| Smfc Holdings Ltd | Financial services | 2023 |
| Smfc Properties Ltd | Real estate | 2024 |
| Smile Equestrian Riding School Limited | Other services | 2025 |
| Smiles and Aesthetics Ltd | Health & social care | 2024 |
| Smith Vehicle Solutions Ltd | Administrative & support | 2017 |
| SMN Contracts Ltd | Construction | 2013 |
| SMS Plumbing & Heating (N.I.) Limited | Construction | 2018 |
| Smyth Farming Ltd | Agriculture & fishing | 2015 |
| SN Builders Ireland Ltd | Construction | 2026 |
| Snoring Solutions Ltd | Health & social care | 2017 |
| Snowdrops Day Nursery & OUT of School Club Ltd | Health & social care | 2019 |
| Social Vape Ltd | Wholesale & retail | 2022 |
| Solar UP Limited | Construction | 2024 |
| Sona-Gym Limited | Other services | 2023 |
| Soultana Limited | Professional & scientific | 2024 |
| Sparta Developments Ltd | Professional & scientific | 2025 |
| Sparta Management Ltd | Professional & scientific | 2020 |
| Specialist Safety Consultants Ltd | Professional & scientific | 2020 |
| Specialistexcavationsni Ltd | Agriculture & fishing | 2025 |
| Sperrinview Property Ltd | Real estate | 2022 |
| SPH2O Ltd | Professional & scientific | 2011 |
| Sphere Accounting Limited | Professional & scientific | 2017 |
| Spinners Cost Consultancy Ltd | Professional & scientific | 2025 |
| Spjw Holdings Ltd | Professional & scientific | 2016 |
| SPM Heavy Mechanical Limited | Manufacturing | 2016 |
| Springhill Transport Ltd | Transport & logistics | 2019 |
| Springisland Investments Limited | Administrative & support | 2008 |
| SPS Logistics Limited | Transport & logistics | 2021 |
| Sq-Qs Ltd | Professional & scientific | 2016 |
| SRB Care Ltd | Health & social care | 2005 |
| SRS Mobile Ltd | Manufacturing | 2016 |
| Sstk Foods Ltd | Hospitality | 2022 |
| ST Patrick's Community Resource Centre Limited | Other services | 2018 |
| Stanley Livingstone Limited | Agriculture & fishing | 2013 |
| Starview Enterprises NI Limited | Wholesale & retail | 2023 |
| Steer Training Academy Ltd | Health & social care | 2017 |
| Step and Stair Limited | Real estate | 2022 |
| Stephen Brown Electrical Ltd | Construction | 2025 |
| Steven Druse Surveying Ltd | Professional & scientific | 2017 |
| Stone Lough Ltd | Professional & scientific | 2026 |
| Stonerock Sales Ltd | Wholesale & retail | 2012 |
| Stormproof: Roofing & Coating Contracts Ltd | Construction | 2025 |
| Strand Corner Trading Ltd | Construction | 2021 |
| Stratify Solutions Ltd | Financial services | 2023 |
| Strength & Tone Dynamic Reformers Ltd | Arts & recreation | 2024 |
| Stringers Mill Events Company Ltd | Hospitality | 2023 |
| Structured Training Club Limited | Health & social care | 2026 |
| Struxxur Ltd | Construction | 2022 |
| STS Consultancy and Training Ltd | Professional & scientific | 2021 |
| Success Wealth Management Limited | Professional & scientific | 2024 |
| Summit Construction Management Services Limited | Administrative & support | 2024 |
| Sunpower Electrical Ltd | Construction | 2024 |
| Superrugstore Limited | Wholesale & retail | 2014 |
| Superstitch Limited | Manufacturing | 2016 |
| Sweet Briar Farms Ltd | Agriculture & fishing | 2022 |
| S’More’A’Licious Ltd | Manufacturing | 2021 |
| T & J Contracts Ltd | Construction | 2024 |
| T.G. Hawthorne Holdings | Extraterritorial | 2022 |
| T.G. Hawthorne Ltd | Wholesale & retail | 2021 |
| T.G. Hawthorne Property Ltd | Professional & scientific | 2022 |
| Taby Limited | Wholesale & retail | 2026 |
| Tactical Consultancy Limited | Professional & scientific | 2021 |
| Take Global Ltd | Wholesale & retail | 2026 |
| Tank Testing Services (IRL) Limited | Professional & scientific | 2014 |
| Tarasis Enterprises Limited | Professional & scientific | 2011 |
| Tarasis Investments Limited | Real estate | 2025 |
| Tarasis Limited | Professional & scientific | 2008 |
| Tarasis Renewables Ltd | Energy | 2016 |
| Tass Farms Ltd | Agriculture & fishing | 2022 |
| Tasty Bites Takeaway Ltd | Hospitality | 2024 |
| Taxi Network Ltd | Transport & logistics | 2024 |
| Tcni Solutions Ltd | Financial services | 2024 |
| TDK PIG Farm Ltd | Agriculture & fishing | 2018 |
| Tegal Contracts Ltd | Construction | 2024 |
| TEK-2 Engineering Ltd | Manufacturing | 2005 |
| Tenant Find App Ltd | Information & communication | 2021 |
| Testa Electrical Ltd | Construction | 2021 |
| THE Armagh Rhymers Educational & Cultural Organisation | Arts & recreation | 1988 |
| THE Baby Boutique & Co (NI) Limited | Wholesale & retail | 2018 |
| THE Bloom Hill Property Co. Ltd | Real estate | 2025 |
| THE Car Nerd Limited | Wholesale & retail | 2023 |
| THE CBD & Hemp Store Ltd | Wholesale & retail | 2017 |
| THE Commerical Ltd | Hospitality | 2018 |
| THE Compound Gym Armagh Ltd | Arts & recreation | 2026 |
| THE Craic'D POT Coffee House Ltd | Hospitality | 2023 |
| THE Dolphin Takeaway (Markethill) Limited | Hospitality | 2021 |
| THE Flavoursmyth Ltd | Hospitality | 2022 |
| THE Football and Tennis Academy Limited | Real estate | 2011 |
| THE Iberian Wolf Experience Ltd | Wholesale & retail | 2024 |
| THE Irish Joinery Company Ltd | Construction | 2016 |
| THE Killuney Office Limited | Professional & scientific | 2025 |
| THE Lifting Room Ltd | Arts & recreation | 2018 |
| THE Little Orchard Nursery Ltd | Health & social care | 2021 |
| THE Malawi Projects Ltd | Other services | 2018 |
| THE Manderley Group Ltd | Construction | 2023 |
| THE MSA Partnership Ireland Limited | Education | 2024 |
| THE RUG House Ltd | Transport & logistics | 2011 |
| THE Sensory Xperience Ltd | Education | 2023 |
| THE Skin Boutique by Emma Ltd | Other services | 2026 |
| THE Sweet Guys(Ni) Ltd | Wholesale & retail | 2024 |