| Bricksense Properties Ltd | Real estate | 2024 |
| Bricksuk Limited | Manufacturing | 2008 |
| Brickworks Property Limited | Real estate | 2017 |
| Bridal Cape Co. Ltd | Wholesale & retail | 2026 |
| Briddon Construction Limited | Construction | 2015 |
| Briddon Limited | Construction | 2012 |
| Bride Box Limited | Extraterritorial | 2018 |
| Bride of Christ Home Ltd | Other services | 2018 |
| Bridge Bakery Ltd | Hospitality | 2022 |
| Bridge END Builders Ltd | Construction | 2018 |
| Bridge Road Welwyn (2) Limited | Construction | 2020 |
| Bridge Street Kebab Ltd | Hospitality | 2026 |
| Bridge the GAP Productions Limited | Professional & scientific | 2019 |
| Bridge to Care Housing Limited | Health & social care | 2023 |
| Bridgedale House (Fulwood) Limited | Health & social care | 2017 |
| Bridgeway Global Group (Bwgg) Ltd | Financial services | 2026 |
| Bridgeway Operations Ltd | Professional & scientific | 2024 |
| Bridgewood Health Care Limited | Health & social care | 2002 |
| Bridgnect Co., Limited | Hospitality | 2017 |
| Bridgstock Holdings Limited | Financial services | 2022 |
| Bridie Brows Ltd | Other services | 2024 |
| Bridlington Bay Properties Ltd | Real estate | 2024 |
| Bridlington Property Services Limited | Administrative & support | 2003 |
| Brierley Field Children's Nursery Limited | Health & social care | 2017 |
| Brierley Field Limited | Real estate | 2016 |
| Briery Busk Management Company Limited | Real estate | 1997 |
| Brigantia Learning Trust Limited | Education | 2013 |
| Brigantia New Start AP School | Education | 2025 |
| Brigg Estate & Management Limited | Real estate | 2025 |
| Brigg Property Management Limited | Households | 2025 |
| Brigghthorizon Analytics Limited | Information & communication | 2025 |
| Briggs Services Ltd | Wholesale & retail | 2022 |
| Briggs Snooker & Pool Ltd | Arts & recreation | 2017 |
| Bright Beginners Nursery Ltd | Education | 2016 |
| Bright Beginnings (SY) Ltd | Health & social care | 2024 |
| Bright Bids Ltd | Other services | 2021 |
| Bright Cleaning Services Ltd | Administrative & support | 2024 |
| Bright Cover Ltd | Financial services | 2017 |
| Bright Futures Consultancy Limited | Education | 2016 |
| Bright Gray Creative Limited | Manufacturing | 2019 |
| Bright Gray Loft Interiors Limited | Wholesale & retail | 2020 |
| Bright Moon Limited | Wholesale & retail | 2025 |
| Bright Morning Star Ltd | Health & social care | 2020 |
| Bright Move Investments Ltd | Real estate | 2019 |
| Bright Sight Mission | Extraterritorial | 2012 |
| Bright Skies Day Nursery Limited | Health & social care | 2020 |
| Bright Sunlight Company Ltd | Construction | 2014 |
| Bright Technologies Limited | Other services | 1997 |
| Bright Web Development Ltd | Information & communication | 2025 |
| Brightenroad Ltd | Hospitality | 2025 |
| Brightiz Ltd | Wholesale & retail | 2019 |
| Brightman Clarke Architects Limited | Professional & scientific | 2016 |
| Brighton Broadcasting Ltd | Information & communication | 2021 |
| Brighton Street Light Limited | Hospitality | 2016 |
| Brightpad Ltd | Hospitality | 2018 |
| Brightpath Housing Solutions Ltd | Hospitality | 2025 |
| Brightside Foods Limited | Hospitality | 2015 |
| Brightside Motors Repair Centre Ltd | Wholesale & retail | 2023 |
| Brightside Music CIC | Arts & recreation | 2017 |
| Brightstar Bins Ltd | Administrative & support | 2018 |
| Brightstar Shotblasting & Coatings Limited | Manufacturing | 1998 |
| Brigstock Enterprises Limited | Hospitality | 2025 |
| Brikely Limited | Construction | 2024 |
| Brilliant Auctions Ltd | Wholesale & retail | 2021 |
| Brilliant Barkers Limited | Education | 2019 |
| Brilliant Bike Funding Limited | Extraterritorial | 2019 |
| Brilliant Funding Limited | Professional & scientific | 2018 |
| Brilliant Motor Finance Limited | Professional & scientific | 2018 |
| Brillora Commercial UK Ltd | Administrative & support | 2026 |
| Brimington Pharmacy Limited | Extraterritorial | 1958 |
| Brin-Oaks Management Company Limited | Households | 2013 |
| Brincliffe Bees Community Education CIC | Education | 2025 |
| Brincliffe Business Solutions Ltd | Professional & scientific | 2014 |
| Brincliffe Catering Ltd | Hospitality | 2024 |
| Brincliffe Court Flats Company Limited | Households | 1962 |
| Brincliffe Estates Ltd | Real estate | 2024 |
| Brincliffe Limited | Information & communication | 2010 |
| Brincliffe Properties Ltd | Real estate | 2017 |
| Brind Strange Ltd | Financial services | 2021 |
| Brine Events Ltd | Hospitality | 2026 |
| Bringing IT ALL Back Home Ltd | Wholesale & retail | 2016 |
| Brisklook Limited | Real estate | 1994 |
| Brit Pallets Limited | Wholesale & retail | 2020 |
| Brit Trends Limited | Wholesale & retail | 2024 |
| Brit Wall Ltd | Construction | 2016 |
| Brit-Eng Estates Ltd | Real estate | 2026 |
| Brit-Eng Ltd | Manufacturing | 2025 |
| Brit-Scaff Limited | Construction | 2012 |
| Britan Pharma Limited | Wholesale & retail | 2023 |
| Britannia Cafe & Coffee House Ltd | Hospitality | 2025 |
| Britannia Home Security Ltd | Construction | 2019 |
| Britannia Pharmaceutical Distributors Ltd | Wholesale & retail | 2023 |
| Britannia Precision Engineering Limited | Manufacturing | 1997 |
| Britazon Ltd | Wholesale & retail | 2023 |
| Brite Vision Ltd | Financial services | 2016 |
| British Amateur Boxing Association Limited | Arts & recreation | 2008 |
| British Business Access Lending Limited | Financial services | 2026 |
| British Business Aspire Holdco Ltd | Financial services | 2014 |
| British Business Bank PLC | Financial services | 2013 |
| British Business Finance Ltd | Financial services | 2014 |