| City Training Group Ltd | Manchester | 2017 |
| City Transport Ltd | Bradford | 2017 |
| City Tree Ltd | Wimbledon | 2019 |
| City Turkish Barber Derry Ltd | Londonderry | 2025 |
| City Turkish Barber Ltd | London | 2021 |
| City Tutors Limited | London | 2017 |
| City Tyres (Preston) Ltd | Preston | 2021 |
| City U Club Limited | London | 2026 |
| City Unisex Ltd | Hayes | 2014 |
| City Valeting Centres Ltd | London | 2018 |
| City Valley Church | Shipley | 2013 |
| City Vehicle Management Limited | Andover | 2011 |
| City WAX Studio Ltd | London | 2023 |
| City Winners Limited | Crawley | 2007 |
| City Working Holdings Ltd | London | 2013 |
| City XXS Limited | Clacton-On-Sea | 2022 |
| City's Barbers Limited | Newcastle Upon Tyne | 2017 |
| City-Concierge Limited | Pinner | 2002 |
| CITY2COUNTRY Services Ltd | Uxbridge | 2019 |
| Citybutler Concierge Limited | London | 2007 |
| Citycis Ltd | Harrow | 2021 |
| Citydating.Com Ltd | London | 2002 |
| Cityfringe Business Technology Consultants Ltd | London | 2010 |
| Citygate Christian Outreach Centre | Kent | 2005 |
| Citygate Church | Bournemouth | 2006 |
| Cityhouse Consulting Ltd | London | 2016 |
| Citylaundryapp Ltd | London | 2019 |
| Cityleds Limited | Chester | 2024 |
| Cityparents Limited | Tenterden | 2022 |
| Cityscape Residences Ltd | Glasgow | 2023 |
| Cityscape Urban Renewal Limited | Sidmouth | 2014 |
| Cityshire Limited | London | 1994 |
| Citysmith Limited | Warrington | 2018 |
| Cityspec Specialist Pest Management Solutions Limited | Shrewsbury | 2006 |
| Citystasher Limited | London | 2015 |
| Citysurfacerepairs Ltd | London | 2021 |
| Cityswoon Ltd | Ruislip, | 2022 |
| Citywash Ltd | Leicester | 2020 |
| Citywaxman Ltd. | Liverpool | 2025 |
| Citywest Incorporated Limited | Newmarket | 2003 |
| Citywide Care Agency Ltd | Hounslow | 2017 |
| Citywide Enterprises Ltd | London | 2025 |
| Citywide Housing Group Ltd | Bradford | 2021 |
| Citywide Locksmiths Ltd | Birmingham | 2025 |
| Citywide Services Ltd | Cardiff | 2017 |
| Citywide UK Services Limited | Ilford | 2019 |
| Cityworth Limited | Beverley | 1979 |
| Civak Limited | London | 2020 |
| Civcons Hive Ltd | London | 2021 |
| Civette Limited | London | 2015 |
| Civic Brixton Limited | London | 2019 |
| Civic Hall Limited | Bradford | 2025 |
| Civic Innovation CIC | Lytham St. Annes | 2024 |
| Civic Power Fund | London | 2021 |
| Civic Voice | London | 2010 |
| Civiccart Ltd | London | 2025 |
| Civiclit Mckenzie Support Service Ltd | London | 2025 |
| Civicore CIC | Bolton | 2025 |
| Civil Ceremonies Limited | Kettering | 2002 |
| Civil Costs Consultants Limited | Bushey | 2023 |
| Civil Court Users Association | Leigh | 1990 |
| Civil Enforcement Agents Limited | Leeds | 2016 |
| Civil Enforcement Association Limited | Stoke-On-Trent | 2011 |
| Civil Engineering Contractors Association | London | 1996 |
| Civil Engineering Contractors Association (North East) Limited | Gateshead | 1996 |
| Civil Engineering Contractors Association (Scotland) | Stirling | 1997 |
| Civil Engineering Contractors Association (Southern) Ltd | Chichester | 1996 |
| Civil Engineering Contractors Association (Wales) Limited | Cardiff | 1997 |
| Civil Engineering Contractors Association, North West Limited | Warrington | 2006 |
| Civil Exchange | London | 2011 |
| Civil Mediation Council Limited | London | 2014 |
| Civil Nuclear Constabulary Welfare Limited | Abingdon | 2010 |
| Civil Safety Tankering Ltd | Ilkley | 2018 |
| Civil Service Motoring Association,Limited(The) | Brighton | 1930 |
| Civil Society for Labour | London | 2024 |
| Civil Society Forum Limited | Southampton | 2011 |
| Civil Society Legislative Advocacy Centre | London | 2018 |
| Civil Support Services Ltd | Preston | 2008 |
| Civils (Shetland) Ltd | Inverness | 2015 |
| Civils Design and Construct Limited | Worsley | 2018 |
| Civision UK Ltd | Eastbourne | 2020 |
| Ciwan (Ipswich) Ltd | Ipswich | 2025 |
| Ciwem Professional Services Limited | London | 1992 |
| Ciwm Enterprises Ltd | Northampton | 1992 |
| Ciyani Limited | Preston | 2018 |
| Ciyos Professional Aesthetics Ltd | Wirral | 2026 |
| CJ Aesthetics Bristol Ltd | Bristol | 2023 |
| CJ Aesthetics Ltd | Chester | 2016 |
| CJ Barber Ltd | St. Helens | 2025 |
| CJ Barbershop Ltd | Leeds | 2016 |
| CJ Beauty and Consultant Ltd | Petersfield | 2026 |
| CJ Beauty Kent Ltd | Margate | 2023 |
| CJ Carpet Fitting Services Limited | Falkirk | 2025 |
| CJ Collective Ltd | Norwich | 2020 |
| CJ Compliance Services Ltd | Lichfield | 2019 |
| CJ Engineering Services U.K Ltd | Meopham | 2026 |
| CJ Garden Equipment Repairs Ltd | Maidstone | 2021 |
| CJ Goodfellow Limited | Nottingham | 2024 |
| CJ Health & Fitness Consultancy Limited | Thornton Cleveleys | 2017 |
| CJ International Beauty Limited | Penarth | 2004 |