| Camelot Marquees Ltd | Administrative & support | 2008 |
| Carey Stores Ltd | Wholesale & retail | 2021 |
| Careys Secret Garden Limited | Manufacturing | 2019 |
| Carford Heating Services Limited | Construction | 2025 |
| Castle Construction & Dampcure Ltd | Construction | 2023 |
| Castlewick Estates Limited | Real estate | 2005 |
| Catherine Crocker Limited | Administrative & support | 2015 |
| Causeway Motors Ltd | Wholesale & retail | 2025 |
| Cawdor Construction Developments Ltd | Real estate | 2014 |
| Cawdor Lettings Limited | Real estate | 2023 |
| CBI Equipment Ltd | Wholesale & retail | 2006 |
| Cellar Door Inns Ltd | Hospitality | 2020 |
| CF Vehicle Services Limited | Wholesale & retail | 2018 |
| Chapman Lily Planning Limited | Professional & scientific | 2015 |
| Charig Carpentry & Building Ltd | Construction | 2025 |
| Charm Content Limited | Information & communication | 2020 |
| Cherry Heaven Limited | Wholesale & retail | 1992 |
| Cherrykreation Ltd | Wholesale & retail | 2025 |
| Chicken Rescue UK CIC | Agriculture & fishing | 2022 |
| Chobham Flowers Limited | Wholesale & retail | 2018 |
| Christie's Beauty Limited | Other services | 2020 |
| Christine H. Webster Limited | Wholesale & retail | 2002 |
| Christmas Partnership Ltd | Professional & scientific | 2021 |
| Church Knowle Rural Learning Ltd | Education | 2024 |
| Citizens Advice in Dorset | Administrative & support | 2008 |
| Climbing Life Ltd | Arts & recreation | 2017 |
| Climbing the Ladder Ltd | Administrative & support | 2020 |
| Close House Management Limited | Households | 1997 |
| CMD Healthcare Limited | Health & social care | 2025 |
| CMD Property Investment Limited | Construction | 2026 |
| CNG Consulting Ltd | Professional & scientific | 2025 |
| Coal Shed Massage Limited | Other services | 2025 |
| Coastal GAS Services Limited | Construction | 2012 |
| Coastal Publishing Limited | Information & communication | 2010 |
| Coastal Surveying Limited | Professional & scientific | 2023 |
| Colonia Property Partners Limited | Real estate | 2008 |
| Complete Digital Consultancy Limited | Information & communication | 2015 |
| Conches Court Freehold Limited | Real estate | 2004 |
| Consider IT Pimped Ltd. | Manufacturing | 2010 |
| Cool-Tec Services Limited | Manufacturing | 1996 |
| Cool-Tec UK Limited | Real estate | 1999 |
| Coombs Auto Repairs Ltd | Construction | 2024 |
| Corbin Construction Ltd | Construction | 2026 |
| Core Services Ltd | Construction | 2017 |
| Corfe Castle Holidays Ltd | Hospitality | 2021 |
| Corfe Valley Outdoor Learning Ltd | Education | 2024 |
| Corfe View Ltd | Real estate | 2018 |
| Cosmian Stars Ltd | Administrative & support | 2017 |
| Cottrell Construction Limited | Administrative & support | 2008 |
| Courtfield Computer Services Limited | Information & communication | 1985 |
| Courtside Associates Limited | Financial services | 2006 |
| Crazy COW Properties Limited | Real estate | 2016 |
| Create at the Cove Limited | Arts & recreation | 2017 |
| Cruse Financial Services Limited | Financial services | 2011 |
| Cruse Will Writing Services Limited | Professional & scientific | 2009 |
| CSE Formwork Ltd | Construction | 2018 |
| Cultural Purbeck Community Interest Company | Education | 2026 |
| Custardware Limited | Extraterritorial | 1993 |
| D.I.J. Ltd | Manufacturing | 2022 |
| D.M.D. Electronic Engineers Limited | Manufacturing | 1964 |
| D.Thomas Steel Services Ltd | Construction | 2021 |
| D2 Group Limited | Professional & scientific | 2016 |
| Daisy Chain Fitness Limited | Arts & recreation | 2011 |
| Daler Limited Liability Partnership | | 2006 |
| Damson Side Ltd | Professional & scientific | 2024 |
| Dando Holdings Ltd | Financial services | 2019 |
| Dando Leisure Limited | Hospitality | 2012 |
| Dando Lettings Ltd | Real estate | 2019 |
| Darglow Engineering Ltd | Professional & scientific | 1992 |
| David Williams Law Ltd | Professional & scientific | 2012 |
| DBL Pubs Ltd | Hospitality | 2025 |
| DC Peach Ltd | Hospitality | 2025 |
| DCS PUB Co Ltd | Hospitality | 2014 |
| Deacy Properties Limited | Real estate | 2016 |
| Delspere Innovation Ltd | Transport & logistics | 2024 |
| Dolphin Brewery Poole Ltd | Manufacturing | 2013 |
| Dorset Aerospace and Steam Limited | Manufacturing | 2021 |
| Dorset Country & Coastal Lettings Limited | Hospitality | 2017 |
| Dorset Creations Ltd | Wholesale & retail | 2023 |
| Dorset Physical Training C.I.C. | Arts & recreation | 2023 |
| Dorset Wellbeing Limited | Health & social care | 2018 |
| Dovetail Structures Ltd | Professional & scientific | 2026 |
| Drayton Court Management Company Limited | Households | 1986 |
| Dream Clean NOW Ltd | Administrative & support | 2024 |
| Drinkcreate Ltd | Hospitality | 2013 |
| Drivault Ltd | Construction | 2024 |
| Drive by Café Ltd | Hospitality | 2025 |
| Drump LLP | | 2022 |
| Dumashie Limited | Professional & scientific | 2001 |
| Dwyer Management Limited | Real estate | 2017 |
| East Creech Camping & Caravan Park Ltd | Hospitality | 2004 |
| East Wall Residents Company Limited | Households | 1978 |
| Eaststreet Associates Ltd | Real estate | 2016 |
| Eaton Stonemasons Limited | Manufacturing | 2001 |
| Echo DM Limited | Professional & scientific | 2025 |
| EJC Plumbing and Heating Limited | Construction | 2026 |
| Eldowas Support Ltd | Health & social care | 2026 |
| Elevate UK Scaffolding Ltd | Construction | 2025 |
| Elhussini Limited | Information & communication | 2025 |
| Elwood Court (Sandford) Management Company Limited | Households | 1997 |