| Bukhara London Ltd | Administrative & support | 2016 |
| Bulbrook Associates Ltd | Professional & scientific | 2014 |
| Bulgaria International Medical Students Alliance CIC | Education | 2024 |
| Bullards Beers Limited | Manufacturing | 2018 |
| Bulldog Developments & Consultancy Ltd | Construction | 2014 |
| Bulldog Films Ltd | Information & communication | 2015 |
| Bulldog Offshore Services Limited | Professional & scientific | 2002 |
| Bullen 1921 Limited | Professional & scientific | 2015 |
| Bullen Brothers Limited | Real estate | 2015 |
| Bullen Developments Limited | Professional & scientific | 2015 |
| Bullen Estates Commercial Ltd | Real estate | 2020 |
| Bullen Estates Management Ltd | Real estate | 2023 |
| Bullen Estates Norfolk Ltd | Real estate | 2023 |
| Bullen Estates UK Limited | Real estate | 2017 |
| Bullen Group Limited | Construction | 1971 |
| Bullen Homes Limited | Professional & scientific | 1999 |
| Bullen Investments Limited | Real estate | 1984 |
| Bullen Limited | Professional & scientific | 1997 |
| Bullen NO.2 Limited | Real estate | 2012 |
| Bullen Power Limited | Energy | 2023 |
| Bullen Properties Limited | Real estate | 2006 |
| Bullen Residential Properties Limited | Extraterritorial | 1999 |
| Bulleys Limited | Wholesale & retail | 2006 |
| Bulton Construction Limited | Construction | 1997 |
| Bumblebee Catering Ltd | Wholesale & retail | 2019 |
| Bumbles Holdings Limited | Real estate | 2024 |
| Bump Inventories Ltd | Wholesale & retail | 2022 |
| Bumper to Bumper Auto Services Ltd | Wholesale & retail | 2026 |
| BUN & Peri Ltd | Hospitality | 2020 |
| Bunker 25 Limited | Hospitality | 2021 |
| Bunn Scaffolding Ltd | Construction | 2012 |
| Bunny Duck Design Limited | Information & communication | 2018 |
| Buntingford Law Limited | Professional & scientific | 2023 |
| Bunwell Consultants Limited | Professional & scientific | 2019 |
| Buonappetite Ltd | Hospitality | 2021 |
| Buoys Engineering Limited | Professional & scientific | 2019 |
| Buraq Cooling Ltd | Construction | 2024 |
| Buraq Electric Ltd | Construction | 2023 |
| Burbrooke Ltd | Information & communication | 2021 |
| Burch Financial Group Ltd | Financial services | 2026 |
| Burdock Homes Ltd | Hospitality | 2011 |
| Burdon Grange Energy Centre Limited | Energy | 2020 |
| Bure Auto Centre Commercials Ltd | Wholesale & retail | 2025 |
| Bure Auto Centre Ltd | Wholesale & retail | 2023 |
| Bure Navigation Conservation Trust Limited | Professional & scientific | 2011 |
| Bure Properties Limited | Real estate | 2017 |
| Bure Solar Limited | Construction | 2011 |
| Bure Valley Adventures Limited | Arts & recreation | 2005 |
| Bure Valley Classics Ltd | Wholesale & retail | 2019 |
| Bure Valley Electrical Services Ltd | Construction | 2019 |
| Bure Valley Properties Limited | Construction | 2000 |
| Bure Valley Woodburners Ltd | Construction | 2013 |
| Burford Bakery Solutions Limited | Administrative & support | 2012 |
| Burge Enterprise Ltd | Hospitality | 2025 |
| Burgeon Property Limited | Real estate | 2021 |
| Burger Town Ltd | Hospitality | 2019 |
| Burgershack Birmingham Limited | Hospitality | 2017 |
| Burgess Construction Services Limited | Construction | 2022 |
| Burgess Tractors Ltd | Extraterritorial | 2025 |
| Burgh Plumbing and Heating Services Ltd | Wholesale & retail | 2002 |
| Burgoyne Properties Limited | Real estate | 2004 |
| Burley Group Limited | Extraterritorial | 2022 |
| Burlingham Estate Shoot Limited | Agriculture & fishing | 1996 |
| Burlingham Fencing and Paving Supplies Limited | Manufacturing | 2024 |
| Burlingham Memorial Solutions Limited | Other services | 2011 |
| Burlingham Paving & Fencing Limited | Manufacturing | 2015 |
| Burn Baby Studio Limited | Manufacturing | 2021 |
| Burnbank Energy Centre Limited | Energy | 2021 |
| Burnellkmanagement Ltd | Hospitality | 2026 |
| Burnham Farms Estate Limited | Professional & scientific | 2020 |
| Burnham Farms Limited | Agriculture & fishing | 2020 |
| Burnham Lodge Freehold Limited | Households | 2017 |
| Burnham Lodge RTM Company Limited | Households | 2014 |
| Burning Crow Tattoo Co Ltd | Other services | 2024 |
| Burning Issues Consulting Ltd | Professional & scientific | 2021 |
| Burning Shed Limited | Wholesale & retail | 2006 |
| Burnley Limited | Administrative & support | 2006 |
| Burns Warner Limited | Construction | 2006 |
| Burnside Estate Company Holdings Ltd | Agriculture & fishing | 2019 |
| Burntfen Flowers Limited | Wholesale & retail | 2020 |
| Buro Bari Limited | Hospitality | 2018 |
| Burr Computer Environments UK Limited | Construction | 2021 |
| Burrage & Associates Ltd | Agriculture & fishing | 2021 |
| Burrell Holdings Ltd | Financial services | 2020 |
| Burroughes Business Developments Ltd | Professional & scientific | 2011 |
| Burroughs Consulting Ltd | Professional & scientific | 2013 |
| Burrow Property Services Limited | Real estate | 2025 |
| Burrow Stack Limited | Information & communication | 2023 |
| Burrows & Falconer Limited | Health & social care | 2018 |
| Burrows of Holt Limited | Extraterritorial | 1984 |
| Bursa Kebab and Pizza Ltd | Hospitality | 2025 |
| Burtco Ltd | Professional & scientific | 2011 |
| Burton & Partners LLP | | 2023 |
| Burton Access & Equipment Hire Ltd | Administrative & support | 2025 |
| Burton Clinic Limited | Health & social care | 2025 |
| Burton Commercial Ltd | Professional & scientific | 2026 |
| Burton Cove Estate Management Ltd | Real estate | 2024 |
| Burton DEX Limited | Financial services | 2023 |
| Burton Holdings Limited | Professional & scientific | 2020 |
| Burton Investments Group Ltd | Hospitality | 2019 |