| Home Improvements and Roofing Services Ltd | Construction | 2025 |
| Home Network Solutions NI Ltd | Information & communication | 2018 |
| Home-Start North Belfast | Health & social care | 2007 |
| Home-Start South and East Belfast | Health & social care | 1987 |
| Homebird Co Belfast Ltd | Health & social care | 2026 |
| Homecare Software Solutions Limited | Information & communication | 2018 |
| Homeebliss Limited | Wholesale & retail | 2024 |
| Homefit Group Ltd | Wholesale & retail | 1999 |
| Homehub Kids Klub Limited | Health & social care | 2022 |
| Homepage Handlers Limited | Professional & scientific | 2026 |
| Homeplus NI Ltd | Health & social care | 2006 |
| Homes (Belfast) Limited | Real estate | 2021 |
| Homes of Stone Ltd | | 2005 |
| Homesni Bluecubes Ltd | Information & communication | 2024 |
| Homesni Ltd | Information & communication | 2024 |
| Homesparency Limited | Information & communication | 2025 |
| Hometime Group Limited | Wholesale & retail | 2013 |
| Hometown Tours Belfast Limited | Administrative & support | 2024 |
| Homewrap Ltd | Wholesale & retail | 2025 |
| Homorrow Limited | Wholesale & retail | 2025 |
| HON Properties Limited | Construction | 2019 |
| Honcho Media Limited | Professional & scientific | 2014 |
| Honest Cloud Ltd | Information & communication | 2025 |
| Honest Family Limited | Wholesale & retail | 2023 |
| Honey (NI) Limited | Wholesale & retail | 2002 |
| Honey B Limited | Wholesale & retail | 2012 |
| Honey One Care Limited | Health & social care | 2025 |
| Honey Shuffle Limited | Wholesale & retail | 2026 |
| Honeycomb Jobs Limited | Administrative & support | 2016 |
| Honeys Gourmet Sandwich Bar Limited | Hospitality | 2025 |
| Hong 83 Ltd | Hospitality | 2024 |
| Hong International Trading Limited | Wholesale & retail | 2026 |
| Hong Kong 0779 Ltd | Hospitality | 2024 |
| Hong Kong Crescent Ltd | Real estate | 2022 |
| Hong Kong Feixiang Limited | Wholesale & retail | 2025 |
| Hong Kong Hanjing Trading Limited | Wholesale & retail | 2026 |
| Hong Kong Minyo Limited | Wholesale & retail | 2026 |
| Hong Kong Time Plus Jewelry Co Limited | Wholesale & retail | 2025 |
| Hong Kong Xiangtian Technology Trade Co., Limited | Wholesale & retail | 2025 |
| Hong Shana Ltd | Wholesale & retail | 2023 |
| Hong XIN Happy Choice Limited | Hospitality | 2023 |
| Hongkong Ancllo International Trading Co Limited | Wholesale & retail | 2026 |
| Hongkong Hanko Electronic Co Limited | Wholesale & retail | 2026 |
| Hongkong Huachen Trading Limited | Wholesale & retail | 2025 |
| Hongkong Shunxinda Technology Limited | Wholesale & retail | 2025 |
| Hongkong Siuon Technology Co Limited | Wholesale & retail | 2025 |
| Hongkong Smarteye International Trade Co., Limited | Wholesale & retail | 2025 |
| Hongkong Thousandshores Limited | Wholesale & retail | 2026 |
| Hongkong Trojan Technology Limited | Wholesale & retail | 2025 |
| Hongkong Win-Win Technology Limited | Wholesale & retail | 2025 |
| Hongkong Yuanhong ET Limited | Wholesale & retail | 2025 |
| Honglan Limited | Wholesale & retail | 2023 |
| Hongming LIU Trading Ltd | Wholesale & retail | 2025 |
| Hongzeng LI E-Commerce Ltd | Wholesale & retail | 2025 |
| Hood Mcgowan Kirk LLP | | 2017 |
| Hooded Crow Ltd | Professional & scientific | 2025 |
| Hook Training Limited | Education | 2011 |
| Hool Law Limited | Professional & scientific | 2015 |
| Hoolers Ltd | Wholesale & retail | 2025 |
| HOP Padel Ltd | Arts & recreation | 2026 |
| Hope 4 UR Life Limited | Health & social care | 2015 |
| Hope Harbour Ltd | Wholesale & retail | 2025 |
| Hope House (HH) | Health & social care | 2014 |
| Hope Investments (NI) Ltd | Hospitality | 2020 |
| Hope Mental Wellbeing Ltd | Health & social care | 2025 |
| Hope to Help Investments Limited | Financial services | 2023 |
| Hope to Help Properties Limited | Financial services | 2023 |
| Hopefield Management Company Limited | Households | 2003 |
| Hopeyousee Limited | Administrative & support | 2025 |
| Hopkins Surveyors Limited | Professional & scientific | 2017 |
| Hopple Brands Limited | Wholesale & retail | 2020 |
| Horatio Pubs Limited | Hospitality | 2013 |
| Horatio Taverns Limited | Hospitality | 2013 |
| Horizon Aero Limited | Professional & scientific | 2024 |
| Horizon Engineering Solutions Ltd | Construction | 2015 |
| Horizon Financial Management Ltd. | Financial services | 2009 |
| Horizon X Holding Company Limited | Financial services | 2022 |
| Horn Andrew Ltd | Wholesale & retail | 2023 |
| Horn of Africa People's AID Northern Ireland (Hapani) | Hospitality | 2011 |
| Hornbeam Healthcare Ltd | Health & social care | 2024 |
| Horndrive Ltd | Hospitality | 2021 |
| Horner Components Ltd | Wholesale & retail | 2014 |
| Horner Group Ltd | Administrative & support | 2025 |
| Horner Ltd | Administrative & support | 2005 |
| Horrible Brands Ltd | Information & communication | 2024 |
| Horse Island Ltd | Hospitality | 2022 |
| Horsepark Wind Ltd | Energy | 2015 |
| Horsepower Ireland Ltd | | 1999 |
| Horst Reef Limited | Wholesale & retail | 2025 |
| Hortus Property Ltd | Hospitality | 2016 |
| Hose Doctor (N.I.) Limited | Manufacturing | 2020 |
| Hosford Community Homes Ltd | Real estate | 2025 |
| Hoshi Spirits Limited | Wholesale & retail | 2023 |
| Hospital Services Limited | Wholesale & retail | 1962 |
| Hospitality Belfast Ltd | Hospitality | 2018 |
| Hospitality Solutions N.I Ltd | Professional & scientific | 2025 |
| Hospitality Textile Services Ltd | Wholesale & retail | 2010 |
| Hospitality Wines Ltd | Wholesale & retail | 2023 |
| Hosta Projects Ltd | Arts & recreation | 2024 |
| Hostays Online Limited | Administrative & support | 2025 |