| DTH (N.I.) Limited | Arts & recreation | 2022 |
| Duck Competitions Ltd | Arts & recreation | 2025 |
| Duffy Rafferty Holdings Ltd | Financial services | 1994 |
| Dumbworld Productions Ltd | Arts & recreation | 2009 |
| Dunluce Capital Management Ltd | Financial services | 2017 |
| Dunluce Capital Partners Ltd | Professional & scientific | 2026 |
| Dunluce Healthcare 2 Ltd | Health & social care | 2018 |
| Dunluce Healthcare 3 Ltd | Health & social care | 2019 |
| Dunluce Healthcare Bangor Ltd | Health & social care | 2017 |
| Dunluce Healthcare Bangor Propco Ltd | Health & social care | 2017 |
| Dunluce Healthcare CB Ltd | Construction | 2025 |
| Dunluce Healthcare Group Ltd | Health & social care | 2019 |
| Dunluce Healthcare Lisnaskea Ltd | Health & social care | 2023 |
| Dunluce Healthcare Ltd | Health & social care | 2017 |
| Dunluce Healthcare Newtownards Ltd | Health & social care | 2018 |
| Dunluce Healthcare Omagh Ltd | Health & social care | 2021 |
| E&D (N.I.) Limited | Real estate | 2020 |
| Eassni Limited | Administrative & support | 2018 |
| East Cheap Productions Limited | Information & communication | 2025 |
| East ST Films Ltd | Information & communication | 2021 |
| Easton Limited | Real estate | 2003 |
| Eaton Court Service Company Limited | Households | 2013 |
| Edenord Limited | Hospitality | 2020 |
| Education for Transfusion Practice C.I.C. | Administrative & support | 2015 |
| Efct Ltd | Information & communication | 2025 |
| EIGHT7 Capital Limited | Real estate | 2025 |
| EIGHT7 Holdings Limited | Households | 2015 |
| EL Abrigo (N.I.) | Administrative & support | 2020 |
| Element Seven Digital Limited | Information & communication | 2018 |
| Eligius Climate Control Ltd | Professional & scientific | 2018 |
| Elite Partnership N.I. Ltd | Construction | 2026 |
| Ellye Ltd | Wholesale & retail | 2023 |
| Elyod | Construction | 2025 |
| Embodyd Ltd | Wholesale & retail | 2024 |
| Empower Energy Systems Limited | Manufacturing | 2011 |
| Empower Generation Ltd | Energy | 2011 |
| Enco Consulting Ltd | Professional & scientific | 2017 |
| Endeavour Partners Ltd | Professional & scientific | 2025 |
| Energystore Limited | Construction | 1974 |
| Enhance Performance Systems Limited | Arts & recreation | 2019 |
| Enla Investments (NI) Limited | Financial services | 2021 |
| Enler Infrastructure Limited | Water & waste | 2022 |
| Ennis Enterprise Limited | Hospitality | 2011 |
| Enrite Limited | Hospitality | 1998 |
| EP 0001 Limited | Financial services | 2020 |
| Epec Retail Limited | Wholesale & retail | 2019 |
| Epicurean Partners Limited | Financial services | 2021 |
| Epicurian Deli Ltd | Wholesale & retail | 2022 |
| Equo Energy Company Limited | Energy | 2015 |
| Erectweld Limited | | 1971 |
| Erinem Ltd | Wholesale & retail | 2011 |
| Esplanade Management Ltd | Households | 2007 |
| Estelle Creations Ltd | Hospitality | 2026 |
| Ethico Holdings Ltd | Manufacturing | 2020 |
| Ethos Engagement Limited | Professional & scientific | 2015 |
| Ethos Yoga Limited | Arts & recreation | 2022 |
| Everville Estates Limited | Real estate | 2010 |
| Evolution Property Developments (NI) Ltd | Construction | 2013 |
| Exceed Nutrition Limited | Other services | 2016 |
| Expert Pensions Advice Australia Ltd | Professional & scientific | 2018 |
| Eziflo International Ltd | Manufacturing | 2018 |
| Farooq Management Ltd | Extraterritorial | 2013 |
| FAW Property Limited | Real estate | 2018 |
| Fellas Pasta Ltd | Hospitality | 2026 |
| Feranna Limited | Professional & scientific | 2010 |
| Ferguson Graham Builders Ltd | Construction | 2021 |
| Ferrard Meadow Management Company Limited | Real estate | 2011 |
| FG 1 Limited | Professional & scientific | 2014 |
| Fieldfisher Trading Legal Solutions LLP | | 2017 |
| Filmcraft Holdings (N.I.) Ltd | Financial services | 2022 |
| Financing London Ltd | Professional & scientific | 2011 |
| Finch Property Developments Ltd | Real estate | 2022 |
| Fine Tooth Forceps Limited | Other services | 2023 |
| Finesse at the Mews Ltd | Manufacturing | 2025 |
| First Ravenhill Reach Management Limited | Households | 1994 |
| Firth Merchandising Limited | Wholesale & retail | 2020 |
| Fisherwick Inns Limited | Real estate | 1983 |
| Fitzroy Building and Management Ltd | Construction | 2026 |
| Flat Calm Ltd | Information & communication | 2015 |
| Flatiron Belfast Limited | Real estate | 2016 |
| Flexicare EU OPS Limited | Manufacturing | 2025 |
| Flourishbyar Ltd | Wholesale & retail | 2021 |
| Flout (CC) Limited | Hospitality | 2025 |
| Flout! Ltd | Manufacturing | 2020 |
| Fomo Technology Ltd | Other services | 2015 |
| Forester Firm Consultancy Limited | Professional & scientific | 2024 |
| Foundations First Limited | Health & social care | 2016 |
| Four Ardmore Management Company Ltd | Households | 2021 |
| Fraeni Limited | Wholesale & retail | 2020 |
| Frances Investments Limited | Real estate | 2016 |
| Frankie and Doris Limited | Information & communication | 2019 |
| Franklynn One Limited | Financial services | 2015 |
| Freecrow Productions Ltd | Information & communication | 2021 |
| Freight Partnership Ltd | Transport & logistics | 2012 |
| Fsreg Consulting Ltd | Professional & scientific | 2025 |
| FT 1 Limited | Professional & scientific | 2009 |
| FT Nominees Limited | Professional & scientific | 2009 |
| FT3 Limited | Professional & scientific | 2008 |
| Ftsie Holdings Limited | Real estate | 2008 |
| Ftsie Limited | Real estate | 2008 |