| Glenrea Holdings Ltd | Financial services | 2026 |
| GLM Rural Ltd | Agriculture & fishing | 2026 |
| Global Automation (NI) Ltd | Professional & scientific | 2012 |
| Global SSL Ltd | Wholesale & retail | 2018 |
| Globe Accounts Limited | Professional & scientific | 2018 |
| GMA Bricklaying Ltd | Construction | 2021 |
| GMC Building Contractors Ltd | Construction | 2017 |
| GMC Construction Services Ltd | Construction | 2017 |
| GMC Signs Limited | Manufacturing | 2012 |
| Gmcc Construction Ltd | Construction | 2023 |
| GMG Aluframe Limited | Manufacturing | 2018 |
| GMH Limited | Wholesale & retail | 2009 |
| Go Greener Recycling Limited | Wholesale & retail | 2013 |
| Go Site Services Ltd | Construction | 2019 |
| GOH Lighting Ltd | Construction | 2018 |
| Goland Holdings Ltd | Financial services | 2022 |
| Gold Truck Wash Ltd | Administrative & support | 2022 |
| Golden Bamboo 2026 Ltd | Hospitality | 2026 |
| Golden Bamboo Yang Ltd | Hospitality | 2021 |
| Golden City Coalisland Ltd | Hospitality | 2024 |
| Golden Empire Free Range Eggs Ltd | Agriculture & fishing | 2019 |
| Golden Gate MOY Limited | Hospitality | 2025 |
| Goole Investments Ltd | Households | 2020 |
| Gorestown Garden Products Ltd | Manufacturing | 2018 |
| Gortavoy Feeds & Farm Supplies Ltd | Wholesale & retail | 2002 |
| Gortavoy Taxis Ltd | Transport & logistics | 2022 |
| Gortgonis House Limited | Agriculture & fishing | 2022 |
| Gortmerron Supermarket Limited | Wholesale & retail | 2010 |
| Gortrea Ltd | Real estate | 2015 |
| Gortsannagh Ltd | Professional & scientific | 2021 |
| Gortview Management Company Phase 1 Ltd | Households | 2009 |
| Gortview Management Company Phase 2 Ltd | Households | 2009 |
| Gosford Castle Management (NI) Limited | Households | 2007 |
| GP Developments (NI) LLP | | 2006 |
| GPR Outdoors Ltd | Other services | 2020 |
| GPS GAS Centre Ltd | Wholesale & retail | 2018 |
| Grace Consultancy (NI) Ltd | Professional & scientific | 2014 |
| Gracious Glow Studio Limited | Manufacturing | 2025 |
| Grade-All International Ltd | Manufacturing | 1985 |
| Graham Plastering and Rendering Ltd | Construction | 2026 |
| Graham TPI Ltd | Professional & scientific | 2012 |
| Grange Farm (NI) Limited | Manufacturing | 2012 |
| Granny's Food Ltd | Hospitality | 2017 |
| Granville Ecopark Limited | Water & waste | 2006 |
| Granville Energy Supply Limited | Energy | 2016 |
| Grayson House Interiors Ltd | Wholesale & retail | 2017 |
| Grbg Limited | Construction | 2021 |
| Great Deal (NI) Services Ltd | Wholesale & retail | 2013 |
| Green Fern Farms Ltd | Agriculture & fishing | 2025 |
| Green Power Systems (N.I.) Limited | Manufacturing | 2019 |
| Greenaway Foods (NI) Ltd | Wholesale & retail | 2018 |
| Greenback Holdings Limited | Real estate | 2024 |
| Greenback Trading Limited | Professional & scientific | 2025 |
| Greenbank Holdings Limited | Financial services | 2018 |
| Greendays Horticulture Ltd | Wholesale & retail | 2015 |
| Greenhill Kitchens Limited | Manufacturing | 2003 |
| Greenqube Ltd | Wholesale & retail | 2019 |
| Greenthumb Landscape Solutions Ltd | Professional & scientific | 2022 |
| Greenview Renewables Ltd | Energy | 2022 |
| Greeny Beany Food Ltd | Manufacturing | 2024 |
| Greers Road (DGN) Management Ltd | Real estate | 2009 |
| Gregory Jordan Developments Ltd | Construction | 2019 |
| Greiner Packaging Limited | Manufacturing | 1972 |
| Gribbin Developments Ltd | Construction | 2007 |
| Grind House Coffee Company Ltd | Wholesale & retail | 2021 |
| Grit Advisory Ltd | Professional & scientific | 2024 |
| GRN Contracts Ltd | Construction | 2023 |
| GRN Search Group Ltd | Administrative & support | 2023 |
| GRO Wyrm Ltd | Wholesale & retail | 2024 |
| Grogan Environmental Services Ltd | Water & waste | 2015 |
| Ground Guard Property Maintenance Limited | Construction | 2025 |
| Groundco Consulting & Hire Ltd | Construction | 2019 |
| Grove Electrical & Mechanical Services Ltd | Construction | 2018 |
| Grove Electrical Services Ltd | Construction | 2015 |
| Grovemount Livestock Ltd | Transport & logistics | 2017 |
| Growing Capital Limited | Financial services | 2015 |
| Growmoor Better Growing Ltd | Wholesale & retail | 2019 |
| Growmoor Horticulture Limited | Manufacturing | 2020 |
| Growmoor Property Co Ltd | Real estate | 2020 |
| Growmoor Recycling Ltd | Water & waste | 2012 |
| GT Gasworks Ltd | Professional & scientific | 2012 |
| Gullion Developments Limited | Construction | 2011 |
| Gurufc Holdings Ltd | Financial services | 2022 |
| Gymex Limited | Manufacturing | 2020 |
| H & N Walker Ltd | Construction | 2010 |
| H Gormley & Sons Limited | Construction | 2002 |
| H Mcnamee Civils Ltd | Construction | 2023 |
| H&J (Core Developments) Limited | Construction | 2025 |
| H2 Buildings UK Limited | Manufacturing | 2014 |
| H2 Sheds Ltd | Manufacturing | 2014 |
| Halo Lung Function Ltd | Health & social care | 2024 |
| Hamill Architects Limited | Professional & scientific | 2018 |
| Hamill Farms Ltd | Agriculture & fishing | 2015 |
| Hamilton & Casement Group Ltd | Construction | 2023 |
| Hamilton & Casement Ltd | Construction | 2018 |
| Happy Bums Ltd | Wholesale & retail | 2025 |
| Happy Feet Foot Clinic Limited | Other services | 2012 |
| Happy Minds Therapy Limited | Health & social care | 2021 |
| Happy Nails 03 Ltd | Other services | 2025 |
| Harch Wood Couture Ltd | Manufacturing | 2014 |