| Nacelle Systems Consultancy Ltd | Professional & scientific | 2005 |
| NAI Properties Ltd | Construction | 2025 |
| Nanny's Takeaways Ltd | Hospitality | 2021 |
| NAR Hakki Ltd | Wholesale & retail | 2024 |
| Nara Design Ltd | Wholesale & retail | 2016 |
| Narrow Water Events Ltd | Hospitality | 2018 |
| Narrow Water Holdings Limited | Financial services | 2025 |
| Narrow Water Lodge Ltd | Hospitality | 2024 |
| Nasav Ltd | Real estate | 2024 |
| Nasfic Ltd | Financial services | 2024 |
| Nasiri Smart Bargains Ltd | Wholesale & retail | 2024 |
| Nathan Northern Ireland Ltd | Administrative & support | 2025 |
| Natino Limited | Other services | 2025 |
| National Auditing and Training Limited | Education | 2017 |
| Nationwide Wholesales Ltd | Wholesale & retail | 2025 |
| Natlex Networks L.P. | | 2015 |
| Natural Dairies N.I. Ltd | Extraterritorial | 2013 |
| Natural Energies Ireland Ltd | Professional & scientific | 2006 |
| Nautilus (NI) Limited | Professional & scientific | 2007 |
| Navac Contracts Limited | Administrative & support | 2016 |
| NB Prestige & Performance Ltd | Wholesale & retail | 2026 |
| NCB Construction Limited | Construction | 2014 |
| NCD Group Services Ltd | Construction | 2013 |
| NCL Transport Ltd | Transport & logistics | 2018 |
| Ncprotection Limited | Financial services | 2019 |
| NDK Aesthetics LLP | | 2025 |
| NDV Enterprises Ltd | Wholesale & retail | 2021 |
| NDX United L.P. | | 2017 |
| Nearynogs Stone Ground Chocolate Ltd | Manufacturing | 2018 |
| Need of Meats Limited | Hospitality | 2001 |
| Neilsen-Fforde (Life & Pensions) Limited | Financial services | 1977 |
| NEO Signs Ltd | Manufacturing | 2021 |
| Neos Design Studio Ltd | Information & communication | 2015 |
| Nestt Holdings Limited | Wholesale & retail | 2021 |
| Neswdjsunite Ltd | Professional & scientific | 2025 |
| NET1 (NI) Limited | Information & communication | 2012 |
| Neuhof Rainer Ltd | Wholesale & retail | 2024 |
| Neurobix Ltd | Health & social care | 2019 |
| Neuroeblana Ltd | Professional & scientific | 2020 |
| Neuromedical North | Health & social care | 2012 |
| Nevarc Ltd | Hospitality | 2025 |
| New Beginings (NI) Ltd. | Health & social care | 2016 |
| New Century Print and Design Ltd | Manufacturing | 2024 |
| New Life Directions | Education | 2003 |
| New Life Kitchen & Bath Ltd | Construction | 2021 |
| New Line Contractors ( NI ) Limited | Construction | 2024 |
| New Line Farm Ltd | Real estate | 2014 |
| New Sky Systems Limited | Manufacturing | 2023 |
| New U Life Limited | Wholesale & retail | 2018 |
| New YOU Dental & Skin Clinic Ltd | Health & social care | 2020 |
| Newage Electrical Limited | Wholesale & retail | 2012 |
| Newburg Construction L.P. | | 2015 |
| Newcastle Coach Hire Ltd | Transport & logistics | 2016 |
| Newcastle Storage Ltd | Administrative & support | 2024 |
| Newcel Paper Converters Limited | Manufacturing | 1973 |
| Newcon Construction Ltd | Construction | 2020 |
| Newdale Limited | Real estate | 1985 |
| Newell Engineering Ltd | Agriculture & fishing | 2017 |
| Newery Kebab & Curry Ltd | Hospitality | 2026 |
| Newgate Motor Group (NI) Limited | Wholesale & retail | 2024 |
| Newglen Electrical Ltd | Energy | 2019 |
| Newlough Joinery Ltd | Wholesale & retail | 2003 |
| Newo Media Ltd | Information & communication | 2021 |
| Newpharm Limited | Wholesale & retail | 1993 |
| Newridge Tractors Ltd | Wholesale & retail | 2022 |
| Newros Holdings Ltd | Construction | 2020 |
| Newry & District Motor Club Limited | Arts & recreation | 1974 |
| Newry & Mourne Community Transport | Transport & logistics | 2007 |
| Newry & Mourne Multiple Sclerosis Community Therapy Centre Limited | Health & social care | 1989 |
| Newry 4X4 Ltd | Wholesale & retail | 2025 |
| Newry and Mourne Co-Operative Limited | Real estate | 1986 |
| Newry Angling Centre Limited | Wholesale & retail | 2017 |
| Newry BID Company Limited | Other services | 2016 |
| Newry Biomass Limited | Energy | 2008 |
| Newry Car Wash and Valet Centre Ltd | Administrative & support | 2025 |
| Newry Caravans Ltd | Wholesale & retail | 2013 |
| Newry Chamber of Commerce & Trade | Other services | 1892 |
| Newry City Waste Ltd | Water & waste | 2019 |
| Newry Computer Centre Limited | Other services | 2003 |
| Newry Container Storage Ltd | Transport & logistics | 2022 |
| Newry Cycle Recycle C.I.C. | Wholesale & retail | 2020 |
| Newry Dance Theatre Arts Ltd | Arts & recreation | 2020 |
| Newry Denture Care Limited | Health & social care | 2012 |
| Newry Energy Storage Limited | Energy | 2020 |
| Newry Export Limited | Wholesale & retail | 2020 |
| Newry Filling Station Limited | Wholesale & retail | 1984 |
| Newry Food Centre Limited | Wholesale & retail | 2012 |
| Newry Fuel Centre Limited | Wholesale & retail | 2013 |
| Newry Funhouse Limited | Arts & recreation | 2010 |
| Newry Kebab Ltd | Hospitality | 2025 |
| Newry Leisure Ltd | Arts & recreation | 2016 |
| Newry Music School Ltd | Arts & recreation | 2015 |
| Newry Nails and Beauty Ltd | Other services | 2025 |
| Newry Nails Spa Ltd | Other services | 2023 |
| Newry Parish Centre | Wholesale & retail | 2012 |
| Newry Phood Company Ltd | Hospitality | 2019 |
| Newry Power Limited | Energy | 2023 |
| Newry Properties Limited | Households | 2018 |
| Newry Rugby Football Club Limited | Arts & recreation | 2009 |
| Newry Select Motor Co. Ltd | Wholesale & retail | 2023 |