| Proform Golf Ltd | Arts & recreation | 2026 |
| Property Capital Consultants Ltd | Real estate | 2013 |
| Quigg Building & Surveying Ltd | Construction | 2019 |
| Quinn Cable Jointing Services Limited | Construction | 2024 |
| R Crawford Ltd | Wholesale & retail | 2018 |
| Ranaghan Care Ltd | Health & social care | 2023 |
| Rathcarn Plumbing & Heating Ltd | Construction | 2021 |
| Rathmore Consulting Limited | Information & communication | 2024 |
| RBD Software Solutions Limited | Information & communication | 2023 |
| Reach New Media Ltd | Information & communication | 2004 |
| Red Spruce Company Limited | Financial services | 2018 |
| Refresh Technology (N.I.) Limited | Other services | 2020 |
| Regans Bar Hall Street Limited | Hospitality | 2015 |
| Rewind Electrical Group Ltd. | Professional & scientific | 2017 |
| Rewind Electrical Services Ltd | Construction | 2017 |
| Riding for the Disabled Fort Centre Ltd | Arts & recreation | 2019 |
| RMC Contracts Ltd | Construction | 2024 |
| Rockmead Limited | Construction | 2020 |
| Rokit Contracts Ltd | Construction | 2022 |
| Roohan Hills Ltd | Financial services | 2023 |
| RT Boyd & Co Ltd | Construction | 2005 |
| RTD Contracts (N.I.) Limited | Construction | 2017 |
| Ryan Patrick Contracts Ltd | Manufacturing | 2026 |
| SAC & SON Limited | Construction | 2023 |
| SAC Plumbing & Heating Limited | Construction | 1996 |
| Saunders Consulting Ltd | Professional & scientific | 2024 |
| SBS Holdco Ltd | Financial services | 2019 |
| Scullion Construction Ltd | Construction | 2017 |
| Seamus Mcdonnell Towbar Sales Ltd | Wholesale & retail | 2024 |
| Select Aluminium Ltd | Wholesale & retail | 2025 |
| Select Automation Limited | Construction | 2024 |
| Senako Solutions Limited | Professional & scientific | 2024 |
| SFC Joinery Ltd | Construction | 2024 |
| SHB Timbers Limited | Construction | 2011 |
| Sheriff Technology Solutions Ltd | Manufacturing | 2019 |
| Signal Network and Wifi Solutions Ltd | Information & communication | 2023 |
| Silverhill Construction Limited | Construction | 2006 |
| Simple Group Holdings (N.I.) Limited | Professional & scientific | 2024 |
| SJ Boyd Ltd | Transport & logistics | 2016 |
| Sjmc Group Ltd | Construction | 2024 |
| SJS (NI) Ltd | Manufacturing | 2013 |
| SJS Hire Ltd | Administrative & support | 2023 |
| Slatabogie Energy Ltd | Extraterritorial | 2012 |
| Slatabogie Renewables Ltd | Energy | 2014 |
| SMA Utilities Limited | Construction | 2025 |
| Smyth Building & Joinery Contractors Ltd | Construction | 2018 |
| Solid Screeds NI Ltd | Construction | 2014 |
| Sonas Properties Ltd | Real estate | 2022 |
| South Bank Square Ltd | Construction | 2010 |
| South Derry Well Drilling Ltd | Construction | 2020 |
| Specialist Glass Limited | Manufacturing | 2016 |
| Specialist Group Holdings Limited | Financial services | 2020 |
| Specialist Installations Limited | Construction | 2017 |
| Specialist Joinery Overseas Limited | Manufacturing | 1994 |
| Sperrin Construction Services Ltd | Construction | 2024 |
| Sperrin Contracts Limited | Construction | 2014 |
| Sperrin Facades Ltd | Construction | 2018 |
| Sperrin Properties Limited | Construction | 2003 |
| Sperrin Skincare Ltd | Health & social care | 2019 |
| ST Patricks Renewable Energy Ltd | Energy | 2009 |
| ST. John's Bright Start | Education | 2016 |
| Strong ENG Ltd | Manufacturing | 2024 |
| T & T Electrical Services (NI) Ltd | Construction | 2010 |
| T Houston Electrical Ltd | Construction | 2014 |
| T M Waste Limited | Water & waste | 2009 |
| Teanga CIC | Information & communication | 2008 |
| Terjon Limited | Financial services | 2020 |
| THE Bar Health & Fitness Ltd | Arts & recreation | 2016 |
| THE Dairy VET Ltd | Professional & scientific | 2024 |
| THE Orangery @ Drenagh Ltd | Hospitality | 2023 |
| THE Sperrin Clinic Limited | Health & social care | 2011 |
| THE Ultimate Road Trip Resource Limited | Administrative & support | 2022 |
| THE Weatherbies Limited | Information & communication | 2009 |
| Therapy and Training Solutions Ltd | Health & social care | 2023 |
| Thornehill Kitchens Ltd | Manufacturing | 2020 |
| Tirgarve Holdings Ltd | Financial services | 2025 |
| Tirgarvil Groundtactics Ltd | Construction | 2026 |
| Tirhugh Construction Services Ltd | Construction | 2026 |
| Tirkane Hills Limited | Agriculture & fishing | 2017 |
| TMC Sales Ltd | Wholesale & retail | 2025 |
| Toolsaver Ireland Ltd | Wholesale & retail | 2026 |
| Total Ground Care (NI) Limited | Administrative & support | 2014 |
| Traw Property Ltd | Real estate | 2025 |
| Trendless Technologies Ltd | Information & communication | 2025 |
| Tullyheron Contracts Ltd | Construction | 2019 |
| Turas Solutions Ltd | Agriculture & fishing | 2021 |
| Turland Group Ltd | Construction | 2015 |
| Turner Contracts Ltd | Administrative & support | 2018 |
| Turner Electrical (NI) Ltd | Construction | 2007 |
| TY75287 Limited | Construction | 2022 |
| Valiant Products Limited | Wholesale & retail | 2024 |
| Van Factors Direct Limited | Wholesale & retail | 2024 |
| Victory Chimp Ltd. | Manufacturing | 2018 |
| Village Fryer Upperlands Ltd | Hospitality | 2026 |
| Vital Power Solutions Ltd | Professional & scientific | 2020 |
| Walsh Property Holdings (NI) Ltd | Real estate | 2022 |
| Wearparts (Ireland) Ltd | Wholesale & retail | 2024 |
| Wearparts (NI) Ltd | Wholesale & retail | 2024 |
| Whatsonni.Com Limited | Extraterritorial | 2010 |
| Whistle Bear Ltd | Hospitality | 2019 |