| C Varley Properties Ltd | Real estate | 2020 |
| C W Lawson Contractors Limited | Construction | 2023 |
| C W Specialist Consultancy Ltd | Professional & scientific | 2026 |
| C&A Retention Ltd | Information & communication | 2025 |
| C&C Acoustic Vintage Retail Ltd | Wholesale & retail | 2022 |
| C&C Bidco Limited | Financial services | 2013 |
| C&C Etrade Limited | Wholesale & retail | 2025 |
| C&C Holdco Limited | Financial services | 2013 |
| C&C Midco Limited | Financial services | 2013 |
| C&C Topco Limited | Financial services | 2013 |
| C&Co Property Investments Ltd | Real estate | 2023 |
| C&D Property Group Ltd | Real estate | 2025 |
| C&K Davis Drinks Ltd | Hospitality | 2015 |
| C&L Group Ltd | Wholesale & retail | 2018 |
| C&M (Midlands) Ltd | Water & waste | 2014 |
| C&M (Small Building Works) Limited | Construction | 2017 |
| C&M Foods Ltd | Wholesale & retail | 2025 |
| C&M Heating (Midlands) Limited | Wholesale & retail | 2025 |
| C&O Storage Ltd | Administrative & support | 2025 |
| C&P Co Notts Ltd | Professional & scientific | 2025 |
| C&S Maintenance Works Ltd | Construction | 2017 |
| C&V Property Management Limited | Financial services | 2025 |
| C-Rod Holdings Ltd | Financial services | 2024 |
| C-T Boiler Installations Ltd | Construction | 2025 |
| C-Tech Mobile Ltd | Other services | 2024 |
| C. Alexander Financial Planning Limited | Financial services | 2014 |
| C. Alexander Sports Limited | Professional & scientific | 2004 |
| C. Bancroft Limited | Financial services | 1987 |
| C. Brumpton Butchers Limited | Wholesale & retail | 2006 |
| C. Clarke Limited | Professional & scientific | 2019 |
| C. Wilson Roofing Limited | Construction | 2014 |
| C.A.S. Marketing Communications Limited | Professional & scientific | 1992 |
| C.C. Property Associates Limited | Real estate | 2023 |
| C.D.F. Properties Investment Ltd | Real estate | 2001 |
| C.F.G. (Nottingham) Ltd. | Wholesale & retail | 1999 |
| C.G.Templer & Co.Limited | Real estate | 1949 |
| C.I.C.N Artisans Limited | Administrative & support | 2014 |
| C.J. Hodgkins Limited | Construction | 2004 |
| C.J.Neale Limited | Agriculture & fishing | 1958 |
| C.L Consultancy Limited | Professional & scientific | 2024 |
| C.L.Strett Ltd | Administrative & support | 2025 |
| C.L.W. Electrical Distributors Limited | Wholesale & retail | 1995 |
| C.M. Aesthetics Nottingham Ltd | Other services | 2026 |
| C.M. Johnson Electrical Services Limited | Construction | 2026 |
| C.M. Supplies Limited | Manufacturing | 1994 |
| C.M.D (Stourbridge) Limited | Wholesale & retail | 2005 |
| C.O. Siwy Janiks Transport Ltd | Transport & logistics | 2025 |
| C.Otoide Ltd | Public administration | 2024 |
| C.P. Tech-Sol Limited | Administrative & support | 2009 |
| C.R Brown Nottingham Limited | Manufacturing | 2004 |
| C.R.E.M.E. (Industrial Solutions) Ltd | Manufacturing | 2013 |
| C.S.R. Engineering Group Limited | Manufacturing | 2017 |
| C.U. Nails Ltd | Other services | 2025 |
| C13 Estates Ltd | Construction | 2019 |
| C13 Holdings Ltd | Financial services | 2020 |
| C13 Lets Ltd | Real estate | 2020 |
| C13 Properties Ltd | Real estate | 2020 |
| C2 Business & Media Limited | Information & communication | 2011 |
| C2 Engine Ltd | Information & communication | 2023 |
| C2J Projections Limited | Administrative & support | 2016 |
| C2RE Care Solutions Ltd | Health & social care | 2024 |
| C2RE Property Development Ltd | Real estate | 2021 |
| C2RE Recruitment Limited | Administrative & support | 2024 |
| C3 Management Limited | Information & communication | 2009 |
| C4 Investments Limited | Real estate | 2017 |
| C4RS Ltd | Wholesale & retail | 2025 |
| CA Clinic Ltd | Health & social care | 2026 |
| CA Construction (East Midlands) Limited | Construction | 2025 |
| CA Construction Services Ltd | Construction | 2026 |
| CA Gatter Investments Ltd | Real estate | 2022 |
| CA Luxe Living Ltd | Real estate | 2025 |
| CA Pro Coaching Ltd | Arts & recreation | 2024 |
| CA Property (East Midlands) Limited | Real estate | 2025 |
| Caaw (Midlands) Limited | Administrative & support | 2015 |
| Caaw Projects Ltd | Construction | 2021 |
| CAB Ventures Limited | Administrative & support | 2014 |
| Caberbuild Ltd | Construction | 2023 |
| Cabindrive Limited | Professional & scientific | 2002 |
| Cabingo Ltd | Transport & logistics | 2025 |
| Cable Guys Ltd | Construction | 2006 |
| Cable Install Services Limited | Construction | 2013 |
| Cable-Tec Cables & Controls Limited | Wholesale & retail | 1988 |
| CAC NG Ltd | Wholesale & retail | 2024 |
| CAC Retail Limited | Wholesale & retail | 2020 |
| Cache Medical Ltd | Health & social care | 2022 |
| Caco Propertys Ltd | Real estate | 2020 |
| Cactus Rose Limited | Information & communication | 2024 |
| CAD 3D Limited | Extraterritorial | 1995 |
| CAD CAM CNC Ltd. | Professional & scientific | 2017 |
| Cada One Design Limited | Administrative & support | 2014 |
| Cadenza Eventing Limited | Arts & recreation | 2002 |
| Cadeross Limited | Wholesale & retail | 2025 |
| Cadmus Dental Care Ltd | Health & social care | 2013 |
| Cadxtra Ltd | Professional & scientific | 2004 |
| Caeco Ltd | Information & communication | 2026 |
| Caeli Software Ltd | Administrative & support | 2020 |
| Caelyn & Francis Ltd | Wholesale & retail | 2023 |
| Caemak Limited | Professional & scientific | 2022 |
| Caerphilly Funeral Services Limited | Other services | 2004 |
| Caerus Property Holdings Ltd | Real estate | 2021 |