| Century Square (Halesowen) Management Company Limited | Households | 2008 |
| Certax Accounting (New Forest) Ltd | Professional & scientific | 2019 |
| Cetia Ltd | Information & communication | 2013 |
| Chadwick Commercials Ltd | Real estate | 2023 |
| Chalc Limited | Professional & scientific | 2023 |
| Chalc Social Limited | Arts & recreation | 2025 |
| Chalke Holding Company Limited | Households | 1960 |
| Channel Court Properties (Barton) Limited | Households | 1982 |
| Chapel Court Management Exeter Ltd | Real estate | 2015 |
| Chapel Gate (Launceston) Management Company Limited | Real estate | 2019 |
| Chapter One Management Company Limited | Households | 2002 |
| Chard Bathroom and Kitchens Ltd | Construction | 2022 |
| Chared Ltd | Hospitality | 2022 |
| Charles Court (Teddington) Residents Association Limited | Households | 1971 |
| Charleston House (Nottingham) Limited | Households | 2008 |
| Charlotte Court (Crediton) Limited | Households | 2012 |
| Charlton Hayes (Belvedere) Management Company Limited | Households | 2013 |
| Charlton Hayes (H14 & H17) Management Company Limited | Households | 2016 |
| Charlton Hayes (H3 H4 & H5) Management Company Limited | Households | 2017 |
| Charlton Hayes (MU2) Management Company Limited | Households | 2015 |
| Charlton Hayes (NO.1) Management Company Limited | Households | 2010 |
| Charlton Hayes (NO.2) Management Company Limited | Households | 2012 |
| Charlton Hayes (NO.3) Management Company Limited | Households | 2012 |
| Charlton Hayes (NO.4) Management Company Limited | Households | 2013 |
| Charlton Hayes (NO.5) Management Company Limited | Households | 2013 |
| Charlton Hayes (NO.6) Management Company Limited | Households | 2013 |
| Charlton Hayes (Phase 11) Management Company Limited | Households | 2014 |
| Charlton Hayes Management Company Limited | Households | 2013 |
| Charman Health & Safety Solutions Limited | Education | 2004 |
| Charmic Ltd | Other services | 2025 |
| Chartcross Limited | Information & communication | 1992 |
| Charter Court (Romsey) Limited | Households | 2007 |
| Charter Walk Management Company Limited | Households | 2019 |
| Chasewood View Management Company Limited | Households | 2013 |
| Chatsworth Park (Winnersh) Management Company Limited | Households | 2004 |
| Chaucer Mead (Redhill) Management Limited | Households | 1991 |
| Chaucombe Place Management Limited | Households | 2001 |
| Chelsea Court Residents Association Ltd | Households | 2005 |
| Chelsea Walk Management Company Limited | Households | 1986 |
| Cheltenham Road (Evesham) Management Company Limited | Households | 2013 |
| Cherry Tree Court (Eastleigh) Limited | Households | 1983 |
| Chertsey Boulevard Management Company Limited | Administrative & support | 2015 |
| Chester Court (Management) Limited | Households | 1990 |
| Chester Point Management Company Limited | Households | 2009 |
| Chestnut Grove (ASH Green) Management Company Limited | Households | 2021 |
| Chestnut House (Burnham) Management Company Limited | Households | 2005 |
| Chestnut Park (Phase 2) Management Company Limited | Households | 2018 |
| Chestnut Park (Phase 3) Management Company Limited | Households | 2020 |
| Chestnut Park (Yatton) Management Company Limited | Administrative & support | 2016 |
| Chestnut Place (Ashford) Management Company Limited | Households | 2010 |
| Chewton Foenix Ltd | Real estate | 2024 |
| Chewton Glen Limited | Administrative & support | 2008 |
| Childrey Park Management Company Limited | Households | 2020 |
| Chilmington Rise Residents’ Management Company Limited | Households | 2025 |
| China at Lees Ltd | Hospitality | 2023 |
| Chipping Campden Management Company Limited | Households | 2020 |
| Chiswick Staithe Limited | Households | 1988 |
| Chmaabso Limited | Administrative & support | 2016 |
| Chocolate by Miss Witt Limited | Manufacturing | 2025 |
| Choter Limited | Households | 1997 |
| Christal Clear Heating Ltd | Construction | 2025 |
| Christchurch Garage Doors Limited | Construction | 2011 |
| Christian C&S Ltd | Transport & logistics | 2018 |
| Chubb Heating Limited | Construction | 2014 |
| Church Walk (Bloxwich) Management Company Limited | Households | 2007 |
| Churchfields (Harwood) Management Co Ltd | Households | 2009 |
| City Limits Management Limited | Households | 1997 |
| City Reach (Beckenham) Management Limited | Households | 2002 |
| CJ Beaders Limited | Wholesale & retail | 2009 |
| Claire Court (Highcliffe) Limited | Households | 1985 |
| Claire Court (Walton-On-Thames) Management Company Limited | Households | 1977 |
| Claret Business Consultancy Ltd | Professional & scientific | 2022 |
| Claret Business Solutions Limited | Professional & scientific | 2019 |
| Clark Financial Services Limited | Financial services | 2005 |
| Clarke's Court (Banbury) Management Company Limited | Households | 2004 |
| Classic 10 Ltd | Administrative & support | 2023 |
| Classic Mini Services Ltd | Administrative & support | 2017 |
| Claybury Hall Management Company Limited | Households | 2002 |
| Claybury Villas Management Company Limited | Households | 2004 |
| Claygate Court Residents' Association Limited | Households | 1973 |
| Cleaner Mates Ltd | Administrative & support | 2023 |
| Clear Heat Ltd | Construction | 2025 |
| Clements Gate (Poringland 2) Management Company Limited | Households | 2018 |
| Clemz Trading Ltd | Financial services | 2026 |
| Cleobury Park Management Company Limited | Households | 2010 |
| Cleveland Associates Limited | Professional & scientific | 2021 |
| Clewers Place Management Limited | Real estate | 2015 |
| Clickout Limited | Information & communication | 2000 |
| Cliff Close Management Company Limited | Households | 1968 |
| Cliff Crescent Management Limited | Households | 2000 |
| Cliff Road Management Company Limited | Households | 1979 |
| Clifford Court (2006) Management Company Limited | Households | 2006 |
| Clifton Court (Southbourne) Limited | Households | 1998 |
| Clifton Gardens Management Limited | Real estate | 1990 |
| Clifton Street Plymouth Management Limited | Households | 1987 |
| Clipstone Park (Leighton Buzzard) Management Company Limited | Households | 2018 |
| Clock Room Ltd | Administrative & support | 2017 |
| Cloister Gardens Management Company Limited | Households | 2011 |
| Cloisters (Lymington) Maintenance Limited | Households | 1977 |
| Clover Pastures Management Company Limited | Households | 2020 |