| HJS Developments Limited | Real estate | 1989 |
| Hjsc Limited | Financial services | 2021 |
| Hjshkksm Ltd | Wholesale & retail | 2024 |
| HK Aolida Trading Limited | Wholesale & retail | 2025 |
| HK Belfast Ltd | Hospitality | 2017 |
| HK Crossborderpayment Limited | Wholesale & retail | 2025 |
| HK Jiafeng Technology Limited | Wholesale & retail | 2025 |
| HK Minuo International Trade Co Limited | Wholesale & retail | 2025 |
| HK Minzhi Limited | Wholesale & retail | 2025 |
| HK World Lighting Equi Pment Limited | Wholesale & retail | 2024 |
| HKG Technologies Ltd | Information & communication | 2021 |
| HL Aviation Ltd | Manufacturing | 2019 |
| HL Estates Ltd | Real estate | 2017 |
| Hl&T Beauty Limited | Other services | 2025 |
| HLB MF Holdco Ltd | Professional & scientific | 2023 |
| HLF Solutions Ltd. | Information & communication | 2022 |
| HLH Holdings Ltd | Financial services | 2019 |
| Hlinc Golf Limited | Wholesale & retail | 2023 |
| Hlouiser Ltd | Wholesale & retail | 2024 |
| Hlwa Retails Ltd | Wholesale & retail | 2023 |
| HM 203 Limited | Hospitality | 2017 |
| HM Lodgings Limited | Real estate | 2024 |
| HM Wealth Management LLP | | 2007 |
| Hmcr Consult Limited | Professional & scientific | 2017 |
| HMD Architects Ltd | Professional & scientific | 2001 |
| Hminvent Limited | Information & communication | 2018 |
| HMK (Belfast) Ltd | Professional & scientific | 2023 |
| HMK Property Management Ltd | Real estate | 2020 |
| HMV Northern Ireland Limited | | 1997 |
| HN Consultants Ltd | Professional & scientific | 2019 |
| HNA Developments Limited | Construction | 2009 |
| Hnfr 2025 Realisations Limited | Wholesale & retail | 2021 |
| HNH Partners Limited | Professional & scientific | 2013 |
| HO CHI Limited | Hospitality | 2023 |
| Hoala Holdings Limited | Information & communication | 2022 |
| Hoala Living (UK) Limited | Information & communication | 2022 |
| Hobart Hall Management Company Ltd | Real estate | 2024 |
| Hobby Horse Family Projects | Health & social care | 2017 |
| Hobo Chef Limited | Hospitality | 2017 |
| Hobo Kitchen LLP | | 2015 |
| Hoffman Patterson Ltd | Professional & scientific | 2014 |
| Hofish International Trading Limited | Wholesale & retail | 2023 |
| Hogood Shop Limited | Wholesale & retail | 2025 |
| Hoho Decoration Limited | Wholesale & retail | 2024 |
| Hoist IE Limited | Administrative & support | 2019 |
| Hoker Films Limited | Information & communication | 2018 |
| Hola Lola Limited | Information & communication | 2017 |
| Holborn Court Management Company (NI) Limited | Households | 2000 |
| Holdarragh Developments Ltd | Construction | 2017 |
| Holdco NO.5 Ltd | Extraterritorial | 2024 |
| Holdco NO.8 Ltd | Extraterritorial | 2024 |
| Holdco NO.9 Limited | Professional & scientific | 2022 |
| HOLDCO1 Limited | Administrative & support | 2025 |
| Holdfast Barbershop Limited | Other services | 2018 |
| Holdfast Orangefield Ltd | Other services | 2021 |
| Hole in the Wall Gang Limited | Information & communication | 1996 |
| Hole in the Wall Theatre Productions Ltd | Arts & recreation | 2026 |
| Holecutters NI Limited | Construction | 2026 |
| Holemasters (N.I.) Limited | Wholesale & retail | 1991 |
| Holg Limited | Construction | 2017 |
| Holiday Lets Services Limited | Real estate | 2018 |
| Holistic Health Holding Ltd | Financial services | 2022 |
| Holistic Investments Ltd | Wholesale & retail | 2025 |
| Holland & Barrett Retail Limited | | 2000 |
| Hollow Reed Ltd | Arts & recreation | 2025 |
| Hollowbridge Services Ltd | Wholesale & retail | 2025 |
| Hollowstone Trade LP | | 2019 |
| Holly Hall Management Limited | Households | 2009 |
| Holly Heath Management Company Limited | Real estate | 1991 |
| Holly Island Films Limited | Information & communication | 2019 |
| Hollybrook Contracts Limited | Construction | 2000 |
| Hollybrook Hill Management Company Limited | Real estate | 2015 |
| Hollycroft Management Limited | Households | 2007 |
| Hollyhill Developments (NI) Ltd | Construction | 2017 |
| Hollymount Developments Limited | Extraterritorial | 1989 |
| Hollytree Property Management Company Limited | Households | 2004 |
| Hollywood Nails (Belfast) Limited | Other services | 2014 |
| Holmes Construction Ltd | Construction | 2023 |
| Holmes Interiors N.I. Ltd | Manufacturing | 2023 |
| Holoedge Digital Ltd | Information & communication | 2024 |
| Holoedge Ltd | Information & communication | 2025 |
| Holohans N.I. Ltd | Hospitality | 2018 |
| Holohans Pantry Ltd | Hospitality | 2015 |
| Holomoon Limited | Manufacturing | 2021 |
| Holonga Ltd | Financial services | 2024 |
| Holsen Limited | Energy | 2014 |
| Holstein Apartments Management Company Limited | Households | 2018 |
| Holyknock Healthcare Limited | Health & social care | 2018 |
| Holyrood Residents Limited | Households | 1987 |
| Holywood Clinic Limited | Health & social care | 2015 |
| Holywood Healthcare Ltd | Health & social care | 2021 |
| Holywood Holdings Limited | Hospitality | 2019 |
| Holywood Homes Limited | Construction | 2005 |
| Holywood NDT Ltd | Administrative & support | 2018 |
| Holywood NO. 1 Limited | Hospitality | 2016 |
| Holywood Properties Ltd | Real estate | 2023 |
| Holywood Travel Solutions Limited | Administrative & support | 2025 |
| Home Choice Limited | Real estate | 1994 |
| Home Hero Cleaning Ltd | Administrative & support | 2016 |
| Home Hero Ltd | Administrative & support | 2016 |