| Dawn Court Bexhill Management Company Limited | Extraterritorial | 2002 |
| Dawnmead Freehold Company Limited | Households | 2000 |
| Day to Day Convenience Store Ltd | Wholesale & retail | 2026 |
| Day's Properties (Sussex) Limited | Real estate | 2000 |
| DE LA Kitchen Ltd | Hospitality | 2025 |
| DE LA Warr Investments Limited | Real estate | 2016 |
| DE LA Warr Limited | Construction | 2023 |
| Dear Future CIC | Arts & recreation | 2023 |
| Debt Waiver Limited | Other services | 2011 |
| Decibel-Pr Ltd | Professional & scientific | 2025 |
| Deliciously Inspired Limited | Administrative & support | 2014 |
| Delphi Publishing Limited | Information & communication | 2015 |
| Denbigh Court (Bexhill) Management Company Limited | Households | 1966 |
| Denebank Properties Limited | Households | 1989 |
| Denis Parkinson Carpets & Furniture Limited | Wholesale & retail | 2019 |
| Denton Consultancy Services Limited | Professional & scientific | 2016 |
| Destination Discoveries Ltd | Information & communication | 2021 |
| Development Participations Limited | Real estate | 2015 |
| Devonshire Bexhill Limited | Real estate | 2015 |
| Devonshire Estates Limited | Other services | 2010 |
| DGC (Historic Buildings) Consultants Limited | Professional & scientific | 2007 |
| DGT Partnerships Ltd | Professional & scientific | 2024 |
| DH Pools Ltd | Construction | 2026 |
| Diamond Drilling (UK) Limited | Construction | 2005 |
| Diamond Paste & Mould Co Limited | Manufacturing | 2011 |
| Digilicious Creatives Limited | Real estate | 2019 |
| Digital Heat Ltd | Professional & scientific | 2021 |
| Directequip Limited | Wholesale & retail | 2005 |
| Discover Animals Limited | Information & communication | 2021 |
| DJF Group Ltd | Financial services | 2023 |
| DKS SET Decoration Ltd | Professional & scientific | 2021 |
| DLR Solutions Ltd | Construction | 2025 |
| DMS Reinstatement Ltd | Construction | 2025 |
| DNA Hospitality and Catering Services Limited | Hospitality | 2023 |
| Dolan Healthcare Ltd | Health & social care | 2023 |
| Dolce Vita (Bexhill) Limited | Hospitality | 2025 |
| Doleham Close Holdings Limited | Households | 2020 |
| Dorchester Court Limited | Real estate | 2009 |
| DP Plumbing & Heating Solutions Ltd | Construction | 2026 |
| DR EVA Medical Aesthetics Ltd | Other services | 2021 |
| Drain Call Limited | Wholesale & retail | 1981 |
| Drains South East Limited | Water & waste | 2019 |
| DS Security Solutions Ltd | Administrative & support | 2024 |
| DTM Consulting Services Limited | Professional & scientific | 2022 |
| Ductwork by Design Trustee Company Ltd | Financial services | 2025 |
| Dyer & Co Construction Ltd | Construction | 2023 |
| Dyer Property Ltd | Real estate | 2018 |
| Dyer Technology Ltd | Information & communication | 2014 |
| Dyslexia South East CIC | Education | 2025 |
| E Toys World Ltd | Wholesale & retail | 2023 |
| E.Fletcher(Builders)Cannock Limited | Professional & scientific | 1963 |
| E.Fletcher(Stoke)Limited | Professional & scientific | 1956 |
| E.H Builders Ltd | Construction | 2020 |
| E.S.L Marquee Hire Ltd | Hospitality | 2018 |
| E.S.S.P.A. Limited | Extraterritorial | 1997 |
| Eames Services Ltd | Health & social care | 2010 |
| Earthbasket Ltd | Wholesale & retail | 2025 |
| East Sussex Plumbing & Heating (South East) Limited | Construction | 2017 |
| East Sussex School of Performing Arts Limited | Wholesale & retail | 1998 |
| East View Housing Management Limited | Hospitality | 1998 |
| Eastern Beach Leisure Ltd | Hospitality | 2015 |
| Easy & Best Limited | Real estate | 1982 |
| Ebike Repairs UK Limited | Manufacturing | 2025 |
| Eclatz Ltd | Wholesale & retail | 2024 |
| Eco NOW Design & Build Limited | Construction | 2011 |
| Edenic Gardening Ltd | Professional & scientific | 2023 |
| Edmonds Developments Limited | Construction | 2017 |
| Edward Blakeley Music Ltd | Information & communication | 2022 |
| Ejuiceology Limited | Wholesale & retail | 2017 |
| Elda IT Consultancy Ltd | Information & communication | 2019 |
| Electro Classics Limited | Manufacturing | 2020 |
| Elise Garnham Ltd | Wholesale & retail | 2024 |
| Elite Holdings and Developments Limited | Construction | 2021 |
| Elizabeth Court Management Company Limited | Households | 1993 |
| Elizabeth Court Rest Home Limited | Health & social care | 2005 |
| Ellasj Ltd | Other services | 2025 |
| Ellie Hilton Domm Ltd | Professional & scientific | 2018 |
| Ellis & Associates Ltd | Administrative & support | 2012 |
| Elliston Homes Limited | Real estate | 1977 |
| Ellittetech Ltd | Information & communication | 2025 |
| Ellman Property Company Limited | Real estate | 2003 |
| ELM Diabetes Training Ltd | Education | 2024 |
| Elusive Music Ltd | Information & communication | 2021 |
| Elysian Crates Limited | Information & communication | 2026 |
| Embassy Leisure Corporation Ltd | Hospitality | 2016 |
| EMD Talent Limited | Information & communication | 2008 |
| Emil and Berta Ltd | Wholesale & retail | 2021 |
| Emma Hellier Limited | Other services | 2013 |
| Emma Jamison Ltd | Administrative & support | 2024 |
| Emmerson Plastering Limited | Construction | 2022 |
| Emmy's App Limited | Information & communication | 2026 |
| Empooower Ltd | Administrative & support | 2026 |
| Emswells Ltd | Arts & recreation | 2023 |
| Energywise Electrical S.E. Limited | Construction | 2015 |
| ENRIK19 Talltrees. Limited | Households | 2020 |
| Epic Life Sussex Ltd | Arts & recreation | 2020 |
| Escholar Education Group Ltd | Education | 2023 |
| ESK Developments Limited | Wholesale & retail | 2016 |
| Essential Property Maintenance Limited | Administrative & support | 2021 |
| Etechd Ltd | Information & communication | 2018 |