| Chiron Centres Limited | Health & social care | 1988 |
| Chitcombe Farm Limited | Agriculture & fishing | 2012 |
| Chizoba Ltd | Health & social care | 2022 |
| Choice Support Property Ltd | Real estate | 2024 |
| Choices Rehabs C.I.C. | Health & social care | 2024 |
| Chopstick and Bowl Limited | Hospitality | 2019 |
| Chord Electrical Limited | Extraterritorial | 2003 |
| Chord Engineering Holdings Limited | Financial services | 2023 |
| Chord Engineering Ltd | Construction | 2003 |
| Chord Holdings Limited | Real estate | 1996 |
| Chosen Wisely Limited | Construction | 2020 |
| Chrage Limited | Health & social care | 2011 |
| Chris 2018 Limited | Transport & logistics | 2017 |
| Chris Scott Studios Limited | Information & communication | 2018 |
| Chris Syms Ltd | Construction | 2010 |
| Christ Unique Vision Ltd | Hospitality | 2021 |
| Christie & Cochlin Limited | Wholesale & retail | 2012 |
| Christopherson Property Consultants Limited | Financial services | 2002 |
| Chronicles Building & Consultancy Ltd | Administrative & support | 2017 |
| Chrysalis Care New Generation CIC | Other services | 2020 |
| Chrysalis KEY2KEY Limited | Other services | 2014 |
| Chrysalis Retail Science Limited | Extraterritorial | 2015 |
| Chrysalis Solmotive Limited | Information & communication | 2004 |
| Chrysaliscareathome Limited | Administrative & support | 2012 |
| Church Green Access Road Limited | Real estate | 2007 |
| Church Hill (Kingsnorth) Ltd | Construction | 2022 |
| Church International Limited | Administrative & support | 1984 |
| Church Street (Maidstone) Management Company Limited | Administrative & support | 2008 |
| Church Street (Sunbury) Residents Management Company Limited | Households | 2009 |
| Churchfields (Harrietsham) Management Company Limited | Households | 2018 |
| Chyzhmuso Ltd | Construction | 2026 |
| Ciana Products Ltd | Wholesale & retail | 2020 |
| Cicero Consulting Limited | Professional & scientific | 2000 |
| Cicero Online Limited | Information & communication | 2013 |
| Cidcom Logistics Ltd | Transport & logistics | 2011 |
| Cids International Ltd | Wholesale & retail | 2025 |
| Ciel Azur Limited | Administrative & support | 2015 |
| Cierti Ltd | Administrative & support | 2025 |
| Cinar Cleaning Services Ltd | Administrative & support | 2020 |
| Cinema Acoustic Panel Systems Limited | Other services | 1998 |
| Cinematronics Limited | Information & communication | 2024 |
| Cinime Ltd | Information & communication | 2010 |
| Cinque Sports Limited | Wholesale & retail | 2014 |
| Cinso Limited | Health & social care | 2021 |
| Cip's GAS Heating & Plumbing Limited | Construction | 2026 |
| Cip's Total Systems Limited | Construction | 2014 |
| Circcare Environmental Solutions Ltd | Information & communication | 2026 |
| Circle Mortgages (UK) Limited | Financial services | 2006 |
| Circuit Air Solutions Limited | Construction | 2021 |
| Cit-Tech Limited | Wholesale & retail | 2026 |
| Citadel Education Pathway Ltd | Professional & scientific | 2026 |
| Citihawk Limited | Administrative & support | 2018 |
| Citium Consulting Limited | Professional & scientific | 2024 |
| Citizen Care Connect UK Ltd | Information & communication | 2026 |
| Citizen Care Health Solutions UK Ltd | Information & communication | 2024 |
| City & District Safety Limited | Construction | 2008 |
| City Beacon Support Services Ltd. | Other services | 2009 |
| City Docs Limited | Administrative & support | 2000 |
| City Docs Solutions Limited | Professional & scientific | 2009 |
| City Escalator Services Ltd | Construction | 2017 |
| Citysure Property Services Ltd. | Construction | 2010 |
| Ciurez Ltd | Transport & logistics | 2017 |
| Civicta Consulting Ltd | Information & communication | 2023 |
| Civil Service Club Maidstone Limited | Arts & recreation | 2023 |
| Civil Service Insurance Society(The) | Financial services | 1891 |
| Civils Design Services Ltd | Professional & scientific | 2019 |
| CJ Events Services & Management Ltd | Administrative & support | 2026 |
| CJ Garden Equipment Repairs Ltd | Other services | 2021 |
| CJA Consulting (UK) Limited | Information & communication | 2004 |
| CJC Decorating Ltd | Construction | 2026 |
| CJC Trucking Ltd | Transport & logistics | 2024 |
| CJH Civil ENG Ltd | Construction | 2017 |
| CJL Home Improvements Limited | Construction | 2019 |
| CJT Commercial Consultants Ltd | Professional & scientific | 2026 |
| CJW Properties Ltd | Real estate | 2025 |
| CK Carpentry Ltd | Other services | 2014 |
| CKE Homes Limited | Construction | 2002 |
| CKL Safety Consulting Limited | Professional & scientific | 2024 |
| Cladify Limited | Construction | 2025 |
| Claire Cares Ltd | Health & social care | 2025 |
| Claire Mccarthy Beauty Therapy Ltd | Other services | 2025 |
| Claire Randall Consulting Limited | Professional & scientific | 2011 |
| Claire Randall Limited | Information & communication | 1996 |
| Claire's Days OUT Ltd | Administrative & support | 2023 |
| Clanalisa Properties Limited | Real estate | 2004 |
| Clapa Ltd | Health & social care | 2025 |
| Clara Trans Ltd | Transport & logistics | 2024 |
| Clarabella Smith Interiors Ltd | Manufacturing | 2022 |
| Clarative Accounting Limited | Professional & scientific | 2021 |
| Claremont Communications Ltd | Professional & scientific | 2022 |
| Clarion Property Services Limited | Real estate | 2021 |
| Clarion Rentals Ltd | Real estate | 2026 |
| Clarity Industrial Cleaning Limited | Administrative & support | 2019 |
| Clark Racing Limited | Arts & recreation | 2020 |
| Clarke Consultancy and Psychology Services Ltd | Education | 2025 |
| Clarkebond (UK) Limited | Construction | 2011 |
| Claro Tech Ltd | Information & communication | 2025 |
| Classic Cooling Services Limited | Construction | 2020 |
| Classic Intruder & Fire Systems Ltd | Administrative & support | 2020 |
| Classic Motor Finance Limited | Extraterritorial | 2015 |