| Bracken Court (Farringdon) Limited | Households | 2013 |
| Bramblebuzz Limited | Professional & scientific | 2013 |
| Bright Stars Occupational Therapy Ltd | Health & social care | 2023 |
| Brinkburn Court Sidmouth Limited | Households | 2010 |
| Brydian Freehold Limited | Households | 2005 |
| Budleigh Salterton Cricket Club Limited | Arts & recreation | 2011 |
| Busby Estates Limited | Real estate | 2024 |
| C J Please Limited | Transport & logistics | 2011 |
| CAN CAN Quizzes Limited | Other services | 2010 |
| Canter Equity Partners LLP | | 2009 |
| Car MOD Shop Ltd | Wholesale & retail | 2010 |
| Cardssor Limited | Wholesale & retail | 2003 |
| Carinas Nightclub Limited | Hospitality | 2015 |
| Carlton Mansions (Sidmouth) Limited | Households | 1985 |
| Carlton Mansions Management Company Limited | Households | 1989 |
| Cartwright Case Management Limited | Professional & scientific | 2014 |
| CBE Devon Limited | Professional & scientific | 2018 |
| CD Electrical & Lighting Limited | Information & communication | 2007 |
| Cehca Limited | Health & social care | 2022 |
| Centre for Constructivist Learning and Pedagogy Limited | Education | 2025 |
| Champers Ltd | Wholesale & retail | 2021 |
| Charnley & James Ltd. | Professional & scientific | 1996 |
| Chesil Court Residents Company Limited | Households | 1989 |
| Chrian Developments Ltd. | Professional & scientific | 1998 |
| Citing Consultancy Ltd | Professional & scientific | 2020 |
| City of Poetry Limited | Information & communication | 2012 |
| Cityscape Homes Limited | Extraterritorial | 2000 |
| Cityscape Urban Renewal Limited | Other services | 2014 |
| Clappentail Estates Company Limited | Households | 1983 |
| Clos Capital Limited | Professional & scientific | 2014 |
| Cloud 9 Technologies Ltd | Information & communication | 2010 |
| COAST2COAST Carpentry and Construction LLP | | 2026 |
| Coastline Mobility Limited | Wholesale & retail | 2019 |
| Cobra Solutions Group Limited | Administrative & support | 2017 |
| Collisioniq Consulting Ltd | Professional & scientific | 2026 |
| Combined Networks (Services) Ltd | Construction | 2026 |
| Company 100 Limited | Professional & scientific | 2016 |
| Concord Engineering Systems Ltd | Professional & scientific | 2007 |
| Confsmart Ltd | Administrative & support | 2017 |
| Connect Marketing Group Ltd | Hospitality | 2020 |
| Contemporary Motors Limited | Real estate | 1962 |
| Context Logic Limited | Professional & scientific | 2006 |
| Contextual Data Solutions Limited | Information & communication | 2024 |
| Cool Dog App Limited | Information & communication | 2023 |
| Coram Court General Management Limited | Households | 2002 |
| Coram Manor Management Limited | Households | 2002 |
| Corfield Engineering Services Ltd | Manufacturing | 2024 |
| Cotford Court Management Company Limited | Real estate | 2010 |
| Cottington Court Freehold Limited | Households | 1976 |
| Counterpoise Wellness Ltd | Other services | 2020 |
| Cousins Taste Ltd | Hospitality | 2024 |
| Cozens Leisure LLP | | 2013 |
| Crafty Cleaver Ltd | Wholesale & retail | 2025 |
| Crane and Kind Limited | Wholesale & retail | 2018 |
| Cranford Hills Property Management Company Limited | Households | 2006 |
| Creative Arts Academy Ltd | Administrative & support | 2024 |
| Crimplefine Limited | Real estate | 1976 |
| Crofty Developments Limited | Real estate | 2003 |
| Curzon House (Sidmouth) Management Limited | Households | 2001 |
| D Bowden Contracting Limited | Construction | 2015 |
| D White Farms Limited | Agriculture & fishing | 2013 |
| D&P Cricket UK Limited | Wholesale & retail | 2015 |
| D.W. Hill Limited | Construction | 2001 |
| D2C Solutions Limited | Construction | 2015 |
| Daisy Chain Nursery and Preschool Ltd | Health & social care | 2026 |
| Daldevon Properties Limited | Real estate | 2017 |
| Dave Foreman Agencies Limited | Wholesale & retail | 2020 |
| David Thompson Enterprises Ltd | Agriculture & fishing | 1989 |
| Deans Taxis Limited | Transport & logistics | 2013 |
| Deltaforce Data Limited | Information & communication | 1995 |
| Demand GEN Consultancy Ltd | Professional & scientific | 2024 |
| Denleys Agricultural Engineers Limited | Manufacturing | 2003 |
| Designer Banquet Limited | Hospitality | 2023 |
| Devon Estates Limited | Construction | 2016 |
| Devon Shutter Company Limited | Construction | 2007 |
| Devon Wave Trading Company Limited | Hospitality | 2021 |
| Diamare Conscious Creations Ltd | Financial services | 2021 |
| Diamond Dog Productions Limited | Information & communication | 2008 |
| Diamond-H Resources Ltd | Administrative & support | 2021 |
| Dimestream Data Limited | Information & communication | 1993 |
| Dorethcare Limited | Health & social care | 2024 |
| Dormer Developments Limited | Real estate | 2002 |
| Downe Hall Management Company Limited | Households | 1998 |
| Dowsing CS Limited | Professional & scientific | 2021 |
| Drainserve Limited | Administrative & support | 2018 |
| Drake House Residents Association Limited | Households | 1978 |
| Drupe Farm Management Company Limited | Real estate | 2002 |
| Dunscombe Manor Limited | Hospitality | 2002 |
| Dunsinane Management (Exmouth) Limited | Households | 2014 |
| Eaglehurst Court (Sidmouth) Limited | Households | 1979 |
| Eaglehurst Lodge (Sidmouth) Limited | Hospitality | 1979 |
| East Checkstone Management Company Limited | Households | 2001 |
| East Devon Building & Maintenance Ltd | Construction | 2023 |
| East Devon Garage Ltd. | Wholesale & retail | 2013 |
| East Devon Installations Ltd | Construction | 2024 |
| East Devon IT Limited | Information & communication | 2004 |
| Easterbrook Eaton Limited | Professional & scientific | 2002 |
| Easy Peasy School of Motoring Ltd | Education | 2024 |
| EBB Tides Seaweeds Limited | Agriculture & fishing | 2017 |
| EDM Property Holdings Ltd | Real estate | 2025 |