| Gemni Property Ltd | Real estate | 2025 |
| GEN Tech Specialist Recruitment Solutions Ltd | Administrative & support | 2016 |
| Gen-Sys Consulting Ltd | Information & communication | 2021 |
| Generation X Design Ltd | Wholesale & retail | 2003 |
| Genesis Agri Ltd | Manufacturing | 2019 |
| Genisys Solutions Ltd | Information & communication | 2002 |
| Gentle Imaging Limited | Professional & scientific | 2015 |
| George & Marina Ltd | Hospitality | 2024 |
| George Adams Engineering Limited | Professional & scientific | 2022 |
| George Kennedy Hire Ltd | Construction | 2018 |
| Gerard Mcclinton Estate Agent Ltd | Real estate | 2022 |
| Gerty Holdings Ltd | Real estate | 2023 |
| GES - Green Energy Solutions LLP | | 2022 |
| Getzen Ireland Ltd | Wholesale & retail | 2022 |
| GF Vasc Ltd | Health & social care | 2022 |
| GG NI Properties Ltd | Real estate | 2022 |
| GG Plant Sales Limited | Wholesale & retail | 2019 |
| GGX Holdings Limited | Wholesale & retail | 2025 |
| GH Property Maintenance Services Ltd | Construction | 2022 |
| GHG - Global Holding Group LLP | | 2023 |
| Gilmore Groundworks Ltd | Construction | 2018 |
| Gilmore Marina Limited | Extraterritorial | 2015 |
| GJA Contracts Limited | Construction | 2016 |
| GKM Developments Ltd | Construction | 2015 |
| Gladston Limited | Professional & scientific | 2008 |
| Glamour Dollz Ltd | Other services | 2018 |
| Glas NA Bradan Management Company Limited | Households | 2007 |
| Glass Dolls Ltd | Wholesale & retail | 2023 |
| Glasshouse Vision Ltd | Wholesale & retail | 2025 |
| Glasworx Ltd | Construction | 2017 |
| Glee Goods Limited | Wholesale & retail | 2026 |
| Glen Canopies (N.I.) Limited | Manufacturing | 2021 |
| Glencairn Enterprises Ltd | Professional & scientific | 2019 |
| Glencastle Investments Ltd | Real estate | 2020 |
| Glendoyle Developments Ltd | Construction | 2010 |
| Glenlark Wind Farm Limited | Energy | 2021 |
| Glenn Smyth Vehicle Assessor (NI) Limited | Financial services | 2021 |
| GLM (N.I.) Consultancy Limited | Other services | 2023 |
| GLO Holdings Limited | Professional & scientific | 2018 |
| Global Care Market Company Limited | Wholesale & retail | 2026 |
| Global Distribution Partners Ltd | Wholesale & retail | 2009 |
| Global Energy Medical Services Ltd | Health & social care | 2018 |
| Global Purchase Group LP | | 2023 |
| Globstar Invest LP | | 2020 |
| Gluk Ltd | Wholesale & retail | 2021 |
| GMC 1 Ltd | Real estate | 2025 |
| GMF Buildright Ltd | Construction | 2021 |
| GML Developments Limited | Construction | 2000 |
| GN Media Ltd | Professional & scientific | 2021 |
| Godhay Ltd | Wholesale & retail | 2025 |
| Gold Box Tech Ltd | Extraterritorial | 2023 |
| Gold Performance Solutions Ltd | Professional & scientific | 2023 |
| Golden COD Ltd | Hospitality | 2017 |
| Golden Crescent Group Ltd | Manufacturing | 2026 |
| Golden Garden 2019 Ltd | Hospitality | 2019 |
| Golden Glen Limited | Wholesale & retail | 1992 |
| Golden Harvest Lisburn Ltd | Hospitality | 2023 |
| Goldenbay Holdings Limited | Professional & scientific | 2025 |
| Gorman Group Ltd | Hospitality | 2024 |
| Gortcalley Ltd | Arts & recreation | 2019 |
| Gortwood Properties Ltd | Real estate | 2024 |
| GR8 Fires Limited | Wholesale & retail | 2021 |
| Graham L Property Ltd | Construction | 2026 |
| Grand Pacific Real Estate Limited | Real estate | 2022 |
| Grandview Resources Limited | Professional & scientific | 2021 |
| Gravar Ltd | Wholesale & retail | 2020 |
| Gravity Sales LP | | 2018 |
| Green Aspect Garden Services Ltd | Agriculture & fishing | 2024 |
| Green City Contracts Limited | Construction | 2013 |
| Green Investments Limited | Real estate | 2017 |
| Greenavon Management Company Limited | Households | 2002 |
| Greenburn Electrical Ltd | Construction | 2008 |
| Greenisland Developments Ltd | Construction | 2018 |
| Greenmount Properties Limited | Real estate | 1988 |
| Greens of Lisburn Limited | Wholesale & retail | 2017 |
| Greer Construction Ltd | Construction | 2022 |
| Greer Contracts Ltd | Construction | 2011 |
| Gretmanse Ltd | Wholesale & retail | 2026 |
| Gribben & Watt Financial Planning Limited | Financial services | 2008 |
| Grid Consultors Limited | Professional & scientific | 2020 |
| Ground & Pound Coffee Ltd | Hospitality | 2026 |
| Grounded Earth Ltd | Construction | 2014 |
| Grow Engineering Ltd | Professional & scientific | 2025 |
| GRS Castlereagh Ltd | Real estate | 2022 |
| Gruggandoo Wind Farm Ltd | Energy | 2016 |
| GS Building & Groundworks Ltd | Construction | 2023 |
| GSP Wind Ltd | Manufacturing | 2023 |
| Gtechdl Ltd | Information & communication | 2015 |
| Gtvic Blow DRY Bar Limited | Other services | 2010 |
| Guardian MPS Tech Limited | Information & communication | 2014 |
| GUK Aerospace Ltd | Administrative & support | 2018 |
| GUK Automotive Ltd | Administrative & support | 2018 |
| Gum-Tex Recycling Ltd | Manufacturing | 2021 |
| Gutterjunk Limited | Administrative & support | 2019 |
| Guvin Investments Limited | Real estate | 2014 |
| GW Fuel Systems Ltd | Manufacturing | 2026 |
| GW Joinery Ltd | Manufacturing | 2025 |
| Gwern Ltd | Information & communication | 2019 |
| Gym and Fitness Equipment Ltd | Wholesale & retail | 2020 |
| Gym Rooms NI Ltd | Construction | 2025 |