| Employee Wellbeing Ltd | Administrative & support | 2005 |
| Employers for Childcare | Administrative & support | 2002 |
| Employers for Childcare Trading Limited | Administrative & support | 2004 |
| Empowered Parents Ltd | Education | 2024 |
| Emtek Ireland Limited | Construction | 2014 |
| Englishcafe Ltd | Education | 2012 |
| Englishsignalling Ltd | Construction | 2025 |
| Ennisburn Properties Ltd | Real estate | 2003 |
| Enovitcon Ltd | Information & communication | 2024 |
| ENT Ireland Ltd | Health & social care | 2024 |
| Environmental Chemical Engineering Services Ltd | Manufacturing | 2017 |
| Environmental Techniques Limited | Construction | 1992 |
| Envisage Software Limited | Information & communication | 2015 |
| Epic Staff Ltd | Professional & scientific | 2017 |
| Erjo Investments Ltd | Real estate | 2024 |
| Erjo Properties Ltd | Real estate | 2024 |
| Erjo Revive Ltd | Real estate | 2025 |
| ESG Contracts Ltd | Construction | 2026 |
| ESG Infracomms Ltd | Construction | 2026 |
| ESG Power Ltd | Construction | 2026 |
| ESG Water Ltd | Construction | 2026 |
| Esha & Sushruth Limited | Households | 2017 |
| Eskay Merchandising Limited | Administrative & support | 2022 |
| Esni Property Ltd | Households | 2023 |
| ESP (NI) Ltd | Information & communication | 2004 |
| Essence Interiors Lisburn Limited | Wholesale & retail | 2011 |
| Ethanm Limited | Professional & scientific | 2019 |
| Ettonhall Properties LLP | | 2018 |
| Euro Domestic Marketing Ltd | Wholesale & retail | 1995 |
| Euromineral Trade LP | | 2018 |
| European Christian Mission Ireland | Other services | 2016 |
| European Jewels Ltd | Wholesale & retail | 2020 |
| European Trade & Export Solutions LP | | 2026 |
| Evans Plant Limited | Construction | 1987 |
| Event & Access Solutions Ltd | Construction | 2011 |
| Events by ERA Ltd | Hospitality | 2025 |
| Everburn Productions Ltd | Information & communication | 2025 |
| Everwatch Cctv Limited | Extraterritorial | 2006 |
| Everwatch Limited | Extraterritorial | 2006 |
| Excellence Barbering Academy Ltd | Education | 2024 |
| Exchange Accountants Limited | Professional & scientific | 2011 |
| Exchange Taxation Services LLP | | 2011 |
| Excite Promotional Merchandise Ltd | Other services | 2012 |
| Excitonium Ventures Limited | Financial services | 2020 |
| Exclusive Cabinetry Ltd | Manufacturing | 2023 |
| Executive Capital Resources Limited | Professional & scientific | 2024 |
| Executive Landscape & Design Limited | Professional & scientific | 2022 |
| Exhibition Installations Ltd. | Administrative & support | 2020 |
| Exodus Trust | Other services | 2007 |
| Express Blooms Ltd | Wholesale & retail | 2012 |
| Express Track Deliveries Limited | Transport & logistics | 2018 |
| Expressoo Ltd | Hospitality | 2024 |
| Extraction Technologies (IP) Limited | Administrative & support | 2019 |
| EYE & ENT NI Limited | Health & social care | 2017 |
| F&H Prestige Ltd | Administrative & support | 2024 |
| Fabrite Enterprises Limited | Professional & scientific | 2020 |
| Fabrite Facades Limited | Construction | 2011 |
| Fabrite Holdings Limited | Professional & scientific | 2007 |
| Fabrite Interior Fit-Out Ltd | Construction | 2009 |
| Fabrite Solutions Limited | Construction | 2011 |
| Fade Room NO.9 Ltd | Other services | 2025 |
| Fagan Stores Ltd | Wholesale & retail | 2021 |
| Fairhaven H & V Services Limited | Wholesale & retail | 1999 |
| Fairmont Ventures LLP | | 2025 |
| Fairview Estates Limited | Construction | 2005 |
| Fairview Plant Ltd | Construction | 2021 |
| Falico UK Engine Truck Parts Import Export Ltd | Wholesale & retail | 2025 |
| Famowol Ltd | Wholesale & retail | 2026 |
| Farnley Enterprises Limited | Extraterritorial | 2002 |
| Farooq and Noor Ahmed Ltd. | Other services | 2004 |
| Faspeed Limited | Wholesale & retail | 2024 |
| Fast Fresh Foods Ltd | Hospitality | 2016 |
| Fastech Markets Limited | Financial services | 2017 |
| Fastway Transportation Limited | Transport & logistics | 2018 |
| Fathposeu Ltd | Wholesale & retail | 2026 |
| Fauxes LP | | 2019 |
| FC Orthopaedics Ltd | Health & social care | 2017 |
| Feather and Fortune Ltd | Professional & scientific | 2011 |
| Felekoglu Kurdish Transport Limited | Transport & logistics | 2021 |
| Feminine Touch NI Ltd | Other services | 2023 |
| Feramart Ltd | Professional & scientific | 2025 |
| Ferney Properties Limited | Construction | 2006 |
| Ferrous Services Ltd | Construction | 2025 |
| Festival Trading Limited | Arts & recreation | 2015 |
| Feystown Wind Farm Ltd | Energy | 2016 |
| FFS Properties Limited | Real estate | 2022 |
| Fgeair LUO Ltd | Wholesale & retail | 2025 |
| FHL Marketing Ltd | Wholesale & retail | 2023 |
| FHS Group Limited | Financial services | 1984 |
| Fibre & Civils Limited | Construction | 2023 |
| Fields of Life Trust | Other services | 1996 |
| Filicor Associates Limited | Information & communication | 2017 |
| Finaghy Road North Management Company Limited | Households | 2010 |
| Finch & Partners - Business Solutions Ltd | Professional & scientific | 2018 |
| Finest Blinds (Lisburn) Ltd | Wholesale & retail | 2020 |
| Finest Flowers Ltd | Wholesale & retail | 2022 |
| Finimpor & Associates Legal Advisory Limited | Information & communication | 2017 |
| Finstrumental Ltd | Information & communication | 2026 |
| Fire NI Group Ltd | Construction | 2017 |
| Fire Stop Consultancy Ltd | Other services | 2023 |