| Caley Seafoods Limited | Peterhead | 2014 |
| Calgary Consultancy Ltd | Crumlin | 2020 |
| Calgel UK Limited | Bletchley, Milton Keynes | 1999 |
| Cali Raya Revell Ltd | Droitwich | 2025 |
| Calibration & Detection Gases Ltd | Warrington | 2016 |
| Calibration Dynamics Limited | Sevenoaks | 2005 |
| Calibration GAS & Equipment Ltd | Warrington | 2016 |
| Calibre Services Limited | | 1991 |
| Caliburn Estates Ltd | Bracknell | 2025 |
| Calico Housing Ltd | Burnley | 2009 |
| California Camper Adventures Limited | Enniskillen | 2022 |
| California Dreamin Limited | London | 2025 |
| California Girl Foods Ltd | Faversham | 2012 |
| California Orange Co., Ltd. | Beckenham | 2016 |
| California Superbike School UK Ltd | Winsford | 2022 |
| Calistella Ltd | London | 2023 |
| Call Centre Management Association Limited | Godalming | 2020 |
| Call Review Limited | Wokingham | 2016 |
| Callacre Limited | Bridgend | 2026 |
| Calladines Park Homes Limited | Retford | 2014 |
| Callanetics Limited | Stockport | 1989 |
| Callbest Limited | Bridgend | 2024 |
| Calldon Limited | York | 2012 |
| Callexcept Limited | Burgess Hill | 1999 |
| Callflex (2) Limited | Salford | 2023 |
| Callflex Limited | Salford | 2023 |
| Callglass Limited | Carmarthen | 2000 |
| Callida Property Group Ltd | Wirral | 2022 |
| Calling Success Limited | London | 2021 |
| Callington Sustainable Energy Limited | London | 2017 |
| Calliper Innovations Limited | Hemel Hempstead | 2012 |
| Callis Court Management Company Limited | Broadstairs | 2003 |
| Callisto Marine Ltd | Mitcham | 2017 |
| Callous Industrial & Trade Co., Ltd | Beckenham | 2018 |
| Callow Park Management Limited | Chippenham | 2008 |
| Callspill Limited | Colchester | 2001 |
| Callsys Ltd | Purfleet | 2009 |
| Callum Honetana Oliver-Johnston Limited | London | 2024 |
| Callum JAY Mitchell Limited | Coalville | 2024 |
| Callum Mackenzie Limited | Bristol | 2008 |
| Callum Park Homes Limited | Slough | 2013 |
| Callum-Andrew Blunden Ltd | Wisbech | 2025 |
| Callus Holdings Ltd | Canterbury | 2024 |
| Callward Limited | Bridgend | 2026 |
| Cally SAW Mill Ltd | Dunkeld | 2011 |
| Calm Minds Cafe Limited | Sheffield | 2024 |
| Calm Seas Marketing Limited | Wickford | 2015 |
| Calm Slate Farm Limited | Skipton | 2013 |
| Calmac Electrical Ltd | Bristol | 2020 |
| Calmatt Holdings Limited | Livingston | 2005 |
| Calmeta Ltd | London | 2019 |
| Calming Connections Ltd | Hereford | 2023 |
| Calmreleaf Ltd | Templepatrick | 2021 |
| Calmspace Investments Limited | Windsor | 2011 |
| Calmstatus Limited | Baldock | 1995 |
| Calmworks Ltd. | Chipping Norton | 2018 |
| Calomax (Engineers) Limited | Leeds | 1999 |
| Caloy Limited | High Peak | 1960 |
| Calpe Properties Limited | Liverpool | 2006 |
| Calras Ltd. | | 2003 |
| Caltag Medsystems Trustee Limited | Buckingham | 2025 |
| Calthorpe Estates Limited | West Midlands | 2007 |
| Calton Farm Milk Limited | Buxton | 2003 |
| Calverley Interiors Limited | Tunbridge Wells | 2020 |
| Calvey Marine Holdings Limited | Chichester | 2007 |
| Calx Financial Limited | Lydney | 2025 |
| Calxeda International Trade Limited | Beckenham | 2022 |
| Calylife Ltd | West Midlands, England | 2023 |
| Calypso Bathrooms Ltd | Bristol | 2021 |
| Calypso Kitchens Ltd | Bristol | 2021 |
| Calz Limited | Newcastle Upon Tyne | 2023 |
| Calzeat Scotland Ltd | South Lanarkshire | 1969 |
| CAM Autos Ltd. | Glasgow | 2010 |
| CAM Flying Club Limited | Cirencester | 2022 |
| CAM Service Solutions Limited | Sidcup | 2014 |
| CAM Video Imaging Limited | Cambridge | 2023 |
| Cam-Watch Limited | Scunthorpe | 2020 |
| Cama Property Limited | Southend | 2021 |
| Cama Workspace Limited | London | 2020 |
| Camaan Properties Limited | London | 2008 |
| Camabatela Service Ltd | London | 2023 |
| Camamo Ltd. | London | 2023 |
| Camau Developments Limited | London | 2026 |
| Camber Civil Engineering Limited | Oldham | 2018 |
| Camber Management Limited | Epsom | 2006 |
| Camberley Development Limited | London | 2017 |
| Camberley Junior Chess Club Ltd. | Sandhurst | 2017 |
| Cambian Advanced Engineering Limited | Horsham | 2000 |
| Cambian Engineering Solutions Limited | Horsham | 2004 |
| Cambio DE Tercio Limited | London | 2000 |
| Camborne Slate Limited | Blackburn | 2014 |
| Cambourne Client Services Limited | Loughborough | 2009 |
| Cambourne Holdings Limited | Loughborough | 2009 |
| Cambrensis Holdings Limited | Abergavenny | 2023 |
| Cambria 75 Ltd | | 2007 |
| Cambria Portfolio Nominee 1 Limited | Manchester | 2018 |
| Cambria Portfolio Nominee 2 Limited | Mancheseter | 2018 |
| Cambrian Care (Powys) Limited | Uxbridge | 1999 |
| Cambrian Catering Services Limited | Swansea | 2014 |
| Cambrian Group Limited | Wotton-Under-Edge | 2008 |