| Erne Fabrication Ltd | Manufacturing | 2025 |
| Erne Facades Limited | Construction | 2019 |
| Erne Financial Services Ltd | Financial services | 2010 |
| Erne Food Machinery Ltd | Wholesale & retail | 2026 |
| Erne Forestry Services Limited | Professional & scientific | 1988 |
| Erne Form Limited | Extraterritorial | 2024 |
| Erne General Construction Ltd | Construction | 2026 |
| Erne Holistics Limited | Other services | 2018 |
| Erne Imaging Ltd | Health & social care | 2024 |
| Erne Insulation Limited | Construction | 2006 |
| Erne Integrated College Limited | Education | 1994 |
| Erne Lifting Services Ltd | Manufacturing | 2006 |
| Erne Marine Management Company Limited | Extraterritorial | 2005 |
| Erne Paddlers | Arts & recreation | 2016 |
| Erne Pharmacy Limited | Wholesale & retail | 2017 |
| Erne Property Solutions Ltd | Construction | 2025 |
| Erne Rentals & Property Sales Ltd | Real estate | 2003 |
| Erne Resin & Property Maintenance Ltd | Construction | 2025 |
| Erne Rivers Trust | Agriculture & fishing | 2014 |
| Erne Sales Ltd | Wholesale & retail | 2016 |
| Erne Security Services Limited | Administrative & support | 2025 |
| Erne Shore DEV Ltd | Construction | 2005 |
| Erne Skip Hire & Recycling Limited | Water & waste | 2016 |
| Erne Steel & Rigging Ltd | Construction | 2019 |
| Erne Tours Limited | Transport & logistics | 1976 |
| Erne Training Ltd | Transport & logistics | 2017 |
| Erne Tree Amigos Ltd | Administrative & support | 2026 |
| Erne Tutor Services Limited | Education | 2023 |
| Erne Tyres Limited | Wholesale & retail | 2022 |
| Erne Ventilation Limited | Construction | 2020 |
| Erne Veterinary Group Limited | Professional & scientific | 2025 |
| Erne View Limited | Wholesale & retail | 2014 |
| Erne View Properties Limited | Real estate | 2017 |
| Erne Vintage Car Club Limited | Arts & recreation | 2006 |
| Erne Wind Limited | Energy | 2015 |
| Ernecast Limited | Manufacturing | 2015 |
| Erneit Limited | Information & communication | 2017 |
| Ernetech Solutions Limited | Construction | 2024 |
| Errigal Enterprises Limited | Wholesale & retail | 2009 |
| ESR Properties Limited | Real estate | 2018 |
| Estcsha Limited | Professional & scientific | 2026 |
| ETB Investments (NI) Limited | Real estate | 2018 |
| Eurhome UK and Ireland Limited | Wholesale & retail | 2026 |
| European Direct Solutions Limited | Wholesale & retail | 2017 |
| EV Chargers Ireland Ltd | Construction | 2022 |
| Ever Digital Ltd | Information & communication | 2024 |
| Everseer Ltd | Professional & scientific | 2025 |
| Every Season Grounds Maintenance Ltd | Administrative & support | 2024 |
| Evoglo Ltd | Manufacturing | 2023 |
| EW Property Ltd | Real estate | 2018 |
| Ewing Enterprises Ltd | Wholesale & retail | 2010 |
| Ewing Haulage Ltd | Transport & logistics | 2015 |
| Explore Fermanagh Limited | Information & communication | 2025 |
| Express Road Freight Ltd | Transport & logistics | 2018 |
| EZ Management Software Ltd | Information & communication | 2020 |
| F & F Properties Limited | Real estate | 2009 |
| F a L Holdings Ltd | Financial services | 2021 |
| F.A.C.T. (Friendship and Caring Trust) Limited | Health & social care | 1996 |
| F.A.L Plant & Tool Hire Ltd | Administrative & support | 2006 |
| Fabwork Limited | Professional & scientific | 2020 |
| Faella Trading Ltd | Wholesale & retail | 2024 |
| Fairfield Renewables Limited | Energy | 2016 |
| Fairway 4 Limited | Households | 2024 |
| Faisi Limited | Wholesale & retail | 2021 |
| Falcon Crest Distribution Limited | Transport & logistics | 2017 |
| Falls & Hanna Solicitors Limited | Professional & scientific | 2012 |
| Falls Consultancy Ltd | Financial services | 2020 |
| Farcite Ltd | Professional & scientific | 2025 |
| Faring Trading Limited | Wholesale & retail | 2024 |
| Farlough Sales Units Limited | Real estate | 2018 |
| Farm Design Solutions Ltd. | Professional & scientific | 2019 |
| Farmcare Products Ltd | Wholesale & retail | 2021 |
| Farmlink NI Ltd | Wholesale & retail | 2026 |
| Farnham Consulting (NI) Limited | Professional & scientific | 2012 |
| FBC Solutions (NI) Limited | Administrative & support | 2019 |
| FD & HC Management Limited | Real estate | 2010 |
| FEE Clad Ltd | Construction | 2023 |
| FEE Engineering Limited | Construction | 2017 |
| Feewise Solutions Limited | Professional & scientific | 2025 |
| Feirin & Co Limited | Financial services | 2024 |
| Felim Mulligan Limited | Construction | 2015 |
| Fergusons Solicitors Limited | Professional & scientific | 2018 |
| Fermanagh 4X4 Wheels Ltd | Wholesale & retail | 2023 |
| Fermanagh Adhd Services Ltd | Health & social care | 2025 |
| Fermanagh Arts Festival | Arts & recreation | 2007 |
| Fermanagh Autopart Centre Ltd | Wholesale & retail | 2022 |
| Fermanagh Beer Company Limited | Manufacturing | 2016 |
| Fermanagh Car Parts Ltd | Wholesale & retail | 2022 |
| Fermanagh Christian Fellowship | Other services | 2014 |
| Fermanagh Community Transport | Transport & logistics | 2011 |
| Fermanagh Enterprise Limited | Administrative & support | 1985 |
| Fermanagh Eyecare Ltd | Wholesale & retail | 2021 |
| Fermanagh Fruit Co Limited | Wholesale & retail | 2022 |
| Fermanagh Genealogy Centre | Information & communication | 2012 |
| Fermanagh Lakeland Tourism Limited | Other services | 2000 |
| Fermanagh Metals Limited | Water & waste | 2013 |
| Fermanagh Motorcycle Club Ltd | Arts & recreation | 2017 |
| Fermanagh Pedigree Livestock Breeders Ltd | Agriculture & fishing | 2003 |
| Fermanagh Pest Control Ltd | Administrative & support | 2010 |
| Fermanagh Properties Limited | Hospitality | 1982 |