| Edgewater Management Limited | Extraterritorial | 1995 |
| Edgewater NO. 2 Management Limited | Extraterritorial | 1996 |
| Edgewater Office Park Limited | Real estate | 1990 |
| EDI Morning Limited | Wholesale & retail | 2025 |
| Edie Properties Limited | Real estate | 2016 |
| Edinstewart Limited | Real estate | 2017 |
| EDL Group Holdings Limited | Financial services | 2023 |
| EDL Property Management Limited | Construction | 2023 |
| EDM Event Productions Limited | Arts & recreation | 2017 |
| Edmin Software Limited | Information & communication | 2018 |
| Edonedot Limited | Information & communication | 2024 |
| EDP Fleet Solutions Ltd | Wholesale & retail | 2022 |
| Edtap Limited | Information & communication | 2015 |
| Edtap Software Ltd | Information & communication | 2019 |
| Education and Coaching Gym Belfast Limited | Arts & recreation | 2023 |
| Education and Psychology Assessments N.I. Limited | Education | 2021 |
| Education Matters Partnership LLP | | 2012 |
| Education Protect Northern Ireland Limited | Financial services | 2020 |
| Educational Beauty Ltd | Other services | 2020 |
| Educational Voice Ltd | Education | 2019 |
| Educator's Toolkit Ltd | Education | 2022 |
| Edusoil CIC | Education | 2022 |
| Edward (NI) Limited | Construction | 2013 |
| Edward Dillon (Bonders) Limited | Administrative & support | 1968 |
| Edward Pearce Electrical Services Limited | Construction | 2017 |
| Edward Webb (Bangor) | Extraterritorial | 1979 |
| Edwards & Co. Solicitors | Professional & scientific | 2016 |
| Edwole Limited | Wholesale & retail | 2022 |
| EE Coates Management Limited | Professional & scientific | 2018 |
| Eeco Energy Limited | Construction | 2024 |
| Eenergy Services N.I. Limited | Wholesale & retail | 2020 |
| EF Technology Limited | Wholesale & retail | 2023 |
| Efast EMS UK Limited | Health & social care | 2023 |
| EFB Properties Ltd | Real estate | 2025 |
| Efbc Ltd | Professional & scientific | 2026 |
| Efekt Klimasa Ltd | Other services | 2024 |
| Efferent AI Ltd | Information & communication | 2026 |
| Efficient Claims Management Limited | Financial services | 2016 |
| Efficient Plumbing and Heating Services Ltd | Construction | 2021 |
| Efficient Supplies Limited | Wholesale & retail | 1987 |
| EFM Inns Ltd | Hospitality | 2024 |
| EG Genetics Limited | Manufacturing | 2020 |
| Eganam Management Company Limited | Households | 2007 |
| Egemen Online Trading Limited | Wholesale & retail | 2025 |
| Egis Lagan Services UK Limited | Construction | 2018 |
| Eglantine Church Mews Ltd | Households | 2022 |
| Eglantine Lodge Limited | Real estate | 2017 |
| Eglantine Studios Management Company Limited | Households | 1999 |
| Eglish Baking Company Ltd | Manufacturing | 2013 |
| Egnz QS Ltd | Professional & scientific | 2025 |
| Egreen Renewables Ltd | Manufacturing | 2023 |
| Egreen Renewables Property Ltd | Real estate | 2026 |
| EH (NO. 4) Limited | Construction | 2018 |
| EH Gillbard Limited | Wholesale & retail | 2023 |
| EH Rigging Limited | Other services | 2024 |
| Ehph Ltd | Professional & scientific | 2019 |
| EHS International Ventures (UK) Limited | Professional & scientific | 2024 |
| Ehtisham Prime Ltd | Wholesale & retail | 2025 |
| EI3 Ltd | Financial services | 2021 |
| EIA House Apartment Management Company Ltd | Households | 2009 |
| EIA Street Management Company Limited | Households | 2013 |
| Eibar Limited | Real estate | 2015 |
| Eide Clothing Limited | Wholesale & retail | 2025 |
| Eide Studio Limited | Information & communication | 2019 |
| Eidomition Limited | Professional & scientific | 2025 |
| Eight South Ltd | Hospitality | 2014 |
| Eighteen Oaks Limited | Construction | 2014 |
| EIGHTEEN10 Ltd | Financial services | 2021 |
| EIGHTY20 Focus Limited | Professional & scientific | 2009 |
| Eileen Donnelly Educational Development Ltd | Education | 2019 |
| Eileen Kelly Limited | Wholesale & retail | 2022 |
| Eileen's Day Today Ltd | Wholesale & retail | 2013 |
| Eilra Holdings Limited | Professional & scientific | 2022 |
| Eircom (UK) Limited | | 2002 |
| Eire Designs (Belfast) Limited | Manufacturing | 2011 |
| Eirewave Limited | Information & communication | 2021 |
| Eirgrid UK Holdings Limited | Professional & scientific | 2008 |
| Eirron Limited | Financial services | 2016 |
| Eirsise Limited | Professional & scientific | 2013 |
| Eirsise Trading Limited | Wholesale & retail | 2025 |
| Ejbk Holdings Ltd | Financial services | 2022 |
| EJC Contracts (Payroll) Limited | Administrative & support | 2021 |
| Ejeas Technology Co Limited | Wholesale & retail | 2025 |
| EJG Comms Ltd | Professional & scientific | 2016 |
| EJM Building & Carpentry Ltd | Construction | 2017 |
| EK Express Freight Limited | Transport & logistics | 2017 |
| EK Health Solutions Ltd | Health & social care | 2025 |
| Ekko Momentum Ltd | Hospitality | 2017 |
| Ekodura Ltd | Wholesale & retail | 2025 |
| Ekta Events C.I.C. | Education | 2013 |
| EL Consultancy Limited | Professional & scientific | 2002 |
| EL Illumination Limited | Wholesale & retail | 2014 |
| EL LP | | 2008 |
| EL Viaje Scents Ltd | Manufacturing | 2024 |
| El's Boutique Ltd | Wholesale & retail | 2026 |
| El-Madany Estate Ltd | Agriculture & fishing | 2017 |
| Elaine F Craig Ltd | Health & social care | 2019 |
| Elam Property Limited | Construction | 2007 |
| Elan Environmental Limited | Professional & scientific | 2010 |
| Elan Hair Belfast Ltd | Other services | 2015 |