| Dorset Craft Workshops CIC | Education | 2023 |
| Dorset Data and Electrical Ltd | Professional & scientific | 2025 |
| Dorset Directories Ltd | Information & communication | 2015 |
| Dorset Electrical Group Limited | Extraterritorial | 2025 |
| Dorset Embroidery & Printwear Ltd | Administrative & support | 2007 |
| Dorset Energy Assessment Limited | Professional & scientific | 2007 |
| Dorset Enterprise Ltd | Wholesale & retail | 2017 |
| Dorset Estate Planning Ltd | Professional & scientific | 2026 |
| Dorset Event Catering Limited | Hospitality | 2024 |
| Dorset Events Limited | Hospitality | 2014 |
| Dorset Extensions Group Ltd | Construction | 2024 |
| Dorset EYE Ltd | Information & communication | 2020 |
| Dorset Felt Roofing Limited | Construction | 2010 |
| Dorset Fire Doors Ltd | Public administration | 2025 |
| Dorset Fire Engineers Ltd | Professional & scientific | 2009 |
| Dorset Flower Studio Limited | Wholesale & retail | 2022 |
| Dorset Harbour Retreats Limited | Hospitality | 2023 |
| Dorset Health and Safety Limited | Public administration | 2014 |
| Dorset Heritage Ltd | Construction | 2015 |
| Dorset IT Services Ltd | Wholesale & retail | 2007 |
| Dorset Kebab House Ltd | Hospitality | 2025 |
| Dorset Kebab House Weymouth Limited | Hospitality | 2025 |
| Dorset Land and Sea Ltd | Administrative & support | 2015 |
| Dorset Leisure Hospitality Group Ltd | Hospitality | 2025 |
| Dorset Marine Surveys (International) Limited | Professional & scientific | 2004 |
| Dorset Marquee and Events Hire Ltd | Administrative & support | 2023 |
| Dorset Meadows Limited | Hospitality | 2010 |
| Dorset PAT Testing Ltd | Energy | 2020 |
| Dorset Pest Control Limited | Administrative & support | 2010 |
| Dorset Photo Booth & Entertainments Ltd | Arts & recreation | 2015 |
| Dorset Physio Ltd | Health & social care | 2026 |
| Dorset Planning Consultant Limited | Professional & scientific | 2016 |
| Dorset Plates Ltd. | Wholesale & retail | 2002 |
| Dorset Printmakers Ltd | Manufacturing | 2026 |
| Dorset Recovery Group and Motor Services Limited | Wholesale & retail | 2025 |
| Dorset Rendering & Floor Screeding Limited | Construction | 2007 |
| Dorset Schoolwear Ltd | Wholesale & retail | 2019 |
| Dorset Seafood Festivals Limited | Wholesale & retail | 2024 |
| Dorset Seaside Silver Ltd | Manufacturing | 2024 |
| Dorset Shellfish Limited | Wholesale & retail | 2014 |
| Dorset Stoves & Chimneys Limited | Wholesale & retail | 2016 |
| Dorset Tandoori Ltd | Hospitality | 2025 |
| Dorset Trade Skills (SW) Limited | Education | 2018 |
| Dorset Trimming Co. Limited | Households | 1970 |
| Dorset Waste Limited | Water & waste | 2022 |
| Dorset Window Installations and Repairs Ltd | Construction | 2023 |
| Dorset Windows & Fascias LLP | | 2010 |
| Dorset Wood Fired Pizza Ltd | Hospitality | 2015 |
| Dorsetplug Ltd | Wholesale & retail | 2024 |
| Double One Limited | Other services | 2015 |
| Down 2 Earth Limited | Administrative & support | 2002 |
| DPM Store Limited | Wholesale & retail | 2014 |
| DR Vardev Ltd | Health & social care | 2023 |
| DR. Word UK Limited | Professional & scientific | 2022 |
| Dragonfyre Limited | Wholesale & retail | 2025 |
| Drainability Ltd | Water & waste | 2020 |
| Drakidge Ltd | Extraterritorial | 2019 |
| Dreadnought Testing Ltd | Information & communication | 2024 |
| Dream Screen South Limited | Wholesale & retail | 2013 |
| Driftwood Weymouth Ltd | Hospitality | 2021 |
| Dronehive Ltd | Professional & scientific | 2025 |
| Droneme Ltd | Professional & scientific | 2026 |
| Drum Dog Ltd | Information & communication | 2020 |
| DRW Marine Ltd | Manufacturing | 2023 |
| DRY Riser Testing South Ltd | Administrative & support | 2012 |
| Dryden Consulting Limited | Extraterritorial | 2015 |
| DSA Developments Limited | Construction | 2017 |
| Dsjr Limited | Public administration | 2016 |
| DTL Software Consultancy Limited | Information & communication | 2023 |
| DTN Enterprises Limited | Real estate | 2008 |
| Duffett Electrical (Services) Limited | Construction | 2014 |
| Duffett's Ltd | Wholesale & retail | 2024 |
| Dunedin Investments Ltd | Real estate | 2021 |
| Dunnings Automatics Limited | Wholesale & retail | 2007 |
| Dunnings Repair Centre Limited | Wholesale & retail | 2026 |
| Dunscombe Manor Holdings Limited | Financial services | 2022 |
| DUO Barbers & Beauty Limited | Other services | 2010 |
| Duthie-Smith Investments Limited | Real estate | 2022 |
| Duvari Construction Dorset Limited | Construction | 2016 |
| DW Control Systems Ltd | Manufacturing | 2021 |
| DW Estimating Limited | Professional & scientific | 2025 |
| Dynamic Display Limited | Construction | 1998 |
| E R Clift Ltd | Real estate | 2024 |
| E&E Boutique Ltd | Wholesale & retail | 2024 |
| E-Counting Limited | Professional & scientific | 2014 |
| E-Thrifter Vintage Ltd | Wholesale & retail | 2023 |
| E. M. DE Chazal Consulting Limited | Hospitality | 2011 |
| Eadon Close Limited | Real estate | 1965 |
| Eagle Home Improvements Dorset Ltd | Construction | 2021 |
| Eagle Lion Ministries Ltd | Administrative & support | 2016 |
| Eagle Properties & Letting Ltd | Real estate | 2023 |
| Early Entry Ltd | Information & communication | 2025 |
| Eastney Consulting Limited | Professional & scientific | 2026 |
| Easton Technical Services Ltd. | Professional & scientific | 2013 |
| Eastville Stores Limited | Real estate | 2003 |
| Easy Street Cafe Ltd | Hospitality | 2025 |
| Easybridge Limited | Households | 1985 |
| Eats and Drinks Ltd | Wholesale & retail | 2015 |
| Ebike Exchange Limited | Wholesale & retail | 2025 |
| Echo Groove Music Ltd | Information & communication | 2025 |