| Cabintec Ltd | Dungannon | 2021 |
| Cabison Ltd | London | 2024 |
| Cabitec Limited | Bradford | 2024 |
| Cable & Blake Limited | Kendal | 2018 |
| Cable & Marine Ltd | Ramsgate | 2021 |
| Cable & Wire Technical Services Ltd | Herne Bay | 1992 |
| Cable and Taping (UK) Ltd | Spennymoor | 2021 |
| Cable and Wire Machinery Services Ltd | Chorley | 2025 |
| Cable Assembly Innovations Ltd | Macclesfield | 2024 |
| Cable Coatings Limited | Batley | 2016 |
| Cable Coffee Tech Ltd | Margate | 2021 |
| Cable Control Limited | Chorley | 2013 |
| Cable CUT Detector Limited | Towcester | 2026 |
| Cable Detection Limited | Stoke-On-Trent | 2000 |
| Cable Doctors Ltd | Derby | 2026 |
| Cable Fence Systems Ltd | Keighley | 2013 |
| Cable First Limited | Dorset | 1996 |
| Cable Grips (Minehead) Limited | Minehead | 1990 |
| Cable Harness Wiring Solutions UK Ltd | Teversal | 2026 |
| Cable Harness Works Ltd | Birmingham | 2026 |
| Cable Harnesses (UK) Limited | Trostre Llanelli | 1990 |
| Cable Installation Consultants Ltd | Middlesbrough | 2023 |
| Cable Jointing Solutions Limited | Birmingham | 2015 |
| Cable Management Supplies Limited | Cirencester | 1984 |
| Cable Monkey Ltd | Cwmbran | 2024 |
| Cable One Limited | London | 2021 |
| Cable Pressure Systems Limited | Stirling | 1994 |
| Cable Realisations Limited | Woking | 1996 |
| Cable Recycling DOT COM Limited | Canterbury | 2015 |
| Cable Safe Limited | Doncaster | 2000 |
| Cable Sound Studios Limited | London | 2017 |
| Cable Tapes (UK) Ltd | Manchester | 2008 |
| Cable Technology Network Ltd | Ammanford | 2020 |
| Cable Terminology Ltd | High Wycombe | 2006 |
| Cable Trail Limited | Stockton-On-Tees | 2015 |
| Cablearc Assemblies Limited | Ashbourne | 2021 |
| Cableboss Limited | Bristol | 2022 |
| Cablebright Limited | Northumberland | 1999 |
| Cablecaddy Limited | Telford | 2002 |
| Cablecraft Motion Controls Limited | Hailsham | 2010 |
| Cableduct Limited | London | 1940 |
| Cableflow International Limited | London | 1989 |
| Cableforge Ltd | Thurston | 2026 |
| Cablehunt Ltd | London | 2024 |
| Cablejog Limited | Warrington | 2003 |
| Cablejudge (North East) | London | 1957 |
| Cablelab Limited | London | 2020 |
| Cablelynx Limited | Newport Pagnell | 2002 |
| Cablemole Limited | Tyn-Y-Gongl | 2025 |
| Cableplus (Europe) Limited | Swindon | 2002 |
| Cablepoint Limited | Kingston Upon Hull | 1987 |
| Cables Electrical Ltd | Ilminster | 2020 |
| Cablescan Limited | Whitstable | 2001 |
| Cabletime Limited | London | 2001 |
| Cabletronics Limited | Boston | 2001 |
| Cableworld Limited | Bolton | 2000 |
| Cablex International UK Limited | Taunton | 2018 |
| Cablex UK Trade Ltd | Bungay | 1970 |
| Cablexx UK Ltd | London | 2025 |
| Cabo Concepts Limited | Bury | 2016 |
| Caboodle IT Ltd | Preston | 2025 |
| Cabosse Limited | Alnwick | 2007 |
| Cabot Carbon Limited | Penarth | 1948 |
| Cabot Company Limited | Edgware | 1972 |
| Cabourn Engineering Limited | Barnetby | 2016 |
| Cabourns Carpentry Ltd | Alfreton | 2020 |
| Cabra Films Ltd | London | 2024 |
| Cabragh Engineering Limited | Dungannon | 2002 |
| Cabragh Mushroom Composts Limited | Craigavon | 2001 |
| Cabrito Goat Meat Limited | Newcastle Upon Tyne | 2016 |
| Cabss Innovations Limited | Lincoln | 2024 |
| Cabtek Limited | Nuneaton | 1993 |
| Cabung Limited | Beverley | 2016 |
| Caburn Engineering Limited | West Sussex | 1997 |
| CAC (North East) Limited | Chester Le Street | 2015 |
| Cacadp Limited | Stockport | 1999 |
| Cacao Brew Ltd | Newcastle Upon Tyne | 2018 |
| Cacao Circle Limited | Birkenhead | 2022 |
| Cacao Co Ltd | Brighton & Hove | 2026 |
| Cacao Foods Limited | London | 2025 |
| Cacao London Living Ltd | London | 2022 |
| Cache Computers Limited | London | 2025 |
| Cachen UK Co., Ltd | London | 2017 |
| Caco&Vavo Industrial Ltd | London | 2023 |
| Cacoon Ltd | Newcastle Upon Tyne | 2026 |
| Cacti Limited | London | 2026 |
| Cacti PCS Ltd | Flint | 2023 |
| Cactus Carpentry Ltd | Bridgend | 2025 |
| Cactus Data Ltd | Bristol | 2010 |
| Cactus Dental Technology Ltd | Dingwall | 2017 |
| Cactus Graphics Ltd | Whitfield, Dover | 2011 |
| Cactus Health Ltd | Birmingham | 2023 |
| Cactus Production Events Ltd | Colchester | 2024 |
| Cactus Products Limited | Hartlepool | 2009 |
| Cactus Tongue Ltd | Helston | 2012 |
| Cactuswave Limited | London | 2024 |
| CAD & Bounder Services Limited | Stafford | 1998 |
| CAD 33 Ltd | Birmingham | 2024 |
| CAD 4 Jewellers Ltd | Wimborne | 2020 |
| CAD CAM Automotive Limited | Hockley Heath | 2013 |