| Pegala Limited | Construction | 2017 |
| PEM Developments Limited | Construction | 2012 |
| Peoplewith Limited | Information & communication | 2017 |
| Pepper Contracts Limited | Other services | 2019 |
| Perspic Ltd | Information & communication | 2020 |
| Pet Stop (N.I.) Ltd | Wholesale & retail | 2026 |
| Pgcluk Consulting Limited | Information & communication | 2026 |
| PGF Forestry Limited | Agriculture & fishing | 2023 |
| PGK Plant & Civils Ltd | Construction | 2023 |
| PGL Car & Commercial Ltd | Wholesale & retail | 2021 |
| PGL Property Limited | Real estate | 2022 |
| PH Shotblasting & Spraying Services Ltd | Construction | 2009 |
| Phytopest NI Limited | Administrative & support | 2025 |
| Phyxate Ltd | Information & communication | 2011 |
| PIJ Holdings Ltd | Financial services | 2024 |
| PIJ Properties Ltd | Real estate | 2024 |
| Pitstop Auto Accessories Ltd | Wholesale & retail | 2017 |
| Pizza PIE Pizzeria Ltd | Hospitality | 2025 |
| PJ Gallagher Consultancy Ltd | Professional & scientific | 2022 |
| PJ Gallagher Group Ltd | Professional & scientific | 2023 |
| PJF Services Ltd | Professional & scientific | 2018 |
| PK Distribution and Hire Ltd | Administrative & support | 2013 |
| Pkeenan Limited | Professional & scientific | 2026 |
| Plan Produce Perfect Ltd | Professional & scientific | 2024 |
| Plumb Bricklaying Limited | Construction | 2020 |
| Plumbridge Livestock Sales Ltd | Wholesale & retail | 2011 |
| Plumbridge Plant Limited | Wholesale & retail | 2018 |
| Plumrush Ltd | Real estate | 2023 |
| PMC Concrete Flooring Ltd | Construction | 2008 |
| Pmece EOT Limited | Extraterritorial | 2025 |
| Pmem Investments Ltd | Real estate | 2025 |
| PMG Medical Ltd | Health & social care | 2023 |
| PMG Wind Farm Ltd | Energy | 2013 |
| PMK Group Ltd | Construction | 2023 |
| Pollbraddagh Farm Limited | Agriculture & fishing | 2025 |
| Pollock Commercial LLP | | 2015 |
| Polymer Matters 2 Limited | Financial services | 2025 |
| Polymer Matters Limited | Water & waste | 2022 |
| Pooka Promotions Ltd | Administrative & support | 2017 |
| Portmore Properties (NI) Ltd | Transport & logistics | 2015 |
| Power & Transmission Design Limited | Professional & scientific | 2022 |
| Power Grid Civils Limited | Construction | 2012 |
| Power Grid Holdings Limited | Financial services | 2021 |
| Powerhouse IRL Ltd | Manufacturing | 2014 |
| Precisionscreen NI Ltd | Manufacturing | 2009 |
| Premium Rentals NI Limited | Administrative & support | 2023 |
| Prestii Ltd | Wholesale & retail | 1982 |
| Pretty Little Pressies Ltd | Wholesale & retail | 2022 |
| Pretzel Play Ltd | Education | 2019 |
| Primary Sports Medicine Limited | Health & social care | 2020 |
| Prime Source Interactive Limited | Information & communication | 2025 |
| Prime Time Music Limited | Information & communication | 2014 |
| Principle Merchants (NI) Limited | Professional & scientific | 2016 |
| Priorstown Management Ltd | Professional & scientific | 2016 |
| Pro Plasterers Limited | Construction | 2018 |
| Product Design Pro Ltd | Professional & scientific | 2021 |
| Profab Engineering (N.I.) Ltd | Professional & scientific | 2023 |
| Professional Beverage Solutions Ltd | Manufacturing | 2023 |
| Professional Roofing Services Ltd | Construction | 2019 |
| Promax Wholesale Ltd | Wholesale & retail | 2022 |
| Propel Food Safety Ltd | Extraterritorial | 2023 |
| Prospect Investments Limited | Real estate | 2003 |
| Protectorplus: Security & First AID Solutions Ltd | Administrative & support | 2023 |
| Protosoftware Ltd | Information & communication | 2016 |
| Provincial Construction Services Ltd | Construction | 2025 |
| Provincial Developments & Services Ltd | Construction | 2004 |
| Provincial Holdings Limited | Financial services | 2023 |
| PSC Plant Limited | Construction | 2013 |
| PSG Direct Ltd | Information & communication | 2011 |
| Psych Fit Omagh Ltd | Health & social care | 2022 |
| PT Mcwilliams Earthworks Limited | Construction | 2014 |
| Puddleducks Playgroup Ltd | Education | 2021 |
| Pump IT Water Technology Ltd | Administrative & support | 2020 |
| PWC Services Ltd | Construction | 2024 |
| PZL Holdings Limited | Financial services | 2022 |
| Q&M Mechanical Services Ltd | Construction | 2024 |
| Quarry Recycling Parts Ltd | Mining & quarrying | 2022 |
| Quarryfit Ltd | Manufacturing | 2002 |
| Quench Bars Ltd | Hospitality | 2019 |
| Quiggery Construction Limited | Construction | 2018 |
| Quinn Agri Contracting Ltd | Administrative & support | 2021 |
| R Coyle Contracts Ltd | Construction | 2005 |
| R E Young Ltd | Agriculture & fishing | 2020 |
| R H Livestock Ltd | Agriculture & fishing | 2020 |
| R J Q Joinery Ltd | Construction | 2026 |
| R J Smyth Developments Ltd | Real estate | 2015 |
| R J Smyth Engineering Limited | Construction | 2003 |
| R Mallon Joinery Ltd | Construction | 2019 |
| R Scott Ltd. | Wholesale & retail | 2019 |
| R&R Commerce Ltd | Wholesale & retail | 2024 |
| R-Flow Contracts Ltd | Construction | 2025 |
| R.J.S. Developments Limited | Construction | 1999 |
| RA Pollock Auctioneers Limited | Wholesale & retail | 2022 |
| Ralbru Ltd | Professional & scientific | 2024 |
| RAM Site Solutions Ltd | Professional & scientific | 2025 |
| Rath Holdings Ltd | Financial services | 2022 |
| Raveagh Estates Ltd | Agriculture & fishing | 2023 |
| Raveagh Ltd | Energy | 2017 |
| RAW Eggs Limited | Manufacturing | 2016 |
| RAW Farm Limited | Agriculture & fishing | 2014 |