| Carelifeline Recruitment & Training Ltd | Slough | 2025 |
| Carelinks Healthcare Ltd | Bradford | 2023 |
| Careluna Services Ltd | London | 2025 |
| Carelytical Home Care Ltd | Accrington | 2021 |
| Carenest Wellbeing Services Ltd | Hatfield | 2026 |
| Carepersonalised Limited | London | 2023 |
| Careplan First Ltd | London | 2023 |
| Careplus Solutions Limited | Ilford | 2025 |
| Careprosolution Ltd | London | 2018 |
| Carers Team Ltd | Bradford | 2025 |
| Carers Worldwide | Welwyn Garden City | 2012 |
| CARERS4ALL Ltd | Derby | 2023 |
| CARERS4CARING Ltd | Slough | 2023 |
| Cares and Consulting Ltd | Thornton Heath | 2024 |
| Cares Connections Ltd | Fleetwood | 2025 |
| Cares Fire Safety Ltd | Wellington | 2023 |
| Caresara Ltd | Leatherhead | 2024 |
| Caresolutions International Healthcare Ltd | Bolton | 2025 |
| Caretm Limited | Truro | 2018 |
| Careupp Limited | Wellingborough | 2024 |
| Carewise Healthcare Group Ltd | London | 2024 |
| Carey Fire Safety Limited | Sidcup | 2025 |
| Caring Bridge Care Agency Ltd | Bristol | 2024 |
| Caring Brothers Foundation | Calne | 2014 |
| Caring Crest Limited | Rainham | 2022 |
| Caring for Next Generations Ltd | London | 2022 |
| Caring Haven Homes Ltd | Hornchurch | 2024 |
| Caring Partners Healthcare Ltd | Trowbridge | 2020 |
| Caring Plus Limited | Manchester | 2022 |
| Caring Steps Ltd | Wolverhampton | 2021 |
| Caring@Home Ltd | Swindon | 2020 |
| Caringfirst Limited | London | 2020 |
| CARINGHEALTH2U Limited | London | 2025 |
| Caringwave Ltd | Manchester | 2024 |
| Carlton Business Associates Limited | Carlisle | 2023 |
| Carltonlima Care Ltd | Poole | 2023 |
| Carlyssocials Ltd | Lowestoft | 2026 |
| Carns Health Care 2 Limited | Birmingham | 2025 |
| Caroline 123 Limited | Manchester | 2022 |
| Caroline Middleton Assessments Ltd | Birmingham | 2022 |
| Carry on Caring Ltd | Brighton | 2021 |
| Carte Blanche Subsidiary Ltd | London | 2023 |
| Casa Health London Ltd | London | 2024 |
| Cascade Aviation & Marine Ltd | Leicester | 2022 |
| Case Management CHC Limited | Stevenage | 2021 |
| Casey’S Locums Ltd | Stockport | 2023 |
| Casio Power Limited | Luton | 2024 |
| Casper Fire Solutions Ltd | Scarborough | 2024 |
| Cassia Health Ltd | Towcester | 2020 |
| Cassy Consultancy Ltd | Stockport | 2020 |
| Cassy.Health Ltd | Watford | 2025 |
| Castle Chiropractic Centre Ltd | Chepstow | 2024 |
| Castle Fire Limited | Kendal | 2001 |
| Castle Fire Protection Services Ltd | Doncaster | 2026 |
| Castle Fire Services Ltd | Dudley | 2021 |
| Castlemoore Quality Care Ltd | Gravesend | 2021 |
| Catalan Tourist Board UK and Ireland Limited | London | 2022 |
| Catalonia Trade & Investment London Limited | London | 2021 |
| Cater Safe Limited | Oldham | 2021 |
| Catharsis Creative Arts Therapy Ltd | Nottingham | 2015 |
| Catherine COX Consultancy Limited | Wimborne | 2024 |
| Catherine's Care Services Ltd | Brechin | 2026 |
| Catholic Safeguarding Agency Limited | London | 2021 |
| Cathy Healthcare Ltd | Eastbourne | 2018 |
| Cattolico Intelligence Ltd | Cardiff | 2018 |
| Causeway Rescue Ltd | Belfast | 2020 |
| Cava Brent CIC | London | 2025 |
| Cavendish Home Care Ltd | Ashington | 2019 |
| Cavl CIC | London | 2025 |
| CB Defence and Strategy Consulting Ltd | Melton Mowbray | 2025 |
| CB Fire & Security Ltd | Glasgow | 2024 |
| CBD Consultancy Limited | Caldicot | 2019 |
| CBM Fire and Risk Protection Limited | Thornton Cleveleys | 2025 |
| CBT4ME Ltd | London | 2020 |
| CC Fire Safety Ltd | Downpatrick | 2026 |
| Ccaa Ltd | London | 2021 |
| Ccase Ltd | London | 2026 |
| CCS Training (Care) Limited | Newcastle Upon Tyne | 2025 |
| CD Fire & Safety Consultancy Ltd | London | 2022 |
| CD Surgical Ltd | London | 2023 |
| Cd&M Solutions Limited | Wirral | 2008 |
| CDL Training and Event Medical Services Ltd | Shepton Mallet | 2025 |
| CDM Associates Ltd | Sutton Coldfield | 2015 |
| CDM Offshore Services Ltd | Borehamwood | 2016 |
| CDN Consular Services Limited | Ashford | 2010 |
| CE Marking Services Limited | Cinderford | 2005 |
| CE North Ltd | Stalybridge | 2018 |
| Ceasefire PFP Ltd | Nottingham | 2019 |
| CEC Fire Ltd | Coventry | 2026 |
| Ceccare Limited | London | 2022 |
| Cedars Company Expert Limited | Tilbury | 2024 |
| Cedarwood Care and Support Ltd | Corby | 2025 |
| CEE & M Healthcare Limited | Luton | 2022 |
| Celage Services Ltd | Stansted | 2019 |
| Celeazm Limited | Dartford | 2018 |
| Celestial Healthcare Limited | Biggleswade | 2022 |
| Celtic Health Ltd | Swansea | 2020 |
| Celtic NW Group Ltd | Caernarfon | 2026 |
| Centauri Health Limited | Ashford | 2021 |
| Center of Care Limited | Thetford | 2024 |