| Nesbitt Property Management Limited | Real estate | 2021 |
| New Magic Takeaway Ltd | Hospitality | 2025 |
| Newbridge Integrated College Limited | Education | 1994 |
| NEY Plant Sales and Service Ltd | Manufacturing | 2023 |
| NI Portals Ltd | Information & communication | 2011 |
| NI Storage and Distribution Ltd | Transport & logistics | 2022 |
| NI652483 Ltd | Transport & logistics | 2018 |
| Niki's Kitchen Cafe Ltd | Hospitality | 2012 |
| NLZ LAB Services Ltd | Professional & scientific | 2019 |
| NMG 24HR Recovery & Transport Ltd | Transport & logistics | 2026 |
| NMG Car & Commercial Sales Ltd | Wholesale & retail | 2026 |
| Nomad Estate Advertising Ltd | Real estate | 2025 |
| North South Transport Ltd | Transport & logistics | 2016 |
| Northern HOMES1 Ltd | Construction | 2024 |
| Northern Ireland Karate Board | Arts & recreation | 2013 |
| Northern Ireland Optometric Society - the | Other services | 1953 |
| Nortrux Limited | Agriculture & fishing | 2015 |
| Nu-Look Kitchens & Bedrooms Ltd | Manufacturing | 2008 |
| Nublue Holdings Ltd | Real estate | 2021 |
| O'Hare & Company (Banbridge) Limited | Wholesale & retail | 2001 |
| O'Hare & SON Ltd | Construction | 2021 |
| Oak & Rein Ltd | Wholesale & retail | 2025 |
| Oaktree Property Consultancy Ltd | Real estate | 2010 |
| Odel (IRL) Limited | Wholesale & retail | 2004 |
| OFF Grid KIT Ltd | Wholesale & retail | 2022 |
| Ojbk 23 Ltd | Hospitality | 2020 |
| OK Wines Ltd | Hospitality | 2014 |
| Omaha (Fermanagh) Limited | Real estate | 2015 |
| Omega Fitness Ltd | Arts & recreation | 2025 |
| ORR Learning Ltd | Education | 2011 |
| Overtown Properties Limited | Professional & scientific | 1995 |
| P Byrne Electrical Ltd | Construction | 2016 |
| Pacelli Properties Limited | Real estate | 2021 |
| Paid Media Jobs Ltd | Administrative & support | 2025 |
| Pandco Ltd | Information & communication | 2010 |
| Park Agri Ltd | Agriculture & fishing | 2024 |
| Patchr Limited | Information & communication | 2025 |
| Patton Medicolegal Ltd | Health & social care | 2015 |
| Paul Hillen Plant Hire Ltd | Construction | 2019 |
| Paul Monaghan Entertainment Ltd | Administrative & support | 2024 |
| Peak Sales Partners Ltd | Information & communication | 2023 |
| Pebh Ltd | Transport & logistics | 2017 |
| Perry MC KEE Homes Limited | Construction | 2002 |
| PF Murphy & Sons Ltd | Construction | 2021 |
| Ph&S Ltd | Professional & scientific | 2017 |
| Phil Ryder Inspection Services Limited | Professional & scientific | 2025 |
| Philip Doyle Ltd | Professional & scientific | 2024 |
| PJA Property Group Ltd | Real estate | 2024 |
| Pjzx Properties Ltd | Households | 2025 |
| Playmore Gaming Ltd | Arts & recreation | 2022 |
| Playmore Skill Games Ltd | Arts & recreation | 2022 |
| Playpath Ltd | Health & social care | 2026 |
| PM Plant Ltd | Professional & scientific | 2023 |
| PM Trade Sales Ltd | Wholesale & retail | 2024 |
| PMA Farming Ltd | Agriculture & fishing | 2016 |
| PMG Coin Equipment Ltd | Arts & recreation | 2023 |
| PMK Properties Limited | Real estate | 2015 |
| Point to Point Racing Services (N.I.) Limited | Administrative & support | 2009 |
| Pomona Orchards Ltd | Manufacturing | 2017 |
| Porter Homes & Lettings Ltd | Real estate | 2024 |
| Portia Interiors Limited | Wholesale & retail | 2015 |
| Postsmart Ltd | Transport & logistics | 2018 |
| Potent Ideas Ltd | Professional & scientific | 2024 |
| Power and Control Systems Ltd | Manufacturing | 2019 |
| Power on Maintenance Ltd | Construction | 2022 |
| Powerscourt Pictures Ltd | Information & communication | 2015 |
| Powerville Ltd | Energy | 2016 |
| Practical Christian Outreach | Health & social care | 2010 |
| Precision Autoworx NI Limited | Wholesale & retail | 2026 |
| Precision Heating (NI) Ltd | Wholesale & retail | 2004 |
| Precision Implant Clinic Ltd | Health & social care | 2025 |
| Prestige Classic Limited | Wholesale & retail | 2014 |
| Primary Medcare Solutions Ltd | Information & communication | 2024 |
| Prime Admin Ltd | Administrative & support | 2024 |
| Primes Food NI Ltd | Hospitality | 2025 |
| Property Partners More Ltd | Real estate | 2014 |
| Ptsc Limited | Real estate | 2010 |
| Pyako Limited | Wholesale & retail | 2021 |
| Q Cabs Ltd | Transport & logistics | 2012 |
| Q.Riain Ltd | Professional & scientific | 2020 |
| Quantrim Limited | Construction | 2014 |
| Quarry Herd Ltd | Agriculture & fishing | 2017 |
| Quarterlands Road Ltd | Construction | 2018 |
| Quick Attach Ireland Ltd | Wholesale & retail | 2022 |
| Quicklet Property Management Limited | Real estate | 2010 |
| Quinn Moore Electrical Services Limited | Construction | 2019 |
| Quinn Quality Construction Ltd | Construction | 2026 |
| Qwantani Investments Ltd | Financial services | 2010 |
| R I Wilson Ltd | Wholesale & retail | 1995 |
| R Manson Contracts Ltd | Construction | 2020 |
| RAD Leisure Ltd | Wholesale & retail | 2024 |
| Ramore Investments Limited | Real estate | 2017 |
| Rankin Cook Ltd | Wholesale & retail | 2005 |
| Rantavan Limited | Financial services | 2023 |
| Ratarnet Eggs Ltd | Agriculture & fishing | 2020 |
| Rathbane Limited | Construction | 2023 |
| Rathdrum Properties Limited | Construction | 2007 |
| Rathfriland Market House Ltd | Education | 2025 |
| Raymac Hardware & Hire Ltd | Wholesale & retail | 2008 |
| Rbtrends Ltd | Wholesale & retail | 2024 |