| CCR Enterprise Ltd | Professional & scientific | 2026 |
| Ccvm Services Ltd | Transport & logistics | 2025 |
| CD Trans Ltd | Transport & logistics | 2023 |
| CDC Bodyshop Limited | Wholesale & retail | 2016 |
| CDL Transport Ltd | Transport & logistics | 2020 |
| Cdrda Limited | Professional & scientific | 2014 |
| CDS Logistics Consulting Limited | Professional & scientific | 2011 |
| CDV Management Company Limited | Administrative & support | 2025 |
| Ceaa Trans Ltd | Transport & logistics | 2018 |
| Cecconi Construction Ltd | Construction | 2016 |
| Cecconi Investments Ltd | Real estate | 2018 |
| Cecconi Properties Limited | Real estate | 2015 |
| Cecetv Limited | Information & communication | 2014 |
| CED Brickwork Limited | Construction | 2003 |
| Cedar Farm Close (Barham) Management Company Limited | Households | 2022 |
| Cegra IT Limited | Information & communication | 2012 |
| Ceiling Tiles Warehouse Limited | Wholesale & retail | 2026 |
| Celebrate MEN Ltd | Professional & scientific | 2022 |
| Celestial Media Holdings Limited | Professional & scientific | 2024 |
| Celestialcraze Events Ltd | Extraterritorial | 2026 |
| Celestion International Limited | Extraterritorial | 1946 |
| Celia Violet Property Ltd | Real estate | 2024 |
| Cell Exchange Repair Limited | Real estate | 2020 |
| Cellair Limited | Hospitality | 2004 |
| Cellice Ltd | Manufacturing | 2019 |
| Cellsky Limited | Real estate | 2004 |
| Centergem Limited | Wholesale & retail | 2023 |
| Central Creative Academy Ltd | Education | 2021 |
| Central Diamond Services Ltd | Construction | 2006 |
| Central Suffolk Community Energy CIC | Administrative & support | 2024 |
| Centre for Care Limited | Health & social care | 2013 |
| Centre for Digital Disruption Limited | Administrative & support | 2019 |
| Centrefurb Limited | Administrative & support | 1990 |
| Centrinotech Ltd | Information & communication | 2018 |
| Centurae Limited | Health & social care | 2023 |
| Cephas / Alpha Holdings Ltd | Financial services | 2015 |
| Cephas Care Limited | Other services | 2003 |
| Ceramic Tiles Limited | Real estate | 1966 |
| Cerbarus Services Ltd | Construction | 2025 |
| Cerebrum Systems Ltd | Construction | 2016 |
| Ceresgreen Ltd | Information & communication | 2026 |
| Certified Structural Waterproofing Polymers Ltd | Construction | 2019 |
| Cerulean HR Ltd | Professional & scientific | 2026 |
| Cesca Limited | Real estate | 2013 |
| Cetop Limited | Other services | 2026 |
| Cetre Ltd | Information & communication | 2016 |
| Cettire Limited | Information & communication | 2016 |
| CF Network Solutions Ltd | Information & communication | 2021 |
| CF Support Services Limited | Health & social care | 2009 |
| CFA Properties Ltd | Real estate | 2021 |
| CFB Tax Ltd | Professional & scientific | 2025 |
| CFL Inspection Ltd | Other services | 2012 |
| CFR Training Limited | Administrative & support | 2012 |
| CFS East Anglia Ltd | Construction | 2023 |
| CFS Recruitment Ltd | Administrative & support | 2024 |
| CFT Cleaning (EA) Ltd | Administrative & support | 2023 |
| CG & JB Building Services Limited | Construction | 2007 |
| CG Analysts Limited | Financial services | 2010 |
| CG Care Services Ltd | Health & social care | 2020 |
| CG Consulting Engineers Ltd | Professional & scientific | 2025 |
| CG Furniture Ltd | Wholesale & retail | 2018 |
| CG Hadleigh Ltd | Hospitality | 2025 |
| CG Psychology Ltd | Health & social care | 2021 |
| CG Solutions Limited | Wholesale & retail | 2020 |
| CG Web Systems Limited | Information & communication | 2010 |
| CGG Holdings Ltd | Financial services | 2026 |
| CGG Land and Lakes Limited | Real estate | 2025 |
| CGG Land and Property Limited | Real estate | 2021 |
| CGP Studios Limited | Arts & recreation | 2022 |
| Cha-Cha Chargers Ltd | Construction | 2025 |
| Chacko Limited | Construction | 2026 |
| Chahine & Milad Plant & Motors Ltd | Wholesale & retail | 2025 |
| Chai Tea - Agarwal's Kitchen Limited | Hospitality | 2025 |
| Chainbridge Management (EA) Ltd | Households | 2024 |
| Chalkeith Conservation | Other services | 2026 |
| Chalkie and Oreo Limited | Arts & recreation | 2022 |
| Challis & Sons Ltd | Manufacturing | 2009 |
| Challs International Group Limited | Financial services | 2018 |
| Challs International Limited | Wholesale & retail | 1992 |
| Chaman's Rasoi Limited | Hospitality | 2026 |
| Chameleon FD Limited | Professional & scientific | 2011 |
| Chameleon Management Services Ltd. | Wholesale & retail | 2006 |
| Champion Stoves Ltd | Wholesale & retail | 2015 |
| Chan-Jackson Limited | Wholesale & retail | 2025 |
| Chancellor Global Ltd | Administrative & support | 2005 |
| Chandler Court Management Company Limited | Real estate | 2008 |
| Chandlers Care & Recruitment Ltd | Administrative & support | 2023 |
| Changeflow Ltd | Information & communication | 2011 |
| Changing Dialogues Limited | Professional & scientific | 2007 |
| Channel Swimming Association Limited | Arts & recreation | 1999 |
| Chantry Barber Ltd | Other services | 2025 |
| Chantry Barber Shop Ltd | Other services | 2023 |
| Chantry Clearance and Removals Ltd | Transport & logistics | 2026 |
| Chantry FRY Ltd | Hospitality | 2024 |
| Chaos Shenanigans Ltd | Professional & scientific | 2026 |
| Chapel Field Homes Limited | Construction | 2018 |
| Chapel House Consultancy Ltd | Professional & scientific | 2019 |
| Chapel Properties (Woodbridge) Ltd | Construction | 2014 |
| Chaplins Haulage Services Ltd | Transport & logistics | 2018 |
| Chapman Construction London Ltd | Construction | 2025 |