| Duddy Portugal Limited | Real estate | 2018 |
| Duddy Property Limited | Real estate | 2017 |
| DUE North Foundation Limited | Education | 2026 |
| Dunbar Electrics Limited | Construction | 2023 |
| Dunboe Properties Ltd | Real estate | 2022 |
| Dundarave Estates Limited | Agriculture & fishing | 1954 |
| Dundooan Estate Limited | Other services | 2012 |
| Dunlerin Electrical Limited | Construction | 2021 |
| Dunlop Leisure Ltd | Arts & recreation | 2023 |
| Dunluce Capital Limited | Financial services | 2010 |
| Dunluce Developments Limited | Construction | 2018 |
| Dunluce Properties NO.1 Limited | Financial services | 2025 |
| Dunluce Restaurants Limited | Hospitality | 1994 |
| Dunmore House Management Company Ltd | Households | 2010 |
| DVL Group NI Ltd | Administrative & support | 2021 |
| E. Herald Properties Limited | Real estate | 2023 |
| E. Mcintyre & Sons Limited | Wholesale & retail | 2000 |
| EAG Ardboe Limited | Water & waste | 2022 |
| EAG Eglinton Limited | Water & waste | 2022 |
| EAG Loughgall Limited | Water & waste | 2022 |
| Eagle Glen Community Partnership Ltd | Arts & recreation | 2011 |
| Eakin Holdings Ltd | Real estate | 2018 |
| Eamon Mccloskey Contracts Ltd | Construction | 2019 |
| Earl Lewis Limited | Professional & scientific | 2003 |
| East & West Coast Films Ltd | Information & communication | 2025 |
| Easycharge (NI) Limited | Construction | 2023 |
| Easycharge (UK) Limited | Construction | 2023 |
| Eaton Fields Management Ltd | Extraterritorial | 2013 |
| Eco Outdoor Services Ltd | Administrative & support | 2018 |
| Eco Turf Ltd | Construction | 2011 |
| Edenhill Contracts Limited | Construction | 2025 |
| Edenmore Management Company (Number 2) Limited | Households | 2004 |
| Edenmore Management Company Limited | Households | 2003 |
| Edgar Removals & Storage Ltd | Transport & logistics | 2025 |
| Edgewater Plant Limited | Manufacturing | 2024 |
| Efficient Utility Ltd | Construction | 2015 |
| EJB Car Sales Ltd | Wholesale & retail | 2012 |
| Ekam Holdings Limited | Financial services | 2016 |
| Elevate (N.I) Ltd | Construction | 2022 |
| Elite Components Ltd | Manufacturing | 2015 |
| Elite Dent Repair Limited | Wholesale & retail | 2024 |
| Elite Ireland Ltd | Wholesale & retail | 2012 |
| ELJ Holdings Limited | Financial services | 2025 |
| Ellarose Holdings (Northern Ireland) Ltd | Financial services | 2021 |
| ELUCID8 Holdings Ltd. | Professional & scientific | 2015 |
| Emerald Coast Renewables Limited | Construction | 2025 |
| EMG Trading (Ballymena) Limited | Wholesale & retail | 2013 |
| Energy Acquisitions Group Limited | Construction | 2019 |
| Engineering Equipment Sales & Services (N.I.) Limited | Wholesale & retail | 2022 |
| Enterprise Causeway Ltd | Administrative & support | 1984 |
| Enzo Portrush Limited | Construction | 2020 |
| EPJ Developments Ltd | Construction | 2025 |
| Equiptech Trading Ltd | Wholesale & retail | 2025 |
| Equitable Homes Ltd | Real estate | 2025 |
| Ergana Corn Mill Limited | Manufacturing | 2018 |
| Escir Rentals Ltd | Real estate | 2020 |
| Eskra Management Limited | Households | 2017 |
| EUC Global Ltd | Information & communication | 2014 |
| Eureka Lettings Solutions Ltd | Real estate | 2021 |
| Eureka Property Solutions Ltd | Real estate | 2020 |
| Evajam Holdings Ltd | Real estate | 2025 |
| Event AV (NI) Ltd | Professional & scientific | 2016 |
| Evish Contracts Ltd | Construction | 2017 |
| Exorna Limited | Wholesale & retail | 2011 |
| Exorna Properties Limited | Real estate | 2007 |
| F Mullan Electrical Ltd | Construction | 2020 |
| Facial Features Aesthetics Ltd | Health & social care | 2023 |
| Fairview Apartments Management Company Limited | Households | 2007 |
| Fairways (Prehen) Property Management Company (N.I.) Limited | Households | 2017 |
| Fairways Lough Road Ltd | Households | 2015 |
| Farlow Properties Limited | Hospitality | 2003 |
| Farnmore Contracts Limited | Construction | 2023 |
| Farnmore Investments Limited | Real estate | 2025 |
| Fast Timber Solutions Limited | Manufacturing | 2013 |
| Fbayda Ltd | Wholesale & retail | 2025 |
| Feneco Systems Limited | Construction | 2011 |
| Ferguson House Properties Ltd | Real estate | 2015 |
| Ferryx R&D Limited | Professional & scientific | 2024 |
| Fiden Enterprises Limited | Agriculture & fishing | 1998 |
| Finegan Food Consultancy Limited | Professional & scientific | 2026 |
| Finiskin Limited | Real estate | 1999 |
| Fire Engineering Ltd | Construction | 2015 |
| First 4 Printing (NI) Limited | Manufacturing | 2013 |
| First Class Crates Ltd | Wholesale & retail | 2024 |
| First for Trailers Ltd | Manufacturing | 2023 |
| Firstforsheds Ltd | Wholesale & retail | 2022 |
| Firstforstone Ltd | Construction | 2024 |
| Fish Mourne Limited | Agriculture & fishing | 2010 |
| Focus Bricklayers Limited | Construction | 2019 |
| Focus on Family Nurturing and Development Centre | Health & social care | 2012 |
| Focused on Data Limited | Information & communication | 2019 |
| Forestside Court Garvagh Management Ltd | Households | 2019 |
| Forestview Investments Limited | Financial services | 2016 |
| Forestviewliving Limited | Construction | 2025 |
| Forge Apartments Management Company Limited | Households | 2006 |
| Forge UP Ltd | Information & communication | 2026 |
| Foster Medico-Legal Ltd | Professional & scientific | 2015 |
| Foundry Court (Brook Street, Coleraine) Services Limited | Households | 2001 |
| Fountain Court Services Limited | Households | 2005 |
| Foxton Management Company Limited | Extraterritorial | 2015 |