| Claverton/House Management Company Limited | Households | 1982 |
| Claygate Data Limited | Administrative & support | 2020 |
| Cleanscapes Limited | Administrative & support | 2009 |
| Clear Construction Ltd | Construction | 2021 |
| Clear Project Governance Ltd | Construction | 2024 |
| Clear Slate Ltd | Administrative & support | 2017 |
| Clear View 77 Ltd | Other services | 2017 |
| Clearcoat Resin Screeding Limited | Construction | 2026 |
| Clearex Ltd | Administrative & support | 2022 |
| Clem Consult Ltd | Professional & scientific | 2025 |
| Clifton Owners Association Ltd | Real estate | 2023 |
| Climate Wine Consulting Ltd. | Professional & scientific | 2019 |
| Clinformatix Ltd | Information & communication | 2024 |
| Clockfield (Turners Hill) Management Company Limited | Households | 2018 |
| Cloud 8 Digital Ltd | Professional & scientific | 2024 |
| Cloud Business Systems Ltd | Information & communication | 2019 |
| Cloudy Fish Consulting Limited | Information & communication | 2014 |
| Clovers Ground Maintenance Limited | Administrative & support | 2018 |
| CLT Kearl Limited | Construction | 2012 |
| Club Chairs Limited | Wholesale & retail | 2020 |
| Club Pizza Ltd | Hospitality | 2024 |
| CM Robson Limited | Information & communication | 2015 |
| CMB Digital Ltd | Professional & scientific | 2022 |
| CNF Management Company Limited | Households | 2024 |
| CNO Advisory Limited | Professional & scientific | 2025 |
| Cntrl Management Limited | Administrative & support | 2024 |
| Cobbett's Real Ales Limited | Wholesale & retail | 2010 |
| Cobham Safe and Vault Limited | Administrative & support | 2025 |
| Cobonic Limited | Manufacturing | 1976 |
| Cobra Alarms Ltd | Administrative & support | 2026 |
| Cochrane Court (Bookham) Co Ltd | Households | 2004 |
| Cocoa Island Ltd | Hospitality | 2018 |
| Codebook International Limited | Professional & scientific | 1999 |
| Cogs Workshop LLP | | 2022 |
| Cohen & Pearce Limited | Wholesale & retail | 1945 |
| Coldharbour Sports & Social Club | Arts & recreation | 2008 |
| Cole Enterprise Limited | Real estate | 1998 |
| Colin Ritchie Swinney Limited | Financial services | 2014 |
| Collinda Limited | Professional & scientific | 1983 |
| Collins Hobby Products Limited | Manufacturing | 2019 |
| Colspace Limited | Other services | 2014 |
| Columbus Twenty Five Limited | Financial services | 2010 |
| Combobulate PR Ltd | Professional & scientific | 2024 |
| Comiso Media Ltd | Professional & scientific | 2024 |
| Commercial Cleaning Management Solutions Limited | Administrative & support | 2024 |
| Commercial Internet Solutions Limited | Information & communication | 2010 |
| Commerson Ltd | Health & social care | 2025 |
| Commissioning Services Limited | Administrative & support | 1997 |
| Communication Futures C.I.C. | Education | 2026 |
| Comnoco Ltd | Information & communication | 2020 |
| Compass Clothing Limited | Manufacturing | 2024 |
| Compassion Care Surrey Ltd | Health & social care | 2026 |
| Complete IT Support Limited | Information & communication | 2008 |
| Complete PAW Ltd | Wholesale & retail | 2025 |
| Complete Pleisure Limited | Transport & logistics | 2003 |
| Computing Techniques (International) Limited | | 1974 |
| Comspective Limited | Other services | 2015 |
| Conchord Management Limited | Professional & scientific | 2017 |
| Conema Ltd | Real estate | 1999 |
| Confident Smiles Limited | Health & social care | 2009 |
| Conifer Developments Limited | Construction | 2001 |
| Coniston Court (Ashford) Residents Company Limited | Households | 2001 |
| Connectus (UK) Limited | Education | 2004 |
| Connoisseur Policies Limited | Financial services | 1996 |
| Connolly Shaw Holdings Limited | Professional & scientific | 1928 |
| Consult GL Smith Ltd | Administrative & support | 2017 |
| Content Sauce Ltd | Professional & scientific | 2026 |
| Context Films Ltd | Administrative & support | 2016 |
| Conyers Family PIC Ltd | Financial services | 2019 |
| Coolhurst Close Management Company Limited | Households | 2018 |
| Coombers Developments Limited | Construction | 2021 |
| Coombers Residents Management Company Limited | Real estate | 2023 |
| Coppe Forbes Russo Limited | Professional & scientific | 1960 |
| Copper Consult Ltd | Professional & scientific | 2020 |
| Copsbridge Farm Ponies Ltd | Agriculture & fishing | 2023 |
| Copthorne Place Management Company Limited | Households | 2005 |
| Coracoid Orthopaedics Limited | Health & social care | 2004 |
| Cordell and Co Group Ltd | Financial services | 2025 |
| Cordell and Co Legal Ltd | Professional & scientific | 2025 |
| Cormorant Technology Ltd | Wholesale & retail | 2024 |
| Cornbury Festival Limited | Administrative & support | 2010 |
| Corner Construction Limited | Construction | 2013 |
| Corollious Limited | Professional & scientific | 2022 |
| Corporate Capital Partners Limited | Financial services | 1990 |
| Corporate JET Investor Limited | Information & communication | 2023 |
| Corsair Investments Ltd | Financial services | 2023 |
| Corston Hollow Limited | Households | 2011 |
| Corston Hollow Residents Limited | Households | 1981 |
| Cortec Solutions Limited | Information & communication | 2000 |
| Costume by Blue Limited | Wholesale & retail | 2022 |
| Courtbell Limited | Agriculture & fishing | 2010 |
| Courtenay Place (Dorking) Management Limited | Real estate | 2002 |
| Courtyard Real Estate Limited | Real estate | 2016 |
| Cousin & Keys Ltd | Real estate | 2025 |
| Cove Chasers Ltd | Wholesale & retail | 2023 |
| Covercloud Limited | Financial services | 2013 |
| Coverpal Ltd | Information & communication | 2022 |
| Cowans Solicitors LLP | | 2014 |
| CPW Marketing Limited | Administrative & support | 2017 |
| Craft Design Studio Limited | Construction | 2017 |