| Futuregrid Technologies Limited | Real estate | 2015 |
| Gafcon Ireland | Administrative & support | 2016 |
| Ganzhi Consulting Ltd | Information & communication | 2014 |
| Gastroni Limited | Health & social care | 2019 |
| Gate Interiors Ltd | Construction | 2013 |
| Gather of Ireland Ltd | Manufacturing | 2021 |
| Gavara Limited | Real estate | 2001 |
| GBM Tattoo Ltd | Other services | 2020 |
| Gbni Ltd | Transport & logistics | 2017 |
| GED Homes Ltd | Real estate | 2022 |
| GEN Tech Holdings (N.I.) Limited | Administrative & support | 2021 |
| GEN Tech Staffing Warehouse and Logistics Ltd | Administrative & support | 2023 |
| General Merchants (Antrim Road) Limited | Other services | 2022 |
| General Merchants (Donegall Place) Limited | Hospitality | 2021 |
| General Merchants (NI) Limited | Hospitality | 2014 |
| General Merchants (Stranmillis) Limited | Hospitality | 2018 |
| General Merchants Property Limited | Real estate | 2019 |
| George Dorrian Public Affairs Limited | Professional & scientific | 2024 |
| GF Stores Ltd | Wholesale & retail | 2009 |
| GFJ Contracts Ltd. | Construction | 2013 |
| Gibson Auctions Limited | Professional & scientific | 2010 |
| Gimme Slice Limited | Wholesale & retail | 2026 |
| Glashedy Partners Limited | Financial services | 2020 |
| Glenanne Development Co. Limited | Construction | 1970 |
| Glenkeen Court Management Company Limited | Households | 1983 |
| Glenlion Ltd | Professional & scientific | 2015 |
| GMC Contractors Ltd | Construction | 2015 |
| Golfing Dreams Ltd | Real estate | 2026 |
| Gortagreenan Limited | Financial services | 2022 |
| Governor's Gate Management Company Limited | Households | 2003 |
| GR Takeout Limited | Hospitality | 2023 |
| GRA Planning and Development Limited | Professional & scientific | 2025 |
| GRA15 Consultants Ltd | Arts & recreation | 2026 |
| Gramar (Properties) Limited | Construction | 1960 |
| Grange Wine Merchants Limited | Wholesale & retail | 2009 |
| Grangemohr Management Company Limited | Households | 2014 |
| Gravis Planning Limited | Professional & scientific | 2005 |
| Green Inc. Film & Television Ltd | Information & communication | 2001 |
| Green Salon Collective Ltd | Water & waste | 2020 |
| Greenpoint Ales Ltd | Hospitality | 2024 |
| Greenway Industrial Investments Limited | Real estate | 2015 |
| Guilt Trip NI Limited | Hospitality | 2016 |
| H&O Consulting (N.I.) Limited | Other services | 2021 |
| Haller Clarke Hurson Ltd | Professional & scientific | 2025 |
| Hampton Investment Company Limited | Real estate | 1956 |
| Hand Surgery NI Ltd | Health & social care | 2014 |
| Harbinson Consulting Limited | Professional & scientific | 2015 |
| Hargrave Lane Ltd | Real estate | 2025 |
| Harrison Hospitality Limited | Hospitality | 2024 |
| Harrison Hospitality NO1 Limited | Hospitality | 2025 |
| Harrison Hospitality NO2 Limited | Hospitality | 2025 |
| Hartfields Management Company Limited | Households | 2012 |
| Haybail Liquor Co. Ltd | Manufacturing | 2022 |
| HCI Bidco 1 Limited | Professional & scientific | 2025 |
| HCI Bidco 2 Limited | Professional & scientific | 2025 |
| HCI Care Services UK Limited | Professional & scientific | 2026 |
| Headstogether Consulting Ltd | Professional & scientific | 2013 |
| Healthcare Ireland (Belfast) Ltd | Health & social care | 2013 |
| Healthcare Ireland (H) Limited | Real estate | 2025 |
| Healthcare Ireland (Management) Limited | Professional & scientific | 2026 |
| Healthcare Ireland (Midco) Limited | Financial services | 2022 |
| Healthcare Ireland (NO.2) Limited | Health & social care | 2020 |
| Healthcare Ireland (NO.3) Limited | Extraterritorial | 2025 |
| Healthcare Ireland (NO.4) Limited | Health & social care | 2021 |
| Healthcare Ireland Group Limited | Professional & scientific | 2021 |
| Healthcare Ireland Limited | Financial services | 2025 |
| Heathdene Properties Limited | Real estate | 2024 |
| Hellbent Catering Ltd | Hospitality | 2020 |
| HI Burger ATR Limited | Hospitality | 2026 |
| HI Burger Belfast Limited | Hospitality | 2022 |
| Hide and Seek Ltd | Administrative & support | 2016 |
| High Seas Ltd | Real estate | 2017 |
| High Street (Comber) Management Company Ltd | Households | 2025 |
| High Street Holywood Limited | Real estate | 2023 |
| Highbury Marketing Ltd | Professional & scientific | 2013 |
| Highline Developments Limited | Real estate | 2017 |
| Hilldene Investments (N.I.) | Education | 2016 |
| Hillhead Reclamation and Salvage Limited | Water & waste | 2020 |
| Hinterland Capital Ltd | Real estate | 2018 |
| HM Systems NI Limited | Professional & scientific | 2021 |
| Holdfast Holywood Ltd | Other services | 2022 |
| Holiday Rentals (Ireland) Limited | Real estate | 2018 |
| Holywood Advisory Ltd. | Professional & scientific | 2023 |
| Holywood Care at Home Limited | Public administration | 2025 |
| Holywood Community Sports Association Limited | Arts & recreation | 2023 |
| Holywood Dental Laboratory Limited | Health & social care | 2017 |
| Holywood Old School Preservation Trust | Real estate | 2004 |
| Holywood Pickleball Club CIC | Arts & recreation | 2025 |
| Holywood Pilates and Physiotherapy Limited | Arts & recreation | 2022 |
| Holywood Play Company Ltd | Health & social care | 2016 |
| Holywood Private Clinic Ltd | Health & social care | 2020 |
| Holywood Road Developments Limited | Real estate | 2019 |
| Holywood Shared Town | Other services | 2013 |
| Holywood Transition Town Limited | Other services | 2009 |
| Holywood Ventures Limited | Information & communication | 2020 |
| Home to Home (N. Ireland) Ltd | Real estate | 2013 |
| Home to Home North Down Limited | Real estate | 2015 |
| Homes by Andrew Dunlop Ltd | Construction | 2020 |
| Hongu Limited | Professional & scientific | 2025 |
| Hooked Belfast Limited | Other services | 2023 |