| Church Hill Dental Care Limited | Health & social care | 2010 |
| Chwmc Commercial Services Ltd | Professional & scientific | 2024 |
| Chyns Beauty Ltd | Other services | 2025 |
| Ciao Bella Agency Ltd | Extraterritorial | 2012 |
| Ciao Bella Events Ltd | Administrative & support | 2011 |
| Cipcr Intl Ltd | Professional & scientific | 2013 |
| Cipherblock Lettings Ltd | Real estate | 2023 |
| Cipherblock Security Ltd | Information & communication | 2021 |
| Circuit Classics Ltd | Wholesale & retail | 2016 |
| Circuits Connect Limited | Wholesale & retail | 2026 |
| Cittam Properties Ltd | Real estate | 2025 |
| City Bites Crawley Ltd | Hospitality | 2025 |
| City Cars Gatwick Ltd | Transport & logistics | 2022 |
| City Cars Redhill Ltd | Transport & logistics | 2018 |
| City Cool Holdings Limited | Real estate | 2005 |
| City Cool Limited | Wholesale & retail | 2008 |
| City Law Practice Ltd | Professional & scientific | 2012 |
| City Winners Limited | Other services | 2007 |
| CJ 7 Properties Limited | Real estate | 2021 |
| CJ Hospitality Limited | Hospitality | 2025 |
| Cjscafe Ltd | Hospitality | 2017 |
| Ckvh Ltd | Professional & scientific | 2020 |
| Cl-Air Freelance Limited | Professional & scientific | 2018 |
| Claire Sanders Property Limited | Real estate | 2020 |
| Claire Widdows Creative Projects Ltd | Professional & scientific | 2020 |
| Clarity Tech Distribution Ltd | Wholesale & retail | 2026 |
| Clarkwell Holdings Limited | Households | 2025 |
| Classic Services Group Limited | Administrative & support | 1999 |
| Classique for Brides Limited | Wholesale & retail | 1996 |
| Claybrook Computing Limited | Financial services | 1976 |
| Clean and Green Services Limited | Administrative & support | 2026 |
| Clean Checkin Ltd | Administrative & support | 2025 |
| Cleanex Services Ltd | Administrative & support | 2025 |
| Cleaning Wonders Ltd | Other services | 2016 |
| Cleanstead Limited | Administrative & support | 2025 |
| Clearedaway Ltd | Water & waste | 2018 |
| Clearly Compliance Limited | Financial services | 2005 |
| Clearways International Limited | Extraterritorial | 2024 |
| Clickandscale Ltd | Information & communication | 2026 |
| Client Service Coach Ltd | Wholesale & retail | 2025 |
| Clientfirst Ltd | Wholesale & retail | 2025 |
| Climate Actions NOW | Professional & scientific | 2009 |
| Clique Investments Limited | Real estate | 2016 |
| CLM Car Repair Ltd | Wholesale & retail | 2020 |
| Clock Tower Limited | Real estate | 2023 |
| Cloister Resourcing Limited | Administrative & support | 2010 |
| Clothing Estates Ltd | Wholesale & retail | 2020 |
| Cloud Aerodrones Ltd | Professional & scientific | 2024 |
| Cloud Shopper Ltd | Wholesale & retail | 2023 |
| Cloudologist Ltd | Information & communication | 2017 |
| Cloudsec Systems Ltd | Administrative & support | 2013 |
| Cloverdene Consulting Limited | Professional & scientific | 2017 |
| CLUB16 Ltd | Real estate | 2024 |
| CLUB19 Ltd | Other services | 2019 |
| CM Crawley Ltd | Hospitality | 2025 |
| CM01 Limited | Information & communication | 2020 |
| Cmacs (Software) Limited | Information & communication | 1993 |
| Cmgc Limited | Professional & scientific | 2013 |
| CMH Parts Ltd | Wholesale & retail | 2015 |
| CMW Central Ltd | Wholesale & retail | 2026 |
| Coaching & Therapy With Karen Richardson Ltd | Professional & scientific | 2024 |
| Coastal Delight Fine Food and Drinks UK Limited | Wholesale & retail | 2021 |
| Cockpit Quiz Ltd | Education | 2026 |
| Cocks Kettles Ltd | Wholesale & retail | 2026 |
| Coco Mims Limited | Wholesale & retail | 2011 |
| Coco's Billingshurst Limited | Other services | 2007 |
| Coco's SW Limited | Extraterritorial | 2008 |
| Coconut Miracle Limited | Wholesale & retail | 2010 |
| Cocoyamy Ltd | Hospitality | 2018 |
| Code Red Distribution Ltd | Professional & scientific | 1988 |
| Coffee Cricketers Limited | Wholesale & retail | 2025 |
| Coffee Merch Ltd | Wholesale & retail | 2026 |
| Coffee Nitro Limited | Manufacturing | 2017 |
| Coffee Zone BH Ltd | Hospitality | 2015 |
| Coffee Zone Gatwick Ltd | Hospitality | 2022 |
| Coffee Zone Global Ltd | Hospitality | 2023 |
| Coffee Zone Limited | Hospitality | 2012 |
| Cogent Construction Consultancy and Services Limited | Professional & scientific | 2016 |
| Cogniporter Ltd | Information & communication | 2018 |
| Cognisant Consultancy Solutions Limited | Professional & scientific | 2019 |
| Collabstart Labs Ltd | Information & communication | 2020 |
| Collingwood Payment Consultants Limited | Information & communication | 2014 |
| Collins & Theresa Oforduru Ltd | Other services | 2024 |
| Collisco Property Maintenance Limited | Households | 2024 |
| Colosseum Dental UK Limited | Health & social care | 2006 |
| Colosseum Dental UK Partnerships II Limited | Health & social care | 2019 |
| Colosseum Dental UK Partnerships Limited | Health & social care | 2010 |
| Colour Data Holdings Limited | Financial services | 2019 |
| Colour Data UK Ltd | Manufacturing | 2005 |
| Colt Trading Limited | Other services | 2017 |
| Comfy Cafe Ltd | Hospitality | 2024 |
| Comfy Homewares Ltd | Wholesale & retail | 2023 |
| Comfy Kitchens Limited | Wholesale & retail | 2025 |
| Commercial Contract Consultancy Limited | Administrative & support | 2025 |
| Commodore 64 Ltd | Wholesale & retail | 2026 |
| Common Good Housing Ltd | Real estate | 2025 |
| Commtel Limited | Manufacturing | 1992 |
| Compare Care Ltd | Health & social care | 2026 |
| Compare Parking Needs Ltd | Transport & logistics | 2017 |
| Comparison Parking Limited | Administrative & support | 2019 |