| City Trading Company Ltd | Wholesale & retail | 2026 |
| City UK Property Limited | Real estate | 2019 |
| City United Limited | Education | 2003 |
| City Van Services Ltd | Transport & logistics | 2024 |
| City View Midlands Limited | Administrative & support | 2024 |
| City Visions Maintenance Limited | Real estate | 2025 |
| City Watch Security K9 Ltd | Administrative & support | 2025 |
| City Wedding Cars Ltd | Administrative & support | 2012 |
| City Wharf (Lichfield) Management Company Limited | Households | 2006 |
| City Wheel Refurbishment Ltd | Wholesale & retail | 2019 |
| City ZEN SA Limited | Hospitality | 2025 |
| Cityathlete Gym Ltd | Education | 2020 |
| Cityconnectionuk Ltd | Education | 2024 |
| Cityends Limited | Real estate | 2006 |
| Cityfire&Electrical Services Ltd | Construction | 2006 |
| Cityfourinc | Professional & scientific | 1999 |
| Citygate Investments Midlands Ltd | Real estate | 2018 |
| Citygate Property Services Ltd | Real estate | 2022 |
| Citygroup Estates Limited | Real estate | 2020 |
| Citygroup Solutions Limited | Administrative & support | 2020 |
| Citylife Corporation Ltd | Financial services | 2018 |
| Citylife Motor Trade Ltd | Administrative & support | 2018 |
| Citylife Recruitment Ltd | Administrative & support | 2018 |
| Cityline & Partners Ltd | Real estate | 2025 |
| Citymail Ltd | Transport & logistics | 2024 |
| Citymiles Limited | Transport & logistics | 2025 |
| Citymoor Solutions Limited | Administrative & support | 2018 |
| Citypoint 1 Ltd | Real estate | 2000 |
| Cityscape Housing Limited | Real estate | 2024 |
| Cityscapestays Ltd | Real estate | 2024 |
| Citystyle Systems Limited | Information & communication | 1998 |
| Citywide Care Group Limited | Health & social care | 2015 |
| Citywide Housing Ltd | Real estate | 2025 |
| Citywide Locksmiths Ltd | Other services | 2025 |
| Citywide Property and Developments Group Limited | Real estate | 2022 |
| Ciuca Design Ltd | Construction | 2025 |
| Ciuszki U Kikutki Ltd | Wholesale & retail | 2025 |
| Civex Global Ltd | Construction | 2024 |
| Civic Clear Solutions Limited | Transport & logistics | 2023 |
| Civic Housing Ltd | Administrative & support | 2023 |
| Civic Maintenance and Compliance Ltd | Construction | 2026 |
| Civic Property Services Limited | Real estate | 2003 |
| Civic Roots Community CIC | Administrative & support | 2025 |
| Civic Science Media CIC | Information & communication | 2023 |
| Civic Security Ltd | Administrative & support | 2025 |
| Civic Security Services Ltd | Administrative & support | 2025 |
| Civic Square Birmingham CIC | Administrative & support | 2014 |
| Civic Square Constructs C.I.C. | Construction | 2026 |
| Civic Square Neighbourhood Retrofit C.I.C. | Construction | 2025 |
| Civic Stage Ltd | Real estate | 2026 |
| Civil Connect Group Ltd | Construction | 2026 |
| Civil Connect PLC | Construction | 2023 |
| Civil Hawks Ltd | Professional & scientific | 2026 |
| Civil Housing Limited | Real estate | 2024 |
| Civil Tech Source Group Limited | Information & communication | 2020 |
| Civil Tech Source Websearch Limited | Administrative & support | 2020 |
| Civil-I Infrastructure Ltd | Construction | 2025 |
| Civils Connect Ltd | Extraterritorial | 2025 |
| Civils Senior Talent Ltd | Administrative & support | 2010 |
| Civion Limited | Construction | 2026 |
| Civitaiv Ltd | Administrative & support | 2022 |
| Ciworcester Ltd | Hospitality | 2020 |
| Cizmaru Transport Limited | Transport & logistics | 2024 |
| CJ Builders Limited | Construction | 2025 |
| CJ Electrical Consultants Ltd | Professional & scientific | 2019 |
| CJ Engineering Solutions Limited | Professional & scientific | 2018 |
| CJ European Limited | Transport & logistics | 2011 |
| CJ Fletcher Ltd | Construction | 2024 |
| CJ Inkz Ltd | Arts & recreation | 2023 |
| CJ Investment Global Ltd | Financial services | 2026 |
| CJ Jones Installations Limited | Construction | 2005 |
| CJ Motors Service Limited | Wholesale & retail | 2021 |
| CJ Transport Solutions Ltd | Transport & logistics | 2023 |
| CJ Window Cleaning (Bicester) Ltd | Administrative & support | 2025 |
| Cj's Coffee Shop Limited | Hospitality | 2020 |
| CJA (UK) Limited | Construction | 2012 |
| CJB Architects Limited | Professional & scientific | 2022 |
| CJC Computer Solutions Ltd | Extraterritorial | 2022 |
| CJC Furniture Ltd | Wholesale & retail | 2011 |
| CJC Motors Limited | Wholesale & retail | 2026 |
| Cjdc Limited | Financial services | 2003 |
| CJF Plant Hire Limited | Construction | 2014 |
| CJG & Partners Limited | Professional & scientific | 2022 |
| CJH Construction Services Ltd | Construction | 2020 |
| CJH Property Maintenance Ltd | Households | 2021 |
| Cjjq Ltd | Hospitality | 2024 |
| CJM Developments Limited | Administrative & support | 2007 |
| CJM PUB Limited | Hospitality | 2024 |
| CJM Publicity Services Ltd | Information & communication | 2017 |
| CJO Construction Ltd | Construction | 2020 |
| CJR Transport Management, Consultancy and Compliance Limited | Transport & logistics | 2017 |
| CJS Direct Limited | Manufacturing | 2005 |
| CJW Electrical (U.K.) Limited | Construction | 2025 |
| CK Bootcamp Ltd | Education | 2019 |
| CK Classics Limited | Wholesale & retail | 2014 |
| CK Contract Cleaning Ltd | Administrative & support | 2010 |
| CK Coventry Limited | Hospitality | 2024 |
| CK Legal & Consultancy Services Limited | Professional & scientific | 2014 |
| CK Nottingham Limited | Hospitality | 2026 |
| CK Textile Limited | Wholesale & retail | 2022 |