| Foyle Eats Limited | Information & communication | 2025 |
| Foyle Skip Hire Limited | Professional & scientific | 2013 |
| Francis Alphonsus Mcnicholl Limited | Extraterritorial | 2024 |
| Freehall Holdings Limited | Real estate | 2025 |
| Friends Forever Europe | Other services | 2010 |
| Frozenbloo Studios Ltd | Information & communication | 2026 |
| FTG Trading Limited | Wholesale & retail | 2017 |
| Fuel Fitness by HM Ltd | Wholesale & retail | 2023 |
| Fuelwise Network Limited | Wholesale & retail | 1998 |
| Full Throttle E-Mx Limited | Wholesale & retail | 2026 |
| Future Expansion NI Ltd | Real estate | 2020 |
| G & a MAC Ltd | Professional & scientific | 2022 |
| G L Installations Ltd | Construction | 2019 |
| G Mclaughlin Drylining Ltd | Construction | 2021 |
| G Neely Construction Ltd | Construction | 2017 |
| G.T. Precision N.I. Ltd | Manufacturing | 2002 |
| Gaelic Gloves Ltd | Wholesale & retail | 2023 |
| Galgorm House Management Company Ltd | Real estate | 2008 |
| Galgorm Mews Management Company Limited | Real estate | 2008 |
| Gared Developments Ltd | Real estate | 2015 |
| Gareths Traditional Fish and Chips Limited | Hospitality | 2017 |
| Garvagh Contracts Limited | Professional & scientific | 2021 |
| Garvagh Development Trust | Other services | 1997 |
| Garvagh Museum Limited | Education | 2002 |
| GAS Property Investments Ltd | Real estate | 2026 |
| GEN IT Solutions Limited | Information & communication | 2025 |
| Gerni NI Ltd | Wholesale & retail | 2021 |
| Ghost Competitions Ltd | Arts & recreation | 2020 |
| Gibson Financial Planning Ltd | Financial services | 2010 |
| Gibsons Healthcare Ltd | Health & social care | 2016 |
| Gillian Ekin People Consultancy Ltd | Professional & scientific | 2023 |
| Gilmore Plumbing Ltd | Construction | 2011 |
| Gimiyala Limited | Manufacturing | 2025 |
| Glade Autos Limited | Wholesale & retail | 2021 |
| Glebe Electrics Limited | Construction | 2018 |
| Glebeview Builders Ltd | Construction | 2021 |
| Glenara Kitchens & Bedrooms Ltd | Manufacturing | 2021 |
| Glenburn View Management Co Ltd | Households | 2021 |
| Glencroft Developments Limited | Real estate | 2003 |
| Glendale Manor Management Company Limited | Extraterritorial | 2014 |
| Glenkeen Holdings Limited | Financial services | 2016 |
| Glenkeen Property & Leisure Ltd | Real estate | 2022 |
| Glenrock Property Management Ltd | Real estate | 2024 |
| Glenshane Road Land Management Ltd | Households | 2006 |
| Glenullin Childcare Trust | Health & social care | 2003 |
| Glenvale Park Management Services Co. Ltd | Households | 2002 |
| Glover Moss Properties Limited | Real estate | 2018 |
| Glovers Lane Management Ltd | Households | 2018 |
| GM5 Properties Ltd | Construction | 2021 |
| GNG Credit Limited | Financial services | 2005 |
| Go Local Roofing & Guttering Ltd | Construction | 2024 |
| Golden Sands Apartments Management Company Limited | Extraterritorial | 2015 |
| Good Line Products Ltd | Wholesale & retail | 2023 |
| Gortfad Electrical Ltd | Construction | 2007 |
| Gortmanor Management Company Limited | Administrative & support | 2016 |
| Gowiththeflowbathrooms Ltd | Construction | 2025 |
| GPM Property Letting & Maintenance Ltd | Real estate | 2024 |
| Gransha Hill Limited | Extraterritorial | 2017 |
| Grasmere Management Services Co. Ltd | Households | 2005 |
| Green Bridge Holdings Limited | Manufacturing | 2018 |
| Green Bridge Property Ltd | Real estate | 2020 |
| Greenan Generation Limited | Energy | 2012 |
| Greenhall Court Management Ltd | Households | 2007 |
| Greenhall Holdings Limited | Financial services | 2025 |
| Greenhall Park Management Limited | Households | 2015 |
| Greenhill Content Ltd | Information & communication | 2024 |
| Greenmount Country Stores Limited | Wholesale & retail | 1992 |
| Greens Foodfare Limited | Extraterritorial | 1988 |
| Greenspot Consulting Limited | Professional & scientific | 2024 |
| Greenwise Consulting Limited | Professional & scientific | 2024 |
| Greystone IP Ltd | Manufacturing | 2017 |
| Gridco (Toomebridge) Ltd | Construction | 2024 |
| Grumpy X Sunshine Ltd. | Wholesale & retail | 2026 |
| GTG Biogas (Toomebridge) Limited | Energy | 2011 |
| Gunrock Capital Limited | Real estate | 2005 |
| Gunrock Estate Management Ltd | Professional & scientific | 2016 |
| Guysmere Trust | Arts & recreation | 2020 |
| H&H (NI) Limited | Hospitality | 2006 |
| H.E. Scott Ltd | Professional & scientific | 2024 |
| Halcom Creative Limited | Professional & scientific | 2025 |
| Hamilton Nursing Home Ltd | Health & social care | 2005 |
| Harbour Left Ltd | Financial services | 2021 |
| Harbour View Management Company (NI) Ltd | Households | 2006 |
| Harella Kitchens Limited | Manufacturing | 2025 |
| Harlow Green Limited | Extraterritorial | 2016 |
| Harpurs Hill Children and Family Centre Limited | Education | 2000 |
| Harte & Eakin (Contractors) Limited | Real estate | 1979 |
| Harvey Hill Contracts Ltd | Construction | 2013 |
| Hastar Limited | Professional & scientific | 2016 |
| Hatherans Management Company Ltd | Real estate | 2016 |
| Haughton's Hall Management Ltd | Extraterritorial | 2016 |
| Hawthorn Developments Limited | Construction | 2023 |
| Hayburn Homes Ltd | Manufacturing | 2012 |
| HB Decorators (NI) Ltd | Construction | 2007 |
| Hbstfxyxgs Limited | Wholesale & retail | 2025 |
| HD7 Ltd | Financial services | 2020 |
| Healing Equines Limited | Extraterritorial | 2020 |
| Health & Safety (Ireland) Limited | Professional & scientific | 2006 |
| Healy Mckeown Architects Ltd | Professional & scientific | 2017 |
| Heathmount Apartments Management Company Ltd | Households | 2010 |