| C Total Trans Limited | Wholesale & retail | 2020 |
| C Transport ( London) Ltd | Transport & logistics | 2019 |
| C W Headdress Limited | Manufacturing | 1996 |
| C&A Civil Engineering Ltd | Construction | 2021 |
| C&A Construction Services Ltd. | Construction | 2017 |
| C&B Derngate Ltd | Other services | 2011 |
| C&C Brick Ltd | Construction | 2025 |
| C&C Cars Limited | Wholesale & retail | 2025 |
| C&C Electrical Ltd | Construction | 2025 |
| C&C Hair and Beauty Club Ltd | Other services | 2022 |
| C&C Properties to Buy Ltd | Real estate | 2013 |
| C&C Strategic Quality Services Ltd | Professional & scientific | 2026 |
| C&C Tanning and Cosmetics Ltd | Other services | 2026 |
| C&C Trans Ltd | Transport & logistics | 2019 |
| C&D Plastering Contractors Limited | Construction | 2022 |
| C&Dtraining Limited | Professional & scientific | 2010 |
| C&G Transport Logistics Limited | Transport & logistics | 2024 |
| C&K Projects Ltd | Financial services | 2025 |
| C&L Trans Ltd | Transport & logistics | 2015 |
| C&O Cleaning Services Ltd | Other services | 2022 |
| C&O Start-Up Ltd | Construction | 2021 |
| C&S Healthcare Limited | Health & social care | 2025 |
| C&T Transport (NW) Limited | Transport & logistics | 2020 |
| C&Wh Butt Limited | Financial services | 2023 |
| C. Cerce Ltd | Transport & logistics | 2014 |
| C. Christo & Co. Limited | Real estate | 1993 |
| C. L. a. S Trans Limited | Transport & logistics | 2022 |
| C.E.C (Cagehin Electrical Contractors) Limited | Construction | 2013 |
| C.H. Composites Ltd | Manufacturing | 2019 |
| C.I.A.&Sons Home Improvements Ltd | Construction | 2022 |
| C.J.P.V Ltd | Transport & logistics | 2026 |
| C.R. Garden Maintenance and Clearance Ltd | Administrative & support | 2026 |
| C.R. Properties Limited | Construction | 2000 |
| C.R.E.Johnson Supplies Limited | Real estate | 1953 |
| C.Rouse & Co Ltd | Wholesale & retail | 2024 |
| C.S.W. Landscapes Ltd | Other services | 2003 |
| C.W.Promotions | | 1989 |
| C2LIFE Ltd | Information & communication | 2022 |
| C37 Limited | Other services | 2005 |
| C3C Limited | Wholesale & retail | 2024 |
| C3R Critical Care Crisis Response Ltd | Health & social care | 2025 |
| C4 Capital Limited | Financial services | 2024 |
| CA Buildings Ltd | Construction | 2018 |
| Caab Transport Ltd | Transport & logistics | 2018 |
| Caam Limited | Transport & logistics | 2018 |
| Caans Consultancy Ltd | Professional & scientific | 2016 |
| Cabaero Aviation Ltd | Education | 2022 |
| Cabal Holdings Limited | Other services | 2021 |
| Cabar Limited | Hospitality | 2016 |
| Cabello Silk Wear Ltd | Wholesale & retail | 2020 |
| Cabiri Limited | Information & communication | 2017 |
| Cable on Express Limited | Wholesale & retail | 2014 |
| Cactus Green Consulting Limited | Professional & scientific | 2019 |
| CAD Data Limited | Information & communication | 1996 |
| Cadere Ltd | Transport & logistics | 2020 |
| Cadman Capital Investments (Aquaculture) Limited | Other services | 2023 |
| Cadman Capital Investments (Beverages) Limited | Other services | 2023 |
| Cadman Capital Investments (Corporate) Limited | Other services | 2023 |
| Cadman Capital Investments (Lifestyle) Limited | Other services | 2023 |
| Cadman Capital Investments (Packaging) Limited | Manufacturing | 2023 |
| Cadman Capital Investments (Property) Limited | Other services | 2023 |
| Cadman Capital Services Limited | Professional & scientific | 2012 |
| Cadman Commercial Services Limited | Wholesale & retail | 2010 |
| Cadman Corporate Services Ltd | Administrative & support | 2019 |
| Cadman Fine Wines Limited | Wholesale & retail | 2001 |
| Cadman Real Estate Limited | Real estate | 2020 |
| Cadman Sporting Limited | Arts & recreation | 2017 |
| Cadore & Mayes Property Management Services Limited | Real estate | 2015 |
| Caemora Ltd | Wholesale & retail | 2023 |
| Caesars Court (Towcester) Management Company Limited | Households | 2006 |
| CAF Advisory Limited | Professional & scientific | 2017 |
| CAF Globalconsulting Limited | Administrative & support | 2018 |
| Cafe AU Lait Limited | Hospitality | 2026 |
| Cafe CNC Ltd | Hospitality | 2025 |
| Cafe Creations CIC | Hospitality | 2016 |
| Cafe Ines Ltd | Hospitality | 2024 |
| Cafe Marseille Ltd | Hospitality | 2018 |
| Cafe MAX Limited | Hospitality | 2025 |
| Cafe Movera Ltd | Hospitality | 2025 |
| Cafe Mysuru Limited | Hospitality | 2024 |
| Cafe Solo (Gloucester) Ltd | Extraterritorial | 2023 |
| Cafe Times Ltd | Hospitality | 2026 |
| Cafemonde Limited | Hospitality | 2023 |
| Caffe D'Italia Northampton Limited | Hospitality | 2010 |
| Caffebellavita Ltd | Hospitality | 2025 |
| CAH Heritage Limited | Real estate | 2015 |
| Caherconree Limited | Information & communication | 2014 |
| Caim Consulting Ltd | Education | 2023 |
| Cairn and Coast Escapes Limited | Hospitality | 2026 |
| Cairniny Services Ltd | Professional & scientific | 2019 |
| Cairo Developments Ltd | Real estate | 2024 |
| Cake & Co London Limited | Hospitality | 2023 |
| Cake Decore Limited | Manufacturing | 2015 |
| Cala Sona Management Limited | Administrative & support | 2019 |
| Calabria Coffee Ltd | Hospitality | 2022 |
| Calcutt Farm Ltd | Agriculture & fishing | 2019 |
| Caldwell Metalwork Fabrication Ltd | Manufacturing | 2007 |
| Caldwell Precision Assembly Ltd | Professional & scientific | 2024 |
| Caleb Locke Group Ltd | Professional & scientific | 2026 |
| Caleb Slater Trading Limited | Financial services | 2025 |