| Deben Lodge Farms Limited | Agriculture & fishing | 2020 |
| Deimantas Transport Ltd | Transport & logistics | 2024 |
| Dekheila Container Terminals Overseas Limited | Financial services | 2023 |
| Demhani Limited | Hospitality | 2025 |
| Denmar Transport Ltd | Transport & logistics | 2025 |
| Deploy Recruitment Ltd | Administrative & support | 2024 |
| DGD Transport Ltd | Transport & logistics | 2018 |
| Dggr Plant LLP | | 2016 |
| DHW Property Services Limited | Real estate | 2023 |
| Dial a Destination Limited | Administrative & support | 2011 |
| Diamar Transport Ltd | Transport & logistics | 2023 |
| Dijle Ltd | Hospitality | 2021 |
| DILARA2025 Limited | Hospitality | 2025 |
| Direct Cremations Ipswich Ltd | Extraterritorial | 2023 |
| Direct Cremations Suffolk Ltd | Extraterritorial | 2023 |
| DKT Trans Ltd | Transport & logistics | 2018 |
| DLF Hold Co Limited | Financial services | 2024 |
| DM LOG Ltd | Transport & logistics | 2020 |
| DOB Haulage Ltd | Transport & logistics | 2023 |
| Dolan Property Limited | Real estate | 2024 |
| Dolphin Hotel Felixstowe Limited | Hospitality | 2026 |
| Dolphin Stairlifts (East Anglia) Limited | Administrative & support | 2004 |
| Domain Address Limited | Professional & scientific | 2010 |
| Dormant Company Names Limited | Extraterritorial | 2020 |
| Dorsaah Service Ltd | Transport & logistics | 2022 |
| Doucylane Ltd | Construction | 2013 |
| Dragon House Creative Ltd | Arts & recreation | 2026 |
| Dragonfly Neurodiversity Ltd | Health & social care | 2019 |
| Drayton Projects Ltd | Professional & scientific | 2021 |
| Drumport Ltd | Manufacturing | 2011 |
| DS Customs Solutions Ltd | Transport & logistics | 2020 |
| DSG Global Logistics Ltd | Transport & logistics | 2023 |
| Durban Mews Management Company Limited | Households | 2024 |
| Duty Management Services Limited | Other services | 2000 |
| DVV Ltd | Transport & logistics | 2026 |
| DWT111 Limited | Wholesale & retail | 2017 |
| E.A.M. Holdings Limited | Construction | 1936 |
| E.L Walker Construction Ltd | Construction | 2024 |
| E7 Consulting Limited | Professional & scientific | 2024 |
| EAA Stefanos Ltd | Transport & logistics | 2020 |
| East Coast Plumbing & Heating (EA) Ltd | Construction | 2024 |
| East Coast Windfarm Consultancy Ltd | Professional & scientific | 2023 |
| Eastcliff Carpets Limited | Wholesale & retail | 2006 |
| EBB Media Ltd | Wholesale & retail | 2020 |
| Ecodrain Solutions Ltd | Water & waste | 2021 |
| Ecrepairs Ltd | Wholesale & retail | 2024 |
| Edible Felixstowe CIC | Agriculture & fishing | 2024 |
| Edit by EVE Limited | Other services | 2022 |
| Edney Court Management (Felixstowe) Limited | Hospitality | 1979 |
| Eeeza Home(Uk) Ltd | Wholesale & retail | 2025 |
| Eismantas Transport Ltd | Transport & logistics | 2017 |
| EKT Electrical Ltd | Construction | 2016 |
| Elite Universal Forwarding (Logistics) Limited | Transport & logistics | 2019 |
| Elizabeth Althorpe Signature Homes Ltd | Real estate | 2024 |
| Elmax Management Ltd | Professional & scientific | 2010 |
| Elton Trans Limited | Transport & logistics | 2016 |
| Emdipe Ltd | Transport & logistics | 2021 |
| Emirates Acquisitions Ltd | Financial services | 2022 |
| Emirates Logistics Services Ltd | Transport & logistics | 2018 |
| Enduroventure Limited | Wholesale & retail | 2024 |
| Energy Freight Forwarding Limited | Transport & logistics | 2006 |
| Energy Gift Cards Limited | Extraterritorial | 2020 |
| Engines for Sale Limited | Extraterritorial | 2010 |
| Enviro Medical Limited | Health & social care | 1994 |
| Ercan Grill Ltd | Hospitality | 2025 |
| Erdav Ltd | Transport & logistics | 2025 |
| Escaping the Ratrace Limited | Manufacturing | 2026 |
| Esteban Gimpelewicz Lighting Ltd | Administrative & support | 2025 |
| Estlla UK Container Handling Ltd | Transport & logistics | 2025 |
| EU Lorry Driver Recruitment Agency Ltd | Transport & logistics | 2018 |
| EU Port Ukeig | | 2000 |
| EUF Express Air Limited | Other services | 1996 |
| EUF Holdings Limited | Professional & scientific | 1999 |
| Eufo Limited | Professional & scientific | 2003 |
| Euro Ccam Ltd | Transport & logistics | 2018 |
| Evans Cleaning Solutions Ltd | Administrative & support | 2020 |
| Exammark Ltd | Education | 2026 |
| Exodus Transport Ltd | Transport & logistics | 2013 |
| Express Global International Limited | Administrative & support | 2004 |
| Express Global Transport Limited | Transport & logistics | 2023 |
| Express United Freight Limited | Transport & logistics | 1977 |
| Extra Mile PR Ltd | Professional & scientific | 2022 |
| EYO Services Ltd | Transport & logistics | 2026 |
| F 2 S Ltd | Wholesale & retail | 2007 |
| Fair Breeze Limited | Hospitality | 2024 |
| Fairstep Solicitors Limited | Professional & scientific | 2017 |
| Fairview Property Management Ltd | Real estate | 2022 |
| Falina Limited | Hospitality | 2024 |
| Family Amusements Limited | Arts & recreation | 1981 |
| Fantasyparadigm Ltd | Wholesale & retail | 2024 |
| FC Properties Limited | Real estate | 2005 |
| Fcic Limited | Other services | 2005 |
| FCP UK Limited | Administrative & support | 2005 |
| FDO Trans Ltd | Transport & logistics | 2014 |
| FDR Logistics Ltd | Transport & logistics | 2024 |
| Felg Ltd | Transport & logistics | 2020 |
| Felix Enterprises Ltd | Construction | 2022 |
| Felix Kebab Ltd | Hospitality | 2025 |
| Felix R.W. Limited | Transport & logistics | 2015 |
| Felixstowe & Walton United Football Club Limited | Hospitality | 2016 |