| Quinn's (Dungannon) Ltd | Wholesale & retail | 2014 |
| R & B Haulage Contractors Limited | Transport & logistics | 2013 |
| R Irwin Ltd | Administrative & support | 2011 |
| R.J. Pattison Nutt & Sons Limited | Real estate | 1960 |
| RA Spa-Jet (Holdings) Limited | Manufacturing | 2023 |
| Raceland Europe Limited | Wholesale & retail | 2015 |
| Rafferty & Boyle Solicitors Limited | Professional & scientific | 2017 |
| Railway Sleeper Hostel Ltd | Hospitality | 2024 |
| Rainbow Property Development Ltd | Construction | 2020 |
| Raist Properties Ltd | Construction | 2024 |
| Ramaya Investments Limited | Health & social care | 2018 |
| Ramore Green Management Ltd. | Extraterritorial | 2015 |
| Ramore Property Developments Limited | Construction | 2018 |
| Ranagh Management Company Limited | Households | 2025 |
| Rashid Atiq Ltd | Wholesale & retail | 2020 |
| Raspberry Global Limited | Wholesale & retail | 2023 |
| Ratheden Management Ltd | Households | 2021 |
| Rathmore Enterprises Limited | Hospitality | 2017 |
| Rayne and ROO Ltd | Administrative & support | 2022 |
| RBG Associates Ltd | Hospitality | 2026 |
| RDA Causeway Coast & Glens Ltd | Other services | 2008 |
| RDB Architecture Ltd | Professional & scientific | 2018 |
| RDH Productions Ltd | Information & communication | 2015 |
| Rebecca Mcallister Ltd | Wholesale & retail | 2022 |
| Red Key Homes Ltd | Construction | 2015 |
| Redfox Investments Ltd | Construction | 2018 |
| Reforcetech (NI) Limited | Manufacturing | 2009 |
| Regal Bingo Ltd | Arts & recreation | 2017 |
| Relentless N.I. Ltd | Other services | 2016 |
| Renu Solutions Ltd | Professional & scientific | 2024 |
| Reussite Ltd | Manufacturing | 2023 |
| RH Joinery Ltd | Construction | 2014 |
| RHI Water Ltd | Water & waste | 2013 |
| RHM Distributions Ltd | Wholesale & retail | 2026 |
| Riada Personnel Ltd | Administrative & support | 2004 |
| Richard Patterson Motors Limited | Wholesale & retail | 2021 |
| Ringsend Farm Limited | Agriculture & fishing | 2019 |
| Rinvarna Management Company Limited | Households | 2001 |
| Ritchies Wood Management Company Limited | Households | 2006 |
| River Rhee Heritage Developments Limited | Hospitality | 2013 |
| River Ridge Energy Ltd | Water & waste | 2014 |
| River Ridge Holdings Limited | Financial services | 2016 |
| River Ridge Recycling (Belfast) Limited | Extraterritorial | 2013 |
| River Ridge Recycling (Portadown) Ltd | Water & waste | 2012 |
| Riverridge (Mallusk) Limited | Water & waste | 2020 |
| Riverside Facilities Solutions Ltd | Administrative & support | 2019 |
| Riversway Trading Limited | Extraterritorial | 2012 |
| RJ Bradley Construction Ltd | Construction | 2005 |
| RJ Production Services Limited | Information & communication | 2024 |
| RJG Ltd | Construction | 2012 |
| RJM Equipment Limited | Administrative & support | 2023 |
| RJM Plant Limited | Wholesale & retail | 2016 |
| RKC Civils Ltd | Construction | 2026 |
| RLR Property Investment Ltd | Real estate | 2021 |
| RMR Services Limited | Professional & scientific | 2017 |
| Rock Castle Management (Portstewart) Limited | Real estate | 2004 |
| Rock Holdings Ltd | Administrative & support | 2018 |
| Roevalley Developments Limited | Extraterritorial | 2007 |
| Rohdich Enterprises Limited | Wholesale & retail | 2017 |
| ROI Process Limited | Real estate | 2017 |
| Rongshengkeji Limited | Wholesale & retail | 2025 |
| Rooms Bespoke Furniture Ltd | Manufacturing | 2011 |
| Rosepark Properties Limited | Real estate | 2022 |
| Rossdale Management Company Limited | Households | 2004 |
| Rosses Development Management Limited - the | Households | 2000 |
| Rosses Lane Management Company Limited - the | Extraterritorial | 2004 |
| Rossim Limited | Construction | 2003 |
| Rosswhinny Management Ltd | Households | 2025 |
| Rotopipe Ltd | Manufacturing | 2026 |
| Roughans Portstewart Ltd | Hospitality | 2011 |
| Route Meadows Management Company Limited | Extraterritorial | 2015 |
| Royvon Plant Spares Limited | Manufacturing | 2008 |
| RPG Catering Ltd | Hospitality | 2026 |
| RRH Services Ltd | Real estate | 2024 |
| Rsjr Innovations Ltd | Other services | 2012 |
| Rupic Photography Ltd | Wholesale & retail | 2024 |
| Rutledge Recruitment & Training Ltd | Other services | 1994 |
| Rutledge Recruitment Limited | Administrative & support | 2016 |
| Rutledge Training & Recruitment Ltd | Administrative & support | 2011 |
| Rutledge Training Limited | Education | 2018 |
| S & T Moore Ltd | Wholesale & retail | 2012 |
| S J Linton Builders Limited | Construction | 2008 |
| Safe in Renewables Ltd | Professional & scientific | 2023 |
| SAFE2CARE Ltd | Extraterritorial | 2012 |
| Safer Causeway | Other services | 2000 |
| Saharper Properties Ltd | Real estate | 2024 |
| SAN Marino Management Company Limited | Households | 1998 |
| Sanctuary Manor Ltd | Real estate | 2006 |
| Sand Dune Court Management Company Limited | Households | 2001 |
| Sandelford Court Management Company Number (2) Limited | Households | 1998 |
| Sandhead Limited | Hospitality | 2001 |
| Sandi Pizza Ltd | Hospitality | 2022 |
| Sandy Lane Apartments Limited | Households | 2012 |
| Sarcon (NO. 388) Limited | Real estate | 2016 |
| Sarcon (NO. 395) Limited | Wholesale & retail | 2019 |
| Sarcon (NO. 396) Limited | Wholesale & retail | 2019 |
| Sarcon Trustees Limited | Financial services | 2017 |
| Sauna and Sea Ltd | Health & social care | 2023 |
| School PIX Ltd | Professional & scientific | 2024 |
| Score Football Centres Limited | Extraterritorial | 2012 |