| City Lighting Services Limited | Chelmsford | 2012 |
| City Line Elevators Ltd | Longfield | 2018 |
| City Lockers Limited | Basildon | 2013 |
| City Locks Co Highland Ltd | Inverness | 2023 |
| City Locksmiths Gwent Limited | Newport | 2012 |
| City Machinery Limited | Birmingham | 2021 |
| City Marble Ltd | Greenford | 2019 |
| City Market Ltd | London | 2022 |
| City Media Group Ltd | Newcastle Upon Tyne | 2023 |
| City Memorials Ltd | Bushmills | 2026 |
| City Metals UK Limited | Cheshire | 2003 |
| City Motor Services Ltd | Alfreton | 2017 |
| City Neon Sign Company Limited | Tyseley | 2000 |
| City News Network T/A/ Channel UK 44 Limited | Cardiff | 2018 |
| City Occupational Limited | London | 2009 |
| City of Aberdeen Distillery Ltd | Westhill | 2016 |
| City of Newport Model Engineering Society (NOT for Profit) Limited | Caldicot | 1995 |
| City of Rome Ltd | Canvey Island | 2021 |
| City Office (NI) Ltd | | 1982 |
| City Oils Group Limited | Old Harlow | 2015 |
| City Ornate Mouldings Ltd | Hove | 2023 |
| City Pages Ltd | Birmingham | 2013 |
| City Plastics Limited | West Bromwich | 2006 |
| City Powder Coatings Limited | Bradford | 2018 |
| City Press Knives Ltd | Leicestershire | 2005 |
| City Press Leeds Limited | Leeds | 1986 |
| City Price Limited | Solihull | 2020 |
| City Print & Design Ltd | London | 2010 |
| City Print Hull Ltd | Hull | 2024 |
| City Print Limited | Bradford | 2021 |
| City Recycling and Storage Ltd | Leicester | 2023 |
| City Restoration (Joinery) Ltd | Enfield | 2012 |
| City Rewinds & Drives Ltd | Leicester | 2000 |
| City SAW & Knife Services Limited | Norwich | 2003 |
| City Screen Print Limited | Rochester | 2002 |
| City Screen Printers (U.K.) Limited | Leicester | 1987 |
| City Sheds & Workshops Limited | Liverpool | 2024 |
| City Sideways Ltd | London | 2025 |
| City Signs & Design Ltd | Swindon | 2014 |
| City Signs (Midlands) Limited | Staffordshire | 1984 |
| City Signs (Stoke-On-Trent) Ltd. | Staffordshire | 1991 |
| City Signs and Display Limited | Newcastle Upon Tyne | 1987 |
| City Signs Limited | Norwich | 2004 |
| City Signs Print and Design Limited | Mansfield | 2003 |
| City Signs Signage and Display Ltd | Worcester | 2015 |
| City Sitemix Concrete Limited | Warrington | 2004 |
| City Sourcing Ltd | Luton | 2007 |
| City Special Metals Ltd | Maldon | 2001 |
| City Steel Ltd | London | 2026 |
| City Steel Structures Limited | Barton Mills | 2006 |
| City Styles (Leicester) Limited | Leicester | 1990 |
| City Sweet Centre Limited | London | 1985 |
| City Technical Services (UK) Limited | Glasgow | 2005 |
| City Technology Limited | Bracknell | 1977 |
| City Towbars Ltd | Glasgow | 2018 |
| City Trade Signs Ltd | Manchester | 2023 |
| City Windmills Ltd | Cardiff | 2010 |
| City Windows and Glass Ltd | Thornton Heath | 2007 |
| City Windows Ltd | Leicester | 2024 |
| City Wood Services Ltd | London | 2010 |
| City&Rural Electrics Limited | Iver | 2025 |
| City.S.P.D Ltd | Newark | 2023 |
| Citybordersspiritco. Ltd | Bristol | 2022 |
| Citydor Solutions Limited | Sittingbourne | 2017 |
| Cityev Ltd. | Portsmouth | 2011 |
| Cityfi Technology Ltd | London | 2024 |
| Citygate Computers Limited | Chelmsford | 1998 |
| Cityguard Gates Limited | Esher | 2026 |
| Cityloft Real Estate Ltd. | London | 2014 |
| CITYM3D Limited | Slough | 2018 |
| Cityplan Building Facilities Ltd | Leigh-On-Sea | 2001 |
| Citypoint Trading Limited | Nottingham | 2023 |
| Cityprint (Derry) Ltd | Derry | 2019 |
| Cityrailinks Ltd | Bristol | 2020 |
| Cityshuttle Ltd | London | 2018 |
| Cityspark Ltd | Dagenham | 2022 |
| Citysquared Limited | Norwich | 2004 |
| Citywise Innovations Ltd | London | 2025 |
| Citywood Group Ltd | London | 2021 |
| Ciufoli Ltd | Salisbury | 2024 |
| Ciurillo Ltd | London | 2023 |
| Civic & Ceremonial Limited | Bramhall | 2020 |
| Civic Square Ltd | Borehamwood | 2008 |
| Civil and Marine Limited | Maidenhead | 1988 |
| Civils Material Testing Limited | Omagh | 2018 |
| Civils Rail Partnership Ltd | Ashton-Under-Lyne | 2019 |
| Civitates Limited | Bath | 2006 |
| Cixi Golden Star Bearing Co., Ltd | Beckenham | 2013 |
| Cizlikm Ltd | Cambridge | 2023 |
| Cizzle Biotech Ltd | London | 2001 |
| Ciëla Collective Ltd | London | 2026 |
| CJ & DJ Barton Limited | Colchester | 2005 |
| CJ Access Ltd | Liverpool | 2026 |
| CJ Aluminium Limited | Leeds | 2012 |
| CJ Aviation Services Ltd | Bury St. Edmunds | 2023 |
| CJ Ayton Ltd | Consett | 2022 |
| CJ Carrel Limited | Coventry | 2007 |
| CJ Electrical (SOT) Limited | Stoke-On-Trent | 2006 |
| CJ Electrical Installations Limited | Wiltshire | 2007 |
| CJ Fabrication and Welding Services Ltd | Telford | 2024 |