| Glentoran Recreation Company, Limited | Arts & recreation | 1902 |
| Glentoran Social Partnership | Arts & recreation | 2013 |
| Glenvale Management Company Limited | Households | 2005 |
| Glenvale Properties (N.I.) Ltd | Construction | 2010 |
| Glenview Contracts N. Ireland Limited | Construction | 2019 |
| Glenview Glass and Glazing Limited | Construction | 2026 |
| Glenview Green Energy Limited | Professional & scientific | 2010 |
| Glenview Transport Solutions Ltd | Transport & logistics | 2016 |
| Glenwherry Investments Limited | Real estate | 1969 |
| Glenwood Enterprises Limited | Real estate | 1985 |
| GLG (NI) Limited | Agriculture & fishing | 2012 |
| Glistrr Ltd | Information & communication | 2012 |
| Global Business Design Ltd | Professional & scientific | 2013 |
| Global Caterers Belfast Ltd | Hospitality | 2018 |
| Global CD Group Holdings Ltd | Financial services | 2024 |
| Global Chiropractic (NI) Ltd | Health & social care | 2010 |
| Global Equipment Spares Limited | Manufacturing | 2010 |
| Global Equipment Spares Property Limited | Real estate | 2023 |
| Global Fund for Community Foundations - the | Health & social care | 2009 |
| Global Gateway Ltd | Professional & scientific | 2018 |
| Global Health Connector Limited | Other services | 2025 |
| Global Heartbeat Ltd | Professional & scientific | 2020 |
| Global Inter Office PLC | Construction | 2024 |
| Global IT Communications Service LP | | 2022 |
| Global Management Academy International Ltd | Professional & scientific | 2019 |
| Global Media Distribution LP | | 2017 |
| Global NI Services Limited | Professional & scientific | 2018 |
| Global NRG Advisory Limited | Financial services | 2022 |
| Global Nutrition Value (GNV) Limited | Information & communication | 2026 |
| Global Trade Department (NI) Ltd | Administrative & support | 2024 |
| Global Trading IRL Ltd | Transport & logistics | 2021 |
| Global Trailer Rentals NI Limited | Administrative & support | 2021 |
| Global Wine Distributors Limited | Hospitality | 2013 |
| Globalbridge Commerce Ltd | Wholesale & retail | 2026 |
| Globalecom Ventures Ltd | Financial services | 2024 |
| Globaleire Brands Ltd | Manufacturing | 2016 |
| Globallogic (N.I) Limited | Information & communication | 2021 |
| Globalpass Consultancy Group Limited | Education | 2023 |
| Globance Ltd | Professional & scientific | 2025 |
| Globe Community CIC | Health & social care | 2025 |
| Globe Lighthouse Limited | Professional & scientific | 2016 |
| Globeprospect Limited | Wholesale & retail | 2025 |
| Globespan Group PLC -the | | 1993 |
| Globosure Resources Ltd | Wholesale & retail | 2025 |
| Glofox UK Limited | Information & communication | 2019 |
| Glor NA Mona TEO | Education | 2013 |
| Glorry Trading Ltd | Wholesale & retail | 2023 |
| Glory Bloom Ltd | Wholesale & retail | 2025 |
| Glory Leaf Limited | Wholesale & retail | 2023 |
| Gloucester Street Debt LP | | 2023 |
| Glover Holdings Ltd | Financial services | 2018 |
| Glow UP N.I Ltd | Health & social care | 2025 |
| Glow-Giving Life Opportunities to Women | Other services | 2015 |
| Glowgo KB NI Ltd | Other services | 2026 |
| Glowgroup Ireland Ltd | Education | 2024 |
| Glowmetrics Limited | Information & communication | 2017 |
| GLS Group Ltd | Manufacturing | 2016 |
| Glserenunderetail Ltd | Wholesale & retail | 2024 |
| GLX Recruitment Limited | Administrative & support | 2023 |
| GM 18 GAS Ltd | Construction | 2020 |
| GM Building & Joinery Ltd | Construction | 2017 |
| GM Couriers Ltd | Transport & logistics | 2017 |
| GM Deliveries NI Limited | Transport & logistics | 2025 |
| GM Fitness Equipment Ltd | Wholesale & retail | 2025 |
| GM Knees Ltd | Health & social care | 2019 |
| GM Marketing (Ireland) Limited | Wholesale & retail | 2004 |
| GM Profix Ltd | Manufacturing | 2024 |
| GM Projects and Properties Ltd | Construction | 2025 |
| GM SUB4 Limited | Wholesale & retail | 2021 |
| Gmac Labels Limited | Administrative & support | 2010 |
| Gmad Solutions Limited | Professional & scientific | 2020 |
| Gmax Appliance Care LLP | | 2006 |
| Gmbk Investments Limited | Financial services | 2020 |
| GMC Financial Compliance Solutions NI Ltd | Financial services | 2025 |
| GMC Inns Ltd | Hospitality | 2015 |
| GMC Motor Sales NI Limited | Wholesale & retail | 2026 |
| Gmcb Financial Planning Limited | Professional & scientific | 2024 |
| Gmcg Group Limited | Professional & scientific | 2006 |
| Gmck Epoxy Epoxy Flooring Solutions Limited | Construction | 2023 |
| GMD Pharma Consulting Ltd | Professional & scientific | 2020 |
| GMG Repairs Ltd | Wholesale & retail | 2021 |
| GMK Contracts (Hire) Limited | Administrative & support | 2013 |
| GML Cleaning Ltd | Administrative & support | 2024 |
| GML Electrical Contracts Limited | Construction | 2012 |
| GML Property Maintenance N.I Ltd | Households | 2023 |
| Gmmi Investments Limited | Manufacturing | 2008 |
| GMR Architects Ltd | Professional & scientific | 2011 |
| Gmst Limited | Health & social care | 2024 |
| GMT Wealth Management Limited | Financial services | 2025 |
| Gmtk Properties LLP | | 2012 |
| GMY International Hong Kong Limited | Wholesale & retail | 2025 |
| GN CRN Holdco Limited | Financial services | 2024 |
| GNC - Green Services Limited | Administrative & support | 2025 |
| GNC Catering Ltd | Hospitality | 2025 |
| GNJ Ltd | Health & social care | 2012 |
| GNR Trading Ltd | Wholesale & retail | 2019 |
| GNÓ NA NÓG CIC | Education | 2024 |
| Go Baby Ltd | Wholesale & retail | 2019 |
| Go Box Self Storage Ltd | Transport & logistics | 2015 |
| Go Buyer Ltd | Wholesale & retail | 2018 |