| Caraston Hall Support Limited | Exeter | 2009 |
| Caraston Holdings Ltd | Exeter | 2022 |
| Carat Solutions Ltd | Maidstone | 2023 |
| Caratela Optics Limited | Leicester | 2025 |
| Caraway Health Limited | Kington | 2026 |
| Caraway House Care Limited | Slough | 2021 |
| Carbdent Ltd | Canterbury | 2022 |
| Carben Health Ltd | Barking | 2025 |
| Carbon Aware Productions Limited | Radstock | 2020 |
| Carbon Nutrition Limited | Kings Langley | 2024 |
| Carbonlite Medical Technology Ltd | London | 2017 |
| Carbrey Accommodation Ltd | Cheltenham | 2015 |
| Carbrey Care Hempsted Ltd | Cheltenham | 2020 |
| Carbrey Care Ltd | Cheltenham | 2014 |
| Carbrey Housing Ltd | Cheltenham | 2011 |
| Carbungco Ltd | Salford | 2023 |
| Carby Shelly Elizabeth 0955 Limited | Huddersfield | 2014 |
| Carcel Ltd | Witney | 2019 |
| Carchar Limited | Grimsby | 2021 |
| Card Factory Foundation | Wakefield | 2018 |
| Cardale Care Limited | Bath | 2009 |
| Cardale PFI Management Limited | Preston | 2004 |
| Cardea Medical Network Ltd | London | 2023 |
| Cardea Resourcing Limited | Leicester | 2009 |
| Cardecho Limited | Boston | 2017 |
| Carden Healthcare Services Limited | Thame | 2018 |
| Carden Place Dental Practice Limited | Aberdeen | 2011 |
| Carder Radiology Ltd | Wilmslow | 2024 |
| Cardero 72 Ltd | Sheffield | 2024 |
| Cardia. London Ltd | London | 2016 |
| Cardiac 126 Ltd | Hessle | 2023 |
| Cardiac ANB Limited | Nottingham | 2023 |
| Cardiac and Thoracic Surgery UK | Eastleigh | 2011 |
| Cardiac AP Ltd | Harrow | 2019 |
| Cardiac Arrest Remedial Support Ltd | Bracknell | 2023 |
| Cardiac Booking Ltd | Hinckley | 2026 |
| Cardiac Care Ireland | Newry | 2022 |
| Cardiac Care London Limited | Watford | 2023 |
| Cardiac Care Services Ltd | Leigh-On-Sea | 2003 |
| Cardiac Care UK Ltd | Slough | 2023 |
| Cardiac Chambers Limited | Chester | 2012 |
| Cardiac Consultancy Ltd | London | 2010 |
| Cardiac Consultancy Services Limited | North Ferriby | 2022 |
| Cardiac Consultants Limited | Manchester | 2012 |
| Cardiac Consultation Limited | Prenton | 2014 |
| Cardiac Consulting Ltd | Leicester | 2018 |
| Cardiac Diagnostic Group Ltd | Surrey | 2024 |
| Cardiac Diagnostic Network Ltd. | Enfield | 2011 |
| Cardiac Diagnostic Services Ltd | Lisburn | 2022 |
| Cardiac Diagnostic Solutions Limited | Leicester | 2025 |
| Cardiac Diagnostic Testing Ltd | Middx | 2005 |
| Cardiac Dpow Limited | Hessle | 2016 |
| Cardiac Electrophysiology Limited | Bury | 2011 |
| Cardiac Health and Performance Limited | Bristol | 2017 |
| Cardiac Health Diagnostics Limited | Chepstow | 2015 |
| Cardiac Health Ltd | Pinner | 2014 |
| Cardiac Health Specialist Limited | London | 2026 |
| Cardiac Intervention Limited | Northwood | 2010 |
| Cardiac Investigations Diagnostic Ltd | London | 2022 |
| Cardiac Measurements Limited | Derby | 2024 |
| Cardiac Physiologist Ltd | Belfast | 2024 |
| Cardiac Physiology Ltd | London | 2015 |
| Cardiac Physiology Services Ltd | Stockport | 2025 |
| Cardiac Rehab Ltd | Berkhamsted | 2012 |
| Cardiac Remote Management Ltd | Wirral | 2018 |
| Cardiac Rhythm Health Ltd | Wirral | 2023 |
| Cardiac Rhythm Management South Yorkshire Limited | Leeds | 2023 |
| Cardiac Risk in the Young | Leatherhead | 1995 |
| Cardiac Services Ltd | Ellesmere Port | 2022 |
| Cardiac Solutions South West Limited | Newton Abbot | 2019 |
| Cardiac Stitch Ltd | Bury St. Edmunds | 2024 |
| Cardiac Support Services Ltd | London | 2024 |
| Cardiac Surgery GK Ltd | Oxford | 2019 |
| Cardiac Technical Services Limited | Bath | 2018 |
| Cardiarhythm Ltd | Holmfirth | 2021 |
| Cardicare Radiology Ltd | London | 2023 |
| Cardiff & Vale Caring 4 U Limited | Barry | 2015 |
| Cardiff & Vale of Glamorgan Parents Federation (Learning Disabilities) | Cardiff | 1995 |
| Cardiff Bay Care Ltd | Cardiff | 2025 |
| Cardiff Care Limited | Cardiff | 2023 |
| Cardiff Chiropractic Care Limited | Cardiff | 2026 |
| Cardiff Clear Aligners Ltd | Newport | 2023 |
| Cardiff Cosmetic Clinic Ltd | Stevenage | 2017 |
| Cardiff ENT Ltd | Wembley | 2024 |
| Cardiff Eyes Ltd | Cardiff | 2024 |
| Cardiff Gynaecologists Limited | Cardiff | 2011 |
| Cardiff Hand Surgery Limited | Cardiff | 2007 |
| Cardiff Homecare Ltd | Newport | 2012 |
| Cardiff Homecare Services Ltd | Colchester | 2015 |
| Cardiff Knee Surgery Limited | Vale Of Glamorgan | 2009 |
| Cardiff Lifestyle Medicine Ltd | Cardiff | 2025 |
| Cardiff Medical Consulting Limited | Cardiff | 2017 |
| Cardiff Mind Ltd. | | 1993 |
| Cardiff Multi Speciality Clinic and Diagnostics Limited | Cardiff | 2022 |
| Cardiff Paediatrics Limited | Bridgend | 2012 |
| Cardiff Pain & Performance Ltd | Cardiff | 2019 |
| Cardiff Pain and Wellness Clinic Ltd | Penarth | 2023 |
| Cardiff Physiotherapy Clinic Ltd | Cardiff | 2025 |
| Cardiff Remedy Centre Limited | Cardiff | 2016 |
| Cardiff Rheumatology Services Limited | Swansea | 2018 |