| Care Stone Holdings Limited | Professional & scientific | 2026 |
| Careselect Staffing Ltd | Administrative & support | 2023 |
| Carey Corporate Solutions Ltd | Professional & scientific | 2015 |
| Caribbean Mixup Limited | Hospitality | 2024 |
| Carilifestyle Limited | Administrative & support | 2023 |
| Carmelcrest Homes Ltd | Real estate | 2016 |
| Carmelcrest Limited | Construction | 1983 |
| Carmo Cleaning Services Ltd | Administrative & support | 2025 |
| Carseat Ninja Ltd | Wholesale & retail | 2020 |
| Carter and Hill Consulting Limited | Professional & scientific | 2025 |
| Carter Art Services Ltd | Other services | 2025 |
| Carter Hawkins Limited | Professional & scientific | 2009 |
| Carter Jace Properties Limited | Real estate | 2022 |
| Casa Colby Limited | Real estate | 2016 |
| Casa Maria Ltd | Real estate | 2019 |
| Casa Munir Ltd | Wholesale & retail | 2025 |
| Casa Rosa Management Ltd | Professional & scientific | 2023 |
| Cascade Services Ltd | Administrative & support | 2022 |
| Cashdash UK Limited | Information & communication | 2016 |
| Caslake Consulting Ltd | Professional & scientific | 2019 |
| Cassan Ltd | Real estate | 2019 |
| Cassels Consulting Limited | Other services | 2011 |
| Casson Holdings Ltd | Information & communication | 2019 |
| Castanhos Limited | Wholesale & retail | 2009 |
| Castle Court (Bishop's Stortford) Limited | Real estate | 2013 |
| Castle Espie Consulting Limited | Professional & scientific | 2018 |
| Castle Wren Contracting Ltd | Construction | 2024 |
| Castle Wren Group Ltd | Professional & scientific | 2024 |
| Castle Wren Ltd | Construction | 2022 |
| Catalyst Advisors Limited | Professional & scientific | 2022 |
| Catering Consultancy Bureau Limited | Hospitality | 2002 |
| Cath's Wrap Around Childcare Ltd | Health & social care | 2023 |
| Cathedral Funeral Services (ELY) Limited | Extraterritorial | 1997 |
| Catmando Consulting Limited | Professional & scientific | 2022 |
| CB Freehold Services Limited | Other services | 2008 |
| CB IAD Ltd | Real estate | 2023 |
| CB Site Engineering Ltd | Construction | 2023 |
| CBS Assets Ltd | Real estate | 2024 |
| CBT Corporation Ltd | Financial services | 2023 |
| CC Engineering Ltd | Manufacturing | 2025 |
| CC House Design Ltd | Professional & scientific | 2024 |
| CC Property Consultancy Ltd | Professional & scientific | 2015 |
| CC Protection Limited | Financial services | 2019 |
| CCW Grantchester Limited | Hospitality | 2016 |
| CCW Investment Holdings Limited | Financial services | 2019 |
| CCW London Properties Limited | Real estate | 2016 |
| CCW Properties Limited | Real estate | 2019 |
| CCW Rental Investments Limited | Real estate | 2016 |
| Cd-Si Solutions Ltd | Information & communication | 2025 |
| CDH Plumbing Ltd | Construction | 2023 |
| Cedar Court (B.S) Management Company Limited | Households | 2010 |
| Cedar Creek INK Ltd | Other services | 2025 |
| Cedarbuild Ltd | Real estate | 2025 |
| Cedarhut Properties Limited | Real estate | 2024 |
| Celo Baba Ltd | Hospitality | 2022 |
| Celtic Calligraphy Limited | Arts & recreation | 2021 |
| Celtic Design and Engineering Limited | Professional & scientific | 2021 |
| Cemer Associates Limited | Professional & scientific | 2013 |
| Cemer Enterprises Limited | Professional & scientific | 2001 |
| Central Shipping and Trading Ltd | Transport & logistics | 2021 |
| Cetab Limited | Information & communication | 2011 |
| Cevm Ltd | Professional & scientific | 2021 |
| CFM Cleaning Ltd. | Administrative & support | 2026 |
| CG 24/7 Commercial Services Ltd | Wholesale & retail | 2014 |
| CG Digital Consultancy Ltd | Professional & scientific | 2025 |
| CG Search Limited | Information & communication | 2021 |
| Cgbg Consulting Ltd | Professional & scientific | 2026 |
| CGC London Limited | Construction | 2024 |
| CGF Electrical Limited | Construction | 2019 |
| Cglifetime Ltd | Real estate | 2022 |
| Ch-Entertainment Ltd | Professional & scientific | 2021 |
| CH1MANAGEMENT Ltd | Health & social care | 2022 |
| Chalk Property Ltd | Real estate | 2025 |
| Chalkley Scaffolding Ltd | Construction | 2022 |
| Chalks Farm Management Limited | Real estate | 1982 |
| Chalks Property Ltd | Construction | 2018 |
| Change Property Ltd | Real estate | 2023 |
| Changes Landscapes Limited | Administrative & support | 2013 |
| Chantry & Co Surveyors Ltd | Professional & scientific | 2019 |
| Chantry Associates Limited | Professional & scientific | 2014 |
| Chapel Fields Management Company Limited | Real estate | 2007 |
| Chapter 10 Media Limited | Professional & scientific | 2022 |
| Chaptrdesign Ltd | Construction | 2022 |
| Charco Computers Limited | Information & communication | 2025 |
| Charles Vivian Ltd | Manufacturing | 2020 |
| Charles Wealth Management Ltd | Financial services | 2019 |
| Charlespar Ltd | Real estate | 1993 |
| Charlie Brown Properties Ltd | Real estate | 2023 |
| Charlie James Ltd | Wholesale & retail | 2025 |
| Charlie Pace Aesthetics Ltd Limited | Other services | 2024 |
| Charsek Limited | Health & social care | 2023 |
| Chartermaze Management Limited | Real estate | 2004 |
| Chartfield Property Management Ltd | Real estate | 2023 |
| Chelmsford and Essex Properties Limited | Real estate | 2021 |
| Chelmsford Building Services Limited | Construction | 2003 |
| Chemiera Ltd | Other services | 2023 |
| Cherry Tree Farm Developments Ltd | Real estate | 2025 |
| Cheshunt Chateau Cafe Ltd | Hospitality | 2015 |
| Chezabelle Brows & Lash Bar Limited | Other services | 2020 |
| CHG Manufacturing Limited | Manufacturing | 2025 |