| Buttar Ltd | Real estate | 2019 |
| Butter Construction Midlands Ltd | Construction | 2023 |
| Buttons Real Estate Ltd | Real estate | 2017 |
| Buy and Go Shop Ltd | Wholesale & retail | 2026 |
| Buy Clothing Online Ltd | Wholesale & retail | 2021 |
| Buynero Ltd | Wholesale & retail | 2025 |
| Buzzclick Solution Ltd | Information & communication | 2025 |
| BVK Homes Limited | Real estate | 2026 |
| BY Maddison LOU Limited | Other services | 2025 |
| BY Sonica Beauty Limited | Other services | 2025 |
| BY Sonica Limited | Other services | 2024 |
| BY the Woods Limited | Real estate | 2023 |
| BYE to Cancer | Other services | 2011 |
| Byprop Limited | Real estate | 2022 |
| Byrne Civils Ltd | Construction | 2021 |
| Byrne Co Holdings Ltd | Financial services | 2023 |
| Bysummah Beauty Ltd | Other services | 2025 |
| Byte Bliss Limited | Wholesale & retail | 2024 |
| Byte Cart Ltd | Wholesale & retail | 2025 |
| Byte My Tech Ltd | Wholesale & retail | 2014 |
| Bytecraft Pro Ltd | Information & communication | 2026 |
| Bytesoftiq Ltd | Wholesale & retail | 2026 |
| C & B Carpenters Limited | Construction | 2010 |
| C & C Courtney Limited | Real estate | 2025 |
| C & C Transportings Limited | Transport & logistics | 2026 |
| C & E Home Improvement Services Ltd | Construction | 2023 |
| C & G Leisure Ltd | Hospitality | 2024 |
| C and Co Properties Limited | Real estate | 2017 |
| C B Colours Ltd | Administrative & support | 2008 |
| C B Consultant Services Limited | Administrative & support | 2004 |
| C Bourne UK Limited | Financial services | 2022 |
| C Carsales Ltd | Wholesale & retail | 2016 |
| C D E Contractors Limited | Construction | 2012 |
| C E Driver Solutions Ltd | Transport & logistics | 2020 |
| C F Foster (Electrical) Limited | Construction | 2004 |
| C Farm Limited | Construction | 2019 |
| C Harris Project Management Services Ltd | Professional & scientific | 2019 |
| C J Consulting Midlands Limited | Manufacturing | 2019 |
| C Jeavons Carpentry Limited | Construction | 2005 |
| C L Clark Property Ltd | Real estate | 2017 |
| C L M Carpentry & Building Services Ltd | Construction | 2016 |
| C Logistics (North) Ltd | Administrative & support | 2025 |
| C M Community Care Services Limited | Health & social care | 1988 |
| C N C Trading Ltd | Hospitality | 2019 |
| C P Driver Training Services Ltd | Professional & scientific | 2023 |
| C S Labels Limited | Manufacturing | 1976 |
| C Smith Logistics Ltd | Transport & logistics | 2026 |
| C V H Fabrications Limited | Manufacturing | 2008 |
| C&C Fast Ltd | Transport & logistics | 2023 |
| C&C Transporting Logistics Ltd | Transport & logistics | 2024 |
| C&D Holdings (Midlands) Ltd | Real estate | 2017 |
| C&K Labs Limited | Extraterritorial | 2021 |
| C&M Fresh Produce Limited | Wholesale & retail | 2015 |
| C&N Property Developments Limited | Real estate | 2016 |
| C&S Cleaning Ltd | Administrative & support | 2023 |
| C&T Doors and Windows Limited | Manufacturing | 2004 |
| C'Art-Art Transport Ltd | Transport & logistics | 1999 |
| C'Dore Valeting Ltd | Administrative & support | 2018 |
| C-Bridge Research and Eduservices Limited | Wholesale & retail | 2024 |
| C-Rett Limited | Public administration | 2025 |
| C. Johnson Builders (Wednesfield) Limited | Construction | 1992 |
| C. L. Evans Ltd | Administrative & support | 2017 |
| C.A.R. Limited | Arts & recreation | 1990 |
| C.A.S. (Mount Farm) Limited | Construction | 2002 |
| C.A.S.B Limited | Wholesale & retail | 2018 |
| C.And W.Electronics Limited | Manufacturing | 1969 |
| C.H. Harrisons Public Limited Company | Wholesale & retail | 1990 |
| C.H. Shore (Estates) Limited | Real estate | 1990 |
| C.H. Shore (Holdings) Limited | Professional & scientific | 1986 |
| C.H. Shore (Properties) Limited | Real estate | 1986 |
| C.H. Shore (Property Developments) Limited | Real estate | 1983 |
| C.H. Shore Investments Limited | Real estate | 1985 |
| C.He Investment Ltd | Real estate | 2024 |
| C.Humphries Limited | Construction | 1964 |
| C.I. Electrical Limited | Construction | 1997 |
| C.I. Technical Services Limited | Construction | 2010 |
| C.I.A. Telecom Ltd | Construction | 2022 |
| C.J.Jefferies,Limited | Professional & scientific | 1944 |
| C.T.C Civils and Landscaping Ltd | Administrative & support | 2022 |
| C/L Refurbishments Ltd | Manufacturing | 2022 |
| C2F Solutions Ltd | Construction | 2022 |
| C2PO Limited | Real estate | 2026 |
| C4I Solutions Ltd | Professional & scientific | 2024 |
| C9J Limited | Information & communication | 2011 |
| C@Vens Limited | Health & social care | 2021 |
| CA Sprinkler Designs Ltd | Professional & scientific | 2022 |
| CAB Hair Limited | Other services | 2019 |
| Cabcraft Limited | Manufacturing | 2006 |
| Cable Street Breakers Ltd | Wholesale & retail | 2025 |
| Cabled & Co. Technology Ltd | Construction | 2023 |
| Cabled With Care Ltd | Construction | 2025 |
| Cabx Services Ltd | Transport & logistics | 2022 |
| CAD Thermal Insulation Ltd | Construction | 2020 |
| CAD2D Outsourcing Limited | Professional & scientific | 2012 |
| Cadman Engineering (Wolverhampton) Limited | Professional & scientific | 1992 |
| Cadman Property Company Limited | Administrative & support | 2017 |
| Caeparius Limited | Professional & scientific | 1987 |
| Caernarvonshire Crown Slate Quarries Company Limited | Construction | 1932 |
| Caesar Housing Properties Ltd | Real estate | 2024 |
| Cafe 29 Ltd | Hospitality | 2020 |