| Care at Home Services (South East) Limited | Health & social care | 2004 |
| CARECREW24 Ltd | Administrative & support | 2024 |
| Carey Anaesthetic Services Limited | Health & social care | 2022 |
| Carey Property Management Ltd | Real estate | 2021 |
| Carimjim Limited | Administrative & support | 2013 |
| Carina Acoustic Solutions Ltd | Construction | 2022 |
| Caring for YOU PTS Limited | Transport & logistics | 1995 |
| Carlos Gris Studio Ltd | Professional & scientific | 2014 |
| Carman Coaching Limited | Health & social care | 2014 |
| Carnegie London Ltd | Construction | 2015 |
| Carocom Limited | Administrative & support | 2008 |
| Carok Services Limited | Professional & scientific | 2017 |
| Carol Tsang Limited | Health & social care | 2002 |
| Carrowgarve Property Limited | Real estate | 2024 |
| Carter House (Calverley Park Gardens) Limited | Real estate | 2022 |
| Carter House Amenity Limited | Households | 2015 |
| Carter Munro Associates Limited | Professional & scientific | 2025 |
| Cartiers DRY Cleaning Limited | Administrative & support | 2009 |
| Casa DE Madeira Ltd | Hospitality | 2012 |
| Cascade Cleaning Services Limited | Administrative & support | 2015 |
| Caseco Limited | Wholesale & retail | 2021 |
| Cass Construction Company (Kent) Limited | Construction | 1969 |
| Cassandra & Ernesto Ltd | Information & communication | 2020 |
| Cast London Ltd | Administrative & support | 2024 |
| Castaway Reef Limited | Wholesale & retail | 2025 |
| Castle View III Management Company (Tonbridge) Limited | Real estate | 2002 |
| Castleridge Property Management Limited | Households | 1993 |
| Castleton Properties Limited | Households | 1987 |
| Castletown One Limited | Construction | 2018 |
| Catalyst Networks Limited | Professional & scientific | 2002 |
| Caterham Chiropractic Limited | Health & social care | 2014 |
| Cathair Dhubh Ltd | Hospitality | 2018 |
| Catherine DE Crevecoeur Ltd | Manufacturing | 2023 |
| Catherine House Property Management Limited | Real estate | 2020 |
| Catkin Gardens Limited | Administrative & support | 2018 |
| Cats Whiskers 1988 Limited | Agriculture & fishing | 2022 |
| Cauchy & Limited | Hospitality | 2025 |
| Causeway Joinery Limited | Manufacturing | 2002 |
| Cave Worldwide Limited | Extraterritorial | 2004 |
| Caxton Homes Limited | Real estate | 2004 |
| CB Trustees Limited | Administrative & support | 2003 |
| Cben & Partners Accountants Limited | Professional & scientific | 2024 |
| Cbks Holdings Limited | Construction | 2025 |
| CBL Decorators Limited | Construction | 2021 |
| CBR Global Ltd | Wholesale & retail | 2023 |
| CBT in Partnership Ltd | Health & social care | 2019 |
| CBW Holdings Limited | Professional & scientific | 2017 |
| CCP Estimating Support Services Ltd | Professional & scientific | 2026 |
| CD Media Training Ltd | Education | 2005 |
| CDS Rose Limited | Water & waste | 2009 |
| CDV Plumbing Limited | Construction | 2012 |
| Cecc Ltd | Professional & scientific | 2025 |
| Cedar Court (Tunbridge Wells) RTM Company Limited | Households | 2013 |
| Cedar Court Association Limited | Real estate | 1982 |
| Cedar Lodge Freehold Company Limited | Professional & scientific | 1996 |
| Cedars (Freehold) Company Limited | Households | 2021 |
| Cedars 90A Limited | Households | 2007 |
| Ceecee Nail Bar Limited | Other services | 2019 |
| Ceegas Limited | Professional & scientific | 2010 |
| Celebrating English Unification Limited | Other services | 2025 |
| Celebrity Circus Limited | Information & communication | 2024 |
| Celestial Touch Ltd | Other services | 2025 |
| Celestique Investments Ltd | Wholesale & retail | 2026 |
| Celtic Investment Management Ltd | Professional & scientific | 2017 |
| Celtic Phenomena Ltd | Health & social care | 2022 |
| Centinel 10 Ltd | Financial services | 2019 |
| Central London Critical Care Group LLP | | 2022 |
| Centricity Global Ltd | Other services | 2024 |
| Cereus Ltd | Real estate | 2022 |
| Certainty PSC Limited | Administrative & support | 2014 |
| Certus Consulting Ltd | Professional & scientific | 2025 |
| CH 2004 Management Ltd | Real estate | 2004 |
| CH Bookkeeping Ltd | Professional & scientific | 2023 |
| CH Mulgrave Developments Limited | Construction | 2026 |
| Chadha Analytics Limited | Information & communication | 2003 |
| Chadha Lettings Ltd | Real estate | 2022 |
| Chafford Arms Ltd | Hospitality | 2006 |
| Chafford Bridge Residents' Association Limited(The) | Real estate | 1982 |
| Chalins Building Limited | Construction | 2015 |
| Chalk Circle Limited | Information & communication | 2010 |
| Chalklin Business Park Management Limited | Households | 1991 |
| Chalybeate Construction Ltd | Construction | 2022 |
| Chalybeate Property Ltd | Real estate | 2013 |
| Champs Teknoloji UK Limited | Information & communication | 2025 |
| Chancellor House Freehold Limited | Households | 1998 |
| Change Brands Limited | Professional & scientific | 2022 |
| Change Business Finance Limited | Financial services | 2012 |
| Changex Limited | Information & communication | 2023 |
| Changra KIT Limited | Wholesale & retail | 2023 |
| Chapel Hair & Spa Group Limited | Professional & scientific | 2010 |
| Chapel Hair & Spa Sevenoaks Limited | Other services | 2010 |
| Chapel Hair Management Limited | Professional & scientific | 2010 |
| Chapel Repro Limited | Manufacturing | 1990 |
| Chapmans Mews Management Company Limited | Households | 2019 |
| Chapter One Group Ltd | Professional & scientific | 2014 |
| Charalle Consulting Limited | Administrative & support | 2016 |
| Charcoalgrill TW Limited | Hospitality | 2026 |
| Charles Foster Kane Limited | Other services | 2003 |
| Charles Gillespie Architecture Limited | Professional & scientific | 2021 |
| Charlie Firth Ltd | Information & communication | 2022 |