| Bradley Engineering Design & Services Ltd | Professional & scientific | 2012 |
| Bradley Nicholls Holdings and Investments Ltd | Financial services | 2025 |
| Braham Holdings and Investments Ltd | Financial services | 2024 |
| Braintree Bungalows Limited | Real estate | 1925 |
| Bramford Cafe Ltd | Hospitality | 2026 |
| Bramford Hardware Limited | Wholesale & retail | 2012 |
| Brandabubble Ltd | Manufacturing | 2026 |
| Brandwood Properties Limited | Real estate | 1971 |
| Brandy & Partners Ltd | Professional & scientific | 2022 |
| Breakthroughmarketing Ltd. | Manufacturing | 2008 |
| Breslins Dudley Ltd | Professional & scientific | 2020 |
| Brettell Pizza Ltd | Hospitality | 2026 |
| Brewster Developments Group Ltd | Construction | 2022 |
| Bri-Mac Engineering Limited | Professional & scientific | 1992 |
| Brick Street Dentures Holdings Ltd | Financial services | 2025 |
| Brick Street Dentures Ltd | Health & social care | 2025 |
| Bridge Aluminium Cylinder Company Limited | Transport & logistics | 2023 |
| Bridge Heating & Property Services Ltd | Construction | 2008 |
| Bridgemill Sections Limited | Manufacturing | 1995 |
| Bridgemill Steel Sections Limited | Manufacturing | 2004 |
| Bridgepoint RO UK CIC | Professional & scientific | 2025 |
| Bridgeways Group Ltd | Information & communication | 2020 |
| Bridgewell Property Limited | Real estate | 2025 |
| Bridgnorth Tool & Hire Limited | Wholesale & retail | 2024 |
| Brierley Data Solutions Limited | Information & communication | 2008 |
| Briggson Limited | Professional & scientific | 2011 |
| Bright Blue Property Limited | Real estate | 2015 |
| Bright Blue Ventures Limited | Financial services | 2013 |
| Bright Green Ideas Limited | Professional & scientific | 2013 |
| Bright Structures Limited | Manufacturing | 2016 |
| Brightsun Builders Ltd | Construction | 2020 |
| Brik Finance Limited | Financial services | 2018 |
| Brit Brick Homes Ltd | Real estate | 2024 |
| Brit Fabrics Limited | Wholesale & retail | 2011 |
| Brit Supply Limited | Wholesale & retail | 2024 |
| Brit Tint Limited | Wholesale & retail | 2025 |
| Britannia Bar & Restaurant Ltd | Hospitality | 2026 |
| Britannia Brewing Co Ltd | Manufacturing | 2024 |
| Britannia Goods Trading Ltd | Wholesale & retail | 2026 |
| Britannia Grill Ltd | Hospitality | 2024 |
| Britannia Pizza, Kebab and Fish Bar Limited | Hospitality | 2019 |
| Britannia Roofing & Building Limited | Construction | 2014 |
| Britannia Venture Limited | Hospitality | 2018 |
| British Timken Limited | Manufacturing | 1997 |
| Brixton Fitness Limited | Arts & recreation | 2023 |
| Brockington Securities Limited | Construction | 2021 |
| Brockswood at Cotwall END | Professional & scientific | 2009 |
| Broen-Lab Ltd. | Wholesale & retail | 1974 |
| Brooding Secret Ltd | Information & communication | 2024 |
| Brooke Cherith Health Care Services Ltd | Health & social care | 2023 |
| Brookes & Sons (Property) Limited | Real estate | 1961 |
| Brookes Holdings & Investments Ltd | Financial services | 2020 |
| Brookfield Pallets Limited | Manufacturing | 2001 |
| Brooks Blooms Ltd | Agriculture & fishing | 2024 |
| Brown-Rutter(Dudley) Limited | Extraterritorial | 2014 |
| Brownswall Ltd | Wholesale & retail | 2026 |
| Brumont LDN Limited | Administrative & support | 2020 |
| Brumont Limited | Administrative & support | 2017 |
| Bsara Co Ltd | Wholesale & retail | 2026 |
| BSL Consultants Limited | Professional & scientific | 2024 |
| BSL Developments (Shropshire) Ltd | Real estate | 2026 |
| BSM Recovery and Transport Services Ltd | Wholesale & retail | 2025 |
| BST Decorating Ltd | Construction | 2023 |
| Bstd Estates Ltd | Real estate | 2026 |
| BT Transport and Cleaning Ltd | Transport & logistics | 2018 |
| BTF Construction Limited | Construction | 2012 |
| BTF Lettings Ltd | Real estate | 2023 |
| BTF Property Ltd | Real estate | 2017 |
| BTN Auto Breakers Ltd | Wholesale & retail | 2026 |
| Btsd Limited | Real estate | 2020 |
| BTW Business Advisory Ltd | Professional & scientific | 2026 |
| BTW Group Investments Ltd | Financial services | 2026 |
| BTW Holdings and Investments Ltd | Financial services | 2019 |
| BTW Holdings Ltd | Financial services | 2025 |
| Buckley & Buckley Property Ltd | Real estate | 2021 |
| Buffazz Ltd | Wholesale & retail | 2023 |
| Build and Construct Ltd | Real estate | 2020 |
| Build Futures CIC | Health & social care | 2026 |
| Build Logic Consultants Limited | Professional & scientific | 2025 |
| Build.Tune.Race Ltd | Wholesale & retail | 2020 |
| Builders Bar & Grill Ltd | Hospitality | 2025 |
| Builders TM Ltd | Construction | 2025 |
| Building Block Limited | Real estate | 1997 |
| Built Websites Ltd | Information & communication | 2025 |
| Bula Bula Limited | Financial services | 2024 |
| Bulb. Flower Studio Limited | Wholesale & retail | 2019 |
| Bulldog Consulting Ltd | Professional & scientific | 2026 |
| Bullfit Sports Limited | Manufacturing | 2025 |
| Bullfits 110 Ltd | Wholesale & retail | 2025 |
| Bunny and Blanket Limited | Real estate | 2020 |
| Burhan Bari Limited | Information & communication | 2014 |
| Burnett & Lewis (Humidryers, Spares & Services) Limited | Administrative & support | 2015 |
| Burnt Tree Auto Centre Ltd. | Wholesale & retail | 2010 |
| Burradon Ltd | Administrative & support | 2021 |
| Busby's Kitchens & Interiors Ltd | Construction | 2026 |
| Bushell Capital Limited | Real estate | 2024 |
| Business Consultancy Group (1957) Limited | Administrative & support | 2024 |
| Business Development Projects Limited | Professional & scientific | 1996 |
| Butco Mechanical Services Ltd | Wholesale & retail | 2016 |
| Butec Business Machines Limited | Manufacturing | 2005 |