| Peanut Commerce LP | | 2018 |
| Peartree Barn Nursery Ltd | Health & social care | 2012 |
| Pegasus Orthotics Ltd | Manufacturing | 2013 |
| People Before Process Ltd | Professional & scientific | 2023 |
| Perceptive Insight Market Research Limited | Professional & scientific | 2006 |
| Percival Limited | Hospitality | 2022 |
| Percy Group Limited | Administrative & support | 2018 |
| Peregrine Healthcare Group Limited | Health & social care | 2023 |
| Perry Concrete Ltd | Manufacturing | 2020 |
| Peter Mcgloin Opticians Ltd | Health & social care | 2008 |
| Peter Rabbit Day Nursery Limited | Other services | 2009 |
| Peter's Patch After School Ltd. | Health & social care | 2015 |
| Petjensio Limited | Professional & scientific | 2026 |
| Pettrans Ltd | Transport & logistics | 2005 |
| PHG Holdings Limited | Energy | 2013 |
| Phillip Mccallen Motorcycles Ltd | Wholesale & retail | 1999 |
| Phillips (Lisburn) Limited | Wholesale & retail | 1987 |
| Philosophy, Life and Faith Ltd | Education | 2025 |
| Phoenix Fire and Security Belfast Ltd | Administrative & support | 2024 |
| Photonic Measurements Limited | Manufacturing | 2014 |
| Pictura Contracts Limited | Construction | 2017 |
| Pilates N. Ireland Ltd | Extraterritorial | 2016 |
| Pine Hill Farm Ltd | Agriculture & fishing | 2024 |
| Pinehill Consulting Ltd | Health & social care | 2025 |
| Pinehill Swimming Ltd | Arts & recreation | 2024 |
| Pink Banana Ltd | Information & communication | 2018 |
| Pinnacle Distribution N I Ltd | Wholesale & retail | 2024 |
| Pinnacle Growth Group Limited | Professional & scientific | 2017 |
| Pinnacle Work Media Services LLP | | 2017 |
| Pitman Agencies Limited | Wholesale & retail | 1985 |
| Pitstop Motors NI (Lisburn) Ltd | Wholesale & retail | 2026 |
| Pitstop Van Centre NI Ltd | Wholesale & retail | 2026 |
| Pixel Pitch Ltd | Professional & scientific | 2026 |
| Pixsmith Fotos Ltd | Professional & scientific | 2023 |
| PJF Computer Solutions Ltd | Information & communication | 2007 |
| PJR Property Group Limited | Real estate | 2026 |
| PJR Retail Limited | Wholesale & retail | 2017 |
| Plant Lubrication (N.I.) Limited | Wholesale & retail | 1974 |
| Plantation Court Management Ltd | Households | 2004 |
| Plate Glass Inns Limited | Hospitality | 2004 |
| Platinum Print & Promotions Limited | Manufacturing | 2019 |
| Play Services Ireland Ltd | Other services | 2010 |
| Plni Properties Ltd | Real estate | 2022 |
| PM Power Limited | Manufacturing | 2020 |
| PMC Electrical (2022) Ltd | Construction | 2022 |
| Pmca MMA Ltd | Arts & recreation | 2024 |
| PMH Homes Ltd | Construction | 2018 |
| PML Contracts Ltd | Construction | 2013 |
| PMR Retail Ltd | Wholesale & retail | 2025 |
| PNW1963 Ltd | Professional & scientific | 2021 |
| Point & Shoot Productions Limited | Information & communication | 2025 |
| Polite Corporation LP | | 2018 |
| Poppi Technologies Limited | Financial services | 2020 |
| Porter Coleraine Limited | Construction | 2025 |
| Porter Contracts (Lisburn) Ltd | Agriculture & fishing | 2017 |
| Portmore Developments Ltd | Construction | 2025 |
| Portstewart Holiday Parks Holdings Ltd | Wholesale & retail | 2025 |
| Positive Mental Health Connections C.I.C. | Health & social care | 2021 |
| Poslink Limited | Financial services | 2023 |
| Posture Recruitment Limited | Administrative & support | 2021 |
| Powell Consultancy Services Limited | Professional & scientific | 2012 |
| Power Action Limited | Manufacturing | 1992 |
| Power IQ Ltd | Information & communication | 2022 |
| Powerair Compressors Vacuum Pumps and Blowers Ltd | Energy | 2026 |
| Powerair Holdings Limited | Extraterritorial | 2006 |
| Powerair Limited | Manufacturing | 2004 |
| Powerhouse Generation Limited | Energy | 2013 |
| Precious Vision LLP | | 2019 |
| Premier Building Design Limited | Professional & scientific | 2006 |
| Premium Legal Solutions Ltd | Other services | 2018 |
| Premium Productions Ltd | Health & social care | 2026 |
| Pressford Shutters and Shop Fronts Ltd | Manufacturing | 2016 |
| Pressure Hydraulics Ltd | | 2001 |
| Prestige Tours Ireland Ltd | Administrative & support | 2023 |
| Pretiosum Ltd | Other services | 2017 |
| PRIME1 Networks LLP | | 2017 |
| Primed Advisors Limited | Professional & scientific | 2020 |
| Primeway Wide Solutions LLP | | 2020 |
| Primrose Communications Ltd | Information & communication | 2024 |
| PRM Brands Ltd | Manufacturing | 2014 |
| PRM Developments Ltd | Administrative & support | 2014 |
| PRM Group Ltd | Administrative & support | 2009 |
| PRM Haulage Ltd | Transport & logistics | 2012 |
| PRM Logistics Ltd | Transport & logistics | 2005 |
| PRM Transport Ltd | Transport & logistics | 2019 |
| PRM Transport Services Ltd | Transport & logistics | 2016 |
| PRM Transportation Ltd | Transport & logistics | 2010 |
| Pro-Level Groundworks Ltd | Construction | 2016 |
| Prohibition Limited | Wholesale & retail | 2013 |
| Prohold Property Holding Limited | Real estate | 2017 |
| Pronto Distribution Ltd | Transport & logistics | 2020 |
| Propeer Solutions Ltd | Information & communication | 2017 |
| Property Investments K&R Limited | Real estate | 2023 |
| Property Investments Packaging Ltd | Construction | 2022 |
| Property Safe Ltd | Real estate | 2020 |
| Property Support Services N.I. Limited | Construction | 2021 |
| Protect Systems Ltd | Administrative & support | 2022 |
| Proto Developments Ltd | Construction | 2013 |
| Proud Mary Ltd | Wholesale & retail | 2022 |
| PRS Security Systems Ltd | Administrative & support | 2026 |