| Glastry Farm Ice Cream Limited | Manufacturing | 2011 |
| Glastry Farm Ltd | Agriculture & fishing | 2022 |
| GLD Medical Ltd | Health & social care | 2023 |
| Glen CT Management Company Limited | Households | 2024 |
| Glen Road Developments Ltd | Real estate | 2021 |
| Glenallen Limited | Construction | 2013 |
| Glentor Investments Limited | Real estate | 1981 |
| Glenvale Beds Ltd | Wholesale & retail | 2022 |
| Glenview Digital Capital Ltd | Information & communication | 2022 |
| Glenwin Hardy Ltd | Financial services | 2005 |
| Global Security Qualifications Group Ltd | Administrative & support | 2016 |
| Glock David Ltd | Wholesale & retail | 2024 |
| Glorious Soar Limited | Wholesale & retail | 2024 |
| Glory Beautiful Limited | Manufacturing | 2023 |
| Glow Electric Ltd | Construction | 2021 |
| Glrrecom Ltd | Wholesale & retail | 2024 |
| Glynnpark Manor Limited | Real estate | 2014 |
| Go World Pharma Limited | Manufacturing | 2025 |
| Gocean Estates Limited | Real estate | 2018 |
| Gocute Mall Limited | Wholesale & retail | 2025 |
| Going Dutch 27 Ltd | Hospitality | 2025 |
| Gold Coast Comps Ltd | Arts & recreation | 2025 |
| Gold Flower Ltd | Wholesale & retail | 2025 |
| Gold Jade Limited | Wholesale & retail | 2024 |
| Golden Glen Management Company Limited | Households | 2019 |
| Golden River Newtownards Limited | Hospitality | 2023 |
| Golfhub Ltd | Arts & recreation | 2023 |
| Good Heat Fuels Limited | Wholesale & retail | 2019 |
| Good Hope (Portavogie) Ltd | Agriculture & fishing | 2013 |
| Gordon Brothers (NI) Limited | Construction | 2003 |
| Gordon Brothers FBI Ltd | Agriculture & fishing | 2021 |
| Gort Luis Ltd | Professional & scientific | 2014 |
| Gosna Global Agency Ltd. | Hospitality | 2016 |
| Gothfit Limited | Other services | 2025 |
| Gourleys Bar and Venue Limited | Hospitality | 2023 |
| Gowans of Ballyspurge Ltd | Hospitality | 2024 |
| GP Mcmanus Building Limited | Construction | 2021 |
| Graffan Investments Limited | Real estate | 2013 |
| Grahame Healthcare Ltd | Wholesale & retail | 2021 |
| Gray Sbowei Ltd | Wholesale & retail | 2024 |
| GRD Property Services Limited | Financial services | 2021 |
| Green Cleen (Lisburn & Ards Peninsula) Limited | Administrative & support | 2019 |
| Green Energy Store Ltd | Construction | 2010 |
| Green Energy Supply Limited | Construction | 2024 |
| Green Isle Residential Home Limited | Health & social care | 2006 |
| Greenacre Innovations Ltd | Manufacturing | 2010 |
| Greenaway Auto Electrics LLP | | 2026 |
| Greengraves Limited | Other services | 2007 |
| Greenthumb Treasures Ltd | Wholesale & retail | 2024 |
| Greenways (Newtownards) Limited | Real estate | 1961 |
| Greenwell Mews Management Company Limited | Households | 1999 |
| Greystone Property Holdings Ltd | Hospitality | 2023 |
| Griezmann Civils Limited | Construction | 2020 |
| Groarctesork Limited | Wholesale & retail | 2025 |
| Groomsport Cards Limited | Extraterritorial | 2021 |
| Groupicate Ubare Ltd | Wholesale & retail | 2025 |
| Growing Paws Dog Food Ltd | Manufacturing | 2022 |
| GRS Plumbing and Heating Ltd | Construction | 2023 |
| GS Plastering Contractors Ltd | Construction | 2019 |
| GSQ Solutions Ltd | Wholesale & retail | 2019 |
| Gtini Ltd | Administrative & support | 2012 |
| Guangdeng June Limited | Wholesale & retail | 2025 |
| Guardian 2022 Ltd | Professional & scientific | 2022 |
| Gulijin Limited | Wholesale & retail | 2024 |
| Gunawan Iyas Ltd | Wholesale & retail | 2024 |
| Gunson Electrical Ltd | Construction | 2026 |
| Guochunlin Limited | Wholesale & retail | 2025 |
| Guojun Haque Ltd | Wholesale & retail | 2024 |
| Guoqiyuan Ltd | Wholesale & retail | 2025 |
| Guott Contracts NI Ltd | Construction | 2025 |
| GWE Agri Limited | Professional & scientific | 2025 |
| Gwjs Property Ltd | Real estate | 2023 |
| GXM International Business Ltd | Wholesale & retail | 2025 |
| Gymea River Limited | Wholesale & retail | 2024 |
| H LEE Construction Ltd | Construction | 2020 |
| Hahayaxunderetail Ltd | Wholesale & retail | 2025 |
| Haijun WS Limited | Wholesale & retail | 2025 |
| Hair Incorporated Ltd | Other services | 2016 |
| Hakan Emen Limited | Wholesale & retail | 2025 |
| Hamilton Bogie the Mini Piling Company Ltd | Construction | 2002 |
| Hamilton Bros Ltd | Wholesale & retail | 2024 |
| Hamilton Erskine Limited | Manufacturing | 2003 |
| Hamilton Imports Ltd | Wholesale & retail | 2022 |
| Hammedith Limited | Wholesale & retail | 2025 |
| Hamza Newshop Limited | Wholesale & retail | 2025 |
| HAN Eong Limited | Wholesale & retail | 2024 |
| Handover App Ltd | Information & communication | 2022 |
| Hanna Financial Services Limited | Financial services | 2013 |
| Hanstar Business Ltd | Wholesale & retail | 2025 |
| Haoaugel Limited | Manufacturing | 2024 |
| Happy Valley Restaurant Ltd | Hospitality | 2025 |
| Happytown Ltd | Arts & recreation | 2011 |
| Haptik Ltd | Hospitality | 2014 |
| Haptik Two Ltd | Hospitality | 2021 |
| Hara Rinako Ltd | Wholesale & retail | 2025 |
| Hardy's Hardware & General Store Ltd | Wholesale & retail | 2011 |
| Harmattan Renewables (UK) Limited | Professional & scientific | 2021 |
| Harr LEE Limited | Wholesale & retail | 2025 |
| Harrisons of Greyabbey Limited | Wholesale & retail | 2011 |
| Hasco Europe Limited | Construction | 1995 |