| Confiance Logistics Ltd | Transport & logistics | 2025 |
| Conseco Limited | Professional & scientific | 2000 |
| Constantin CC Ltd | Construction | 2015 |
| Construction Industry Training Academy Ltd | Education | 2015 |
| Consulther Limited | Professional & scientific | 2020 |
| Consumable Consultancy and Supplies Ltd | Wholesale & retail | 2022 |
| Contract QP Resource Limited | Wholesale & retail | 2014 |
| Conveyor Systems Holdings Ltd | Administrative & support | 2021 |
| Conveyor Systems Limited | Administrative & support | 1997 |
| Cooke Solutions Limited | Administrative & support | 2018 |
| Cope Homes Ltd | Real estate | 2024 |
| Cope Project Management Ltd | Information & communication | 2025 |
| Copper & Clover Ltd | Hospitality | 2019 |
| Core Culture Partners Ltd | Administrative & support | 2021 |
| Core Values Services Ltd | Water & waste | 2021 |
| Cornerstone Compliance Services Limited | Transport & logistics | 2026 |
| Cornhill Gardens (Cannock) Management Company Limited | Households | 2025 |
| Cornsy Limited | Wholesale & retail | 2026 |
| Coronation 1959 Limited | Extraterritorial | 2013 |
| Corrlex Ltd | Wholesale & retail | 2025 |
| Cosmin Transport Ltd | Transport & logistics | 2012 |
| Cossington Grange Management Company Limited | Households | 2012 |
| Cotgrove Grange (Aldridge) Management Company Limited | Households | 2016 |
| Coton Consultants Limited | Information & communication | 2012 |
| Coton House Farm Management Company Limited | Households | 2021 |
| Cotswold Timber and Logging Limited | Wholesale & retail | 2023 |
| Cottage Inns Leisure Limited | Hospitality | 2019 |
| Cottenham (Rampton Road) Management Company Limited | Households | 2022 |
| Cotton Transport & Sons Limited | Transport & logistics | 1967 |
| Coucal Limited | Information & communication | 2016 |
| Coughlans Limited | Professional & scientific | 2025 |
| Coventry Gardens Residents Management Company Limited | Households | 2013 |
| Coxden Ltd | Hospitality | 2023 |
| CR Lawn Mower Services Ltd | Other services | 2025 |
| Crafted Systems Ltd | Administrative & support | 2015 |
| Crafty Miskella Limited | Wholesale & retail | 2020 |
| Creator Coreforge UK Ltd | Information & communication | 2025 |
| Crestwood Interlinings Ltd | Manufacturing | 2020 |
| Crowdhill Green Management Company Limited | Households | 2016 |
| Crown & Clean Ltd | Administrative & support | 2025 |
| Crownick Woods Ltd | Hospitality | 2017 |
| Crresswell Limited | Wholesale & retail | 2025 |
| CRS Truck Exports Ltd | Wholesale & retail | 2008 |
| Crutchlow Properties Ltd | Real estate | 2025 |
| CS Commissioning Ltd | Professional & scientific | 2026 |
| CSM Controls Limited | Information & communication | 2025 |
| CT Accountancy Services Limited | Professional & scientific | 2020 |
| CT Industrial Roofing and Cladding Limited | Construction | 2016 |
| CTB Properties Limited | Real estate | 2024 |
| Cubix Group (UK) Ltd | Households | 2026 |
| Cubs Corner Childminding Ltd | Health & social care | 2022 |
| Cullen AI Systems Ltd | Information & communication | 2026 |
| Cummons Properties Limited | Real estate | 2014 |
| Curzon Concrete Ltd | Manufacturing | 2025 |
| Curzon Glazing Transport Ltd | Transport & logistics | 2012 |
| Curzon Plant Hire Ltd | Construction | 2018 |
| CW Design & Construct Ltd | Construction | 2019 |
| Cygnets Rest (Drakes Broughton) Management Company Limited | Households | 2025 |
| Cyteq Ltd | Construction | 2016 |
| D & J Derby Limited | Hospitality | 2021 |
| D G Business Machines Limited | Wholesale & retail | 2001 |
| D G M Derbyshire Ltd | Construction | 2023 |
| D J Powell Ltd | Information & communication | 2025 |
| D P Integrated Services Ltd | Professional & scientific | 2014 |
| D R Aesthetics (Midlands) Limited | Health & social care | 2021 |
| D Sergeant Plumbing & Heating Services Limited | Construction | 2004 |
| D W-P (Holdings) Ltd | Transport & logistics | 2016 |
| D&S Properties UK Limited | Real estate | 2004 |
| D&S Recruitment Ltd | Manufacturing | 2021 |
| D. G. Hartshorn Ltd | Wholesale & retail | 2026 |
| D.Green Transport Limited | Transport & logistics | 2025 |
| D.K Development & Refurbishments Ltd | Construction | 2015 |
| D.S.K. Engineering Services (Midlands) Limited | Manufacturing | 1991 |
| DAA Swad Ltd | Hospitality | 2024 |
| DAD Games Construct Ltd | Information & communication | 2024 |
| Dadex Transport Limited | Wholesale & retail | 2016 |
| Dadgame Construct Ltd | Construction | 2023 |
| Daisy Lodges Ltd | Real estate | 2025 |
| Dales View (Brailsford) Management Company Limited | Households | 2015 |
| Dales View (Phase 2) Management Company Limited | Households | 2017 |
| Damon Properties Holdings Limited | Financial services | 2024 |
| Damon Properties Ltd | Extraterritorial | 2021 |
| Danagri Ltd | Construction | 2022 |
| Danex Holdings Ltd | Financial services | 2023 |
| Danex Property Ltd | Real estate | 2023 |
| Daniel Software Limited | Information & communication | 1995 |
| Daniel White Composites Ltd | Manufacturing | 2023 |
| Danum House Ltd | Hospitality | 2026 |
| DAP Welding Limited | Construction | 2025 |
| Daray Limited | Wholesale & retail | 2004 |
| Darcel Consulting Ltd | Professional & scientific | 2010 |
| Darin Barber 2 Derbyshire Ltd | Other services | 2024 |
| Darin Barbers(Derbyshire) Ltd | Other services | 2019 |
| Darrall and Dodd Print Limited | Administrative & support | 2006 |
| Dave Kitson Consultancy Ltd | Professional & scientific | 2011 |
| Dave’S Property Maintenance & Handyman Services Ltd | Construction | 2026 |
| David Wain Insurance Services Limited | Financial services | 2003 |
| Davis Ventures Group Ltd | Financial services | 2025 |
| Davison Farming LLP | | 2018 |
| Dawid Trans Ltd | Transport & logistics | 2015 |