| Plates and Plans Ltd | Information & communication | 2025 |
| Platform One Newry Ltd | Hospitality | 2023 |
| Playfare Games Ltd | Education | 1959 |
| Playr-Fit Ltd | Wholesale & retail | 2018 |
| Plaza Car-Parking Ltd | Construction | 2025 |
| PLD Carpentry & Construction Ltd | Construction | 2025 |
| PLE Services Limited | Construction | 2016 |
| PLJ Contracts Limited | Construction | 2003 |
| Plotinus Limited | Professional & scientific | 2013 |
| Plough Historical and Cultural Group Limited | Professional & scientific | 2016 |
| PLP (Ireland) Limited | Water & waste | 2005 |
| Plumbavent Limited | Manufacturing | 2018 |
| PM Bricklaying Ltd | Construction | 2022 |
| PM Equine Limited | Agriculture & fishing | 2023 |
| PM Services Ireland Limited | Construction | 2021 |
| PMA Cars Ltd | Wholesale & retail | 2015 |
| PMA Commerical Limited | Wholesale & retail | 2020 |
| PMA Maintenance Management Ltd | Construction | 2026 |
| PMC Fishing Ltd | Agriculture & fishing | 2003 |
| PMK Accountancy Services Limited | Professional & scientific | 2014 |
| PMK Plumbing Group Ltd | Construction | 2025 |
| Pmlm Property Ltd | Real estate | 2021 |
| PMS Haulage Ltd | Transport & logistics | 2020 |
| PMT Commercial L.P. | | 2017 |
| Pocket Box Ltd | Information & communication | 2019 |
| POH Property Limited | Construction | 2023 |
| Point Plastics Limited | Manufacturing | 1991 |
| Point Road Cars Ltd | Wholesale & retail | 2024 |
| Point Shipping Services Ltd | Transport & logistics | 2014 |
| Pointside Services Limited | Wholesale & retail | 2018 |
| Poland Coach Works Ltd | Manufacturing | 2023 |
| POLE2PEAK Events Ltd | Administrative & support | 2023 |
| Policy Partners (Healthcare) Ltd | Professional & scientific | 2022 |
| Polka Fashions Europe Ltd | Wholesale & retail | 2021 |
| Polygrade Trans L.P. | | 2017 |
| Poplar Investments Limited | Hospitality | 2016 |
| Porcek Contracts Limited | Construction | 2017 |
| Portadown Community Radio Limited | Wholesale & retail | 2012 |
| Porterbelly Inns Ltd | Hospitality | 2019 |
| Portmax Limited | Agriculture & fishing | 2023 |
| Portonet L.P. | | 2017 |
| Posh PIG Hospitality Ltd | Hospitality | 2026 |
| POT Hill Property Limited | Real estate | 2024 |
| Potato Partners (NI) Limited | Agriculture & fishing | 2002 |
| Pouchers Limited | Other services | 2012 |
| Pound Lane Developments Limited | Households | 2009 |
| Power and Water Controls Limited | Professional & scientific | 1994 |
| Power Autoz Limited | Wholesale & retail | 2025 |
| Power PAC N.I. Limited | Administrative & support | 2019 |
| Powertest Electrical Limited | Construction | 2025 |
| Poyntyzpass Golf SIM Ltd | Arts & recreation | 2026 |
| Poyntzpass National School BPT Ltd | Education | 2023 |
| PPF Recovery Limited | Transport & logistics | 2016 |
| Ppmcss Services Ltd | Professional & scientific | 2020 |
| PPO Hire Centre Ltd | Administrative & support | 2016 |
| Praia Ltd | Real estate | 2023 |
| Precise Contracts Holdings Limited | Financial services | 2024 |
| Precise Contracts Joinery Limited | Manufacturing | 2024 |
| Precise Contracts Ltd | Construction | 2014 |
| Precision Electrical Estimating Ltd | Professional & scientific | 2025 |
| Precision Mechanical Estimating Ltd | Professional & scientific | 2025 |
| Pregnagum Ltd | Health & social care | 2025 |
| Premier Apartments (UK) Limited | Real estate | 2009 |
| Premier Property Claims Ltd | Financial services | 2024 |
| Premier Retail Solutions Ltd | Administrative & support | 2026 |
| Presbyopic Refraction Procedures Ltd | Health & social care | 2012 |
| Presbyopic Refractive Implants Ltd | Health & social care | 2023 |
| Prescott Payroll Services Ltd | Professional & scientific | 2015 |
| Prescott Trustee & Estates Ltd | Financial services | 2008 |
| Prestige Auto Body Ltd | Wholesale & retail | 2023 |
| Prestige N.I Ltd | Construction | 2020 |
| Prestige Skin Clinic Limited | Health & social care | 2015 |
| Prestige Surfaces Ltd | Construction | 2021 |
| Prestigious Memorials Ltd | Manufacturing | 2019 |
| Prestwick Limited | Construction | 2009 |
| Pretech Installations Ltd | Administrative & support | 2024 |
| Pretty Rifle Ltd | Wholesale & retail | 2026 |
| Primary Colours World Ltd | Wholesale & retail | 2020 |
| Prime Financial Ltd | Financial services | 2024 |
| Prime LPG NI Limited | Wholesale & retail | 2025 |
| Prime Metal Work Ltd | Construction | 2024 |
| Pringate Management Company Limited | Households | 2005 |
| Print My Picture Ltd | Wholesale & retail | 2022 |
| Priority Trans Express Limited | Transport & logistics | 2011 |
| Priority Truck Parts Limited | Wholesale & retail | 2005 |
| Pristine Motors (N.I.) Limited | Wholesale & retail | 2018 |
| Pritti Mama Limited | Wholesale & retail | 2021 |
| Private Edge AI Ltd | Information & communication | 2026 |
| Pro Auto Supplies Ltd | Wholesale & retail | 2015 |
| Pro Brick Builders Limited | Construction | 2023 |
| Pro-Fit Clothing Ltd | Wholesale & retail | 2020 |
| Process Panda Ltd | Information & communication | 2025 |
| Prof TEC. Limited | Information & communication | 2012 |
| Prof. Ciaran Donegan | Health & social care | 2014 |
| Prof. Frank Murray | Health & social care | 2010 |
| Prof. Hugh Mulcahy | Health & social care | 2010 |
| Prof. Oliver Mcanena | Health & social care | 2011 |
| Prof. Richard Costello | Health & social care | 2010 |
| Prof. Stephen Patchett | Health & social care | 2010 |
| Professional IT Training Solutions Limited | Education | 2014 |