| Corridors of Uncertainty Limited | Arts & recreation | 2020 |
| Corrodere Limited | Other services | 2019 |
| COS Visuals Ltd | Professional & scientific | 2022 |
| Cost Build (Farnham) Limited | Professional & scientific | 2026 |
| Cosy Meerkat Ltd | Professional & scientific | 2018 |
| Cotswold Roof Cleaning Ltd | Administrative & support | 2023 |
| Cotton Bound Creations Ltd | Manufacturing | 2019 |
| Cotton House Estates Ltd | Households | 2024 |
| Council for the Registration of Schools Teaching Dyslexic Pupils | Education | 1996 |
| Counterpoint Aviation Limited | Education | 2019 |
| Country Services Pest Control Limited | Administrative & support | 2002 |
| Country Shutters Limited | Manufacturing | 2015 |
| Countrystyle Roofing Ltd | Construction | 2024 |
| County Installations Limited | Manufacturing | 2005 |
| Court Estate (Curtilage) Limited | Real estate | 1965 |
| Courtwood Systems Ltd | Information & communication | 1999 |
| Covenant Corporation Ltd | Real estate | 2016 |
| Covering Surrey Roofing Services Limited | Construction | 2024 |
| Covet.Pics Limited | Information & communication | 2023 |
| Coveway Heights Limited | Households | 2010 |
| Covostra Ltd | Professional & scientific | 2021 |
| CR Aviation Engineering Services Limited | Manufacturing | 2020 |
| CR Toners Ltd | Administrative & support | 2021 |
| Craig Garner Electrical Ltd | Construction | 2020 |
| Cranborne Lodge Limited | Hospitality | 2023 |
| Cranbourne Albion Limited | Professional & scientific | 2013 |
| CRE8TIVE Space Limited | Construction | 2013 |
| Cream M&E Solutions Limited | Administrative & support | 2023 |
| Create Bikes Trading Ltd | Manufacturing | 2017 |
| Creative Assistants Agency Ltd | Administrative & support | 2019 |
| Creative Food Consultants Limited | Hospitality | 2019 |
| Creative HE Limited | Professional & scientific | 2025 |
| Credland Technical Limited | Information & communication | 2013 |
| Credo Consultancy Limited | Administrative & support | 1998 |
| Credo Consultants Limited | Information & communication | 2015 |
| Cresswell Solutions Limited | Professional & scientific | 2012 |
| CRG AC Limited | Construction | 2023 |
| CRG Direct Limited | Wholesale & retail | 2017 |
| CRG Property Services Ltd | Real estate | 2026 |
| Crichton Court Management Company Limited | Households | 2003 |
| Crimson Trees Consulting Limited | Other services | 2017 |
| Crimt Capital Limited | Financial services | 2024 |
| Cripps Construction Services Ltd | Construction | 2022 |
| Crisp Engineering Solutions Ltd | Professional & scientific | 2019 |
| Crispin Consulting Solutions Ltd | Professional & scientific | 2025 |
| Critical Healthcare Consulting Ltd | Health & social care | 2022 |
| Critical Outcomes Ltd | Professional & scientific | 2011 |
| Critter Control Ltd | Administrative & support | 2025 |
| Crockwell Solutions Limited | Information & communication | 2020 |
| Crocodile Cleaning LLP | | 2011 |
| Cromer House Freehold Limited | Households | 2022 |
| Crondall Consultancy Limited | Administrative & support | 2014 |
| Crondall Creations Ltd | Wholesale & retail | 2024 |
| Crondall Energy Holdings Ltd | Mining & quarrying | 2024 |
| Crondall Energy Ltd | Mining & quarrying | 2018 |
| Crondall Energy Subsea Ltd | Professional & scientific | 2011 |
| Crondall Events CIC | Arts & recreation | 2006 |
| Crondall Heights Residents Company Limited | Households | 2012 |
| Crookham Grange Management Company (Hampshire) Limited | Households | 1985 |
| Crosby Gate Property Limited | Real estate | 2019 |
| Crossways (Earley) Management Company Limited | Households | 1998 |
| Crowline Limited | Manufacturing | 2016 |
| Crown Carpentry Surrey Ltd | Construction | 2025 |
| Crown Development Services Ltd | Construction | 2018 |
| Crown Loft Solutions Ltd | Construction | 2025 |
| Crowned Autos Limited | Wholesale & retail | 2024 |
| Crownwood Gate Management (Farnham) Limited | Households | 2010 |
| Crundwell Court Management Co. Limited | Households | 1977 |
| Crush.Pics Limited | Information & communication | 2023 |
| Cryotech Computers Ltd | Information & communication | 2025 |
| CS Nursery Schools Ltd | Education | 2010 |
| CS Partnership LLP | | 2004 |
| CSC Tooling Limited | Wholesale & retail | 2013 |
| CSJ Estates Ltd | Real estate | 2012 |
| CSJ Management Ltd | Households | 2020 |
| CT Private Clients Limited | Professional & scientific | 2026 |
| Ctech Limited | Wholesale & retail | 2002 |
| CTN Refurbishment Ltd | Construction | 2023 |
| Cubra Limited | Arts & recreation | 2014 |
| Cullens Mews Management Limited | Households | 1986 |
| Cult WAX Ltd | Wholesale & retail | 2018 |
| Cultura Group Holdings Ltd | Administrative & support | 2016 |
| Culzean Enterprises Limited | Real estate | 2009 |
| Cumbrae Partners LLP | | 2022 |
| Cummings Law LLP | | 2020 |
| Cummings Pepperdine Ltd | Professional & scientific | 2020 |
| Curlew Opportunities Limited | Financial services | 2016 |
| Currently Unnamed Productions Limited | Information & communication | 2022 |
| Curve & Caffeine Ltd | Wholesale & retail | 2026 |
| Cyan Digital Limited | Professional & scientific | 2003 |
| Cyan Group Ltd | Administrative & support | 1997 |
| Cyan Recruitment Ltd | Administrative & support | 2021 |
| Cyan Vine Limited | Wholesale & retail | 2012 |
| Cyber Alarm Limited | Professional & scientific | 2017 |
| Cyberglow Studio Limited | Arts & recreation | 2023 |
| Cybersecurity & Media Services Limited | Information & communication | 2026 |
| Cyberzonic Limited | Information & communication | 2015 |
| Cyrus Properties Ltd | Real estate | 2024 |
| CYT Travel Limited | Administrative & support | 2022 |
| Czechoslovakian Vlciak Club UK | Wholesale & retail | 2019 |