| Plack Properties Ltd | Real estate | 2026 |
| Plumb Vent Ltd | Wholesale & retail | 2020 |
| PM Epoxy Ltd | Construction | 2026 |
| PM Hair Group Ltd | Other services | 2026 |
| PM Hair Ltd | Other services | 2026 |
| PMC Electrical Engineering Limited | Manufacturing | 2019 |
| Pmga Properties Limited | Construction | 2025 |
| Polemic Ltd | Information & communication | 2016 |
| PR Racking Inspections Ltd | Professional & scientific | 2020 |
| Predict 7 Group Limited | Information & communication | 2025 |
| Premier Plaster Mouldings Ltd | Construction | 2017 |
| Premier Protective Coatings Limited | Wholesale & retail | 2016 |
| Prestige Metal Solutions Ltd | Construction | 2023 |
| Prime Power Generation Ltd | Energy | 2024 |
| Priory Plant Ltd | Administrative & support | 2024 |
| Profitec Solutions Ltd | Construction | 2009 |
| Progressive Fitness & Physiotherapy Limited | Public administration | 2021 |
| Project Tiling Ltd | Manufacturing | 2022 |
| Proline Mechanical Ltd | Construction | 2023 |
| Prologic Data Management Limited | Information & communication | 1996 |
| PT Electrics Ltd | Construction | 2025 |
| PVC Windows Spares and Repairs Ltd | Construction | 2025 |
| Qchemicals Limited | Manufacturing | 2020 |
| Quantum Cleaning Solutions Ltd | Administrative & support | 2015 |
| Quinair Heat Recovery NI Ltd | Construction | 2013 |
| Quindon Ltd | Water & waste | 2007 |
| Quinn 3 Limited | Wholesale & retail | 2010 |
| Quinn Silage Limited | Agriculture & fishing | 2012 |
| Quinns Gelato Limited | Manufacturing | 2013 |
| R & G Kitchen Designs Limited | Manufacturing | 2017 |
| R & M Greenkeeper Ltd | Manufacturing | 2006 |
| R & M Skip Hire Limited | Extraterritorial | 2014 |
| R B Mcgeary Contracts Ltd | Construction | 2008 |
| R Bell Joinery Ltd | Construction | 2014 |
| R L Hewitt Ltd | Wholesale & retail | 2022 |
| R Mcallister Tractors Ltd | Wholesale & retail | 2012 |
| R S Falcons Limited | Agriculture & fishing | 2022 |
| R&C Loughran Ltd | Wholesale & retail | 2025 |
| R&K Property & Developments Ltd | Real estate | 2026 |
| Rafferty's Contract Furniture Ltd | Manufacturing | 2024 |
| Rags in Bags Ltd | Wholesale & retail | 2002 |
| Railway View Farm Ltd | Agriculture & fishing | 2012 |
| Rapayd Limited | Professional & scientific | 2018 |
| Rapid Business Solutions Limited | Professional & scientific | 2019 |
| Rapidwall Ltd | Manufacturing | 2004 |
| Rapsand Ltd | Real estate | 2013 |
| RAW Industrial and Quarry Services Ltd | Manufacturing | 2025 |
| Raygar Ltd | Wholesale & retail | 2011 |
| Raymond Turkington (Decorations) Limited | Wholesale & retail | 1977 |
| Raymond Turkington (Furnishings) Limited | Real estate | 1988 |
| Razorsharp Ltd | Other services | 2021 |
| Re:Sure Intelligence Ltd | Administrative & support | 2007 |
| Reagalmac Limited | Construction | 1985 |
| Reagh Sand Ltd | Administrative & support | 2023 |
| Reamar Properties Limited | Construction | 1985 |
| Red Tulip Drive Company Limited | Professional & scientific | 2024 |
| Redwood Green Limited | Financial services | 2025 |
| Regal Competitions Ltd | Wholesale & retail | 2019 |
| Regal Furniture Company Limited | Wholesale & retail | 1969 |
| Regan Building Contractors Ltd | Construction | 2016 |
| Reid Bros Sand & Gravel Ltd | Mining & quarrying | 2019 |
| Reid International Transport Limited | Transport & logistics | 2023 |
| Reid Motors Ltd | Wholesale & retail | 2026 |
| Rentsure Housing Limited | Real estate | 2026 |
| Rework Properties Limited | Construction | 2013 |
| Righty Tighty Ltd | Hospitality | 2008 |
| Riverside Fuels Ltd | Wholesale & retail | 2018 |
| Rivervale Country Private Care Home LLP | | 2019 |
| RJH Farms Limited | Agriculture & fishing | 2012 |
| RMC Ground Stabilisation Ltd | Construction | 2021 |
| RMK Design Limited | Professional & scientific | 2018 |
| Rmpl Ltd | Agriculture & fishing | 2012 |
| RN (NO 190) Ltd | Real estate | 2026 |
| RNR Engineering Ltd | Wholesale & retail | 2022 |
| Robb Mechanical Services Ltd | Construction | 2010 |
| Rockmore Enclosures Ltd | Manufacturing | 2026 |
| Rose Drive Company Limited | Extraterritorial | 2025 |
| Rossmore Construction Ltd | Construction | 2020 |
| Rossmore Properties (N.I.) Ltd | Real estate | 2020 |
| RQ & FQ Properties Limited | Real estate | 2025 |
| RQ Auto Repairs Ltd | Wholesale & retail | 2025 |
| RS Property Development Ltd | Construction | 2011 |
| RT Bounce Trading Ltd | Administrative & support | 2021 |
| RT Group Holdings Ltd | Professional & scientific | 2024 |
| RTC Engineering Ltd | Manufacturing | 2005 |
| RUA Equine Holdings Limited | Financial services | 2026 |
| RUA Equine Ltd | Professional & scientific | 2024 |
| Rural Action | Administrative & support | 2019 |
| Rural Support | Health & social care | 2002 |
| Rycam Holdings Limited | Financial services | 2024 |
| Ryker Automotive Ltd | Administrative & support | 2016 |
| S and K Property Developments Limited | Construction | 2016 |
| S Wylie Enterprises Ltd | Wholesale & retail | 2023 |
| S.A.J.J.O.P Limited | Real estate | 2026 |
| S.S.K.C. Ltd | Real estate | 2014 |
| Sarcon (NO. 190) Limited | Construction | 2005 |
| Savoy Picture House Limited | Information & communication | 1934 |
| Sawgrass Properties Limited | Professional & scientific | 2005 |
| SBD Ireland Limited | Wholesale & retail | 2023 |
| Scandinavian Spares and Support Ltd | Wholesale & retail | 2014 |