| DMR Foods Ltd | Wholesale & retail | 2018 |
| DN Direct Limited | Administrative & support | 2016 |
| Dobermanns-In-Need Limited | Professional & scientific | 2001 |
| Document Lifecycle Management Ltd | Professional & scientific | 2017 |
| Does AS SHE Pleases Ltd | Administrative & support | 2019 |
| Dog & Duck Events Ltd | Hospitality | 2024 |
| Dolphin Computer Support Limited | Information & communication | 2023 |
| Dolphin Court Shoreham Ltd | Real estate | 2006 |
| Domaculas Pictures Ltd | Information & communication | 2025 |
| Dommlet Limited | Hospitality | 2018 |
| Donnington Butchers Limited | Administrative & support | 2011 |
| Doodle Design Studio Limited | Professional & scientific | 2018 |
| Dorset & Sussex Developments Limited | Construction | 2004 |
| Double K Composites Ltd | Professional & scientific | 2024 |
| Dove Holistic Dental Centre Limited | Health & social care | 2021 |
| Downland Developments Limited | Construction | 2023 |
| Downview Court (Worthing) Ltd. | Households | 1998 |
| Downview Trust | Education | 2013 |
| Doyen Handling (Hire) Limited | | 1988 |
| DPB Automation Ltd | Professional & scientific | 2013 |
| DPD Associates Asset Ltd | Administrative & support | 2025 |
| DPL Southern Ltd | Financial services | 2025 |
| DR Niall Campbell Limited | Health & social care | 2010 |
| DR Paul Bain Ltd | Health & social care | 2015 |
| Drainage Plus Solutions Ltd | Water & waste | 2022 |
| Drake Property Invest Ltd | Real estate | 2022 |
| Dream (Regis) Ltd | Wholesale & retail | 2025 |
| Dream Flip Ltd | Other services | 2021 |
| Dream Home Improvements (Sussex) Limited | Construction | 2020 |
| Drennan Marine Consultancy Limited | Professional & scientific | 2008 |
| DRG Electrical Services Ltd | Construction | 2025 |
| Driftwood Aesthetics Limited | Wholesale & retail | 2026 |
| Drocusfield Limited | Wholesale & retail | 1964 |
| Drone Services Ltd | Construction | 2026 |
| Drovers Way Management Company Limited | Other services | 2010 |
| DRS Care Limited | Health & social care | 2014 |
| Drywall Tape & Jointers Ltd | Construction | 2020 |
| Du-Bek Estate Limited | Real estate | 2023 |
| Du-Bek Holdings Limited | Financial services | 2016 |
| Duct Cleaning TIP Top Ltd | Administrative & support | 2022 |
| Dukes Court (Chichester) Management Limited | Real estate | 1989 |
| Dynamic Goods Ltd | Wholesale & retail | 2023 |
| Dynamic Renovations Assets Ltd | Real estate | 2026 |
| Dynamic Renovations Sussex Ltd | Construction | 2022 |
| Dynamic Self Ltd | Administrative & support | 2011 |
| E & L Engineering Limited | Construction | 2017 |
| E.L.R Accountancy Limited | Professional & scientific | 2012 |
| Eagle House (Bognor Regis) Residents Association Limited | Households | 1968 |
| Eagle Point Residents Association Limited | Households | 2017 |
| EAP Financial Services Ltd | Financial services | 2017 |
| Easi Electrical and Solar Installations Ltd | Construction | 2024 |
| East Beach Walk Management Company Limited | Households | 2016 |
| East ROW Mews Management Company Limited | Households | 1984 |
| East Sussex Mobile Homes Limited | Administrative & support | 1984 |
| Eastcourt Bridge Limited | Households | 2021 |
| Eastmere Stables Limited | Other services | 2014 |
| Easycourt Developments Limited | Real estate | 2000 |
| Eatspos Digital Services Ltd | Wholesale & retail | 2026 |
| Eazyfit Windows and Doors Ltd | Construction | 2023 |
| Eazylay Carpets Limited | Wholesale & retail | 2021 |
| Ebike South Limited | Manufacturing | 2021 |
| ECG Facades Ltd | Construction | 2019 |
| Eclipse Property (Sussex) Limited | Real estate | 2001 |
| Eco Accounts Ltd | Professional & scientific | 2021 |
| Eco Joinery Solutions Limited | Administrative & support | 2019 |
| Eco-Tender Ltd | Administrative & support | 2021 |
| Ecoheatcool Services Ltd | Construction | 2020 |
| Ecoswap CIC | Wholesale & retail | 2019 |
| Edery Electrical Limited | Manufacturing | 2018 |
| Edery Engineering Ltd | Professional & scientific | 2025 |
| Edios Property Limited | Real estate | 2016 |
| Edivert Limited | Administrative & support | 2014 |
| Edufarming Ltd | Health & social care | 2024 |
| Edwards Site Management Limited | Construction | 2020 |
| EF 21 Limited | Financial services | 2011 |
| EFE3511 Ltd | Hospitality | 2025 |
| EH Sussex Consultants Ltd | Public administration | 2022 |
| EI Portal Ltd | Information & communication | 2026 |
| Eiswagen Limited | Hospitality | 2026 |
| EL Shaddai Trans Ltd | Transport & logistics | 2016 |
| Ela'Vit Ltd | Health & social care | 2026 |
| Eldo Media Limited | Manufacturing | 2008 |
| Electair Connect Limited | Manufacturing | 2011 |
| Electricians to Film Services Limited | Construction | 2018 |
| Element Design Studio Limited | Professional & scientific | 2019 |
| Element Mines Holdings Ltd | Mining & quarrying | 2023 |
| Elevation Food Group Limited | Hospitality | 2026 |
| Elite Auto Services Ltd | Wholesale & retail | 2019 |
| Elite Builders Ltd | Construction | 2018 |
| Elite Driver Hire Ltd | Transport & logistics | 2025 |
| Elizabeth Court (Bognor) Management Company Limited | Households | 2015 |
| Elizabeth Gardens Mgmt Co Limited | Households | 2023 |
| Elizabeth House (Bognor Regis) Limited | Extraterritorial | 1973 |
| Ellatronix Ltd | Information & communication | 2015 |
| ELM and IVY Solutions Ltd | Administrative & support | 2026 |
| ELM Court (Bognor Regis) Limited | Professional & scientific | 2001 |
| Elmer Beach Residents Association Limited | Households | 1966 |
| Elmer Garage Ltd | Wholesale & retail | 2024 |
| Elmer Restaurant Ltd | Hospitality | 2026 |
| Elmer Sands Limited | Households | 1936 |