| Cocoon Group Limited | Financial services | 2008 |
| Cocoon Health and Wellbeing Limited | Arts & recreation | 2020 |
| Cocoon Vehicles Limited | Administrative & support | 2007 |
| Coffee & Benana's Ltd | Hospitality | 2025 |
| Coleshill Engineering Limited | Professional & scientific | 1999 |
| Comic Moon Limited | Wholesale & retail | 2024 |
| Comp SEC Services Limited | Professional & scientific | 2004 |
| Compass Cathways Care Limited | Health & social care | 2026 |
| Compass Consulting & Communications Limited | Information & communication | 2017 |
| Complete Car Cosmetics (Derby) Limited | Wholesale & retail | 2024 |
| Complete Software Solutions Ltd | Information & communication | 2017 |
| Complete Support Solutions Ltd | Information & communication | 2024 |
| Comply Right Inspections Ltd | Real estate | 2026 |
| Concentrates Direct Limited | Wholesale & retail | 2017 |
| Concept Group Holdings (Midlands) Limited | Professional & scientific | 2011 |
| Concept One Source Electrical Limited | Construction | 2024 |
| Concept One Source Security Limited | Administrative & support | 2024 |
| Concept One Source Solution Ltd | Manufacturing | 2008 |
| Conceptual Project Management Limited | Professional & scientific | 2021 |
| Conjugation Ltd | Manufacturing | 2021 |
| Connection Works Education Consultancy Ltd | Manufacturing | 2016 |
| Connor Property Ltd | Financial services | 2020 |
| Conscious HR Ltd | Administrative & support | 2025 |
| Conseil Building Consultancy Ltd | Construction | 2024 |
| Consult First Services Limited | Administrative & support | 2022 |
| Continental Food Bar Limited | Hospitality | 2023 |
| Controlled Waste Limited | Construction | 2017 |
| Convequity Ltd | Financial services | 2019 |
| Corner Deli Limited | Wholesale & retail | 2021 |
| Corporate Health & Safety Solutions Ltd | Professional & scientific | 2016 |
| Cotes Park Cutting Limited | Other services | 2009 |
| Cotton Residential Limited | Construction | 2007 |
| County Contract Flooring Limited | Construction | 2004 |
| County Town Properties (Durham) Limited | Real estate | 1990 |
| Courtyard Properties (Belper) Limited | Real estate | 2020 |
| Craig Holdings Limited | Administrative & support | 2023 |
| Cranfield Consultants Ltd | Professional & scientific | 2025 |
| Creak Investments Limited | Real estate | 2016 |
| Create & Connect Wellbeing C.I.C. | Education | 2024 |
| Created With Fairy Dust Ltd | Wholesale & retail | 2022 |
| Creative Filter Limited | Professional & scientific | 2016 |
| Creative Holistic Space Limited | Real estate | 2023 |
| Crepello Car and Commercial Limited | Wholesale & retail | 2019 |
| Crescent Flooring Solutions Limited | Construction | 2022 |
| Crest Ltd | Wholesale & retail | 2006 |
| Crich Brewing Company Limited | Manufacturing | 2023 |
| Crich Lane 1968 Limited | Extraterritorial | 2014 |
| Crich Lane 1970 Limited | Extraterritorial | 2014 |
| Croots Farm Shop Limited | Manufacturing | 2004 |
| Cross Keys Property Management Company Limited | Households | 2022 |
| Crystal Clear EAR WAX Removal Ltd | Health & social care | 2024 |
| CS Consultancy (Belper) Ltd | Professional & scientific | 2025 |
| CS4L Limited | Information & communication | 2013 |
| CSW Stats Ltd | Information & communication | 2026 |
| Cuban Soul Ltd | Information & communication | 2013 |
| Culson Psychotherapy Ltd | Health & social care | 2022 |
| Culturesync Ltd | Information & communication | 2025 |
| Currant Plan Ltd | Construction | 2025 |
| Curzon Court Duffield Limited | Real estate | 1998 |
| Custom Chemical Supplies Ltd | Manufacturing | 2014 |
| Custom Patterns Ltd | Manufacturing | 2017 |
| Cutting Edge Timber Ltd | Agriculture & fishing | 2023 |
| CV Design & Renovation Ltd | Professional & scientific | 2024 |
| CYBER1ST Limited | Information & communication | 2013 |
| CYBER1ST R&D Limited | Information & communication | 2013 |
| D Byrne Consulting Ltd | Other services | 2019 |
| D C Taylor's Property Limited | Real estate | 2026 |
| D FOX Flooring Ltd | Construction | 2012 |
| D J M Consultants Ltd | Administrative & support | 2006 |
| D K Global Consulting Ltd | Professional & scientific | 2012 |
| D Melbourne Electrical Services Limited | Other services | 2018 |
| D Nelson Engineering Ltd | Professional & scientific | 2011 |
| D Nelson Property Services Limited | Extraterritorial | 2016 |
| D Salt Electrical Ltd | Construction | 2014 |
| D. Butler Management Ltd | Construction | 2024 |
| D. Sullivan Limited | Wholesale & retail | 2005 |
| D.G.B. Transport Limited | Transport & logistics | 2014 |
| D.G.Hurt (Lammas Partnership) | | 1988 |
| DAN French Limited | Information & communication | 2012 |
| Daneglans Hydro Limited | Energy | 2018 |
| Daniel C Martin Ltd | Professional & scientific | 2005 |
| Daniel Malik Driving and Contracting Services Ltd | Transport & logistics | 2011 |
| Dark Horse Mindset Ltd | Professional & scientific | 2026 |
| Darren Cartwright Landscaping and Garden Maintenance Limited | Administrative & support | 2025 |
| Dave & Ange (T/A the Black BOY) Ltd | Hospitality | 2026 |
| David Guard Financial Services Limited | Financial services | 2006 |
| David Hudson Cabs (Derby) Ltd | Transport & logistics | 2007 |
| David James Barbering Limited | Other services | 2022 |
| David Michael Group Limited | Financial services | 2021 |
| David Miko Ltd | Information & communication | 2021 |
| David Mitchell Howard Limited | Professional & scientific | 2024 |
| David Sellers Plumbing & Heating Ltd | Construction | 2014 |
| David Whitehurst Racing Limited | Manufacturing | 2013 |
| DC Sunlight Ltd | Real estate | 2022 |
| DC Taylor Properties Limited | Real estate | 2026 |
| DC Wells Autos Ltd | Manufacturing | 2013 |
| DCL Consulting (Midlands) Limited | Professional & scientific | 2012 |
| DCT Maintenance Services Limited | Administrative & support | 2026 |
| DCT Property Management Limited | Real estate | 2026 |
| DDR Investments Limited | Households | 2019 |