| CK Reynolds Consultants Ltd | Halifax | 2024 |
| CK Soccer Coaching Ltd | Lisburn | 2022 |
| CK Tuition and Education Limited | Warrington | 2026 |
| CK Tutoring Ltd | Hitchen | 2024 |
| CK9 Dog Training Ltd | Capel | 2023 |
| CK9 Online Academy Ltd | Banstead | 2023 |
| CKA Driving School Ltd | Edgware | 2026 |
| CKC EP Services Limited | Belper | 2025 |
| Ckee Sports Ltd | Manchester | 2015 |
| CKL Training Ltd | Liverpool | 2007 |
| Ckld Limited | Kidderminster | 2022 |
| Ckma Karate Ltd | Stratford Upon Avon | 2023 |
| Ckmv Ltd | St. Albans | 2017 |
| CKP Training Ltd | Wigan | 2023 |
| Cksquared Ltd | Hemel Hempstead | 2025 |
| CKT Training Limited | Spennymoor | 2023 |
| CL Fitness Ltd | Doncaster | 2024 |
| CL Global Group Ltd | King'S Lynn | 2015 |
| CL02 Education Services Limited | Lanark | 2023 |
| CLA Enterprises Limited | Cheltenham | 2022 |
| Clac Limited | Cambridge | 2007 |
| Clacton Montessori Day Nursery and Preschool Limited | London | 2012 |
| Claim the Future Ltd | London | 2020 |
| Claiming Space CIC | London | 2017 |
| Claims Consortium Training Limited | Taunton | 2019 |
| Clair Townsend Ltd | Birmingham | 2023 |
| Claire AA Smith Psychology Ltd | Swansea | 2025 |
| Claire and Oscar Productions Ltd | Edinburgh | 2022 |
| Claire Ball Limited | Walsall | 2022 |
| Claire Basden Ltd | Watlington | 2013 |
| Claire Bears Ltd | London | 2021 |
| Claire Bradshaw Associates Limited | High Peak | 2018 |
| Claire Briggs Educational Psychologist Limited | Newton Aycliffe | 2024 |
| Claire Calder Consultancy Limited | Gloucester | 2022 |
| Claire Dorby Psychology Limited | Kilmarnock | 2025 |
| Claire Gregory Consultancy Ltd | Warrington | 2025 |
| Claire Jeffrey Digital Ltd | London | 2023 |
| Claire Lillis Associates Limited | London | 2021 |
| Claire Morrell Limited | Esher | 2013 |
| Claire Murphy Coaching Limited | Irvine | 2025 |
| Claire Rider Education Services Ltd | Marlow | 2025 |
| Claire Rivers Ltd | Whitley Bay | 2024 |
| Claire Warden Limited | Crieff | 2012 |
| Claire Whitehouse Learning Limited | Bromsgrove | 2014 |
| Claire's Cheeky Cherubs Ltd | Spalding | 2012 |
| Claire's Club Ltd | Hemel Hempstead | 2015 |
| Claire's School Solutions Limited | Belper | 2015 |
| Claires Court Schools Limited | Ascot | 1998 |
| Clan Conacher Society CIC | Dunning | 2020 |
| Clan Language Schools Ltd | Edinburgh | 2023 |
| Clan Ritchie Training Ltd | Lochwinnoch | 2014 |
| Clan Weir Society C.I.C. | Dunning | 2020 |
| Clancy Briggs Cycling Academy CIC | Retford | 2019 |
| Clandara Limited | Ellesmere Port | 2023 |
| Clap and Toot Ltd | London | 2020 |
| Clap Sticks Ltd | London | 2026 |
| Clapham Driving School Ltd | London | 2016 |
| Clapham Pottery Limited | London | 2006 |
| Clapham Tutors Ltd | London | 2024 |
| Clapping Hands CIC | London | 2024 |
| Clapton Girls' Academy Trust | London | 2011 |
| Clara Consultancy Ltd | London | 2025 |
| Clara James Tutoring Ltd | Aylesbury | 2013 |
| Claran Holdings Ltd | Manchester | 2018 |
| Clare Abbott Eventing Ltd | Hillsborough | 2025 |
| Clare Bears Community Pre-School Limited | Sudbury | 2017 |
| Clare Considine Education Limited | Coventry | 2013 |
| Clare Crump Mindset Coaching Ltd | Bridgnorth | 2026 |
| Clare Devlin Education Consultancy Ltd | Magherafelt | 2026 |
| Clare House Independent School Trust Limited | Porthcawl | 2025 |
| Clare Mcbride Educational Consultancy Limited | London | 2026 |
| Clare Smith Kingston Dyslexia Services Ltd | Kingston Upon Thames | 2016 |
| Clare Stringer Ltd | Bury St. Edmunds | 2021 |
| Claremont Early Years Limited | Retford | 2002 |
| Claremont FAN Court Foundation Limited(The) | Esher | 1976 |
| Claremont Healing Arts Ltd | London | 2025 |
| Claremont School (ST. Leonards) Limited | London | 1993 |
| Clarence & Avondale C.I.C. | Edinburgh | 2025 |
| Clarence Education Ltd | London | 2016 |
| Clarence Green College Ltd | Romford | 2022 |
| Clarendon College Limited | Formby | 2006 |
| Clarendon Cottage School Limited | Manchester | 2000 |
| Clarendon International Education Limited | Oxford | 1994 |
| Clarendon Nursery Ltd | Formby | 2016 |
| Clarendon Welfare Centre Ltd | Manchester | 2024 |
| Clares Driving School Ltd | Huntingdon | 2025 |
| Clari Health Ltd | Doncaster | 2026 |
| Clarify Training Limited | Winchester | 2003 |
| Clarion Corvus Trust | Norwich | 2013 |
| Clarion Education Limited | Solihull | 2024 |
| Clarion International College Ltd | London | 2025 |
| Clarisity Accountancy Ltd | London | 2020 |
| Clarissa Farr Consulting Limited | Barnet | 2019 |
| Clarita Consultancy Limited | Ashford | 2016 |
| Claritas Tutoring Group Limited | Cheadle | 2025 |
| Clarity & Solutions Ltd | London | 2019 |
| Clarity Academics Ltd | Cheadle | 2026 |
| Clarity Coaching School Limited | London | 2026 |
| Clarity ED Ltd | London | 2025 |
| Clarity Education Ltd | Robertsbridge | 2023 |