| Calico Holdings Ltd | Hospitality | 2019 |
| Calin Cabs Ltd | Transport & logistics | 2024 |
| Calla Distribution Ltd | Wholesale & retail | 2012 |
| Calleva Leisure Limited | Wholesale & retail | 2013 |
| Calljohan Ltd | Other services | 2024 |
| Calmore Limited | Administrative & support | 1980 |
| CAM Woodwork Ltd | Construction | 2020 |
| Camboso Limited | Information & communication | 2005 |
| Cambrai Productions Ltd | Information & communication | 2024 |
| Camera Telematics (UK) Limited | Wholesale & retail | 2017 |
| Campbell Property South West Limited Partnership | | 2007 |
| Campbellproperty Student Accommodation Investment Fund (Birmingham) LP | | 2006 |
| Campion House Freehold Limited | Households | 2019 |
| Campion House Residents Association Limited | Households | 1999 |
| Camplong Consulting Ltd | Information & communication | 2020 |
| Candescence Ltd | Professional & scientific | 2009 |
| Candid Films Ltd | Information & communication | 2020 |
| Candore Consulting Limited | Professional & scientific | 2023 |
| Caniperformance Limited | Administrative & support | 2019 |
| Canna Growth Hub Limited | Professional & scientific | 2020 |
| Cansr Clinic Limited | Health & social care | 2017 |
| Cansr.Com Limited | Health & social care | 2018 |
| Capatina Transport Ltd | Transport & logistics | 2024 |
| Capdevinvest Ltd | Professional & scientific | 2020 |
| Cape Buffalo Design Limited | Professional & scientific | 2013 |
| Capital Cables Limited | Extraterritorial | 2000 |
| Caraversions Ltd | Manufacturing | 2019 |
| Carboon Ltd | Agriculture & fishing | 2023 |
| Cardan Commerce Limited | Manufacturing | 2011 |
| Care for Constructions Ltd | Construction | 2020 |
| Care Partners (Newbury) Ltd | Other services | 2012 |
| Care Recruitment Hub Limited | Other services | 2022 |
| Careers Cloud Limited | Information & communication | 2020 |
| Caringkind Ltd | Health & social care | 2021 |
| Carl Bridger Ltd. | Manufacturing | 2011 |
| Carlau Consulting Limited | Professional & scientific | 2014 |
| Carlin Business Intelligence Ltd | Information & communication | 2023 |
| Carlton Methanol Limited | Professional & scientific | 2021 |
| Carmdale Ltd | Professional & scientific | 2011 |
| Carmine Consulting Ltd | Other services | 2023 |
| Caroline Carsey Ltd | Professional & scientific | 2022 |
| Carolyne OT Limited | Health & social care | 2023 |
| Carpenters Court Freehold Ltd | Households | 2013 |
| Carpenters Court Residents Limited | Households | 2003 |
| Carrot & Honey Ltd | Professional & scientific | 2025 |
| Carrotcake Studio Ltd | Information & communication | 2024 |
| Cars Coffee Cake Limited | Wholesale & retail | 2019 |
| Carter 2966 Limited | Professional & scientific | 2017 |
| Carter Marie Procurement Ltd | Manufacturing | 2021 |
| Cartophilic Society of Great Britain Limited(The) | Information & communication | 1942 |
| Cascade Flooring Ltd | Construction | 2017 |
| Castle & Hern Ltd | Manufacturing | 2025 |
| Castle Group Holdings Limited | Administrative & support | 2000 |
| Castle House Management Limited | Households | 1987 |
| Castle Industrial Park Limited | Real estate | 1987 |
| Castle Media Limited | Information & communication | 2012 |
| Castle Microwave Limited | Wholesale & retail | 1984 |
| Castle Microwave Systems Limited | Wholesale & retail | 1981 |
| Castle Valley Films Ltd | Information & communication | 2018 |
| Catalpa IT Limited | Extraterritorial | 2014 |
| Catering by Natalie Ltd | Hospitality | 2019 |
| Catheline Gardner Ltd | Administrative & support | 2017 |
| Catherine Woolfitt Associates Limited | Professional & scientific | 2008 |
| Cauldron Science Limited | Information & communication | 2009 |
| Cavandish Interiors Limited | Professional & scientific | 2007 |
| CB Norbury Ltd | Other services | 2018 |
| CBZ Media Ltd | Education | 2012 |
| CC Consultech Ltd | Information & communication | 2023 |
| CC Motorsport Racing Limited | Arts & recreation | 2023 |
| CCS Car Sales (Thatcham) Limited | Wholesale & retail | 2012 |
| CCS Restoration LLP | | 2012 |
| CD Composites Ltd | Manufacturing | 2026 |
| CDC Performance Limited | Education | 2015 |
| Cecillion Limited | Other services | 2022 |
| Ceiling Services Limited | Construction | 2017 |
| Cementitious Solutions Limited | Other services | 2019 |
| Cendomus Limited | Administrative & support | 2018 |
| Censcribe Limited | Information & communication | 2024 |
| Central Ventilation Services Limited | Construction | 2021 |
| Cerney Investments Ltd | Professional & scientific | 2021 |
| CERTIFIC8 Limited | Extraterritorial | 2005 |
| Cervus Group Ltd | Professional & scientific | 2009 |
| Cervus Insilico Ltd | Information & communication | 2025 |
| CES Recruitment Limited | Extraterritorial | 2020 |
| CFR Staff Ltd | Administrative & support | 2024 |
| CGE Consulting Ltd | Professional & scientific | 2018 |
| CGE Group Ltd | Financial services | 2018 |
| CGE Property Holdings Ltd | Real estate | 2018 |
| Ch-R Family Solicitors Limited | Professional & scientific | 2013 |
| Chaila Consulting Limited | Information & communication | 2024 |
| Chakra Hair and Beauty Studio Limited | Other services | 2017 |
| Chalmers Enterprises Limited | Hospitality | 2003 |
| Change ++ Holdings Limited | Financial services | 2019 |
| Change ++ Limited | Information & communication | 1996 |
| Channel Installations Limited | Extraterritorial | 2000 |
| Channel Safety Systems Group Limited | Extraterritorial | 2010 |
| Channel Safety Systems Limited | Extraterritorial | 1999 |
| Chapel Rise Management Company Limited | Households | 1997 |
| Chapel Stud Limited | Agriculture & fishing | 2010 |
| Chari Ventures Ltd | Information & communication | 2024 |