| Citizens Advice Surrey Heath | Health & social care | 2007 |
| City Waste Services Ltd | Construction | 2026 |
| CJB Enterprise Limited | Professional & scientific | 2016 |
| CJF Advisory Limited | Public administration | 2025 |
| CKJ Contracts Limited | Professional & scientific | 2007 |
| Claire Brown Coaching and Consulting Limited | Professional & scientific | 2018 |
| Claire Lloyd Properties Limited | Extraterritorial | 2006 |
| Clarewood Residents' Management Company Limited(The) | Real estate | 1980 |
| Clarkes Builders Ltd | Construction | 2009 |
| Clayton Davies Ltd | Administrative & support | 2024 |
| Clayton House Freehold Limited | Households | 2016 |
| Clayton Works Ltd | Wholesale & retail | 2026 |
| Clean Cart Ltd | Wholesale & retail | 2026 |
| Clean Exit Ltd | Administrative & support | 2026 |
| Clean Image Investments Limited | Extraterritorial | 1997 |
| Clean Linen Services Limited | Other services | 1906 |
| Clean Viking Acquisition Co Limited | Other services | 2015 |
| Clean Viking Bidco Limited | Other services | 2014 |
| Clean Viking Holdings Limited | Other services | 2014 |
| Clean Watford Limited | Other services | 2015 |
| Cleaning & Ironing Ltd | Administrative & support | 2019 |
| Clear Flow Ducting Limited | Administrative & support | 1984 |
| Clear Sound Solutions Ltd | Health & social care | 2026 |
| Clearglen Limited | Administrative & support | 1976 |
| Clearview Bookkeeping Services Ltd | Professional & scientific | 2026 |
| Cleekdevelopments Ltd | Construction | 2024 |
| Cleo's Diamond Services Ltd | Other services | 2016 |
| Clevedon Court Consulting Ltd | Professional & scientific | 2018 |
| Clever Marketing Limited | Administrative & support | 2007 |
| Click N MIX Ltd | Wholesale & retail | 2020 |
| CLICK-2-POST Ltd | Transport & logistics | 2016 |
| Client Global Services Limited | Professional & scientific | 2025 |
| Client Securepay Ltd | Wholesale & retail | 2025 |
| Climate Environmental Limited | Construction | 2010 |
| Cliniglow Ltd | Extraterritorial | 2023 |
| Clinix Essentials Ltd | Wholesale & retail | 2026 |
| Clintel Limited | Professional & scientific | 2021 |
| CLM Surveyors LLP | | 2015 |
| Clmn Future Limited | Professional & scientific | 2026 |
| Cloud 9 Balloons Ltd | Wholesale & retail | 2023 |
| Cloud Cartel Ltd | Wholesale & retail | 2025 |
| Cloud Development Group Limited | Information & communication | 2023 |
| Cloud Live Limited | Professional & scientific | 2009 |
| Cloud Nine Vision Ltd | Information & communication | 2025 |
| Cloud Simplified Technologies Ltd | Information & communication | 2021 |
| Cloudco Books Limited | Professional & scientific | 2016 |
| Cloudcom UK Ltd | Information & communication | 2011 |
| Club Maritimo Properties Limited | Professional & scientific | 1993 |
| Club Tropical Title Limited | Professional & scientific | 2012 |
| Cluck Cluck Peri Peri Ltd | Hospitality | 2025 |
| CM Concepts Ltd | Professional & scientific | 2024 |
| CM Pearson Limited | Administrative & support | 2016 |
| CM Vixens Ltd | Hospitality | 2023 |
| CMS Action Ltd | Arts & recreation | 2026 |
| CMS Training Ltd | Professional & scientific | 2003 |
| CND Trading Limited | Financial services | 2011 |
| Cnet Construction Limited | Construction | 2023 |
| Coach Down Under Limited | Administrative & support | 2019 |
| Coach House Close Limited | Households | 2012 |
| Cobalt Racing Ltd | Wholesale & retail | 2024 |
| Cochin Associates Ltd | Information & communication | 2025 |
| Cochrane Trading Ltd | Professional & scientific | 2024 |
| Code Crafters LAB Limited | Information & communication | 2024 |
| Code Experts Ltd | Information & communication | 2018 |
| Codefish Consulting Limited | Information & communication | 2011 |
| Cody's Guitars Ltd | Wholesale & retail | 2026 |
| Cogitatio Limited | Information & communication | 2010 |
| Cognitus Ltd | Professional & scientific | 2011 |
| Cohoda Limited | Information & communication | 2012 |
| Cole Henley Homes Limited | Real estate | 2019 |
| Cole's Gutters & Roofing Services Ltd | Construction | 2019 |
| Colex Holdings UK Limited | Real estate | 2019 |
| Coley House Management Company Limited | Households | 2009 |
| Coley Park Farm Freehold Limited | Real estate | 1995 |
| Coley Park Farm Residents Association Limited | Real estate | 1986 |
| Colin Sawyer & SON Builders Limited | Construction | 2014 |
| Collectively Camberley Limited | Administrative & support | 2011 |
| Collectors Card Vault Limited | Wholesale & retail | 2025 |
| College Town Montessori (Group) Limited | Education | 2021 |
| Collingwood College | Education | 2011 |
| Collingwood Mount Management Company Limited | Households | 1985 |
| Collins Office Support Limited | Administrative & support | 2025 |
| Colonial Sporting Limited | Arts & recreation | 2025 |
| Colver Services Ltd | Public administration | 2022 |
| Colville Court Residents Association Limited | Households | 1988 |
| Combined Villas Limited | Real estate | 1988 |
| Comfy Cove Limited | Real estate | 2025 |
| Communitech Recruitment Group Limited | Administrative & support | 2021 |
| Community Generation Fund Limited Partnership | | 2012 |
| Community Tennis Limited | Arts & recreation | 2015 |
| Comodo Design & Build Ltd | Construction | 2022 |
| Compact Bathrooms Ltd | Other services | 2011 |
| Compass Technical Limited | Construction | 2018 |
| Complete Fitness Studios Ltd | Education | 2013 |
| Complete Fitness Training LLP | | 2022 |
| Complete Kitchen Solutions Ltd | Wholesale & retail | 2002 |
| Complete Sign Solutions Limited | Manufacturing | 2006 |
| Complex Audio Visual Ltd | Information & communication | 2008 |
| Complex Care 24 Limited | Health & social care | 2025 |
| Compliance Europe Ltd | Information & communication | 2017 |