| R Watson (Properties) Limited | Construction | 1926 |
| R23 Films Ltd | Information & communication | 2025 |
| RAL Leamington Ltd | Construction | 2023 |
| RDS Works Management Ltd | Professional & scientific | 2022 |
| Readers Park Development Limited | Construction | 2016 |
| Recovered ALL Limited | Construction | 2023 |
| Remember When Ltd | Administrative & support | 2013 |
| Retroni Ltd | Wholesale & retail | 2022 |
| Riverside Retail Ltd | Wholesale & retail | 2018 |
| RJ Planning Limited | Professional & scientific | 2023 |
| RJ Smyth & Associates Ltd | Professional & scientific | 2010 |
| ROB Daniel Limited | Health & social care | 2024 |
| Rocket Ventures Ltd | Manufacturing | 2017 |
| Rockport Securities Limited | Hospitality | 2001 |
| Rockwin Ltd | Real estate | 2022 |
| Rojo Consulting Ltd | Extraterritorial | 2010 |
| Rylands Holdings Ltd | Real estate | 2016 |
| S C Hanna | Water & waste | 2017 |
| SBT Ireland Ltd | Information & communication | 2023 |
| Scotframe Timber Engineering (NI) Limited | | 2006 |
| Sea Project Ltd | Extraterritorial | 2023 |
| Securibar Innovation Limited | Manufacturing | 2013 |
| Senseni Ltd | Wholesale & retail | 2024 |
| Sentrymetric Limited | Information & communication | 2022 |
| Sergio Performance Ltd | Information & communication | 2026 |
| Shaw Automation Ltd | Manufacturing | 2008 |
| Sheffield Diamonds Ltd | Wholesale & retail | 2022 |
| Shift Left Solution Ltd | Information & communication | 2021 |
| Simple Tele Ltd | Information & communication | 2020 |
| Simply Delicious Baking Limited | Manufacturing | 2015 |
| Siren Investments Limited | Real estate | 2015 |
| Siren Residences Limited | Hospitality | 2023 |
| SIX Mile Water Developments Limited | Construction | 2016 |
| Social Thread Media Ltd | Professional & scientific | 2025 |
| Solar Ireland Ltd | Wholesale & retail | 2018 |
| Stablegate Consulting Limited | Professional & scientific | 2021 |
| Stanfield (N.I.) Limited | Wholesale & retail | 1967 |
| Step 2 Developments Ltd | Real estate | 2012 |
| Stewart Ventures Limited | Real estate | 2018 |
| Stewarts of Ballymena | Real estate | 1954 |
| Stuart Mclarnin Engineering Ltd | Construction | 2022 |
| Studio Guthrie Ltd | Information & communication | 2022 |
| Sugar House Building Design and Construction Consultancy Limited | Construction | 2023 |
| Sunset Vibes Ltd | Hospitality | 2023 |
| Swank Property Ltd | Construction | 2024 |
| Synergy Community Hub Ltd | Education | 2023 |
| T & C Properties Group Limited | Real estate | 2025 |
| Tahlia Limited | Wholesale & retail | 2017 |
| Taketheleadni Ltd | Other services | 2025 |
| Tant Ltd | Financial services | 2021 |
| Tant Motors Ltd | Wholesale & retail | 2025 |
| TDL Advertising Ltd | Extraterritorial | 2020 |
| TDM Property Ltd | Real estate | 2024 |
| Tennent's NI Limited | Wholesale & retail | 1899 |
| Terberg MPM Ireland Limited | Wholesale & retail | 2013 |
| THE Alpha DAD Ltd | Arts & recreation | 2026 |
| THE Brown Bean Ltd | Manufacturing | 2025 |
| THE Daily Apron Ltd | Hospitality | 2020 |
| THE Drum Ltd | Arts & recreation | 2021 |
| THE Green Tree NO 10 Limited | Information & communication | 2020 |
| THE Hot Yoga Studio Ltd | Health & social care | 2023 |
| THE Motorist Collection Ltd | Transport & logistics | 2025 |
| THE Northern Ireland Boys' Brigade | Other services | 2023 |
| THE Retail Distribution Company - Northern Ireland Limited | Transport & logistics | 2024 |
| Theme Canvas UK Limited | Information & communication | 2026 |
| Theos Doron Ltd | Financial services | 2021 |
| Think Design Engineer Foundation | Professional & scientific | 2025 |
| Thompson Trade Ltd | Wholesale & retail | 2021 |
| Tollymore View Holdings Ltd | Hospitality | 2023 |
| Tori's Coffee, Bakes and Cakes Limited | Wholesale & retail | 2022 |
| TPM BDS Ltd | Health & social care | 2021 |
| Traditional Furniture Manufacturing Ltd | Manufacturing | 2011 |
| Trinity Investments (N.I.) Ltd | Construction | 2007 |
| Tsfni Ltd | Wholesale & retail | 2023 |
| V.P.N.M Ltd | Information & communication | 2014 |
| Vantage Health & Life Ltd | Financial services | 2018 |
| Verozen.Com Ltd | Professional & scientific | 2011 |
| Vicard Properties Limited | Real estate | 2021 |
| Visit Royal Hillsborough Ltd | Information & communication | 2026 |
| VRS Building & Maintenance Ltd | Construction | 2015 |
| VRS Property Solutions Ltd | Real estate | 2018 |
| W&M Catering Equipment Ltd | Wholesale & retail | 2019 |
| Weir Rentals Ltd | Hospitality | 2026 |
| Weir Storage Ltd | Transport & logistics | 2024 |
| Willow Tree Lane Farm Limited | Agriculture & fishing | 2019 |
| Wind Power (NI) Ltd | Energy | 2012 |
| Woodcroft Enterprise Limited | Agriculture & fishing | 2020 |
| Work Train Fit Ltd | Arts & recreation | 2020 |
| Wottaris Ltd | Real estate | 2016 |
| Xplorations Ministry | Professional & scientific | 2007 |
| Yvonne Hanvey Limited | Real estate | 1959 |
| Zooom Electrik Limited | Wholesale & retail | 2020 |