| Pleasant View Holiday Park Limited | Hospitality | 2009 |
| Poke Media Ltd | Information & communication | 2024 |
| Polaris Integrated Technologies Ltd | Information & communication | 2023 |
| Polaris Intelligent Technologies Ltd | Manufacturing | 2025 |
| Polarpeak Limited | Real estate | 2008 |
| Police Money Matters Limited | Financial services | 2004 |
| Polkadex (PDX) Ltd | Real estate | 2025 |
| Pomeroy Cottage 5 Limited | Households | 2023 |
| Pomeroy Cottages Ltd | Hospitality | 2015 |
| Poole Homes Anglesey Ltd | Real estate | 2021 |
| Poole Homes Limited | Real estate | 2026 |
| Poole Homes Mostyn Ltd | Real estate | 2022 |
| Poppogoblin Ltd | Hospitality | 2016 |
| Pops Bangor Ltd | Hospitality | 2022 |
| Porky's Smokehouse Grill Ltd | Hospitality | 2016 |
| Port Dinorwic Yacht Harbour Residential Estate Limited | Real estate | 1996 |
| Portable Sustainable Power Ltd | Extraterritorial | 2023 |
| Portavo Ltd | Other services | 2021 |
| Portsandel Limited | Construction | 2004 |
| Portside (Lingar) Management Company Ltd | Households | 2017 |
| PQS Quantity Surveyors Limited | Construction | 2012 |
| PR Properties (N.I.) Ltd | Real estate | 2017 |
| Practice Edge Ltd | Professional & scientific | 2020 |
| Practicedigital.Com Ltd | Extraterritorial | 2012 |
| Pregnancy Choices Centre | Health & social care | 2021 |
| Premier Group NW Ltd | Transport & logistics | 2024 |
| Prestige Golf Getaways Ltd | Administrative & support | 2025 |
| Prestige North Down Ltd | Construction | 2018 |
| Prestige Weddings Limited | Other services | 2021 |
| Presto Music Academy Ltd | Education | 2023 |
| Primacy Meats Ltd | Wholesale & retail | 2010 |
| Primacy Properties Ltd | Real estate | 2016 |
| Princeton House Management Company Limited | Households | 2019 |
| Princetown Management (Bangor) Limited | Extraterritorial | 2020 |
| Princetown Management Limited | Extraterritorial | 1991 |
| Princetown Mews Management Company Limited | Households | 2006 |
| Princetown Park Management Company Limited | Households | 2025 |
| Princetown Properties Limited | Real estate | 1978 |
| Print and Peel Ltd | Manufacturing | 2025 |
| Priority International Limited | Extraterritorial | 2019 |
| Priority Investigations Limited | Extraterritorial | 2013 |
| Priority Process Limited | Extraterritorial | 2022 |
| Pritchard Asset Management CYF | Real estate | 2021 |
| Pritchard Johnson Enterprises Limited | Real estate | 2018 |
| Pritchard's Martial Arts Bangor Ltd | Education | 2019 |
| Private Dining by Joery Castel Ltd | Hospitality | 2021 |
| Private Health Insurance Services Ltd | Financial services | 2009 |
| Pro Fashion Consulting Ltd | Wholesale & retail | 2023 |
| Probit Ltd | Information & communication | 2010 |
| Professional Fabrication Services Ltd | Construction | 2009 |
| Project Pineapple Ltd | Other services | 2022 |
| Properdee Holdings Ltd | Real estate | 2020 |
| Propkey Management Ltd | Households | 2025 |
| Proprivo Ltd | Real estate | 2025 |
| Prospect Apartments NO 1 Limited | Households | 2024 |
| Protechni Ltd | Wholesale & retail | 2024 |
| Provident Domiciliary Care Services Ltd | Health & social care | 2024 |
| Provincewide Limited | Financial services | 1993 |
| Proweld Fabrication (Wales) Limited | Manufacturing | 2014 |
| PS Lowry Rental Ltd | Real estate | 2023 |
| PSG Bangor Ltd | Real estate | 2025 |
| Psychni Ltd | Health & social care | 2021 |
| Pubs Clubs & Interiors Ltd | Construction | 2018 |
| Pulse Rental Ltd | Real estate | 2022 |
| Putóg Ltd | Wholesale & retail | 2024 |
| PWB Hospitality Ltd | Hospitality | 2018 |
| PWC2 Limited | Arts & recreation | 2019 |
| Pwergwyrdd CYF | Manufacturing | 2015 |
| Pyper Mclarnon Partnership LLP | | 2005 |
| Q Gate Management Company Limited | Extraterritorial | 2014 |
| Q Nails & Spa 278 Limited | Other services | 2025 |
| Qanovi Mobile Phones Limited | Wholesale & retail | 2023 |
| QDM NI Limited | Other services | 2025 |
| Quality Plan Ltd | Financial services | 2007 |
| Qualityoffer Limited | Real estate | 2008 |
| Quar Court Management Company Limited | Extraterritorial | 1976 |
| Quarry Court (Helens Bay) Limited | Households | 1988 |
| Quattroson Ltd | Professional & scientific | 2026 |
| Queensfort Court Management Limited | Households | 1992 |
| Quick Crave Ltd | Hospitality | 2025 |
| Quidos Capital Ltd | Professional & scientific | 2025 |
| Quidos Investments Limited | Financial services | 2024 |
| Quigg Enterprises Ltd | Wholesale & retail | 2024 |
| Quik Cabs Limited | Transport & logistics | 2019 |
| Quill (Northern Ireland) Ltd | Real estate | 1981 |
| R & O Trading Ltd | Financial services | 2013 |
| R a Pritchard Associates Ltd | Professional & scientific | 2010 |
| R B L Couriers Ltd | Transport & logistics | 2012 |
| R J Williams Building Contractor Ltd | Construction | 2019 |
| R P O Williams Civil Engineers Limited | Construction | 2005 |
| R&Dharvest Ltd | Hospitality | 2026 |
| R&M Homes N.I. Ltd | Construction | 2017 |
| R&R Distillery Ireland Ltd | Manufacturing | 2018 |
| R. Thomas (Builders) Limited | Construction | 1988 |
| RADACONSTRUCT86 Limited | Construction | 2026 |
| Radd Brands Ltd | Manufacturing | 2023 |
| Radial Technology Ltd | Information & communication | 2017 |
| Raffworks Ltd | Professional & scientific | 2004 |
| Rahon Enterprises Limited | Hospitality | 1991 |
| Rainey Logistics Ltd | Transport & logistics | 2025 |