| Cosy Corner Childminding Ltd | Health & social care | 2025 |
| Cosy Home Diaries Ltd | Information & communication | 2026 |
| Cosy Retreat Stays Limited | Hospitality | 2024 |
| Cosynestle Lodgings Ltd | Hospitality | 2025 |
| Cote Hillock Ltd | Transport & logistics | 2022 |
| Cote House Catering Limited | Hospitality | 2024 |
| Cotic Limited | Wholesale & retail | 2000 |
| Cotswold Shire Pubs LLP | | 2025 |
| Cottages for ALL Seasons Limited | Real estate | 2015 |
| Cottam 1966 Limited | Extraterritorial | 2013 |
| Cotton Arcade Ltd | Wholesale & retail | 2022 |
| Cotton Mill Aparts Management Ltd | Extraterritorial | 2022 |
| Coughlan Electrical Limited | Construction | 2020 |
| Coughlan Property Investments Limited | Real estate | 2025 |
| Coulomb Ltd | Professional & scientific | 2012 |
| Coulson Residential Limited | Administrative & support | 2015 |
| Coulthard Group Ltd | Education | 2024 |
| Coumes Spring Children's Centre Ltd | Education | 2021 |
| Counter Punch Academy Ltd | Education | 2025 |
| Countermark Design Ltd | Professional & scientific | 2024 |
| Countryside Conversions Limited | Construction | 2005 |
| Countrywide in Norfolk Ltd | Other services | 2006 |
| County Builders Ltd | Construction | 2014 |
| County Shopfitting Services Limited | Manufacturing | 1992 |
| Couples Home Share Ltd | Information & communication | 2023 |
| Courier 4U Ltd | Transport & logistics | 2024 |
| Courier Logistics Limited | Transport & logistics | 1994 |
| Cousins Barber Ltd | Other services | 2018 |
| Couture Again Ltd | Other services | 2017 |
| Couture Authentication Ltd | Other services | 2017 |
| COV Broadcast Services Limited | Information & communication | 2015 |
| Covanent Healthcare Limited | Health & social care | 2014 |
| Coventry Blaze Ltd | Arts & recreation | 2001 |
| Cover N Style Ltd | Wholesale & retail | 2020 |
| Coverpress Limited | Other services | 1991 |
| Coversia Ltd | Wholesale & retail | 2025 |
| Covrad Heat Transfer International Ltd | Professional & scientific | 2023 |
| COW Boys Burgers Ltd | Hospitality | 2025 |
| Cowley Court (Chapeltown) Management Limited | Households | 2000 |
| Cowley Lane Developments Limited | Construction | 2007 |
| Cowmouth Farm Estate Management Company Limited | Households | 2017 |
| COX Borg Consulting Engineers Limited | Professional & scientific | 2020 |
| Coyle Couriers Haulage Ltd | Transport & logistics | 2012 |
| Cozy Beans Ltd | Hospitality | 2024 |
| Cozy Cleaning Solution Ltd | Administrative & support | 2024 |
| Cozy Stoves (Yorkshire) Limited | Construction | 2022 |
| Cozycoove Limited | Wholesale & retail | 2025 |
| CP Commercial Property Management Ltd | Real estate | 2025 |
| CP Tank Installations Limited | Construction | 2019 |
| CPC Healthcare Ltd | Administrative & support | 2015 |
| CPC1 Developments Limited | Construction | 2018 |
| CPC1 Holdings Limited | Financial services | 2018 |
| CPD Beauty Limited | Education | 2026 |
| CPD Distribution PLC | Extraterritorial | 1981 |
| CPD Lettings Limited | Real estate | 2025 |
| Cpdbee Limited | Professional & scientific | 2026 |
| Cpdplus Limited | Education | 2023 |
| CPE Services Ltd | Professional & scientific | 2017 |
| CPG (MID Kent) Limited | Construction | 2019 |
| Cpgt Catering Limited | Hospitality | 2025 |
| CPI Solutions Limited | Professional & scientific | 2017 |
| CPL Activated Carbons Limited | Wholesale & retail | 2022 |
| CPL Enterprises Ltd | Hospitality | 2014 |
| CPL Environmental Americas Limited | Extraterritorial | 1993 |
| CPL Environmental Limited | Extraterritorial | 1990 |
| CPL France Limited | Water & waste | 2007 |
| CPL Hargreaves Limited | Extraterritorial | 1929 |
| CPL Industrial Services (Holdings) Limited | Extraterritorial | 1997 |
| CPL Industries (Emea) Limited | Professional & scientific | 2007 |
| CPL Industries Latvia Limited | Wholesale & retail | 1957 |
| CPL Industries Pension Trustees Limited | Professional & scientific | 1995 |
| CPL Logistics Limited | Extraterritorial | 1965 |
| CPL Oldco (NO 3) Limited | Financial services | 2022 |
| CPL Oldco NO. 4 Limited | Manufacturing | 2022 |
| CPL Pension Trustees (Distribution) Limited | Professional & scientific | 1995 |
| CPL Pension Trustees Limited | Professional & scientific | 1995 |
| CPL Products Limited | Manufacturing | 1973 |
| CPL Property Limited | Extraterritorial | 1995 |
| CPL South Africa Limited | Financial services | 2018 |
| CPL Trading Limited | Wholesale & retail | 1994 |
| CPL Trustees Limited | Extraterritorial | 1995 |
| Cpld Limited | Professional & scientific | 1960 |
| Cplg Limited | Financial services | 2022 |
| Cplgpopup Ltd | Wholesale & retail | 2023 |
| CPM Installations Ltd | Construction | 2016 |
| CPP Agency LLP | | 2013 |
| CPP FM & Projects Ltd | Construction | 2015 |
| CPR Property Management Limited | Real estate | 2010 |
| CPS Properties Leeds Limited | Households | 2017 |
| Cpubs & Hospitality Ltd | Hospitality | 2025 |
| CPW Joinery Ltd | Manufacturing | 2025 |
| CQ Marketing Academy Limited | Administrative & support | 2016 |
| CQR Security Limited | Manufacturing | 2004 |
| Cq’S Pizza Limited | Hospitality | 2025 |
| CR Asbestos Surveying Ltd | Professional & scientific | 2012 |
| CR Drains & Water Mains Limited | Construction | 2025 |
| CR Networks Ltd | Administrative & support | 2017 |
| CR Property Maintenance Services Ltd | Construction | 2025 |
| CR Services (UK) Ltd | Arts & recreation | 2014 |
| CR Trials Ltd. | Health & social care | 2003 |