| Citadel Financial Services Ltd | Financial services | 2024 |
| Citadel Medicals Limited | Health & social care | 2023 |
| Citadel Miniatures Limited | Manufacturing | 1978 |
| Citielectrical Limited | Extraterritorial | 2011 |
| Citigas Emergency GAS Services Limited | Construction | 2004 |
| Citigen (London) Limited | Energy | 1989 |
| Citilight Property Group Ltd | Real estate | 2025 |
| Citiresidential Limited | Real estate | 2023 |
| Citisolar Limited | Extraterritorial | 2011 |
| Citizen Corporate Finance Limited | Administrative & support | 2008 |
| Citrin Holdings Ltd | Other services | 2025 |
| Citrosoft Drinks (Midlands) Limited | Wholesale & retail | 1983 |
| Citrus Secure Limited | Information & communication | 2021 |
| City & Regional Ltd | Real estate | 2024 |
| City and Country Property Management Limited | Construction | 2009 |
| City and County Healthcare Group Limited | Professional & scientific | 2009 |
| City and County Healthcare Holdings Limited | Financial services | 2009 |
| City Arts (Nottingham) Ltd. | Arts & recreation | 2004 |
| City Bearings & Transmission Limited | Extraterritorial | 2024 |
| City Building Solutions Limited | Administrative & support | 2012 |
| City Communications Limited | Information & communication | 2012 |
| City Cuts Barbers Ltd | Other services | 2024 |
| City Developments (Nottingham) Limited | Construction | 1986 |
| City Developments NO 1 Limited | Construction | 2007 |
| City Glow Ltd | Other services | 2025 |
| City Heights Contract Cleaning Services Limited | Administrative & support | 2019 |
| City Heights RTM Company Ltd | Other services | 2010 |
| City Hygiene Services Limited | Water & waste | 1990 |
| City Kabab Ltd | Hospitality | 2023 |
| City Lettings (UK) Limited | Real estate | 2005 |
| City Link (Notts) Vehicle Services Ltd | Wholesale & retail | 2025 |
| City Link Vehicle Services Ltd | Wholesale & retail | 2021 |
| City Nails & Spa GG Ltd | Other services | 2026 |
| City Nails & Spa JQ Ltd | Other services | 2025 |
| City of Nottingham Historic Buildings Limited | Real estate | 2018 |
| City OFF Licence 1 Ltd | Wholesale & retail | 2024 |
| City Reinforcements Limited | Construction | 2020 |
| City Removals East Midlands Ltd | Transport & logistics | 2020 |
| City Resturant Ltd | Hospitality | 2026 |
| City Services Nottingham Ltd | Other services | 2011 |
| City Shawarma Notts Ltd | Hospitality | 2026 |
| City Skyline Attractions Limited | Arts & recreation | 2022 |
| City Smiles Ltd | Health & social care | 2020 |
| City Stopovers Limited | Hospitality | 2022 |
| City Vapes Nottingham Ltd | Wholesale & retail | 2023 |
| City Veritas Limited | Information & communication | 2025 |
| CITY2AIRPORT Transport Ltd | Transport & logistics | 2025 |
| Cityboard Developments Ltd | Real estate | 2012 |
| Citycoast Construction Ltd | Construction | 2025 |
| Cityfurb Limited | Construction | 2025 |
| Citylife International Ltd | Hospitality | 2016 |
| Citypark Lettings Limited | Real estate | 2017 |
| Citypoint Trading Limited | Manufacturing | 2023 |
| Civic Haven Limited | Information & communication | 2025 |
| Civic Quarter Ltd | Hospitality | 2015 |
| Civique Ltd | Professional & scientific | 2025 |
| Civitas Living LLP | | 2018 |
| CJ Accounting Limited | Professional & scientific | 2011 |
| CJ Consilium Limited | Professional & scientific | 2006 |
| CJ Fire Consultants Ltd | Professional & scientific | 2018 |
| CJ Goodfellow Limited | Other services | 2024 |
| CJ Investments Midlands Limited | Real estate | 2020 |
| CJ Mechanical (Nottingham) Ltd | Wholesale & retail | 2022 |
| CJ Perry Properties Ltd | Real estate | 2026 |
| CJ Thomas Property Investments Limited | Real estate | 2020 |
| CJ Wiley Ltd | Hospitality | 2023 |
| CJ10 Property Limited | Real estate | 2024 |
| CJA & Co Investments Ltd | Construction | 2019 |
| Cjaj Angels Supporting Living Limited | Other services | 2014 |
| Cjanz Barbers Ltd | Other services | 2020 |
| Cjanz Estates Ltd | Real estate | 2025 |
| CJB Joinery Ltd | Construction | 2025 |
| CJB UK Property Ltd | Real estate | 2021 |
| CJC (Chadwell ST Mary) Limited | Real estate | 2019 |
| CJC (Employment) Limited | Real estate | 2005 |
| CJC Fire Compliance Ltd | Public administration | 2025 |
| CJC Pubs and Inns Ltd | Hospitality | 2021 |
| CJJ Estates Limited | Real estate | 2017 |
| CJK Installations Ltd | Construction | 2016 |
| CJM Education Limited | Education | 2024 |
| Cjmn 24/7 Ltd | Public administration | 2020 |
| Cjmw Services Ltd | Professional & scientific | 2026 |
| CJO Services (Nottingham) Limited | Construction | 2022 |
| CJP Engineering Services (Mansfield) Limited | Professional & scientific | 2013 |
| CJP Fire Protection Ltd | Public administration | 2019 |
| CJP Supply Chain Consultancy Ltd | Other services | 2020 |
| Cjpux Ltd | Professional & scientific | 2022 |
| CJR Finishings Ltd | Construction | 2024 |
| CJR Garden Maintenance Ltd | Administrative & support | 2025 |
| Cjrb Ltd | Professional & scientific | 2021 |
| CJS Capital Ltd | Financial services | 2016 |
| CJS Home Staging Ltd | Other services | 2014 |
| CJS Tree & Garden Services Limited | Agriculture & fishing | 2025 |
| CJT Futures Limited | Real estate | 2025 |
| CJV Property Solutions Ltd | Real estate | 2018 |
| CK and an Ltd | Health & social care | 2023 |
| CK Events Limited | Financial services | 2019 |
| CK Family Investments Ltd | Real estate | 2020 |
| CK Optics Limited | Health & social care | 2003 |
| CKA Ltd | Other services | 2016 |