| C.M.B. Agroindustry Ltd | London | 2014 |
| C.M.B. Companies Ltd | London | 2014 |
| C.M.B. Energy Ltd | London | 2014 |
| C.M.B. Real Estate Ltd | London | 2014 |
| C.M.B. Solar Energy I Limited | London | 2020 |
| C.N.B. Investments Limited | Wetherby | 2020 |
| C.N.O Holdings Ltd | Darwen | 2022 |
| C.O.J Felix Capital Ltd | Glasgow | 2021 |
| C.P. (Arts) Holdings Limited | Exeter | 2012 |
| C.P. Goodall Ltd | Dorset | 2003 |
| C.P.Bennet.Limited | Leeds | 1932 |
| C.P.H. Limited | Chichester | 2003 |
| C.R. Engl Holdings Limited | Cardiff | 1978 |
| C.R. Toogood & Co. Limited | East Horsley, | 1957 |
| C.R. Underwriting Limited | London | 1998 |
| C.R.F.R.Consulting Limited | Cranbrook | 2021 |
| C.S Trading Solutions Ltd | Folkestone | 2025 |
| C.S. Allan | Coventry | 2025 |
| C.S. Buchanan Holdings Limited | Saxmundham | 2018 |
| C.S. Construction Holdings Limited | Lutterworth | 2017 |
| C.S. Funding Limited | Ampthill | 1993 |
| C.S.F Collective Ltd | Barnet | 2017 |
| C.S.H. Finance Limited | Birmingham | 1984 |
| C.S.I Manchester (Holdings) Limited | Crewe | 2014 |
| C.S.L. Asset Management Limited | Dunfermline | 2008 |
| C.S.T. Pharma Group Holdings Limited | Walsall | 2018 |
| C.Slorach Limited | Alton | 2015 |
| C.Splat Consulting Ltd | Tadley | 2010 |
| C.T. Business Solutions Ltd. | London | 1997 |
| C.T. Community (Holdings) Limited | Walsall | 2004 |
| C.T. Construction Holdings Limited | Chinley | 2021 |
| C.T. Team Fabrics Limited | Altrincham | 2023 |
| C.V.J. Properties Ltd | London | 2010 |
| C.W Davies Financial Consultancy Limited | Sheffield | 2022 |
| C.W. & J Cargill Holdings Limited | Saxmundham | 2024 |
| C.W. Froy & Sons Holdings Limited | London | 2025 |
| C.W. Jones Holdings Limited | Bristol | 2020 |
| C.W.Dixey & SON Limited | Cobham | 1930 |
| C.W.Russell (Holdings) Ltd | Richmond | 2020 |
| C.Wylie Trading Solutions Ltd | Glasgow | 2026 |
| C1 Capital Ltd | Camden | 2018 |
| C1 Equity Investments Limited | London | 2013 |
| C10 Investment Ltd | London | 2026 |
| C10 Propco Ltd | Crawley | 2026 |
| C100P Limited | Ipswich | 2024 |
| C11 Capital Ltd | Wembley | 2025 |
| C11153278 Ltd | London | 2018 |
| C13 Holdings Ltd | Nottingham | 2020 |
| C15 Solutions Limited | Manchester | 2022 |
| C17 Holdings Ltd | Southport | 2019 |
| C1E2L3 Holdings Ltd | Hebburn | 2025 |
| C2 Acquisitions Group Ltd | London | 2025 |
| C2 Mortgages Ltd | Liverpool | 2022 |
| C2 Technology Group Ltd | Newark | 2025 |
| C21 Creative Communications (EOT) Limited | Altrincham | 2021 |
| C22 Holdings Limited | Leeds | 2022 |
| C24 Capital Limited | London | 2023 |
| C247 Ltd | Newcastle Under Lyme | 2022 |
| C2C Nton Holdings Ltd | Kettering | 2025 |
| C2C Solutions UK Limited | Steyning | 2020 |
| C2C UK Warranty Limited | Crosby | 2016 |
| C2D Investment Co Ltd | London | 2022 |
| C2E Investment Group Ltd | Rushden | 2025 |
| C2G Holdings Ltd | Chichester | 2020 |
| C2G Wealth Management Ltd | Waltham Cross | 2019 |
| C2MT Limited | London | 2016 |
| C2S Holdco Ltd | Leicester | 2024 |
| C2Z Properties Limited | Ipswich | 2025 |
| C3 123 Limited | Cardiff | 2020 |
| C3 456 Limited | Cardiff | 2020 |
| C3 789 Limited | Cardiff | 2020 |
| C3 Capital Limited | Walsall | 2018 |
| C3 Construction Group Limited | Leicester | 2017 |
| C3 Construction Holdings Limited | Leicester | 2015 |
| C3 Group Holdings Limited | Manchester | 2026 |
| C3 INVEST1 Limited | Leeds | 2024 |
| C3 Investments in Ayrshire College Education Holdco Limited | Edinburgh | 2014 |
| C3 Investments Ltd | Tunbridge Wells | 2020 |
| C3 Language Holdings Ltd | Cambridge | 2026 |
| C3 Midlands Holdings Ltd | Birmingham | 2024 |
| C365 Limited | Sevenoaks | 2012 |
| C3E Solutions Limited | Sittingbourne | 2025 |
| C3I Investments Beau Nash House Ltd | Bath | 2023 |
| C3I Investments Ltd | Bath | 2021 |
| C3I Investments New Bond Street Ltd | London | 2025 |
| C4 Capital Limited | Northampton | 2024 |
| C4 Carbides Holdings Ltd. | Altrincham | 2021 |
| C4 Carriers Ltd | Exeter | 2002 |
| C4 Holdings Limited | Warrington | 2017 |
| C4 Land Limited | Warrington | 2018 |
| C4 UK Holdings Limited | London | 2023 |
| C442 Management Limited | London | 2025 |
| C45 Group Limited | Portsmouth | 2024 |
| C45CADE Ltd | Leeds | 2023 |
| C4F SPV1 Limited | Kington | 2026 |
| C4RYL Limited | Llanrhystud | 2011 |
| C4S Group Limited | Warwick | 2023 |
| C5 Capital Limited | London | 2009 |
| C6 Finance Ltd | Kings Hill | 2025 |
| C6 Holdings Ltd | Kings Hill | 2025 |