| Posability Ltd | Information & communication | 2014 |
| Poundhill Land Management Co Ltd | Households | 2018 |
| Powdertek Coatings Limited | Manufacturing | 2022 |
| Precon NI Ltd | Professional & scientific | 2023 |
| Preplan 3D Limited | Professional & scientific | 2016 |
| Prestige Automotive (N.I.) Ltd | Wholesale & retail | 2024 |
| Primrose Lane Management Ltd | Households | 2022 |
| Primrose Mews Management Ltd | Households | 2020 |
| Princess Way Heights Management Co Ltd | Households | 2014 |
| PRO3 Pipeline Fusion Ltd | Construction | 2017 |
| Project Steward Ltd | Professional & scientific | 2025 |
| Properties Trade Limited | Manufacturing | 2024 |
| Prosody Limited | Administrative & support | 1993 |
| Prospect Estates Management Limited | Extraterritorial | 2001 |
| Providing Hope and Light | Health & social care | 2019 |
| PT Science Ltd | Education | 2026 |
| Pukka Industries Ltd | Information & communication | 2023 |
| Quantum Automotiveni Ltd | Wholesale & retail | 2021 |
| R & D Laboratories Limited | Manufacturing | 1995 |
| R L R Approvals Limited | Other services | 2025 |
| R S Carmichael Haulage Ltd | Transport & logistics | 2012 |
| R&K Blair Ltd | Wholesale & retail | 2026 |
| Ragin Bull Ltd | Hospitality | 2022 |
| Rainoss Ltd | Energy | 2012 |
| RAM Commerce Limited | Wholesale & retail | 2023 |
| Randalstown Apartments Management Ltd | Households | 2021 |
| Rashee Co Ltd | Households | 2011 |
| Rashee Holdings Ltd | Construction | 2019 |
| Rashee Road Management Co. NO 2 Ltd | Households | 2011 |
| Ravel Manor Management Company Limited | Extraterritorial | 2004 |
| RBF Property Investments Ltd | Real estate | 2024 |
| RDC Windtech Energy Services Ltd | Professional & scientific | 2019 |
| RDD Management Solutions Ltd | Professional & scientific | 2024 |
| Readers Park 1968 Limited | Extraterritorial | 2015 |
| Reaper Inc Ltd | Wholesale & retail | 2023 |
| Recoa Developments Limited | Construction | 2021 |
| Rectory Park Property Management Co Ltd | Households | 2022 |
| Red Blox Ltd | Real estate | 2023 |
| Red Blue Green Ltd | Wholesale & retail | 2020 |
| Redo Solutions NI Limited | Construction | 1978 |
| Refmec Ltd | Construction | 2021 |
| Regents Court (Newtownards) Limited | Households | 2001 |
| Reid Black Solicitors Limited | Professional & scientific | 2012 |
| Revolution AV Ltd | Information & communication | 2017 |
| Rewrite the Script Ltd | Other services | 2021 |
| RGM Topco Limited | Financial services | 2021 |
| RGM Vent Limited | Professional & scientific | 2010 |
| Rh&M Property NI Ltd | Real estate | 2026 |
| Rhanbuoy Point Management Ltd | Extraterritorial | 2011 |
| River Hill Management Company Ltd | Households | 2015 |
| Riverdale Land Management Ltd | Extraterritorial | 2006 |
| Riversdale Enterprises Limited | Professional & scientific | 2017 |
| Riversdale Wagyu Limited | Agriculture & fishing | 2023 |
| Riverside Cottages Management Services Limited | Extraterritorial | 1999 |
| Riverside Court (Ballyclare) Management Ltd | Households | 2025 |
| Riverside Mews Residential Management Company Limited | Households | 2014 |
| Riverwatch Management Limited | Extraterritorial | 1999 |
| RJB Technical Consultancy Limited | Professional & scientific | 2016 |
| RKM Business Solutions NI Limited | Professional & scientific | 2023 |
| Roadtoantrim Management Limited | Extraterritorial | 2001 |
| Robert a Duncan & Co Ltd | Wholesale & retail | 2003 |
| Robert Hutchinson Consultancy Ltd | Professional & scientific | 2023 |
| Robin Bates Dog Training Ltd | Agriculture & fishing | 2026 |
| Robinson Electrical & Boiler Services Ltd | Construction | 2026 |
| Robson Park Land Management Ltd | Households | 2026 |
| Rocke Construction Ltd | Construction | 2018 |
| Rockland View Management Ltd | Households | 2019 |
| Roddens Manor Management Company Ltd | Households | 2019 |
| Roddens Services Limited | Households | 2000 |
| Rogan Manor Management Limited | Extraterritorial | 2000 |
| Ronan Manor Land Management Ltd | Extraterritorial | 2002 |
| ROO Cafe Ltd | Hospitality | 2024 |
| Rose Gardens Apartments Management Company Limited | Extraterritorial | 1999 |
| Ross Management Company Limited | Households | 2002 |
| Rosslane Property Management Company Limited | Extraterritorial | 2009 |
| ROY Coulter Consulting Ltd | Professional & scientific | 2012 |
| RPD K9 Ltd | Other services | 2025 |
| Rylandale Holdings Ltd | Financial services | 2020 |
| S & C Wholesale LLP | | 2010 |
| S C Clarke Assessors Ltd | Financial services | 2024 |
| Sable + Suede Ltd | Wholesale & retail | 2026 |
| Safe Places Security Solutions Ltd | Administrative & support | 2025 |
| Sage Finance (N.I.) Limited | Financial services | 2016 |
| Saint Inns Management Company (Phase 2) Limited | Households | 2004 |
| Saint-Gobain Omega NI Ltd | Extraterritorial | 1890 |
| Salmon Leap Limited | Households | 2007 |
| Samesies Ltd | Health & social care | 2022 |
| Sandmount Land Management Ltd | Extraterritorial | 2002 |
| Sarcon 71 Ltd | Wholesale & retail | 2022 |
| Savvy & Shine Ltd | Wholesale & retail | 2010 |
| Scheduled Inspection Maintenance Services Ltd | Manufacturing | 2016 |
| Scholar's Court Dromore Management Limited | Households | 2008 |
| Schooby Limited | Wholesale & retail | 2005 |
| School House Lane Management Ltd | Households | 2022 |
| Scotch Quarter Management (Carrickfergus) Limited | Households | 2023 |
| SDE (Properties & Booth Cleaning) Limited | Real estate | 2005 |
| SDE Decorators Ltd | Real estate | 2000 |
| SE7ENS Car Hire Ltd | Hospitality | 2021 |
| Security Solutions (I) Ltd | Administrative & support | 2018 |
| Sellyourcartojax.Com Ltd | Wholesale & retail | 2021 |