| Burberry Properties Limited | Extraterritorial | 2003 |
| Burger & Pizza Rooms Ltd | Hospitality | 2026 |
| Burger Camden Limited | Hospitality | 2021 |
| Burger N BUN Limited | Hospitality | 2025 |
| Burger Triangolo Ltd | Hospitality | 2025 |
| Burgess Shaping Stone Ltd | Manufacturing | 2024 |
| Burgharde Ltd | Agriculture & fishing | 2021 |
| Burgon & Ball Limited | Manufacturing | 1986 |
| Burke&Son Engineering Limited | Construction | 2025 |
| Burkett Quicksign Ltd | Manufacturing | 2023 |
| Burkeway Homes Ltd | Real estate | 2018 |
| Burkinshaw Co-Ordination Services Ltd | Professional & scientific | 2025 |
| Burley Precision Engineering Limited | Manufacturing | 2003 |
| Burlix Scaffolding Ltd | Construction | 2025 |
| Burn-Rate Ltd | Professional & scientific | 2020 |
| Burnand X. H. Components Limited | Professional & scientific | 1979 |
| Burnarts Ltd | Other services | 2018 |
| Burncross Consultancy Ltd | Professional & scientific | 2025 |
| Burncross Heating Limited | Construction | 2009 |
| Burner Solutions Limited | Construction | 2007 |
| Burngreave Holdings South Yorkshire Ltd | Financial services | 2011 |
| Burngreave Services Ltd | Wholesale & retail | 2011 |
| Burngreave Works and Wellbeing Community Interest Company | Administrative & support | 2011 |
| Burning Socks Limited | Arts & recreation | 2017 |
| Burns Court (Burncross Road) Management Company Limited | Households | 1994 |
| Burns Investment Properties Ltd | Real estate | 2026 |
| Burns Medical Group Ltd | Wholesale & retail | 2024 |
| Burnt Stones Property Limited | Construction | 2013 |
| Burnwood Management Services Ltd | Health & social care | 2025 |
| Burp Streetfood Ltd | Hospitality | 2024 |
| Burrell’S Plant & Equipment Hire Ltd | Transport & logistics | 2025 |
| Burritos & More Ltd | Hospitality | 2025 |
| Burritos Y MAS Ltd | Hospitality | 2021 |
| Burrowlee Park Square Management Company Limited | Households | 2015 |
| Burst Marketing Ltd | Professional & scientific | 2019 |
| Burtenshaw Properties Ltd | Real estate | 2016 |
| Burton Anthony Ltd | Administrative & support | 2012 |
| Burton Peak Properties Ltd | Real estate | 2019 |
| Bury Social Ltd | Hospitality | 2026 |
| BUS and Truck Parts (UK) Limited | Wholesale & retail | 2024 |
| BUS Stop VW Limited | Wholesale & retail | 2013 |
| Busabar Spa Ltd | Other services | 2025 |
| Bush Lane Developments Limited | Construction | 2022 |
| Bushra & SON Ltd | Health & social care | 2022 |
| Bushra Consultancy Ltd | Health & social care | 2024 |
| Bushra Traders Limited | Wholesale & retail | 2025 |
| Bushwood Group Limited | Other services | 2023 |
| Bushy Park Activity Camp Ltd | Other services | 2024 |
| Business & Trends Limited | Administrative & support | 2022 |
| Business Admin Services Ltd | Professional & scientific | 2023 |
| Business Ambassador Consulting Group Ltd | Professional & scientific | 2017 |
| Business Boosters Network Community Interest Company | Education | 2006 |
| Business Careware Limited | Information & communication | 1995 |
| Business Finance Supermarket Limited | Financial services | 2012 |
| Business Immigration UK Ltd | Professional & scientific | 2023 |
| Business Innovation Limited | Professional & scientific | 2017 |
| Business Interiors Direct Limited | Administrative & support | 2004 |
| Business Marketing Solutions Limited | Professional & scientific | 2009 |
| Business Research and Consultancy Ltd | Information & communication | 2023 |
| Business Risk and Compliance Experts Ltd | Professional & scientific | 2022 |
| Business Selling Experts Ltd | Administrative & support | 2023 |
| Business Supplies Direct (Holdings) Limited | Professional & scientific | 2007 |
| Business Supplies Direct Limited | Administrative & support | 1999 |
| Business-By-Referral Ltd | Professional & scientific | 2026 |
| Businessanalysishub Ltd | Information & communication | 2017 |
| Bussinbala Ltd | Hospitality | 2025 |
| Busy Bees Commercial Ltd | Administrative & support | 2020 |
| Busysky (Adwick Park) Ltd | Real estate | 2022 |
| Busysky (Clyde Road) Ltd | Real estate | 2022 |
| Busysky (Kendall) Ltd | Real estate | 2022 |
| Busysky (Savile Park) Ltd | Real estate | 2022 |
| Busysky (Sutherland Street) Ltd | Real estate | 2022 |
| Busysky Developments Ltd | Construction | 2022 |
| Busysky Holdings Limited | Financial services | 2022 |
| Busysky Limited | Real estate | 1988 |
| Butcher & Catch Limited | Hospitality | 2017 |
| Butcher Box Ltd | Wholesale & retail | 2026 |
| Butcher Residential (Denby Dale) Limited | Real estate | 2015 |
| Butcher Residential (Yorkshire) Limited | Real estate | 2017 |
| Butcher Residential Limited | Real estate | 2009 |
| Butcher Works Management Company Limited | Real estate | 2006 |
| Butchers and Drovers Charitable Institution | Other services | 2014 |
| Bute Nathan and Solomon Limited | Other services | 2015 |
| Butler Engineering Solutions Ltd | Professional & scientific | 2019 |
| Butler Places Ltd | Real estate | 2020 |
| Butlers Balti House Limited | Hospitality | 2005 |
| Butlers Estate Agents Ltd | Real estate | 2007 |
| Butlershaulage Ltd | Transport & logistics | 2025 |
| Butta LA Pasta Ltd | Hospitality | 2017 |
| Butter Knife Ltd | Professional & scientific | 2026 |
| Buttercup Pet Products Limited | Wholesale & retail | 2023 |
| Butterell & Co. Limited | Hospitality | 2025 |
| Butterfield Quad 2 Management Company Limited | Real estate | 2021 |
| Butterfield Quad Management Company Limited | Real estate | 2019 |
| Butterfly Children Services Ltd | Health & social care | 2022 |
| Buttermere Motor Company Ltd | Wholesale & retail | 2026 |
| Butterworths Law Limited | Extraterritorial | 2014 |
| Buxton Associates Ltd | Professional & scientific | 2019 |
| Buxton Property Holdings Limited | Real estate | 2016 |
| Buy IT NOW Online Ltd | Wholesale & retail | 2025 |