| Care and Clean Services Ltd | Administrative & support | 2026 |
| Care Consort Services Ltd | Public administration | 2022 |
| Care Contact Ltd | Public administration | 2022 |
| Care Cove Limited | Information & communication | 2023 |
| Care for Young People's Future CIC | Administrative & support | 2019 |
| Care Never Sleeps (South Yorkshire) Ltd | Health & social care | 2024 |
| Care Opinion CIC | Health & social care | 2017 |
| Care Staff Consultancy UK Ltd | Administrative & support | 2024 |
| Care to Consult Ltd | Extraterritorial | 2022 |
| Careerpulse Limited | Administrative & support | 2025 |
| Careers Enhanced Limited | Administrative & support | 2009 |
| Carelynk Limited | Health & social care | 2023 |
| Carequest Management Limited | Professional & scientific | 2026 |
| Carers Compass Management Ltd | Real estate | 2026 |
| Caribbean Apps LLP | | 2020 |
| Caribbean Delights Ltd | Hospitality | 2019 |
| Caribbean Express Line Limited | Transport & logistics | 1981 |
| Caribbean Fusion Ltd | Hospitality | 2012 |
| Caribbean Grill and Cocktails Ltd | Hospitality | 2025 |
| Caribbean Hotels LLP | | 2018 |
| Caribbean Q’Uisine Limited | Hospitality | 2025 |
| Caribbean Sports Club (Sheffield) Limited | Arts & recreation | 2007 |
| Caribou Bidco Limited | Financial services | 2021 |
| Caribou Midco I Limited | Financial services | 2021 |
| Caribou Midco II Limited | Financial services | 2021 |
| Carica Pets Limited | Information & communication | 2019 |
| Carin Hoff Ltd | Arts & recreation | 2017 |
| Caring and Hope Medical Ltd | Health & social care | 2020 |
| Caring Brands Australia Limited | Administrative & support | 2014 |
| Caring Brands Europe Limited | Health & social care | 2013 |
| Caring Hands (Care Services) EOT Limited | Financial services | 2023 |
| Caring Hands (Care Services) Ltd | Health & social care | 2009 |
| Caring Tides Care Limited | Health & social care | 2024 |
| Carl Dylan Resourcing Limited | Administrative & support | 2023 |
| Carl Harper EPA Limited | Education | 2024 |
| Carl Sykes Limited | Transport & logistics | 2018 |
| Carley House Ltd | Real estate | 2015 |
| Carlisle Autos Ltd | Wholesale & retail | 2025 |
| Carlisle Estates Ltd | Real estate | 2020 |
| Carlm Design Ltd. | Construction | 2008 |
| Carls Caravan Ltd | Hospitality | 2024 |
| Carlton Villa Limited | Real estate | 2005 |
| Carlyle Land Holdings Limited | Professional & scientific | 2020 |
| Carmel Music Limited | Arts & recreation | 2015 |
| Carmichael Orthopaedics Limited | Health & social care | 2011 |
| Carnage Distribution Ltd | Extraterritorial | 2025 |
| Carnova (2015) Ltd | Wholesale & retail | 2015 |
| Caro Holdings International Limited | Information & communication | 2022 |
| Carol Keeton Ltd. | Other services | 2010 |
| Carolina Court Limited | Real estate | 2015 |
| Carolina Whirlow Holdings Ltd | Real estate | 2022 |
| Carousel Europe Limited | Information & communication | 2020 |
| Carpet Workshop (UK) Ltd | Manufacturing | 2014 |
| Carprop 1 Ltd | Real estate | 2025 |
| Carprop 2 Ltd | Real estate | 2025 |
| Carprop 3 Ltd | Real estate | 2025 |
| Carr Dairy Leisure Ltd | Real estate | 2022 |
| Carr House Court Management Company Ltd | Other services | 2010 |
| Carr View Leisure Ltd | Hospitality | 2019 |
| Carreco Ltd | Other services | 2008 |
| Carrera Holdings Ltd | Real estate | 2016 |
| Carrickfinn Consulting Limited | Professional & scientific | 2022 |
| Carrie Anne Ltd | Wholesale & retail | 2024 |
| Carrier Cargus Ltd | Transport & logistics | 2021 |
| Carrington Road Limited | Construction | 2026 |
| Carroll Surgical Ltd | Health & social care | 2016 |
| Carrs Roofing Ltd | Construction | 2026 |
| Carrside Ltd | Construction | 2020 |
| Carrwood Cottages Ltd | Real estate | 2024 |
| Carrwood House Ltd | Real estate | 2023 |
| Carsave Leasing Ltd | Financial services | 1996 |
| Carsington Waterside Ltd | Wholesale & retail | 2026 |
| Carson-Clae Ltd | Wholesale & retail | 2018 |
| Carswells Ltd | Wholesale & retail | 2021 |
| Carter & Carter Ltd | Information & communication | 2014 |
| Carter Bailey Opticians Limited | Health & social care | 2007 |
| Carter Commercials Ltd | Wholesale & retail | 2007 |
| Carter Knowle Computing Limited | Information & communication | 2010 |
| Carter Knowle IT Services Ltd | Manufacturing | 2015 |
| Carter Smith Ltd. | Professional & scientific | 1996 |
| Carter Taylor Civil Engineering Limited | Construction | 2016 |
| Carters & Libertas Ltd | Information & communication | 2016 |
| Carters Electrical Services Ltd | Construction | 2017 |
| Carters of Chapeltown Limited | Wholesale & retail | 1960 |
| Cartledge & Sons Limited | Households | 2017 |
| Cartledge Building Solutions Limited | Real estate | 2025 |
| Cartwright Plant Hire Ltd | Administrative & support | 2025 |
| Cartwright Vehicle Conversions International Limited | Manufacturing | 2020 |
| Cartwright Vehicle Conversions Limited | Manufacturing | 2020 |
| Carways 1968 Ltd | Wholesale & retail | 2025 |
| Carys Artistries Limited | Arts & recreation | 2018 |
| CAS Academy Ltd | Professional & scientific | 2023 |
| CAS Recruitment UK Limited | Administrative & support | 2019 |
| Casa Andina Ltd | Hospitality | 2019 |
| Casa BE Limited | Financial services | 2011 |
| Casa Coffee Roasters Ltd | Hospitality | 2023 |
| Casa Fine Furniture Limited | Wholesale & retail | 2025 |
| Casa Grill & Pizza Ltd | Hospitality | 2026 |
| Casa Gómez Ltd | Manufacturing | 2021 |
| Casa Italia Restaurant Ltd | Administrative & support | 2023 |