| Crestwood Property Solutions Ltd | Real estate | 2013 |
| Crestwood Stays Ltd | Hospitality | 2026 |
| CRESTWOODINV1 Ltd | Real estate | 2024 |
| Crichton & Co Ltd | Professional & scientific | 2012 |
| Crimson Industrial Vision Ltd | Wholesale & retail | 2010 |
| Crimson Tide Mpro Limited | Information & communication | 1994 |
| Crimson Tide PLC | Professional & scientific | 1911 |
| Crimson Tide Services Limited | Information & communication | 2006 |
| Cripps Consulting Ltd | Information & communication | 2017 |
| Cripps LLP | | 2005 |
| Cripps Secretaries Limited | Administrative & support | 1991 |
| Cripps Trust Corporation Limited | Administrative & support | 1998 |
| Cripps Trustees Limited | Administrative & support | 1990 |
| Crisp Plumbing & Heating LLP | | 2023 |
| Crispin Timber Limited | Wholesale & retail | 2019 |
| Crissvic Trading Ltd | Wholesale & retail | 2016 |
| CRL Recovery Ltd | Water & waste | 2024 |
| Croc Waste Ltd | Water & waste | 2014 |
| Croftice Limited | Construction | 1987 |
| Crolytics Ltd | Information & communication | 2021 |
| Croome Heritage Trust | Arts & recreation | 2004 |
| Cross Keys Tunbridge Wells Ltd | Hospitality | 2023 |
| Crossbow Advisory Ltd | Professional & scientific | 2023 |
| Crossbow Capital Limited | Financial services | 2011 |
| Crossfit Tonbridge Ltd | Arts & recreation | 2019 |
| Crossfit Tunbridge Wells Ltd | Arts & recreation | 2021 |
| Crossleigh Court (New Cross) RTM Company Limited | Households | 2013 |
| Crossways Community | Health & social care | 1991 |
| Crossways Community Enterprises Limited | Health & social care | 2013 |
| Crowborough Croft Lodge Limited | Households | 1984 |
| Crowborough Optometry Ltd | Wholesale & retail | 2022 |
| Crowhurst Park Holdings Limited | Hospitality | 2023 |
| Crowhurst Park Limited | Hospitality | 2021 |
| Crown House Lamberhurst Property Management Limited | Professional & scientific | 2000 |
| Crowntrade UK Ltd | Wholesale & retail | 2025 |
| Cruative Ltd | Information & communication | 2017 |
| Crundall's Fruit Farms Limited | Professional & scientific | 1947 |
| Crux London Ltd | Extraterritorial | 2014 |
| CS Hub Limited | Health & social care | 2023 |
| CS Installs Ltd | Construction | 2025 |
| CS Taccounting Ltd | Professional & scientific | 2026 |
| CSF Limited | Arts & recreation | 2012 |
| CSL Retail Ltd | Wholesale & retail | 2021 |
| Csms Property Limited | Real estate | 2020 |
| CTA Consultancy Limited | Professional & scientific | 2013 |
| CTG Travel Technologies Ltd | Information & communication | 2019 |
| CTN Fast Food Limited | Hospitality | 2024 |
| Ctnicholas Ltd | Information & communication | 2022 |
| Ctrl-P Solutions Ltd | Administrative & support | 2020 |
| CTT Group Ltd | Extraterritorial | 2016 |
| CTW Pump Room CIC | Arts & recreation | 2025 |
| Cubbon Ltd | Professional & scientific | 2015 |
| Cubex Industries Ltd | Manufacturing | 2019 |
| Cubic Engineering Services Limited | Professional & scientific | 2006 |
| Culfin Investments Ltd | Financial services | 2018 |
| Cult Gaia Limited | Wholesale & retail | 2024 |
| Cultural Awareness and Diversity Company Ltd | Professional & scientific | 2010 |
| Culverden Design and Build Limited | Construction | 2026 |
| Culverden Down JV Ltd | Real estate | 2026 |
| Culverden Park Road Management Limited | Households | 2007 |
| Culverden Square Residents Association Limited | Households | 2023 |
| Culverden Tutors Ltd | Education | 2019 |
| Cumberland Park Management Company Limited | Households | 1998 |
| Curiosity Solutions Ltd | Information & communication | 2016 |
| Curious Bots Limited | Information & communication | 2026 |
| Curious Family Investments Limited | Real estate | 2021 |
| Curiouser Minds Limited | Information & communication | 2021 |
| Current Affairs Building Services Limited | Manufacturing | 2011 |
| Current Affairs Electrical Contractors Limited | Construction | 1993 |
| Current Affairs EOT Limited | Administrative & support | 2023 |
| Curry Taste Ltd | Hospitality | 2019 |
| Curve Garden Rooms Ltd | Construction | 2017 |
| Curve Interactive Limited | Administrative & support | 2007 |
| Custom Design Group Ltd | Construction | 2022 |
| Custom Plots Limited | Real estate | 2021 |
| CUT IT OUT (Editing) Ltd | Information & communication | 2011 |
| CUT Top Limited | Other services | 2025 |
| Cutdown Limited | Administrative & support | 2015 |
| Cuxton (Medway Gate) Management Company Limited | Households | 2007 |
| CVG Family Law Ltd | Professional & scientific | 2023 |
| CW Energy LLP | | 2009 |
| CWF Solutions Ltd | Construction | 2019 |
| CXT Ltd. | Information & communication | 2015 |
| Cyber Security International (CSI) Ltd | Information & communication | 2018 |
| Cybercus Ltd | Information & communication | 2026 |
| Cyberguardz Limited | Information & communication | 2024 |
| Cyberhosters Ltd | Information & communication | 2021 |
| Cybersec Innovation Partners Ltd | Administrative & support | 2018 |
| Cypher Works Limited | Information & communication | 2024 |
| D & E Hughes Properties Limited | Real estate | 2017 |
| D & R Hall Investments Limited | Real estate | 2018 |
| D & Y Consultancy Ltd | Information & communication | 2021 |
| D C Massey Ltd | Administrative & support | 2020 |
| D Fraser Projects Ltd | Administrative & support | 2020 |
| D J & F Clark & Co Holdings Limited | Financial services | 2024 |
| D J Kent Limited | Hospitality | 2005 |
| D Obbard & Sons (Trading) Limited | Agriculture & fishing | 1997 |
| D P Controls Limited | Construction | 2001 |
| D Robinson Track Specialist Ltd | Construction | 2014 |
| D Simpson Builders Limited | Construction | 2002 |