| C&A Vehicle Repairs Limited | Wholesale & retail | 2026 |
| C&C Renovations & Lettings Ltd | Real estate | 2025 |
| C&D Family Care Ltd | Health & social care | 2019 |
| C&D Family Property Ltd | Real estate | 2024 |
| C&Ec Investments Limited | Real estate | 2026 |
| C&G Project Management Ltd | Other services | 2019 |
| C&H Real Estate Limited | Real estate | 2019 |
| C&J Strange Property Limited | Real estate | 2023 |
| C&R Construction Services Limited | Professional & scientific | 2025 |
| C&S Homes Hurst Hall Limited | Construction | 2020 |
| C&S Medical Services Ltd | Professional & scientific | 2024 |
| C&T Developments Ltd | Construction | 2024 |
| C-Cell Limited | Manufacturing | 2003 |
| C-Future (Systems Engineering Notions) Limited | Administrative & support | 2007 |
| C-Padel Limited | Manufacturing | 2026 |
| C. Krohn-Lima Aestimationes Limited | Administrative & support | 2024 |
| C.A.S. Products Limited | Construction | 1992 |
| C.C.J Property Limited | Real estate | 2023 |
| C.Co Peptides Ltd | Wholesale & retail | 2026 |
| C.Dawes Civils Limited | Construction | 2024 |
| C.J.K. Solutions Limited | Administrative & support | 2013 |
| C.M.R. Distribution Limited | Real estate | 1985 |
| C.Price Garden Design and Maintenance Ltd | Administrative & support | 2024 |
| C.R Content Creation Limited | Information & communication | 2024 |
| C.W.G. Classic Engine Builders Ltd | Professional & scientific | 2025 |
| C.Wroe Pestcontrol Limited | Administrative & support | 2024 |
| C00LIO Divine Limited | Health & social care | 2016 |
| C2G Ltd | Information & communication | 2007 |
| C3D Solutions Ltd. | Administrative & support | 2013 |
| C4 Consulting Limited | Professional & scientific | 2018 |
| C4 Holdings Limited | Financial services | 2017 |
| C4 Land Limited | Financial services | 2018 |
| C4 Projects Limited | Professional & scientific | 2011 |
| C48 Consulting Limited | Administrative & support | 2017 |
| C5ISR Limited | Administrative & support | 2016 |
| CA CAD Design Limited | Administrative & support | 2010 |
| CA Capital Limited | Professional & scientific | 2017 |
| CA General Solutions Ltd | Construction | 2025 |
| Ca&Hw Property Ltd | Real estate | 2026 |
| Caare Ltd | Construction | 2025 |
| Cabinology Ltd | Hospitality | 2021 |
| Cable Jointers Ltd | Extraterritorial | 2024 |
| Cable Pro Design Ltd | Professional & scientific | 2021 |
| Cablejog Limited | Manufacturing | 2003 |
| Cablemate Limited | Professional & scientific | 2013 |
| Cabot Theydon Limited | Administrative & support | 2013 |
| Cabourn Statistics Limited | Other services | 2019 |
| Cactora Ltd | Professional & scientific | 2022 |
| Cactus Clothing Company Ltd. | Wholesale & retail | 2005 |
| CAD Bathrooms Ltd | Construction | 2024 |
| CAD Financial Consultants Ltd | Professional & scientific | 2025 |
| CAD Plan Design Limited | Administrative & support | 2007 |
| CAD3 Solutions Limited | Administrative & support | 2015 |
| Caddagat Limited | Other services | 2017 |
| Caddick Engineering Ltd | Professional & scientific | 2015 |
| Caddick Limited | Real estate | 2000 |
| Cade Care Limited | Health & social care | 2019 |
| Cadence CX Limited | Professional & scientific | 2018 |
| Cadence Industrial Partnerships Ltd | Administrative & support | 2023 |
| Cadence Media Solutions Ltd | Professional & scientific | 2025 |
| Caderias Limited | Information & communication | 2017 |
| Cadman Design Services Ltd | Administrative & support | 2023 |
| Cadnix Consulting Ltd | Professional & scientific | 2015 |
| Cadre Components Limited | Manufacturing | 1994 |
| Cadsupp Limited | Other services | 2007 |
| Cadzow Project Management Ltd | Administrative & support | 2025 |
| Caeran Financial Limited | Hospitality | 2009 |
| Cafe Alma Limited | Hospitality | 2025 |
| Cafe at the END of the Universe Limited | Hospitality | 2026 |
| Cafe Ocho Limited | Hospitality | 2015 |
| Caffe Italianoo Limited | Hospitality | 2026 |
| CAG Legal Consultancy Limited | Professional & scientific | 2018 |
| Caginic Limited | Information & communication | 2016 |
| Cairn Chemistry Limited | Administrative & support | 2026 |
| Cairn Project Consulting Ltd | Professional & scientific | 2015 |
| Cairngorm Commercial Services Limited | Administrative & support | 2024 |
| Cairntech Limited | Professional & scientific | 2017 |
| Cairo Leisure Ltd | Other services | 2019 |
| Cairo Property Group Ltd | Real estate | 2019 |
| Cakes by Rhys Ltd | Manufacturing | 2018 |
| CAL E-Commerce Limited | Wholesale & retail | 2025 |
| CAL Joinery Limited | Construction | 2018 |
| CAL Sameday Limited | Transport & logistics | 2011 |
| CAL South Limited | Transport & logistics | 2023 |
| CAL Surveying Services Limited | Administrative & support | 2012 |
| Cala Events Ltd | Hospitality | 2024 |
| Calcaria Consulting Ltd | Professional & scientific | 2019 |
| Calculate IT Solutions Limited | Information & communication | 2010 |
| Caldelec Electrical Contractors Ltd | Construction | 2024 |
| Calder Training & Consultancy Limited | Education | 2010 |
| Caldicott & Killen Ltd | Real estate | 2023 |
| Caldwell Visuals Limited | Information & communication | 2023 |
| Calgary Limited | Administrative & support | 2009 |
| Calibration & Detection Gases Ltd | Extraterritorial | 2016 |
| Calibration GAS & Equipment Ltd | Extraterritorial | 2016 |
| Calibre Control International Limited | Manufacturing | 1989 |
| Call in SAY HI Ltd | Financial services | 2025 |
| Callan Property Group Limited | Real estate | 2024 |
| Callands Consultancy Limited | Financial services | 2015 |
| Callands Fryer Ltd | Hospitality | 2019 |