| Carlton Leisure (UK) Limited | Administrative & support | 1992 |
| Caroline's Cookery Ltd | Hospitality | 2014 |
| Carpenters Nursery Holdings Ltd | Real estate | 2023 |
| Carpenters Nursery Ltd | Wholesale & retail | 2015 |
| Carruthers Holdings Ltd | Real estate | 2017 |
| Carter John Commissioning Limited | Professional & scientific | 2001 |
| Carter Windows Ltd | Administrative & support | 2021 |
| Carterfuchs Energy Consultants Limited | Administrative & support | 2011 |
| Cartisan Ltd | Construction | 2019 |
| Cartrack Investments UK Limited | Administrative & support | 2013 |
| Cartwright Family Property Investment Ltd | Real estate | 2022 |
| CAS Building Contracting Limited | Construction | 2017 |
| Casa Dolce (Investments) Ltd | Real estate | 2020 |
| Cascade Street Limited | Professional & scientific | 2015 |
| Casello Home Design Ltd | Construction | 2021 |
| Casello Ltd | Wholesale & retail | 2009 |
| Castle Moat EMV Limited | Wholesale & retail | 2020 |
| Castle Partners Ltd | Real estate | 2011 |
| Castlelough Consultancy Limited | Professional & scientific | 2024 |
| Castwell Builders Ltd | Construction | 2000 |
| Castwell Homes Limited | Real estate | 2016 |
| Catalyst Data Ltd | Information & communication | 2026 |
| Catalyst Events Limited | Professional & scientific | 2024 |
| Catering Spice Ltd | Manufacturing | 2022 |
| Cathedral Tower Developments Limited | Construction | 2025 |
| Cathedral Tower Properties Limited | Real estate | 2025 |
| Cathetix Ltd | Information & communication | 2024 |
| Catto Trading Limited | Professional & scientific | 1982 |
| Causse Culpan Consult Ltd | Professional & scientific | 2011 |
| Cavendish Buildings Limited | Households | 1985 |
| Cavendish Enterprises Ltd | Wholesale & retail | 2022 |
| Caversham HC Consortium Limited | Wholesale & retail | 2011 |
| CB Gaming Solutions Ltd | Arts & recreation | 2018 |
| CB International Sporthorses Limited | Agriculture & fishing | 2016 |
| CB IT Consultancy Limited | Information & communication | 2022 |
| CB Periodontics Limited | Health & social care | 2013 |
| CBJ Digital Ltd | Information & communication | 2003 |
| CBT Anglia Limited | Other services | 2011 |
| CCK Distribution Ltd | Wholesale & retail | 2018 |
| CCK Video Services Limited | Professional & scientific | 2004 |
| Ccktech Ltd | Wholesale & retail | 1993 |
| CD Parte Associates Limited | Real estate | 1998 |
| CEA Productions Limited | Hospitality | 2023 |
| Cecil Park (Eaton House) Management Limited | Households | 1984 |
| Cedar Park Limited | Financial services | 2021 |
| Celestial Mortgages Limited | Financial services | 2026 |
| Celestite Limited | Information & communication | 2019 |
| Cellpay Ltd | Information & communication | 2021 |
| Celtrup Limited | Administrative & support | 2026 |
| Censpira Ltd | Information & communication | 2011 |
| Censura Ltd | Administrative & support | 2003 |
| Central Asia DUE Diligence Ltd | Professional & scientific | 2022 |
| Central Central (AH) Ltd | Real estate | 2020 |
| Central Central Business Solutions Ltd | Professional & scientific | 2013 |
| Central Central Properties Ltd | Real estate | 2013 |
| Central Leicester Ltd | Real estate | 2019 |
| Central Properties Limited | Real estate | 1998 |
| Centre Circle Consulting Limited | Professional & scientific | 2020 |
| Centric Plumbers Ltd | Construction | 2024 |
| CEP Forest Limited | Education | 2021 |
| Ceraj Homes Limited | Real estate | 2026 |
| Cerraine Energy Limited | Wholesale & retail | 2023 |
| CG & Co Property Developments Limited | Construction | 2024 |
| CG & Co Property Investments Limited | Real estate | 2024 |
| Chadwell Holdings Limited | Real estate | 2019 |
| Chadwell Medical Limited | Administrative & support | 2015 |
| Chagcrest Holdings Limited | Extraterritorial | 2018 |
| CHAI2WINE Ltd | Professional & scientific | 2025 |
| Chaitra Group Limited | Wholesale & retail | 2024 |
| Chamberlain Partnership Limited | Professional & scientific | 2019 |
| Chamberlayne Investments Limited | Real estate | 2020 |
| Chana Property Investments Limited | Real estate | 2016 |
| Chana Reality Group Ltd | Real estate | 2024 |
| Change Dynamics 360 Ltd | Information & communication | 2013 |
| Chapels Properties Limited | Real estate | 2005 |
| Chaplins Furniture Ltd | Wholesale & retail | 2005 |
| Charge Media Limited | Extraterritorial | 2022 |
| Charge Point Media Limited | Extraterritorial | 2022 |
| Charles Bruce Consulting Limited | Professional & scientific | 2018 |
| Charly Inc Ltd | Professional & scientific | 2016 |
| Charter Heating Services Limited | Construction | 1975 |
| Chatterjee Consultants Limited | Information & communication | 2014 |
| Chavan Property Letting Limited | Real estate | 2015 |
| Cheeky Scone Limited | Hospitality | 2021 |
| Chells Dental Practice Limited | Health & social care | 2009 |
| Chelmsford Wellbeing Centre Ltd | Real estate | 2021 |
| Chelsea Estates and Management Ltd | Real estate | 2019 |
| Chelsea Maternity Care Limited | Health & social care | 2014 |
| Chelsea Obstetrics Limited | Health & social care | 2012 |
| Chelwood Apartments Limited | Real estate | 2018 |
| Chemistrx Ltd | Health & social care | 2021 |
| Chequers Lane Watford Ltd | Extraterritorial | 2025 |
| Cherokee Developments Limited | Construction | 1997 |
| Cherry Hill Childrens Day Nursery Limited | Education | 2006 |
| Cherry Hill Childrens Nursery Limited | Professional & scientific | 2015 |
| Cherry Trade Limited | Construction | 2016 |
| Chessington Court Residents Association (Pinner) Limited | Households | 1959 |
| Chief Contractors Limited | Construction | 2015 |
| Child Health Consultancy Ltd | Education | 2024 |
| Chilled OUT Logistics Limited | Transport & logistics | 2025 |