professional & scientific | 2018 |
| Brookfield Nurseries Limited | Administrative & support | 2005 |
| Brookson (5143K) Limited | Administrative & support | 2007 |
| Broughton Joinery Limited | Manufacturing | 2019 |
| Broughton Pianos Limited | Wholesale & retail | 2005 |
| Brumjobs Ltd | Professional & scientific | 2025 |
| Brunswick Property Developments Ltd | Extraterritorial | 2024 |
| Bryan Management Limited | Financial services | 2020 |
| Bryjon Construction Limited | Real estate | 1987 |
| BS UK Shop Front Ltd | Construction | 2015 |
| Bsix Group Limited | Real estate | 2018 |
| BSL Olive Tree Group (Church) Limited | Other services | 2022 |
| BT- Multi Trades Ltd | Construction | 2022 |
| Btkf Limited | Other services | 2019 |
| Btsgb Ltd | Professional & scientific | 2016 |
| Btsurveyors Limited | Professional & scientific | 2015 |
| Buddy Land Ltd | Real estate | 2022 |
| BUGGIES4ONE Ltd | Manufacturing | 2020 |
| Build Sales Limited | Information & communication | 2024 |
| Building LAU Limited | Construction | 2026 |
| Building Youth CIC | Education | 2025 |
| Building Youth Support Services Limited | Education | 2025 |
| BUILT2LAST Driveways Limited | Construction | 2025 |
| Bulb Hair and Health Limited | Other services | 2025 |
| Bulk BAG Supplies Limited | Administrative & support | 2006 |
| Bulkside Limited | Real estate | 1985 |
| Bully BOY Limited | Arts & recreation | 2014 |
| Burford Coatings & Cleaning Ltd | Manufacturing | 2026 |
| Burford Court Prospect Limited | Households | 2020 |
| Burj Group Limited | Other services | 2016 |
| Burnley & Evans Limited | Professional & scientific | 2003 |
| Burton Group Holdings Limited | Real estate | 1978 |
| Business Context Limited | Information & communication | 2011 |
| Business Invoice Checker Limited | Financial services | 2011 |
| Butterfly Media Limited | Information & communication | 2008 |
| Buy Wise Cars Limited | Wholesale & retail | 2025 |
| Bvde Quality Solutions Ltd | Professional & scientific | 2023 |
| BVK Retail Limited | Wholesale & retail | 2023 |
| C & C Precision Engineering Services Limited | Manufacturing | 2011 |
| C & E Property Ltd | Real estate | 2019 |
| C & H Pack Services Limited | Real estate | 2011 |
| C & J Elwell Properties Ltd | Real estate | 2024 |
| C 'N C Doors Limited | Manufacturing | 1991 |
| C I Refurbishments Ltd | Construction | 2013 |
| C J Tool and Mouldings Limited | Manufacturing | 2007 |
| C L Hughes Carpentry Limited | Administrative & support | 2008 |
| C Leitner Skin Health and Aesthetics Ltd | Health & social care | 2022 |
| C M Mechanical Ltd | Wholesale & retail | 2025 |
| C N Poole Limited | Financial services | 2002 |
| C P Griffiths IFA Ltd | Financial services | 2007 |
| C R Tetstall Tiling Ltd | Manufacturing | 2008 |