| Foyle Services Limited | Financial services | 2018 |
| Foyle Sheet Metal Limited | Manufacturing | 2010 |
| Foyle Storage Services Ltd | Transport & logistics | 2019 |
| Foyle Supply Company Ltd | Wholesale & retail | 2025 |
| Foyle Valet Centre Ltd | Other services | 2023 |
| Foyle View Builders Limited | Construction | 1977 |
| Foyle Wholesale Limited | Wholesale & retail | 1981 |
| Foyleside Supplies Limited | Construction | 2012 |
| Foyleside Ventures Limited | Households | 2025 |
| Foyleview Contracts Limited | Construction | 2023 |
| Foyleview Pest Control Ltd | Administrative & support | 2023 |
| Foyleview Stays Limited | Hospitality | 2026 |
| FPM Electrical Ltd | Construction | 2014 |
| Frank Donaghy (Auctioneers) Limited | Other services | 2007 |
| Free to List Limited | Information & communication | 2025 |
| Fresh & Clean N.I. Ltd | Administrative & support | 2025 |
| Friends of Ardavon | Health & social care | 1988 |
| FRL Holdco Limited | Hospitality | 2023 |
| Front Line Equipment Ltd | Wholesale & retail | 2025 |
| Frontline Logistics Group NW Ltd | Professional & scientific | 2025 |
| Fuel Logistics Ltd | Transport & logistics | 2009 |
| Fusion Motor Control Ltd | Manufacturing | 2026 |
| Future Agri Tech Ltd | Manufacturing | 2024 |
| Future Style Cosmetics Ltd | Wholesale & retail | 2026 |
| Futureproof Sales Ltd | Administrative & support | 2023 |
| G & D Interior Systems Ltd | Construction | 2013 |
| G & S Brothers Limited | Hospitality | 2021 |
| G Conaty Electrical Ltd | Construction | 2015 |
| G Mullan & Sons Ltd | Construction | 2017 |
| G Mullan Contracts Ltd | Construction | 2004 |
| G&M Supply & Maintenance Limited | Construction | 2014 |
| G&N Callaghan Ltd | Real estate | 2025 |
| G. a. Parke & Sons Limited | Administrative & support | 1985 |
| Gaelforce Logistics Ltd | Transport & logistics | 2026 |
| Gaffer AI Limited | Information & communication | 2026 |
| Gala Marquees Ltd | Administrative & support | 2012 |
| Galaxite Ltd | Information & communication | 2018 |
| Galdoy GFA Ltd | Wholesale & retail | 2023 |
| Gallagher & MC Kinney Limited | Manufacturing | 2006 |
| Gallagher Cars Limited | Wholesale & retail | 2022 |
| Gallagher Marine Consultants Ltd | Professional & scientific | 2025 |
| Gallagher Retail Limited | Wholesale & retail | 2025 |
| Gallagher Travel Limited | Administrative & support | 1991 |
| Galtur Limited | Financial services | 2023 |
| Gamble Engineering NI Limited | Professional & scientific | 2025 |
| Garden Square Management Ltd | Real estate | 2017 |
| Garlena Properties Limited | Financial services | 2007 |
| Garona Legacy Limited | Administrative & support | 2025 |
| GAS Yard Wall Feile Limited | Arts & recreation | 1996 |
| Gaslight Media Trust | Education | 2007 |
| Gasyard Development Trust | Arts & recreation | 1996 |
| Gaza Restaurant Ltd | Hospitality | 2025 |
| GB Engineering (N.I.) Limited | Manufacturing | 2019 |
| GC Stunts Ltd | Information & communication | 2017 |
| Gcderrycontracts Limited | Construction | 2019 |
| GCH NI. Ltd | Real estate | 2017 |
| Gcjb Ltd | Extraterritorial | 2015 |
| GCS Derry Ltd | Wholesale & retail | 2024 |
| GDK (Derry) Limited | Manufacturing | 2013 |
| GDK Management Ltd | Real estate | 2018 |
| Geely Reason Ltd | Wholesale & retail | 2023 |
| Gelvin Area Community Association Limited | Real estate | 1999 |
| Gelvin Construction Ltd | Manufacturing | 1997 |
| Gelvin Hydro Limited | Energy | 2013 |
| Gemini Electrical & Security Services Ltd | Other services | 2004 |
| Gems Maintenance Services Limited | Construction | 2016 |
| General Engineering Maintenance Services Ltd | Professional & scientific | 2008 |
| Gents Turkish Barbers Derry Ltd | Other services | 2024 |
| George 249 Ltd | Wholesale & retail | 2023 |
| George Doherty (Construction) Limited | Construction | 1988 |
| Gerius Contracts Ltd | Construction | 2008 |
| Gfeller Specialist Joinery Ltd | Manufacturing | 2017 |
| Ghanaian Community NI Ltd | Other services | 2025 |
| Gigtu Limited | Real estate | 2025 |
| Gill Quarries Ltd | Mining & quarrying | 2018 |
| Gillen Fuels Limited | Wholesale & retail | 2005 |
| Gills Newsagent Ltd | Wholesale & retail | 2007 |
| Gimme Goodies Limited | Hospitality | 2022 |
| Ginnis Estates Limited | Financial services | 2024 |
| Ginnis Properties Limited | Construction | 1995 |
| Ginnlear Acquisition Limited | Financial services | 2016 |
| Ginnlear Holdings Limited | Financial services | 2016 |
| Gladeon Ltd | Construction | 2025 |
| Glen-Conn Construction Ltd | Construction | 2020 |
| Glen-Conn Consulting Ltd | Professional & scientific | 2024 |
| Glenaden Developments Ltd | Construction | 2025 |
| Glenaden Investments Limited | Financial services | 2019 |
| Glenanaar Technologies (N.I.) Limited | Information & communication | 2013 |
| Glenardyl Properties Limited | Real estate | 2013 |
| Glenconway Investments Limited | Construction | 2021 |
| Glendara Developments Ltd | Real estate | 2014 |
| Glendermott House Limited | Hospitality | 2012 |
| Glendermott Limited | Extraterritorial | 1985 |
| Glendermott Universal Safety & Hygiene Limited | Wholesale & retail | 2002 |
| Glenkeen Furnishings Ltd | Wholesale & retail | 2010 |
| Glenlough Ltd | Transport & logistics | 2024 |
| Glenshane Electrical Ltd | Construction | 2025 |
| Glenshane Films Limited | Professional & scientific | 1997 |
| Glenshane Ltd | Financial services | 2018 |
| Glenside Consultancy Limited | Professional & scientific | 2021 |