| Buster and Bertie Ltd | Wholesale & retail | 2024 |
| Busyladies Ltd | Health & social care | 2020 |
| Butcher Group Holdings Limited | Financial services | 2025 |
| Butcher Property Co Ltd | Real estate | 2025 |
| Butler & Sullivan Property Ltd | Real estate | 2024 |
| Butler Properties (Doncaster) Ltd | Real estate | 2026 |
| Butlers Medical Ltd | Health & social care | 2022 |
| Butsakon Thai Massage, Nails and Beauty Ltd | Other services | 2021 |
| Butt Houses Limited | Households | 2019 |
| Buttercross Financial Limited | Financial services | 2015 |
| Buttercrumb Bakery Ltd | Extraterritorial | 2026 |
| Butterfly Kisses Events Limited | Administrative & support | 2020 |
| Buzau Mini Limited | Wholesale & retail | 2025 |
| Buzwair Limited | Financial services | 2026 |
| Buzz Ballz Ltd | Wholesale & retail | 2025 |
| Buzz Bees Childminders Limited | Health & social care | 2025 |
| Buzz Dale 2018 Ltd | Administrative & support | 2002 |
| Buzz Wireless Networks Holdings Ltd | Financial services | 2023 |
| Buzz Wireless Networks Limited | Manufacturing | 2020 |
| Buzzmobile and NET Ltd | Wholesale & retail | 2021 |
| BW Integrated Systems UK Limited | Manufacturing | 2004 |
| BW Timber Limited | Wholesale & retail | 2019 |
| BWA Distributions Ltd | Wholesale & retail | 2026 |
| BWH Civils Ltd | Professional & scientific | 2020 |
| BWJ E-Commerce Ltd | Wholesale & retail | 2024 |
| BY Chloe Ltd | Other services | 2026 |
| BY Evolution Creative Factory UK Ltd | Information & communication | 2023 |
| BYB Tuition Limited | Education | 2018 |
| Byrne Aesthetics Limited | Other services | 2020 |
| Byronteknisk Ltd | Professional & scientific | 2019 |
| BYTE8 Ltd | Information & communication | 2025 |
| Bytecare Technologies Ltd | Wholesale & retail | 2025 |
| Byteharbour Digital Ltd | Extraterritorial | 2025 |
| C & B Property Ventures Ltd | Real estate | 2026 |
| C & D Bathrooms Limited | Construction | 2023 |
| C & E Limited | Manufacturing | 2005 |
| C & M Fast Foods Ltd | Wholesale & retail | 2005 |
| C & T Technology Limited | Construction | 2015 |
| C and H Joinery Limited | Construction | 2015 |
| C B Building Contractors Limited | Construction | 2016 |
| C Clark Properties Ltd | Real estate | 2024 |
| C Contor Limited | Transport & logistics | 2024 |
| C F Erector Property Limited | Hospitality | 2024 |
| C F Erectors Limited | Construction | 2019 |
| C F R Restoration Limited | Administrative & support | 2019 |
| C Foley Motors Limited | Wholesale & retail | 2026 |
| C G Conisbrough Limited | Other services | 2016 |
| C Hodgson TM Ltd | Other services | 2021 |
| C Hub for Studies and Consulting Ltd | Information & communication | 2025 |
| C J Business Support Limited | Professional & scientific | 2000 |
| C J Crampton (Properties) Limited | Real estate | 2021 |
| C J Crampton Limited | Water & waste | 2017 |
| C J Financial Planning Limited | Extraterritorial | 2010 |
| C J Group Limited | Professional & scientific | 2012 |
| C J Home Services Limited | Construction | 2008 |
| C J Logan Limited | Public administration | 2016 |
| C J Wealth Management Limited | Extraterritorial | 2010 |
| C J Windscreens Limited | Wholesale & retail | 2011 |
| C L Medicall AID Limited | Administrative & support | 2009 |
| C L Networks Ltd | Other services | 2024 |
| C L S Properties (Doncaster) Limited | Administrative & support | 2005 |
| C Luke TM Ltd | Construction | 2021 |
| C M Developments (Yorkshire) Limited | Construction | 2008 |
| C P Moss Ltd | Professional & scientific | 2016 |
| C Porter Ltd | Professional & scientific | 2024 |
| C R Building Solutions Limited | Construction | 2017 |
| C R Homes ( Doncaster ) Limited | Real estate | 2023 |
| C R M Energy Ltd | Professional & scientific | 2017 |
| C RAY Civils Ltd | Construction | 2019 |
| C Wall Joinery Limited | Construction | 2015 |
| C White Resurfacing Limited | Construction | 2025 |
| C&A Removals and Clearances LLP | | 2026 |
| C&C Insideout Cleaning Services Ltd | Administrative & support | 2025 |
| C&C Read Limited | Households | 2023 |
| C&C Transport Ltd | Transport & logistics | 2024 |
| C&D (Yorkshire) Limited | Construction | 2021 |
| C&E Caravans Limited | Real estate | 2026 |
| C&E Trans Ltd | Transport & logistics | 2021 |
| C&F Cleaning Ltd | Administrative & support | 2026 |
| C&K Decorators Ltd | Extraterritorial | 2025 |
| C&M Autos Ltd | Wholesale & retail | 2020 |
| C&M Autos Storage Ltd | Transport & logistics | 2025 |
| C&M Nica Ltd | Transport & logistics | 2025 |
| C&M Property Rental Management Limited | Real estate | 2022 |
| C&N Hardy Driver Services Ltd | Transport & logistics | 2014 |
| C&R Contractors Ltd | Construction | 2024 |
| C&R Leisure Doncaster Limited | Hospitality | 2018 |
| C&R Property Holdings Limited | Financial services | 2019 |
| C&S Interiors Doncaster Ltd | Other services | 2025 |
| C-Lect Medical Limited | Manufacturing | 2000 |
| C. and P. Rothwell Limited | Hospitality | 1960 |
| C.A BIN Cleaning Services Ltd | Administrative & support | 2025 |
| C.A. Prime Solutions Ltd | Transport & logistics | 2024 |
| C.B.F. Limited | Arts & recreation | 1999 |
| C.C. Electrical Limited | Wholesale & retail | 2004 |
| C.C.Jones Property Developers Ltd | Construction | 2024 |
| C.E.C. Consultancy Limited | Professional & scientific | 2016 |
| C.E.M Couriers Ltd | Transport & logistics | 2018 |
| C.H. Power Tools Limited | Manufacturing | 2000 |
| C.H. Property Developments Limited | Real estate | 2023 |