| Rathhill Property Limited | Real estate | 2018 |
| RC Enterprises Limited | Wholesale & retail | 2024 |
| RDH Plant Hire Limited | Construction | 2021 |
| Red Box Content Ltd | Information & communication | 2025 |
| Redcor Ltd | Information & communication | 2013 |
| Regal Tuning Ireland Ltd | Wholesale & retail | 2025 |
| Remote Audit Ltd | Administrative & support | 2011 |
| Residents of Coolsallagh Cottages Limited | Households | 2013 |
| Revival Movement Association-The | Information & communication | 1969 |
| Rhema Restoration Ministries | Other services | 2002 |
| Rhino Linings of Hillsborough Ltd | Manufacturing | 2025 |
| Richard Beggs Contracts Ltd | Construction | 2024 |
| River Heights Management Limited | Households | 2023 |
| RJG Contracts Ltd | Construction | 2024 |
| Romicon Limited | Construction | 2013 |
| Rooney Fine Foods Limited | Manufacturing | 2012 |
| Roulston Jardine Ltd | Professional & scientific | 2022 |
| S & S Construction (N.I.) Limited | Construction | 2008 |
| S B D Events Limited | Other services | 2002 |
| S D Haulage (2020) Ltd | Transport & logistics | 2020 |
| S J Walsh Medical Consulting Limited | Health & social care | 2017 |
| S Smyth Tiling Ltd | Construction | 2018 |
| Sanderson Equipment Ltd | Manufacturing | 2024 |
| Sara Mccracken Consulting Ltd | Professional & scientific | 2023 |
| Scmc Lifestyle Ltd | Wholesale & retail | 2017 |
| Scott Jess Builders Limited | Construction | 2018 |
| Shanmullagh Homes Ltd | Construction | 2020 |
| Sitec Developments Ltd | Manufacturing | 2021 |
| Small Batch Bistro Ltd | Hospitality | 2024 |
| Smao Developments Ltd | Real estate | 2026 |
| Smith Contracts (NI) Limited | Construction | 2014 |
| Smith Logistics Ltd | Transport & logistics | 2022 |
| Snob Distribution Limited | Wholesale & retail | 2009 |
| Softwashers NI Ltd | Administrative & support | 2022 |
| Soloyolo Ltd | Hospitality | 2022 |
| Somerville Building & Joinery Ltd | Construction | 2015 |
| Spice Fine Foods Limited | Wholesale & retail | 2021 |
| Spirit Rejuvenation Ltd | Health & social care | 2018 |
| Springwell House Limited | Financial services | 2025 |
| Sresco Ltd | Administrative & support | 2016 |
| Star Twines Limited | Extraterritorial | 1979 |
| Steadland (Holywood) Ltd | Real estate | 2017 |
| Steadland Construction Ltd | Construction | 2020 |
| Steadland Ltd | Real estate | 2011 |
| Steenson Contracts Ltd | Construction | 2026 |
| Steinway Holdings Limited | Financial services | 2018 |
| Steve ORR Limited | Financial services | 1977 |
| Steven Greer Plumbing & Heating Limited | Construction | 2013 |
| Stone Unlimited NI Ltd | Construction | 2012 |
| Strain Wind Services Ltd | Professional & scientific | 2023 |
| Struleview Homes Ltd | Construction | 2019 |
| Stuart Sloan Construction Ltd | Construction | 2023 |
| T.G Electrical Engineering Ltd | Construction | 2025 |
| Talent Engine Ltd | Professional & scientific | 2026 |
| Taste @ Market Square Ltd | Hospitality | 2019 |
| TDC Building & Joinery Ltd | Construction | 2026 |
| THE Apex Collective Ltd | Financial services | 2025 |
| THE Great Antiques Fair Ltd | Administrative & support | 2026 |
| THE Knowe Management Company Limited | Households | 2008 |
| THE Pepper Family Charitable Trust | Professional & scientific | 2007 |
| THE ÓR Standard Limited | Information & communication | 2026 |
| Thom Homes Ltd | Real estate | 2025 |
| Thompson Homes and Maintenance Ltd | Financial services | 2026 |
| Thompson Industrial Services Limited | Water & waste | 2010 |
| Thompson Leisure Limited | Wholesale & retail | 2011 |
| TM Collective Limited | Administrative & support | 2025 |
| Tommy Mcroberts Ltd | Agriculture & fishing | 2022 |
| Trauma Team NI Ltd | Health & social care | 2016 |
| Trinity MAR Thoma Church Belfast Ltd | Other services | 2026 |
| Trouver Consulting Ltd | Professional & scientific | 2022 |
| TS Plumbing & Heating Services (2026) Ltd | Construction | 2025 |
| Tsan Welcome Martins Ltd | Hospitality | 2023 |
| Tullymacarette Holdings Ltd | Financial services | 2022 |
| Tullyniskey Ltd | Transport & logistics | 2020 |
| Tummery Farms Ltd | Agriculture & fishing | 2021 |
| Tummery Homes Ltd | Real estate | 2023 |
| Two Acres Limited | Real estate | 2016 |
| Two Fifty Two Ltd | Financial services | 2016 |
| Tyler Graham Property Developments Ltd | Real estate | 2024 |
| Umac Solutions Limited | Information & communication | 2008 |
| Universal Pigeon Products Limited | Manufacturing | 2010 |
| Uprich Investments Ltd | Real estate | 2025 |
| UPU Industries Limited | Manufacturing | 1996 |
| Utopian Learning Ltd | Education | 2019 |
| Utopian Training Solutions Ltd | Education | 2018 |
| V. G. Cunningham Contracts Ltd | Construction | 2004 |
| Value Bedrooms Ltd | Wholesale & retail | 2022 |
| VIA Wings | Other services | 2016 |
| Volar-Ni Ltd | Information & communication | 2025 |
| W.S. Calvert Limited | Construction | 2005 |
| Watersedge Development Management Ltd | Real estate | 2015 |
| Waugh Farms Management Limited | Agriculture & fishing | 2011 |
| Weldon Properties Limited | Construction | 2000 |
| Westbourne Property Services Ltd | Professional & scientific | 2025 |
| Westbourne Residential Group Ltd | Real estate | 2025 |
| WFM Solutions Ltd | Manufacturing | 2022 |
| WG Mechanical Ltd | Manufacturing | 2021 |
| WGK Homes Limited | Construction | 2012 |
| Whitethorn Child and Educational Psychology Services Ltd | Education | 2020 |
| WHW Construction Ltd | Construction | 2021 |