| Fermanagh Rural Community Initiative | Education | 1992 |
| Fermanagh Rural Community Network | Other services | 2004 |
| Fermanagh School of Music CIC | Education | 2025 |
| Fermanagh Stage School CIC | Education | 2025 |
| Fermanagh Under-Age Entertainment Life (F.U.E.L.) | Other services | 2011 |
| Fermanagh Wheels Ltd | Wholesale & retail | 2022 |
| Fermanagh Women's AID | Other services | 1997 |
| Fermanagh Youth Choir CIC | Education | 2025 |
| Ferney Brickworks Ltd | Construction | 2019 |
| FFS Car Imports Ltd | Wholesale & retail | 2010 |
| Fifty Five Property Solutions Ltd | Real estate | 2026 |
| Fifty Five Resins Ltd | Construction | 2025 |
| Finn Lough Limited | Hospitality | 2014 |
| Finnbarr Fire Barriers Ltd | Construction | 2024 |
| Finnigan's Play PEN Limited | Manufacturing | 2020 |
| Finshield Limited | Professional & scientific | 2005 |
| First Glimpse Ultrasound NI Ltd | Health & social care | 2023 |
| Fisher Holdings (N.I.) Limited | Real estate | 2007 |
| Fishing Tackle and Bait Limited | Wholesale & retail | 2016 |
| Fit by Lauren J Ltd | Arts & recreation | 2022 |
| Five Points Windfarm Limited | Energy | 2015 |
| Flamingo Consulting Ltd | Professional & scientific | 2019 |
| Flavour and Spice NI Limited | Hospitality | 2025 |
| Flecto Engineering Limited | Manufacturing | 2015 |
| Fleet Direct Limited | Wholesale & retail | 2017 |
| FLJ Properties Limited | Real estate | 2020 |
| FM Fire Safety Limited | Public administration | 2018 |
| FM Metals Limited | Water & waste | 2012 |
| Fmst Holdings (UK) Unlimited | Financial services | 2026 |
| FMZ Global Tech Ltd | Wholesale & retail | 2021 |
| Foedo Ltd | Professional & scientific | 2021 |
| Folk Espresso Ltd | Hospitality | 2024 |
| Footwear Solutions NI Limited | Wholesale & retail | 2018 |
| FOR. Rest. Fermanagh CIC | Education | 2025 |
| Forest Inn Ltd | Hospitality | 2025 |
| Forthill Media Ltd | Professional & scientific | 2015 |
| Forthill Properties Ltd | Construction | 2012 |
| Fortuna 2026 Ltd | Hospitality | 2026 |
| Fountain (NI) Limited - the | Other services | 1999 |
| Fourways Enterprises Limited | Real estate | 2003 |
| FOY & Company (N.I) Limited | Wholesale & retail | 2023 |
| FOY Agri Contracts Ltd | Agriculture & fishing | 2025 |
| FOY Auto Services Ltd | Wholesale & retail | 2024 |
| Francis Drumm Limited | Construction | 2002 |
| Frank Mcdonnell's Public House Ltd | Hospitality | 2026 |
| Fransys Consulting Ltd | Information & communication | 2018 |
| Frazer One Stop Shop Ltd | Wholesale & retail | 2009 |
| Freeman Plaster Mouldings Ltd | Construction | 2011 |
| Fresh Faces Aesthetic Clinic Ltd. | Health & social care | 2014 |
| Friends Forever Ltd | Real estate | 2017 |
| FST Services ENK Limited | Wholesale & retail | 2018 |
| Fuel Takeaway Ltd | Hospitality | 2026 |
| Fuels & Lubricants (Enniskillen) | Wholesale & retail | 1999 |
| Fundvine Berskshire Asset Management Limited | Financial services | 2024 |
| Fupb Limited | Education | 2026 |
| Furey Tarmac Limited | Construction | 2024 |
| Future Renewables Energy Systems Limited | Construction | 2015 |
| Future Waste Services Ltd | Water & waste | 2017 |
| G C Battery Works Ltd | Wholesale & retail | 2021 |
| G P Electrical & Security Ltd | Construction | 2019 |
| G&F Energy (UK) Ltd | Construction | 2011 |
| G&L Innovations Ltd | Professional & scientific | 2024 |
| G&R Homes Ltd | Real estate | 2017 |
| G. Cathcart Limited | Wholesale & retail | 2004 |
| G. Cutler Kitchens Limited | Manufacturing | 2005 |
| G. Scott Hardware Limited | Wholesale & retail | 2004 |
| G.C.R.J Investments Limited | Real estate | 2018 |
| GA Thompson Ltd | Professional & scientific | 2010 |
| Gallagher Global Migration Ltd | Professional & scientific | 2019 |
| Gallen Developments Limited | Construction | 2015 |
| Gallogley Ltd | Financial services | 2018 |
| Galloon Island Eggs Limited | Agriculture & fishing | 2019 |
| Gallwood Ltd | Construction | 2016 |
| Gamble Cuisine Ltd | Hospitality | 2020 |
| Gardenhill Services Ltd | Professional & scientific | 2024 |
| Garradoney Trading Limited | Hospitality | 2015 |
| Garraroosky Energy Ltd | Real estate | 2023 |
| Garrison & Lough Melvin Anglers Association | Other services | 2013 |
| Garrison Community Group | Education | 2018 |
| Garvary Farms Limited | Agriculture & fishing | 2017 |
| Garvary North West Ltd | Construction | 2021 |
| GAS Iron Ltd | Real estate | 2023 |
| GAV Properties Limited | Professional & scientific | 2004 |
| Gavin Goodman Limited | Extraterritorial | 2024 |
| GC Blandford Ltd | Other services | 2005 |
| GDH Materials Ltd | Extraterritorial | 2022 |
| Geekcorner Ltd | Wholesale & retail | 2025 |
| Genixo Ltd | Wholesale & retail | 2019 |
| GEO Transit NI Limited | Transport & logistics | 2017 |
| Gerald Love Contracts Ltd | Construction | 2016 |
| Gerard & Claire Collins Limited | Agriculture & fishing | 2014 |
| GHG Solutions Services Limited | Financial services | 2024 |
| Gift Plaques UK Ltd | Wholesale & retail | 2018 |
| Gilleece Aviation Services Limited | Transport & logistics | 2011 |
| Gillen Construction Ltd | Construction | 2022 |
| Gilroys Spar Limited | Wholesale & retail | 2026 |
| GKT Services (N.I.) Ltd | Transport & logistics | 2010 |
| Glassdrumman Real Estate UK Ltd | Real estate | 2025 |
| Gleeson Fabrications Limited | Manufacturing | 2019 |
| Glen Engineering Ltd | Manufacturing | 2026 |