| Dorset Ginger Drinks Ltd | Manufacturing | 2023 |
| Dorset Green Energy Ltd | Construction | 2023 |
| Dorset Group Ltd | Construction | 2025 |
| Dorset Home Care Providers Association Limited | Administrative & support | 2009 |
| Dorset Home Solutions Ltd | Manufacturing | 2025 |
| Dorset Homes Limited | Construction | 2010 |
| Dorset Indians CIC | Arts & recreation | 2022 |
| Dorset Joinery Limited | Manufacturing | 2005 |
| Dorset Lake Shipyard Limited | Transport & logistics | 1937 |
| Dorset Legal Services Ltd | Professional & scientific | 2020 |
| Dorset Legionella Ltd | Water & waste | 2025 |
| Dorset Liquid Screed Ltd | Construction | 2024 |
| Dorset Luxury CARS(2014) Limited | Transport & logistics | 2014 |
| Dorset Maker Studio Ltd | Professional & scientific | 2026 |
| Dorset Neurology Limited | Health & social care | 2019 |
| Dorset Occupational Health Ltd | Extraterritorial | 2014 |
| Dorset Office Furniture (2004) Limited | Wholesale & retail | 2004 |
| Dorset Packaging Ltd | Wholesale & retail | 2024 |
| Dorset Pathways Ltd | Education | 2022 |
| Dorset Planters Ltd | Agriculture & fishing | 2019 |
| Dorset Plumbing & GAS Ltd | Construction | 2019 |
| Dorset Plumbing Ltd | Construction | 2022 |
| Dorset Power Flush Limited | Construction | 2008 |
| Dorset Private Medical Clinic LLP | | 2014 |
| Dorset Pro Painting Ltd | Construction | 2021 |
| Dorset Probate & Property Clearance Ltd | Water & waste | 2026 |
| Dorset Property Holdings Ltd | Real estate | 2025 |
| Dorset Property Improvements Ltd | Construction | 2022 |
| Dorset Property Investments Limited | Real estate | 2020 |
| Dorset Property LAB Limited | Real estate | 2017 |
| Dorset Quality Cars Ltd | Wholesale & retail | 2025 |
| Dorset Radiology Limited | Health & social care | 2016 |
| Dorset Render Pro Limited | Construction | 2018 |
| Dorset Respiratory Limited | Health & social care | 2020 |
| Dorset Roofing & Building Limited | Construction | 2024 |
| Dorset Saunas Ltd | Manufacturing | 2022 |
| Dorset Scaffolding and Roofing Services Ltd | Construction | 2021 |
| Dorset Scaffolding Services Limited | Construction | 2025 |
| Dorset Scaffolding Specialist Ltd | Construction | 2025 |
| Dorset Scrapstore | Water & waste | 1999 |
| Dorset Shellfish Company (Poole) Ltd | Agriculture & fishing | 2018 |
| Dorset Snacks Ltd | Hospitality | 2023 |
| Dorset Solar PV Limited | Construction | 2024 |
| Dorset Stairs Ltd | Manufacturing | 2018 |
| Dorset Stove Installations Ltd | Construction | 2015 |
| Dorset Surgery Limited | Health & social care | 2019 |
| Dorset Swim School LLP | | 2012 |
| Dorset Therapy Limited | Health & social care | 2014 |
| Dorset Thermal Contracting Ltd | Construction | 2016 |
| Dorset Trade Windows (South West) Ltd | Construction | 2018 |
| Dorset Transport Service Limited | Transport & logistics | 2024 |
| Dorset Vehicle Transport Ltd | Transport & logistics | 2022 |
| Dorset Volksfest Limited | Arts & recreation | 2013 |
| Dorset Web Limited | Extraterritorial | 2001 |
| Dorset Wood Floors Ltd | Construction | 2026 |
| Dorset Woodburner Centre Limited | Wholesale & retail | 2014 |
| Dorset Woodcraft Ltd | Manufacturing | 2025 |
| Dorset Yacht Co. Limited | Transport & logistics | 1967 |
| Dorsetpropertycare Ltd | Administrative & support | 2023 |
| Dorsets Cleaning Services Ltd | Administrative & support | 2021 |
| Doru Hair Art Ltd | Other services | 2023 |
| Doruk SEO Services Limited | Professional & scientific | 2020 |
| DOS Nomadas Limited | Information & communication | 2019 |
| Dosabase Ltd | Information & communication | 2019 |
| DOT 11 Media Limited | Information & communication | 2015 |
| DOT Creates Ltd | Professional & scientific | 2025 |
| DOT Earth Ltd | Professional & scientific | 2019 |
| DOT Edibles Ltd | Manufacturing | 2025 |
| Dotchat Ltd | Information & communication | 2023 |
| Doted EYS Limited | Education | 2023 |
| Dott Telekom Ltd | Information & communication | 2021 |
| Dotties Driveways and Landscaping Ltd | Administrative & support | 2025 |
| Doubi Consulting Ltd | Information & communication | 2024 |
| Double Index Limited | Administrative & support | 2021 |
| Double LZ Ltd | Wholesale & retail | 2025 |
| Double M Digital Ltd | Information & communication | 2016 |
| Double U Southern Ltd | Financial services | 2016 |
| Doubletech Solutions Ltd | Wholesale & retail | 2020 |
| Doug Womack Ltd | Information & communication | 2018 |
| Dough Dorks Ltd | Hospitality | 2025 |
| Doughnut Economics Action LAB C.I.C. | Professional & scientific | 2019 |
| Doughvelopment Ltd | Information & communication | 2023 |
| Dove Dune Limited | Extraterritorial | 2016 |
| Dovecal Holdings Ltd | Professional & scientific | 2023 |
| Dovetail Doors Ltd | Manufacturing | 2011 |
| Doveyes Consultancy Ltd | Professional & scientific | 2023 |
| Down in the Woods PRE - School Limited | Education | 2004 |
| Downhole Tools International Limited | Mining & quarrying | 2009 |
| Downton Engineering Limited | Wholesale & retail | 1978 |
| Downton Property Freehold Transfer Ltd | Real estate | 2014 |
| Downtown Mini Market Ltd | Wholesale & retail | 2025 |
| Downwind Ltd | Wholesale & retail | 2025 |
| Downy Court RTM Company Limited | Households | 2023 |
| DP Building Construction Ltd | Construction | 2020 |
| DP Managed Services Ltd | Professional & scientific | 2016 |
| DP Servicing Limited | Administrative & support | 2024 |
| DPB Construction Ltd | Construction | 2023 |
| Dpcross Ltd | Hospitality | 2026 |
| DPF Property Services Ltd | Construction | 2025 |
| DPR Estates Limited | Real estate | 2020 |