| Dartmoor Distribution Ltd | Wholesale & retail | 2020 |
| Dartmoor Estates Limited | Real estate | 2021 |
| Dartmoor Foundation | Education | 2024 |
| Dartmoor Hill Pony Association Ltd | Other services | 2023 |
| Dartmoor Holdings Ltd | Wholesale & retail | 2023 |
| Dartmoor Investments Limited | Real estate | 1979 |
| Dartmoor IO Ltd | Information & communication | 2026 |
| Dartmoor Makers CIC | Manufacturing | 2023 |
| Dartmoor National Park Holdings Ltd | Real estate | 2026 |
| Dartmoor Orchard Ltd | Agriculture & fishing | 2020 |
| Dartmoor Reach Limited | Agriculture & fishing | 2020 |
| Dartmoor Scaffold Ltd | Construction | 2026 |
| Dartmoor Shoemakers Limited | Manufacturing | 2002 |
| Dartmoor Trading Limited | Professional & scientific | 2016 |
| Dartmoor Whisky Distillery Ltd | Manufacturing | 2015 |
| Dartmouth Boat Hire Ltd | Administrative & support | 2024 |
| Dartmouth Classic Motor Cycle Club Ltd | Arts & recreation | 2004 |
| Dartmouth Directory Limited | Information & communication | 1999 |
| Dartmouth Food Festival Limited | Hospitality | 2011 |
| Data Readiness Collective Limited | Information & communication | 2026 |
| Datatailr Ltd | Information & communication | 2020 |
| Datel Electrical Limited | Construction | 2010 |
| Davack Limited | Health & social care | 2007 |
| Dave Cope Limited | Administrative & support | 2003 |
| David Ayliffe Ropework Ltd | Transport & logistics | 2013 |
| David Clapp Photography Limited | Professional & scientific | 2015 |
| Davies Palmer Developments Limited | Construction | 2025 |
| Davies Power Services Ltd | Manufacturing | 2025 |
| Davis & Harding Limited | Professional & scientific | 2026 |
| Davis-Gray Accounts and Bookkeeping Limited | Professional & scientific | 2020 |
| Dawes Accountants (Saltash) Limited | Professional & scientific | 2025 |
| Dawes Accountants Limited | Professional & scientific | 2018 |
| Dawlish Health Limited | Health & social care | 2015 |
| Dawlish Medical Limited | Health & social care | 2007 |
| Dawsey Developments Ltd | Construction | 2021 |
| Day to Day Limited | Professional & scientific | 2006 |
| DBR Inc Ltd | Construction | 2023 |
| DC Conversions Ltd | Manufacturing | 2023 |
| DC Services Electrical Contractor Ltd | Construction | 2019 |
| DCF Scaffolding Limited | Construction | 2025 |
| DCS Training Limited | Education | 2010 |
| DDC Scaffolding Ltd | Construction | 2018 |
| DDL Delivery Ltd | Transport & logistics | 2025 |
| DDP Workshop Ltd | Wholesale & retail | 2012 |
| DDV Audio Limited | Extraterritorial | 2007 |
| DE MEL Group Limited | Professional & scientific | 1998 |
| DE Rougemont Manor Ltd | Hospitality | 2011 |
| Debutfast Limited | Real estate | 1985 |
| Decipher Properties Limited | Hospitality | 2024 |
| Decipher Public Relations Limited | Information & communication | 1999 |
| DEEBLUE454 Ltd | Information & communication | 2026 |
| Deep Springs Pictures Limited | Administrative & support | 2019 |
| Deerfield Park Ltd | Transport & logistics | 2017 |
| Defendoor by Fabframes Limited | Manufacturing | 2018 |
| Deity Dreads Synthetic Hair Supplies Ltd | Wholesale & retail | 2026 |
| Delta Hawk Products Ltd | Wholesale & retail | 2023 |
| Delta Taxis (Newton Abbot) Ltd | Transport & logistics | 2023 |
| Delta Taxis (South Devon) Ltd | Transport & logistics | 2023 |
| Denbury (Holdings) Limited | Financial services | 2011 |
| Denbury Developments Limited | Real estate | 2011 |
| Denbury Green Limited | Professional & scientific | 2026 |
| Denis Bilkey Limited | Construction | 2010 |
| Dennis & Gemmill International & Partners Limited | Administrative & support | 1999 |
| Denvale Limited | Administrative & support | 2003 |
| Dermashine Healthcare Ltd | Health & social care | 2014 |
| Design Print Media Ltd | Information & communication | 2014 |
| Design-Build SW Ltd | Construction | 2020 |
| Designer Outlet Store Ltd | Wholesale & retail | 2021 |
| Devfin Limited | Professional & scientific | 2014 |
| Devinity Ltd | Information & communication | 2018 |
| Devon & Cornwall Premier Kitchen Cleaning Services Ltd | Administrative & support | 2022 |
| Devon & Cornwall Tarmacadam Limited | Construction | 2019 |
| Devon Active Health Limited | Health & social care | 2026 |
| Devon Aesthetic Clinic Limited | Other services | 2023 |
| Devon and Cornwall Customer Insights Ltd | Administrative & support | 2025 |
| Devon and Cornwall Telecom Ltd | Wholesale & retail | 2019 |
| Devon Boiler Services Ltd | Professional & scientific | 2017 |
| Devon Bookkeeping Limited | Administrative & support | 2011 |
| Devon Breast Surgery Limited | Health & social care | 2018 |
| Devon Builders Ltd | Construction | 2019 |
| Devon Building Control Limited | Professional & scientific | 2014 |
| Devon Care Association Ltd | Administrative & support | 2022 |
| Devon Care Homes Collaborative Ltd | Administrative & support | 2020 |
| Devon Climate Solutions Limited | Energy | 2025 |
| Devon Coast Distillery Limited | Manufacturing | 2018 |
| Devon Construction Training Limited | Administrative & support | 2005 |
| Devon Cottage Creations Limited | Construction | 2014 |
| Devon Cottage Holiday Dreams Ltd | Hospitality | 2025 |
| Devon Counselling College Limited | Education | 2023 |
| Devon County F a Property Management Limited | Arts & recreation | 2009 |
| Devon County Football Association Limited | Arts & recreation | 1999 |
| Devon County Paving Specialist’S Ltd | Construction | 2022 |
| Devon DJ Ltd | Arts & recreation | 2019 |
| Devon Eco Energy Ltd | Construction | 2011 |
| Devon Electrical Contractors Limited | Construction | 2009 |
| Devon Electrical Ltd | Administrative & support | 2008 |
| Devon Engineering Limited | Manufacturing | 2016 |
| Devon Engineering Services Ltd | Professional & scientific | 2022 |
| Devon Enterprises Limited | Information & communication | 2025 |
| Devon Escape Ltd | Arts & recreation | 2017 |