| Calepark Limited | Leeds | 1997 |
| Caletten Limited | Gloucester | 2022 |
| Caley Home Care Ltd | Edinburgh | 2014 |
| Cali Healthcare Ltd | Sutton | 2014 |
| Caliber Medical Services Ltd | Rugby | 2016 |
| Calibre Commercial Ltd | Shrewsbury | 2013 |
| Calibre Healthcare Ltd | Watford | 2016 |
| Calibre Rehabilitation Services Ltd | Bolton | 2018 |
| Calibre Specialists Care Limited | Woodford Bridge | 2014 |
| Calica Consultants Ltd | Dagenham | 2011 |
| Calico Enterprise Limited | Burnley | 2007 |
| Calico Healthcare Limited | Tamworth | 2023 |
| Calico Wellbeing Ltd | Port Sunlight | 2025 |
| Calida Care Ltd | Basingstoke | 2019 |
| California House Limited | Weybridge | 2025 |
| Calinga Limited | Worthing | 2022 |
| Calisacare Limited | Sevenoaks | 2018 |
| Caliscare Limited | Liverpool | 2025 |
| Calisen Impact Charitable Trust | Manchester | 2023 |
| Calistaa 1 Limited | London | 2017 |
| Calistaa Limited | London | 2016 |
| Calisthan Ltd | Bury | 2022 |
| Calithea Ltd | Coventry | 2015 |
| Calix Mobile Health Ltd | London | 2026 |
| Call 2 Support Services Ltd | Leicester | 2025 |
| Call 2 Train Ltd | Leicester | 2020 |
| Call a GP Ltd | Woking | 2013 |
| Call Care for YOU Ltd | Aylesbury | 2024 |
| Call Fast Business Ltd | London | 2016 |
| Call for Company Limited | Birmingham | 2026 |
| Call for Duty | Sheffield | 2018 |
| Call Healthcare Limited | London | 2024 |
| Call Help Support Ltd | Pudsey | 2025 |
| Call HER Aesthetics Ltd | Keighley | 2025 |
| Call Lane Aesthetics Limited | Leeds | 2013 |
| Call ME Care Ltd | Uxbridge | 2023 |
| Call Pall Limited | Manchester | 2020 |
| Call Plus | Manchester | 1992 |
| Call Point Healthcare Ltd | Leeds | 2014 |
| Call to Scan Ltd | Greenford | 2025 |
| Call US Dental Spa Limited | Widnes | 2019 |
| Call-In Homecare Limited | Edinburgh | 1995 |
| CALL4CARE Ltd | London | 2016 |
| CALL4CARE Services Limited | Milton Keynes | 2015 |
| Calla Aesthetics Limited | Derby | 2008 |
| Calla Lily Health Limited | London | 2023 |
| Callaghan Medical Services Limited | Denmead | 2024 |
| Callaghan-Hayes Ltd | Newcastle | 2013 |
| Callan River Ltd | Newtownabbey | 2022 |
| Callander Physiotherapy Ltd | Callander | 2025 |
| Callaway Care and Support Limited | Wembley | 2019 |
| Calldoc Ltd | Luton | 2025 |
| Called 2 Care Companions Ltd | Bury St. Edmunds | 2026 |
| Called to Care Companionship Ltd | Swansea | 2025 |
| Callen Olive Podiatry Limited | Milton Keynes | 2016 |
| Calli Supported Housing Ltd | Dudley | 2025 |
| Callie Private Ltd | Darlington | 2016 |
| Callington Town Forum Community Interest Company | Callington | 2016 |
| Callison Dent Limited | Eastbourne | 2024 |
| Callista Healthcare Ltd | Bicester | 2014 |
| Callisto Health Ltd | Shetland | 2023 |
| Callisto Healthcare Ltd | London | 2011 |
| Callisto Medical Ltd | Eastbourne | 2025 |
| Calljana Ltd | Wigan | 2025 |
| Callquest for Care Limited | Sevenoaks | 2017 |
| Callthedoc Limited | Bolton | 2025 |
| Callum James Mcquade Ltd | Kilmarnock | 2025 |
| Callum Mccandless Ltd | Banbridge | 2023 |
| Callum Repper Limited | Romford | 2016 |
| Callum Wheeler Consultancy Ltd | Swansea | 2021 |
| Callum Wilson Ltd | Lisburn | 2013 |
| Calluna Care Ltd | London | 2021 |
| Calluna Medical Limited | Wilmslow | 2018 |
| Calluna Skin Limited | London | 2026 |
| Calluna Wholesale Limited | Wilmslow | 2015 |
| Callvalley Limited | Weymouth | 2006 |
| Callwood Case Management Ltd | Altrincham | 2025 |
| Cally Private Limited | Aldershot | 2018 |
| Cally Smith Childcare Ltd | Darlington | 2020 |
| Callyhaze Significance Limited | Northampton | 2024 |
| Callywhyt Limited | Slough | 2024 |
| Cally’S Consulting Limited | Warrington | 2025 |
| Calm & Bright Limited | Bournemouth | 2014 |
| Calm & Gentle Dental Care, Rustington Limited | Tonbridge | 2015 |
| Calm & Gentle Dental Care, Tonbridge Limited | Tonbridge | 2007 |
| Calm + Chaos Ltd | Addlestone | 2024 |
| Calm After 50 Limited | Bury St. Edmunds | 2025 |
| Calm Ahead Community Interest Company | Oldham | 2023 |
| Calm Amid Chaos Therapy Limited | Bristol | 2024 |
| Calm and Centred C.I.C. | Leeds | 2015 |
| Calm and Chaos Collective Ltd | Dundee | 2024 |
| Calm and Connect Therapy CIC | London | 2024 |
| Calm and Grow CIC | Houghton Le Spring | 2025 |
| Calm Body Ltd | Stockport | 2019 |
| Calm Care Solutions Ltd | London, United Kingdom | 2022 |
| Calm Cats Ltd | Norwich | 2019 |
| Calm Coffee Group CIC | Chester | 2023 |
| Calm Comfort Ltd | Dunstable | 2026 |
| Calm Connections CIC | Stretford | 2018 |
| Calm Cosmetic Skin Care Clinic Ltd | Newry | 2017 |