| Retail on Legs Ltd | Other services | 2019 |
| Retail Outsource Solutions Ltd | Wholesale & retail | 2016 |
| Retainx Ltd | Professional & scientific | 2025 |
| Retinal Imaging Limited | Health & social care | 2023 |
| Retreatwise Ltd | Information & communication | 2024 |
| Retro Ride Imports Limited | Wholesale & retail | 2019 |
| Revels IT Solutions Ltd | Information & communication | 2015 |
| Revive (N.I) Ltd | Wholesale & retail | 2018 |
| Revive Real Estate Ltd | Real estate | 2024 |
| Revive+ Ltd | Wholesale & retail | 2025 |
| Revs Tools Ltd | Wholesale & retail | 2024 |
| Revyv Clinic Limited | Health & social care | 2026 |
| RF Bricklaying Ltd | Construction | 2016 |
| RF Distributions Ltd | Wholesale & retail | 2025 |
| RG Decorators Rathfriland Ltd | Construction | 2017 |
| RG Food Ltd | Hospitality | 2017 |
| RGM Contracts Ltd | Agriculture & fishing | 2018 |
| RH Bricklaying Limited | Construction | 2021 |
| RHH Ltd | Financial services | 2023 |
| Rhino and Partners Ltd | Wholesale & retail | 2026 |
| Rialla Property Ltd | Real estate | 2022 |
| Rich Baking RB Ltd | Manufacturing | 2024 |
| Ridgecross Express L.P. | | 2015 |
| Rigond Business LP | | 2015 |
| Ring of Gullion Cycle Hire Ltd | Wholesale & retail | 2017 |
| Rio's 22 Ltd | Hospitality | 2022 |
| Riskassert Ltd | Information & communication | 2022 |
| Rite Fitness Ltd | Arts & recreation | 2013 |
| River Lodge Hilltown Management Ltd | Households | 2021 |
| Riverhill Apartments Management Company Limited | Real estate | 2008 |
| Riverhill Development Management Company Limited | Households | 2007 |
| Riverview Meadows Management Company Limited | Households | 2005 |
| Rivval UK Limited | Administrative & support | 2018 |
| RJC (IRE) Ltd | Construction | 2018 |
| RJM Formworks Ltd | Construction | 2022 |
| RJM Shuttering Ltd | Construction | 2014 |
| RJT Retail Ltd | Wholesale & retail | 2023 |
| RJW Windows Ltd | Construction | 2024 |
| RK Marketing Ltd | Professional & scientific | 2012 |
| RK Savalbeg Estates Ltd | Real estate | 2026 |
| RKD Consulting Ltd | Information & communication | 2026 |
| RKH Medical Ltd | Health & social care | 2019 |
| Rkingscompetitions Ltd | Arts & recreation | 2018 |
| RKO Developments Limited | Real estate | 2011 |
| RKT Assets L.P. | | 2017 |
| RL Properties Services Ltd | Health & social care | 2015 |
| RM & TS Media Ltd | Administrative & support | 2023 |
| RM Autoparts Ltd | Wholesale & retail | 1991 |
| RM Fuels Limited | Wholesale & retail | 2018 |
| RM Plumbing & Tiling Ltd | Construction | 2022 |
| RM Window Blinds Mcallister Interiors Ltd | Manufacturing | 2008 |
| RMA Recycling Limited | Water & waste | 2011 |
| RMB Livestock Haulage Ltd | Transport & logistics | 2015 |
| RMC Building Contracts Ltd | Construction | 2022 |
| RMC Group Holdings Ltd | Real estate | 2018 |
| Rmca Joinery & Maintenance Ltd | Construction | 2026 |
| Rmcl Limited | Health & social care | 2023 |
| Rmhc Limited | Professional & scientific | 2017 |
| RMK Engineering Ltd | Construction | 2020 |
| RML Properties Ltd | Real estate | 2025 |
| Rnwx Engineering Ltd | Manufacturing | 2025 |
| Road Empire Limited | Wholesale & retail | 2015 |
| Road Safety & Vehicle Repair Improvement NI CIC | Professional & scientific | 2016 |
| Road Stud Installations Ltd | Construction | 2013 |
| Roadrunner App Limited | Information & communication | 2019 |
| Roadwell Homes Limited | Real estate | 2024 |
| Roadwell Limited | Financial services | 2018 |
| Robert John (BOB) Mckeown Limited | Extraterritorial | 2023 |
| Robert Roberts (NI) Limited | Manufacturing | 2002 |
| Robert Walsh (Builders) Limited | Construction | 1979 |
| Robert Watson Limited | Agriculture & fishing | 2005 |
| Robert Wilson Electrics Ltd | Construction | 2020 |
| Robson Family Karate Limited | Arts & recreation | 2017 |
| Robyn Dent Limited | Education | 2021 |
| ROC Attractions Ltd | Arts & recreation | 2018 |
| Rock Builders Ltd | Construction | 2003 |
| Rock N Roll Mama Media Ltd | Professional & scientific | 2026 |
| Rockfield Farming Limited | Agriculture & fishing | 2018 |
| Rockfield Hall Management Company Ltd | Households | 2014 |
| Rockmount Holdings Ltd | Financial services | 2025 |
| Rocksouth NI Ltd | Wholesale & retail | 2025 |
| Rocktown Enterprises Limited | Professional & scientific | 2020 |
| Rockview Seafoods Ltd | Hospitality | 2023 |
| Rockwood Engineers Ltd | Professional & scientific | 2013 |
| Rocky O'Reilly Productions Ltd | Information & communication | 2019 |
| ROCO9 Ltd | Manufacturing | 2020 |
| Rodgers Builders & Electrical Ltd | Construction | 2019 |
| Rodgers Commercial Vehicles Limited | Administrative & support | 2015 |
| Rodgers Properties Limited | Real estate | 2015 |
| Rodo Group Ltd | Construction | 2018 |
| ROE Contracts Ltd | Construction | 2023 |
| Roelle Extensions Ltd | Other services | 2015 |
| Rogers Solicitors Limited | Professional & scientific | 2026 |
| Rogsol Service Company Limited | Professional & scientific | 2015 |
| ROH Car Care Ltd | Wholesale & retail | 2020 |
| ROI Competitions Ltd | Arts & recreation | 2025 |
| ROK Consultancy Ltd | Energy | 2016 |
| ROK Engineering and Fabrication Ltd | Wholesale & retail | 2022 |
| Romas Newtownards Ltd | Hospitality | 2025 |
| Ronan Byrne Electrical Limited | Energy | 2017 |