| Burlynskey Ltd | Manufacturing | 2023 |
| Burnden Park Sports Limited | Arts & recreation | 2015 |
| Burndred Engineering Limited | Administrative & support | 2007 |
| Burnside Investments Limited | Professional & scientific | 1972 |
| Burnt Stew Property Investment LLP | | 2012 |
| Burntastic Ltd | Administrative & support | 2010 |
| Burnz Telecoms Limited | Administrative & support | 2015 |
| Buro Property Ltd | Real estate | 2025 |
| Burola Ltd | Wholesale & retail | 2024 |
| Burprop Investments Limited | Real estate | 2017 |
| Burprop Limited | Construction | 2020 |
| Burrage Environmental Advisory Limited | Administrative & support | 2024 |
| Burt Business Services Limited | Other services | 2016 |
| Burtonclay Ltd | Construction | 2023 |
| Burtonwood Construction Services Ltd | Construction | 2014 |
| Bushcable Limited | | 1982 |
| Bushpig IT Projects Ltd | Information & communication | 2023 |
| Business Analyst Resource Limited | Administrative & support | 2011 |
| Business Data Experts Limited | Information & communication | 2014 |
| Business Derivatives Limited | Professional & scientific | 2008 |
| Business Doctors Franchising (US) Limited | Professional & scientific | 2016 |
| Business Doctors Group Limited | Administrative & support | 2015 |
| Business Doctors International Limited | Professional & scientific | 2016 |
| Business Doctors Limited | Professional & scientific | 2004 |
| Business Perform Ltd | Professional & scientific | 2019 |
| Business to Business Services Ltd | Professional & scientific | 2019 |
| Business-Ology UK Ltd | Professional & scientific | 2020 |
| Busy Investments Limited | Financial services | 2024 |
| Busy Soda Ltd | Hospitality | 2023 |
| Busybreakfast Limited | Wholesale & retail | 2025 |
| Butler & Bell Limited | Administrative & support | 2017 |
| Butler & Morabito Ltd | Other services | 2023 |
| Butt Radiology Ltd | Health & social care | 2024 |
| Buttercross Hall (Management Company) Limited | Households | 2025 |
| Buttercup View Residents Management Company Limited | Households | 2026 |
| Butterfly Business Solutions Ltd | Professional & scientific | 2025 |
| Buttermarket Bars Limited | Hospitality | 2026 |
| Buttermarket Properties Ltd | Real estate | 2019 |
| Button Tech UK Limited | Information & communication | 2019 |
| Buttondene Limited | Administrative & support | 2006 |
| Buvo Ltd | Professional & scientific | 2024 |
| BUY4LET Ltd | Real estate | 2019 |
| Buydefinition Limited | Wholesale & retail | 2015 |
| Buywell Super Discount Centre Limited | Real estate | 1970 |
| Buzasi Trans Ltd | Transport & logistics | 2020 |
| Buzme Media Limited | Information & communication | 2011 |
| Buzz Building Services Ltd | Construction | 2017 |
| Bvlp LLP | | 2012 |
| BVM Technology Limited | Information & communication | 2015 |
| BW Consultants (NW) Ltd | Administrative & support | 2023 |
| BWC Offshore Ltd | Other services | 2019 |
| BWF Group Holdings Ltd | Financial services | 2025 |
| BWF Ltd | Real estate | 2020 |
| Bwfc Limited | Extraterritorial | 2019 |
| Bwfc Sports TV Ltd | Arts & recreation | 2023 |
| Bwfc TV Ltd | Arts & recreation | 2023 |
| Bwhf LLP | | 2020 |
| BXP Transformation Consulting Limited | Information & communication | 2026 |
| BY the Sword VFX Ltd | Information & communication | 2014 |
| Byapok Ltd | Hospitality | 2025 |
| Byerley Energy Limited | Energy | 2014 |
| Byerley Group Limited | Financial services | 2016 |
| Bytescape IT Ltd | Information & communication | 2013 |
| Bzmg Security Solutions Ltd | Administrative & support | 2018 |
| C & C Bruce Ltd | Health & social care | 2010 |
| C & C Chow's Limited | Real estate | 2020 |
| C & G Mobile Truck and Trailer Repairs Ltd | Wholesale & retail | 2018 |
| C & J Fisher Limited | Wholesale & retail | 2016 |
| C & J Systems Limited | Professional & scientific | 2017 |
| C & M Consultants Limited | Real estate | 2010 |
| C & M Hair and Beauty Ltd | Other services | 2012 |
| C & R Property Investments Limited | Real estate | 2018 |
| C Alex & Co Ltd | Health & social care | 2012 |
| C B Thomson Limited | Administrative & support | 2012 |
| C Brown Cafe Ltd | Hospitality | 2025 |
| C C Flooring Ltd | Construction | 2017 |
| C C MAC Limited | Administrative & support | 2009 |
| C C Ngwu Ltd | Information & communication | 2018 |
| C E Transport Ltd | Transport & logistics | 2026 |
| C Griffin Paving Company Limited | Construction | 2020 |
| C H Commercial Management Limited | Professional & scientific | 2025 |
| C H SAP Solutions Ltd | Hospitality | 2022 |
| C J Associates (NW) Ltd | Professional & scientific | 2009 |
| C J Cleggs Ltd | Construction | 2026 |
| C J Jones Ltd | Real estate | 2025 |
| C L R a Properties Ltd | Real estate | 2024 |
| C Lunt Electrical Ltd | Professional & scientific | 2021 |
| C M Jones Technology Solutions Limited | Administrative & support | 2016 |
| C M P Properties (Wales) Limited | Real estate | 2004 |
| C M P Properties Limited | Real estate | 2002 |
| C P Accounting and Financial Services Limited | Financial services | 2013 |
| C Squared Architects Ltd | Professional & scientific | 2016 |
| C Stamp Limited | Administrative & support | 2013 |
| C T Electrical (Warrington) Limited | Construction | 1998 |
| C W Martin Consulting Ltd | Professional & scientific | 2021 |
| C Waine Enterprises Ltd | Administrative & support | 2023 |
| C Winter Building Consultancy Limited | Professional & scientific | 2016 |
| C&A Electrical Solutions Ltd | Administrative & support | 2026 |
| C&A Engineering Design Ltd | Professional & scientific | 2019 |
| C&A General Solutions Ltd | Construction | 2024 |