| Cross Bay Caravans Transport Limited | Transport & logistics | 2026 |
| Cross Country Caravan & Motorhomes Ltd | Wholesale & retail | 2025 |
| Cross Hire Holdings Limited | Administrative & support | 2023 |
| Cross Plant Hire Limited | Administrative & support | 2014 |
| Cross Plant Holdings Limited | Administrative & support | 2021 |
| Crovix Limited | Administrative & support | 2025 |
| Crown Barbers Burry Ltd | Other services | 2025 |
| Crown Energy Holdings Limited | Financial services | 2022 |
| Crown Energy Limited | Construction | 1993 |
| Crown GAS & Power (Siteworks) Limited | Construction | 2015 |
| Crown GAS and Power (Holdings) Limited | Energy | 2016 |
| Crown GAS and Power (Metering) Ltd | Administrative & support | 2026 |
| Crown GAS and Power 2 Limited | Energy | 2018 |
| Crown GAS and Power 3 Limited | Information & communication | 2025 |
| Crown GAS and Power Limited | Energy | 2012 |
| Crown Natural Capital Limited | Financial services | 2025 |
| Crown OIL (Environmental) Limited | Wholesale & retail | 2012 |
| Crown OIL Estates Limited | Real estate | 2023 |
| Crown OIL Holdings Limited | Financial services | 2022 |
| Crown OIL House LLP | | 2005 |
| Crown OIL Investments Limited | Real estate | 2014 |
| Crown OIL Property Holdings Limited | Financial services | 2022 |
| Crown OIL Property Ltd | Real estate | 2017 |
| Crown OIL Treasury Ltd | Professional & scientific | 2017 |
| Crown OIL UK Ltd | Professional & scientific | 2006 |
| Crown OIL UK Services Limited | Professional & scientific | 2001 |
| Crown Performance Additives Ltd | Wholesale & retail | 2015 |
| Crown Response Limited | Extraterritorial | 2022 |
| Crown Smart Metering Limited | Administrative & support | 2026 |
| Crown Telecom Solutions Limited | Professional & scientific | 2010 |
| Crown Utilities Limited | Construction | 2009 |
| Crux Studio London Ltd | Professional & scientific | 2021 |
| Crydon Limited | Extraterritorial | 2021 |
| Crystal Carols Limited | Wholesale & retail | 2004 |
| CS Crooks Property Management Ltd | Real estate | 2019 |
| Cs.Csuk Ltd | Administrative & support | 2017 |
| CSC Company Service | Information & communication | 2014 |
| CSC Credit Service Ltd | Other services | 2014 |
| CSC Credit&Saving Company | Financial services | 2014 |
| CSD Housing Limited | Real estate | 2025 |
| CSO Ltd | Administrative & support | 2008 |
| Cstec Limited | Professional & scientific | 2003 |
| CSY Consultancy Ltd | Information & communication | 2021 |
| CT Accounting Solutions Limited | Professional & scientific | 2019 |
| Ctatax.Uk Ltd | Information & communication | 2019 |
| CTD Businesss Partners Limited | Professional & scientific | 2016 |
| Ctrlplusz Ltd | Wholesale & retail | 2024 |
| CTS Detail Ltd | Other services | 2023 |
| CTV Manchester Limited | Information & communication | 2008 |
| Cube Desserts Bury Ltd | Hospitality | 2021 |
| Cube Umbrella Limited | Administrative & support | 2021 |
| Cudis Limited | Wholesale & retail | 2004 |
| Cudos Systems Holdings Limited | Financial services | 2020 |
| Cudos Systems Limited | Information & communication | 2015 |
| Cunago Limited | Construction | 2023 |
| Cundall Estates Ltd | Real estate | 2024 |
| Cunningham P M Limited | Wholesale & retail | 2024 |
| Cuppaccino Heald Green Limited | Hospitality | 2014 |
| Cuppaccino Littleborough Limited | Hospitality | 2017 |
| Cuppaccino Padgate Ltd | Health & social care | 2026 |
| Cura Accounting Ltd | Professional & scientific | 2010 |
| Curated Makers Ltd | Construction | 2020 |
| Curley's Dining Room Limited | Hospitality | 2012 |
| Curley's Fisheries Limited | Agriculture & fishing | 2003 |
| Curly Baker Ltd | Manufacturing | 2026 |
| Curvature Limited | Professional & scientific | 2004 |
| Custom Boxing Rings Limited | Wholesale & retail | 2025 |
| Custom Magnets UK Ltd | Manufacturing | 2025 |
| Customer Care Construction Company Limited | Construction | 2019 |
| Customisedcreative Limited | Extraterritorial | 2011 |
| Customs Declaration Services Ltd | Transport & logistics | 2019 |
| CVC Credit Corps Ltd | Professional & scientific | 2014 |
| CVF Bury Limited | Wholesale & retail | 2017 |
| CW Group Ltd | Financial services | 2025 |
| Cybershield Group Ltd | Wholesale & retail | 2026 |
| Cyborgclothing Ltd | Wholesale & retail | 2019 |
| Cycarts Ltd | Information & communication | 2024 |
| Cynexa Ltd | Administrative & support | 2023 |
| D & J Machinery Limited | Administrative & support | 1998 |
| D & J Property Management Ltd | Real estate | 2020 |
| D & L Consultancy Services Ltd | Health & social care | 2018 |
| D & M Wilsher Ltd | Hospitality | 2024 |
| D and B Street Ltd | Administrative & support | 2005 |
| D and E Motors Limited | Wholesale & retail | 2014 |
| D FOX Optical Limited | Health & social care | 2016 |
| D Marsh Business Support Services Ltd | Professional & scientific | 2015 |
| D N F Roofing & Cladding Ltd | Construction | 2009 |
| D P Grounds Maintenance Ltd | Administrative & support | 2017 |
| D Plus Limited | Administrative & support | 2017 |
| D R Drill Design Limited | Professional & scientific | 2021 |
| D R M Limited | Manufacturing | 2002 |
| D S P Food N.V Limited | Administrative & support | 2024 |
| D Wright Properties Ltd | Real estate | 2020 |
| D&A Compressor Services Limited | Financial services | 2024 |
| D&C Engineering Designs Ltd | Professional & scientific | 2023 |
| D&C Engineering Services Ltd | Manufacturing | 2020 |
| D&C Holdings Ltd | Financial services | 2023 |
| D&L Commercial Developments Ltd | Real estate | 2026 |
| D&L Commercial Properties Ltd | Real estate | 2026 |
| D&L Residential Developments Ltd | Real estate | 2026 |