| Calabrian Citrus Bergamot Limited | Wholesale & retail | 2012 |
| Caladan Capital Ltd | Financial services | 2022 |
| Calamata Four Limited | Administrative & support | 2005 |
| Calantheal Ltd | Professional & scientific | 2025 |
| Calcot Barn (Apartments) Management Company Limited | Households | 2017 |
| Calcot Cars Limited | Wholesale & retail | 2016 |
| Calcot Consulting Ltd. | Professional & scientific | 2012 |
| Calcot Park Management Company Limited | Households | 1961 |
| Calcot Services for Children (Assessments) Limited | Administrative & support | 2019 |
| Calcot Services for Children (Education) Limited | Administrative & support | 2019 |
| Calcot Services for Children Limited | Administrative & support | 2006 |
| Calcot Window Services Ltd | Wholesale & retail | 2020 |
| Caldera Group Ltd | Wholesale & retail | 2022 |
| Caldere Associates Ltd | Information & communication | 2003 |
| Caleb Zarth Ltd | Information & communication | 2023 |
| Calgro Ltd | Wholesale & retail | 2023 |
| Caliber Consulting Ltd | Information & communication | 2009 |
| Calicap Ltd | Real estate | 2024 |
| Calico Assets Limited | Real estate | 2019 |
| Calidus Homes Limited | Construction | 2009 |
| Calidus Property Limited | Construction | 2015 |
| California One Limited | Hospitality | 2020 |
| Californian Beehive Limited | Other services | 2025 |
| Callan Limited | Information & communication | 1997 |
| Calleva Partners Limited | Professional & scientific | 2003 |
| Callstream Limited | Information & communication | 1999 |
| Callund and Company Limited | Financial services | 1975 |
| Callund Consulting Limited | Public administration | 1988 |
| Calm Heart Ltd | Wholesale & retail | 2023 |
| Calmag Holdings Limited | Financial services | 2023 |
| Calmag Limited | Administrative & support | 2001 |
| Calmag Yorkshire Limited | Wholesale & retail | 2005 |
| Calpine Limited | Professional & scientific | 1945 |
| Calvert & Danby Limited | Professional & scientific | 1987 |
| Calypsa Limited | Professional & scientific | 2016 |
| Camberford Developments Ltd | Construction | 2012 |
| Cambio Partners Ltd | Professional & scientific | 2025 |
| Cambridge Carbon Capture Limited | Professional & scientific | 2011 |
| Cambridge Estates Limited | Construction | 1982 |
| Cambridge Garage (Portsmouth) Limited | Wholesale & retail | 1963 |
| Cambridge Garage Motor Holdings Limited | Financial services | 2019 |
| Cambridge Place Advisors Limited | Administrative & support | 2014 |
| Cambridge Place Holdings (UK) Limited | Administrative & support | 2005 |
| Cambridge Place Investment Management LLP | | 2002 |
| Cambridge Place Limited | Administrative & support | 2002 |
| Cambridge Place Partners (UK) Limited | Administrative & support | 2004 |
| Camden Creations Ltd | Wholesale & retail | 2025 |
| Camden Mills LLP | | 2021 |
| Camelid Veterinary Services Limited | Professional & scientific | 2013 |
| Cameo Carpets Limited | Construction | 2023 |
| Cameoplumbing Ltd | Construction | 2026 |
| Camera Innovations Limited | Information & communication | 2017 |
| Cameron Consulting Associates Limited | Extraterritorial | 2020 |
| Camillus Health Care Ltd | Health & social care | 2012 |
| Camino Tours Ltd | Administrative & support | 2023 |
| Cammell Associates Ltd | Professional & scientific | 2003 |
| Campbell Gordon Holdings Limited | Real estate | 2016 |
| Campbell Gordon Limited | Real estate | 2015 |
| Campbellstrang Ltd | Administrative & support | 2015 |
| Campfire Equipment Rentals Limited | Financial services | 2020 |
| Campfire Holdings Ltd | Manufacturing | 2024 |
| Campino Consulting Ltd | Professional & scientific | 2019 |
| Campion Equine Limited | Transport & logistics | 2024 |
| Campion Ventures Limited | Wholesale & retail | 2011 |
| Campus B Consulting Limited | Professional & scientific | 2021 |
| Campus XR Limited | Information & communication | 2021 |
| Camra Creative Limited | Information & communication | 2025 |
| Cams IT Solution Limited | Information & communication | 2022 |
| Camus Holdings Ltd | Financial services | 2022 |
| Camwith Flat Management Limited | Households | 1996 |
| Camy Limited | Health & social care | 2017 |
| Canadian LOG Ltd | Professional & scientific | 2013 |
| Canary Care Living Ltd | Real estate | 2024 |
| Canary Care Services Ltd | Health & social care | 2021 |
| Canary Home Care Services Ltd | Health & social care | 2025 |
| Candaes Ltd | Professional & scientific | 2023 |
| Candescent Lighting Ltd | Manufacturing | 2023 |
| Candid Companion Limited | Wholesale & retail | 2021 |
| Candida Wooldridge Ltd | Information & communication | 2015 |
| Cando Industries Limited | Real estate | 2025 |
| Candoora Ltd | Information & communication | 2026 |
| Candour Foods Limited | Wholesale & retail | 2024 |
| Candour Recruitment Limited | Administrative & support | 2014 |
| Candy Networks Ltd | Information & communication | 2018 |
| Candy Quest Ltd | Wholesale & retail | 2025 |
| Candy Wolf Limited | Information & communication | 2015 |
| Canford Court (Reading) Management Co.Limited | Households | 1970 |
| Cangas Finance UK Limited | Financial services | 2017 |
| Canine Laser Solutions Ltd | Professional & scientific | 2023 |
| Canineapex Ltd | Professional & scientific | 2023 |
| Cankio Ltd | Real estate | 2026 |
| Canopy House Limited | Real estate | 2026 |
| Canplan Ltd | Professional & scientific | 2025 |
| Cantelupe Solar Limited | Energy | 2010 |
| CAO Plumbing Limited | Construction | 2016 |
| Capa Tech Limited | Information & communication | 2024 |
| Capability Green Limited | Real estate | 1987 |
| Capable Contractors Limited | Administrative & support | 2013 |
| Capalus People Consulting Ltd | Professional & scientific | 2024 |
| Cape Cove Limited | Wholesale & retail | 2021 |