| RBH Sharia Limited | Hospitality | 2026 |
| RDM Lettings Ltd | Real estate | 2021 |
| RE Woolsey & Sons Limited | Manufacturing | 1987 |
| Reach Mentoring Ltd | Education | 2014 |
| Reader Developments Limited | Construction | 2021 |
| Rebecca Troughton Eyecare Ltd | Health & social care | 2019 |
| Reclaim (Waste) Limited | Extraterritorial | 1983 |
| Red Square Facilities Ltd | Administrative & support | 2026 |
| Redbone Properties Ltd | Real estate | 2011 |
| Redhead Conference & Exhibition Limited | Manufacturing | 2012 |
| Redman Solicitors Limited | Professional & scientific | 2014 |
| Reduction Plastics Ltd | Manufacturing | 2005 |
| Reef Fencing Projects Limited | Administrative & support | 2016 |
| Reesemac Limited | Hospitality | 2018 |
| Refan Portadown Limited | Wholesale & retail | 2018 |
| Reform & Flow Pilates Ltd | Arts & recreation | 2024 |
| Reformer LAB Limited | Arts & recreation | 2024 |
| Refrigeration Service NI Limited | Manufacturing | 2014 |
| Regal Leisure N.I. Ltd | Arts & recreation | 2010 |
| Regco Ltd | Professional & scientific | 2021 |
| Regency Wood Kitchens and Bedrooms Limited | Manufacturing | 2020 |
| Regents Park (Ards) Apartments Management Ltd | Households | 2023 |
| Relevé Events Ltd | Arts & recreation | 2026 |
| Reliables Cars Ltd | Wholesale & retail | 2025 |
| Rent a Spa (NI) Ltd | Administrative & support | 2024 |
| REP & Wreck Fitness Ltd | Arts & recreation | 2025 |
| REP Room Ltd | Arts & recreation | 2025 |
| Reportly AI Ltd | Information & communication | 2025 |
| Reset Factory Ltd | Health & social care | 2026 |
| Resonate Arts Ltd | Arts & recreation | 2024 |
| Retain Consultancy Ltd | Information & communication | 2025 |
| Revabysafa Limited | Other services | 2021 |
| Revive DRY Cleaning Ltd | Other services | 2025 |
| Rexcleaning Limited | Administrative & support | 2025 |
| Rhiannon's Cakes and Bakes Ltd | Manufacturing | 2022 |
| Ricapa Holdings Ltd | Real estate | 2020 |
| Ricapa Ltd | Administrative & support | 2022 |
| Richard Metcalfe Enterprises Ltd | Real estate | 1979 |
| Richhill Agri Services Ltd | Agriculture & fishing | 2019 |
| Richmount Rural Community Association Ltd | Manufacturing | 2024 |
| Rigg Holdings Ltd | Real estate | 2024 |
| Right Price Tiles Ltd | Extraterritorial | 2015 |
| Right Track N.I. Ltd | Administrative & support | 2011 |
| Rigid Mixers Ltd | Manufacturing | 2017 |
| Ringcross Limited | Extraterritorial | 2004 |
| Ringflow Consulting Ltd | Professional & scientific | 2026 |
| Ripley Chat Ltd | Information & communication | 2018 |
| Riverdale Court Management Co (NI) Ltd | Households | 2003 |
| Riverglade Land Management 2 Ltd | Real estate | 2017 |
| Riverglade Land Management Ltd | Real estate | 2003 |
| Riverside Beauty & Wellbeing Ltd | Other services | 2019 |
| RJ Woolsey (Concrete) Limited | Financial services | 2015 |
| RKL Developments Limited | Construction | 1994 |
| RLS Construction and Joinery Ltd | Construction | 2024 |
| RM Car Rentals Ltd | Administrative & support | 2014 |
| RMC Autos & Recovery Ltd | Wholesale & retail | 2024 |
| Rmcclean Ltd | Transport & logistics | 2021 |
| RMG Furniture Ltd | Manufacturing | 2017 |
| RMM Aesthetics Ltd | Other services | 2021 |
| RNR Rentals Ltd | Real estate | 2024 |
| Road 19-73 Ltd | Transport & logistics | 2025 |
| Roadside Motors (Lurgan) Limited | Wholesale & retail | 1991 |
| Roadside Motors (Moneymore) Limited | Wholesale & retail | 1991 |
| Roadside Motors Limited | Wholesale & retail | 1974 |
| Roam Socks Ltd | Wholesale & retail | 2026 |
| Robert Hall Software Limited | Information & communication | 2021 |
| Robert Rush Limited | Construction | 2014 |
| Roberts Print Engineering Limited | Manufacturing | 2022 |
| Robinson & Company Limited | Professional & scientific | 2006 |
| Robinson Bros Limited | Administrative & support | 2026 |
| Rock House Engineering Ltd | Professional & scientific | 2017 |
| Rockcastle Group Ltd | Financial services | 2024 |
| Rockcastle Management Ltd | Construction | 2023 |
| Roland Service Ltd | Administrative & support | 2025 |
| Romeo and Julian Publications Ltd | Manufacturing | 2018 |
| Romtech Limited | | 2006 |
| Ronald Halliday Limited | Wholesale & retail | 2025 |
| Rooney Auto Services Ltd | Wholesale & retail | 2025 |
| Rooney Electrical NI Ltd | Construction | 2025 |
| ROPES4REAYAH Ltd | Construction | 2022 |
| Rory Best Rugby Limited | Arts & recreation | 2008 |
| Rosbotham Demolition Limited | Construction | 2002 |
| Rose Cottage Holdings Ltd | Financial services | 2019 |
| Rose Farm B&B Ltd | Construction | 2019 |
| Rossmoyle Trading Limited | Professional & scientific | 2005 |
| Round Pond Holdings Limited | Financial services | 2026 |
| Rowanwood Investments Limited | Real estate | 2022 |
| Roxborough Manor Management Company Ltd | Households | 2018 |
| ROY Kennedy (Fuels) Ltd | Wholesale & retail | 2009 |
| RP Coaches Limited | Transport & logistics | 2024 |
| RPF Building & Joinery Ltd | Construction | 2026 |
| Rpni Events Ltd | Arts & recreation | 2021 |
| RTH Logistics Limited | Transport & logistics | 2025 |
| Runsmart Consultancy Limited | Professional & scientific | 2025 |
| Rural Coffee HUT Ltd | Hospitality | 2025 |
| Rush Vapes Ltd | Wholesale & retail | 2024 |
| Rushmerepost Ltd | Transport & logistics | 2026 |
| Russell Mcnally Ltd | Information & communication | 2024 |
| Rust & Ribbon Ltd | Wholesale & retail | 2024 |
| Rutledge Property Solutions Ltd | Administrative & support | 2015 |