| Cornwall Drive 1956 Limited | Bury | 2014 |
| Cornwall Electrical Wholesalers Limited | Knutsford | 1987 |
| Cornwall Fuels Limited | Newton Abbot | 2013 |
| Cornwall Garden Rooms Ltd | Epping | 2026 |
| Cornwall Geothermal Power Company Limited | Falmouth | 2008 |
| Cornwall Holiday Cottages Limited | Altrincham | 2003 |
| Cornwall Mining Consultants Limited | Camborne | 2022 |
| Cornwall Properties (Bedford) Ltd | Luton | 2004 |
| Cornwall Soapbox (Falmouth) Ltd | Falmouth | 2018 |
| Cornwall Soapbox (ST Ives) Ltd | Falmouth | 2021 |
| Coroman Ltd | London | 2017 |
| Corona Virus Claims Limited | Harrogate | 2020 |
| Corona Virus Compensation Limited | Harrogate | 2020 |
| Coronation 1959 Limited | Swadlincote | 2013 |
| Coronel Investment Ltd | Birmingham | 2014 |
| Coronet Group Limited | Glasgow | 2016 |
| Coronet Midco Limited | Glasgow | 2016 |
| Coronet Peak Time-Share Limited | Canvey Island | 1982 |
| Cororima Ltd | Leeds | 2026 |
| Corotec Limited | Nottingham | 2000 |
| Corporate & Chancery Group Limited | London | 2002 |
| Corporate & Chancery Nominees Limited | London | 2001 |
| Corporate Administration Limited | Stanmore | 2002 |
| Corporate and Consumer Finance UK Limited | Colchester | 2007 |
| Corporate Business Funding Ltd | Middlesex | 1993 |
| Corporate Cannibal Ltd | Dartford | 2020 |
| Corporate Cars North East Limited | Newcastle Upon Tyne | 2018 |
| Corporate Cleaning South-West Ltd | Radstock | 2020 |
| Corporate Colours Limited | Knaresborough | 1981 |
| Corporate Compliance Services Limited | Mildenhall | 2010 |
| Corporate Cottages Limited | Huddersfield | 2023 |
| Corporate Development Resources Limited | Towcester | 2017 |
| Corporate Events Limited | High Wycombe | 2003 |
| Corporate Festival Company Limited | Weybridge | 2023 |
| Corporate Finance Partners Limited | London | 2025 |
| Corporate Gypsie Consultancy PVT. Ltd | Glasgow | 2024 |
| Corporate Interactive Limited | London | 2011 |
| Corporate Lifelines Limited | London | 2002 |
| Corporate Liquidity Limited | Tenterden | 2004 |
| Corporate Medics (UK) Limited | Bolton | 2016 |
| Corporate Office Solutions Limited | Kirby In Ashfield | 1999 |
| Corporate Relating Limited | Enfield | 2017 |
| Corporate Secretaries Limited | London | 2014 |
| Corporate Secretary Subco 2 Limited | Camberley | 2025 |
| Corporate Securities Limited | St. Leonards-On-Sea | 1964 |
| Corporate Strategies PLC | Manchester | 1990 |
| Corporate Tax Planning Limited | Bridgnorth | 1988 |
| Corporate Telecommunications Limited | Manchester | 1995 |
| Corporate Venturing UK Limited | Saffron Walden | 2002 |
| Corporatec (London) Limited | Manchester | 2007 |
| Corporates in Consortium Ltd | London | 2024 |
| Corporation of Public Accountants Limited | Cardiff | 2011 |
| Corptime International Limited | London | 2011 |
| Corpxsglobal Ltd | Wimborne | 2017 |
| Corra Linn | Lanark | 2009 |
| Corralls Coal Limited | Sheffield | 1998 |
| Correctair Solutions (Ireland) Ltd | Craigavon | 2010 |
| Correctex Limited | London | 2017 |
| Correiomor Limited | London | 2022 |
| Correspondent Marine Limited | Harrow | 1982 |
| Corriemoillie Limited | Ross-Shire | 2006 |
| Corrigan Vintage Jewellery Ltd | Malmesbury | 2019 |
| Corrine Creates Ltd | Bromley | 2022 |
| Corringham Bull Public House Ltd | Leigh-On-Sea | 2024 |
| Corrocoat Services Limited | Leeds | 2002 |
| Corropages Limited | West Yorkshire | 2000 |
| Corroserve Limited | Leeds | 2015 |
| Corrosioneering Limited | Leeds | 2002 |
| Corrtelco Ltd | Chesterfield | 2023 |
| Corru-Tube Limited | Rainworth, Mansfield | 1992 |
| Corrugated Sheets & Cladding Limited | Smethwick | 1982 |
| Corrupt Clothing Ltd | Hounslow | 2021 |
| Corruption Control Limited | Herne Bay | 2011 |
| Corsair Event Solutions Ltd | Cardiff | 2017 |
| Corserv Contracting Limited | Redruth | 2023 |
| Corstat Containers Limited | Coventry | 1989 |
| Corstorphine & Wright New Co Limited | Warwick | 2018 |
| Cortachey Ltd | Portstewart | 2021 |
| Cortayne House (Ashford) Management Co. Ltd. | Ashford | 1989 |
| Cortec Construction and Property Maintenance Limited | Wirral | 2021 |
| Cortex Creatives Limited | London | 2018 |
| Cortexia Ltd | Llanelli | 2009 |
| Cortébert Limited | Brighton | 2022 |
| Corum Overseas Limited | London | 2024 |
| Corvantis for International Trading Limited | Manchester | 2026 |
| Corvus (UK) Ltd | Bristol | 2023 |
| Corvus Detection Dogs Limited | Bangor | 2020 |
| Cory Menorca Limited | Cheadle | 2004 |
| Corzo Marine Ltd | London | 2024 |
| Cosal Limited | Reading | 2021 |
| Cosalt Caravans Limited | Grimsby | 1941 |
| Cosalt Lighting Limited | Leeds | 1998 |
| Cosci Academia Ltd | Kington | 2024 |
| Coscima Ltd. | Henley | 2017 |
| Cosec 2000 Limited | London | 1995 |
| Cosec-On-Demand Limited | Ware | 2024 |
| Cosentia Ltd | London | 2013 |
| Cosfina Ltd | London | 2025 |
| Cosford Manufacturing Services Limited | Pinxton | 2013 |
| Cosgrove House Management Company Limited | Wembley | 2014 |