| Clouddynamix Limited | Administrative & support | 2014 |
| Cloudenable Ltd | Information & communication | 2022 |
| Cloudgirlsdigital Ltd | Information & communication | 2025 |
| Cloudhaus Limited | Information & communication | 2013 |
| Cloudification Limited | Information & communication | 2019 |
| Cloudmentis Ltd | Information & communication | 2025 |
| Cloudstix.Com Ltd | Wholesale & retail | 2013 |
| Cloudwyse Ltd | Information & communication | 2018 |
| Clough Co Investments Limited | Real estate | 2024 |
| Clough Corporate Solutions Limited | Professional & scientific | 2022 |
| Cloverco Limited | Real estate | 2022 |
| Cloverleaf Mortgages Limited | Financial services | 2004 |
| Cloverleafworld Limited | Education | 2013 |
| Clovernet Investments Ltd | Financial services | 2022 |
| Clovernet Ltd | Information & communication | 2013 |
| Clpp Limited | Real estate | 2019 |
| CLR Global Enterprises Limited | Wholesale & retail | 2026 |
| CLT EOT Limited | Extraterritorial | 2026 |
| Club Cars Limited | Transport & logistics | 2017 |
| Club Crowd Ventures Ltd | Information & communication | 2024 |
| Club CUP Limited | Financial services | 2025 |
| Club Ekta CIC | Arts & recreation | 2022 |
| Club Esports Limited | Arts & recreation | 2025 |
| Club Insure Limited | Financial services | 1998 |
| Club It.Co.Uk Limited | Wholesale & retail | 1999 |
| Club MOO Ltd | Education | 2025 |
| Club Picker Ltd | Information & communication | 2025 |
| Club Retail Limited | Administrative & support | 2005 |
| Clubbera Ltd | Information & communication | 2024 |
| Clubit Live Limited | Information & communication | 2024 |
| Clubit New Media Limited | Information & communication | 2014 |
| Clubnorth Limited | Arts & recreation | 2020 |
| Clubnorth NH Limited | Arts & recreation | 2023 |
| Clubnorth QP Limited | Arts & recreation | 2020 |
| Cluck Limited | Professional & scientific | 2010 |
| Clue Records Limited | Information & communication | 2013 |
| Clugston Construction Limited | Construction | 1961 |
| Clugston Group Limited | Professional & scientific | 1937 |
| Clugston Reclamation Limited | Professional & scientific | 1964 |
| Clumpcliffe Farm (Management) Limited | Administrative & support | 1999 |
| Clumpcliffe Hunting Lodge Ltd | Construction | 2021 |
| Clunie & Co. Ltd | Construction | 2021 |
| CLW Investments Limited | Real estate | 2018 |
| Clyde Daniel Marcus Walker Limited | Extraterritorial | 2025 |
| Clyde Walker Limited | Extraterritorial | 2025 |
| Clynes Medical Limited | Health & social care | 2021 |
| CM Business & Marketing Services Ltd | Administrative & support | 2009 |
| CM Commissioning Limited | Professional & scientific | 2018 |
| CM Couriers (UK) Limited | Transport & logistics | 2013 |
| CM Global Talent Limited | Administrative & support | 2022 |
| CM Green 1981 Limited | Financial services | 2019 |
| CM Hair Ltd | Other services | 2018 |
| CM Luxury Cars Global Ltd | Wholesale & retail | 2021 |
| CM Media Ltd | Professional & scientific | 2025 |
| CM Office Recruitment Ltd | Administrative & support | 2018 |
| CM Technology Ltd | Construction | 2020 |
| CM Tuning Limited | Wholesale & retail | 2017 |
| CMA Collaborative UK Limited | Health & social care | 2020 |
| CMA Financial Services Ltd | Professional & scientific | 2011 |
| CMA Heating Services Limited | Construction | 2025 |
| CMA Surveyors (Yorkshire) Limited | Professional & scientific | 2009 |
| Cmac Logistics Ltd | Transport & logistics | 2013 |
| CMB UK Property Limited | Real estate | 2014 |
| CMC (Ihomes) Ltd | Real estate | 2016 |
| CMC Construction (Yorkshire) Limited | Construction | 2008 |
| CMC Socials Ltd | Professional & scientific | 2024 |
| CMC Wealth Ltd | Financial services | 2018 |
| Cmdlinezero Ltd | Information & communication | 2025 |
| CME 2018 Ltd | Real estate | 2018 |
| CMG Global Services Limited | Administrative & support | 2024 |
| CMH Employee Relations and Consultancy Services Ltd | Administrative & support | 2015 |
| Cmhm Limited | Real estate | 2021 |
| CMI (Yorkshire) Limited | Real estate | 2020 |
| Cmid Properties LLP | | 2009 |
| Cmjc Ltd | Real estate | 2026 |
| CMK Property Solutions Ltd | Real estate | 2019 |
| Cmkm Limited | Arts & recreation | 2024 |
| CML Group Limited | Financial services | 2017 |
| CML Infrastructure Limited | Financial services | 2026 |
| CML Ltd | Construction | 2025 |
| CML SPV1 Limited | Extraterritorial | 2026 |
| Cmlr Horizons Limited | Administrative & support | 2019 |
| CMM EOT Limited | Extraterritorial | 2024 |
| Cmowellbeing CIC | Health & social care | 2025 |
| Cmpaas Ltd | Professional & scientific | 2019 |
| CMR Bulk Haulage Ltd | Transport & logistics | 2021 |
| CMR Timber Limited | Wholesale & retail | 2022 |
| Cmrc Limited | Extraterritorial | 2011 |
| Cmtk Properties Ltd | Real estate | 2020 |
| Cmtmediamanagement Ltd | Manufacturing | 2024 |
| CMW Carpentry & Joinery Ltd | Construction | 2015 |
| CMW Tech Limited | Wholesale & retail | 2023 |
| CMWSW4U Ltd | Health & social care | 2024 |
| Cmxsc Ltd | Health & social care | 2013 |
| CMY Investment Limited | Financial services | 2018 |
| Cmzm Ltd | Wholesale & retail | 2026 |
| CN Estimating Ltd | Professional & scientific | 2011 |
| CNC Services NE Ltd | Manufacturing | 2021 |
| CNC4UUK Ltd | Manufacturing | 2024 |
| CNJ Caterers Ltd | Hospitality | 2022 |