| Bridport Foundry+ Ltd | Construction | 2026 |
| Brierley FOX Estates Limited | Construction | 2022 |
| Brierley Hill Ltd | Other services | 2017 |
| Bright Beginnings Education Limited | Education | 2025 |
| Bright Build and Manage Ltd | Construction | 2026 |
| Bright Cloud Software Limited | Information & communication | 2023 |
| Bright Crown Customs Ltd | Wholesale & retail | 2019 |
| Bright ERA Ltd | Professional & scientific | 2025 |
| Bright Estate Planning Ltd | Administrative & support | 2017 |
| Bright Horizon Developments Ltd | Construction | 2025 |
| Bright Path Mediation C.I.C. | Education | 2025 |
| Bright Red Creative Solutions Limited | Professional & scientific | 2002 |
| Bright Roof Limited | Administrative & support | 2017 |
| Bright Skies Limited | Real estate | 2022 |
| Bright Spark Electrical Contractors Ltd | Construction | 2025 |
| Bright Spark Future CIC | Construction | 2025 |
| Bright Tech Services Limited | Information & communication | 2025 |
| Bright Wealth Limited | Financial services | 2009 |
| Bright Windows and Doors Limited | Manufacturing | 2019 |
| Brightbridge Ecom Ltd | Wholesale & retail | 2026 |
| Brighter Mindset CIC | Education | 2016 |
| Brightlinelogistics Limited | Transport & logistics | 2026 |
| Brighton One Limited | Hospitality | 2006 |
| Brightside Wellbeing Ltd | Health & social care | 2023 |
| Brij Dhody Limited | Financial services | 2017 |
| Brikto Ltd | Wholesale & retail | 2026 |
| Brilliance Unlimited Ltd | Education | 2013 |
| Brilliant African Stores Ltd | Wholesale & retail | 2024 |
| Brilliant Blue Logistics Limited | Transport & logistics | 2024 |
| Brilliant Contracts (B'Ham) Ltd | Construction | 2018 |
| Brimonn (GB) Limited | Manufacturing | 2007 |
| Brina Resources Limited | Health & social care | 2020 |
| Brincars Limited | Wholesale & retail | 1972 |
| Brindhavan Manor Ltd | Real estate | 2025 |
| Bring ME Beauty Limited | Other services | 2017 |
| Brinsford Consulting Limited | Information & communication | 2019 |
| Brinsford Holdings Limited | Financial services | 2022 |
| Brio Enterprises Limited | Administrative & support | 2010 |
| Brio Global Limited | Information & communication | 2025 |
| Briq Holdings Ltd | Wholesale & retail | 2023 |
| Brit Baazar Limited | Wholesale & retail | 2025 |
| Brit Nexus Limited | Financial services | 2018 |
| Brit Seller Limited | Wholesale & retail | 2024 |
| Britannia Byte & Buy Ltd | Wholesale & retail | 2025 |
| Britannia Financial Services Limited | Financial services | 2018 |
| Britannia GB Traders Ltd | Wholesale & retail | 2025 |
| Britannic Wealth Limited | Financial services | 2013 |
| Britax Accountants Ltd | Professional & scientific | 2015 |
| Britbuyuk Limited | Wholesale & retail | 2025 |
| Britecore Soutions Limited | Wholesale & retail | 2026 |
| British Chiropractic Association | Other services | 1984 |
| British Mensa Limited | Other services | 1970 |
| British Obesity Society | Health & social care | 2011 |
| British Troops Remembered CIC | Other services | 2021 |
| Britlink Express Ltd | Transport & logistics | 2025 |
| Britlink FM Ltd | Administrative & support | 2025 |
| Briture Limited | Wholesale & retail | 2025 |
| BRITVALUE97 Ltd | Wholesale & retail | 2026 |
| Brix & Mortar Lettings Ltd | Real estate | 2020 |
| Brmg Consulting Ltd | Professional & scientific | 2015 |
| Broad Express Ltd | Wholesale & retail | 2021 |
| Broad ST Convenience Store Ltd | Wholesale & retail | 2026 |
| Broadbridge Merchantile Limited | Real estate | 2026 |
| Broadgate Partners Limited | Professional & scientific | 2009 |
| Broadlands Leisure (Holdings) Limited | Financial services | 2022 |
| Broadlands Leisure Limited | Arts & recreation | 2020 |
| Broadlands Wolverhampton Limited | Real estate | 2002 |
| Broadmount Limited | Other services | 2017 |
| Broadoak Housing Ltd | Real estate | 2021 |
| Broadway Stage 2 Limited | Real estate | 2018 |
| Broadway Wines Lodge Ltd | Wholesale & retail | 2024 |
| Brockweir ASG Limited | Information & communication | 2002 |
| Bromley Butchers Ltd | Wholesale & retail | 2020 |
| Bromley Repaints Ltd | Wholesale & retail | 2025 |
| Bromove Ltd | Wholesale & retail | 2023 |
| Bronteg Properties Limited | Real estate | 2014 |
| Brookes & CO.(1925)LIMITED | Professional & scientific | 1925 |
| Brookhouse Construction Ltd | Construction | 2021 |
| Brooklands Drives and Patios Limited | Construction | 2021 |
| Brooklands Parade Chippy Ltd | Hospitality | 2023 |
| Broomhall Smith Property Group Ltd | Households | 2024 |
| Broth Ltd | Hospitality | 2025 |
| Brother Home Improvement Ltd | Construction | 2024 |
| Brothers Freight Ltd | Wholesale & retail | 2025 |
| Brourne Enterprises Limited | Other services | 2013 |
| Brow Box Birmingham Limited | Wholesale & retail | 2024 |
| Brow Box Limited | Wholesale & retail | 2018 |
| Brow Box Wolverhampton Limited | Wholesale & retail | 2020 |
| Browns Integrity Services Ltd | Construction | 2017 |
| Browns Mews Management Limited | Real estate | 2017 |
| BRS Estates Ltd | Real estate | 2025 |
| BRS Property Group Limited | Real estate | 2025 |
| Brueton Limited | Financial services | 2019 |
| Brukah Global Services Limited | Wholesale & retail | 2016 |
| Brunch Bite Limited | Hospitality | 2003 |
| Brunchfest UK Ltd | Hospitality | 2019 |
| Brunel Marine Coatings Sales Limited | Manufacturing | 2015 |
| Brunovicks Limited | Transport & logistics | 2017 |
| Brushstrokes Group Limited | Financial services | 2021 |
| Bruster Ltd | Real estate | 2020 |