| Callander Leisure Limited | Callander | 2011 |
| Callaway Studio Ltd | Watford | 2026 |
| Calledout Sports Ltd | Eastbourne | 2021 |
| Callerigroup UK Limited | London | 2015 |
| Calleva Bloodstock Limited | Hurst | 2015 |
| Calliandra Productions Limited | Trowbridge | 1995 |
| Callosum Entertainment Ltd | Leicester | 2026 |
| Calloused Mind Fitness Ltd | Lochgilphead | 2024 |
| Callovian Gundogs Ltd | Tetbury | 2026 |
| Callum Burrows PT Ltd | London | 2026 |
| Callum Deakin MMA Ltd | Wolverhampton | 2025 |
| Callum Eaton Ltd | Bath | 2023 |
| Callum Gorniak Limited | Manchester | 2026 |
| Callum Green Studio Limited | London | 2026 |
| Callum Macleod Racing Ltd | Northampton | 2015 |
| Callum Pritchard Racing Ltd | Abingdon | 2025 |
| Callum Smith Boxing Ltd | Liverpool | 2013 |
| Callumabroad Group Ltd | London | 2025 |
| Callumsnutritionacademy Ltd | New Malden | 2026 |
| Cally Direct Ltd | St. Helens | 2022 |
| Cally Jane Limited | Bedford | 2019 |
| Calm & Core Pilates Ltd | Motherwell | 2025 |
| Calm Eagle Sports Limited | Brighton | 2018 |
| Calm Frog Ltd | Biggleswade | 2021 |
| Calm Movers CIC | Swansea | 2026 |
| Calm Palm Limited | Milton Keynes | 2024 |
| Calm Pelican Ltd | Doncaster | 2025 |
| Calma Creative Ltd | London | 2023 |
| Calmababy Limited | Peterborough | 2010 |
| Calmer Karma Limited | Evesham | 2000 |
| Calmet Limited | London | 1979 |
| Calmsound Limited | Bridport | 2010 |
| Calmwater Bay Water SKI and Wake Board Club Ltd | York | 2021 |
| Calne Bowls Club Ltd | Wiltshire | 2020 |
| Calne Recreation Club Limited | Calne | 2002 |
| Calne Tennis Club Limited | Calne | 2017 |
| Calne Town FC Ltd | Calne | 2009 |
| Calokiro Limited | Braintree | 2016 |
| Calran 0701 Limited | Glasgow | 2014 |
| Cals Aesthetic Ltd | Solihull | 2024 |
| Cals Cafe Ltd | Belfast | 2025 |
| Calstock Arts Limited | Calstock | 2009 |
| Caltec Limited | Stevenage | 2025 |
| Caltex Services (U.K.) Limited | | 1937 |
| Calton Moor Flyers Club Limited | Ashbourne | 2002 |
| Calum C Photography Limited | Edinburgh | 1999 |
| Calum French Boxing Coach Community Interest Company | Wirral | 2025 |
| Calum French Boxing Ltd | Ipswich | 2021 |
| Calum Lawson Golf Ltd | Strathaven | 2018 |
| Calum Ltd | London | 2010 |
| Calum Raistrick Online Consultancy Ltd | London | 2020 |
| Calum Torbett Creative Ltd | Skipton | 2024 |
| Calverley Golf Club Limited | Brighouse | 1985 |
| Calverton Gymnastics Club | Nottingham | 2017 |
| Calvin Charles Limited | London | 2015 |
| Calvin Crook Personal Training Ltd. | St Neots | 2007 |
| Calvin Haggis Limited | Aberdeen | 2025 |
| Calvin Racing & Betting Limited | Watford | 2016 |
| Calvin Sports Management Group UK Ltd | Manchester | 2021 |
| Calypso Bene Limited | Redhill | 2023 |
| Calypso Cricket Coaching Ltd | London | 2020 |
| Calypso Gymnastics CIC | Enfield | 2023 |
| Calypso Gymnastics Club Ltd | Enfield | 2022 |
| CAM (the Wharf) Ltd | Devon | 1996 |
| CAM Amusement Limited | Belfast | 2009 |
| CAM Boathouse Company Limited(The) | Cambridge | 1959 |
| CAM Brannagan Football Academy Limited | Stanmore | 2023 |
| CAM Ceylon Ltd | Edgware | 2025 |
| CAM Mackintosh Limited | London | 2026 |
| CAM Peak Music Festival Limited | Gloucester | 2026 |
| CAM Sports Club | Dursley | 2017 |
| CAM Sports Club (Trading) Limited | Cam | 2018 |
| CAM Sports Performance Ltd | Cambridge | 2023 |
| CAM Valley Sports Club Limited | Radstock | 2019 |
| Cam's Comps Ltd | Exeter | 2025 |
| Camara & Alves Sports Management Ltd | Norwich | 2022 |
| Camber Lawn Tennis Club Limited | London | 2016 |
| Camber Sounds Ltd | Fareham | 2022 |
| Camberley & Farnborough Hockey Club Ltd | Farnborough | 2020 |
| Camberley Gymnastics Club | Aldershot | 1987 |
| Camberley Heath Limited | Surrey | 2003 |
| Camberley Kart Club Limited | Cranleigh | 1994 |
| Camberley Town F.C. Limited | Camberley | 1996 |
| Camberwell Art Services Ltd | London | 2025 |
| Camberwell Arts Limited | London | 2001 |
| Camberwell Carnival CIC | London | 2025 |
| Cambiata Ltd | Salisbury | 2024 |
| Cambo Heritage Trust | St Andrews | 2014 |
| Camborne Rugby Football Club Limited | Camborne | 2013 |
| Camborne Town Band Music Society | Camborne | 2009 |
| Camborne Trevithick Day CIC | Camborne | 2024 |
| Cambrensis Communications Limited | Cardiff | 1989 |
| Cambria Events Crew Ltd | Cardiff | 2023 |
| Cambrian Aquatics C.I.C. | Deeside | 2015 |
| Cambrian Community Centre | Richmond | 2012 |
| Cambrian Flying Group Ltd | Worcester | 2004 |
| Cambrian Funfair Limited | Manchester | 2019 |
| Cambrian Lakeside Ltd | Tonypandy | 2013 |
| Cambrian Rally Ltd | Llandudno Junction | 2021 |
| Cambrian United FC Limited | Clydach Vale | 2024 |