| Citywalk Residents Company Limited | Chelsea | 1988 |
| Citywell Limited | Cardiff | 2022 |
| Citywood Homes Ltd | London | 2022 |
| Cityzone Residents Management Limited | Broadstairs | 1986 |
| Civic Chambers Management Ltd | London | 2026 |
| Civic Homes Ltd | Dagenham | 2020 |
| Civic Oakview Ltd | St. Albans | 2024 |
| Civicpoint Ltd | London | 2025 |
| CIW Heat Management Company Limited | London | 2022 |
| CJ Letting Agents Ltd | Tilbury | 2026 |
| CJ Premises Ltd | Gateshead | 2025 |
| CJ Properties (Neath) Limited | Neath | 2022 |
| CJ Property & Lettings Ltd | Hull | 2024 |
| CJ Property Management & Development Ltd | Harpenden | 2019 |
| Cjaw Limited | Keighley | 2023 |
| CJB Property Investment Limited | Cambridge | 2018 |
| CJB Theo Limited Ltd | Tredegar | 2020 |
| CJF Logistics Ltd | Doncaster | 2024 |
| CJH Freehold Ltd | Brentwood | 2024 |
| CJH Immobilien Verwaltung Limited | York | 2023 |
| CJH Property Maintenance Ltd | Birmingham | 2021 |
| CJI Properties (Pontarddulais) Limited | Swansea | 2014 |
| CJL Maintenance Ltd | Orpington | 2026 |
| CJN Properties Limited | Wimborne | 1997 |
| CJO and Seo-Midas Services Ltd | Bedford | 2024 |
| Cjsi Limited | Wilmslow | 2016 |
| CJV12 Ltd | London | 2025 |
| CK Property Group Ltd | Stockton-On-Tees | 2024 |
| CKD Estates Ltd | Sawbridgeworth | 2025 |
| CKD Management Limited | Edgware | 2025 |
| CKG Property Group Ltd | London | 2024 |
| CKH Saunders Ltd | Chichester | 2025 |
| CKP Management Co Limited | Whitley Bay | 2022 |
| Ckrn Limited | Manchester | 2026 |
| CKT (NI) Ltd | Bangor | 2025 |
| CKW Property Services Ltd | Saltash | 2023 |
| CKW Residents' Management Company Ltd | Seaton | 2020 |
| CL Futures Ltd | Nottingham | 2025 |
| CL Investment Group Ltd | Leeds | 2019 |
| CL9UD Ltd | Westcliff On Sea | 2019 |
| Clad Line Limited | Nottingham | 2015 |
| Cladagh Properties Ltd | Birmingham | 2025 |
| Cladd Limited | London | 1999 |
| Clahane Drive Management Company Limited | Horbury | 2021 |
| Claim Farm Management Company Limited | Frodsham | 1994 |
| Claimadvance Property Management Limited | Kingston Upon Thames | 1987 |
| Claimlink Property Management Limited | Ashford | 1987 |
| Claimsite Property Management Limited | Bicester | 1987 |
| Claimterm Property Management Limited | Taunton | 1987 |
| Claines Villa Limited | Wolverhampton | 1979 |
| Clair DE Lune Management Limited | Derby | 2021 |
| Clair Lodge (Management) Limited | Bournemouth | 2006 |
| Claire Court (Cheshunt) Limited | Harlow | 1984 |
| Claire Court (Highcliffe) Limited | New Milton | 1985 |
| Claire Court (Torquay) Management Company Limited | Torquay | 1988 |
| Claire Court (Walton-On-Thames) Management Company Limited | New Milton | 1977 |
| Claire Court Limited | London | 2013 |
| Claire Court Management (Birchington) Limited | Birchington | 1983 |
| Claire Court Management (Leeds) Limited | Leeds | 1989 |
| Claire Court Management (West Mersea) Limited | Colchester | 1990 |
| Claire Court Management Sutton Limited | Epsom | 2001 |
| Claire Court Residents Association (Sheldon) Limited | Solihull | 1973 |
| Claire Homes Limited | Coventry | 2026 |
| Claireville Management Company Limited | Kettering | 2001 |
| Clairvaux Gardens Management Limited | Solihull | 2008 |
| Clairville Court Management Co.Limited | Dorking | 1971 |
| Clairville Grange Management Company Limited | Derby | 2015 |
| Clairville Residents' Association Limited | Southport | 1975 |
| Clam (Christmas Lane and Meadowcroft) Ltd | Windermere | 2017 |
| Clam Limited | London | 2013 |
| Clamar Management Company Limited | Littlehampton | 1989 |
| Clamberoak Limited | Newbury | 1989 |
| Clamley Court Management Company Limited | | 1991 |
| Clan House (Sevenoaks) Residents Limited | Sevenoaks | 1977 |
| Clanaboggan Property Management Limited | Omagh | 2006 |
| Clanaboy Lane Management Company Ltd | Belfast | 2025 |
| Clanbrassil (Tollymore) Management Limited | Newry | 2019 |
| Clandeboye Court Management Limited | Belfast | 2026 |
| Clandon Court (Sutton) Management Limited | Redhill | 2004 |
| Clandon Court Management Company Limited | Morecambe | 1988 |
| Clanna Rury Residents Limited | Co Londonderry | 2005 |
| Clanricarde Gardens Ltd | Tunbridge Wells | 2019 |
| Clanrye House Property Management Ltd | Newry | 2022 |
| Clanville Grange Management Company Limited | Shrewsbury | 2007 |
| Clanville Residents Company Limited | Taunton | 1970 |
| Clanville Rise (Flats) Residents Association Limited | Arundel | 2012 |
| Clapham Central Freeholders Ltd | Hertford | 2021 |
| Clapham Court Terrace Residents Association Limited | Greenwich | 2007 |
| Clapham High Street Ltd | London | 2022 |
| Clapham Leasing Limited | London | 2016 |
| Clapham Mansions Freehold Limited | Ruislip | 2004 |
| Clapham North Side (Residents) Limited | London | 1977 |
| Clapham Park Mews Ltd | London | 2013 |
| Clapham Properties Limited | London | 1999 |
| Clappentail Estates Company Limited | Sidmouth | 1983 |
| Clapton 5360 Ltd | London | 2021 |
| Clapton ROW Management Company Limited | Pershore | 2007 |
| Clapton Square Mansions Management Limited | London | 1999 |
| Clara's Cleaning Services Ltd | | 2008 |
| Clare Court (Milton) RTO Company Limited | Cambridge | 2026 |