| Flutters Portrush Limited | Arts & recreation | 2006 |
| FLY BOY Pizza Ltd | Hospitality | 2024 |
| FO Housing Ltd | Real estate | 2019 |
| Fonz FIX4U Limited | Wholesale & retail | 2022 |
| Food Guru T/A Apache Pizza Ltd | Hospitality | 2024 |
| Food of the Earth Ltd | Manufacturing | 2022 |
| Food Process Limited | Professional & scientific | 2020 |
| Forest Park Ground Care Limited | Water & waste | 2021 |
| Forest View Farms Ltd | Agriculture & fishing | 2017 |
| Forestview Organic Mushrooms Ltd | Agriculture & fishing | 2020 |
| Forge Engineering Services Ltd | Manufacturing | 2007 |
| Forged Composites Ltd | Manufacturing | 2025 |
| Fortixpay Ltd | Professional & scientific | 2025 |
| Four Seasons Boutique Ltd | Wholesale & retail | 2010 |
| Fourwinds Estates Limited | Real estate | 2025 |
| FOX (K) Fabrications Ltd | Construction | 2026 |
| FOX Integrated Power Services Limited | Construction | 2017 |
| FOX Poultry Limited | Agriculture & fishing | 2014 |
| Foxborough Holdings Ltd | Information & communication | 2022 |
| FP DEV Ltd | Construction | 2019 |
| Fpffm Holdings Ltd | Financial services | 2023 |
| Fpffm Ltd | Wholesale & retail | 2015 |
| Fpffm Property Ltd | Real estate | 2023 |
| Francis Neill Motors (Annaghmore) Limited | Wholesale & retail | 1976 |
| Frank Gallagher & Sons Limited | Construction | 2007 |
| Franklin Distribution Ltd | Wholesale & retail | 2023 |
| Frazer House Ltd | Households | 1996 |
| Fresh Dimension Foods Ltd | Manufacturing | 2016 |
| Frew Business Machines Limited | Administrative & support | 1999 |
| Frizelle Fabrication Limited | Manufacturing | 2019 |
| Frizelle Holdings Ltd | Financial services | 2026 |
| Frontier Energy Solutions Ltd | Professional & scientific | 2009 |
| Furniture Next Day Ltd | Wholesale & retail | 2018 |
| Fuse Pipeline Ltd | Professional & scientific | 2020 |
| FXL Executive Solutions Ltd | Professional & scientific | 2014 |
| G & a O'Neill Ltd | Agriculture & fishing | 2026 |
| G and S Donnelly Limited | Agriculture & fishing | 2003 |
| G B Property (N.I.) Limited | Real estate | 2018 |
| G Muldoon International Transport Ltd | Transport & logistics | 2024 |
| G-Tec Dispense Services Ltd | Extraterritorial | 2012 |
| Gables Hospitality Ltd | Hospitality | 2025 |
| Galabake Manufacturing Limited | Wholesale & retail | 2010 |
| Galbally Youth & Community Association | Arts & recreation | 1994 |
| Gale Force Designs Limited | Manufacturing | 2018 |
| Gallion Developments Limited | Construction | 2016 |
| Gallion Property Management Limited | Real estate | 2017 |
| Gameland Ltd | Arts & recreation | 2025 |
| Gardengears Ltd | Wholesale & retail | 2026 |
| Gardiner Stinson Limited | Wholesale & retail | 1991 |
| Garvagh Construction Ltd | Construction | 2024 |
| Garvagh Energy Supply Limited | Energy | 2013 |
| Garvagh Finance Ltd | Financial services | 2020 |
| Garvagh Investments Limited | Real estate | 2013 |
| Garvagh Property Management Ltd | Real estate | 2020 |
| Gaurdex Global Consultancy Ltd | Administrative & support | 2026 |
| GC Investments Ireland Ltd | Real estate | 2024 |
| GCG Properties Limited | Real estate | 2010 |
| Gdpm Consulting Ltd | Information & communication | 2023 |
| Geco Holdco Ltd | Financial services | 2019 |
| Geda Construction Company Limited | Construction | 1982 |
| Geda Holdings Limited | Construction | 2019 |
| Geda Homes Ltd | Construction | 2025 |
| Geda Limited | Construction | 2025 |
| Geda WSI JV Ltd | Construction | 2020 |
| General Cabins & Engineering Ltd | Manufacturing | 2002 |
| General Painting Services Ltd | Construction | 2024 |
| Genesis Fine Arts (NI) Limited | Wholesale & retail | 2019 |
| Geno Property Ltd | Real estate | 2016 |
| Gentle Sole Reflexology Limited | Health & social care | 2021 |
| Geo-Minerals GT Limited | Extraterritorial | 2009 |
| Geomite Minerals Limited | Mining & quarrying | 2021 |
| Gerard Daly & Co. Chartered Accountants Limited | Professional & scientific | 2022 |
| Gerry Mcveigh Services Ltd | Wholesale & retail | 2022 |
| Geshon Limited | Information & communication | 2024 |
| GFA Distribution Ltd | Transport & logistics | 2019 |
| GFS Joinery Limited | Information & communication | 2015 |
| GGG Depot Ltd | Wholesale & retail | 2018 |
| GIG (NI) Ltd | Real estate | 2014 |
| Gigs (Ireland) Ltd | Real estate | 2016 |
| Gilbert Law & Co Investigators Limited | Administrative & support | 2003 |
| Gildernew & Co. Ltd | Professional & scientific | 2016 |
| Gill Print Ltd | Manufacturing | 2021 |
| Gillespie Roofing & Joinery Limited | Construction | 2019 |
| Girls Life Ministries | Construction | 2022 |
| Givan Bros Limited | Agriculture & fishing | 2019 |
| GJO Construction Ltd | Construction | 2016 |
| GJO Contracts Ltd | Construction | 2025 |
| Gleana Solutions Limited | Professional & scientific | 2020 |
| Glebe Doors Limited | Wholesale & retail | 2015 |
| Glebe Farm Livestock Ltd | Wholesale & retail | 2023 |
| Glenavon Avenue Open Space Management Company Ltd | Households | 2025 |
| Glenbeg Limited | Professional & scientific | 2014 |
| Glencon Transport Ltd | Transport & logistics | 2024 |
| Glendun Plant Sales Limited | Wholesale & retail | 2014 |
| Glenelly Investments Limited | Real estate | 2005 |
| Glenfort Timber Engineering Limited | Construction | 2010 |
| Glenholm Poultry Limited | Agriculture & fishing | 2016 |
| Glenmills Contracts Ltd | Construction | 2024 |
| Glenmore Poultry Limited | Agriculture & fishing | 2011 |
| Glenrea Farms Limited | Agriculture & fishing | 2013 |