| Courtney-Thorne Ltd | Manufacturing | 2001 |
| Cove Calligraphy Ltd | Manufacturing | 2016 |
| Coyson Marlin Limited | Administrative & support | 2012 |
| Craft Home Group Ltd | Wholesale & retail | 2024 |
| Craft House Chocolate Ltd | Manufacturing | 2021 |
| Creative Shortcut Ltd | Information & communication | 2025 |
| Crew Roofing Ltd | Construction | 2021 |
| Croydon Education Limited | Education | 2011 |
| CS Holdco Ltd | Households | 2023 |
| CSY Enterprise Ltd | Wholesale & retail | 2020 |
| CV Management Ltd | Wholesale & retail | 2019 |
| Cyclepaths Ltd | Wholesale & retail | 2013 |
| Cynosure Cars LLP | | 2019 |
| Cynosure Estates Ltd | Households | 2020 |
| Cynosure Partners Ltd | Water & waste | 2018 |
| D Clarke Holdings Ltd | Administrative & support | 2024 |
| D Dowdell Ltd | Professional & scientific | 2022 |
| D G Yeatman Surveying & Engineering Limited | Construction | 2003 |
| D Hiller Associates Limited | Administrative & support | 2007 |
| D Turner Plumbing & Heating Ltd | Construction | 2024 |
| D. Brewer Limited | Construction | 1965 |
| D. Muspratt Developments Ltd | Construction | 2018 |
| Dark Light Advisory Ltd | Professional & scientific | 2025 |
| Dave Marsh Glass & Glazing Ltd | Construction | 2018 |
| David Richards Practice Limited | Professional & scientific | 2013 |
| David Ridley Consultancy Limited | Professional & scientific | 2010 |
| Davidson & Gill Executive Coaching Ltd | Education | 2023 |
| Davies Pointing Services Ltd | Construction | 2018 |
| Dawood Enterprises Limited | Professional & scientific | 2019 |
| DBW Brickwork Limited | Construction | 2009 |
| DBW Clay Company Limited | Arts & recreation | 2004 |
| DDC Garden Machinery Ltd | Other services | 2022 |
| Deadly Byte Limited | Information & communication | 2011 |
| Decision Mechanics Limited | Information & communication | 1998 |
| Delight Approach Ltd | Hospitality | 2026 |
| Deploy IT NOW Limited | Information & communication | 2019 |
| Derek J Rolls Estate Agents Ltd | Real estate | 2024 |
| Derivsupport Services Ltd | Professional & scientific | 2009 |
| Design & Build Group Building Surveyors Ltd | Professional & scientific | 2024 |
| Devco 777 Limited | Construction | 2018 |
| Diamond Improvements Ltd | Construction | 2008 |
| Dice Heads Ltd | Arts & recreation | 2020 |
| Direct Recycling Centre Limited | Real estate | 2016 |
| DKF Procurement Solutions Ltd | Professional & scientific | 2018 |
| DNC Electrical Services Ltd | Construction | 2016 |
| Dorchester Concrete and Screed Limited | Extraterritorial | 2014 |
| Dorset & Hampshire Roofing Specialists Ltd | Construction | 2025 |
| Dorset Business Consultants Ltd | Professional & scientific | 2013 |
| Dorset Child Health, Neurology and Epilepsy Care Ltd | Health & social care | 2019 |
| Dorset Filters Limited | Extraterritorial | 2011 |
| Dorset Kent Ltd | Real estate | 2015 |
| Dorset Kitchens Limited | Manufacturing | 2006 |
| Dorset Lift (Installations) Limited | Extraterritorial | 2009 |
| Dorset Lift (Services) Limited | Construction | 2009 |
| Dorset Lifts Limited | Construction | 1999 |
| Dorset One Ltd | Real estate | 2024 |
| Dorset Platform Lifts Limited | Construction | 2006 |
| Dorset Reclamation Limited | Administrative & support | 1996 |
| Dorset Spray Plastering and Painting Contractors Ltd | Construction | 2025 |
| Dorset Stoves Ltd | Wholesale & retail | 2024 |
| DR Krystina Limited | Health & social care | 2021 |
| DS Land (South) Limited | Construction | 2014 |
| DS Pets Ltd | Other services | 2024 |
| DSF Companies Limited | Arts & recreation | 2026 |
| Dunn IT PMO Consultancy Ltd | Professional & scientific | 2019 |
| Durant Security Limited | Administrative & support | 2011 |
| E Cheshankova Ltd | Health & social care | 2010 |
| E&L Investments Ltd | Real estate | 2018 |
| Eagle Electrical Contractors Limited | Construction | 1980 |
| Earsmiths Acoustics Ltd | Extraterritorial | 2025 |
| Earsmiths Consultants Ltd | Professional & scientific | 2025 |
| Earthbond Limited | Administrative & support | 2008 |
| EB 38CHAR Ltd | Real estate | 2025 |
| Eco Energy Care Ltd | Professional & scientific | 2022 |
| Eco Lift Solutions Ltd | Extraterritorial | 2015 |
| Elem Consultancy Ltd | Information & communication | 2025 |
| Elite Construction & Landscapes Ltd | Administrative & support | 2023 |
| Elliott Construction (Dorset) Limited | Construction | 2007 |
| Endless Horizons Limited | Professional & scientific | 2019 |
| Enovator Ltd | Administrative & support | 2023 |
| Entoyment Ltd | Wholesale & retail | 2014 |
| Ergo SUM Limited | Information & communication | 1999 |
| Ericsson Automobile Holdings Limited | Financial services | 2018 |
| Ernest Consultancy Ltd | Professional & scientific | 2026 |
| Ethos Creative Marketing Ltd | Information & communication | 2012 |
| Evans Utilities Limited | Construction | 2019 |
| Everbodi Limited | Information & communication | 2023 |
| Evorio Group Holdings Limited | Financial services | 2024 |
| Executive Assist Ltd | Information & communication | 2004 |
| F C F Properties Ltd | Real estate | 2016 |
| F&H Investments Ltd | Real estate | 2019 |
| Fade Media Limited | Information & communication | 2016 |
| Farenci Ltd | Extraterritorial | 2024 |
| Fayrewood Doors Ltd | Wholesale & retail | 2023 |
| Femme Getaway Ltd | Administrative & support | 2025 |
| Fieldgate (Chesham) Limited | Real estate | 1991 |
| Fieldgate Estates Limited | Real estate | 1994 |
| Fieldgate Millennium Limited | Real estate | 2000 |
| Filomena Marketing Ltd | Administrative & support | 2025 |
| First Choice Motor Engineers Limited | Wholesale & retail | 1999 |