| Calexa Consulting Limited | Professional & scientific | 2018 |
| Calibre Projects Ltd | Construction | 2016 |
| Calin&Alex Ltd | Transport & logistics | 2019 |
| Calinsco Ltd | Construction | 2015 |
| Callpro UK Ltd | Administrative & support | 2025 |
| Callum Macleod Racing Ltd | Arts & recreation | 2015 |
| Callus Capitals UK Ltd | Administrative & support | 2017 |
| Callus Luxurious Apartments and Homes Ltd | Real estate | 2018 |
| Callyhaze Significance Limited | Health & social care | 2024 |
| Calm Cart Ltd | Wholesale & retail | 2025 |
| Calmeco Holdings Ltd | Financial services | 2024 |
| Calmic Company Limited | Transport & logistics | 2015 |
| Calmwater Services Ltd | Professional & scientific | 2020 |
| Caloventia Consulting Limited | Information & communication | 2015 |
| Calsands Limited | Other services | 2020 |
| Calvana Lettings Ltd | Real estate | 2025 |
| Calvary Property Investments UK Limited | Real estate | 2023 |
| Calvus Ltd | Administrative & support | 2026 |
| Calzone Food Solution Ltd | Hospitality | 2026 |
| Camber Construction Ltd | Construction | 2018 |
| Camberley Dining Ltd | Hospitality | 2024 |
| Camberwell E Foods Ltd | Hospitality | 2020 |
| Cambridge Court Residents RTM Company Ltd | Households | 2015 |
| Cambridge Creative Limited | Professional & scientific | 2020 |
| Cambridge Signal Installation Ltd | Construction | 2007 |
| Cambridge Street Development Project Ltd | Construction | 2023 |
| Cambridgeshire Horizons Limited | Professional & scientific | 2004 |
| Camden Media Limited | Information & communication | 2004 |
| Camelot Rentals Ltd | Households | 2022 |
| Camelot U.P.V.C. Fascias & Guttering Limited | Construction | 1998 |
| Camelservices Ltd | Construction | 2026 |
| Cameratec Limited | Administrative & support | 2013 |
| Cameron Butcher Group Limited | Professional & scientific | 2012 |
| Cameron Craig Limited | Real estate | 2014 |
| Camfield Holdings Limited | Wholesale & retail | 2011 |
| Camlar Limited | Administrative & support | 2006 |
| Camline Services (East Midlands) Limited | Water & waste | 2014 |
| Camloc Technical Services Group Ltd | Administrative & support | 2012 |
| Camp Decor Ltd | Construction | 2020 |
| Camp Hill Community Centre | Arts & recreation | 2012 |
| Campau Build Limited | Construction | 2026 |
| Campbell and Green Interiors Limited | Manufacturing | 2023 |
| Campbell Plant Hire (Northampton) Ltd | Administrative & support | 2015 |
| Campbell Plastics Limited | Manufacturing | 1975 |
| Campbeltown Contracting Ltd | Information & communication | 2025 |
| Camper Buyer Limited | Wholesale & retail | 2016 |
| Camtech Building Products Ltd | Wholesale & retail | 2002 |
| Camtech Holdings Limited | Financial services | 2024 |
| CAN Abdullah Real Estate Limited | Real estate | 2019 |
| CAN Developments 2015 Ltd | Construction | 2015 |
| Canadian Beaver House Company Ltd | Real estate | 2024 |
| Canal Wholesale Supplies Ltd | Wholesale & retail | 2019 |
| Canalside Fenny Ltd | Construction | 2017 |
| Canalside Restaurant Limited | Hospitality | 2021 |
| Canary Corp Limited | Information & communication | 2023 |
| Candle-Lux Ltd | Manufacturing | 2025 |
| Candor Consulting Limited | Professional & scientific | 2021 |
| Candy’S Flavours Ltd | Hospitality | 2025 |
| Canis Major Tutors Limited | Education | 2020 |
| Canny Property Limited | Real estate | 2023 |
| Canoville Coaching Football Centre Ltd | Administrative & support | 2021 |
| Canoville Coaching Limited | Arts & recreation | 2015 |
| Canterbury North 10 Renewables Limited | Professional & scientific | 2023 |
| Canto Learning Limited | Health & social care | 2016 |
| Cantoch Limited | Real estate | 2023 |
| Canuta Interiors Ltd | Construction | 2015 |
| Canvas Service Limited | Transport & logistics | 2025 |
| CAP Electrical Solutions Limited | Construction | 2014 |
| CAP Fencing Ltd | Manufacturing | 2025 |
| Capatina Ciprian Ltd | Transport & logistics | 2020 |
| Capella Systems Europe Ltd | Information & communication | 2025 |
| Capital Build Limited | Construction | 2012 |
| Capital Investments Leisure Limited | Hospitality | 1995 |
| Capital Northampton Ltd | Wholesale & retail | 2018 |
| Capital OFF Licence Ltd | Wholesale & retail | 2014 |
| Capital Property Holdings Ltd | Financial services | 2021 |
| Capital Recoveries Limited | Extraterritorial | 1995 |
| Capital Spice Limited | Hospitality | 2024 |
| Capital Window Tinting Ltd | Professional & scientific | 2023 |
| Capitalrise Property Limited | Real estate | 2026 |
| Capra Trans Limited | Transport & logistics | 2020 |
| Capri Brickwork Limited | Construction | 2020 |
| Capri Services UK Ltd | Professional & scientific | 2021 |
| Capsol Joinery Limited | Construction | 2004 |
| Capture Capital Limited | Real estate | 2004 |
| Captured by Justin Ltd | Professional & scientific | 2023 |
| Capturehub Limited | Information & communication | 2016 |
| Car Purchase (Northampton) Limited | Wholesale & retail | 1986 |
| Car Truck and BUS Engine Export Ltd | Other services | 2022 |
| Cara Rose Holdings Ltd | Financial services | 2021 |
| Caravan Investors Group Limited | Financial services | 2025 |
| Carawal Limited | Extraterritorial | 2023 |
| Carbon Doctor Ltd | Wholesale & retail | 2022 |
| Carbon Factory Limited | Wholesale & retail | 2019 |
| Carbon Fibre Tubing Limited | Wholesale & retail | 2024 |
| Carbon Hogs Ltd | Administrative & support | 2025 |
| Carbon Neutral Vending Ltd | Administrative & support | 2012 |
| Carbon SOL Automotive Ltd | Wholesale & retail | 2018 |
| Carbonco Limited | Administrative & support | 2015 |
| Carbyne UK Limited | Information & communication | 2019 |