| Blyth View Developments Ltd | Construction | 2023 |
| Bmrr Limited | Health & social care | 2023 |
| Boathouse Field RTM Company Limited | Households | 2019 |
| Bodders Consulting Ltd | Professional & scientific | 2017 |
| Boden Homes & Properties Ltd. | Real estate | 2010 |
| Bodnetts Commercial Limited | Water & waste | 2014 |
| Body Beautiful Day Spa Limited | Other services | 2013 |
| Body Language School Ltd | Other services | 2022 |
| Bojangles Dance Limited | Arts & recreation | 2003 |
| Bold Commercial Ltd | Construction | 2025 |
| Bolehall Limited | Real estate | 1986 |
| Boley Park Limited | Hospitality | 2025 |
| Bonaldo Brown Ltd | Wholesale & retail | 2011 |
| Bonnebaigt Properties Ltd | Real estate | 2023 |
| Bonser Building Contractors Limited | Wholesale & retail | 1985 |
| Boombox Consulting Limited | Administrative & support | 2019 |
| Booze Lichfield Ltd | Wholesale & retail | 2024 |
| Bore ST Bakery Ltd | Manufacturing | 2019 |
| Bore Street Dental Practice 2019 Limited | Health & social care | 2019 |
| Bore Street Dental Practice Limited | Health & social care | 2014 |
| Borrowcop House Management Company Limited | Households | 2004 |
| Boss & Maher Holdings Limited | Real estate | 2022 |
| Boss Risk Solutions Ltd | Financial services | 2021 |
| Bostin Technology Services Ltd. | Professional & scientific | 2013 |
| Boudiams Ltd | Transport & logistics | 2019 |
| Boultons Nursery Ltd | Agriculture & fishing | 2025 |
| Bouncestep Fit Limited | Arts & recreation | 2024 |
| Boundary Building Contractors Limited | Construction | 2024 |
| Bouran Construction Limited | Construction | 2002 |
| Bowbrook Financial Planners Ltd | Financial services | 2020 |
| Bowen Scott Limited | Professional & scientific | 2020 |
| Bowerman Travel Ltd | Administrative & support | 2024 |
| Box Boutique UK Ltd | Wholesale & retail | 2023 |
| Box H Limited | Real estate | 2017 |
| Boxxed UP Ltd | Professional & scientific | 2019 |
| BP Plastering Limited | Construction | 2017 |
| Brabazon Solutions Ltd | Professional & scientific | 2024 |
| Brac Engineers Limited | Energy | 2011 |
| Bradbury Transport Services Limited | Transport & logistics | 2003 |
| Bradgate Fencing Specialists Ltd | Construction | 2005 |
| Bradley Scott Windows Limited | Construction | 1999 |
| Bradshaw & Wright Building & Restoration Consultants Limited | Professional & scientific | 2011 |
| Brainbronze Ltd | Transport & logistics | 2019 |
| Brand Remarkable Limited | Professional & scientific | 2022 |
| Brass Stag Property Ltd | Construction | 2025 |
| BRB Recruitment Ltd | Administrative & support | 2025 |
| Break IT Records Ltd | Information & communication | 2025 |
| Brealey Associates Limited | Professional & scientific | 2000 |
| Breese Transport Ltd | Transport & logistics | 2011 |
| Breslins Lichfield Ltd | Professional & scientific | 2020 |
| Bretby Park Estate Management Company Limited | Households | 1999 |
| BRI Investments Limited | Financial services | 2020 |
| Brian Reid and SON Limited | Manufacturing | 2001 |
| Brian Williams Holdings Limited | Financial services | 1999 |
| Brickbuild Construction (Midlands) Ltd | Construction | 2012 |
| Brickworks Studio Ltd | Professional & scientific | 2018 |
| Bridge 79 Limited | Professional & scientific | 2024 |
| Brief 2 Build Acquisitions Limited | Administrative & support | 2025 |
| Brief 2 Build Holdings Limited | Financial services | 2023 |
| Brief 2 Build Limited | Other services | 2019 |
| Bright Events Ltd | Administrative & support | 2018 |
| Bright Future Housing Ltd | Real estate | 2019 |
| Brighter Bytes Limited | Information & communication | 2021 |
| Brightland Lambert Ltd | Professional & scientific | 2014 |
| Brightland Psychology Ltd | Education | 2022 |
| Brindley Fabrications Ltd | Manufacturing | 2024 |
| Brisley Properties Limited | Real estate | 2017 |
| Bristol and Bath Science Park Estate Management Company Limited | Construction | 2011 |
| Britannia Services (UK) Limited | Construction | 1993 |
| Britannia Services Group Limited | Other services | 1993 |
| British Toxicology Society(The) | Other services | 1982 |
| British Wireless for the Blind Fund | Other services | 1999 |
| Britland Ltd | Real estate | 2024 |
| Brittan Property Group Ltd | Real estate | 2016 |
| Brock Construction Limited | Construction | 2022 |
| Broken Light Bulb C.I.C. | Professional & scientific | 2018 |
| Brooke & Co Construction Ltd | Construction | 2023 |
| Brookes & Co Limited | Manufacturing | 2012 |
| Brookfields Luxury Boarding Limited | Other services | 2017 |
| Brookhouse Knights Limited | Hospitality | 2025 |
| Broomleasow Management Company Limited | Households | 1988 |
| Brothers and Burgers LLP | | 2024 |
| Brownhill Hayward Brown Holdings Limited | Extraterritorial | 2014 |
| Brownhill Hayward Brown Limited | Professional & scientific | 2008 |
| Brumkicks Ltd | Arts & recreation | 2024 |
| Bryan Davies Consultancy Ltd | Administrative & support | 2024 |
| BSA Propco Ltd | Real estate | 2025 |
| Bts-Solutions Ltd | Construction | 2016 |
| Budd Systems Limited | Information & communication | 2013 |
| Budget Garage and Service Centre Limited | Wholesale & retail | 2024 |
| Buffer Bear Nurseries Limited | Professional & scientific | 1995 |
| BUG Bakes Limited | Manufacturing | 2016 |
| Building and Management Solutions Limited | Professional & scientific | 2018 |
| Buildwell Building Contractors Ltd | Construction | 2017 |
| Bulldog Appliances Limited | Wholesale & retail | 2021 |
| Bulpitts Lampshades Limited | Wholesale & retail | 1961 |
| Burford Grange (Ickleford) Management Company Limited | Households | 2023 |
| Burn Consulting Services Limited | Professional & scientific | 2023 |
| Burntwood Happy Paws Limited | Professional & scientific | 2014 |
| Burntwood Interiors Ltd | Construction | 2010 |