| Exspiro Ltd | Information & communication | 2023 |
| Exsto 361 Ltd | Arts & recreation | 2016 |
| Exsto Apparel Limited | Arts & recreation | 2016 |
| Exsurgo Labs Limited | Information & communication | 2014 |
| Extcomfort International Group Co Limited | Wholesale & retail | 2025 |
| Extension Trading Limited | Wholesale & retail | 2025 |
| Extensions (N.I.) Ltd | Other services | 2019 |
| EXTN5 Limited | Administrative & support | 2010 |
| Extras (NI) Ltd | Information & communication | 2007 |
| Extraspace Solutions (UK) Limited | Construction | 2004 |
| Extratax Training Limited | Education | 2019 |
| Extreme Cleaning Services Ireland Ltd | Administrative & support | 2025 |
| Exxcon Ltd | Wholesale & retail | 2025 |
| Exxero Gadgets Limited | Wholesale & retail | 2026 |
| Exyozy Limited | Arts & recreation | 2018 |
| Eydesa Ltd | Wholesale & retail | 2025 |
| EYE Care of Belfast Limited | Health & social care | 1985 |
| EYE Comfort Ltd | Health & social care | 2012 |
| EYE Cove Limited | Manufacturing | 2017 |
| EYE Nutrients Ltd | Health & social care | 2015 |
| EYE Opener Opticians Limited | Extraterritorial | 2006 |
| EYE4EDUCATION LLP | | 2014 |
| Eyecare Arches Ltd | Health & social care | 2011 |
| Eyecare Bangor Ltd | Health & social care | 2011 |
| Eyecare Carrickfergus Ltd | Health & social care | 2011 |
| Eyecare Cookstown Ltd | Health & social care | 2011 |
| Eyecare Newtownards Ltd | Health & social care | 2011 |
| Eyecare Yorkgate Ltd | Health & social care | 2011 |
| Eyedrive Camera Solutions Limited | Information & communication | 2025 |
| Eyedrive Security Solutions Limited | Administrative & support | 2025 |
| Eyefall International Limited | Professional & scientific | 2013 |
| Eyeomics Limited | Professional & scientific | 2019 |
| Eyesparks Limited | Professional & scientific | 2017 |
| Eypins Technology Limited | Wholesale & retail | 2025 |
| Eyrie Homes Ltd | Construction | 2022 |
| EZ Films Limited | Information & communication | 2019 |
| EZ Living Ballymena Limited | Wholesale & retail | 2023 |
| EZ Living Banbridge Limited | Wholesale & retail | 2022 |
| EZ Living Enniskillen Limited | Wholesale & retail | 2023 |
| EZ Living Furniture and Interiors Limited | Wholesale & retail | 2015 |
| EZ Living Holywood Limited | Wholesale & retail | 2017 |
| EZ Living Interiors Coleraine Ltd | Real estate | 2021 |
| EZ PZ Property Limited | Real estate | 2016 |
| Ezan Associates Ltd | Administrative & support | 2021 |
| EZE Gaming Limited | Arts & recreation | 2013 |
| Ezoto Ltd | Wholesale & retail | 2026 |
| EZY IT (Tech) Limited | Information & communication | 2026 |
| Ezyletz Ltd | Real estate | 2025 |
| Ezzy TCG Ltd | Wholesale & retail | 2025 |
| F a Critchlow Ltd | Wholesale & retail | 2023 |
| F a MAY Ltd | Wholesale & retail | 2023 |
| F C C S Shelf Company (NO 5) Limited | | 1994 |
| F G Electrics Ltd | Construction | 2025 |
| F K Lowry Limited | Construction | 1981 |
| F K Lowry Plant Limited | Administrative & support | 2011 |
| F Mcintyre Consultancy Ltd | Professional & scientific | 2013 |
| F O I S Limited | Construction | 2003 |
| F O'Neill Brickwork Ltd | Construction | 2026 |
| F S IT Product Services Ltd | | 2006 |
| F T Acad. Ltd | Health & social care | 2020 |
| F T Medical Ltd | Health & social care | 2020 |
| F.A. Wellworth and Company Limited | Real estate | 1936 |
| F.M. Stewart & Associates Limited | Construction | 2005 |
| F.Moorhead & Co. Limited | Wholesale & retail | 1965 |
| F5 Property Limited | Real estate | 2015 |
| F7 Trading Co Ltd. | Wholesale & retail | 2018 |
| FA Qing YU Ltd | Wholesale & retail | 2023 |
| Fabaglen Ltd | Professional & scientific | 2008 |
| Fabel Productions Ltd | Information & communication | 2021 |
| Fabiia Ireland Limited | Wholesale & retail | 2021 |
| Fable and Ember Limited | Wholesale & retail | 2025 |
| Fableforge Ltd | Information & communication | 2023 |
| Fabron Paget Visualante Photography 1LIMITED Limited | Professional & scientific | 2020 |
| FAC73 Ltd | Information & communication | 2024 |
| Face & Co (2024) Ltd | Other services | 2024 |
| Face Therapy NI Limited | Health & social care | 2019 |
| Face&Co Belfast Ltd | Other services | 2020 |
| Facere Ltd | Professional & scientific | 2023 |
| Facetrip Ltd | Other services | 2023 |
| Facial Aesthetics (NI) Ltd | Health & social care | 2013 |
| Facial Line Softening Ltd | Other services | 2010 |
| Facialist Recommends Limited | Other services | 2025 |
| FACILIT8 N.I Limited | Administrative & support | 2024 |
| Facilitate Agencies Europe Limited | Administrative & support | 2008 |
| Factcheckni CIC | Professional & scientific | 2019 |
| Factory Direct Import Ltd | Wholesale & retail | 2024 |
| FACTORY30 Ltd | Information & communication | 2024 |
| Factotum Arts Northern Ireland | Information & communication | 2010 |
| Fada Studio Ltd | Professional & scientific | 2025 |
| Fafachang Limited | Wholesale & retail | 2025 |
| Fagan Pipe Installation Ltd | Construction | 2025 |
| FAI Kian Limited | Wholesale & retail | 2025 |
| Failte Feirste Thiar Ltd | Arts & recreation | 2007 |
| Fair Conshop Limited | Wholesale & retail | 2025 |
| Fair Deal Caravans Ltd | Wholesale & retail | 2019 |
| Fair Game Social Enterprise CIC | Professional & scientific | 2026 |
| Fair Trade-In-Spires | Wholesale & retail | 2004 |
| Fairbuild Homes (NI) Ltd | Construction | 2001 |
| Fairburn Fitness Ltd | Other services | 2022 |
| Fairco Mcilhagga Limited | Construction | 2009 |