| PCK Properties Ltd | Financial services | 2025 |
| PD Lifttrucks (NI) Limited | Administrative & support | 2021 |
| PD Livestock Limited | Agriculture & fishing | 2017 |
| PD WPC Products Limited | Construction | 2023 |
| PDC Management Ltd | Real estate | 2014 |
| Pdc-Ni Ltd | Construction | 2025 |
| Pdee Ltd | Construction | 2025 |
| PDF Services IRE Ltd | Transport & logistics | 2022 |
| Pdkc Holdings Limited | Financial services | 2021 |
| Pdmc Building Services Ltd | Construction | 2019 |
| PDP Plant Ltd | Administrative & support | 2018 |
| Peak Electric Ireland Ltd | Construction | 2015 |
| Peak Health & Mind Community Interest Company | Health & social care | 2020 |
| Peak Performance Recruitment (UK) Ltd | Administrative & support | 2015 |
| Peakform Rentals Ltd | Real estate | 2026 |
| Peakvision Ltd | Professional & scientific | 2025 |
| Pearl Redesign Ltd | Arts & recreation | 2015 |
| Pearl Rock Trading Ltd | Real estate | 2021 |
| Pekk Construction Ltd | Construction | 2018 |
| Peninsula Homes Contracts Limited | Arts & recreation | 2009 |
| Pentagon BUS Ltd | Wholesale & retail | 2025 |
| Pentony Transport Limited | Transport & logistics | 2020 |
| Pepper and Salt UK Ltd | Hospitality | 2023 |
| Perfect Yolk Limited | Wholesale & retail | 2023 |
| Perfectly Extracted Coffee Limited | Wholesale & retail | 2020 |
| Performance Education Ltd | Education | 2012 |
| Peril Validations Ltd | Financial services | 2014 |
| Period Homes Ireland Limited | Construction | 2007 |
| Personal Engraving NI Ltd | Wholesale & retail | 2018 |
| Personally Limited | Administrative & support | 2022 |
| Pet Connection Ltd | Wholesale & retail | 2003 |
| Peter Fearon Construction Ltd | Construction | 2025 |
| Peter Fitzpatrick Limited | Mining & quarrying | 1983 |
| Peter Hughes Farm Enterprise Limited | Agriculture & fishing | 2015 |
| Peter Martin Engineering Ltd | Manufacturing | 2015 |
| Peter Morgan Contracts Ltd | Construction | 2018 |
| Peter O'Hare Limited | Construction | 1996 |
| Peter Quinn & Company Limited | Agriculture & fishing | 2012 |
| Peter Rice Electrical Limited | Construction | 2016 |
| Peter Sands & Sons Limited | Other services | 2003 |
| Peter's Welding Limited | Construction | 2022 |
| Petersen Global Groups Ltd | Transport & logistics | 2024 |
| Petromark L.P. | | 2015 |
| PF Holdings Group Limited | Financial services | 2020 |
| PF Mechanical Ltd | Construction | 2021 |
| PFG Brand Attraction Holdings Limited | Wholesale & retail | 2023 |
| PG Bricklaying Ltd | Construction | 2016 |
| PGH Sports Ltd | Arts & recreation | 2026 |
| PGI (Ventures) Limited | Financial services | 2014 |
| PGM Capital Ltd | Financial services | 2020 |
| PGM Contracts Ltd | Construction | 2017 |
| PGM Properties Ltd | Real estate | 2026 |
| PH Group Limited | Extraterritorial | 2005 |
| PH Plant @ Utility Services Limited | Administrative & support | 2025 |
| PH Plumbing and Heating Limited | Construction | 2000 |
| PH05 Consultancy Ltd | Professional & scientific | 2018 |
| Phalcon Ltd | Construction | 2017 |
| Pharm VET Agency Limited | Health & social care | 2009 |
| Pharmaco Consulting International Ltd | Professional & scientific | 2015 |
| Pharmacon Limited | Professional & scientific | 2011 |
| Phil's Farm Riding for the Disabled | Other services | 2018 |
| Phil's Social Farm CIC | Agriculture & fishing | 2018 |
| Philipp Sebastan Waag Limited | Wholesale & retail | 2023 |
| Phillips Financial Planning Limited | Financial services | 2008 |
| Phoenix (2004) Limited | Real estate | 2004 |
| Phoenix Enterprises N.I. Ltd | Information & communication | 2024 |
| Phoenix Global Trade Services NI Ltd | Professional & scientific | 2026 |
| Phoenix Sports N. I. Ltd | Other services | 2025 |
| Phonetech Limited | Information & communication | 2002 |
| Phyliss Consulting LP | | 2014 |
| Phyron Research Ltd | Information & communication | 2025 |
| Physical Edge Gym Ltd | Arts & recreation | 2021 |
| PIC Building Services Limited | Construction | 2021 |
| Pick UR Brains Limited | Extraterritorial | 2025 |
| Picturecraft (NI) Ltd | Wholesale & retail | 2014 |
| Pietre Naturali Ltd | Manufacturing | 2015 |
| Pigeon ROW Ltd | Real estate | 2014 |
| Pigeon ROW VRB Ltd | Real estate | 2024 |
| Pilates FIX Studio Ltd | Arts & recreation | 2021 |
| Pinewood Lodge Limited | Manufacturing | 2024 |
| Pinnacle Sports Ireland Ltd | Arts & recreation | 2015 |
| Pious Hill Homes Ltd | Construction | 2025 |
| Pipe Tech Plumbing & Mechanical Ltd | Construction | 2010 |
| Pipersbars Ltd | Hospitality | 2026 |
| Pips Hope & Support Ltd | Education | 2011 |
| Pixel Bliss Mobile Ltd | Information & communication | 2023 |
| PJ & EJ Doherty Holding Limited | Financial services | 2017 |
| Pj&P Electrical Ltd | Construction | 2024 |
| PJM (NI) Tools Limited | Wholesale & retail | 2024 |
| PJM Trading (2021) Ltd | Wholesale & retail | 2021 |
| PJW Windows Ltd | Construction | 2024 |
| PK Commercials Limited | Wholesale & retail | 2016 |
| PK Electrics Ltd | Construction | 2026 |
| PKD Construction L.P. | | 2015 |
| PKP Plastering & Construction Ltd | Construction | 2016 |
| PKZ 8 Ltd | Construction | 2021 |
| PL Fegan Potatoes Ltd | Agriculture & fishing | 2009 |
| PL Plastering Ltd | Construction | 2021 |
| Planning Support Resources NI | Professional & scientific | 2025 |
| Plasti-Sol Ltd | Manufacturing | 2023 |