| Trafficwise Limited | Extraterritorial | 2008 |
| Trailertek (NI) Ltd | Wholesale & retail | 2014 |
| Train 2B Smart Ltd | Education | 2019 |
| Transform E-Commerce Ltd | Wholesale & retail | 2024 |
| Translation Hub Ltd | Professional & scientific | 2025 |
| Treadsafe Mats & Matting Ltd | Construction | 2008 |
| Treehouse Softplay Centre Ltd | Hospitality | 2023 |
| Treetops Holding Company | Administrative & support | 1983 |
| Trevor Ardis Transport Ltd | Transport & logistics | 2019 |
| Tribe Crossfit Moira Ltd | Arts & recreation | 2021 |
| Trinity Park Nursery Ltd | Health & social care | 2014 |
| Triple S Security Ltd | Administrative & support | 2023 |
| Tritos Medical Ltd | Information & communication | 2022 |
| Trolley Dollies Travels Ltd | Administrative & support | 2024 |
| Tropicroot Hydroponics Ltd | Agriculture & fishing | 2026 |
| Truck Sales (NI) Ltd | Wholesale & retail | 2013 |
| Trucorp Limited | Manufacturing | 2002 |
| True Electric Ltd | Wholesale & retail | 2023 |
| True Spend Ltd | Information & communication | 2025 |
| Trueline Steel Ltd | Construction | 2025 |
| Trummery Ltd | Other services | 2012 |
| TSC Logistics Ltd | Transport & logistics | 2021 |
| TSC Storage & Distribution Ltd | Transport & logistics | 2021 |
| Tully Properties Limited | Extraterritorial | 2023 |
| Tullygally Inns Limited | Hospitality | 2003 |
| Tullygally Stores Limited | Wholesale & retail | 2012 |
| Tullyherron Developments Ltd | Construction | 1998 |
| Tullyloob Equine Limited | Arts & recreation | 2016 |
| Tullyloob Holdings Limited | Agriculture & fishing | 2015 |
| Tullynagarn Management Company Limited | Households | 2006 |
| Tunnel Bar Limited-The | Hospitality | 2002 |
| Turkington Holdco (NI) Limited | Real estate | 2014 |
| Turkish Kebab & Pizza House (Portadown) Ltd | Hospitality | 2022 |
| Turkish Kebab & Pizza House Moira Ltd | Hospitality | 2025 |
| Turmore Properties Limited | Construction | 2007 |
| Twenty Acres Trading Limited | Financial services | 2020 |
| Twiin Digital Ltd | Administrative & support | 2020 |
| Tyrehunters.Com Ltd | Wholesale & retail | 2022 |
| U.M.E (NI) Ltd | Agriculture & fishing | 2003 |
| UBC Logistics UK Limited | Wholesale & retail | 2023 |
| Uccss Ltd | Wholesale & retail | 2025 |
| Ugomunachi Ltd | Public administration | 2025 |
| UK Bite Limited | Hospitality | 2020 |
| Ukrainians in NI Ltd | Education | 2022 |
| Ulidia Investments Ltd | Information & communication | 2008 |
| Ulster Carpet Mills Limited | Extraterritorial | 1989 |
| Ulster Carpet Mills Merged Pension Plan Trustee Limited | Financial services | 2015 |
| Ulster Carpets Holdings Limited | Manufacturing | 2025 |
| Ulster Carpets Midco Limited | Manufacturing | 2025 |
| Ulster Human Rights Watch | Professional & scientific | 2002 |
| Ultamotive Ltd | Manufacturing | 2023 |
| UME 24 Ltd | Agriculture & fishing | 2024 |
| Unhinged Solutions Ltd | Information & communication | 2025 |
| Union Builders Ltd | Construction | 2012 |
| Union Masonic Lodge 105 Tandragee Limited | Other services | 2016 |
| United Quad Racing Ireland Limited | Arts & recreation | 2015 |
| United Wine Merchants Limited | Wholesale & retail | 1985 |
| Universe Hype Ltd | Wholesale & retail | 2025 |
| Unix Investment Company Limited | Financial services | 2022 |
| UP & Down Scaffolding Limited | Construction | 2025 |
| Urban Prints & Embroidery Ltd | Manufacturing | 2025 |
| UTD FC Limited | Arts & recreation | 2017 |
| V & C Limited | Hospitality | 2015 |
| Valerka Transport Ltd | Transport & logistics | 2025 |
| Valk Welding Ireland Limited | Administrative & support | 2022 |
| Valley Lane Consultancy Limited | Real estate | 2017 |
| Vanbuilt Ltd | Wholesale & retail | 2018 |
| Vanilla Beauty (Belfast) Ltd | Other services | 2020 |
| Vanspares Ltd | Wholesale & retail | 2010 |
| Vantage Insight Ltd | Information & communication | 2008 |
| Vapingni Ltd | Wholesale & retail | 2024 |
| Vasectomyni Limited | Health & social care | 2023 |
| Vault Entertainment Ltd | Information & communication | 2023 |
| VCS Investments Ltd | Real estate | 2024 |
| Vdenss Shops NI Limited | Wholesale & retail | 2024 |
| Vector Consumer Europe Limited | Wholesale & retail | 2021 |
| Vectus Systems Limited | Wholesale & retail | 2019 |
| Vendnation IRL Ltd | Other services | 2019 |
| Veritas Wealth Management Ltd | Professional & scientific | 2015 |
| Vfecto Ltd | Professional & scientific | 2007 |
| Vglds Limited | Information & communication | 2026 |
| Vibrant Talent Development Limited | Professional & scientific | 2015 |
| Victoria Mini Market Limited | Wholesale & retail | 2018 |
| Victoria's Health and Beauty Ltd | Other services | 2022 |
| Viet by VEE Limited | Hospitality | 2022 |
| Village Green Management Limited | Households | 1997 |
| Village Logistics Ltd | Transport & logistics | 2021 |
| Village Taxis Ltd. | Transport & logistics | 2019 |
| Vision in Property Ltd | Real estate | 2019 |
| Vision Killyman Ltd | Hospitality | 2023 |
| Visual Antics Apparel Limited | Wholesale & retail | 2023 |
| Vitmal Ltd | Real estate | 2024 |
| Viva Car Sales Ltd | Wholesale & retail | 2025 |
| VJ Logisctic Limited | Transport & logistics | 2020 |
| Vmpt Ltd | Arts & recreation | 2025 |
| Vogue Surrounds Limited | Manufacturing | 2000 |
| Vortexi (UK) Ltd | Manufacturing | 2019 |
| Voxport AI Limited | Information & communication | 2023 |
| W.A.H Foods Ltd | Hospitality | 2022 |
| W.D. Irwin & Sons Limited | Manufacturing | 2006 |