| Complete Contract Carpenters Limited | Construction | 2014 |
| Complete Couriers Ltd | Transport & logistics | 2018 |
| Composites TR Limited | Manufacturing | 2024 |
| Concorde Risk Services Ltd | Financial services | 2020 |
| Connaught Services Ltd | Professional & scientific | 2006 |
| Connect PC Services Limited | Information & communication | 2007 |
| Connecting Rainbows Limited | Health & social care | 2024 |
| Construction CRM Ltd | Information & communication | 2009 |
| Cool Coffee Cart (LV) Limited | Hospitality | 2022 |
| Cool Coffee Cart (Mobile) Limited | Hospitality | 2022 |
| Coppice Mews (Ashley Heath) Limited | Households | 2024 |
| Coral Homes (Milford) Ltd | Financial services | 2010 |
| Corbin Plasterers Limited | Construction | 2001 |
| Costello Lettings Ltd | Households | 2007 |
| Cosy Investments Ltd | Real estate | 2024 |
| Cosypanels Ltd | Wholesale & retail | 2020 |
| Country Paws Pet Care Ltd | Administrative & support | 2022 |
| Countrywide Roofing & Insulation Ltd | Construction | 2020 |
| County Drain Care Ltd | Water & waste | 2018 |
| Cowshed Ventures Limited | Real estate | 2018 |
| Cozy Stoves Wood Burners Dorset Ltd | Construction | 2024 |
| Cracklewood Limited | Professional & scientific | 2023 |
| Crafted Carpentry Ltd | Other services | 2017 |
| Crafted Plates Ltd | Wholesale & retail | 2022 |
| Creative Home Cinema Ltd | Wholesale & retail | 2007 |
| Creative Rooms Ltd | Professional & scientific | 2025 |
| Creo Projects Ltd | Construction | 2023 |
| Cribbar Point Rentals Limited | Real estate | 2022 |
| CRM Carpentry Limited | Construction | 2024 |
| Crows Meadow Limited | Professional & scientific | 1998 |
| CRS Dorset Ltd | Construction | 2016 |
| Ctfn Group Holdings Ltd | Real estate | 2024 |
| Ctfn Group Ltd | Financial services | 2024 |
| Ctfn Propco 2 Limited | Real estate | 2024 |
| Ctfn Propco Ltd | Real estate | 2016 |
| Cullen Build Limited | Construction | 2023 |
| Cure Lettings Limited | Real estate | 2019 |
| Cure Properties Limited | Real estate | 2019 |
| Curiel Kitchen Designs Ltd | Professional & scientific | 2018 |
| Curious Pheasant Theatre Limited | Arts & recreation | 2017 |
| Cycle and Soften Limited | Other services | 2025 |
| Cypress Risk Ltd | Administrative & support | 2020 |
| D F Fleet Repairs Ltd | Wholesale & retail | 2021 |
| D W Allen Electrical Ltd | Energy | 2014 |
| D&W Hunter Limited | Construction | 2018 |
| D.Yates Building Contractors Ltd | Construction | 2003 |
| D2K Limited | Information & communication | 2026 |
| Dad-Ease Limited | Information & communication | 2017 |
| Daisy Office Supplies Limited T/A Daisy Office Group Ltd | Administrative & support | 2014 |
| Daisy Print Limited | Manufacturing | 2019 |
| Dancing Roosters Limited | Hospitality | 2022 |
| Danian Build Limited | Professional & scientific | 2016 |
| Danian Properties Limited | Real estate | 2016 |
| Dans Best Friend Canine Hydrotherapy Ltd | Professional & scientific | 2018 |
| Darli Homes Limited | Construction | 1979 |
| Darling Group UK Ltd | Arts & recreation | 2024 |
| Darri Healthcare Limited | Health & social care | 2016 |
| Davdan Joinery Ltd | Manufacturing | 2018 |
| Dave Hunter SFX Ltd | Professional & scientific | 2018 |
| David Riley Ltd | Administrative & support | 2015 |
| Davis & Hiscock Limited | Construction | 1969 |
| DB Commercial Ltd | Administrative & support | 2008 |
| Dc-Electrical SW Ltd | Construction | 2024 |
| DDG Dog Breeders Limited | Agriculture & fishing | 2025 |
| Deacon-Smith Holdings Ltd | Financial services | 2024 |
| Delta Structural Ltd | Professional & scientific | 2020 |
| Delton Limited | Financial services | 2022 |
| Delton Power Limited | Construction | 2017 |
| Denise Taylor Professional Nails Ltd | Other services | 2013 |
| Derek MAN Ltd | Professional & scientific | 2019 |
| DESIGN17 Ltd | Professional & scientific | 2025 |
| Designex Systems Ltd | Professional & scientific | 2015 |
| Desire Ventures Ltd | Wholesale & retail | 2025 |
| Developing People NO.1 Limited | Administrative & support | 1998 |
| Development Education in Dorset (Deed) | Education | 1998 |
| DFP Holdings Ltd | Real estate | 2017 |
| Diagnosys Ferndown Limited | Manufacturing | 2010 |
| Diamond Property Solutions Ltd. | Real estate | 2019 |
| Dick Turpin and Co Ltd | Transport & logistics | 2025 |
| Digital Media Advice Limited | Professional & scientific | 2016 |
| Digital Pro Limited | Information & communication | 2001 |
| Dillon - Cawley Consultancy Ltd | Extraterritorial | 2012 |
| Dimi Ltd | Construction | 2017 |
| Direct & Current Electrical Services Ltd | Construction | 2022 |
| Direct Demolition Limited | Construction | 2018 |
| Discount Health Store Limited | Wholesale & retail | 2001 |
| Discovery ICG Limited | Information & communication | 2003 |
| DLP Coffee Ltd | Hospitality | 2021 |
| DM Projects (UK) Limited | Professional & scientific | 2009 |
| DME Window & Door Doctor Ltd | Construction | 2023 |
| DNM Cleaning Ltd | Administrative & support | 2022 |
| DO IT Enterprise Limited | Administrative & support | 2007 |
| Door Trimming Limited | Professional & scientific | 2022 |
| Dorset Comfort Cars Ltd | Transport & logistics | 2020 |
| Dorset Country Homes Limited | Construction | 1996 |
| Dorset Dash Cams Limited | Wholesale & retail | 2024 |
| Dorset Draughting Limited | Administrative & support | 2008 |
| Dorset Electrical Ltd | Construction | 2020 |
| Dorset Executive Cars Ltd | Transport & logistics | 2026 |
| Dorset Heights Construction Ltd | Real estate | 2020 |