| Burnley Coach Hire Limited | Transport & logistics | 2018 |
| Burnley Propco Limited | Financial services | 2025 |
| Burns Bootcamp Ltd | Education | 2025 |
| Burns Female Training Ltd | Health & social care | 2026 |
| Burns Supplements Ltd | Wholesale & retail | 2025 |
| Burns Welding Supplies Ltd | Wholesale & retail | 2019 |
| Burnsall Associates Limited | Hospitality | 2017 |
| Burnsall Associates Trustees Limited | Administrative & support | 2025 |
| Burnson Limited | Real estate | 2021 |
| Burrow Green Planning Ltd | Professional & scientific | 2026 |
| Burrows Investment Group Limited | Wholesale & retail | 2024 |
| Burrows Investments (Harrogate) Limited | Real estate | 2026 |
| Burrows Tax Accounting Limited | Professional & scientific | 2016 |
| Bursk Limited | Wholesale & retail | 2020 |
| Burstoffruit.Com Limited | Information & communication | 2009 |
| Burt Hill Ltd | Construction | 2012 |
| Burtenshaws Limited | Professional & scientific | 2007 |
| Burtmarsh Property Group Ltd | Real estate | 2025 |
| Burton Antiques Limited | Wholesale & retail | 2017 |
| Burton House Management Company Limited | Households | 1986 |
| Burton Regan Limited | Administrative & support | 2016 |
| Bury Motor Cycle Centre Limited | Professional & scientific | 2003 |
| Burzt Drinks Ltd | Manufacturing | 2025 |
| BUS and Coach Limited | Financial services | 2007 |
| Busfeild Arms LLP | | 2010 |
| Bushell&Sons Construction Ltd | Construction | 2020 |
| Bushell's Transport Ltd | Transport & logistics | 2025 |
| Business Against Crime in Leeds C.I.C. | Administrative & support | 2005 |
| Business Agent Limited | Professional & scientific | 2013 |
| Business Beautician Limited | Professional & scientific | 2015 |
| Business Beverages (South West) Limited | Extraterritorial | 1997 |
| Business Coaches Yorkshire Limited | Professional & scientific | 2018 |
| Business Communicate Limited | Information & communication | 2008 |
| Business Core Ltd | Information & communication | 2022 |
| Business Creations Limited | Information & communication | 1998 |
| Business Efficiency Solutions Ltd | Wholesale & retail | 2022 |
| Business Finance Advice Ltd | Professional & scientific | 2023 |
| Business Fixer Services Ltd | Professional & scientific | 2020 |
| Business Horsepower Ltd | Professional & scientific | 2011 |
| Business Information Technology Limited | Information & communication | 2016 |
| Business Mentoring (Yorkshire) Limited | Professional & scientific | 2007 |
| Business Network Connection Ltd | Professional & scientific | 2024 |
| Business NO. 1 Limited | Hospitality | 2023 |
| Business of Traders Ltd | Information & communication | 2023 |
| Business Over Here Limited | Wholesale & retail | 2018 |
| Business Restart Limited | Professional & scientific | 2022 |
| Business Scalability Limited | Professional & scientific | 2025 |
| Business Tax Solutions Ltd | Information & communication | 2025 |
| Business Trans Limited | Wholesale & retail | 2023 |
| Business UP Limited | Administrative & support | 2025 |
| Business Works UK Ltd | Professional & scientific | 2008 |
| Businessautomation.Ai Limited | Information & communication | 2025 |
| Businesswatch UK Fire and Security Limited | Administrative & support | 2001 |
| Businesswatch UK Holdings Limited | Financial services | 2007 |
| BUSMONT2 Ltd | Administrative & support | 2021 |
| Buster White Ltd | Hospitality | 2018 |
| Busy Boss Ltd | Hospitality | 2024 |
| Buta Topco Limited | Financial services | 2019 |
| Butho Limited | Health & social care | 2013 |
| Butler & Hargreaves Limited | Construction | 1975 |
| Butler Air Conditioning Limited | Construction | 2004 |
| Butler Business Intelligence Ltd | Information & communication | 2014 |
| Butler Roofing Services Limited | Construction | 2020 |
| Butler Security Installations Limited | Administrative & support | 2012 |
| Butler's Barbering Limited | Other services | 2022 |
| Buttercup Web Ltd | Information & communication | 2012 |
| Butterfield Property Ltd | Real estate | 2017 |
| Butterflies Occupational Therapy Limited | Health & social care | 2021 |
| Butterfly Effect Group Limited | Education | 2016 |
| Butterfly Rentals Ltd | Real estate | 2025 |
| Butterworth Spengler (Cyclesure) Limited | Financial services | 1981 |
| Butterworth Spengler Commercial Limited | Financial services | 2004 |
| Butterworth Spengler Group Limited | Financial services | 2020 |
| Butterworth Spengler Holdings Limited | Professional & scientific | 2004 |
| Butterworth Spengler Professional Risks Limited | Financial services | 2009 |
| Butterworth Spengler South West Limited | Financial services | 1997 |
| Butterworths Solicitors LLP | | 2012 |
| Button's Joinery Limited | Manufacturing | 2009 |
| Buubu London Limited | Wholesale & retail | 2025 |
| Buxton Coates Holdings Limited | Professional & scientific | 2023 |
| Buxton Coates Solicitors Limited | Professional & scientific | 2015 |
| Buy BTL Limited | Real estate | 2025 |
| Buy Nowt LS6 CIC | Arts & recreation | 2021 |
| Buy Prime Ltd | Real estate | 2021 |
| Buy Refurb Rent Ltd | Real estate | 2022 |
| Buy to LET Direct Limited | Financial services | 2008 |
| Buy With Ease Ltd | Real estate | 2018 |
| Buy-Investment-Properties Limited | Real estate | 2007 |
| Buyapart Ltd | Wholesale & retail | 2022 |
| Buybuycar Ltd | Wholesale & retail | 2022 |
| Buyevents Limited | Wholesale & retail | 2025 |
| Buyletgo Limited | Real estate | 2025 |
| Buymakola Ltd | Wholesale & retail | 2020 |
| Buyness Limited | Administrative & support | 2025 |
| Buyshez Ltd | Wholesale & retail | 2026 |
| Buzn Ltd | Information & communication | 2025 |
| Buzz and Drinkz Limited | Wholesale & retail | 2025 |
| Buzz Blocks Ltd | Real estate | 2025 |
| Buzz Club City Ltd | Other services | 2023 |
| Buzz Community Sport Limited | Information & communication | 2024 |