| Copper Ridge Hospitality Ltd | Hospitality | 2026 |
| Core Clarity Limited | Other services | 2022 |
| Core Landscape and Construction Limited | Administrative & support | 2023 |
| Cornerstone Garage Limited | Wholesale & retail | 2003 |
| Cornwall Logistics Limited | Transport & logistics | 2017 |
| Cosmos Accounting Limited | Professional & scientific | 2021 |
| Costermonger Group Ltd | Manufacturing | 2019 |
| Cotswold Coffee & Cream Ltd | Hospitality | 2025 |
| Cottage Beer Project Limited | Manufacturing | 2020 |
| Cottex LLP | | 2013 |
| Country Build & Enabling Ltd | Construction | 2024 |
| Country Focus Limited | Professional & scientific | 2025 |
| Countymead Limited | Administrative & support | 1987 |
| Couples Therapy Ltd | Health & social care | 2022 |
| Courtenay Stamp Limited | Health & social care | 2015 |
| Courtlands (Tiverton) Management Company Limited | Households | 2017 |
| Cove Vale Consultancy Limited | Professional & scientific | 2011 |
| Cranbrook Renewables Limited | Energy | 2014 |
| Cranesland Finance Ltd | Financial services | 2026 |
| Crownview Contracts Limited | Real estate | 2002 |
| CTO Ltd | Hospitality | 2021 |
| Culm Valley Recycling Services Limited | Water & waste | 2003 |
| Culmex Construction Ltd | Construction | 2020 |
| Culmex Developments Ltd | Real estate | 2022 |
| Culmex Scaffolding Ltd | Construction | 2023 |
| Custom Fabrication Ltd | Professional & scientific | 2023 |
| Custom Restoration Ltd | Manufacturing | 2004 |
| CV Property Holdings Limited | Real estate | 2020 |
| CW Engineering (Devon) Limited | Agriculture & fishing | 2014 |
| Cyfuture UK Ltd | Information & communication | 2025 |
| D & C (SW) Ltd | Construction | 2020 |
| D & D Electrical (SW) Limited | Construction | 2010 |
| D a Wright Ltd | Construction | 1999 |
| D J Elliott Ltd | Transport & logistics | 2013 |
| D J Petherick Limited | Wholesale & retail | 2010 |
| D Perry Engineering Ltd | Professional & scientific | 2025 |
| D Wall Construction Services Limited | Construction | 2013 |
| D Wall Group Limited | Financial services | 2018 |
| D Wall Plant Hire Ltd | Administrative & support | 2018 |
| D&C Media Limited | Wholesale & retail | 2020 |
| D&M Shtark Ltd | Transport & logistics | 2025 |
| D&T Carpenters Ltd | Construction | 2017 |
| D'Erlanger and Sloan London Ltd | Wholesale & retail | 2013 |
| D. Loftus Carpentry Ltd | Construction | 2023 |
| D.H. Fergie Limited | Construction | 2000 |
| D.J. Haggett Butchers Limited | Hospitality | 1997 |
| D.M.Estates Limited | Real estate | 1972 |
| D44 Limited | Extraterritorial | 2020 |
| D44 Properties Limited | Extraterritorial | 2014 |
| D44 Store Limited | Wholesale & retail | 2004 |
| DAH Kebab Ltd | Hospitality | 2022 |
| Daily Chef Limited | Hospitality | 2023 |
| Damer Films Ltd | Information & communication | 2024 |
| Damers Road Ltd | Real estate | 2024 |
| Dampsolve Southwest Ltd. | Administrative & support | 2017 |
| Dancing Green Open Space Management Limited | Households | 2023 |
| Dand Hospitality Limited | Hospitality | 2020 |
| Daniels ICT Ltd | Wholesale & retail | 2025 |
| Dart (EXE) Valley Group C.I.C. | Professional & scientific | 2026 |
| Dart Electrics Limited | Construction | 2002 |
| Dart Electrics Renewables Limited | Construction | 2021 |
| Davie Properties Limited | Real estate | 2023 |
| Davies Investments (SW) Limited | Financial services | 2025 |
| Davies Roofing Limited | Construction | 2009 |
| Davinard Ltd | Real estate | 2016 |
| DCS Cheese Co Limited | Wholesale & retail | 2023 |
| DCS Food Group Ltd | Wholesale & retail | 2024 |
| Delightful Devon Holidays Limited | Hospitality | 2017 |
| Delta Consulting Engineers Ltd | Professional & scientific | 2018 |
| Dennis Developments Ltd | Construction | 2022 |
| Dental Nurse Training Ltd | Education | 2019 |
| Deploy IQ Ltd | Information & communication | 2025 |
| Devon 4 X 4 Centre Limited | Financial services | 1995 |
| Devon 4 X 4 Services Limited | Wholesale & retail | 1999 |
| Devon and Somerset Marquees Ltd | Administrative & support | 2002 |
| Devon Cash Comps Ltd | Arts & recreation | 2025 |
| Devon Community Foundation | Health & social care | 1996 |
| Devon Granite Limited | Construction | 2004 |
| Devon Plant Services Ltd | Administrative & support | 2006 |
| Devon Reclamation Limited | Extraterritorial | 2018 |
| Devon Renewable Energy Consultants Ltd | Professional & scientific | 2023 |
| Devon Social Finance Limited | Financial services | 2017 |
| Devon Stag Ltd | Hospitality | 2017 |
| Devon Surface Care Ltd | Administrative & support | 2017 |
| Devonparamotortraining Ltd | Education | 2026 |
| Devonshire Homes (Axminster) Limited | Construction | 2012 |
| Devonshire Homes (Belmont) Limited | Real estate | 2012 |
| Devonshire Homes (Bodmin) Limited | Construction | 2024 |
| Devonshire Homes (Halwill) Limited | Construction | 2022 |
| Devonshire Homes (Ilfracombe) Limited | Construction | 2022 |
| Devonshire Homes (Landkey) Limited | Construction | 2016 |
| Devonshire Homes (Mabe) Limited | Construction | 2022 |
| Devonshire Homes (RGI) Limited | Construction | 2023 |
| Devonshire Homes (ST Austell) Limited | Construction | 2016 |
| Devonshire Homes (Wincanton) Limited | Construction | 2023 |
| Devonshire Homes Limited | Construction | 1992 |
| Devonyork Ltd | Construction | 2014 |
| DHB Consultancy Limited | Professional & scientific | 2024 |
| Difflock.Com Ltd | Wholesale & retail | 2013 |
| Digg & Co (Landscape Architecture). Ltd. | Professional & scientific | 2016 |