| CAD CAM Projects Ltd | Milton Keynes | 2018 |
| CAD CAM Studio Ltd | Bexhill | 2025 |
| CAD Creations Limited | London | 2010 |
| CAD CUT Limited | Bristol | 1999 |
| CAD Direct Ltd | Ferndown | 2008 |
| CAD Fabrications Limited | Newport | 2002 |
| CAD Group Bespoke Joinery Ltd | Lichfield | 2021 |
| CAD Joinery Limited | Standlake | 2006 |
| CAD Luxury Homes Ltd | Waltham Abbey | 2024 |
| CAD Ninjas Ltd | Paisley | 2025 |
| CAD Printers Ltd | Wickford | 2025 |
| CAD Services Direct Limited | Stevenage | 2007 |
| CAD Technologies Limited | Royston | 2014 |
| Cad-Cam Solutions Ltd | Bournemouth | 2016 |
| Cad-Fab Limited | Leeds | 1990 |
| Cad-Man (UK) Limited | Billericay | 2013 |
| Cad-Man London Limited | Chingford | 2018 |
| Cadac Morris Ltd | Luton | 2020 |
| Cadair Bikes Limited | Tywyn | 2023 |
| Cadal Craft Ltd | Lutterworth | 2020 |
| Cadam Engineering Limited | Redditch | 2017 |
| Cadam Machinery Limited | Redditch | 2017 |
| Cadamp Limited | Burley In Wharfedale | 1997 |
| Cadbury Engineering Ltd | Romsey | 2014 |
| Cadbury Kitchens Limited | Somerset | 2003 |
| Cadbury UK Limited | Birmingham | 1919 |
| Cadcam (N.I.) Limited | Ballymena | 2019 |
| Cadcamics Limited | Barnsley | 2018 |
| Cadden Engineering Scotland Limited | Glasgow | 2014 |
| Caddick & Moss Limited | Bristol | 2006 |
| Caddon Design Ltd. | Clovenfords | 2009 |
| Caddymat Ltd | Broadstone | 2023 |
| Caddyrite Limited | Liss | 2009 |
| Cade More Ltd | London | 2019 |
| Cade Signs & Graphics Limited | Milton Keynes | 2002 |
| Cadeaux Couture Ltd | London | 2025 |
| Cadell Automation Limited | Bexhill-On-Sea | 2025 |
| Cadell Sportswear Limited | Bromsgrove | 2017 |
| Cadema Ltd | London | 2020 |
| Cademuir Engineering Limited | 139 Fountainbridge | 1979 |
| Cademuir Toolmaking Limited | Borders | 2019 |
| Cadence (2026) Number 1 Limited | London | 2013 |
| Cadence (2026) Number 2 Limited | London | 2008 |
| Cadence Coffee Roasters Limited | York | 2023 |
| Cadence Concierge Ltd | Gravesend | 2025 |
| Cadence Dynamics Ltd | Bury St. Edmunds | 2026 |
| Cadence Europress Limited | | 1993 |
| Cadence Performance UK, Limited | Manchester | 2024 |
| Cadent Limited | Bromsgrove | 1991 |
| Cadenzia Ltd | West Molesey | 2020 |
| Cader Ales Limited | Llanbedr | 2012 |
| Cades Limited | Telford | 1996 |
| Cadex Limited | London | 1995 |
| Cadfan Limited | Mitcheldean | 1996 |
| Cadfolio Global Limited | Coventry | 2018 |
| Cadger's Whisky Ltd | Falkirk | 2020 |
| Cadi Doorsets Ltd | Glasgow | 2020 |
| Cadian Ltd | Witney | 2024 |
| Cadisch Precision Meshes Limited | Hatfield | 1990 |
| Cadjewellerldn Ltd | London | 2026 |
| Cadman Capital Investments (Packaging) Limited | Northampton | 2023 |
| Cadman Electrical Systems Ltd | Derbyshire | 2014 |
| Cadman Enterprises Limited | Sheffield | 2022 |
| Cadman Print Limited | Leamington Spa | 2019 |
| Cadmatic Engineering Services Limited | Newbury | 2003 |
| Cadogan Design Ltd | Brentwood | 2026 |
| Cadogan Jones Limited | London | 2019 |
| Cadoosh Ltd | Bristol | 2011 |
| Cadoxton Carpentry Ltd | Barry | 2024 |
| Cadre Components Limited | Warrington | 1994 |
| Cadremont Limited | Cardiff | 2009 |
| Cadrim Limited | Liverpool | 2025 |
| Cadsin Limited | Sevenoaks | 2025 |
| Cadulac Chemicals Limited | Manchester | 2016 |
| Cadwell Construction Ltd | Bedford | 2019 |
| Cady Limited | Cookstown | 2006 |
| Cadzilla Designs Ltd | London | 2021 |
| CAE Automation and Test UK Ltd | London | 2021 |
| CAE Engineering Ltd | Luton | 2019 |
| CAE Solutions Limited | Craigavon | 2025 |
| CAE Systems and Calibration Ltd | Glasgow | 2004 |
| CAE Ventilation Services Northern Limited | Ellesmere Port | 1998 |
| CAE Welding Ltd | Inverness | 2026 |
| Caela London Ltd | Barnet | 2026 |
| Caelais Welsh Foods Limited | Brecon | 2009 |
| Caelestis Regnum Limited | Hove | 2025 |
| Caelira Systems Ltd | Canvey Island | 2025 |
| Caelix Fabrications Limited | London | 2026 |
| Caelo Labs Limited | London | 2025 |
| Caelum Systems Ltd | Royston | 2018 |
| Caenit Trading Co., Limited | London | 2025 |
| Caerbont Automotive Instruments Limited | Swansea | 1993 |
| Caerleon Ready Mixed Concrete Limited | Caerleon | 1988 |
| Caernarfon Engineering Services Ltd | Caernarfon | 2021 |
| Caerphilly Print Services Limited | Cardiff | 2023 |
| Caerphilly Welding Services Ltd | Caerphilly | 2016 |
| Caerwent Craft Chocolate Ltd | Caldicot | 2022 |
| Caesar Fashions Limited | London | 2013 |
| Caesar Group Ltd | Enfield | 2021 |
| Caesarstone (UK) Ltd | Enfield | 2005 |