| Castle and Barry Construction Limited | Construction | 2022 |
| Castlemead Washford Management Limited | Households | 2017 |
| CGH Lets Ltd | Real estate | 2026 |
| Chai D’Lish Limited | Hospitality | 2025 |
| Channel Adventure C.I.C. | Arts & recreation | 2014 |
| Channel Architecture Ltd | Professional & scientific | 2022 |
| Channel Developments (Minehead) Ltd | Construction | 2014 |
| Channel Property Management Ltd | Hospitality | 2009 |
| Channel Training Limited | Education | 2011 |
| Channel UK Events CIC | Arts & recreation | 2018 |
| Chapel Cleeve Manor Ltd | Hospitality | 2022 |
| Chapmans Shoes Ltd | Wholesale & retail | 2013 |
| Chapter Auto Group Ltd | Wholesale & retail | 2026 |
| Charles Sweetland & Sons Limited | Construction | 1960 |
| Chisman Russell Limited | Real estate | 2021 |
| Cleveland House Management Co. Limited | Households | 1992 |
| Clevelands Freehold Company Ltd | Households | 2008 |
| Climateaction.Tech CIC | Other services | 2023 |
| Clinida Care Limited | Construction | 1983 |
| CMC Controls Limited | Manufacturing | 2022 |
| Coastal and Country Pubs Ltd | Hospitality | 2025 |
| Coastal Property Services (Minehead) Ltd | Administrative & support | 2026 |
| Cold & Flue Limited | Construction | 2017 |
| Colour Centre Minehead Ltd | Wholesale & retail | 2019 |
| Combe Technologies Ltd | Agriculture & fishing | 2022 |
| Comprehensive Renovation Ltd | Construction | 2025 |
| Content 4 Limited | Health & social care | 2002 |
| Cornerstone Design & Projects Limited | Administrative & support | 2007 |
| Cottrells Hospitality Limited | Hospitality | 2011 |
| Courtyard Framing Limited | Wholesale & retail | 2010 |
| Cricket Landscaping Limited | Administrative & support | 2008 |
| Cridland Real Estate Ltd | Construction | 2025 |
| Croco Foods Ltd | Hospitality | 2025 |
| Cross Flats Limited | Households | 1988 |
| Croydon Cottage Limited | Hospitality | 2025 |
| Croydon Hall Limited | Hospitality | 2023 |
| Croydon Hall Management Limited | Hospitality | 2010 |
| Croydon House Management Limited | Hospitality | 2023 |
| Croydon Lodge Limited | Hospitality | 2025 |
| Curtains & Blinds Direct Limited | Wholesale & retail | 2003 |
| Cutlers Flowers Ltd | Wholesale & retail | 2019 |
| D & E Property Investments Ltd | Real estate | 2024 |
| D a a Halsgrove Limited | Information & communication | 2001 |
| D and E Properties and Investments Limited | Households | 2024 |
| DAN Bowley Plumbing and Heating Ltd | Construction | 2024 |
| DAN Stone Accountancy Ltd | Professional & scientific | 2021 |
| Dana's Takeaway Ltd | Hospitality | 2015 |
| Daniel Currie Limited | Professional & scientific | 2007 |
| David Naill & Co Limited | Manufacturing | 2003 |
| DC Contract Cleaning Limited | Administrative & support | 2024 |
| Delineate Capital Ltd | Financial services | 2026 |
| Demora Associates Ltd | Information & communication | 2002 |
| Dentaz Ltd | Health & social care | 2012 |
| Derek Merson Limited | Wholesale & retail | 2000 |
| Devon and Somerset Deer Management Ltd | Wholesale & retail | 2026 |
| Dinmore Manor Locomotive Limited | Administrative & support | 1995 |
| Dirtbikexpress Ltd | Wholesale & retail | 2006 |
| DK Kidd Ltd | Information & communication | 2019 |
| Dklos Associates Ltd | Professional & scientific | 2026 |
| DLR Projects Ltd | Construction | 2024 |
| Dobbin Films Ltd | Information & communication | 2020 |
| Dollheads Salon Limited | Other services | 2015 |
| Dolobran Porlock Management Limited | Hospitality | 1989 |
| Dorrill Accountancy Ltd | Professional & scientific | 2021 |
| DP Autoworks Limited | Wholesale & retail | 2016 |
| DPA Holdings Limited | Financial services | 2024 |
| Dunkery Health Limited | Health & social care | 2015 |
| Dunkery Services Limited | Manufacturing | 2003 |
| Dunster Beach Holidays Limited | Hospitality | 1965 |
| Dunster Castle Hotel Ltd | Hospitality | 2016 |
| Dunster Country Stores Ltd | Wholesale & retail | 2017 |
| Dunster Events Limited | Hospitality | 2025 |
| Dunster Fine Food and Drinks Ltd | Wholesale & retail | 2021 |
| Dunster Lodge Holdings Limited | Financial services | 2021 |
| Dunster Lodge in the Community Limited | Health & social care | 2012 |
| Dunster Lodge Limited | Health & social care | 2015 |
| Dunster Winter Festival C.I.C. | Arts & recreation | 2024 |
| E&C Hospitality Ltd | Hospitality | 2021 |
| Eagle Evolution Ltd | Arts & recreation | 2016 |
| Earlplan Property Management Company Limited | Hospitality | 1990 |
| Eazy Enterprises Ltd | Wholesale & retail | 2022 |
| EC & LK Parker Limited | Agriculture & fishing | 2003 |
| Edgcott House Limited | Hospitality | 2008 |
| EJ & GA Hooper Ltd | Wholesale & retail | 2016 |
| Embers Woodburners Limited | Wholesale & retail | 2023 |
| Enchantment Productions Limited | Arts & recreation | 2026 |
| Enjoyable Entertainments Ltd | Arts & recreation | 2023 |
| Envy Websites Ltd | Information & communication | 2013 |
| Equi-Living Ltd | Real estate | 2020 |
| Erithacus Ltd | Construction | 2019 |
| ESH Metal Recycling Ltd | Wholesale & retail | 2022 |
| Esplanade (NO.2) Management (Minehead) Limited | Households | 1976 |
| EXE Fire Safety Ltd | Professional & scientific | 2008 |
| Exford Service Station Limited | Wholesale & retail | 2017 |
| Exmoor Adventures Ltd | Arts & recreation | 2015 |
| Exmoor Automation Limited | Professional & scientific | 2015 |
| Exmoor Character Cottages Limited | Hospitality | 2018 |
| Exmoor Community Care Ltd | Health & social care | 2025 |
| Exmoor Food and Crafts Limited | Wholesale & retail | 2021 |
| Exmoor Forest Inn Limited | Hospitality | 2021 |