| CARBON8 Consulting Ltd | Information & communication | 2024 |
| Cardaenea Limited | Financial services | 2017 |
| Care Agnes Limited | Health & social care | 2021 |
| Care Companions Surrey Limited | Health & social care | 2024 |
| Care Fall Stunts Limited | Information & communication | 2022 |
| Care Quality PS Limited | Health & social care | 2023 |
| Care Universe Ltd | Health & social care | 2016 |
| Careersprings Ltd | Education | 2025 |
| Carestem Ltd | Information & communication | 2023 |
| Caretopia Ltd | Health & social care | 2024 |
| Cargo Nova Ltd | Transport & logistics | 2026 |
| Carisbrooke Glass Limited | Construction | 2016 |
| Carkeel Plotholders Limited | Real estate | 2012 |
| Carla Higgs Limited | Professional & scientific | 2026 |
| Carlton Mews Freehold Limited | Households | 2023 |
| Carnaby Maxwell Limited | Households | 2018 |
| Carnell Warren Associates Limited | Administrative & support | 1991 |
| Caroline South Associates Management Services Limited | Wholesale & retail | 2001 |
| Caroline South Recruitment Limited | Administrative & support | 2021 |
| Carrdc Management Services Ltd | Professional & scientific | 2012 |
| Carrera Associates Limited | Real estate | 1996 |
| CARS2CONNECT Ltd | Transport & logistics | 2023 |
| Carta Rallye Limited | Administrative & support | 2014 |
| Carter&Perendic Ltd | Manufacturing | 2022 |
| Carving Consulting Limited | Manufacturing | 2025 |
| Carwyn Plumbing & Heating Ltd | Construction | 2025 |
| Cary Consulting Ltd | Professional & scientific | 2017 |
| Casa Developments Limited | Construction | 1971 |
| Casakoo Business Solutions Limited | Administrative & support | 2004 |
| Castay Business Services Limited | Professional & scientific | 2024 |
| Castay Services Limited | Real estate | 2014 |
| Castellani Ltd | Professional & scientific | 2019 |
| Castle Carpenters Limited | Construction | 2004 |
| Castle Construction (Surrey) Limited | Construction | 2025 |
| Castle Eaton Construction Ltd | Construction | 2007 |
| Castle Eaton Holdings Ltd | Construction | 2021 |
| Castle Phillips (Holdings) Limited | Financial services | 1968 |
| Castle Phillips Finance Company Limited | Financial services | 1971 |
| Castle Residential Holdings Limited | Financial services | 2017 |
| Castle Residential Homes Limited | Construction | 2017 |
| Castle Residential Investments Limited | Real estate | 2017 |
| Castle Wharf. Partnership LLP | | 2009 |
| Castle Works Developments Limited | Administrative & support | 2015 |
| Castle Works Holdings Limited | Administrative & support | 2015 |
| Castlecroft Associates Limited | Information & communication | 1998 |
| Caswell Consultancy Limited | Professional & scientific | 2012 |
| Catalyst Support Limited | Health & social care | 1998 |
| Catchword Limited | Wholesale & retail | 2025 |
| Catering Trading Limited | Hospitality | 2025 |
| Cathew Limited | Real estate | 2019 |
| Catwood Games Ltd | Information & communication | 2017 |
| Caulfield Search (Europe) Ltd. | Extraterritorial | 2015 |
| Cavalier Court Management Company Limited | Households | 1980 |
| Cavendish House at Hartington Limited | Real estate | 2019 |
| Cavendish Sporting Events Limited | Arts & recreation | 2008 |
| Cavo International Limited | Manufacturing | 2026 |
| Cawley Road Property Management Company Limited | Extraterritorial | 2008 |
| Cawthorne Group Ltd | Administrative & support | 2025 |
| CC Marketing Communications Limited | Administrative & support | 2014 |
| CC Woking Limited | Hospitality | 2025 |
| Cccp Films Limited | Other services | 2009 |
| CCM Ball Property Investments Limited | Real estate | 2018 |
| Cctv Global London Ltd | Wholesale & retail | 2013 |
| Cdlm Developments Ltd | Construction | 2021 |
| Cdnuk Ltd | Information & communication | 2023 |
| CDO Sound Ltd | Professional & scientific | 2026 |
| Cecchetti Ballet Associates Ltd | Arts & recreation | 2025 |
| Cedar Gardens Management Company Limited | Households | 2005 |
| Cedarlea Limited | Professional & scientific | 1989 |
| Cedarmist Services Ltd | Administrative & support | 2009 |
| Celestine Productions Ltd | Information & communication | 2018 |
| Cellsoft Solutions Limited | Information & communication | 2024 |
| Celluloid JAM Limited | Other services | 2011 |
| Celtic VFX Ltd | Information & communication | 2025 |
| Cemesis Limited | Information & communication | 2007 |
| Cencora International Holdings Limited | Financial services | 2021 |
| Centaur Consulting Limited | Professional & scientific | 2002 |
| Central Surrey Health Limited | Health & social care | 2006 |
| Central Surrey Health Trustee Limited | Extraterritorial | 2005 |
| Centrium Freehold Limited | Households | 2006 |
| Centurion Quant Ltd | Construction | 2018 |
| Century Television Limited | Information & communication | 2010 |
| CEP2 Hsng Limited | Real estate | 2025 |
| Cestida Limited | Information & communication | 2009 |
| CFC Topco Limited | Financial services | 2025 |
| CFM Compressor Services Ltd | Manufacturing | 2020 |
| CG RTM Company Limited | Households | 2026 |
| CG Shernold Ltd | Administrative & support | 2022 |
| Chaify Ltd | Wholesale & retail | 2024 |
| Chaiguyzz Limited | Hospitality | 2021 |
| Chakana Medical Ltd | Health & social care | 2018 |
| Challenge Marketing Group Limited | Professional & scientific | 2017 |
| Champ MART1 Ltd | Wholesale & retail | 2026 |
| Chancery House (ST Johns) LLP | | 2009 |
| Chandlers (ST Johns) Management Company Limited | Households | 2011 |
| Change Academy Consulting Ltd | Administrative & support | 2022 |
| Change Management Solutions Limited | Professional & scientific | 2009 |
| Channel Marketing Solutions Limited | Extraterritorial | 1999 |
| Channel One Broadcasting Limited | Information & communication | 2024 |
| Channing Services Ltd | Financial services | 2019 |