| Niall Eames Limited | Health & social care | 2012 |
| NIC International Services LP | | 2020 |
| Nicole Corr Support Services Ltd | Health & social care | 2025 |
| Nifcc Limited | Extraterritorial | 2000 |
| Nijja Ltd | Arts & recreation | 2024 |
| Nikallo International LP | | 2026 |
| Nikomed Holding Ltd | Financial services | 2025 |
| Nilfix Northern Ireland Limited | Wholesale & retail | 2001 |
| Ninth Wave GIN Company Limited | Manufacturing | 2018 |
| Nipanc | Health & social care | 2020 |
| Nipscbf | Other services | 2019 |
| Nisoft (UK) Limited | Information & communication | 1997 |
| Nisoft Holdings II Limited | Information & communication | 2021 |
| Nisoft Holdings Limited | Information & communication | 2007 |
| Nistars Ltd | Arts & recreation | 2022 |
| Nivotec Limited | Information & communication | 2010 |
| NJ Online Coaching Ltd | Health & social care | 2021 |
| NL000161 LP | | 2015 |
| NL000491 LP | | 2017 |
| NL000501 LP | | 2017 |
| NL000635 LP | | 2018 |
| NL000671 LP | | 2018 |
| NL000730 LP | | 2019 |
| NL000759 LP | | 2020 |
| NL000784 LP | | 2020 |
| NL000809 LP | | 2021 |
| NL000819 LP | | 2021 |
| NL000821 LP | | 2021 |
| NL000828 LP | | 2021 |
| NL000836 LP | | 2022 |
| NL000837 LP | | 2022 |
| NL000852 LP | | 2022 |
| NL000855 LP | | 2022 |
| NL000863 LP | | 2022 |
| NL000868 LP | | 2022 |
| NL000872 LP | | 2022 |
| NL000874 LP | | 2022 |
| NL000875 LP | | 2022 |
| NL000876 LP | | 2022 |
| NL000879 LP | | 2022 |
| NL000880 LP | | 2022 |
| NL000881 LP | | 2022 |
| NL000882 LP | | 2022 |
| NL000883 LP | | 2022 |
| NL000884 LP | | 2023 |
| NL000885 LP | | 2023 |
| NL000886 LP | | 2023 |
| NL000887 LP | | 2023 |
| NL000888 LP | | 2023 |
| NL000890 LP | | 2023 |
| NL000895 LP | | 2023 |
| NL00090 LP | | 2014 |
| NL000906 LP | | 2024 |
| NL000909 LP | | 2024 |
| NL00889 LP | | 2023 |
| NLS Teamwear Ltd | Wholesale & retail | 2025 |
| NO 14 at the Georgian House Ltd | Hospitality | 2019 |
| Nobeyoku Ltd | Wholesale & retail | 2026 |
| Nobile Investment LLP | | 2015 |
| Noble PT Ltd | Health & social care | 2019 |
| Nolan Market LLP | | 2015 |
| Nordersar Ltd | Wholesale & retail | 2026 |
| Norspace Limited | Administrative & support | 1985 |
| North Atlantic Salmon Fund (NI) | Professional & scientific | 2002 |
| North Down Automation Limited | Construction | 2024 |
| North Industrial Services Ltd | Manufacturing | 2023 |
| North Ridge Homes Ltd | Construction | 2016 |
| North Time & Data Limited | Information & communication | 1988 |
| North Time Enterprises Limited | Financial services | 2025 |
| North Time Holdings Limited | Real estate | 2014 |
| North Time Investments Limited | Real estate | 2021 |
| North West Decorating Limited | Construction | 2010 |
| Northern Cinemas Limited | Extraterritorial | 1980 |
| Northern Financial Services Limited | Financial services | 1984 |
| Northern Group Limited | Extraterritorial | 1997 |
| Northern Ireland Food Chain Certification | Professional & scientific | 2001 |
| Northern Lift Trucks (N.I.) Limited | Wholesale & retail | 1984 |
| Northern Mechanical & Metalwork Ltd | Manufacturing | 2025 |
| Northern Tree Services Ltd | Construction | 2012 |
| Northside Construction (2016) Ltd | Construction | 2016 |
| Northstar Holding Group Limited | Real estate | 2025 |
| Northstar Residences Ltd | Hospitality | 2017 |
| NOT BE Back Ltd | Wholesale & retail | 2024 |
| Nout Ltd | Information & communication | 2019 |
| Nova Consulting Solutions LP | | 2024 |
| Novinka.Buzz Ltd. | Agriculture & fishing | 2025 |
| Novon Technologies Limited | Administrative & support | 2026 |
| Noweargn Ltd | Wholesale & retail | 2026 |
| Noxtech Ltd | Professional & scientific | 2017 |
| Nponline LP | | 2022 |
| Npwrher Ltd | Arts & recreation | 2026 |
| NSD Trading Limited | Hospitality | 2018 |
| NT Transport Limited | Transport & logistics | 2020 |
| Nucar Ltd | Wholesale & retail | 2026 |
| Nude Skin Ltd | Wholesale & retail | 2025 |
| Nugent Property Management Ltd | Households | 2023 |
| Nursing & Caring Direct Limited | Administrative & support | 1995 |
| Nutrition Dock Limited | Arts & recreation | 2017 |
| Nvbarbers Ltd | Other services | 2024 |
| O&To Ltd | Health & social care | 2022 |