| Termon Finance Limited | Financial services | 2017 |
| Termon Holdings Ltd | Professional & scientific | 2012 |
| Termon Investments | Financial services | 2015 |
| Terra Consulting Ltd | Real estate | 2023 |
| Terra Renewable Solutions Ltd | Manufacturing | 2026 |
| Terramac Fabrication Ltd | Manufacturing | 2010 |
| Textile Enterprises Ltd | Manufacturing | 1995 |
| TFF Investments Ltd | Real estate | 2024 |
| TG Developers Ltd | Construction | 2014 |
| TGF Nutrition Ltd | Health & social care | 2018 |
| TGM Consulting Building Services Limited | Professional & scientific | 2006 |
| Thaddeus Acquisitions Limited | Real estate | 2020 |
| THE Auction Rooms MOY Ltd. | Manufacturing | 2004 |
| THE Beauty, Skin & Laser Lounge Ltd | Other services | 2024 |
| THE BLT Dungannon Ltd | Hospitality | 2023 |
| THE Bridge N.I Ltd | Arts & recreation | 2021 |
| THE Coaching Suite Ltd | Administrative & support | 2014 |
| THE Coffee Paddock Ltd | Hospitality | 2026 |
| THE Comfizone Group (HLD) Ltd | Financial services | 2020 |
| THE Compton Group (N.I.) Ltd | Real estate | 2021 |
| THE Containerco Ltd | Wholesale & retail | 2020 |
| THE Cottage Skin Clinic Ltd | Other services | 2023 |
| THE Diamond Chinese Ltd | Hospitality | 2019 |
| THE Good SOS Company Ltd | Manufacturing | 2020 |
| THE Heather Edge Community Interest Company | Professional & scientific | 2015 |
| THE Ironing Room (NI) Limited | Other services | 2022 |
| THE Jardine Foundation | Arts & recreation | 2024 |
| THE Loft Coffee Bar Ltd | Hospitality | 2011 |
| THE Millcourt Bar & Restaurant Ltd | Hospitality | 2019 |
| THE Miners Coalisland Ltd | Hospitality | 2025 |
| THE MOY Fayre Ltd | Hospitality | 2022 |
| THE MOY Group Ltd | Financial services | 2026 |
| THE Natural Healing Hub Ltd | Health & social care | 2023 |
| THE NI Body Stop Limited | Wholesale & retail | 2021 |
| THE NUT Butter Company Limited | Manufacturing | 2022 |
| THE Old Colliery Ltd | Construction | 2026 |
| THE Old Rectory Poultry Farm Ltd | Agriculture & fishing | 2015 |
| THE Physio Studio Limited | Health & social care | 2020 |
| THE Ramp Company Ltd. | Wholesale & retail | 2011 |
| THE Retreat @ Greystone Ltd | Other services | 2016 |
| THE Royal Oak Ltd | Hospitality | 2026 |
| THE Speedwell Trust Limited | Education | 2021 |
| THE Spires Bush Road MGT Company Ltd | Real estate | 2025 |
| THE Sports Recovery Centre Limited | Arts & recreation | 2018 |
| THE Stables MOY Ltd | Hospitality | 2026 |
| THE Tech Guys Ltd | Construction | 2018 |
| THE VOW Bridal Studio Ltd | Wholesale & retail | 2022 |
| Thinksmart Financial Solutions Ltd | Financial services | 2017 |
| Thinksync Solutions Ltd | Professional & scientific | 2024 |
| Thomas Doran Parkanaur Trust | Education | 1969 |
| Thomas Street Leisure Ltd | Arts & recreation | 2020 |
| Three Sixty Advisory Ltd | Professional & scientific | 2024 |
| Thyme and Time Catering Limited | Hospitality | 2025 |
| Timersion Ltd | Manufacturing | 2024 |
| Tiny Roots Ltd | Manufacturing | 2025 |
| TIR Environmental Services Ltd | Manufacturing | 2026 |
| TJ Salmon Ltd | Hospitality | 2023 |
| TLI Utility Services NI Limited | Manufacturing | 2018 |
| TMC Health and Fitness Limited | Arts & recreation | 2017 |
| TMC Property Investment Ltd | Real estate | 2023 |
| Tobermason Farm Ltd | Agriculture & fishing | 2015 |
| Tobermore Farms Ltd | Agriculture & fishing | 2015 |
| Todds Leap Limited | Other services | 2010 |
| Tojur Civils Ltd | Real estate | 2022 |
| TOM Henry & Co Limited | Real estate | 2003 |
| TOM Herron Experience Ltd | Health & social care | 2020 |
| Tomax Lifting Solutions Ltd | Professional & scientific | 2023 |
| TON Groundworks Limited | Construction | 2024 |
| Toncc Limited | Manufacturing | 2003 |
| Toner Electrical Ltd | Construction | 2017 |
| Tonnc Limited | Manufacturing | 2003 |
| Tontcon Limited | Information & communication | 1904 |
| Tontine Rooms Holding Company Limited - the | Information & communication | 1977 |
| Tontyc Limited | Information & communication | 1988 |
| Tonuga Limited | Information & communication | 1945 |
| Top Gear Autos N.I. Ltd | Arts & recreation | 2020 |
| Top Landscapes & Gardening Limited | Administrative & support | 2026 |
| Top Tier Resourcing Ltd | Administrative & support | 2023 |
| Torrent Mill Property Limited | Extraterritorial | 2024 |
| Torrent Pharma Ltd | Wholesale & retail | 2010 |
| Torrent Property Ltd | Real estate | 2022 |
| Torrent Valley Initiative Company Limited | Administrative & support | 1997 |
| Torrent View Management Limited | Households | 2018 |
| Totally Appenin Ltd | Information & communication | 2015 |
| Toubkal Limited | Financial services | 2011 |
| Toyota Parts NI Ltd | Wholesale & retail | 2023 |
| Tpod Properties Limited | Real estate | 2024 |
| TQ Comms Ltd | Construction | 2022 |
| TQ Park Limited | Arts & recreation | 2017 |
| Trade Cars MOY Ltd | Wholesale & retail | 2017 |
| Trade Robes Limited | Manufacturing | 2003 |
| Traynors Holdings Ltd | Financial services | 2020 |
| Trce Property Limited | Real estate | 2018 |
| Treasure Touring Ltd | Construction | 2016 |
| Treeview Contracts Ltd | Construction | 2015 |
| Tremoge Farm Ltd | Agriculture & fishing | 2018 |
| Tremogue Properties Limited | Professional & scientific | 2007 |
| Trendsntrims Ltd | Wholesale & retail | 2025 |
| Trevor Law Ltd | Real estate | 2014 |
| Trew Beauty Limited | Wholesale & retail | 2024 |