| Ralp Ltd | Real estate | 2023 |
| Ramsay's Fine Foods Ltd | Hospitality | 2022 |
| Randal Anaesthetics Ltd | Health & social care | 2024 |
| Randalls Road Leatherhead Limited | Construction | 2021 |
| Rascals Cafe Bar Ltd | Hospitality | 2011 |
| Rash-Rad Diagnostics Ltd | Health & social care | 2023 |
| Rathgael Gymnastics and Tumbling Club | Arts & recreation | 2012 |
| Rathmore Stores Ltd | Wholesale & retail | 2010 |
| RAVEN8 Ltd | Hospitality | 2026 |
| Ravens Hawk Ltd | Information & communication | 2018 |
| Raymond I Fair Landscapes Ltd | Administrative & support | 2006 |
| RB Juice Disctro Ltd | Wholesale & retail | 2019 |
| RBA Electrical Engineering Ltd | Construction | 2025 |
| RD Sports & Performance Ltd | Wholesale & retail | 2024 |
| RDA Global Limited | Construction | 2016 |
| RDA International Ltd | Manufacturing | 2019 |
| RDA Project Development Ltd | Construction | 2014 |
| RDA Property Limited | Construction | 2014 |
| Rdrni Ltd | Real estate | 2021 |
| Real Aesthetics N.I. Ltd | Other services | 2016 |
| Reconnect and Recentre Ltd | Administrative & support | 2022 |
| Recycleworks Ltd | Wholesale & retail | 2025 |
| Red Chilli (N.I.) Limited | Hospitality | 2023 |
| Red Property Gwynedd Ltd | Real estate | 2025 |
| Red ROW Associates Ltd | Professional & scientific | 2014 |
| Redbay Developments Limited | Construction | 1985 |
| Redbay Holdings Limited | Construction | 2019 |
| Redburn Design Ltd | Professional & scientific | 2018 |
| Redwood (Cedars) Management Limited | Extraterritorial | 1987 |
| Redwood (Firs) Management Limited | Extraterritorial | 1985 |
| Redwood (Pines) Management Limited | Extraterritorial | 1985 |
| Refinished Ltd | Construction | 2022 |
| Regal Plastering Limited | Construction | 1992 |
| Regency Square Management Company Limited | Households | 2002 |
| Rejuve Health and Wellbeing Limited | Health & social care | 2021 |
| Rekb Ltd | Other services | 2023 |
| Relic Plastic CIC | Manufacturing | 2019 |
| Relm Construction Ltd | Extraterritorial | 2025 |
| Relm Group Ltd | Construction | 2018 |
| Remakery Studio Ltd | Education | 2024 |
| Rend Collective Experiment Ltd | Information & communication | 2009 |
| Rendtek Ltd | Construction | 2017 |
| Residents of 162 Seacliff Road Property Management Company Limited | Households | 2025 |
| Resilient Planet Ltd | Professional & scientific | 2019 |
| Resilient Planit Ltd | Information & communication | 2021 |
| Respiratoryni Ltd | Health & social care | 2022 |
| Retrosports Ltd | Wholesale & retail | 2025 |
| Revolution Bikes Ltd | Wholesale & retail | 2007 |
| Rhys Owen Ltd. | Health & social care | 2023 |
| Riada Holdings Ltd | Real estate | 2024 |
| Ribride Boat Tours Limited | Extraterritorial | 2019 |
| Rich Evans Plumbing and Heating Ltd | Construction | 2024 |
| Ricky Mobile Mechanic and Diagnostics Ltd | Manufacturing | 2022 |
| Rider Training Bangor Limited | Education | 2026 |
| Riley S Bates Limited | Professional & scientific | 2022 |
| Rinse and Revive Ltd | Administrative & support | 2025 |
| Ripe Properties & Rentals Ltd | Extraterritorial | 2023 |
| Riscon Limited | Arts & recreation | 2006 |
| Rivalreveal Ltd | Professional & scientific | 2025 |
| Riverwood Court Management Company Limited | Extraterritorial | 2004 |
| RJC Catering Service Ltd | Hospitality | 2026 |
| Rkbg Ltd | Hospitality | 2026 |
| RM Dermatology Ltd | Health & social care | 2025 |
| RM Tubing Services Limited | Professional & scientific | 2015 |
| RN Kitchens Ltd | Hospitality | 2026 |
| Rntlni Limited | Real estate | 2016 |
| Roam Group Ltd | Extraterritorial | 2022 |
| Roaming Knights Ltd | Information & communication | 2024 |
| Robert Craig Consulting Ltd | Professional & scientific | 2023 |
| Robert Harrison Limited | Wholesale & retail | 2025 |
| Robert M Jones Ltd | Construction | 2007 |
| Robert Russell Contracts Ltd | Construction | 2017 |
| Roberts & Owen Limited | Wholesale & retail | 2014 |
| Roberts Brothers Toilet Hire Ltd | Administrative & support | 2024 |
| Roberts of Bangor Limited | Wholesale & retail | 2016 |
| Robertson Heating Services NW Limited | Construction | 2024 |
| Robin Gordon Limited | Health & social care | 2025 |
| Robinson Park Limited | Extraterritorial | 1979 |
| Rock Developments Limited | Construction | 2011 |
| Rockhill (Lisburn) Limited | Real estate | 2013 |
| Rockhill Holdings Limited | Real estate | 1984 |
| Rockhouse (N.I.) Limited | Other services | 2016 |
| Rockingham Street Student Limited | Construction | 2016 |
| Rockpool Insights Ltd | Professional & scientific | 2018 |
| Rockvale Limited | Hospitality | 2011 |
| Roebuck Developments Limited | Construction | 2013 |
| Rogpat Management Ltd | Professional & scientific | 2019 |
| Roll Narrative Ltd | Wholesale & retail | 2026 |
| Rolling Retreats Ltd | Administrative & support | 2024 |
| Rondo Clothing Limited | Wholesale & retail | 2024 |
| Rose & Maple Limited | Real estate | 2018 |
| Rose Heating Ltd | Construction | 2023 |
| Rosebery Wine Limited | Wholesale & retail | 2011 |
| Rosepark Lodge Management Company Limited | Extraterritorial | 2001 |
| Rosie Green Lounge Ltd | Other services | 2025 |
| Rossdowan Court Management Company Limited | Extraterritorial | 2010 |
| Rossdowan Lane Management Company Limited | Extraterritorial | 2018 |
| Rossetto & Co Ltd | Professional & scientific | 2025 |
| Roundell Limited | Wholesale & retail | 2017 |
| Rowanvale Limited | Information & communication | 2001 |