| Ggib Ltd | Health & social care | 2025 |
| Ggkc Services Limited | Real estate | 2024 |
| GGS Capital Limited | Financial services | 2021 |
| GH (Belfast) Ltd | Administrative & support | 2020 |
| GH Engineering (N.I.) Ltd | Extraterritorial | 2026 |
| Gh&Rl Properties Ltd | Real estate | 2021 |
| Gharion Properties Ltd | Real estate | 2020 |
| Ghbarnaby Ltd. | Information & communication | 2017 |
| Gheng Enterprises Ltd | Extraterritorial | 2026 |
| Ghhdqx Limited | Wholesale & retail | 2024 |
| Ghitts Limited | Wholesale & retail | 2023 |
| GHL (Lisburn NI 2) Limited | Construction | 2016 |
| GHL (Lisburn NI) Limited | Construction | 2016 |
| Ghulam Qadir Khan Ltd | Health & social care | 2022 |
| GI2 Promotions Ltd | Wholesale & retail | 2024 |
| Giandel PTY Ltd | Wholesale & retail | 2025 |
| Gianluca&Daves Ltd | Hospitality | 2020 |
| Giant Goose Limited | Wholesale & retail | 2023 |
| Giant Property Limited | Real estate | 2012 |
| Giantron Technologies Corporation Limited | Wholesale & retail | 2023 |
| Giants Causeway Tours Ltd | Administrative & support | 2022 |
| Giants Info Systems Ltd | Information & communication | 2024 |
| Giants Park Belfast Environmental Limited | Construction | 2023 |
| Giants Park Belfast Limited | Construction | 2018 |
| Gibb Technology Limited | Information & communication | 2025 |
| Gibbons & Law LLP | | 2024 |
| Gibbs Engineering (Technical Services) Limited | | 2000 |
| Gibson Family Holdings Ltd | Financial services | 2022 |
| Gibson Hallmark Limited | Professional & scientific | 2003 |
| Gibson Property (N.I.) Ltd | Construction | 2018 |
| Gibson Transport and Storage Limited | Transport & logistics | 2016 |
| Gieefse Ltd | Other services | 2025 |
| Giftura Limited | Information & communication | 2025 |
| Giga Training Ltd | Education | 2011 |
| Gigi's Cottages NI Ltd | Hospitality | 2026 |
| Gilbert-Ash Fitout Limited | Extraterritorial | 1976 |
| Gilbert-Ash Holdings Limited | Financial services | 2018 |
| Gilbert-Ash Limited | Construction | 1947 |
| Gilchrist & Co (CA) Ltd | Professional & scientific | 2015 |
| Gilchrist & Co (NI) LLP | | 2007 |
| Giles Glass Ltd | Wholesale & retail | 2025 |
| Gill Hall Farms Limited | Agriculture & fishing | 2015 |
| Gill Hall Smithworks Limited | Construction | 2017 |
| Gillaroo Lodge Nursing Home Limited | Health & social care | 1988 |
| Gillen Contracts Ltd | Construction | 2022 |
| Gillen Properties Ltd | Construction | 2015 |
| Gillespie Store Management Company Ltd | Households | 2024 |
| Gillhall Leisure Limited | Administrative & support | 2018 |
| Gillian Mckee Limited | Wholesale & retail | 1998 |
| Gillian Thompson Ltd | Education | 2019 |
| Gilligan & Partners Limited | Construction | 2003 |
| Gilligan (N.I.) Limited | Construction | 2019 |
| Gilligan Investments Limited | Financial services | 2026 |
| Gilmore Health & Safety Ltd | Other services | 2025 |
| Gilmore Services Limited | Administrative & support | 2006 |
| Gilmour Inns Ltd | Hospitality | 1998 |
| Gilnahirk Developments Limited | Real estate | 2017 |
| Gilnahirk Management Company Limited | Households | 1987 |
| Gilnahirk Properties Limited | Real estate | 2024 |
| Gilnahirk Tuning Limited | Wholesale & retail | 2026 |
| Gilnahirk Tyres & Exhausts Limited | Wholesale & retail | 2003 |
| Gilpinstown Limited | Construction | 2013 |
| Gilta Limited | Hospitality | 1996 |
| Gilzean Properties Limited | Real estate | 2005 |
| Gimme Golf Ltd | Wholesale & retail | 2026 |
| Ginato Italia Limited | Wholesale & retail | 2020 |
| Ginger Garlic Ltd | Hospitality | 2020 |
| Gino Lynch Film Ltd | Information & communication | 2016 |
| Ginsencha Ltd | Wholesale & retail | 2023 |
| Giovanna Concept Limited | Manufacturing | 2015 |
| Girdwood Community Trust | Health & social care | 2015 |
| Girland Healthcare Services Ltd | Administrative & support | 2023 |
| Girmito Ltd | Wholesale & retail | 2025 |
| Girona Consulting Limited | Professional & scientific | 2025 |
| Girona Developments Limited | Extraterritorial | 2002 |
| Give Back (NI) | Administrative & support | 2017 |
| GJ & C Campbell Ltd | Real estate | 2019 |
| GJ Fitzpatrick & Co Ltd | Wholesale & retail | 2024 |
| GJB Property Limited | Real estate | 2017 |
| GJD Restaurants Ltd | Hospitality | 2013 |
| GJK Contracts Digger Dumper Hire Ltd | Construction | 2021 |
| Gjmp Limited | Real estate | 2013 |
| GJO Artistry Ltd | Information & communication | 2022 |
| GJO Creative Services Ltd | Information & communication | 2021 |
| GJT Optical Limited | Wholesale & retail | 2022 |
| GKM Havens Limited | Households | 2025 |
| GKW Renting Ltd | Real estate | 2025 |
| GL Plastering & Sons Ltd | Construction | 2014 |
| Gladstone Mitchell Ltd | Manufacturing | 2024 |
| Glakron Limited | Extraterritorial | 1971 |
| Glaksy Ltd | Financial services | 2024 |
| Glam & Glow by Billie Swift Ltd | Other services | 2023 |
| Glandore Business Centres (Services) Limited | | 2006 |
| Glandore Business Centres Limited | | 2006 |
| Glandore UK Limited | Administrative & support | 2015 |
| Glantane Drive Management Limited | Real estate | 2004 |
| Glappin Ltd | Wholesale & retail | 2022 |
| Glaser Bernd Ltd | Wholesale & retail | 2023 |
| Glashill Limited | Construction | 2003 |
| Glasmala Ltd | Real estate | 2022 |