| C&C 4U Ltd | Administrative & support | 2025 |
| C&Cl Ltd | Real estate | 2024 |
| C&N Property Partners Limited | Real estate | 2025 |
| C&X Property Ltd | Real estate | 2025 |
| C. & C. Seville Tank Transport Limited | | 1984 |
| C. Browne Ltd | Construction | 2014 |
| C. Dunsdon Consulting Ltd | Health & social care | 2025 |
| C.I. Johnstone Limited | Wholesale & retail | 1950 |
| C.M.T. Moss Ltd | Administrative & support | 2015 |
| C2C Engineering & Consultants Ltd | Education | 2019 |
| CA Project Management Services Limited | Information & communication | 2024 |
| CAB Polymers Limited | Water & waste | 2016 |
| Cabiletstro Ltd | Construction | 2025 |
| CAE TEK Ltd | Wholesale & retail | 2023 |
| Caelo Industries Ltd | Real estate | 2020 |
| Caelum Management Limited | Real estate | 2024 |
| Caerulea Sports Advisory Ltd | Professional & scientific | 2023 |
| Caesar Estates Ltd | Real estate | 2006 |
| Cafe 35 Manchester Ltd | Hospitality | 2018 |
| Cairndhu Property Management Limited | Extraterritorial | 2014 |
| Caladium Cyber Consultancy Services Limited | Information & communication | 2025 |
| Calculus Financial Limited | Financial services | 2013 |
| Calderon Consultancy Ltd | Professional & scientific | 2024 |
| Calderstone Limited | Real estate | 1999 |
| Caledonia Engineering Limited | Professional & scientific | 2024 |
| Callbro Limited | Real estate | 2025 |
| Callflex (2) Limited | Extraterritorial | 2023 |
| Callflex Limited | Extraterritorial | 2023 |
| Calverley Hughes Associates Limited | Professional & scientific | 2016 |
| Cambrai Crescent Ltd | Real estate | 2020 |
| Cambridge Court Care Home Limited | Health & social care | 2021 |
| Cambridge Verdant Limited | Financial services | 2019 |
| Camico Innovative Ltd | Wholesale & retail | 2024 |
| Campbell-Connors Limited | Professional & scientific | 2018 |
| Campfire Group Ltd | Professional & scientific | 2019 |
| Canal ST Manchester Ltd | Information & communication | 2007 |
| Cancarp Limited | Manufacturing | 1982 |
| Cangoomove Ltd | Transport & logistics | 2024 |
| Canis Television & Media Limited | Information & communication | 2004 |
| Cantermore Ltd | Extraterritorial | 2012 |
| Canvey Island Estates Ltd | Real estate | 2024 |
| Canvey Nursery Limited | Health & social care | 2025 |
| Canvey Property Group Ltd | Real estate | 2026 |
| Canveylodge Ltd | Real estate | 2022 |
| Capa the Global Education Network Limited | Administrative & support | 2013 |
| Capam Construction Ltd | Construction | 2025 |
| Capelulo Ltd | Real estate | 2019 |
| Capital Bridging Solutions Ltd | Real estate | 2020 |
| Capital Builders NW Ltd | Construction | 2021 |
| Capital Connections (MCR) Ltd | Financial services | 2025 |
| Capital Edge Properties Ltd | Real estate | 2020 |
| Capital Estates (London) Ltd | Real estate | 2021 |
| Capital Trading (NW) Ltd | Wholesale & retail | 2019 |
| Capitex JV Limited | Real estate | 2024 |
| Capmer Hanington Limited | Real estate | 2023 |
| Capone Ltd | Wholesale & retail | 2025 |
| Capriconny Mechanical Ltd | Wholesale & retail | 2017 |
| Capricorn Motorhomes Ltd | Wholesale & retail | 2019 |
| Capsil Limited | Financial services | 2023 |
| Captain Pine Ltd | Real estate | 2017 |
| Car Recovery Guys Ltd | Professional & scientific | 2024 |
| Cara Data Ltd | Information & communication | 2020 |
| Carbon Creative Limited | Professional & scientific | 2002 |
| Carbon Creative Trustees Limited | Administrative & support | 2022 |
| Carbonfuturex Group Ltd | Construction | 2023 |
| Carbungco Ltd | Health & social care | 2023 |
| Cardinal Beacon Limited | Professional & scientific | 2008 |
| Cardinal Health U.K. International Holding LLP | | 2008 |
| Care Phocus Ltd | Wholesale & retail | 2025 |
| Care Solutions (Liverpool) Ltd | Health & social care | 2020 |
| Care Total Ltd | Administrative & support | 2020 |
| Careersforyou Limited | Education | 2025 |
| Carefirst Homes Limited | Professional & scientific | 2005 |
| Carely Haven Cleaning Service Ltd | Administrative & support | 2026 |
| Carely Haven Ltd | Health & social care | 2025 |
| Careprofessionals Ltd | Administrative & support | 2021 |
| Carfix Manchester Limited | Wholesale & retail | 2021 |
| Cargp Ltd | Wholesale & retail | 2026 |
| Carina Limited | Real estate | 2018 |
| Carinyo Care Ltd | Health & social care | 2022 |
| Carissa B Ltd | Administrative & support | 2018 |
| Caritas Diocese of Salford | Health & social care | 2008 |
| Caritas Diocese of Salford Trading Limited | Wholesale & retail | 2013 |
| Carler Ltd | Information & communication | 2022 |
| Carlito L W Limited | Administrative & support | 2016 |
| Carlton Court (Kersal) Management Company Limited | Households | 1970 |
| Carlton Properties Manchester Ltd | Real estate | 2015 |
| Carlton Property Investment Limited | Real estate | 2015 |
| Carmona Court Management Ltd | Households | 2023 |
| Carnarvon Estates Ltd | Real estate | 2022 |
| Carnival Kitchen Ltd | Administrative & support | 2018 |
| Carole Nash Insurance Consultants Limited | Financial services | 1991 |
| Carr Street SPV Limited | Real estate | 2016 |
| Carribbean Sunrise Fast Food Co Ltd | Hospitality | 2014 |
| Carrickton Ltd | Professional & scientific | 2001 |
| Carroll Capital Ltd | Real estate | 2021 |
| Carrwood Properties (NO. 2) Ltd | Professional & scientific | 2004 |
| Cars + Limited | Other services | 2018 |
| Cars With Confidence Limited | Wholesale & retail | 2024 |
| Carswell Legal Services Limited | Professional & scientific | 2023 |