| Charlwood Designs Limited | Professional & scientific | 1976 |
| Charlwood Landscape Limited | Construction | 2003 |
| Chartered Press Limited | Manufacturing | 1986 |
| Chasam Equine Services Limited | Arts & recreation | 2005 |
| Chase Heat Ltd | Construction | 2026 |
| Chatfield Cleaning and Maintenance Limited | Extraterritorial | 2004 |
| Chatfield Cleaning Limited | Administrative & support | 2000 |
| Chatham Cafe Ltd | Hospitality | 2022 |
| Chell Services Limited | Professional & scientific | 1989 |
| Chelsea Vault Ltd | Manufacturing | 2025 |
| Chelsfield Associates Limited | Professional & scientific | 2006 |
| Chelsfield Consulting Limited | Professional & scientific | 2002 |
| Chequered Flag (Smart) Limited | Wholesale & retail | 2006 |
| Cherry Tree Nursery GB Ltd | Education | 2007 |
| Chess Rook Property Ltd | Real estate | 2017 |
| Cheverst Knight & Company Limited | | 1982 |
| Chicken Pizza Station Ltd | Hospitality | 2021 |
| Chikhalia & Co Limited | Professional & scientific | 2002 |
| Chiki Design Limited | Wholesale & retail | 2007 |
| Chilli Chill Limited | Hospitality | 2023 |
| Chinstrap Ventures Limited | Financial services | 2007 |
| Chipnick Ltd | Health & social care | 2011 |
| Chislehurst Golf Club Limited | Arts & recreation | 1898 |
| Chislehurst Motormowers Limited | Other services | 2002 |
| Chislehurst YFC Limited | Health & social care | 2007 |
| Chloe Nails Asfhord Ltd | Other services | 2024 |
| Choice Property Developments Ltd | Construction | 2022 |
| Choice Property Group (UK) Ltd | Administrative & support | 2022 |
| Choicestance Property Management Limited | Households | 1995 |
| Chris HAM Ltd | Construction | 2007 |
| Chris Hayward Powered by EXP Limited | Real estate | 2024 |
| Chris Jefferys Creative Limited | Professional & scientific | 2017 |
| Christ Faith Media Limited | Information & communication | 2007 |
| Christie & Grey Limited | Professional & scientific | 1914 |
| Chrobis Concepts UK Ltd | Real estate | 2016 |
| CHS Networks Limited | Information & communication | 1998 |
| Church Mouse Studio Limited | Arts & recreation | 2003 |
| Churchfields Bloodstock Limited | Professional & scientific | 2001 |
| Churchfields Road BR3 Limited | Construction | 2015 |
| Churchill House School of English Language Limited | Education | 1971 |
| Churchmount Limited | Wholesale & retail | 2004 |
| Churchview Land Ltd | Construction | 2018 |
| Churst Limited | Real estate | 2001 |
| CIJ Realty Ltd | Extraterritorial | 2025 |
| Cinders Plumbing and Heating Limited | Construction | 2006 |
| Cinnamon Spice Ashford Ltd | Hospitality | 2021 |
| Cinnamon Spice Kent Ltd | Hospitality | 2019 |
| Circulo Consulting Limited | Information & communication | 2007 |
| Cirius Technical Limited | Information & communication | 2003 |
| Cirrologic Limited | Information & communication | 1997 |
| Citicare Limited | Wholesale & retail | 2020 |
| Citipost Power Limited | Wholesale & retail | 2020 |
| Citizens Advice North East Kent | Health & social care | 1990 |
| City Lofts & J.C.S. Developments Limited | Construction | 2007 |
| City Medical UK Ltd | Health & social care | 2005 |
| Citygate Christian Outreach Centre | Other services | 2005 |
| Citywall Associates Limited | Information & communication | 2000 |
| CKP Accountancy Services Ltd | Professional & scientific | 2003 |
| Claire Douglas Styling Ltd | Professional & scientific | 2025 |
| Claraworldmedia Group Limited | Wholesale & retail | 2017 |
| Clarity Core Cleaning Ltd | Other services | 2026 |
| Clark and Company (South East) Limited | Professional & scientific | 2005 |
| Clark Marshall Associates Ltd | Financial services | 1996 |
| Clark's Door & Window Maintenance Limited | Construction | 1976 |
| Clarkes Funeral Services Limited | Professional & scientific | 1999 |
| Clarrington & Co Limited | Construction | 2001 |
| Class 52 Music Limited | Administrative & support | 1986 |
| Clearsightpartners Limited | Information & communication | 2005 |
| Clearwater Consultants Limited | Information & communication | 2005 |
| Cleat Limited | Construction | 2002 |
| Cleverley & Spencer Limited | Professional & scientific | 2002 |
| Cliffe Studio Limited | Professional & scientific | 2016 |
| Cliffpoint Limited | Transport & logistics | 1987 |
| Clive Jones Carpentry Limited | Construction | 2020 |
| Cliveden Estates (South East) Limited | Real estate | 2001 |
| Cloke Scaffolding Limited | Construction | 2007 |
| Cloudace Limited | | 1985 |
| Cloudscale Limited | Other services | 1984 |
| Clouter Services Limited | Other services | 1997 |
| Clover Fashions Limited | | 1991 |
| Club-K Ltd | Information & communication | 2026 |
| Clubgear UK Limited | Wholesale & retail | 2003 |
| Clubteam Computers Limited | Information & communication | 1993 |
| Clutch International (Properties) Limited | Real estate | 1994 |
| CNW Engineering Limited | Wholesale & retail | 2006 |
| Co-Check Limited | Professional & scientific | 2007 |
| Coachwork Renovations Limited | Wholesale & retail | 1998 |
| Coady Phillips Limited | Real estate | 1989 |
| Coastal Building Developments Limited | Construction | 2005 |
| Codix Wellness (UK) Limited | Wholesale & retail | 2025 |
| Coldwave Programs Limited | Information & communication | 1995 |
| Coles & Co. | | 1995 |
| Coleway (Building Contractors) Limited | | 1976 |
| Colin Jones (Computer Consultancy) Ltd | Information & communication | 1995 |
| College of Hair and Beauty Limited(The) | | 1982 |
| Collier Stevens Consulting Ltd | Professional & scientific | 2003 |
| Collingwood Farm Limited | Agriculture & fishing | 1958 |
| Collins (Contractors) Limited | Construction | 1929 |
| Collins Ladywell Limited | Financial services | 2018 |
| Colonel Stephens Railway Enterprises Limited | Transport & logistics | 1991 |