| Greenlight GAS Limited | Construction | 2018 |
| Greenlight N.I. Limited | Information & communication | 2009 |
| Greenmedia 2024 Ltd | Wholesale & retail | 2024 |
| Greenmill Management Company Limited | Households | 2000 |
| Greenmount Guest Accomodation Ltd | Hospitality | 2024 |
| Greenmount Investments Limited | Professional & scientific | 2007 |
| Greenpark Management Company (Rostrevor) Limited | Extraterritorial | 2002 |
| Greenpub Holdings Limited | Hospitality | 2026 |
| Greenpub Trading Limited | Hospitality | 2026 |
| Greens Chemists | Extraterritorial | 1970 |
| Greens Shop Limited | Real estate | 2023 |
| Greensparks Electrical (Ireland) Ltd | Construction | 2017 |
| Greentechenv Ltd | Administrative & support | 2020 |
| Greenthink Hot Limited | Wholesale & retail | 2025 |
| Greenvale Park Management Limited | Extraterritorial | 2003 |
| Greenville IDC Limited | Wholesale & retail | 1979 |
| Greenwell Holdings N.I Ltd | Real estate | 2024 |
| Greenwlch Leisure Limited | Other services | 2019 |
| Greenwood 68 Limited | Real estate | 2022 |
| Greenwood Joinery (N.I.) Limited | Construction | 2017 |
| Greenwood Prestige Mechanics Ltd | Wholesale & retail | 2025 |
| Greenwood Specialist Dental Clinic Limited | Health & social care | 2021 |
| Greer Mcquillan LLP | | 2024 |
| Greer Tiling Ltd | Construction | 2014 |
| Greer's Accident Management Ltd | Wholesale & retail | 2024 |
| Greer's Recovery Services Ltd | Other services | 2021 |
| Greet Dream Ltd | Wholesale & retail | 2023 |
| Gregg's Quay Management Company Limited | Households | 1998 |
| Gregory Architects Ltd | Professional & scientific | 2013 |
| Gregory by the Warren Collection Ltd | Hospitality | 2022 |
| Gremlin LAB Ltd | Wholesale & retail | 2021 |
| Grent Trust Limited | Professional & scientific | 1979 |
| Grenville Properties NI Ltd | Real estate | 2023 |
| Gresham Enterprises Ltd | Real estate | 2023 |
| Gresham IND Limited | Wholesale & retail | 2019 |
| Greyberg Trade L.P. | | 2017 |
| Greypoint Ltd | Real estate | 2013 |
| Gricol Properties Ltd | Real estate | 2024 |
| Gricol Pubs Ltd | Hospitality | 2024 |
| Gridline Facades (Ireland) Ltd | Construction | 2020 |
| Gridline Facades Ltd | Construction | 2013 |
| Griffin College Limited | Education | 2012 |
| Grill'D Ltd | Hospitality | 2018 |
| Grillgo BBQ Limited | Hospitality | 2025 |
| Grimes Marine Services Limited | Transport & logistics | 2026 |
| Grimm Pictures Ltd | Information & communication | 2022 |
| Grindtec Services Limited | Wholesale & retail | 2020 |
| GRM Estates (NO 1) Limited | Financial services | 2022 |
| Groening Developments Limited | Construction | 2017 |
| Groeuro Limited | Professional & scientific | 2021 |
| Grofect LP | | 2021 |
| Grokr Software Ltd | Information & communication | 2024 |
| Groovers Entertainment Ltd | Information & communication | 2022 |
| Groph Ltd | Health & social care | 2023 |
| Groscon Ltd | Information & communication | 2019 |
| Grosvenor Health Care Ltd | Extraterritorial | 1998 |
| Ground Rent Management Limited | Other services | 2002 |
| Ground Truth Solutions Ltd | Information & communication | 2025 |
| Grounded Belfast Limited | Administrative & support | 2024 |
| Group Atelier Ltd | Hospitality | 2026 |
| Grove Agri Ltd | Manufacturing | 2019 |
| Groves Pharmacy Limited | Wholesale & retail | 2014 |
| Grow Light Powers Ltd | Wholesale & retail | 2024 |
| Grow Local Engine Ltd | Professional & scientific | 2026 |
| Grow to Go EV Coleraine Ltd | Financial services | 2024 |
| Grow Web Ltd | Professional & scientific | 2019 |
| Grow-Ni | Education | 2016 |
| Growflo Ltd | Information & communication | 2023 |
| Growth Finance Fund General Partner Limited | Financial services | 2018 |
| Growth Finance Fund LP | | 2018 |
| Growth Industries Limited | Professional & scientific | 2018 |
| Growth Industries Pharmaceuticals Ltd | Health & social care | 2022 |
| Grubbler Limited | Information & communication | 2023 |
| Gruig Wind Farm Limited | Professional & scientific | 2006 |
| GRÁ Matcha Ltd | Wholesale & retail | 2024 |
| GS Ventures (Antrim) Ltd | Hospitality | 2024 |
| GS Ventures (Bangor) Limited | Hospitality | 2025 |
| GS Ventures (EB) Ltd | Hospitality | 2024 |
| GS Ventures (N.I.) Ltd | Hospitality | 2021 |
| GS Ventures (SB) Ltd | Hospitality | 2024 |
| GS Ventures (WB) Ltd | Hospitality | 2024 |
| Gsbn Metalworks Ltd | Professional & scientific | 2022 |
| Gsdl Limited | Real estate | 2018 |
| GSG Atlantic Limited | Professional & scientific | 2011 |
| GSJ 1959 | Professional & scientific | 2008 |
| Gsma Construction Limited | Construction | 2024 |
| Gsmac Lifting Ltd | Construction | 2021 |
| Gszkmp Ltd | Wholesale & retail | 2024 |
| GT Golf Sales Northern Ireland Limited | Wholesale & retail | 2015 |
| GT Logistics Ltd | Transport & logistics | 2020 |
| GTD Recruitment Services Limited | Administrative & support | 2025 |
| GTM Relocations Ltd. | Transport & logistics | 2012 |
| Gtown Ltd | Construction | 2021 |
| Guangzhou Tengyun Communication Equipment Co Ltd | Wholesale & retail | 2025 |
| Guangzhou Wobolun Trading Ltd | Wholesale & retail | 2026 |
| GUARDIAN24 Limited | Information & communication | 1998 |
| Guardians of Old Ltd | Wholesale & retail | 2025 |
| Guardians of the Flame Ltd | Information & communication | 2019 |
| Gubay Bulk Limited | Wholesale & retail | 2025 |
| Gubery Ltd | Wholesale & retail | 2026 |