| C Sellers Limited | Health & social care | 2012 |
| C Smith IT Services Ltd | Information & communication | 2025 |
| C Tranter Building Services Ltd | Construction | 2012 |
| C Winder & Company Ltd | Construction | 2012 |
| C&A Plumbing & Heating Limited | Construction | 2023 |
| C&A Property Group Ltd | Financial services | 2019 |
| C&B-Ns Properties Ltd | Real estate | 2021 |
| C&C Construction Services Limited | Construction | 2021 |
| C&C Living Solutions Limited | Health & social care | 2025 |
| C&Cspeed Ltd | Transport & logistics | 2019 |
| C&G Advisory Holdings Limited | Financial services | 2025 |
| C&G Advisory Limited | Professional & scientific | 2025 |
| C&H Corporations Limited | Other services | 2025 |
| C&Hr UK Ltd | Transport & logistics | 2022 |
| C&J Property Investments Ltd | Real estate | 2022 |
| C&J Timber Limited | Wholesale & retail | 2026 |
| C&M (Leicester) Limited | Other services | 2017 |
| C&M Investment Properties Ltd | Real estate | 2019 |
| C&M Janeke Property Investments Ltd | Real estate | 2025 |
| C&M TRANSPORT71LTD Limited | Transport & logistics | 2025 |
| C&N Transport Ltd | Transport & logistics | 2026 |
| C&P Express Ltd | Transport & logistics | 2025 |
| C&P Stores Limited | Wholesale & retail | 2021 |
| C&P Trustees Ltd | Professional & scientific | 2020 |
| C&R Creations Ltd | Real estate | 2022 |
| C&S Cables Limited | Construction | 2020 |
| C&S Electrical Services Ltd | Construction | 2022 |
| C&S Trailer Ltd | Hospitality | 2026 |
| C-Bz Properties Ltd | Real estate | 2025 |
| C-Design Construction Services Ltd | Real estate | 2017 |
| C-Gardens-Em Ltd | Administrative & support | 2025 |
| C. Cooper (Florists) Limited | Real estate | 1975 |
| C. Henry & Sons Limited | Construction | 2002 |
| C. J. B. Printing Equipment Limited | Other services | 1994 |
| C. J. Upton (Demergeco) Limited | Financial services | 2022 |
| C. J. Upton Investments Limited | Financial services | 2022 |
| C. L. Children’S Homes Consultancy Ltd | Professional & scientific | 2025 |
| C. Lock & Sons Limited | Construction | 2026 |
| C.& P.Wilson Limited | Wholesale & retail | 1929 |
| C.A.B Estates Ltd | Real estate | 2018 |
| C.F. & G.K. Harris Limited | Construction | 2002 |
| C.G Investments (Leic) Ltd | Real estate | 2017 |
| C.H.E.F.S Ltd | Manufacturing | 2022 |
| C.J. Upton Holdings Ltd. | Professional & scientific | 1997 |
| C.J.W. Property Limited | Real estate | 2002 |
| C.K. & Sons Limited | Wholesale & retail | 2003 |
| C.N.C. Punching Limited | Manufacturing | 1980 |
| C.N.F Cleaning Ltd | Transport & logistics | 2020 |
| C.S. Trimmings Limited | Wholesale & retail | 2001 |
| C.Sochirca Ltd | Transport & logistics | 2022 |
| C.Wesson Limited | Real estate | 1961 |
| C2E Construction Limited | Construction | 2021 |
| C2S Holdco Ltd | Financial services | 2024 |
| C2S Investments Ltd | Real estate | 2018 |
| C2S Property Refurb Ltd | Real estate | 2023 |
| C3 Action Limited | Wholesale & retail | 2011 |
| C3 Construction Group Limited | Financial services | 2017 |
| C3 Construction Holdings Limited | Financial services | 2015 |
| C3 Construction Limited | Construction | 2003 |
| C4 Group Holdings Ltd | Professional & scientific | 2022 |
| C4 Trading Ltd | Wholesale & retail | 2023 |
| C4D Technology Limited | Information & communication | 2023 |
| CA Technology Solutions Limited | Other services | 2015 |
| Caasa Properties Ltd | Real estate | 2024 |
| Cabd ALI Ltd | Information & communication | 2026 |
| Cabe Engineering UK Ltd. | Manufacturing | 2011 |
| Cable Automation Ltd | Information & communication | 2026 |
| Cableology Limited | Other services | 2012 |
| Cably Ltd | Transport & logistics | 2024 |
| Caboodle & KIT Ltd | Construction | 2025 |
| Cabregister Ltd | Administrative & support | 2025 |
| Cabtracker Ltd | Administrative & support | 2025 |
| Cactus Content Ltd | Professional & scientific | 2019 |
| Cadeleigh Value Ltd | Transport & logistics | 2014 |
| Cadet Engineering Limited | Administrative & support | 1995 |
| Cadford Limited | Wholesale & retail | 1985 |
| Cadle Broom Ltd | Wholesale & retail | 2025 |
| Cadogan Square (CM) Limited | Real estate | 2023 |
| Cadware Ltd | Information & communication | 2020 |
| Caerus Investments Limited | Professional & scientific | 2011 |
| Caesius Ltd | Extraterritorial | 2016 |
| Caeta Limited | Manufacturing | 2021 |
| Cafe 804 Limited | Hospitality | 2024 |
| Cafe Blends Ltd | Wholesale & retail | 2015 |
| Cafe Colombia Limited | Manufacturing | 2025 |
| Cafe Conexion Stores Limited | Hospitality | 2018 |
| Cafe Corner Leicester Ltd | Hospitality | 2025 |
| Cafe Cosmo Limited | Extraterritorial | 2012 |
| Cafe Daniel Ltd | Hospitality | 2019 |
| Cafe DE Triv Ltd | Hospitality | 2017 |
| Cafe Fatima Limited | Hospitality | 2025 |
| Cafe IT Limited | Hospitality | 2019 |
| Cafe LA Blanche Ltd | Hospitality | 2018 |
| Cafe Mariam Ltd | Hospitality | 2023 |
| Cafe Nirob Ltd | Hospitality | 2019 |
| Cafe Pronto Limited | Other services | 1990 |
| Cafe Republic Limited | Wholesale & retail | 2010 |
| Cafe Ventoux 1951 Limited | Wholesale & retail | 2015 |
| Cafee Europa (UK) Ltd | Wholesale & retail | 2017 |
| Cafhe Limited | Professional & scientific | 2019 |