| Campbell Plant Hire (Holdings) Limited | Professional & scientific | 2016 |
| Campfield Limited | Real estate | 2016 |
| Canal View (Failsworth) Residents Association Limited | Households | 2006 |
| Canal Walks Management Company Limited | Households | 2019 |
| Canary Motorcycle Tours Limited | Administrative & support | 2012 |
| Candice Aesthetics Ltd | Health & social care | 2021 |
| Candid Global TA Consulting Limited | Professional & scientific | 2024 |
| Candle Warehouse Ltd | Wholesale & retail | 2011 |
| Candy Investments Ltd. | Construction | 2005 |
| Candyx Ltd | Manufacturing | 2025 |
| Canithos Limited | Administrative & support | 2016 |
| Canopy Bidco Limited | Other services | 2017 |
| Canopy Holdco Limited | Other services | 2017 |
| Canopy Labs AI Limited | Information & communication | 2026 |
| Canopy Management Limited | Administrative & support | 2012 |
| Canopy Midco Limited | Other services | 2017 |
| Canopy Property Management Limited | Real estate | 2016 |
| Canspot Data Limited | Information & communication | 2024 |
| Canute Pharma Limited | Manufacturing | 2020 |
| CAP22 Limited | Professional & scientific | 2021 |
| Capax Projects Limited | Professional & scientific | 2023 |
| Cape ED Limited | Professional & scientific | 2018 |
| Cape Global Holdings Limited | Financial services | 2022 |
| Caped Crusader Limited | Professional & scientific | 2023 |
| Capedge Limited | Financial services | 2025 |
| Capello Media Solutions Ltd | Administrative & support | 2008 |
| Capestone Supplies Limited | Professional & scientific | 2022 |
| Capex Project Controls Limited | Professional & scientific | 2022 |
| Capify Group Limited | Financial services | 2018 |
| Capify Holdings Limited | Financial services | 2018 |
| Capify Limited | Administrative & support | 2016 |
| Capify UK Group Limited | Financial services | 2018 |
| Capify UK Limited | Financial services | 2018 |
| Capital Allowance Specialists Limited | Professional & scientific | 2023 |
| Capital Care Manchester Limited | Health & social care | 2024 |
| Capital Digital Limited | Professional & scientific | 2022 |
| Capital Planning Solutions Limited | Administrative & support | 2013 |
| Capitalfin LP | | 2021 |
| Capitalwise Limited | Administrative & support | 2019 |
| Capmog Limited | Real estate | 2014 |
| Capstone Financial Management Ltd | Financial services | 2014 |
| Capterio Limited | Professional & scientific | 2018 |
| Capterio Trustees Limited | Professional & scientific | 2020 |
| CAPTUR3 Ltd | Other services | 2021 |
| Car Audio and Accessories Centre Ltd | Wholesale & retail | 2013 |
| Car Finance 360 Limited | Wholesale & retail | 2018 |
| Car Plug MCR Ltd | Wholesale & retail | 2021 |
| Caragh Limited | Wholesale & retail | 2007 |
| Caratz Limited | Wholesale & retail | 2022 |
| Carbon Free Britain Ltd | Professional & scientific | 2024 |
| Carbon Wise Solutions Ltd | Professional & scientific | 2025 |
| Carbonation Techniques Limited | Manufacturing | 2004 |
| Cardigan Bay Development Limited | Professional & scientific | 2003 |
| Cardiologistics Ltd | Health & social care | 2025 |
| Cardiology Clinic Ltd | Health & social care | 2020 |
| Cardsnbadges LLP | | 2012 |
| Care Access Research UK Limited | Health & social care | 2023 |
| Care Medica Ltd | Health & social care | 2023 |
| CARE4MANY Healthcare Services Ltd | Health & social care | 2020 |
| Career Interim Limited | Professional & scientific | 2025 |
| Career Pathways Limited | Administrative & support | 2014 |
| Careerminds UK Limited | Administrative & support | 2004 |
| Careful Counts Bookkeeping Ltd | Professional & scientific | 2025 |
| Careland Limited | Real estate | 1999 |
| Carelight Limited | Professional & scientific | 2021 |
| Caresoft UK Ltd | Administrative & support | 2012 |
| Caretua Ltd | Health & social care | 2022 |
| Careycourt Estates Ltd | Real estate | 2012 |
| Cargonet Asia Ltd | Transport & logistics | 2013 |
| Cargurus UK Limited | Other services | 2016 |
| Caribbean Biodiversity Fund | Other services | 2012 |
| Carisbrooke Investments Limited Partnership | | 1999 |
| Carisbrooke Suon Developments Limited Partnership | | 2001 |
| Carisbrooke Suon Limited Partnership | | 2000 |
| Carlisle Refrigeration Group Holdings Limited | Financial services | 2023 |
| Carlo Developments Limited | Real estate | 2020 |
| Carlton (Hull) Limited | Real estate | 1980 |
| Carlyn Court Limited | Households | 2003 |
| Carmina Projects Limited | Professional & scientific | 2017 |
| Carnival Ventures Ltd. | Professional & scientific | 1995 |
| Carol Sullivan Conveyancing Limited | Professional & scientific | 2020 |
| Carolyn Bowers Limited | Professional & scientific | 2013 |
| Carolyn Bowers Recruitment Limited | Professional & scientific | 2014 |
| Carpenter Europe Limited | Financial services | 2026 |
| Carpenter One Limited | Financial services | 2026 |
| Carpenter Two Limited | Financial services | 2026 |
| Carpo Ltd | Health & social care | 2026 |
| Carr Properties (Holdings) Ltd | Extraterritorial | 2017 |
| Carr's BK Ltd. | Financial services | 2017 |
| Carradale Management Limited | Households | 2010 |
| Carrier Wave Ltd | Professional & scientific | 2019 |
| Carrimed Facilities Management Ltd | Construction | 2019 |
| Carrot Fertility UK Ltd. | Health & social care | 2023 |
| Carrwood Consultancy Limited | Financial services | 2020 |
| Carrwood Finance Group Limited | Financial services | 2020 |
| Carrwood Lending Limited | Financial services | 2020 |
| Carrwood Properties Ltd | Real estate | 2023 |
| Carrylift Group Finance Limited | Administrative & support | 2015 |
| Carrylift Holdings Limited | Administrative & support | 2009 |
| Carted Events Limited | Hospitality | 2025 |