| Divine Management Services Limited | Other services | 2017 |
| Dixon Design and Development Ltd | Construction | 2026 |
| Dizzy Blonde Entertainment Limited | Information & communication | 2024 |
| DJ Lets Limited | Hospitality | 2019 |
| DJC Building Services (South Coast) Limited | Construction | 2007 |
| DJK Services (Sussex) Limited | Real estate | 2006 |
| DJL PUB Company Limited | Financial services | 2012 |
| Djlb Wealth Management Limited | Professional & scientific | 2016 |
| DJM Media Limited | Information & communication | 2023 |
| DJW Carpenter & Building Limited | Construction | 2025 |
| Dkcreativesolutions Ltd | Professional & scientific | 2026 |
| DKG Group Ltd | Wholesale & retail | 2016 |
| Dkim Ltd | Information & communication | 2026 |
| Dkrc Enterprises Limited | Administrative & support | 2024 |
| DLH Groundworks Limited | Construction | 2026 |
| Dlivan Barber Limited | Other services | 2021 |
| DLJ Electrical Southeast Limited | Construction | 2019 |
| DLL Holdings Limited | Real estate | 2021 |
| DLW Electrical Solutions Ltd | Construction | 2019 |
| DM Bishop Investments Ltd | Real estate | 2022 |
| DMB Repairwright Ltd | Construction | 2019 |
| DMC Heating and Plumbing Solutions Ltd | Construction | 2022 |
| DMH Drywall Limited | Construction | 2022 |
| DML Design Limited | Administrative & support | 2011 |
| DML Developments Ltd | Construction | 2026 |
| DML Property Developments Ltd | Real estate | 2026 |
| DMV Fitness Training Company Ltd | Education | 2017 |
| DN Godfrey Holdings Limited | Professional & scientific | 2017 |
| DNA 4 Investments Limited | Real estate | 2025 |
| DNA LDN Ltd | Manufacturing | 2022 |
| DNB Design Ltd | Professional & scientific | 2025 |
| Dnd-Utilities Limited | Construction | 2023 |
| DNG Holdings Limited | Professional & scientific | 2016 |
| DO DO UK Group Ltd | Wholesale & retail | 2018 |
| DOB Ltd | Information & communication | 2012 |
| Dobby's Web Solutions Ltd | Information & communication | 2024 |
| Document IT Limited | Information & communication | 1999 |
| Dodman Designs Limited | Professional & scientific | 2022 |
| Dog and Hair Limited | Wholesale & retail | 2019 |
| Dogbowl Productions Ltd. | Arts & recreation | 2020 |
| Dogfit International Limited | Wholesale & retail | 2020 |
| Doggidaze Ltd | Other services | 2024 |
| Dogsy’S Groom Room Ltd | Other services | 2026 |
| DOJ Consulting Ltd | Administrative & support | 2022 |
| Dolce & Gabbana UK Limited | Wholesale & retail | 1998 |
| Dolce Heaven Ltd | Hospitality | 2022 |
| Dollive Limited | Information & communication | 2024 |
| Dolls House Designs Limited | Wholesale & retail | 2024 |
| Dolly Property Ltd | Real estate | 2024 |
| Dolphin Cleaning (Sussex) Ltd | Administrative & support | 2012 |
| Dolphin Lodge Management Company Limited | Households | 1970 |
| Dolphin Tails Swimming School Limited | Education | 2025 |
| Domaintree Ltd | Information & communication | 2016 |
| Domestic Heating & Electrical Services Ltd | Construction | 2008 |
| Dominick Landscapes Limited | Administrative & support | 2003 |
| Dominion Logistics and Receivables Limited | Transport & logistics | 2025 |
| DONCARE1 UK Limited | Health & social care | 2019 |
| Donchevi Group Ltd | Hospitality | 2022 |
| Donwellyn Ltd | Financial services | 2021 |
| Dopamine Dice Ltd | Wholesale & retail | 2026 |
| Dorians Property Solutions Ltd | Real estate | 2023 |
| Doric Industrial Contracts Limited | Construction | 1992 |
| Doricare Ltd | Administrative & support | 2021 |
| Dorothycare Limited | Health & social care | 2014 |
| Dorset Gardens Management Company Limited | Households | 1981 |
| DOS@ Express Ltd | Hospitality | 2025 |
| DOT49 Ltd | Other services | 2022 |
| Double Glazing Repairs (Sussex) Ltd | Construction | 2014 |
| Double I Food Ltd | Hospitality | 2021 |
| Douglas Avenue Ltd | Households | 2021 |
| Dove Carpentry Limited | Construction | 2015 |
| Dover House Limited | Real estate | 1982 |
| Dovers Green Developments Ltd. | Real estate | 2017 |
| Dovetail Design and Build Limited | Construction | 2016 |
| Dovetail Kitchens and Bathrooms Ltd | Construction | 2014 |
| Dovetail Sussex Ltd | Administrative & support | 2017 |
| Down on Earth Limited | Professional & scientific | 2021 |
| Down to Earth Publications Limited | Information & communication | 2021 |
| Downlands Building Management Services Limited | Professional & scientific | 1997 |
| Downside Motors Limited | Wholesale & retail | 1990 |
| Downside Motors Valeting Ltd | Wholesale & retail | 2018 |
| Downsview Associates Limited | Administrative & support | 2007 |
| Downsview Property Developments Limited | Construction | 2016 |
| Downview Management Company Limited | Households | 2012 |
| Dpdbryan Ltd | Transport & logistics | 2020 |
| DR Amber Ltd | Information & communication | 2025 |
| DR Clara O'Brien Neuropsychology Ltd | Health & social care | 2020 |
| DR Kamilah Limited | Health & social care | 2026 |
| DR Smart Homes Ltd | Construction | 2022 |
| DR26:GROUP Ltd | Wholesale & retail | 2025 |
| Dragon Innovations Limited | Administrative & support | 2007 |
| Dragon Next Door Limited | Professional & scientific | 2021 |
| Drake Electrical Services Ltd | Energy | 2020 |
| Drakefords Removals Limited | Transport & logistics | 2024 |
| Draw-Mate Ltd | Construction | 2017 |
| DRB Mortgage Services Limited | Financial services | 2025 |
| Dream Nests Ltd | Real estate | 2023 |
| Drenched Mini Water Polo Ltd | Arts & recreation | 2016 |
| Drenl Limited | Professional & scientific | 2012 |
| DRH Maintenance Group Ltd | Construction | 2020 |