| Captains Catch Limited | Hospitality | 2018 |
| Captains Curry Ltd | Hospitality | 2026 |
| Captivara Limited | Financial services | 2023 |
| Captivate Events Limited | Real estate | 2023 |
| Captivo Solutions Ltd | Information & communication | 2026 |
| Capto Enterprise Ltd | Professional & scientific | 2013 |
| Capture Events Ltd | Professional & scientific | 2023 |
| Capture to the Moon and Back Ltd | Professional & scientific | 2020 |
| Capulet UND Montague Limited | Administrative & support | 2010 |
| Car Astute Limited | Wholesale & retail | 2023 |
| Car Audio Mastering Ltd | Wholesale & retail | 2024 |
| Car Body Work 2025 Ltd | Manufacturing | 2025 |
| Car Boot Direct Limited | Wholesale & retail | 2018 |
| Car Care Centre (Kings Norton) Ltd | Wholesale & retail | 2004 |
| Car Care Centre Bham Ltd | Wholesale & retail | 2024 |
| Car Delivery Company Ltd | Transport & logistics | 2022 |
| Car Exclusive I & a Limited | Manufacturing | 2016 |
| Car Finance Today Limited | Wholesale & retail | 2020 |
| Car Hospital Motor Services Limited | Wholesale & retail | 2012 |
| Car Hub Birmingham Ltd | Wholesale & retail | 2019 |
| Car Jackalls Ltd | Wholesale & retail | 2025 |
| Car LAB Birmingham Ltd | Wholesale & retail | 2024 |
| Car Leasing Solutions Limited | Financial services | 2015 |
| Car Local Hub Ltd | Wholesale & retail | 2026 |
| Car Look Limited | Wholesale & retail | 2025 |
| Car Motional Limited | Wholesale & retail | 2025 |
| Car Move Limited | Transport & logistics | 2020 |
| Car Parts Expose Line Ltd | Wholesale & retail | 2024 |
| Car Parts Group Limited | Professional & scientific | 2010 |
| Car Parts Gurus Ltd | Wholesale & retail | 2024 |
| Car Parts Market Ltd | Wholesale & retail | 2018 |
| Car Recovery Network Ltd | Transport & logistics | 2025 |
| Car REG Promotions Ltd | Information & communication | 2021 |
| Car REG Rewards Ltd | Information & communication | 2021 |
| Car Repair Group Limited | Wholesale & retail | 2023 |
| Car Repair Hub Ltd | Wholesale & retail | 2024 |
| Car Right UK LP | | 2019 |
| Car Sale Agent Ltd | Wholesale & retail | 2023 |
| Car Spares (Cheshunt) Limited | Wholesale & retail | 2000 |
| Car Spares (Distribution) Holdings Limited | Wholesale & retail | 2014 |
| Car Spares (Distribution) Limited | Wholesale & retail | 2014 |
| Car Spares Limited | Wholesale & retail | 2015 |
| Car Spares Management Limited | Wholesale & retail | 2014 |
| Car Spray Repairs Centre Ltd | Wholesale & retail | 2024 |
| Car Storage Solutions (Bham) Ltd | Other services | 2022 |
| Car Tech Pro Services Ltd | Wholesale & retail | 2024 |
| Car Transport Ltd | Transport & logistics | 2019 |
| Car User UK Services Limited | Wholesale & retail | 2021 |
| Car Wash Crew Limited | | 2012 |
| Car Wash Hose Ltd | Manufacturing | 2025 |
| Car Wise Motors Ltd | Wholesale & retail | 2019 |
| Car-Ology Limited | Transport & logistics | 2013 |
| CAR4U Motors Ltd | Wholesale & retail | 2024 |
| Carab Solutions Limited | Real estate | 2024 |
| Carabella Properties Limited | Construction | 2013 |
| Caracal Horizon Ltd | Financial services | 2015 |
| Caradell Engineering Limited | Manufacturing | 2019 |
| Caramba Holdings Limited | Financial services | 2006 |
| Caramba Marketing Limited | Professional & scientific | 1978 |
| Carandaway Limited | Transport & logistics | 2016 |
| Carat & Origin Limited | Wholesale & retail | 2024 |
| Caravan Nest Holidays Ltd | Hospitality | 2025 |
| Carbamide Limited | Wholesale & retail | 2024 |
| Carbazaruk Ltd | Wholesale & retail | 2026 |
| Carbis Bay Aparthotel Ltd | Hospitality | 2020 |
| Carbites Ltd | Information & communication | 2026 |
| Carbits Limited | Wholesale & retail | 1978 |
| Carbon Housing Ltd | Real estate | 2020 |
| Carbon Klasse Ltd | Manufacturing | 2023 |
| Carbon Ltd | Wholesale & retail | 2025 |
| Carbon Motors Ltd | Administrative & support | 2025 |
| Carbon Technology Research Foundation CIC | Professional & scientific | 2020 |
| Carbon Trap Ltd | Wholesale & retail | 2020 |
| Carbon Two Limited | Professional & scientific | 2022 |
| CARBON1 Ltd | Professional & scientific | 2023 |
| Carboncure.Eco Ltd | Professional & scientific | 2026 |
| Carbonwise Construction Limited | Construction | 2023 |
| Carcloud Solutions Limited | Financial services | 2024 |
| Cardell Construction Ltd | Construction | 2012 |
| Cardiac Champs Ltd | Education | 2025 |
| Cardiff Logistics Ltd | Transport & logistics | 2025 |
| Cardiff Pointe Management Company Limited | Real estate | 2013 |
| Cardiff Van & Car Hire Ltd | Administrative & support | 2024 |
| Cardin Electrical Services Ltd | Construction | 2014 |
| Cardinal Distribution Park Management Limited | Real estate | 1991 |
| Cardinal House Management Limited | Households | 2015 |
| Cardinal Management Consulting Limited | Professional & scientific | 2017 |
| Cardinal Manufacturing Limited | Manufacturing | 2001 |
| Cardinal Square LLP | | 2004 |
| Cardingmill Investments Ltd | Real estate | 2022 |
| Cardioapex Limited | Health & social care | 2016 |
| Cardiodx Limited | Health & social care | 2025 |
| Cardiofix Limited | Real estate | 2017 |
| Cardogram Ltd. | Manufacturing | 2019 |
| Cardun Care CIC | Health & social care | 2024 |
| Cardus Construction Ltd | Construction | 2023 |
| Cardus Enterprises Ltd | Construction | 2023 |
| Care & Grace Ltd | Health & social care | 2019 |
| Care 2 Care Homes Limited | Real estate | 2026 |
| Care 4 U Care Services Limited | Administrative & support | 2021 |