| D&R Electrical Services Ltd | Construction | 2018 |
| D&R Retail Ltd | Wholesale & retail | 2024 |
| D. D. Motors Limited | Administrative & support | 2011 |
| D. Medlock Consulting Limited | Professional & scientific | 2012 |
| D.B.A. Self Service Garage Ltd | Wholesale & retail | 2022 |
| D.M.P Brickwork Ltd | Construction | 2024 |
| D.Underwood Window Cleaning Ltd | Administrative & support | 2025 |
| Dabitec Limited | Extraterritorial | 2009 |
| Daffodil Gardens (Arundel Road) Residents Management Company Limited | Households | 2024 |
| Dagg Developments Ltd | Arts & recreation | 1999 |
| DAH Electrical & Security Limited | Construction | 2011 |
| DAL Associates Limited | Professional & scientific | 2016 |
| Dalu Haulage Ltd | Transport & logistics | 2019 |
| Damien Enticott Ltd | Other services | 2019 |
| DAN the Tyre MAN Limited | Wholesale & retail | 2020 |
| Dana Kitchen Ltd | Hospitality | 2025 |
| Danaglade Developments Limited | Construction | 1983 |
| Daniel Grama Limited | Construction | 2024 |
| Danni Clark Beauty Ltd | Other services | 2025 |
| Danni Clark Laser Ltd | Other services | 2025 |
| Danros Financial Services Ltd | Financial services | 2025 |
| Dantc Trading Co. Ltd | Wholesale & retail | 2012 |
| Danyah Miller Storyteller Ltd | Arts & recreation | 1976 |
| Daphne Sail Ltd. | Extraterritorial | 2025 |
| Daren Sheppard Limited | Construction | 2007 |
| DARI2013 Ltd | Transport & logistics | 2018 |
| Darmar Limited | Real estate | 2023 |
| Darren Hall Property Services Ltd | Construction | 2017 |
| Darren Longhurst Ltd | Construction | 2012 |
| Darren Miles Funeral Service Limited | Other services | 2010 |
| Darren Wright Properties Maintenance Limited | Administrative & support | 2019 |
| Dart Motorrad Engineering Ltd | Wholesale & retail | 2023 |
| Data Creative AI Limited | Administrative & support | 2010 |
| DAU Components Limited | Manufacturing | 1977 |
| Daunt Travel Limited | Administrative & support | 2009 |
| Dave Boltwood Technology Limited | Information & communication | 2024 |
| Dave Bright Training Limited | Professional & scientific | 2009 |
| Dave Hart Acting Limited | Administrative & support | 2024 |
| David March Developments Limited | Construction | 2004 |
| Davlia Properties Limited | Real estate | 2024 |
| Dawlaw Limited | Real estate | 2012 |
| DB Landscape Management Ltd | Administrative & support | 2022 |
| Dbmm Limited | Professional & scientific | 2019 |
| DBP Trad Ltd | Wholesale & retail | 2025 |
| DD Elite Investments Ltd | Real estate | 2024 |
| Dean Coppard Carpentry Ltd | Construction | 2011 |
| Deane Court Residents Association Limited | Households | 1996 |
| Dedicated by Design Ltd | Education | 2023 |
| Dedicated Physiques Ltd | Arts & recreation | 2025 |
| Delaney BED & Breakfast Limited | Hospitality | 2018 |
| Delaney Plumbing Limited | Real estate | 2016 |
| Delicious Ann's Cafe Ltd | Hospitality | 2023 |
| Delicious Smash Ltd | Hospitality | 2025 |
| Deligo Butchery Ltd | Wholesale & retail | 2026 |
| Deligo Eatery Bognor Regis Ltd | Hospitality | 2019 |
| Dellicott Services Ltd | Professional & scientific | 2023 |
| Delta E-Epcs Limited | Administrative & support | 2007 |
| Demolition Spotlight Ltd | Extraterritorial | 2025 |
| Denley Associates Limited | Professional & scientific | 2006 |
| Denmarsh Carpentry Limited | Construction | 2017 |
| Denno's Ltd | Wholesale & retail | 2024 |
| Denyan Constructions Limited | Construction | 2026 |
| Derek Baker Sports Ltd | Arts & recreation | 2026 |
| Derry & Michel Burn Services Limited | Administrative & support | 2014 |
| Desertpool Limited | Construction | 2001 |
| Detailed Developments and Construction Limited | Construction | 2023 |
| Detecnicks (Property) Ltd | Real estate | 1999 |
| Detecnicks Ltd | Wholesale & retail | 1999 |
| Determined Solutions Ltd | Professional & scientific | 2022 |
| Devonshire Place (Tenants Association) Limited | Households | 1979 |
| Dew-Able Ltd | Administrative & support | 2024 |
| Dewick and SON Limited | Construction | 1989 |
| Dexe Media Ltd | Information & communication | 2025 |
| Dial Square Developments Ltd | Real estate | 2020 |
| Diatest UK Metrology Limited | Administrative & support | 2023 |
| Dibles Road (Fareham) Management Ltd | Households | 2012 |
| Dimageo Limited | Transport & logistics | 2023 |
| DIMITROV008 Ltd | Construction | 2021 |
| Dinkerella Ltd | Agriculture & fishing | 2026 |
| Dinu Pass Productions Limited | Information & communication | 2015 |
| Dinwiddy Consulting Limited | Public administration | 2023 |
| Direct Assets Limited | Wholesale & retail | 2018 |
| Disruptive by Nature Ltd | Wholesale & retail | 2021 |
| Distinctio Limited | Professional & scientific | 2024 |
| Distinctio Living Limited | Real estate | 2025 |
| DJ Lategan Limited | Information & communication | 2019 |
| DJB Cloud Consulting Ltd | Wholesale & retail | 2018 |
| Djerba Cafe Limited | Hospitality | 2025 |
| DJF Property Ltd | Real estate | 2026 |
| DJF Southern Ltd | Construction | 2018 |
| DJM Property Services Ltd. | Administrative & support | 2016 |
| DJR Property & Management Limited | Households | 2025 |
| DJW Consultancy Ltd | Professional & scientific | 2019 |
| DK Removals & Clearance Limited | Transport & logistics | 2020 |
| DKS Advisory Limited | Administrative & support | 2025 |
| DL Air Mechanical Limited | Construction | 2023 |
| Dlight Express Ltd | Wholesale & retail | 2019 |
| Dls:Arch Limited | Professional & scientific | 2020 |
| DMB Property Services (Sussex) Ltd | Construction | 2025 |
| DMC Electronic Security Systems Ltd | Administrative & support | 2018 |