| CARESTAFF24 Ltd | Administrative & support | 2021 |
| Carillon Millor Ltd | Professional & scientific | 2000 |
| Carma Caffeine Ltd | Administrative & support | 2024 |
| Carmel Healthcare Ltd | Administrative & support | 2018 |
| Carmen’S Hair and Beauty Ltd | Other services | 2023 |
| Carnot Consult Limited | Manufacturing | 2013 |
| Carnvale Ltd | Other services | 1995 |
| Caroline MEE Creative Limited | Professional & scientific | 2025 |
| Carosa Limited | Transport & logistics | 2003 |
| Carousel Management Limited | Administrative & support | 2018 |
| Carp Fishing Holidays Ltd | Administrative & support | 2026 |
| Carpe Candles Ltd | Wholesale & retail | 2025 |
| Carpenters Arms Apartments RTM Company Limited | Households | 2018 |
| Carpenters Mate Limited | Extraterritorial | 2007 |
| Carpers Journal Ltd | Agriculture & fishing | 2025 |
| Carpet Depot Limited | Wholesale & retail | 2005 |
| Carpet Giant London Limited | Wholesale & retail | 2006 |
| Carpet Giant Ltd | Wholesale & retail | 2006 |
| Carpet Mills (Kent) Limited | Wholesale & retail | 2025 |
| Carpet Professional Limited | Administrative & support | 2021 |
| Carpets 4 ALL Limited | Wholesale & retail | 2004 |
| Carriage House Interiors Ltd | Construction | 2024 |
| Carrigshaun Management Limited | Real estate | 2000 |
| Carsal 2009 Limited | Administrative & support | 2009 |
| Carters Funerals Limited | Other services | 2025 |
| Cartoon Production Ltd | Wholesale & retail | 2020 |
| Caruchi Ltd | Health & social care | 2018 |
| CARZ4LESS Ltd | Wholesale & retail | 2015 |
| Casadecor Limited | Construction | 2025 |
| Cascade Dance LLP | | 2011 |
| Casemood Ltd | Wholesale & retail | 2025 |
| Caspar Building and Developments Ltd | Construction | 2015 |
| Casper Commercial Ltd | Administrative & support | 2025 |
| Cass Court Management Company Limited | Real estate | 2008 |
| Cassemnova Properties Limited | Real estate | 2021 |
| Cast a Thought CIC | Education | 2022 |
| Castacrete Limited | Manufacturing | 1966 |
| Castello Developments Ltd | Real estate | 2021 |
| Castello Group Ltd | Real estate | 2019 |
| Castille Estates LLP | | 2013 |
| Castle Cleaning Services Kent Ltd | Administrative & support | 2017 |
| Castle Farm Limited | Agriculture & fishing | 2006 |
| Castle Financial Services (South East) Limited | Financial services | 2006 |
| Castle Portable LOO Hire Ltd | Other services | 2020 |
| Castlerock International Limited | Real estate | 2018 |
| Castor Park Management Limited | Households | 2017 |
| Casual Football Limited | Arts & recreation | 2024 |
| Cat Components (Hastings) Limited | Real estate | 1994 |
| Cat Goalkeeping Products Ltd | Manufacturing | 2022 |
| Caterkool Limited | Manufacturing | 2023 |
| Catford Hill Freehold Company Limited | Households | 2018 |
| Cathy Featherstone Ltd | Professional & scientific | 2014 |
| Cavalier Security Limited | Administrative & support | 2024 |
| Cavendish Orwell Media Services Ltd | Financial services | 2023 |
| Cavill Cheers Limited | Hospitality | 2024 |
| Cavity Clean Ltd | Professional & scientific | 2015 |
| Cavity Wall TIE Replacement Kent Ltd | Construction | 2021 |
| CAW Carpentry Ltd | Construction | 2026 |
| Cawston Surveying Limited | Professional & scientific | 2008 |
| Cayser Water Systems Ltd | Water & waste | 2026 |
| CB Aesthetics Bearsted Ltd | Other services | 2021 |
| CB Beauty Ltd | Other services | 2023 |
| CB Cladding Ltd | Construction | 2015 |
| CB Redevelopments Limited | Real estate | 2024 |
| CBD Doctor Club Ltd | Wholesale & retail | 2019 |
| CBS Online Limited | Wholesale & retail | 2012 |
| CC & CG Logistics Limited | Transport & logistics | 2021 |
| CC & CG Merchandise UK Limited | Wholesale & retail | 2020 |
| CC Education Consultancy Ltd | Education | 2024 |
| CC Lets Ltd | Real estate | 2025 |
| Cccm Holdings Ltd | Other services | 2015 |
| CCV Electrical Limited | Construction | 2018 |
| CDB Logistic Ltd | Transport & logistics | 2023 |
| CDP Ventures Limited | Real estate | 2023 |
| CDT Carpentry Ltd | Construction | 2020 |
| CE Yildiz Ltd | Professional & scientific | 2024 |
| CEB Heating Ltd | Other services | 2022 |
| Cebith Limited | Construction | 2009 |
| CEC Partnership Group Ltd | Real estate | 2024 |
| CEE PR Ltd | Professional & scientific | 2019 |
| Ceeren Properties Ltd | Real estate | 2026 |
| CEJ Holding Limited | Financial services | 2025 |
| Celebrate Families C.I.C. | Hospitality | 2025 |
| Celebrities Worldwide Ltd | Information & communication | 2000 |
| Celebro Live Ltd | Information & communication | 2017 |
| Celebtime Limited | Arts & recreation | 2007 |
| Celi Films Limited | Information & communication | 1998 |
| Cell FIX IT Ltd | Wholesale & retail | 2017 |
| Cell Projects Limited | Manufacturing | 2002 |
| Cellar-Tech Services Ltd | Construction | 2009 |
| Celltek Furniture Systems Limited | | 1986 |
| Celsius Plumbing & Heating Limited | Construction | 2017 |
| Celtic Property Services Limited | Hospitality | 1997 |
| Cemcan Property Limited | Real estate | 2014 |
| Cementlaw Limited | Professional & scientific | 2018 |
| Cendrzak Logistic Ltd | Transport & logistics | 2019 |
| Censtretch Limited | Professional & scientific | 2004 |
| Centenary Holdings Limited | Professional & scientific | 1984 |
| Central & Regional Estates Limited | Extraterritorial | 2009 |
| Central Asia Investments Ltd | Mining & quarrying | 2022 |