| Clacher Holdings Limited | Darlington | 2021 |
| Clack Holdings Ltd | Hove | 2022 |
| Clackmannanshire Schools Education Partnership (Holdings) Limited | Maidenhead | 2006 |
| Clackmannanshire Schools Education Partnership Limited | Maidenhead | 2006 |
| Clad Limited | Newcastle | 1964 |
| Cladagh Limited | Belfast | 2012 |
| Cladam Holdings Ltd | Nottingham | 2026 |
| Cladar Financial Ltd | Southport | 2011 |
| Cladco Group Holdings Limited | Glasgow | 2000 |
| Cladco Holdings Limited | Bideford | 2023 |
| Claddach Holdings Ltd | Paisley | 2022 |
| Claddagh Holdings Limited | Bromley | 2022 |
| Cladding & Sheeting Limited | Malton | 2014 |
| Cladproof Holdings Limited | Pudsey | 2025 |
| Cladtech Holdings Limited | Farnborough | 2026 |
| Clady Group Ltd | Antrim | 2021 |
| Claggan Limited | Brentwood | 2021 |
| Claim 4 Misleading Financial Advice Limited | Leeds | 2019 |
| Claim 8 Ltd | Glasgow | 2016 |
| Claim Acquisition Partners Ltd | Poole | 2026 |
| Claim Consultants Direct Ltd | Belfast | 2020 |
| Claim Link UK Ltd | Manchester | 1999 |
| Claim Makers Limited | Hemel Hempstead | 2017 |
| Claim Reaction Adjusting Ltd | Belfast | 2013 |
| Claim Simple Ltd | Crewe | 2018 |
| Claim Smart Legal Ltd | Knutsford | 2009 |
| Claim Solution Corp Limited | Swansea | 2022 |
| Claim Surgeons Ltd | West Bromwich | 2023 |
| Claim Wheels Ltd | London | 2023 |
| Claim Xtra Ltd | Belfast | 2021 |
| Claim Your Refund Ltd | Herne Bay | 2024 |
| Claim Yours Limited | Baschurch | 2007 |
| Claim-Blitz UK Ltd | Ashford | 2025 |
| Claim-Smart Limited | London | 2020 |
| Claimaster 123 Ltd | Salford | 2024 |
| Claimback Group Ltd | London | 2026 |
| Claimguard Ltd | London | 2024 |
| Claimly Ltd | Thornton Heath | 2025 |
| Claimrite Limited | Swansea | 2013 |
| Claims (London) Limited | London | 2011 |
| Claims 4 Business Limited | Handforth | 2022 |
| Claims Angel Ltd | Macclesfield | 2011 |
| Claims Assist Norfolk Ltd | London | 2024 |
| Claims Care Consultants Ltd | Carlisle | 2016 |
| Claims Connexion (UK) Limited | Swansea | 2002 |
| Claims Consortium Adjusting Limited | Taunton | 2019 |
| Claims Consultancy Club Limited | Glasgow | 2015 |
| Claims Equilibrium Club Limited | Glasgow | 2003 |
| Claims Gate Global Ltd | London | 2025 |
| Claims Gate Invest Ltd | London | 2025 |
| Claims Handling AS a Service Limited | Beaconsfield | 2020 |
| Claims Inspection Services Ltd | Newcastle Upon Tyne | 2016 |
| Claims Legal Ltd | Manchester | 2010 |
| Claims Management and Adjusting Limited | Birmingham | 1994 |
| Claims Management Services Limited | London | 2001 |
| Claims Recovery Group Ltd | Brighton | 2025 |
| Claims Services International Limited | Surrey | 1991 |
| Claims Settlement Agencies Limited | London | 1990 |
| Claims SME Limited | South Woodham Ferrers | 2021 |
| Claims TEC Limited | Belfast | 2019 |
| Claims World Intel Ltd | Liverpool | 2024 |
| CLAIMS4GAP Ltd | London | 2025 |
| Claimscare Management Ltd | Stockport | 2025 |
| Claimscog Limited | Brighton | 2020 |
| Claimsforce Ltd | Colchester | 2016 |
| Claimsline Group Ltd | Manchester | 2014 |
| Claimsure Ltd | London | 2019 |
| Claimvis Ltd. | London | 2023 |
| Claimwhys Limited | Kings Langley | 2010 |
| Clair Investment Holdings Limited | Birmingham | 2025 |
| Clair Owen Holdings Limited | Clay Cross | 2026 |
| Claire Capital Partners Limited | Loughton | 2025 |
| Claire Clegg Mortgages Ltd | Ashton-Under-Lyne | 2026 |
| Claire Creed Mortgages Ltd | Norwich | 2022 |
| Claire Errington Limited | Newcastle Upon Tyne | 1958 |
| Claire Hogg Mortgages & Protection Limited | Richmond | 2019 |
| Claire Lipscomb Mortgages Ltd | Brighton | 2023 |
| Claire Lowe Ltd | Mansfield | 2022 |
| Claire Richards Design Ltd | Bath | 2020 |
| Claire Scott & PA Holding Ltd | London | 2024 |
| Clairmont 10 Ltd | Glasgow | 2025 |
| Clairville York Ltd | Birmingham | 1987 |
| Clairvoyance Actuarial Ltd | Orpington | 2014 |
| Claiser Trading Ltd | London | 2018 |
| Claith Holdings Limited | Wilmslow | 2025 |
| Clam Holdings Ltd | Milton Keynes | 2022 |
| Clamason Group Holdings Limited | Kingswinford | 2015 |
| Clambertine (Management) Limited | Cirencester | 2012 |
| Clamp Holdings Ltd | Hawick | 2022 |
| Clamp N Seize Ltd | Basildon | 2022 |
| Clamshell Capital Limited | London | 2024 |
| Clan (Judd Street) Limited | London | 2020 |
| Clan (Regent W1) Limited | London | 2017 |
| Clan (Romney Marsh) Limited | Ashford | 2017 |
| Clan Asset Finance Ltd | Mayfield | 2023 |
| Clan Equity Limited | London | 2021 |
| Clan Financial Services Limited | Plymouth | 2008 |
| Clan Harper Holdings Ltd | Huntingdon | 2025 |
| Clan Holdings (Ireland) Ltd | Ayr | 2026 |
| Clan Leasing Solutions Ltd | Mayfield | 2025 |