| City Centre Posters Limited | London | 2007 |
| City Computers Limited | London | 1986 |
| City Confidential Limited | Ilkley | 1993 |
| City Connect Couriers Ltd | Hitchin | 2025 |
| City Corporate Nominees Limited | Manchester | 1996 |
| City Cosmetic Clinic Limited | King'S Lynn | 2012 |
| City Dental Practice Limited | North Wales | 2010 |
| City Docklands Limited | Teddington | 2003 |
| City Electro Limited | Swansea | 1995 |
| City Ergo Ltd | Sidcup | 2016 |
| City Fashion Week Limited | Leeds | 2013 |
| City Financial (Aberdeen) Holdings Limited | Glasgow | 2020 |
| City Financial (Aberdeen) Limited | Glasgow | 1997 |
| City Footsteps Limited | London | 2005 |
| City Four Limited | London | 2007 |
| City Fringe Studios Ltd | London | 2024 |
| City Galleries Limited | London | 2006 |
| City Grey Capital Limited | St. Albans | 2023 |
| City Grey Group Limited | St. Albans | 2023 |
| City Housing Limited | | 2000 |
| City Impact Foundation | London | 2011 |
| City Investments London Limited | Barking | 2015 |
| City K Ltd | London | 2005 |
| City Law Solicitors Cardiff Ltd | Cardiff | 2014 |
| City Leap Bristol Limited | Bristol | 2018 |
| City Leap Limited | Bristol | 2018 |
| City Legal Translations International Ltd | Hampshire | 1998 |
| City Lord Ltd | Wembley Central | 2026 |
| City Meets Tech Ltd | London | 2011 |
| City Mini MIX (Notts) Limited | Derby | 2007 |
| City Mistral Limited | Glasgow | 2009 |
| City Motors Ltd. | Cardiff | 1985 |
| City North Islington Limited | London | 1957 |
| City of Belfast Warehousing Limited | | 1978 |
| City of Derry Accommodation Ltd | Londonderry | 2018 |
| City of Djinns Ltd | London | 2017 |
| City of Inverness Taxis Limited | Inverness Shire | 2000 |
| City of Ironopolis Limited | Saltburn-By-The-Sea | 2006 |
| City of London Brokers Limited | High Wycombe | 1982 |
| City of London Chauffeur Drive Ltd | Old Harlow | 1995 |
| City of London Dairies Limited | London | 2011 |
| City of London Developments Limited | London | 2009 |
| City of London Finance Company Limited(The) | London | 1978 |
| City of London Investments Limited | London | 1982 |
| City of London Latin America Limited | London | 1998 |
| City of London Property Investments Limited | London | 2009 |
| City of London Trustees Limited | London | 2004 |
| City of Portsmouth College Enterprises Ltd | Portsmouth | 1995 |
| City of Westminster College Limited | London | 2017 |
| City Park Technologies Limited | Glasgow | 2005 |
| City Park Technology Centre Limited | Glasgow | 2002 |
| City Plumbing & Heating Services Limited | Coventry | 2010 |
| City Press Limited | Manchester | 2010 |
| City Psychologists Limited | Maldon | 2021 |
| City Pumping Limited | Cheshire | 2013 |
| City Quay Investments Ltd | Lincoln | 2000 |
| City Restoration Trustee Ltd | Enfield | 2026 |
| City Retreat Leicester | Leicester | 2014 |
| City Road Property Management Limited | London | 2015 |
| City Screen (S.O.A.) Limited | Brentford | 1995 |
| City Sightseeing Glasgow Limited | Argyll | 2000 |
| City Skills Academy Limited | Chesterfield | 2020 |
| City Skips (Coventry) Limited | Wolverhampton | 2014 |
| City Slimming Clinic Ltd | Cramlington | 2019 |
| City Solar South West Limited | Truro | 2008 |
| City Streamline Limited | Brighton | 2007 |
| City Structures Building Engineering Limited | Glenrothes | 2024 |
| City Studios United Limited | London | 2007 |
| City Surveillance Limited | Bristol | 2013 |
| City Taxis (Inverness) Limited | Inverness | 2016 |
| City Tools Limited | Dumfries | 2023 |
| City Travel (Newcastle) Limited | Newcastle Upon Tyne | 1983 |
| City Windows & Doors Ltd | Londonderry | 2020 |
| City Workshop Limited | Coventry | 2013 |
| Cityanswer Limited | London | 2000 |
| Citybank Capital Ltd | Exeter | 2018 |
| Citydeal Asset Management Ltd | London | 2014 |
| Citydesign (Manufacturing) Limited | Leicestershire | 1999 |
| Cityflow Logistics Ltd | Ipswich | 2026 |
| Citygate Developments Investment Limited | Norwich | 2008 |
| Citygate Financial Partners Ltd | London | 2025 |
| Cityheart Investments Limited | Leicester | 2022 |
| Cityhurst Limited | London | 2017 |
| Citylifts Installations Limited | Stevenage | 2016 |
| Citylifts Services Limited | Stevenage | 2016 |
| Citymetric Limited | Hull | 2013 |
| Citypress Employee Trustee Limited | Manchester | 2021 |
| Cityrule Limited | London | 1986 |
| Cityscape Builders UK Ltd | London | 2026 |
| Cityscape Homes Limited | Sidmouth | 2000 |
| Cityserver Limited | Crewe | 2019 |
| Cityspace Limited | Ashby-De-La-Zouch | 2009 |
| Citysprint (UK) Group Limited | Redhill | 2010 |
| Citystar Investments Limited | London | 2006 |
| Citytown Group Limited | Maldon | 2001 |
| Citywave Systems Ltd | Solihull | 2026 |
| Citywell Developments Ltd | Salford | 2011 |
| Civica Financial Systems Limited | London | 1980 |
| Civica Investments Limited | Kenilworth | 1958 |
| Civica Trustees Limited | London | 1997 |