| CMJ Crane Services Ltd | Manufacturing | 2016 |
| CMP Legal Limited | Professional & scientific | 2020 |
| CMS Plastering & Rendering Ltd | Construction | 2026 |
| Cncrotary.Com Limited | Wholesale & retail | 2019 |
| CNH UK Ventures Limited | Wholesale & retail | 2023 |
| CNS Media EOT Limited | Financial services | 2021 |
| CNS Media Holdings Limited | Financial services | 2019 |
| CNS Media Ltd | Professional & scientific | 2006 |
| Co.M&D UK Ltd | Construction | 2023 |
| Coached for Life Ltd | Other services | 2025 |
| Coaches Across Continents Limited | Administrative & support | 2008 |
| Coakley Construction Ltd | Construction | 2021 |
| Coakley Goodwin Group Ltd | Financial services | 2026 |
| Coakley Goodwin Plant Ltd | Administrative & support | 2026 |
| Coakley Properties Limited | Extraterritorial | 2021 |
| Coal Merchants' Federation (Great Britain) Limited | Professional & scientific | 1986 |
| Coates Care Limited | Health & social care | 2010 |
| Coates Holdings (Chesterfield) Ltd | Financial services | 2022 |
| Coboanas Limited | Financial services | 2026 |
| Cobra Chemicals Ltd | Manufacturing | 2025 |
| Coburns Financial & Investment Consultants L.P. | | 1999 |
| Coco Fourteen Limited | Other services | 2020 |
| Coco Hairdressing Ltd | Other services | 2024 |
| COD World Limited | Hospitality | 2025 |
| Code.Eighty-Two Ltd | Hospitality | 2024 |
| Codefy Ltd | Information & communication | 2023 |
| Coefficient Brake Services Ltd | Wholesale & retail | 2012 |
| Coffee Grinding Solutions Ltd | Wholesale & retail | 2024 |
| Coffee Stop Cafe Ltd | Hospitality | 2016 |
| COFFEE@81 Ltd | Hospitality | 2025 |
| Cohere Management Limited | Construction | 2018 |
| Coin Analysis Limited | Information & communication | 2025 |
| Cokelly Limited | Financial services | 2026 |
| Coldpod Podiatry and Therapies Limited | Health & social care | 2016 |
| Collectus. NET Ltd | Wholesale & retail | 2004 |
| Collins Hall Business Solutions Limited | Professional & scientific | 2022 |
| Colmere Clothing Ltd | Wholesale & retail | 2020 |
| Colourhill (Chesterfield) Limited | Construction | 2021 |
| Colpod Movement Limited | Other services | 2024 |
| Colton Commercial Limited | Real estate | 2024 |
| Comfortz Leisure Ltd | Manufacturing | 2013 |
| Commercial Cleaning Products Limited | Administrative & support | 2023 |
| Commercial Dishwasher Solutions Limited | Manufacturing | 2010 |
| Commercial Glazing Projects Ltd | Construction | 2020 |
| Commercial Office Solutions Limited | Wholesale & retail | 1980 |
| Commercial Vehicle Electronics Ltd | Wholesale & retail | 2020 |
| Commercial Vehicle Logistics Limited | Wholesale & retail | 2000 |
| Commercial Vehicle Parts Limited | Wholesale & retail | 2020 |
| Common Objects Consultancy Limited | Information & communication | 2024 |
| Common Objects Technology Limited | Information & communication | 2020 |
| Commonbond Architects Limited | Professional & scientific | 2021 |
| Communication in B.S.L Limited | Professional & scientific | 2011 |
| Community Grocer Limited | Wholesale & retail | 2025 |
| Community Growth CIC | Education | 2015 |
| Community Homes Group Limited | Real estate | 2025 |
| Community Rehabilitation Management Limited | Health & social care | 2005 |
| Comparewithpang.Com Ltd | Financial services | 2018 |
| Compass Care Derbyshire Ltd | Health & social care | 2022 |
| Compass Mobility Consultants Limited | Transport & logistics | 2006 |
| Compassionate Humans Ltd | Professional & scientific | 2023 |
| Complete Building Solutions (Chesterfield) Limited | Other services | 2017 |
| Complete Freedom Mobility Ltd | Other services | 2011 |
| Complete Kitty Rescue C.I.C. | Other services | 2026 |
| Complete Madness Limited | Arts & recreation | 2000 |
| Complete Telecommunications Services Ltd | Information & communication | 2024 |
| Complex Simplicity Ltd | Other services | 2022 |
| Compliant Consultancy Ltd | Professional & scientific | 2018 |
| Compliant Homes Ltd | Administrative & support | 2026 |
| Composite Trading Limited | Construction | 2014 |
| Composites Connections Limited | Administrative & support | 2021 |
| Compton Repairs Ltd | Wholesale & retail | 2018 |
| Compuprint Solutions Limited | Administrative & support | 2012 |
| Computer Automation Technology Limited | Information & communication | 1983 |
| Computer Response Limited | Information & communication | 2019 |
| Conarken Group Limited | Transport & logistics | 1981 |
| Concealed Integrated Systems Company Ltd | Wholesale & retail | 2019 |
| Concentia Capital Limited | Manufacturing | 2011 |
| Conceptr-Property Limited | Real estate | 2025 |
| Conceptunet Holdings Ltd | Financial services | 2015 |
| Conceptunet Ltd | Information & communication | 1997 |
| Coney Green Developments (Clay Cross) Limited | Real estate | 2006 |
| Confidential Financial Planning Limited | Financial services | 2009 |
| Connard and SON Limited | Wholesale & retail | 1898 |
| Connislow Consulting Limited | Construction | 2012 |
| Connislow Investments Limited | Extraterritorial | 2012 |
| Considered Care Ltd | Health & social care | 2025 |
| Consistent Quality Support Ltd | Health & social care | 2019 |
| Consistent Quality Training Limited | Public administration | 2022 |
| Construction Estimating Consultants Ltd | Professional & scientific | 2021 |
| Construction Megastore Limited | Wholesale & retail | 2023 |
| Construction Training Skills Ltd | Construction | 2021 |
| Contract Recovery Solutions Limited | Administrative & support | 2010 |
| Controlpoint Limited | Professional & scientific | 2016 |
| Contronik Limited | Manufacturing | 1985 |
| Convertex Limited | Manufacturing | 1999 |
| Conveyancing Administration Limited | Administrative & support | 2024 |
| Conveyancing Management Solutions Limited | Other services | 2019 |
| Conveyor Systems (UK) Limited | Manufacturing | 2000 |
| Cooking Cooks Ltd | Manufacturing | 2014 |
| Cool Concepts Air CON Ltd | Construction | 2010 |