| Cullen Pulp Products Limited | Glasgow | 2009 |
| Cullen Travel Limited | Hatfield | 2017 |
| Culleton Digital Limited | Liverpool | 2023 |
| Cullross Properties Limited | Angmering | 1988 |
| Culmstock Limited | Manchester | 1975 |
| Culpin Solutions Limited | Spalding | 2009 |
| Culross Bolton Ltd | Preston | 2006 |
| Cult of Customs Ltd | Fleet | 2025 |
| Cultural Capital Investments Limited | London | 2023 |
| Culture Crossings Limited | Nottingham | 2017 |
| Culture Studio Ltd | Windsor | 2019 |
| Culture Vultures Limited | Salford | 2026 |
| Cultureshift EBT Limited | Manchester | 2021 |
| Culverland Ltd | Bodmin | 2024 |
| Culverwell Limited | Edinburgh | 2004 |
| Culzean Ltd | Prestwick | 2016 |
| Cumberland 1958 Limited | Stockton-On-Tees | 2015 |
| Cumberland and Westmorland Schools Limited | Carnforth | 2006 |
| Cumberland Close 1976 Limited | Sheffield | 2014 |
| Cumberland Court(Westminster)Tenants Association Limited | Maidstone | 1959 |
| Cumberland Healthcare Limited | Nottingham | 2003 |
| Cumbernauld Funeral Services Ltd. | Glasgow | 2002 |
| Cumbria & North West Livestock Group Limited | Milnthorpe | 2007 |
| Cumbria Construction Equipment Limited | Wigton | 2019 |
| Cumbria Family Mediation Limited | Carlisle | 2013 |
| Cumbria Garden Buildings Limited | Penrith | 2022 |
| Cumbria Hose Services Limited | Carlisle | 2013 |
| Cumbria Natural Stone Limited | Carlisle, | 2015 |
| Cumbria Refrigeration Limited | Carlisle | 2007 |
| Cumbria Special Events Company Limited | Cockermouth | 2012 |
| Cumbria Storage Systems Limited | Huddersfield | 1991 |
| Cumbria Teaching & Care Limited | Ulverston | 2015 |
| Cumbria Training Ltd | Abbeytown | 2015 |
| Cumbria Training Services Limited | Abbeytown | 2010 |
| Cumbria.Digital Ltd | Penrith | 2022 |
| Cumbrian Heavy Horses Ltd | Millom | 2025 |
| Cumfilux Beds Limited | Rochester | 1993 |
| Cummins Bearing Limited | Beckenham | 2020 |
| Cummins Turbo Technologies Limited | West Yorkshire | 1952 |
| Cummins U.K. Holdings Ltd. | London | 1973 |
| Cummins Ventures Limited | Harrogate | 2026 |
| Cumstead Limited | Salford | 2000 |
| Cumulus Accountancy Limited | Chatteris | 2021 |
| Cumulus Accounting Limited | Chatteris | 2021 |
| Cumulus Group Limited | Billingshurst | 2014 |
| Cumulus Marketing Limited | Billingshurst | 2014 |
| Cumulus Numbers Ltd | Mansfield | 1999 |
| Cumulus Payroll Services Ltd | Chatteris | 2017 |
| Cumulus Services Number One Limited | Billingshurst | 2014 |
| Cunack Ltd | Eastleigh | 2024 |
| Cunard Development Limited | Salford | 2011 |
| Cuneyt Yachting Limited | Blackpool | 2024 |
| Cuniculus Surveying Limited | King'S Lynn | 2009 |
| Cunliffe Buck Holdings Limited | Leeds | 2013 |
| Cunningham Close 1960 Limited | Southend-On-Sea | 2014 |
| Cunningham Marine Ltd | East Cowes | 2022 |
| Cunningham Property Developers Ltd | Birmingham | 2026 |
| Cunningstunt Limited | Bradford-On-Avon | 2002 |
| CUP of Tea Publishing Limited | Stroud | 2023 |
| Cupa Slate Ltd | Colindale | 2021 |
| Cupaz Ltd | Ware | 2007 |
| Cupcards Limited | Chessington | 2018 |
| Cupo Limited | Pencoed, Bridgend | 2010 |
| Cuppingmethods Limited | London | 2023 |
| Cura Services (Scotland) Limited | Musselburgh | 2018 |
| Curaradi Limited | Stanley | 2025 |
| Curate and Co. London Ltd | Woodford Green | 2026 |
| Curated & Organised Limited | London | 2021 |
| Curator Wealth Management Limited | Peterborough | 2025 |
| Curb Architecture Limited | Market Harborough | 2017 |
| Curbishley Developments Limited | Wilmslow | 1998 |
| Curbside Convenience Ltd | London | 2025 |
| Curbside Limited | Shoreham-By-Sea | 2023 |
| Curcon Ltd | London | 2019 |
| Cure by Lola Ltd | Oldham | 2025 |
| Cure Connect Ltd | Coventry | 2023 |
| Cure Natural Ltd | Manchester | 2022 |
| CURE4SOUL Ltd | St. Neots | 2021 |
| Curehouse Ltd | London | 2022 |
| Curfew Incubators Ltd | Lancaster | 2017 |
| Curida Ltd | London | 2025 |
| Curious Characters Ltd | London | 2016 |
| Curious EGG Film & TV Limited | Hereford | 2004 |
| Curle Consultancy Limited | Lanark | 2018 |
| Curle Stewart Nominees Limited | Glasgow | 2023 |
| Curlee Ltd | Bury St. Edmunds | 2024 |
| Curlew Communities Limited | Newcastle Upon Tyne | 2016 |
| Curley Brothers Property Limited | Weston-Super-Mare | 2016 |
| Curling 1961 Limited | Newbury | 2016 |
| Curly K9 Grooming Limited | Windsor | 2016 |
| Curragh Hill Management Limited | Ballymena | 2007 |
| Currahee Projects Limited | London | 2015 |
| Currall Lewis & Martin Limited | Watford | 1925 |
| Currency Dealers Limited | London | 2009 |
| Currency Ltd | London | 2002 |
| Current Electrical Contractors Ltd | Pontypridd | 2023 |
| Current Solutions Ltd | Diss | 2015 |
| Current Technology Ltd | Cheshire | 1991 |
| Currently Nameless Limited | Harrogate | 2022 |
| Currian 1969 Limited | St. Austell | 2014 |