| CVR Supplies.Ltd | Southam | 2007 |
| CVS Diesel Ltd | Rochester | 2014 |
| CVS Financial Limited | Birmingham | 2012 |
| CVS Pentapower Ltd | Rochester | 2014 |
| CVT Logistics Limited | Manchester | 2011 |
| CW Developments (Yorkshire) Ltd | Keighley | 2016 |
| CW Fencing Ltd | Wix Manningtree | 1999 |
| CW Integra Ltd | London | 2023 |
| CW Trustees Limited | London | 2013 |
| CW123 Limited | Cardiff | 2005 |
| CWA Finance Limited | Frome | 2024 |
| CWB Holdings Limited | Maidstone | 2024 |
| CWB Legacy Management Ltd | Coventry | 2022 |
| CWD Franchise Ltd | Huddersfield | 2014 |
| CWF (2013) Limited | Wilmslow | 2013 |
| Cwhp 2 Limited | Orpington | 2024 |
| Cwhp 3 Limited | Orpington | 2024 |
| CWI Limited | Ilminster | 2016 |
| CWM Haven Ltd. | Porth | 2025 |
| Cwmeot Limited | Glasgow | 2023 |
| Cwmh Branding Ltd | Plymouth | 2024 |
| Cwmni Ynni CYF | Ruthin | 2019 |
| Cwmorthin Slate Quarry 1994 Company Limited | Derby | 1994 |
| Cwmtillery Glass Centre (Holdings) Limited | Newport | 2012 |
| CWR Management RTM Company Limited | Greenford | 2014 |
| Cwrt Penrhwityn 2 Management Company Limited | Bourne End | 2006 |
| CWS Hub Limited | Epsom | 2024 |
| CWT Clothing Limited | Leicester | 2022 |
| CWT Dormant Ltd | St. Helens | 2019 |
| CWT Sitos (UK) Ltd | East Tilbury | 2002 |
| Cwt-Y-Bugail Slate Quarries,Limited(The) | Derby | 1923 |
| Cwtch Limited | Bridgend | 2014 |
| CX Works Limited | London | 2020 |
| CX2A Ltd | North Bovey | 2022 |
| CX500 Holding Limited | London | 2020 |
| CXK Careers Limited | Ashford | 2011 |
| CXK Trading Limited | Ashford | 2011 |
| CXO Consulting Limited | Romford | 2015 |
| CXO Couriers Ltd | Romford | 2018 |
| CXT Industrial Co., Ltd | Beckenham | 2014 |
| CXZ Limited | London | 2018 |
| CY & Co International Ltd | London | 2015 |
| CY Consulting Sweden Limited | London | 2023 |
| CY Eyewear Ltd. | London | 2024 |
| CY Project Ltd | Birmingham | 2023 |
| Cy-Group Ltd | South Croydon | 2017 |
| CY4OR Digital Limited | Manchester | 2013 |
| CY4OR Limited | Manchester | 2014 |
| CY4OR Secure Limited | Manchester | 2013 |
| Cyan East International Trading Co., Ltd | Cardiff | 2019 |
| Cyan River Limited | Wellingborough | 2009 |
| Cybacomms Ltd | London | 2004 |
| Cybarx Consulting Ltd | London | 2016 |
| Cybele (Holdings) Limited | Salisbury | 2006 |
| Cyber Assure Limited | London | 2025 |
| Cyber Circuit Technology Co., Ltd | Kington | 2015 |
| Cyber City Taxi Ltd | Northwood | 2026 |
| Cyber Cyan Ltd | London | 2020 |
| Cyber Excellis Consulting Ltd | Leeds | 2024 |
| Cyber Group Limited | Harrogate | 2025 |
| Cyber Realm Ltd | London | 2024 |
| Cyber Station Security Ltd | London | 2020 |
| Cyber X Ltd | Plymouth | 2015 |
| Cyberden Solutions Limited | Cheadle | 2010 |
| Cyberexpobelfast Limited | Belfast | 2025 |
| Cyberfin Limited | London | 2025 |
| Cyberfirm Limited | Taunton | 2004 |
| Cyberfirst Limited | Stockton-On-Tees | 2000 |
| Cyberforge Dynamics Ltd | Edinburgh | 2025 |
| Cybergrep Limited | West Molesey | 2018 |
| Cyberharbor Innovations Ltd | Edinburgh | 2025 |
| Cyberhawk Ltd | St. Andrews | 2025 |
| Cyberjunk Ltd | London | 2022 |
| Cyberlab AI Limited | Alderley Edge | 2025 |
| Cyberlab Group Limited | Alderley Edge | 2025 |
| Cyberlab One Limited | Macclesfield | 2025 |
| Cybermatrix Limited | St. Ives | 2024 |
| Cybermaxx Technology Ltd | Manchester | 2013 |
| Cyberon Systems Limited | Southport | 2001 |
| Cyberpac Limited | Bury St. Edmunds | 2016 |
| Cyberpark Group Ltd | Belfast | 2017 |
| Cyberqube EOT Limited | Newcastle Upon Tyne | 2022 |
| Cybersec Automotive Ltd | Tarporley | 2023 |
| Cybershe Global Network Ltd | London | 2025 |
| Cybershift Limited | Rotherham | 1998 |
| Cybersphere Networks Ltd | London | 2025 |
| Cybertack Limited | Cheadle | 2025 |
| Cybertector Ltd | Wallington | 2025 |
| Cybervanguard Dynamics Ltd | Edinburgh | 2025 |
| Cybex Limited | Leicestershire | 1997 |
| Cybi Plastics Limited | Gaerwen | 2003 |
| Cybonon Co., Ltd. | London | 2016 |
| Cycle Aero Logistics Limited | Manchester | 2025 |
| Cycle Exchange Marketing Limited | Liverpool | 2022 |
| Cycle Legal Limited | London | 2015 |
| Cycle Medic Norwich Ltd | Norwich | 2024 |
| Cycle Surgeon Ltd | Bolton | 2015 |
| Cycle Worldwide Ltd | Alresford | 2020 |
| Cyclestore Limited | Congleton | 2004 |
| Cycling for Softies Limited | Richmond | 2015 |