| CNC Maintenance Solutions Ltd | Halesowen | 2019 |
| CNC Mastery Ltd | Bromley | 2019 |
| CNC Medic Ltd | Sheffield | 2023 |
| CNC Metal Designs Ltd | Uckfield | 2020 |
| CNC OIL Skimmers Limited | Cleckheaton | 2015 |
| CNC Parts and Services Limited | Droitwich | 2025 |
| CNC Precision Engineering Ltd | Leicester | 2023 |
| CNC Precision Engineering Services Ltd | Norwich | 2006 |
| CNC Precision Manufacturing Ltd | Waterbeach | 2018 |
| CNC Products Limited | Huddersfield | 2011 |
| CNC Proz Ltd | Nottingham | 2025 |
| CNC Robotics Limited | Liverpool | 2010 |
| CNC Router Cutting Services Ltd | Sutton In Ashfield | 2020 |
| CNC Routing Limited | Weybridge | 2005 |
| CNC Routing Solutions Ltd | Lutterworth | 2012 |
| CNC Services NE Ltd | Leeds | 2021 |
| CNC Solutions Ltd | London | 2022 |
| CNC Spares and Repairs Limited | Huddersfield | 2019 |
| CNC Store Ltd | London | 2020 |
| CNC Support Limited | Colne | 1997 |
| CNC Systems Limited | Plymouth | 2000 |
| CNC Tech Engineering Ltd | Wednesbury | 2014 |
| CNC Technical Services Limited | Nottingham | 2016 |
| CNC Techniques Limited | Buckingham | 2014 |
| CNC Timber Projects Limited | Irvine | 2015 |
| CNC Turned Products Ltd | Northants | 2018 |
| CNC Worx Ltd | London | 2017 |
| Cnc-It Limited | Richmond | 2000 |
| Cnc-Right Services Limited | Hinckley | 2014 |
| CNC4UUK Ltd | Leeds | 2024 |
| Cncenery Limited | Barnsley | 2024 |
| Cnclogy Ltd | Atherstone | 2023 |
| Cncmasters Ltd | London | 2024 |
| Cncraft Ltd | March | 2024 |
| Cnctehnics Ltd | Cambridge | 2023 |
| CND Electronic Technology Company Limited | West Midlands, England, | 2023 |
| CND Resource Limited | Beckenham | 2024 |
| Cndle Studio Ltd | Peterborough | 2019 |
| CNE International Limited | Norwich | 2007 |
| CNE Solutions Ltd | Wickford | 2024 |
| Cner Advanced Technology Limited | London | 2017 |
| CNF Precision Engineering Limited | Aylesbury | 1977 |
| CNG Metal Co. Ltd | Mildenhall, | 2025 |
| CNH Print Ltd | Northampton | 2018 |
| CNH U.K. Limited | Essex | 1986 |
| CNH2016 Limited | Cheltenham | 2007 |
| Cniguard Ltd | Borehamwood | 2005 |
| Cnj-Group Limited | Motherwell | 2020 |
| CNL Carpentry Ltd | Coventry | 2022 |
| Cnmt Ltd | Rugby | 2019 |
| CNR CNC Ltd | Exeter | 2023 |
| CNR Electric Ltd | London | 2020 |
| Cnrg Technologies Limited | London | 2014 |
| CNS Developments Ltd | St. Asaph | 2018 |
| Cnsncl Ltd | London | 2025 |
| Cntl Limited | Nottingham | 2001 |
| Cnvr Limited | Plymouth | 2002 |
| CNW Architectural Limited | London | 2010 |
| Co - Vertec Limited | Waterlooville | 1992 |
| Co Built Fabrication Limited | Shipston-On-Stour | 2011 |
| Co Print Labs Limited | Maidenhead | 2022 |
| Co Sustain LAB Limited | Nottingham | 2025 |
| Co Tops Limited | Bedfordshire | 1995 |
| Co&Co Ltd | London | 2013 |
| Co&Se Ltd | Coventry | 2013 |
| Co'Couture Limited | Bangor | 2008 |
| Co'Hort Manufacturing Limited | Northants | 1994 |
| Co-At Marine Limited | Paisley | 2005 |
| Co-B-Tech UK Limited | Darlington | 1991 |
| Co-Creative Jewellers Ltd | Birmingham | 2022 |
| Co-Hydro Limited | Cowbridge | 2013 |
| Co-Hydrover Developments Ltd | Cardiff | 2015 |
| Co-Ordinated Design and Management Limited | Rochester | 2008 |
| Co-Ordinated Packaging Limited | Essex | 1978 |
| Co-Pod Limited | Shropshire | 2006 |
| CO2 Extraction Limited | Lancaster | 2018 |
| CO2 Laser Repairs Limited | Manchester | 2020 |
| CO2 Recovery Ltd | Peterhead | 2022 |
| CO2 YOU Limited | London | 2020 |
| Coach AID Ltd | Manchester | 2004 |
| Coach and Commercial Ltd | Pontefract | 2018 |
| Coach Door Systems Ltd | Tamworth | 2018 |
| Coach House Coffee Ltd | Northwich | 2026 |
| Coach House Forge Ltd | Nantwich | 2018 |
| Coach House Joinery Partnership Limited | Whitstable | 2017 |
| Coachbuilt GB Ltd | Nuneaton | 2009 |
| Coachbuilt Spirits Ltd | London | 2021 |
| Coacher Sports Limited | Clitheroe | 2011 |
| Coachhouse Cabinets Limited | Littlehampton | 1999 |
| Coachman Caravan Company Limited | Hull | 1986 |
| Coachspar Limited | Mansfield | 2017 |
| Coacora International Limited | Peterborough | 2018 |
| Coactum Ltd | London | 2019 |
| Coaja Construct Ltd | Harrow | 2022 |
| Coakley & COX Ltd | | 2003 |
| Coal Bicycles Ltd | Mansfield | 2020 |
| Coal Tiger Innovations Ltd | London | 2025 |
| Coalition Brewing Company Ltd | Purley | 2015 |
| Coalition Engineering Ltd | Luton | 2023 |
| Coalition OFF Grid Limited | Sheffield | 2025 |