| GPB Property Ltd | Real estate | 2013 |
| GPC Livestock & Plant Ltd | Wholesale & retail | 2026 |
| GPG Limited | Wholesale & retail | 2021 |
| GPG O'Hare (Lisburn) Holdings Limited | Administrative & support | 2018 |
| GPG O'Hare (Lisburn) Limited | Administrative & support | 2018 |
| GPM Carpentry Ltd | Construction | 2019 |
| GQ Electrical Services (N.I.) Limited | Construction | 2015 |
| Gracey Shellfish Limited | Wholesale & retail | 2014 |
| Graftridge (Newry) Limited | Wholesale & retail | 2019 |
| Gramac Limited | Hospitality | 2010 |
| Granco Ltd | Wholesale & retail | 2005 |
| Granite & Stone (N.I.) Limited | Manufacturing | 2019 |
| Granite Administration & Marketing Services Ltd | Administrative & support | 1996 |
| Granite Developments NI Ltd | Construction | 2019 |
| Granite Exchange (N.I.) Ltd | Real estate | 2017 |
| Granite Financial Limited | Financial services | 1996 |
| Granite Hill Ltd. | Administrative & support | 2025 |
| Granite Insurance Services Limited | Other services | 1995 |
| Granite Legal Services Limited | Professional & scientific | 2014 |
| Granite Pictures Ltd | Information & communication | 2014 |
| Grant & Sons Transport Limited | Transport & logistics | 2019 |
| Grant & Walsh Bricklaying Services Ltd | Construction | 2018 |
| Grant Automotive Ltd | Wholesale & retail | 2022 |
| Grant Fit OUT (UK) Limited | Construction | 2011 |
| Grant Group Limited | Professional & scientific | 2019 |
| Grant I.T. Solutions Limited | Information & communication | 2018 |
| Grant Plant Ltd | Construction | 2019 |
| Gray Consulting Ltd | Professional & scientific | 2024 |
| Gray's Pubs Limited | Hospitality | 2011 |
| Green Cleen (NI) Limited | Other services | 2007 |
| Green Forwarding LP | | 2017 |
| Green Gables Apartments Management Company Limited | Real estate | 2009 |
| Green Pastures N.I. Limited | Wholesale & retail | 2009 |
| Green Rock Enterprises Ltd | Wholesale & retail | 2026 |
| Green Tiger Recruitment Ltd | Administrative & support | 2024 |
| Green View Trading Ltd | Wholesale & retail | 2018 |
| Green Zone Homes Ltd | Real estate | 2024 |
| Greenan Plumbing Limited | Construction | 2018 |
| Greenans Barbershop Ltd | Other services | 2024 |
| Greenbank Service Station Limited | Wholesale & retail | 2009 |
| Greenbank Wine Lodge Ltd | Wholesale & retail | 2002 |
| Greencastle Farming Limited | Agriculture & fishing | 2025 |
| Greene Duck Ltd | Other services | 2019 |
| Greener Home Living Ardrossan Limited | Real estate | 2015 |
| Greener Home Living Limited | Construction | 2015 |
| Greeneuc Limited | Information & communication | 2025 |
| Greenfield Groundworks Ltd | Construction | 2018 |
| Greenisland Contracts Ltd | Construction | 2023 |
| Greenlane Services Limited | Wholesale & retail | 2003 |
| Greenmaine Mechanical Ltd | Construction | 2025 |
| Greenmond Technics L.P. | | 2015 |
| Greenpark Accountancy Services Limited | Professional & scientific | 2025 |
| Greenpark Energy Systems (NI) Limited | Professional & scientific | 2011 |
| Greenpark Outdoor Pursuits Ltd | Other services | 2022 |
| Greenpark Professional Services Limited | Administrative & support | 2023 |
| Greenrose Enterprises Ltd | | 2001 |
| Greensappire Ltd | Wholesale & retail | 2025 |
| Greentrack Energy Ltd | Energy | 2020 |
| Greenvale Cabins Limited | Hospitality | 2020 |
| Greenvale Horse Transport Limited | Transport & logistics | 2020 |
| Greenwell Mews (186) Management Company Limited | Households | 2009 |
| Gregan Construction Ltd | Construction | 2019 |
| Gregorys Service Station Ltd | Wholesale & retail | 2021 |
| Greyport Universal L.P. | | 2017 |
| Greystone MAX Ltd | Construction | 2025 |
| Gribben Contracts Ltd | Construction | 2023 |
| Griff NI Services Ltd | Wholesale & retail | 2021 |
| Griffin Holdco Limited | Financial services | 2014 |
| Griffin Medical Practice Ltd | Professional & scientific | 2010 |
| Grinan Contracts Ltd | Construction | 2015 |
| Grinan Lough Services Ltd | Manufacturing | 2009 |
| Groove Loops (N.I.) Limited | Information & communication | 2024 |
| Gruppa 909 LP | | 2018 |
| GRÁ Group CIC | Professional & scientific | 2026 |
| GSL Property Services Ltd | Construction | 2024 |
| GTL Tyre Wholesale Ltd | Wholesale & retail | 2019 |
| GTP Property Ltd | Extraterritorial | 2020 |
| GTT Logistics Limited | Transport & logistics | 2019 |
| Guardiam Ltd | Information & communication | 2024 |
| Guiding Light Holdings Limited | Professional & scientific | 2017 |
| Gullion Construction Ltd | Construction | 2022 |
| Gullion Loss Assessors NI Limited | Professional & scientific | 2020 |
| Gullion Media Limited | Information & communication | 1997 |
| Guru Catering Ltd | Hospitality | 2026 |
| GVI Contracts Ltd | Construction | 2007 |
| GVI Design Ltd | Professional & scientific | 2025 |
| GVM Solutions Ltd | Wholesale & retail | 2025 |
| Gwyneth Evans Limited | Wholesale & retail | 2025 |
| Gym Trix Ltd | Arts & recreation | 2020 |
| H & E Enterprises Limited | Real estate | 1994 |
| H & S Grant Contracts Limited | Construction | 2006 |
| H B Contracts Limited | Transport & logistics | 2021 |
| H Collins Transport Ltd | Transport & logistics | 2018 |
| H Mcfaddens Funfairs Limited | Arts & recreation | 2017 |
| H&H Performance Ltd | Arts & recreation | 2020 |
| H&H Properties (N.I) Ltd | Real estate | 2020 |
| H&Hb Holdings Limited | Financial services | 2021 |
| H&M Scalp and Skin Clinic Ltd | Other services | 2024 |
| H.J.C Contracts Ltd | Construction | 2023 |
| H20 Ireland Limited | Construction | 2008 |