| Bricknell Upholstery Ltd | Manufacturing | 2024 |
| Brickroom Limited | Administrative & support | 2008 |
| Bricks & Mortar Construction Limited | Construction | 2025 |
| Brickstax Construction Limited | Construction | 2019 |
| Bricktok Ltd | Wholesale & retail | 2023 |
| Brickwize Ltd | Real estate | 2025 |
| Brickwork Studio Ltd | Professional & scientific | 2023 |
| Brickwrks Ltd | Real estate | 2024 |
| Brickyard Storage Ltd | Transport & logistics | 2021 |
| Bridford Consulting Limited | Professional & scientific | 2017 |
| Bridge Innes Property Ltd | Real estate | 2024 |
| Bridge Natural Therapies Ltd | Administrative & support | 2014 |
| Bridge Nine Ltd | Wholesale & retail | 2020 |
| Bridge Street Partnership Ltd | Real estate | 2023 |
| Bridge the GAP Child Mental Health C.I.C. | Education | 2019 |
| Bridge Waste Disposal Limited | Water & waste | 2004 |
| Bridgecare Staff Limited | Administrative & support | 2026 |
| Bridgeforth International Ltd | Transport & logistics | 2025 |
| Bridgeside Events Ltd | Hospitality | 2019 |
| Bridgewater Building Services Midlands Limited | Construction | 2017 |
| Bridgewiseprojectsolutions Limited | Construction | 2025 |
| Bridgewood Green Residents Management Company Limited | Households | 2023 |
| Bridgfordian Ltd | Information & communication | 2004 |
| Brief Stay UK Limited | Real estate | 2024 |
| Briefyourmarket International Limited | Extraterritorial | 2008 |
| Brifrey Cleaning Services Ltd | Administrative & support | 2019 |
| Brigantes Walking Holidays Limited | Administrative & support | 2016 |
| Brigdens Limited | Wholesale & retail | 1979 |
| Briggs Property Co Limited | Real estate | 2016 |
| Bright and Gracious UK Ltd | Health & social care | 2023 |
| Bright Beauty Ltd | Other services | 2014 |
| Bright Commercial Laundry Ltd | Administrative & support | 2019 |
| Bright Energy Ltd | Professional & scientific | 2004 |
| Bright Flair Ltd | Information & communication | 2018 |
| Bright Idea Solutions Ltd | Information & communication | 2015 |
| Bright Keys Ltd | Real estate | 2023 |
| Bright Stars Childcare Limited | Education | 2010 |
| Bright Stars Nurseries UK Holdings Limited | Financial services | 2017 |
| Bright Stars Nurseries UK Investments Limited | Education | 2017 |
| Bright Stars Nurseries UK Limited | Education | 2017 |
| Bright Stars Nursery Group Limited | Education | 2016 |
| Bright Stars Nursery Holdings Limited | Financial services | 2016 |
| Bright Stars Nursery Investments Limited | Financial services | 2016 |
| Brightbit Digital Ltd | Information & communication | 2024 |
| Brightbridge Solutions Limited | Information & communication | 2015 |
| Brightbridge Support Services Limited | Extraterritorial | 2017 |
| Brighter Future Care Solutions Ltd | Health & social care | 2024 |
| BRIGHTFUTURE777 Property Investment Ltd | Real estate | 2021 |
| Brightmesh Ltd. | Manufacturing | 2017 |
| Brightside Retail Ltd | Wholesale & retail | 2023 |
| Brightview Health Ltd | Health & social care | 2025 |
| Brilliant Commercial & Industrial Cleaning Group Ltd | Wholesale & retail | 2014 |
| Brilliant Communities C.I.C. | Other services | 2013 |
| Brima Export Ltd | Manufacturing | 2016 |
| Brimwell Group Ltd | Construction | 2026 |
| Brinafood Ltd | Hospitality | 2025 |
| Brindle & Green Limited | Professional & scientific | 2012 |
| Briotic Construction Ltd | Construction | 2021 |
| Brit Hire Limited | Transport & logistics | 2026 |
| Brit Renewables Limited | Financial services | 2019 |
| Britannia Brickwork Derby Limited | Construction | 2014 |
| Briteworq LET Ltd | Real estate | 2026 |
| British Compressed Gases Association | Other services | 1901 |
| British Nordic Walking C.I.C. | Arts & recreation | 2008 |
| British Pest Control Association | Other services | 1982 |
| British Plumbing Employers Council (Training) Limited | Education | 1992 |
| Britons Limited | Transport & logistics | 2008 |
| Britscare Health Solutions Limited | Health & social care | 2023 |
| Britspeed Ltd | Information & communication | 2025 |
| Britvendors Ltd | Wholesale & retail | 2024 |
| Britzay Store Ltd | Wholesale & retail | 2025 |
| Brix (Midlands) Ltd | Construction | 2025 |
| Brix Stays Ltd | Hospitality | 2025 |
| BRK Solutions Limited | Administrative & support | 2008 |
| Brnk Limited | Construction | 2014 |
| BRO2BRO Global Ltd | Wholesale & retail | 2026 |
| Broader Management Limited | Real estate | 2004 |
| Broadhurst Digital Limited | Professional & scientific | 2020 |
| Broadlands (Etwall) Management Company Limited | Households | 2007 |
| Broadlands Family Limited | Financial services | 2019 |
| Broadlands Property Limited | Real estate | 2019 |
| Broadoak Systems Limited | Professional & scientific | 2009 |
| Broadrail Ltd | Professional & scientific | 2022 |
| Broadview Financial Services Ltd | Professional & scientific | 2007 |
| Broadview Wealth Management Limited | Professional & scientific | 2018 |
| Brockies Limited | Construction | 1976 |
| Brockwell Consulting Limited | Professional & scientific | 2015 |
| Brockwellpark Housing Ltd | Real estate | 2024 |
| Bromcross Limited | Construction | 2000 |
| Bromham Bodyworks Ltd | Wholesale & retail | 2014 |
| Brompton Fold Estate Management Company Limited | Households | 2016 |
| Bronze (Eco) Ltd | Agriculture & fishing | 2021 |
| Bronze and Beyond UK Ltd | Other services | 2025 |
| Brook Chase Mews Management Company Limited | Households | 2010 |
| Brook House Repton Limited | Households | 2000 |
| Brook of Life Care Limited | Health & social care | 2019 |
| Brookborough Limited | Financial services | 2010 |
| Brookes & Sowerby Limited | Professional & scientific | 2013 |
| Brookfield Court (Sandiacre) Management Company Limited | Real estate | 2009 |
| Brookfield Farm Property Management Limited | Real estate | 2014 |