| Glentown Group Ltd | Extraterritorial | 2022 |
| Glenturas Construction Limited | Construction | 2013 |
| Glenvar Land and Property Limited | Real estate | 2025 |
| Glenview Construction Limited | Construction | 2026 |
| Glenwood Designs Limited | Manufacturing | 2016 |
| Gloame Consulting Ltd | Professional & scientific | 2026 |
| Global Automation Support Ltd | Construction | 2026 |
| Global Brands Dutyfree Ltd | Administrative & support | 2004 |
| Gloria Jennz Ltd | Wholesale & retail | 2025 |
| Glossy Dhuk Ltd | Other services | 2025 |
| Gmac E & I Limited | Professional & scientific | 2018 |
| Gmac International Transport Ltd | Transport & logistics | 2020 |
| Gmacc Ltd | Construction | 2025 |
| GMC Consultancy Ireland Ltd | Construction | 2023 |
| GMC Plumbing & Heating Ltd | Construction | 2017 |
| GMG Contracts Limited | Construction | 2021 |
| GN Truck & Trailer Spares Ltd | Wholesale & retail | 2015 |
| Go Safe Group Ltd | Transport & logistics | 2023 |
| Godg Limited | Financial services | 2014 |
| Golden Green Leaf Ltd | Health & social care | 2024 |
| Golden Vale (NI) Limited | Wholesale & retail | 1989 |
| Good Food 228 Ltd | Hospitality | 2022 |
| Good Friday Robotics Ltd | Manufacturing | 2020 |
| Gorthill AD Limited | Energy | 2015 |
| Gorthill Energy Limited | Extraterritorial | 2013 |
| Gortilea Social Farm CIC | Health & social care | 2014 |
| Gortnaghey Developments Ltd | Construction | 2017 |
| Gortree Developments Limited | Administrative & support | 1991 |
| Gortree Farm Limited | Agriculture & fishing | 2026 |
| GP Federation Support Unit Western C.I.C. | Administrative & support | 2017 |
| GPR Developments Limited | Real estate | 2021 |
| Graa Reoeg Ltd | Wholesale & retail | 2024 |
| Grab & Go Derry Limited | Hospitality | 2020 |
| Grace Foods Import Ltd | Wholesale & retail | 2024 |
| Granada Radix Ltd | Other services | 2024 |
| Grangemore Properties Ltd | Construction | 2023 |
| Gransha Properties Limited | Real estate | 2024 |
| Grantedge.Ai Limited | Information & communication | 2026 |
| Grantipedia Ltd | Professional & scientific | 2021 |
| Grants Appliances Ltd | Other services | 2019 |
| Graphixni Limited | Manufacturing | 2025 |
| Grastone Ltd | Extraterritorial | 2015 |
| Gravitas Compliance Limited | Professional & scientific | 2016 |
| Gravitas Investment Solutions Limited | Financial services | 2026 |
| Gravity Architects Ltd | Professional & scientific | 2015 |
| Graxam Limited | Real estate | 2013 |
| Gray's Communications Limited | Professional & scientific | 2017 |
| Great Fortune Derry Ltd | Hospitality | 2024 |
| Green Door (N.I.) Ltd | Hospitality | 2022 |
| Green Street Living Ltd | Real estate | 2024 |
| Greenan Enterprises Limited | Construction | 2023 |
| Greenan Properties Limited | Construction | 2023 |
| Greenan Valley MC Limited | Households | 2017 |
| Greencastle Fort Limited | Administrative & support | 2006 |
| Greenwalk Safety Ltd | Professional & scientific | 2026 |
| Greenwood Orthopaedic Referrals Ltd | Professional & scientific | 2025 |
| Greenwyn Ltd | Financial services | 2003 |
| Grey Glade Ltd | Professional & scientific | 2025 |
| GRI Solutions Ltd | Professional & scientific | 2023 |
| Grianan Equipment Hire Limited | Construction | 2025 |
| Grieve Electrics Limited | Energy | 2020 |
| Grofuse Limited | Information & communication | 2017 |
| Grove Theatre Group Limited-The | Arts & recreation | 2002 |
| Grovehall Renewable Services Limited | Energy | 2019 |
| Gryanfba Ltd | Wholesale & retail | 2025 |
| GS Asset Solutions Ltd | Real estate | 2025 |
| GS Cloud Solutions Ltd | Information & communication | 2024 |
| GS Fabrication Ltd | Manufacturing | 2015 |
| GSF Livestock Systems Ltd. | Manufacturing | 2016 |
| GSF Trading Ltd | Wholesale & retail | 2024 |
| GSR Enterprises Ltd | Households | 2018 |
| Gtoaks Ltd | Construction | 2025 |
| Guava Juice Bars Ltd | Wholesale & retail | 2007 |
| Guild House Advisory Services Limited | Professional & scientific | 1970 |
| Gulfstream Boats Limited | Manufacturing | 2013 |
| Gulfstream Marina Limited | Other services | 2023 |
| Guru Fast Food Limited | Hospitality | 2023 |
| GWC Freight Ltd | Transport & logistics | 2014 |
| H & C Construction Services Ltd | Construction | 2019 |
| H & G Contracts Limited | Construction | 2021 |
| H & P Properties (NI) Limited | Real estate | 2014 |
| H Fulton Tractors Ltd | Wholesale & retail | 2025 |
| H&G Estates Limited | Real estate | 2024 |
| H&P Holdings (NI) Ltd | Financial services | 2019 |
| Halfway Estates Limited | Real estate | 2021 |
| Hall Silos Limited | Other services | 1991 |
| Hallmark Real Estate Ltd | Construction | 2009 |
| Halo Holder Limited | Professional & scientific | 2025 |
| Hamilton Properties (Creevagh) Ltd | Real estate | 2025 |
| Handicaddie Ltd | Information & communication | 2020 |
| Hands That Talk | Wholesale & retail | 2003 |
| Hannigan Fish Trading Limited | Wholesale & retail | 2019 |
| Happy Days Childcare Ltd | Health & social care | 2011 |
| Happy Garden (Dungiven) Ltd | Hospitality | 2016 |
| Harbour Mills Limited | Real estate | 2017 |
| Harcourt Projects Ltd | Real estate | 2022 |
| Hard Yards - Scale UP Ltd | Information & communication | 2025 |
| Hardieez Foods Limited | Hospitality | 2024 |
| Harding Haven Ltd | Real estate | 2025 |
| Hardworkworks Ltd | Arts & recreation | 2026 |