| Professional Video Productions Limited | Information & communication | 2023 |
| Profex Construction L.P. | | 2017 |
| Profi Elektro Service SL Ltd | Professional & scientific | 2021 |
| Projah Ltd | Information & communication | 2024 |
| Promac Projects Ltd | Wholesale & retail | 2015 |
| Promark Impex L.P. | | 2016 |
| Pronto Engineering Group Limited | Construction | 2015 |
| Proof (N.I.) Limited | Manufacturing | 2023 |
| Properties J&A Ltd | Households | 2020 |
| Property Advertising Limited | Professional & scientific | 2015 |
| Property Solutions Ayrshire Limited | Construction | 2011 |
| Property Stop Homes Ltd | Information & communication | 2019 |
| Propertyform Ltd | Construction | 2023 |
| Propertyrepairsni.Com Limited | Professional & scientific | 2010 |
| Propsandvintage North Ltd | Arts & recreation | 2013 |
| Prospect Home Developments Ltd | Real estate | 2004 |
| Prospects Solution Ltd | Health & social care | 2025 |
| Prototrade L.P. | | 2015 |
| Proules Limited | Professional & scientific | 2022 |
| Proviso IT Ltd | Information & communication | 2019 |
| Pruk Operator Ltd | Hospitality | 2014 |
| PS Formworks Ltd | Construction | 2023 |
| PS Properties (N.I.) Ltd | Real estate | 2018 |
| PSC Biotech Limited | Professional & scientific | 2014 |
| Psfh Properties Ltd | Real estate | 2018 |
| PSG Smart Homes Ltd | Construction | 2018 |
| Psmm Holdings Ltd | Financial services | 2024 |
| PST Sport (UK) Limited | Administrative & support | 2016 |
| PT Brickwork Ltd | Construction | 2022 |
| Pulse 28 Ltd | Arts & recreation | 2026 |
| Pulse Imaging Ltd | Health & social care | 2026 |
| Pumps & Fuels Installations (NI) Limited | Manufacturing | 2015 |
| Purdy Estates Limited | Construction | 2025 |
| Purdy Quinn Limited | Professional & scientific | 2017 |
| Pure Aesthetics Clinic Limited | Health & social care | 2018 |
| Pure Engineering Group Ltd | Construction | 2015 |
| Pure Hill Limited | Wholesale & retail | 2024 |
| Puredrop Ltd | Information & communication | 2010 |
| Purple Skye Limited | Hospitality | 2020 |
| PUT Your Health First Ltd | Wholesale & retail | 2025 |
| PWC Surveying Limited | Professional & scientific | 2018 |
| Péarlaí Ltd | Information & communication | 2016 |
| Qdes Limited | Professional & scientific | 2020 |
| Qemdr Ltd | Health & social care | 2023 |
| Qian PIN Express Ltd. | Wholesale & retail | 2016 |
| QM Developments (IRE) Ltd | Construction | 2015 |
| QM Electrical Ltd | Manufacturing | 2019 |
| QM Group Limited | Construction | 2020 |
| QME Mining Services (NI) Limited | Mining & quarrying | 2014 |
| Qpat Trading Ltd | Professional & scientific | 2021 |
| QR Accountants Limited | Professional & scientific | 2021 |
| Quaker Green Management Company Limited | Households | 2005 |
| Quality Timber Frame Services Ltd | Manufacturing | 2013 |
| Quantum Safety Consultancy Ltd | Professional & scientific | 2020 |
| Quarry Masonary Ltd | Construction | 2025 |
| Quay Dog Ltd | Manufacturing | 2020 |
| Quay Plant Rentals & Sales Ltd | Wholesale & retail | 2020 |
| Quaypoint Security Ltd | Administrative & support | 2019 |
| Quigley Holdings Limited | Financial services | 2017 |
| Quigley Transport Ltd | Transport & logistics | 2025 |
| Quinn Agricultural Contracting Ltd | Agriculture & fishing | 2014 |
| Quinn Building & Restoration Ltd | Construction | 2025 |
| Quinn Carpets Limited | Wholesale & retail | 2019 |
| Quinn Coaches Limited | Transport & logistics | 2012 |
| Quinn Farms Ltd | Agriculture & fishing | 2023 |
| Quinn Haulage Limited | Transport & logistics | 2022 |
| Quinn Holdings Ltd | Financial services | 2025 |
| Quinn Industrial Services Ltd | Administrative & support | 2021 |
| Quinn International Transport Ltd | Transport & logistics | 2022 |
| Quinn Motor Services Ltd | Wholesale & retail | 2012 |
| Quinn Recovery Ltd | Wholesale & retail | 2019 |
| Quinnmech Limited | Construction | 2025 |
| QUO Vadis Fishing Company Limited | Real estate | 1985 |
| R & J MAC Limited | Wholesale & retail | 2020 |
| R Blockwork Limited | Construction | 2025 |
| R Crilly Construction Services Ltd | Administrative & support | 2021 |
| R Hanna Contracts Ltd | Construction | 2017 |
| R Mcardle Contracts Ltd | Construction | 2018 |
| R Mcshane Haulage Limited | Transport & logistics | 2025 |
| R O'Neill Electrical Contracts Limited | Construction | 2023 |
| R&C Accountants & Management Limited | Professional & scientific | 2020 |
| R&E Amusements Ltd | Arts & recreation | 2012 |
| R&E Carpentry Ltd | Construction | 2021 |
| R&G Haulage Ltd | Transport & logistics | 1999 |
| R&R Auto Sales and Service Ltd | Wholesale & retail | 2023 |
| R&S Sons Limited | Hospitality | 2024 |
| R.D. Dataworx Limited | Construction | 2023 |
| R.E.L Brick Specialists Ltd | Construction | 2022 |
| R.J. Sterritt Limited | Wholesale & retail | 2010 |
| R.S. Systems (N.I.) Limited | Information & communication | 2004 |
| R.W. Toase Limited | Administrative & support | 1949 |
| R66 Property Ltd | Real estate | 2026 |
| RA Mcatee Limited | Wholesale & retail | 2025 |
| Racar (N.I.) Ltd | Construction | 2020 |
| Rafferty & Tomany Ltd | Construction | 2018 |
| Rafferty Consultancy Ltd | Professional & scientific | 2017 |
| Rafferty Paint Supplies Ltd | Wholesale & retail | 2021 |
| Rafferty Solicitors (Newry) Limited | Professional & scientific | 2013 |
| Rafftest Ltd | Construction | 2024 |
| Railroad Energy Ltd | Professional & scientific | 2015 |