| THE Toby JUG Ltd | Hospitality | 2024 |
| THE Twisted FOX Ltd | Hospitality | 2020 |
| THE Village Armagh Ltd | Other services | 2022 |
| THE Village Bakery Markethill Ltd | Wholesale & retail | 2015 |
| THE Wahey Company Ltd | Administrative & support | 2025 |
| Thermal Building Structures Ltd | Manufacturing | 2015 |
| Thomas Dougan Consultancy Ltd | Professional & scientific | 2026 |
| Thomas LEE and Associates Limited | Extraterritorial | 2010 |
| Thomas Street Retail Limited | Wholesale & retail | 2020 |
| Thomastown Trucks (NI) Ltd | Wholesale & retail | 2023 |
| Tile Studio Ltd | Construction | 2025 |
| Timber Material Supplies Ltd | Wholesale & retail | 2024 |
| Tiny Village Ltd | Arts & recreation | 2023 |
| Tirnatec Limited | Information & communication | 2013 |
| Tirnatec Property Holdings Limited | Real estate | 2019 |
| Titan Trade Group Ltd | Wholesale & retail | 2025 |
| TK Machine Services Ltd | Manufacturing | 2023 |
| TLE Electrical Services Ltd | Construction | 2025 |
| TMC Contracts Limited | Administrative & support | 2016 |
| Toads Luck Ltd | Other services | 2018 |
| Toal Civil Contracts Ltd | Construction | 2019 |
| Toal Civil Plant Hire Ltd | Administrative & support | 2025 |
| Toal Investments Ltd | Real estate | 2024 |
| Toaltrucksales Ltd | Wholesale & retail | 2024 |
| Tomiboard Ltd | Manufacturing | 2026 |
| Toner Property Services Ltd | Households | 2022 |
| Top Target Trading Ltd | Wholesale & retail | 2013 |
| Topgun Property Group Ltd | Real estate | 2020 |
| Total Batching Solutions Rentals Limited | Administrative & support | 2021 |
| Town Cabs Markethill Ltd | Transport & logistics | 2019 |
| Trackable Art Ltd | Information & communication | 2014 |
| Tradala Limited | Wholesale & retail | 2019 |
| Trade and Export Limited | Wholesale & retail | 2020 |
| Tradewear Ltd | Wholesale & retail | 2019 |
| Trailer Diagnostic Services Ltd | Manufacturing | 2013 |
| Trampolines Ireland Limited | Wholesale & retail | 2025 |
| Tranzexpress Limited | Transport & logistics | 2026 |
| Traynor Furnishings Ltd | Wholesale & retail | 2016 |
| Treanor Contract Furniture Limited | Manufacturing | 2019 |
| Tregaron Properties Ltd | Construction | 2018 |
| Triggertraders Ltd | Professional & scientific | 2021 |
| Trimprint Limited | Manufacturing | 1973 |
| Trinity Support & Care Services Limited | Public administration | 2022 |
| Trio Construction Plant & Machinery Ltd | Construction | 2018 |
| Truck Parts N I Ltd | Wholesale & retail | 2017 |
| TS Utilities Ltd | Construction | 2016 |
| Tsudan International Enterprises Ltd | Professional & scientific | 2018 |
| Tuan Nails Ltd | Other services | 2025 |
| Tullydoo Services Ltd | Professional & scientific | 2022 |
| Tullyelmer Ltd | Manufacturing | 2025 |
| Tullygarden Ltd | Real estate | 2022 |
| Tullysaran Farms Limited | Agriculture & fishing | 2013 |
| Tunr Ltd | Professional & scientific | 2025 |
| Turas Pantry Limited | Manufacturing | 2025 |
| Turn Distribution Limited | Wholesale & retail | 2019 |
| Twilight Technologies Ltd | Information & communication | 2025 |
| Twin Secret Ltd | Wholesale & retail | 2024 |
| Twozeven Ltd | Construction | 2018 |
| Tyra Properties Ltd | Real estate | 2016 |
| Tyrone International Limited | Manufacturing | 2019 |
| Tyross Transport Ltd | Transport & logistics | 2011 |
| U.M.I Foods Ltd | Wholesale & retail | 2017 |
| UK Master Cleaning Ltd | Administrative & support | 2025 |
| Ulco Holdings Ltd | Financial services | 2017 |
| Ulster Builders Providers Limited | Wholesale & retail | 1976 |
| Umgola Park Limited | Construction | 2019 |
| Unibot Automation Ltd | Manufacturing | 2025 |
| Unicode Limited | Manufacturing | 2021 |
| Unimush Ireland Holdings Ltd | Administrative & support | 2018 |
| Unimush Ireland Ltd | Manufacturing | 2006 |
| Unique Design Specialists Ltd | Construction | 2025 |
| Unique Kitchen Design (Armagh) Ltd | Construction | 2016 |
| Unity Business Group Ltd | Financial services | 2025 |
| Unity Business Support Ltd | Administrative & support | 2025 |
| Unity Digital & AI Solutions Ltd | Information & communication | 2025 |
| Unity Influence Academy Ltd | Education | 2025 |
| Unity Sales Outsourcing Ltd | Professional & scientific | 2025 |
| Unity Sales Talent Ltd | Administrative & support | 2025 |
| Unity Sales Training Ltd | Education | 2025 |
| Vallely Ltd | Real estate | 2026 |
| Valley View Farm (N.I) Ltd | Agriculture & fishing | 2025 |
| Value Stores (NI) Ltd | Wholesale & retail | 2011 |
| Vape Escape Ltd | Wholesale & retail | 2021 |
| Vaping Empire NI Limited | Wholesale & retail | 2024 |
| Vault Storage Solutions Limited | Transport & logistics | 2025 |
| Veiirs Limited | Information & communication | 2025 |
| Versavile Ltd | Wholesale & retail | 2026 |
| Very Vintage Ltd | Wholesale & retail | 2022 |
| Vetortho Referrals Limited | Professional & scientific | 2016 |
| Vibe Go Ltd | Health & social care | 2024 |
| Victor Foster Poultry Services Limited | Agriculture & fishing | 2003 |
| VIP Accountants Ltd | Professional & scientific | 2025 |
| Vista Design Services Ltd | Professional & scientific | 2026 |
| Viva Bar & Venue Ltd | Hospitality | 2017 |
| VS Civil Contracts Ltd | Construction | 2024 |
| W Reynolds Contracts Ltd | Construction | 2026 |
| W S Wilson Contracts Ltd | Construction | 2023 |
| W.V.Hogg Ltd | Professional & scientific | 2017 |
| Wallace & Sons Limited | Administrative & support | 2016 |
| Walltech Eco Clean Ltd | Administrative & support | 2020 |