| Glamping in England Ltd | Administrative & support | 2025 |
| Glamping in Ireland Ltd | Administrative & support | 2021 |
| Glamping in Scotland Ltd | Administrative & support | 2025 |
| Glamping in Wales Ltd | Administrative & support | 2025 |
| Glandore View Ltd | Financial services | 2012 |
| Glaneco Ltd | Construction | 2025 |
| Glashygolgan Poultry Ltd | Agriculture & fishing | 2015 |
| Glebe Hire (N.I.) Ltd | Construction | 2016 |
| Glen Carpentry Ltd | Construction | 2017 |
| Glen Construction Consultancy Ltd | Construction | 2024 |
| Glen PIG Farm Ltd | Agriculture & fishing | 2020 |
| Glen Service Stations Limited | Professional & scientific | 2004 |
| Glen Shaw Builders Ltd | Construction | 2018 |
| Glen Valley Properties Limited | Real estate | 2019 |
| Glenalt Farms Limited | Agriculture & fishing | 2016 |
| Glenalt Poultry Ltd | Agriculture & fishing | 2025 |
| Glenbane Stone Ltd | Mining & quarrying | 2011 |
| Glenbrook Farm Ltd | Agriculture & fishing | 2016 |
| Glencam Management Limited | Households | 2017 |
| Glencaring Limited | Health & social care | 2018 |
| Glencaring Services Limited | Health & social care | 2023 |
| Glendale Contracts Ltd | Construction | 2025 |
| Glendennett Ltd | Real estate | 2019 |
| Glenelly Development Trust Limited | Other services | 1991 |
| Glenesk Consultancy (NI) Ltd | Professional & scientific | 2012 |
| Glenform Contracting Limited | Construction | 2014 |
| Glengen Ltd | Energy | 2012 |
| Glenhull Plumbing Services Ltd | Construction | 2023 |
| Glenmore Building Developments Limited | Construction | 2017 |
| Glenpark Estate Ltd | Hospitality | 2020 |
| Glenpark Glamping (RV) Limited | Administrative & support | 2026 |
| Glenpark Glamping Ltd | Hospitality | 2022 |
| Glenside Logistics Limited | Transport & logistics | 2010 |
| Glentimon Real Estate Ltd | Real estate | 2024 |
| Glenview Farm Developments Ltd | Agriculture & fishing | 2026 |
| Glenview Livestock Ltd | Agriculture & fishing | 2012 |
| Glenview Poultry Ltd | Agriculture & fishing | 2025 |
| Global Horizon Skills Ltd | Education | 2007 |
| Global Netcom Services Limited | Professional & scientific | 2006 |
| GM Lining Ltd | Financial services | 2014 |
| GMC Tiling Ltd | Construction | 2026 |
| GMD Plant Hire Ltd | Administrative & support | 2017 |
| GMD Tyre & Service Centre Ltd | Wholesale & retail | 2024 |
| GME Contracts Ltd | Wholesale & retail | 2018 |
| GME Installations Ltd | Construction | 2026 |
| GMG Building Contracts NI Limited | Construction | 2022 |
| GMP Modular Installations Ltd | Construction | 2020 |
| GMW Poultry Ltd | Agriculture & fishing | 2018 |
| Gofer IT Ltd | Information & communication | 2024 |
| Golan Wind Ltd | Energy | 2018 |
| Golfplus Ltd | Wholesale & retail | 2022 |
| Gorman Developments Limited | Mining & quarrying | 2025 |
| Gort Freight Ltd | Transport & logistics | 2025 |
| Gortfinbar Agri Limited | Energy | 2015 |
| Gortglas Holdings Limited | Agriculture & fishing | 2017 |
| Gortin Car Sales & Repairs Ltd | Wholesale & retail | 2023 |
| Gortin Glen Spring Water Ltd | Wholesale & retail | 2021 |
| Gortin Road Accountancy Services Ltd | Professional & scientific | 2009 |
| Gortin Well-Being Collective CIC | Agriculture & fishing | 2022 |
| Gortmore Rental Ltd | Real estate | 2026 |
| Gortnagarn Poultry Ltd | Agriculture & fishing | 2012 |
| Gortrush Food Services Limited | Wholesale & retail | 2006 |
| Gortrush Trading Limited | Wholesale & retail | 2010 |
| Gourmet Vaper Limited | Wholesale & retail | 2024 |
| Governor's House Gaol Square Limited | Construction | 2023 |
| GRA Ultana Ltd | Information & communication | 2016 |
| Grab a Kebab Limited | Hospitality | 2023 |
| Graftwood Holding Limited | Real estate | 2026 |
| Grainger Acoustics Ltd | Professional & scientific | 2015 |
| Granagh Construction Ltd | Real estate | 2014 |
| Graysville Limited | Real estate | 2015 |
| Great Fortune Plumbridge Ltd | Hospitality | 2026 |
| Great Northern Ventures Limited | Agriculture & fishing | 2020 |
| Great Wheels of Fire Limited | Hospitality | 2020 |
| Great Wheels of Fire Pizza Limited | Hospitality | 2025 |
| Green Carbon Chain Limited | Energy | 2021 |
| Green Elves Playgroup | Education | 2002 |
| Green Farm Energy (Ireland) Limited | Energy | 2004 |
| Green Farm Energy (UK) Limited | Energy | 2004 |
| Green Technology and Equipment Ltd | Wholesale & retail | 2024 |
| Green Tyre Enviro Ltd | Water & waste | 2021 |
| Greenan Holdings Ltd | Financial services | 2023 |
| Greenbridge Importers Ltd | Wholesale & retail | 1997 |
| Greencastle Plant Hire Ltd | Wholesale & retail | 2021 |
| Greencastle Rouskey Gortin Concerned Community Limited | Extraterritorial | 2016 |
| Greenhill Pigs | Agriculture & fishing | 2019 |
| Greenleaf Design Ltd | Arts & recreation | 2021 |
| Greenline Electrical Ltd | Construction | 2026 |
| Greenmount Services Ltd | Manufacturing | 2017 |
| Greenville Dairies Ltd | Agriculture & fishing | 2018 |
| Greenville Energy Ltd | Manufacturing | 2010 |
| Grid Utility Services (UK) Ltd | Construction | 2015 |
| Grogan Plant Hire Ltd | Transport & logistics | 2016 |
| Grove Farm Produce Ltd | Agriculture & fishing | 2015 |
| Grovehill Animal Trust | Other services | 2012 |
| Grow Global Group Ltd | Wholesale & retail | 2015 |
| Grugan Rentals Ltd | Administrative & support | 2025 |
| GT Roofing & Cladding Ltd | Construction | 2026 |
| Guidam Consulting Ltd | Health & social care | 2012 |
| Gunpowder & Tweed Ltd | Agriculture & fishing | 2018 |