| Cougar Coatings Limited | Construction | 2006 |
| Court Farm Holiday Bungalows Limited | Hospitality | 2007 |
| Court Print Supplies & Services Limited | Manufacturing | 2002 |
| COX + COX Limited | Wholesale & retail | 2025 |
| CPF Construction Management Limited | Professional & scientific | 2017 |
| Creative Healthcare Services Limited | Real estate | 1994 |
| Crewkerne Fish Bar Ltd | Hospitality | 2023 |
| Criterion Property Investments Limited | Administrative & support | 2003 |
| Cronite Castings Limited | Manufacturing | 1964 |
| Crown Pet Foods Limited | Manufacturing | 1992 |
| Crystal Towers Ltd | Real estate | 2025 |
| CW Curry Limited | Hospitality | 2026 |
| D J Harper Building Limited | Construction | 2006 |
| D X M Limited | Administrative & support | 1998 |
| D. H. James Limited | Wholesale & retail | 2002 |
| D.A. Developments Limited | Real estate | 2005 |
| D.G.H. Contractors Limited | Construction | 2005 |
| D.H. Creed Limited | Agriculture & fishing | 2002 |
| D.W.Hodges Limited | Agriculture & fishing | 1960 |
| DA Vinci Italian Deli Limited | Hospitality | 2003 |
| Daedalus Alpha Limited | Real estate | 2022 |
| Daido Industrial Bearings Europe Limited | Manufacturing | 1998 |
| Daido Metal Europe Limited | Wholesale & retail | 2006 |
| Danny Wilkins Limited | Information & communication | 2006 |
| Daps (Properties) Limited | Real estate | 2001 |
| Dart Accountancy & Software Limited | Information & communication | 1998 |
| Dash (UK) Limited | Wholesale & retail | 1998 |
| Dash Packing Limited | Extraterritorial | 1999 |
| Dave Criddle Travel Limited | Administrative & support | 2002 |
| Dave Marsh Hardware Limited | Wholesale & retail | 2002 |
| David C Rivett Family Funeral Directors Limited | Other services | 2003 |
| David Nichols Associates Limited | Manufacturing | 2005 |
| David Taylor (Garages) Limited | Wholesale & retail | 1976 |
| David Weller Design Limited | Professional & scientific | 2015 |
| Deane Drive Management (Galmington) Limited | Households | 1979 |
| Deanegate Limited | Administrative & support | 1998 |
| Debatts Rrib Associates Limited | Transport & logistics | 2003 |
| DEE Thai Therapy Ltd | Health & social care | 2022 |
| Delaney Gallay Dynamics Limited | | 1965 |
| Deliveries (South West) Limited | | 1991 |
| Denis & IAN Pearce Limited | Construction | 2005 |
| Dentcare LAB Ltd | Health & social care | 2017 |
| Devizes Living Limited | Real estate | 2025 |
| Devon Holdings Limited | Professional & scientific | 2004 |
| Dezell SFX Ltd | Professional & scientific | 2023 |
| Dhaksayen Ltd | Wholesale & retail | 2021 |
| Diligent Vision Systems Ltd | Administrative & support | 1999 |
| Dinghui International Limited | Financial services | 2021 |
| Dining Room Wedmore Ltd | Hospitality | 2025 |
| Diva (Sherborne) Limited | Agriculture & fishing | 2003 |
| DL Management Limited | Real estate | 2005 |
| Dmlr Investments Limited | Real estate | 2025 |
| Dorset,Somerset and Wilts Investment Society Limited(The) | Financial services | 1894 |
| Doug Hillard Sports Limited | Wholesale & retail | 2002 |
| DR. Publishing Limited | Information & communication | 2001 |
| Draper Biomass Energy Limited | Administrative & support | 2013 |
| Drift Meats Limited | Manufacturing | 2023 |
| Driveright Limited | Information & communication | 2003 |
| Drygas Limited | Professional & scientific | 2006 |
| DST Shop Ltd | Wholesale & retail | 2020 |
| DT Holdings (Bristol) Limited | Financial services | 2018 |
| DTJ Consulting Limited | Professional & scientific | 2006 |
| Ducal Models Limited | Manufacturing | 2007 |
| Durston House Street Residents Association Limited | Real estate | 1981 |
| Dyes Bolt Limited | Information & communication | 2004 |
| Dylan Faber Roofing Limited | Construction | 2002 |
| E L Pryor Limited | Real estate | 2023 |
| E.J. Lazenby Contracts Limited | Construction | 1999 |
| E.White & Son(Taunton)Limited | Other services | 1937 |
| East Midlands Sports Direct Limited | Wholesale & retail | 2002 |
| East Somerset Society of Model and Experimental Engineers | Arts & recreation | 2007 |
| Eastbury Farm Limited | Extraterritorial | 2004 |
| Edeva Solutions Limited | Information & communication | 1999 |
| Edge Sounds Limited | Information & communication | 2016 |
| Edison Sales Limited | Manufacturing | 1985 |
| Elecnew Limited | Construction | 1997 |
| Electech Solutions Ltd | Construction | 2020 |
| Ellingwood Ltd | Professional & scientific | 2007 |
| Elthai Ltd | Hospitality | 2025 |
| Emarty Academy Limited | Education | 2007 |
| Emarty Limited | Arts & recreation | 2007 |
| Emarty Productions Limited | Arts & recreation | 2007 |
| Emarty Shop Limited | Wholesale & retail | 2007 |
| Ember Wing Foods Ltd | Hospitality | 2020 |
| EMD - Opal Limited Partnership | | 2020 |
| Emily Parker Limited | Professional & scientific | 2007 |
| Energywise (Domestic) Limited | Wholesale & retail | 1968 |
| Energywise Building Services (Southern) Limited | Professional & scientific | 1976 |
| Enmore Church of England Primary School | Education | 2011 |
| Envirogen Construction Limited | Construction | 1996 |
| Environmental Aggregates (SW) Limited | Extraterritorial | 2000 |
| Epic Cranes Limited | Manufacturing | 2022 |
| Epicurean Dairy (UK) IP Limited | Administrative & support | 2011 |
| Epicurean Dairy (UK) Limited | Wholesale & retail | 2011 |
| Equiapp Limited | Information & communication | 2006 |
| Equine Blades Direct Limited | Agriculture & fishing | 2003 |
| Esat Barbers Ltd | Administrative & support | 2017 |
| Estrella Accountancy Services Limited | Professional & scientific | 2003 |
| Etherton Education Limited | Education | 2002 |
| Etier Trade Limited | Wholesale & retail | 2021 |