| Gfso Ltd | Manufacturing | 1966 |
| GG & MJ Enterprises Ltd | Arts & recreation | 2008 |
| GGD Global (N.I.) Ltd | Construction | 2008 |
| GH Dungannon Ltd | Financial services | 2012 |
| GH Newry Ltd | Arts & recreation | 2012 |
| GH on Course Ltd | Arts & recreation | 2012 |
| Giant Murphy Distilleries Ltd | Extraterritorial | 2011 |
| GIG Grafter Limited | Information & communication | 2016 |
| Giggles Early Years Ltd | Education | 2014 |
| Gilamore Newry Ltd | Hospitality | 2022 |
| Gilmore Auto Services Ltd | Wholesale & retail | 2016 |
| Gilroy Heating Services Ltd | Construction | 2016 |
| Givco Contracts Ltd | Financial services | 2025 |
| Give US Beauty Limited | Wholesale & retail | 2018 |
| Givran Autoparts (Newry) Ltd | Wholesale & retail | 2006 |
| GJK Plumbing & Heating Ltd | Construction | 2023 |
| GL Care LLP | | 2010 |
| GL Property (NI) LLP | | 2013 |
| Glac Power Ltd | Energy | 2014 |
| Glamsy Ltd | Wholesale & retail | 2019 |
| Glanmire Limited | Real estate | 2013 |
| Glasker Court Management Company Limited | Real estate | 2002 |
| Glassdrummond Importers & Exporters Limited | Wholesale & retail | 1986 |
| Glasswater Lodge Retirement Home Limited | Health & social care | 2012 |
| Glebe Capital Limited | Construction | 2021 |
| Glebe House Garden Ltd | Wholesale & retail | 2021 |
| Glen Bridge Management Company Ltd | Households | 2019 |
| Glen Plastic L Ltd | Manufacturing | 2020 |
| Glen Plastics Chpr Ltd | Manufacturing | 2020 |
| Glena Contracts Limited | Wholesale & retail | 2023 |
| Glena Developments Ltd | Construction | 2015 |
| Glenbay | Other services | 1987 |
| Glenburn Fire Solutions Ltd | Professional & scientific | 2025 |
| Glencar Enterprises (NI) Limited | Professional & scientific | 2021 |
| Glencar Management Limited | Households | 2025 |
| Glencar Meadows Management Company Limited | Households | 2015 |
| Glencarron Homes Limited | Other services | 1990 |
| Glencorr Management Company Limited | Households | 2012 |
| Glenlough Properties Limited | Construction | 2021 |
| Glenluce Fishing Co. Limited | Agriculture & fishing | 1985 |
| Glenmarshal Farms Ltd | Transport & logistics | 2014 |
| Glenmarshal Sires (UK) Ltd. | Agriculture & fishing | 2022 |
| Glenmarshal Sires Ltd | Agriculture & fishing | 1996 |
| Glenmore Utilities Limited | Professional & scientific | 2023 |
| Glennco Holdings Limited | Financial services | 2024 |
| Glenpac Bacon Products Limited | Manufacturing | 1998 |
| Glenpac Holdings Limited | Professional & scientific | 2019 |
| Glenpac Trading Limited | Agriculture & fishing | 2022 |
| Glenpatrick Foundation Limited | Health & social care | 2024 |
| Glenvac Ventilation Ltd | Construction | 2023 |
| Glenvale Contracts Ltd | Construction | 2021 |
| Glenvale Granite Ltd | Construction | 2015 |
| Global Animal Services Ltd | Wholesale & retail | 2020 |
| Global Interprises Limited | Wholesale & retail | 2026 |
| Global Tiles & Bathrooms (NI) Ltd | Wholesale & retail | 2013 |
| Global Tiles & Bathrooms Limited | Wholesale & retail | 2009 |
| Gloucester Investments Limited | Other services | 2004 |
| Glovebox Motors Limited | Wholesale & retail | 2022 |
| Glow ME Tanning Ltd | Wholesale & retail | 2026 |
| GM Certified Limited | Public administration | 2024 |
| Gmac Dairies Ltd | Wholesale & retail | 2015 |
| Gmac Formwork Ltd | Construction | 2018 |
| Gmac Joinery Works Limited | Construction | 2015 |
| GMC Developments Limited | Construction | 2003 |
| Gmckeowntransport Limited | Transport & logistics | 2022 |
| Gmcp Limited | Wholesale & retail | 2018 |
| GME Rentals Ltd | Real estate | 2026 |
| GMG Assets Limited | Wholesale & retail | 2022 |
| GMG Building Limited | Construction | 2023 |
| GML Projects L.P. | | 2017 |
| GMM Distribution Ltd | Wholesale & retail | 2025 |
| GMS Glen Maintenance Services Ltd | Manufacturing | 2023 |
| Gmsmc Limited | Professional & scientific | 2021 |
| Gnbn Limited | Other services | 2021 |
| GND Electrix Limited | Construction | 2021 |
| Go & GLO Ltd | Wholesale & retail | 2023 |
| Go Electric (IRL) Ltd | Construction | 2026 |
| Gobbi Ltd | Information & communication | 2025 |
| Golden Dance Awards Ireland Limited | Arts & recreation | 2024 |
| Golden Dance Awards NI Limited | Arts & recreation | 2024 |
| Golden Forest 19 Ltd | Hospitality | 2019 |
| Golden Fortune NI Ltd | Hospitality | 2024 |
| Golden ORB Publications Limited | Professional & scientific | 2011 |
| Goldeneye Cars Limited | Administrative & support | 2022 |
| Goldenstrand Offshore Limited | Agriculture & fishing | 2022 |
| Golf Adventures Ireland Limited | Administrative & support | 2025 |
| Golf Hire Ireland Limited | Administrative & support | 2025 |
| Golf Links House Limited | Hospitality | 2017 |
| Good Choice (N.I.) Ltd | Construction | 2017 |
| Goodwill Plumbing Limited | Construction | 2023 |
| Gordon Automotive Ltd | Wholesale & retail | 2010 |
| Gordon K Hairdressing Ltd | Other services | 2014 |
| Gorman Agri Contracts Ltd | Manufacturing | 2018 |
| Gorse Films Ltd | Information & communication | 2025 |
| GOS Holdings Limited | Real estate | 2016 |
| Goss Caravans Limited | Real estate | 1975 |
| Gourmet Island Ltd | Manufacturing | 2013 |
| Gourmet Kitchen Food Co Ltd | Hospitality | 2020 |
| GP Federation Support Unit Southern C.I.C. | Administrative & support | 2017 |
| GPB Property (1) Ltd | Real estate | 2023 |