| Cherish Consulting Limited | Professional & scientific | 2023 |
| Cheriton Catering Ltd | Hospitality | 2019 |
| Cherry Capital Holdings Limited | Real estate | 2017 |
| Cherry Kent Limited | Real estate | 2021 |
| Cherry Lending Property Subsidiary 1 Ltd | Financial services | 2016 |
| Cherrycot Park Limited | Real estate | 1991 |
| Cherrymist Services Limited | Real estate | 2002 |
| Chester Pest Control Ltd | Other services | 2021 |
| Chestnut Design & Build Ltd | Construction | 2022 |
| Chez Executive Ltd | Hospitality | 1986 |
| Chfr Group Ltd | Transport & logistics | 2025 |
| Chichi Consultancy Services Limited | Health & social care | 2013 |
| Chigment Limited | Real estate | 1975 |
| Child and Adolescent Psychology and Empowerment Service (Capes) Limited | Education | 2020 |
| Chilitown Limited | Hospitality | 2025 |
| Chiltern Restoration Ltd | Construction | 2016 |
| Chimel Afro Caribbean Foods Ltd | Manufacturing | 2025 |
| China Everbright Limited | Real estate | 2003 |
| Chinalink (London) Ltd | Administrative & support | 2014 |
| Chinuk Union Ltd | Real estate | 2020 |
| Chipperfield Road 1965 Limited | Extraterritorial | 2014 |
| Chislehurst GIN Company Limited | Wholesale & retail | 2020 |
| Chislehurst Homecare Partnership Limited | Health & social care | 2001 |
| Cholij Accounting Limited | Professional & scientific | 2000 |
| Chopade & Jadhav Properties Ltd | Real estate | 2026 |
| Chopsticks (Kent) Ltd | Hospitality | 2015 |
| Chordis Capital Limited | Financial services | 2020 |
| Chowdownco Ltd | Hospitality | 2024 |
| Chris J Media Limited | Information & communication | 2012 |
| Christ the Redeemer Catholic Education Trust | Education | 2023 |
| Christchurch Nursery School (Folkestone) Limited | Education | 1999 |
| Christian Mulcahy Ltd | Professional & scientific | 2025 |
| Christine Johnson Ltd | Administrative & support | 2016 |
| Christopher David Martin | Financial services | 2009 |
| Chroma Projects Ltd | Information & communication | 2015 |
| Chroma Property Management Ltd | Real estate | 2016 |
| Chudoc Services Ltd | Health & social care | 2015 |
| Cida Innovations Ltd | Wholesale & retail | 2025 |
| Citadel Prime Holdings Ltd | Real estate | 2024 |
| Citadel Prime Properties Ltd | Real estate | 2024 |
| Cittacore Technologies UK Ltd | Information & communication | 2022 |
| City Bookkeepers Ltd | Professional & scientific | 2012 |
| City Financial Trust Limited | Professional & scientific | 1988 |
| City Teck Limited | Construction | 2001 |
| Ciuk Asset Management Ltd | Real estate | 2015 |
| Ciuk ST Mary Cray Ltd | Real estate | 2017 |
| Civi-Ling UK Limited | Administrative & support | 2010 |
| Civitek Developments Ltd | Construction | 2020 |
| CJ Roofing & Property Maintenance Ltd | Construction | 2020 |
| Cjgregory Ltd | Construction | 2009 |
| CJL Maintenance Ltd | Households | 2026 |
| CK Deaf Inclusion CIC | Education | 2026 |
| CK Glow Aesthetics London Ltd | Other services | 2024 |
| CKB Design and Build Limited | Professional & scientific | 2016 |
| CKB Group Limited | Financial services | 2016 |
| CKB Trailers Limited | Manufacturing | 2016 |
| Ckma Services Limited | Health & social care | 2023 |
| CKP Accounting Ltd | Professional & scientific | 2021 |
| CL Iproperties Limited | Real estate | 2016 |
| Clacton Holdings Limited | Professional & scientific | 2023 |
| Clairvoyance Actuarial Ltd | Financial services | 2014 |
| Clairvoyance Ltd | Information & communication | 2014 |
| Clan Works LLP | | 2020 |
| Clapham Developments London Ltd | Construction | 2011 |
| Clarendon Court (Beckenham) Management Limited | Households | 1987 |
| Clareville Road Residents Society Limited | Other services | 1978 |
| Clarewood Property Holdings Limited | Real estate | 2026 |
| Clarion Properties Limited | Wholesale & retail | 1961 |
| Clariot Limited | Health & social care | 2010 |
| Clarity Design & Construction Ltd | Construction | 2022 |
| Clarks (Petts Wood) Limited | Wholesale & retail | 2017 |
| Clarks Furniture Limited | Wholesale & retail | 2016 |
| Clarkson Wright & Jakes Limited | Professional & scientific | 2011 |
| Clarkson Wright & Jakes Notaries LLP | | 2017 |
| Clarkson Wright & Jakes Services LLP | | 2011 |
| Classic & Vintage Limited | Extraterritorial | 2019 |
| Classic Consultancy Limited | Professional & scientific | 2011 |
| Classical & Bayesian Solutions Limited | Professional & scientific | 1996 |
| Clau Cleaning Services Limited | Administrative & support | 2025 |
| CLB Group Ltd | Administrative & support | 2025 |
| CLC Utility Holdings Limited | Professional & scientific | 2022 |
| Clean & Greens SS Ltd | Administrative & support | 2025 |
| Cleaner Products Limited | Administrative & support | 2008 |
| Cleanspec Solution Ltd | Information & communication | 2017 |
| Cleantique Ltd | Administrative & support | 2025 |
| Clear Future Energy Ltd | Construction | 2025 |
| Clearchance Property Management Limited | Administrative & support | 1994 |
| Clearoak Limited | Financial services | 2025 |
| Clearwater House Limited | Households | 2013 |
| Cleatlam Ltd | Wholesale & retail | 2020 |
| Cleave Express Ltd | Wholesale & retail | 2026 |
| Cleaver Electrical (UK) Ltd | Administrative & support | 2011 |
| Cleaver Electrical Solutions Ltd | Construction | 2014 |
| Clever Minds Academy Limited | Education | 2019 |
| CLG Herne Hill Ltd | Construction | 2023 |
| CLG Horley Ltd | Construction | 2023 |
| Clifton House (Freehold) Ltd | Households | 2021 |
| Clinic Consults Ltd | Professional & scientific | 2019 |
| Clinical Reporting Services Ltd | Health & social care | 2024 |
| Clinical Staff Relief Ltd | Health & social care | 2023 |