| CWM Publishing Ltd | Information & communication | 2019 |
| Cyrille Pavy Limited | Health & social care | 2015 |
| Cyto Cord Management Ltd | Professional & scientific | 2014 |
| Cìela (Loch Ness) Ltd | Real estate | 2026 |
| D & B Fine Arts Limited | Wholesale & retail | 2020 |
| D & D Pubs and Bars Limited | Hospitality | 2019 |
| D & H Fishmongers Limited | Wholesale & retail | 2011 |
| D & R G Electrical Services Limited | Professional & scientific | 2013 |
| D a Barson Limited | Real estate | 2016 |
| D Hole Ltd | Financial services | 2018 |
| D J Watts Coach Travel Limited | Transport & logistics | 2004 |
| D L Spencer & Company Limited | Wholesale & retail | 2002 |
| D R Sicobo Enterprise Limited | Hospitality | 2016 |
| D W J Metals Limited | Wholesale & retail | 2006 |
| D Whitehouse Plumbing & Heating Services Ltd | Construction | 2014 |
| D&B Civils Ltd | Construction | 2019 |
| D&I Paediatrics Ltd | Health & social care | 2025 |
| D&S Properties SW Ltd | Real estate | 2026 |
| D'Aprano's Barber Shop (Devon) Ltd | Other services | 2023 |
| D-B Property Developers Ltd | Real estate | 2026 |
| D. Hoekstra Holdings Limited | Financial services | 2020 |
| D.J. (Devon) Ltd | Hospitality | 2019 |
| D.P.S. (SW) Limited | Wholesale & retail | 2013 |
| D.W.M Trading Limited | Wholesale & retail | 2022 |
| Dabbling Duck Properties Ltd | Hospitality | 2019 |
| Daft Software Ltd | Information & communication | 2020 |
| Dainton Court Management Company Limited | Households | 2008 |
| Daish's Hotel Limited | Hospitality | 1981 |
| Dale Property Developments Ltd | Real estate | 2024 |
| Dalijaer Ventures Limited | Financial services | 2025 |
| Dalmeny House (Torquay) Limited | Hospitality | 2005 |
| Dalskats Limited | Other services | 2010 |
| Dalverton Court Brixham Limited | Real estate | 2005 |
| Damarine Limited | Professional & scientific | 2023 |
| Damngoodexperiences Ltd | Administrative & support | 2025 |
| Dampier Research Co-Ordination Limited | Professional & scientific | 2005 |
| DAN HP Ltd | Hospitality | 2013 |
| Danby Heights Residents Association Limited | Households | 1978 |
| Danes Estates Limited | Real estate | 2024 |
| Danewood Properties Limited | Construction | 2005 |
| Daniel Hobbin Estate Agents Ltd | Real estate | 2021 |
| Daniel Real Estate Limited | Administrative & support | 2007 |
| Danmark Music Group Ltd. | Information & communication | 2005 |
| Dantl Limited | Professional & scientific | 2013 |
| Daretocare Devon Limited | Health & social care | 2026 |
| Darke Limited | Real estate | 1985 |
| Darkinbad Tools Ltd | Wholesale & retail | 2024 |
| Darlami Food Ltd | Hospitality | 2020 |
| Darmech Limited | Wholesale & retail | 2012 |
| Darnley Court (Torquay) Management Limited | Real estate | 2007 |
| Darren Leonard Limited | Construction | 2008 |
| Darren Peirce Limited | Construction | 2013 |
| Dart & Partners Holdings Limited | Financial services | 2016 |
| Dart & Partners Limited | Real estate | 2010 |
| Dart Commercials Limited | Transport & logistics | 2015 |
| Dartmoor Brewery 2022 Limited | Financial services | 2022 |
| Dartmoor Brewery Limited | Manufacturing | 1994 |
| Dartmoor Distillery Limited | Manufacturing | 2013 |
| Dartmouth Court Management Company Limited | Households | 1982 |
| Dartmouth Hilltops Limited | Households | 2015 |
| Dartmouth House (Mayors Avenue) Management Company Limited | Households | 1998 |
| Dartmouth Land Company (Management) Limited | Households | 2004 |
| Dartside Kitchens Ltd | Wholesale & retail | 2026 |
| Data Constructs Limited | Information & communication | 1987 |
| Davant Bikes Limited | Wholesale & retail | 2017 |
| David Allen Financial Services Ltd | Financial services | 2015 |
| David Haslett Ltd | Construction | 2015 |
| David Hodson Limited | Information & communication | 2016 |
| David Mitchell Accountancy Limited | Professional & scientific | 2003 |
| David Osman Limited | Professional & scientific | 1999 |
| David Pearce & SON Limited | Construction | 2004 |
| David Simpkin Agencies Limited | Wholesale & retail | 2005 |
| Davis Management Limited | Professional & scientific | 2011 |
| Davrembriand Group Ltd | Transport & logistics | 2025 |
| Dawlishious Kitchen & Takeaway Ltd | Hospitality | 2023 |
| Daylux Limited | Professional & scientific | 2021 |
| DB Auto Centre Limited | Wholesale & retail | 2024 |
| DBH Electrical Contractors Ltd | Construction | 2022 |
| DC Sports Massage Therapy Limited | Other services | 2022 |
| DCB Property Holdings Ltd | Real estate | 2026 |
| DCI Agency Ltd | Hospitality | 2025 |
| DCI Care Ltd | Administrative & support | 2017 |
| DE Vere Farms Limited | Real estate | 1995 |
| Dealerforum Limited | Information & communication | 2003 |
| Dean Burton Limited | Construction | 2015 |
| Dean Griffin Freelance Chef Service Ltd | Hospitality | 2019 |
| Dean House Care Holdings Limited | Financial services | 2024 |
| Dean House Care Limited | Health & social care | 2015 |
| Dean Prior (Management) Limited | Households | 1976 |
| Deeley Rose Ltd | Hospitality | 2025 |
| Deep Blue Interactive Digital Limited | Professional & scientific | 2025 |
| Deep Deep Clean Ltd | Administrative & support | 2019 |
| Delmonte Management Co. Limited | Real estate | 1987 |
| Delta Access I Ltd | Mining & quarrying | 2017 |
| Demac Groundworks Ltd | Construction | 2016 |
| DEN House (Teignmouth) Management Company Limited | Households | 2022 |
| Depann' Froid ET Energies Nouvelles Limited | Construction | 2017 |
| Designers House INT Limited | Real estate | 1996 |
| Designs by KEV Ltd | Information & communication | 2026 |
| Desmond Gastroenterology Ltd | Health & social care | 2019 |