| Drumrainey Ltd | Professional & scientific | 2013 |
| DTL Construction Limited | Construction | 2011 |
| DTM Electrics Ltd | Construction | 2021 |
| Duffin Construction Services Ltd | Construction | 2019 |
| Duggan Concrete Limited | Manufacturing | 2020 |
| Dunard Investments Ltd | Real estate | 2018 |
| Dunbann Contracts Ltd | Administrative & support | 2019 |
| Dunlogan Hydro Ltd | Energy | 2014 |
| Dysart Energy Limited | Energy | 2012 |
| E C Construction Ltd | Construction | 2000 |
| E Flanagan Contracts Ltd | Construction | 2018 |
| Eagle Surveyors (N.I.) Ltd | Real estate | 2023 |
| Eagle Utilities Ltd | Construction | 2017 |
| Eagle-Glen Limited | Hospitality | 2013 |
| Edendale Developments Limited | Construction | 1997 |
| Edenderry Property Management Limited | Households | 2022 |
| Edenkeel Limited | Hospitality | 1999 |
| Edgeline Metal Roofing Limited | Construction | 2000 |
| Effectivise Ltd | Professional & scientific | 2024 |
| Eglantine Estates Ltd | Financial services | 2023 |
| Elder Crescent Company Limited | Financial services | 2020 |
| Elevate Ward Design Limited | Professional & scientific | 2019 |
| Elisei’S Carwash/Straw Carwash Limited | Administrative & support | 2025 |
| Elite Fixings Ltd | Wholesale & retail | 2023 |
| Elite Pizzas Limited | Hospitality | 2011 |
| Elixsr Ltd | Information & communication | 2014 |
| Elle Home Ltd | Wholesale & retail | 2021 |
| Ellegreen Ltd | Professional & scientific | 2025 |
| ELM Cresent Company Limited | Extraterritorial | 2016 |
| ELM Forestry and Landscaping Ltd | Administrative & support | 2010 |
| ELM View Company Limited | Professional & scientific | 2015 |
| Elmsford Limited | Financial services | 2025 |
| Elqd (Vend) Ltd | Wholesale & retail | 2022 |
| Elvstone Holdings Limited | Information & communication | 2021 |
| EML Electrical & Testing Services Ltd | Construction | 2023 |
| Emma Kearney Academy of Hair & Beauty Ltd | Other services | 2021 |
| Enhance Home Staging Ltd | Administrative & support | 2022 |
| Enkalon Accident Repair Centre Ltd | Wholesale & retail | 2024 |
| Enlim Excavations Limited | Construction | 2005 |
| EOP Contracts Ltd | Construction | 2024 |
| EPJ Ltd | Energy | 2012 |
| Escape Beauty Retreat Ltd | Other services | 2019 |
| Escapod Limited | Administrative & support | 2013 |
| ESH Property Limited | Real estate | 2024 |
| ESR Enterprise Limited | Wholesale & retail | 2010 |
| Essential Designs (NI) Ltd | Manufacturing | 2001 |
| ET NI Travel Ltd | Transport & logistics | 2009 |
| Everyday Cosmetics Ltd | Wholesale & retail | 2011 |
| Exrt Intelligent Healthcare Limited | Health & social care | 2019 |
| F & F Bookkeeping Services Limited | Professional & scientific | 2025 |
| F Mckenna Machine Services Ltd | Manufacturing | 2021 |
| Falcon Trailers Limited | Professional & scientific | 2017 |
| Farmvet Systems Ltd | Information & communication | 2010 |
| FC Services NI Ltd | Manufacturing | 2025 |
| FCG Property (NI) Ltd | Real estate | 2023 |
| FCO Ltd | Arts & recreation | 2009 |
| FCR Limited | Construction | 2005 |
| Feather Fields Farm Ltd | Manufacturing | 2025 |
| Fern Enterprises Limited | Wholesale & retail | 1997 |
| Fernhaven Developments Limited | Real estate | 2005 |
| FFC Bookkeeping Limited | Professional & scientific | 2023 |
| Filtered Mfelt Ltd | Hospitality | 2026 |
| Finafaze Ltd | Professional & scientific | 2025 |
| Finclare Limited | Construction | 2016 |
| Finglen North Ltd | Agriculture & fishing | 2025 |
| Fintec Limited | Information & communication | 2003 |
| Fintragh Limited | Real estate | 2006 |
| Fiolta Digital Ltd | Information & communication | 2026 |
| Fiona Mulholland Limited | Real estate | 2021 |
| Fire Glass Direct Ireland Ltd | Manufacturing | 2004 |
| FJS Contracts Ltd | Construction | 2016 |
| Flame & Fork Ltd | Hospitality | 2026 |
| Flange Furniture Limited | Wholesale & retail | 2024 |
| Flash Elec Tech Limited | Construction | 2011 |
| Flipsake Holdings Ltd | Financial services | 2022 |
| Florida Essential Solutions Limited | Administrative & support | 2025 |
| Fortyfour Interiors Ltd | Professional & scientific | 2021 |
| Found Holdings Ltd | Financial services | 2025 |
| Fourds Limited | Manufacturing | 2005 |
| FP Mccann Group Limited | Financial services | 2016 |
| FPL Contracts Limited | Construction | 2017 |
| FPM Contracts Limited | Financial services | 2026 |
| FPM Investments Ltd | Financial services | 2021 |
| FPM Plastics Limited | Financial services | 2026 |
| FPM Quarries Limited | Financial services | 2015 |
| FPM Readymix Limited | Financial services | 2026 |
| Frances Stewart Limited | Health & social care | 2012 |
| Friends of ST. Colm's | Other services | 2005 |
| Fulton Motors Ltd | Wholesale & retail | 2024 |
| Fulton Zondo Limited | Health & social care | 2023 |
| FUNDAMENTAL360 Ltd | Professional & scientific | 2025 |
| Fundraising Solutions Ireland Ltd | Administrative & support | 2021 |
| Furniture World (Cookstown) Limited | Wholesale & retail | 2015 |
| Furniture World MF Limited | Wholesale & retail | 2011 |
| Fíorlaoch Apparel Ltd | Wholesale & retail | 2025 |
| G & K Sperrin Holdings Limited | Financial services | 2025 |
| G & K Sperrin Properties Ltd | Real estate | 2023 |
| G & R Stock Limited | Real estate | 1989 |
| G Baird Holdings Ltd | Professional & scientific | 2025 |
| G O’Hagan Contracts Ltd | Construction | 2025 |