| Canbury Place Properties Ltd | Real estate | 2021 |
| Canbury Press Ltd | Information & communication | 2013 |
| Canbury Projects Limited | Construction | 2025 |
| Canbury Property Management Ltd | Real estate | 2016 |
| Canbury School Limited | Education | 1990 |
| Canbury Solutions Ltd | Administrative & support | 2015 |
| Canbury Works Limited | Other services | 2016 |
| Candaply Limited | Information & communication | 2026 |
| Canellari Consulting Limited | Information & communication | 2020 |
| Canopy Beer Company Ltd | Manufacturing | 2014 |
| Canstar Limited | Construction | 2017 |
| Canterbury Court (Freehold) Company Ltd | Real estate | 2018 |
| Canterbury Court Flats Management Company Limited | Households | 2006 |
| CAP Regeneration Consultants Ltd | Construction | 2014 |
| Capacitive Technologies Limited | Professional & scientific | 2013 |
| Cape Wrath Films Ltd | Information & communication | 2011 |
| Capepoint Co. Ltd | Administrative & support | 2006 |
| Capheaton Consulting Ltd | Professional & scientific | 2021 |
| Capital City Accountancy Limited | Professional & scientific | 2010 |
| Capital Finance and Property Ltd | Administrative & support | 2015 |
| Capitaly Ltd | Real estate | 2025 |
| Cappadocia Properties Ltd | Real estate | 2013 |
| Cappaexpress Ltd | Hospitality | 2020 |
| Caprice Enterprises Limited | Arts & recreation | 1997 |
| Caprioli Design Ltd | Professional & scientific | 2014 |
| Carb Club Ceramics Ltd | Hospitality | 2025 |
| Card Express Properties Limited | Households | 2025 |
| CARD23 Limited | Real estate | 2023 |
| CARD23UK Limited | Households | 2025 |
| Cardabelle Ltd | Manufacturing | 2023 |
| Care One Limited | Health & social care | 2001 |
| Care Supplies UK Ltd | Wholesale & retail | 2024 |
| Careforme Solution Ltd | Health & social care | 2014 |
| Carenet Staffing Solutions Ltd | Administrative & support | 2021 |
| Carib Eats CIC | Hospitality | 2020 |
| Caring for People Ltd | Health & social care | 2025 |
| Carland Holdings Limited | Administrative & support | 2001 |
| Carlcare Limited | Health & social care | 2006 |
| Carlingford Consultancy Limited | Professional & scientific | 2014 |
| Carlita Digital Ltd | Wholesale & retail | 2025 |
| Carlyle Kingswood Global Ltd | Administrative & support | 2014 |
| Carlyle Kingswood Global Search Ltd | Administrative & support | 2013 |
| Caroline Mccall Limited | Administrative & support | 2013 |
| Caroline Morin Ltd | Information & communication | 2026 |
| Carolus Magnus Limited | Wholesale & retail | 2020 |
| Carringtons Residential Limited | Real estate | 2017 |
| Cartacb Limited | Professional & scientific | 2025 |
| Carter Bells LLP | | 2005 |
| Carters Grove (Kings Hill) Management Limited | Households | 2004 |
| Cartilage Repair Systems Ltd | Manufacturing | 2019 |
| Cartlidge Morland Financial Services Limited | Professional & scientific | 2003 |
| Cartlidge Morland International Limited | Administrative & support | 1997 |
| Cartlidge Morland Limited | Financial services | 1998 |
| Cartlidge Morland Trustees Limited | Administrative & support | 2000 |
| Cartlidge Morland Wealth Management LLP | | 2015 |
| Casa Italia London Ltd | Wholesale & retail | 2016 |
| Casablanca Events Limited | Arts & recreation | 2025 |
| Caseware Europe Limited | Information & communication | 2002 |
| Caseware Software Holdings Limited | Information & communication | 2001 |
| Caseware UK Limited | Information & communication | 1997 |
| Cass Legal Limited | Professional & scientific | 2014 |
| Castell Communications Limited | Information & communication | 2007 |
| Castelnau Mansions Limited | Administrative & support | 2003 |
| Castle Point Holidays Limited | Hospitality | 2018 |
| Castle Wildish Residential Limited | Administrative & support | 2013 |
| Castrum Estates Limited | Administrative & support | 2015 |
| Casual Lighting Limited | Wholesale & retail | 2021 |
| Cat Hill Gallery Ltd | Wholesale & retail | 2006 |
| Cat Hill Productions Limited | Information & communication | 1996 |
| Catchfly Limited | Professional & scientific | 2016 |
| Catherine Monk Interiors Limited | Professional & scientific | 2012 |
| Cathleen Naundorf Photographs Limited | Professional & scientific | 2015 |
| Cattaneo Commercial Limited | Real estate | 1990 |
| Cavendish Court (Richmond) Residents Association Limited | Households | 1982 |
| Cavi Interior Design Limited | Professional & scientific | 2022 |
| Cavok Limited | Information & communication | 1996 |
| Caylaw Limited | Professional & scientific | 2006 |
| CB Roofing and Guttering Limited | Construction | 2025 |
| Cbrisk Ltd | Information & communication | 2012 |
| Ccpcontracts Ltd | Construction | 2025 |
| CCT Tech Limited | Information & communication | 2025 |
| CDP Photography Limited | Professional & scientific | 2011 |
| CDR Advisory Limited | Financial services | 2015 |
| CDR Electrical Ltd | Construction | 2023 |
| Cedarbay Education Ltd | Education | 2023 |
| Cedarbay Property Ltd | Real estate | 2022 |
| Cedars & Larches Care Ltd | Health & social care | 2023 |
| Ceerisk Consulting Limited | Professional & scientific | 2015 |
| Cello Limited | Professional & scientific | 2018 |
| CEM Construction Ltd | Construction | 2014 |
| Cengp Limited | Financial services | 2024 |
| Central One Limited | Wholesale & retail | 2013 |
| Central Ship Management and Services Limited | Financial services | 1979 |
| Centre Associates Limited | Professional & scientific | 2017 |
| Centre for Pakistan Studies & Development | Other services | 2018 |
| Centre for Teams Consultancy Limited | Professional & scientific | 2004 |
| Centred Journeys Ltd | Administrative & support | 2019 |
| Century Place (Pulborough) Management Company Limited | Households | 2015 |
| CEO Music Limited | Information & communication | 2018 |
| Cerba Research UK Ltd | Administrative & support | 2021 |