| GDH Contracts Ltd | Manufacturing | 2018 |
| GEE LAU Consultants Ltd | Administrative & support | 2023 |
| Geemsee Developments Ltd | Real estate | 2021 |
| Geemsee Properties Ltd | Real estate | 2025 |
| Gelato Cones Ltd | Manufacturing | 2021 |
| Genesis Housing OTI Ltd | Construction | 2023 |
| Geoff Wilson Consultants Ltd | Professional & scientific | 2022 |
| Geopure Group Ltd | Water & waste | 2020 |
| Geopure LLP | | 2016 |
| George Dawson Structural Engineer Ltd | Professional & scientific | 2004 |
| George P.Bell Ltd | Health & social care | 2023 |
| Gepd Services Limited | Extraterritorial | 2009 |
| German Styling Ltd | Wholesale & retail | 2021 |
| GET Better Lurgan Ltd | Wholesale & retail | 2025 |
| Gexito Developments Ltd | Real estate | 2025 |
| Gexito Holdings Ltd | Real estate | 2024 |
| GGT Cleaning Services NI Ltd | Administrative & support | 2026 |
| GHW Consultants Ltd | Health & social care | 2019 |
| Gibson Property Ltd | Real estate | 2025 |
| Giffin Hughes LLP | | 2010 |
| Gilberry Fayre Ltd | Manufacturing | 2015 |
| Gilford Community Regeneration Company | Other services | 2001 |
| Gilford Hydro Ltd | Energy | 2014 |
| Gilford Van Hire Holdings Limited | Financial services | 2025 |
| Gilmour Architects Ltd | Professional & scientific | 2020 |
| Ginger Associates Ltd | Wholesale & retail | 2007 |
| Girls Groupchat Podcast Ltd | Manufacturing | 2025 |
| Gis-It Consultancy Services Limited | Information & communication | 2015 |
| Giving Grace C.I.C. | Wholesale & retail | 2021 |
| GJM Investments Ltd | Real estate | 2025 |
| GJM Retail Consulting Ltd | Professional & scientific | 2024 |
| GL Foods Ltd | Wholesale & retail | 2014 |
| Glamorous Nails and Spa Ltd | Other services | 2026 |
| Glamorous Spa Ltd | Other services | 2026 |
| Glass Partitions (N.I.) Ltd | Construction | 2019 |
| Glass Partitions Ireland Ltd | Construction | 2023 |
| Glassmoss Ltd | Other services | 2018 |
| Glendona Bioenergy Ltd | Energy | 2012 |
| Glenmills Farms Ltd | Agriculture & fishing | 1998 |
| Glenmore Lurgan Management Limited | Households | 2024 |
| Glenn Hilary Ltd | Wholesale & retail | 2020 |
| Glenn Massey Architect Ltd | Professional & scientific | 2010 |
| GLO Design Ltd | Professional & scientific | 2014 |
| Global Cargo Solutions Customs Clearance Limited | Transport & logistics | 2021 |
| Global Livestock Partners Ltd | Wholesale & retail | 2022 |
| Global Ocean Logistics Limited | Transport & logistics | 2022 |
| Global Outreach (UK) Limited | Other services | 1999 |
| Global Route Finder UK Ltd | Professional & scientific | 2024 |
| Global Staff Recruitment Ltd | Administrative & support | 2023 |
| Global Waste Handling Systems Limited | Manufacturing | 2017 |
| Gmax Capital Ltd | Professional & scientific | 2010 |
| GMC Marine Services Ltd | Wholesale & retail | 2024 |
| Gmee Properties Ltd | Real estate | 2026 |
| GMK Construction (NI) Ltd | Construction | 2011 |
| GMK Lettings Ltd | Real estate | 2023 |
| GML Investments Ltd | Real estate | 2024 |
| GMS Intelligent Systems Limited | Information & communication | 2015 |
| Go Fibre Ltd | Information & communication | 2014 |
| Go Klin Care Services Ltd | Health & social care | 2024 |
| Go.Uk (NI) Limited | Wholesale & retail | 2014 |
| Gobbqladraffles Ltd | Arts & recreation | 2025 |
| Golden Chinese Portadown Ltd | Hospitality | 2021 |
| Golden Crust Lurgan Ltd | Manufacturing | 2025 |
| Golden Forest 134 Limited | Hospitality | 2026 |
| Golden Forest Portadown Ltd | Hospitality | 2025 |
| Golden Harvest BT66 Ltd | Hospitality | 2025 |
| Golden Kitchen 2025 Ltd | Hospitality | 2025 |
| Golden Leaf Massage Ltd | Health & social care | 2026 |
| Golden Lough Lurgan Ltd | Hospitality | 2025 |
| Golden Palace Lurgan Ltd | Hospitality | 2023 |
| Golden Treasure Ming Ltd | Hospitality | 2023 |
| Goldstar Coaches Ltd | Transport & logistics | 2014 |
| Golf 24/7 Ltd | Arts & recreation | 2026 |
| Golf Dealer Limited | Extraterritorial | 2005 |
| Good Cheese Productions Ltd | Arts & recreation | 2025 |
| Good Creative Ltd | Professional & scientific | 2024 |
| Gordy's II Ltd | Hospitality | 2019 |
| Gorilla Nutrition Ltd | Manufacturing | 2025 |
| Gort More Holding Ltd | Professional & scientific | 2016 |
| Gosford Storage and Logistics Ltd | Transport & logistics | 2025 |
| GPB Mechanical Engineering Ltd | Construction | 2015 |
| Graeme Malcolm Clarke Limited | Real estate | 2015 |
| Granary Drive Management Limited | Households | 2014 |
| Grangemount Bioservices Ltd | Professional & scientific | 2024 |
| Grani Ltd | Real estate | 2017 |
| Gravity Fellow Ltd | Manufacturing | 2026 |
| GRC Haulage Services Ltd | Transport & logistics | 2023 |
| Green Acre Poultry Consultancy Limited | Agriculture & fishing | 2025 |
| Green Forest Property Ltd | Real estate | 2022 |
| Green Goodness Ltd | Agriculture & fishing | 2025 |
| Green Light Transfers (Armagh) Limited | Other services | 2018 |
| Green Light Transfers Limited | Other services | 2016 |
| Greenacres Construction (NI) Limited | Construction | 2014 |
| Greenisland Flowers Limited | Agriculture & fishing | 2012 |
| Greenmarket International Food Trading (NI) Ltd | Wholesale & retail | 2025 |
| Greenrig Solutions Ltd | Other services | 2016 |
| Greenrock Contracts Ltd | Construction | 2025 |
| Greenrock Renewables Ltd | Construction | 2024 |
| Greg Seeley Consulting Limited | Construction | 2005 |
| Grey Wolf Productions Limited | Information & communication | 2023 |