| Granning Lynx (NI) Ltd | Manufacturing | 1991 |
| Gransha Chase Management Company Limited | Households | 2009 |
| Gransha Dental Limited | Health & social care | 2021 |
| Gransha Road Limited | Hospitality | 2025 |
| Gransha Taxis Ltd | Transport & logistics | 2021 |
| Gransha Wood Management Company Limited | Real estate | 2014 |
| Grant Properties (Belfast) Limited | Real estate | 2015 |
| Grant Thornton (Holdings) NI Limited | Financial services | 2014 |
| Grant Thornton (NI) LLP | | 2014 |
| Grant Thornton Advisors (NI) LLP | | 2024 |
| Grant Thornton Kaizen Limited | Financial services | 2014 |
| Grant Thornton Ventures Limited | Financial services | 2021 |
| Grantgunner Limited | Information & communication | 2026 |
| Grants Garage & Towing Limited | Wholesale & retail | 2023 |
| Grape Sales LP | | 2017 |
| Grapevine Food Ltd | Hospitality | 2009 |
| Graphic & Paper Merchants Northern Ireland Limited | Wholesale & retail | 2015 |
| Graphical Nature Limited | Information & communication | 2015 |
| Grass Machinery NI Limited | Manufacturing | 2025 |
| Grass Roots Harness Racing Limited | Arts & recreation | 2025 |
| Grassgirls Limited | Wholesale & retail | 2025 |
| Grassi Riccardo Ltd | Wholesale & retail | 2025 |
| Grasso Simone Ltd | Wholesale & retail | 2025 |
| Grato Surfaces Ltd | Wholesale & retail | 2025 |
| Gratsi Ltd | Information & communication | 2020 |
| Gravity Zero Ltd | Information & communication | 2020 |
| Gray + Press Accountants Limited | Professional & scientific | 2020 |
| Gray Bullock & Press Group Limited | Professional & scientific | 2022 |
| Gray Fruits Limited | Wholesale & retail | 2024 |
| Gray Space Consulting Ltd | Professional & scientific | 2021 |
| Grayburst Limited | Information & communication | 2026 |
| Grayrock Management Company Limited | Households | 2013 |
| Grayrock Phase 2 Management Company Limited | Households | 2019 |
| Grayrock Phase 3 Management Company Limited | Households | 2024 |
| Grayson Catering Ltd | Hospitality | 2017 |
| Grayson Gaffs Ltd | Real estate | 2023 |
| Grazeni LLP | | 2013 |
| Grby Ltd | Financial services | 2022 |
| GRC Motorcycles Ltd | Wholesale & retail | 2016 |
| Greamason Ltd | Wholesale & retail | 2026 |
| Great Creatio LP | | 2022 |
| Great Locations Management Co Ltd | Extraterritorial | 2016 |
| Great Northern Stores Limited | Wholesale & retail | 2023 |
| Greater Shankill Alternatives Limited | Health & social care | 1998 |
| Greater Shankill Development Agency | | 1989 |
| Greater Shankill Partnership | Other services | 1995 |
| Greater Shankill Partnership Property Development Co. Limited | Real estate | 1997 |
| Greateruo Ltd | Wholesale & retail | 2026 |
| Greatman Technology L.P. | | 2018 |
| Greco Lorenzo Ltd | Wholesale & retail | 2025 |
| Green Accounts Limited | Wholesale & retail | 2013 |
| Green AI North Ltd | Information & communication | 2025 |
| Green Apple Trading Limited | Hospitality | 2026 |
| Green BIO Generation Limited | Energy | 2016 |
| Green BIO Refinery Limited | Energy | 2016 |
| Green Bridge Plumbing Ltd | Administrative & support | 2026 |
| Green Cleaning Collective Ltd | Information & communication | 2014 |
| Green Crocus Ltd | Real estate | 2014 |
| Green Cross Belfast Limited | Wholesale & retail | 2004 |
| Green Deli Ltd | Hospitality | 2024 |
| Green Door Limited | Construction | 1998 |
| Green Energy Finance (UK) Ltd | Professional & scientific | 2013 |
| Green Energy Technology Ltd | Administrative & support | 2009 |
| Green Field Marketing Solutions | Administrative & support | 1999 |
| Green Future (NI) Limited | Wholesale & retail | 2011 |
| Green Giant Tree Surgery Limited | Other services | 2023 |
| Green Harmony Limited | Wholesale & retail | 2024 |
| Green Lane Customs Limited | Transport & logistics | 2025 |
| Green Lane Entertainment Limited | Arts & recreation | 2014 |
| Green Lane Management Annadale Limited | Extraterritorial | 2016 |
| Green Light Dance Company CIC | Education | 2021 |
| Green Michael Ltd | Wholesale & retail | 2023 |
| Green Nature Choice Limited | Administrative & support | 2024 |
| Green Ormeau Limited | Real estate | 2019 |
| Green Park Films (Middletown) Limited | Information & communication | 2005 |
| Green Park Films Limited | Information & communication | 1998 |
| Green Plum LI Ltd | Wholesale & retail | 2024 |
| Green Plus Media Ltd | Professional & scientific | 2026 |
| Green Road Apartments Company Limited | Households | 2010 |
| Green Road Properties Limited | Real estate | 2011 |
| Green Room Productions NI | Arts & recreation | 2022 |
| Green Shoot Productions | Arts & recreation | 2002 |
| Green Tides CIC | Wholesale & retail | 2025 |
| Green Water (NI) Limited | Extraterritorial | 2012 |
| GREEN17 Creative Ltd | Information & communication | 2015 |
| Greenacre Composting Enterprises Ltd | Agriculture & fishing | 2003 |
| Greenacres Properties Limited | Real estate | 2006 |
| Greenburn River Mews Management Company Limited | Households | 2006 |
| Greencastle Belfast Ltd | Hospitality | 2015 |
| Greencastle Pharmacy Ltd | Wholesale & retail | 2018 |
| Greenedge Management Company Limited | Households | 2000 |
| Greenergen Limited | Professional & scientific | 2025 |
| Greenfield Acres Ltd | Construction | 2019 |
| Greenfields Ireland Group Limited | Wholesale & retail | 2022 |
| Greenfields Ireland Holdings Limited | Wholesale & retail | 2012 |
| Greenfields Ireland Limited | Wholesale & retail | 1992 |
| Greenglasses Trading Ltd | Hospitality | 2015 |
| Greengraves Gate Management Company Limited | Extraterritorial | 2017 |
| Greengro Limited | Professional & scientific | 2015 |
| Greenisland Catering Limited | Hospitality | 2018 |