| Calvert Sporting LimitedBridport, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2016 |
| Cambrian Drinks LtdNewtown, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2023 |
| Cambridge Champagne Company LimitedCambridge, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2017 |
| Campbells of Beauly LimitedBeauly, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2014 |
| Campden Investments LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1993 |
| Cape Wine & Food LimitedStaines-upon-Thames, United Kingdom · UKcapewineandfood.com · checked 28 Oct 2026 | UK | 1 | – | – | – | – | 2013 |
| Caper and Cure LtdBristol, United Kingdom · UKcaperandcure.co.uk · checked 28 Oct 2026 | UK | 1 | – | – | – | – | 2019 |
| Capricci For London LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2014 |
| Capula Investment Services LtdReading, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2005 |
| Carrasco & Carrasco LimitedChelmsford, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2011 |
| Cartell UK LtdCorby, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2008 |
| Cartier LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1919 |
| Casa Cruz London LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2014 |
| Castle Mclellan Foods LtdKirkcudbright, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1982 |
| Castlechain LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1983 |
| Catalytic Technologies LtdBillingham, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2010 |
| Cathay Importers LtdLondon, United Kingdom · UKcathayimporters.co.uk · checked 28 Oct 2026 | UK | 1 | – | – | – | – | 1973 |
| Cavendish Nuclear LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2005 |
| Celtic Wines LtdPembroke Dock, United Kingdom · UKcelticwines.com · checked 28 Oct 2026 | UK | 1 | – | – | – | – | 2003 |
| Centrepoint International Services LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2008 |
| Centurion Golf PLCAscot, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2012 |
| Ceva Ground Logistics UK LtdAshby de la Zouch, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1981 |
| Chalkhaven LtdRuislip, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2025 |
| Charbonnel et Walker LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1920 |
| Charles Edge London LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1999 |
| Charles River LtdKent, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1969 |
| Charlie Delta LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2023 |
| Charlie Herring LtdLymington, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2005 |
| Charter Brands LimitedTorquay, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2011 |
| Chase Restaurants LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2004 |
| Chelsea Fc Holdings LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1990 |
| Chew Valley Distillery LtdBristol, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2020 |
| Chez Roux LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2008 |
| Chilli LimitedStockport, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2005 |
| Chiltern Air Freight LimitedSlough, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1982 |
| Chiswick Auctions LtdTolleshunt Major, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2008 |
| Chp UK City LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2017 |
| Christeyns Food Hygiene LtdWarrington, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1989 |
| Christian Dior UK LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1993 |
| Christian Murray Financial Serviceslt DTotnes, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2001 |
| Churchill Group LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1967 |
| Ciao Roma Restaurants LimitedEdinburgh, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1996 |
| Circle13 LimitedLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2023 |
| Circulor LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2017 |
| Cisilion LtdLeatherhead, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2000 |
| Citadel Enterprise Europe LimitedUnited Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1998 |
| City District LtdHale, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2009 |
| Cl & Co. Management Services LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1986 |
| Clare College LtdCambridge, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 1992 |
| Clarkson Port Services LtdLondon, United Kingdom · UKchecked 28 Oct 2026 | UK | 1 | – | – | – | – | 2002 |