| C&L Racing Ltd | Arts & recreation | 2009 |
| C&T Estates Limited | Real estate | 2018 |
| C. E. Emerson Ltd | Transport & logistics | 2025 |
| C. Stathori Enterprises Ltd | Hospitality | 2025 |
| C.A.Palmer Building Ltd | Construction | 2025 |
| C.B.M. Designs Limited | Professional & scientific | 1985 |
| C.G.P. Engineering Ltd | Manufacturing | 1986 |
| C.H.C. & Shire Properties Limited | Construction | 1977 |
| C.L.Catterall Property Services Limited | Households | 2012 |
| C.L.N. Construction Limited | Construction | 2002 |
| C.Lilley & Sons Limited | Professional & scientific | 1964 |
| CA Logistics 2019 Limited | Transport & logistics | 2019 |
| Cabaliero Ltd | Manufacturing | 2022 |
| Cabapi Limited | Real estate | 2022 |
| Caboodle Technology Group Limited | Administrative & support | 2018 |
| Caboodle Technology Limited | Administrative & support | 2009 |
| Cafe 2U Castle Donington Limited | Wholesale & retail | 2019 |
| Cafe Alexa Ltd | Hospitality | 2026 |
| Cafe-Ambience Ltd | Hospitality | 2018 |
| Caffe Centro Limited | Hospitality | 2020 |
| Cairns Developments (Nottingham) Limited | Wholesale & retail | 2001 |
| Cairns Heritage Holdings Limited | Construction | 2013 |
| Cairns Heritage Homes (Newark) Limited | Construction | 2022 |
| Cairns Heritage Homes (Southwell) Limited | Construction | 2021 |
| Cairns Heritage Homes Limited | Construction | 2009 |
| Cairns Heritage Homes NO 7 Limited | Construction | 2017 |
| Cairns Homes Limited | Construction | 2024 |
| Caitlin Pheby Marketing Limited | Professional & scientific | 2020 |
| Calculus Health Ltd | Manufacturing | 2024 |
| Caleb Wright Property Ltd | Real estate | 2025 |
| Caljoe Limited | Real estate | 2020 |
| Call a KAB Ltd | Arts & recreation | 2024 |
| Cals Auto Data Ltd | Wholesale & retail | 2025 |
| Calverley Tax & Accounts Ltd | Professional & scientific | 2018 |
| Camael Properties Ltd | Real estate | 2000 |
| Cambourne Client Services Limited | Extraterritorial | 2009 |
| Cambourne Financial Planning Limited | Financial services | 1995 |
| Cambourne Holdings Limited | Extraterritorial | 2009 |
| Cammell Holdings Ltd | Financial services | 2026 |
| Camob Ltd | Transport & logistics | 2001 |
| Camp Sparta Limited | Administrative & support | 2017 |
| Campbell Communications Limited | Professional & scientific | 2011 |
| Campbell Safety Consultancy Limited | Professional & scientific | 2009 |
| Campbell Scientific Limited | Manufacturing | 1985 |
| Campden Instruments Ltd | Extraterritorial | 2006 |
| Campix UK Ltd | Manufacturing | 2026 |
| Camstone Garage Limited | Wholesale & retail | 1996 |
| Canal NTM Limited | Manufacturing | 2023 |
| Canal Side Mews Management Limited | Households | 2000 |
| Canine Partners for Independence | Other services | 1990 |
| Canopy Tree Services Limited | Agriculture & fishing | 2012 |
| CAPACITY2LEARN Ltd | Information & communication | 2009 |
| Capallinn Limited | Manufacturing | 2018 |
| Capdragon Ltd | Information & communication | 2019 |
| Capital Z Media Ltd | Hospitality | 2023 |
| Capone Solutions Ltd | Information & communication | 2026 |
| Capstone Minds Ltd | Education | 2022 |
| Captivating Nature Limited | Administrative & support | 2018 |
| Car Audio Revolution Ltd | Wholesale & retail | 2023 |
| Car Doctorz Ltd | Wholesale & retail | 2019 |
| Car Lock Systems UK Ltd | Wholesale & retail | 2025 |
| Carbon White Group Ltd | Administrative & support | 2023 |
| Cardguard Ltd | Wholesale & retail | 2026 |
| Care Build Group Limited | Construction | 2017 |
| Carebridge Home Care Ltd | Health & social care | 2024 |
| Cargo Nova Logistics Limited | Transport & logistics | 2025 |
| Carillon Software Solutions Ltd | Information & communication | 2026 |
| Caringlinks Limited | Administrative & support | 2008 |
| Carisbrooke Motors Ltd | Wholesale & retail | 2020 |
| Carlton Court (Loughborough) Residents Association Limited | Households | 2001 |
| Carnation Crafts Limited | Administrative & support | 2019 |
| Carpet Image Ltd | Wholesale & retail | 2012 |
| Carr & Day & Martin | Manufacturing | 1990 |
| Carreg WEN Productions Ltd | Professional & scientific | 2014 |
| Carrelli Homes Ltd | Construction | 2018 |
| Carrelli Partnership Limited | Hospitality | 2011 |
| Carrison Property Ltd | Real estate | 2026 |
| Cars Remarketing Limited | Wholesale & retail | 2013 |
| Carson Moore Limited | Financial services | 2016 |
| Cartels Barber Ltd | Other services | 2023 |
| Cartels Corporation Ltd | Real estate | 2023 |
| Cartwright Homes Limited | Extraterritorial | 2015 |
| Caruso Pallet Solutions Ltd | Professional & scientific | 2023 |
| Carys Plant Ltd | Health & social care | 2025 |
| Cash Protection Agency Limited | Administrative & support | 1993 |
| Cashbrokers (Loughborough) Ltd | Wholesale & retail | 2023 |
| Caskey HR Limited | Administrative & support | 2019 |
| Cassie & Co (New Build) Ltd | Construction | 2020 |
| Cassie Energy Ltd | Construction | 2024 |
| Castellan Consulting LLP | | 2010 |
| Castiglione Consulting Ltd | Education | 2023 |
| Castle Food Health & Safety Limited | Administrative & support | 2020 |
| Castle Integration Limited | Administrative & support | 2008 |
| Castle Motor Hub Limited | Wholesale & retail | 2023 |
| Castle Quay Property Management Limited | Households | 1989 |
| Castle Retail Ltd | Wholesale & retail | 2023 |
| Castle View Nursery Limited | Education | 2016 |
| Castle Workspace Ltd | Real estate | 2022 |
| Castledine Environmental Ltd | Professional & scientific | 2019 |
| Castleman Commercial Ltd | Financial services | 2026 |