| Trew Contracts Limited | Wholesale & retail | 2021 |
| Trewmount Limited | Professional & scientific | 2023 |
| Trident ERP Solutions Ltd | Information & communication | 2026 |
| Triple 8 Property Services Limited | Real estate | 2020 |
| Tromague Top Limited | Energy | 2023 |
| Trotter Contracts Limited | Agriculture & fishing | 2015 |
| Trotters Independent Salvage Limited | Wholesale & retail | 2023 |
| Truck & Trailer Works Limited | Manufacturing | 2016 |
| TSB & a Kerr Limited | Agriculture & fishing | 2010 |
| Tuff Tile Ltd | Wholesale & retail | 2020 |
| Tully Farms Limited | Agriculture & fishing | 2013 |
| Tully Hill Health Ltd | Health & social care | 2022 |
| Tullygally Open Space Management Company Ltd | Real estate | 2023 |
| Tullyglen Technology Limited | Information & communication | 2024 |
| Tullygoney Engineering & Fabrication Ltd | Manufacturing | 2013 |
| Tullyhogue Wind Limited | Real estate | 2020 |
| Tullylagan Vintage Owners Association Limited | Other services | 2003 |
| Tullyleek Precast Concrete Limited | Manufacturing | 2005 |
| Tullymore Limited | Manufacturing | 2010 |
| Tullymore Machinery Ltd | Wholesale & retail | 2018 |
| Tullynure Eggs Limited | Wholesale & retail | 2020 |
| Tullyroan Oval Limited | Arts & recreation | 2011 |
| Tullysaran Community Association | Arts & recreation | 2012 |
| Tumpher Investments | Professional & scientific | 2014 |
| Turn Hole Skand Limited | Real estate | 2023 |
| TUX & Tails Dungannon Limited | Wholesale & retail | 2016 |
| Twinie Oneill Ltd | Wholesale & retail | 2026 |
| Twist of the Wrist Limited | Education | 2024 |
| TWN Training Ltd | Health & social care | 2020 |
| Twosea Property Ltd | Real estate | 2020 |
| TY 2022 Limited | Wholesale & retail | 2022 |
| Tyrone Bricklayers Ltd | Construction | 2026 |
| Tyrone Electrical Ltd | Construction | 2020 |
| Tyrone Farmers Market Ltd | Manufacturing | 2004 |
| Tyrone Formwork Limited | Construction | 2014 |
| Tyrone GRP Ltd | Manufacturing | 2025 |
| Tyrone Guttering Services Limited | Construction | 1995 |
| Tyrone Linen Services Ltd | Administrative & support | 2020 |
| Tyrone Prefab Ltd | Construction | 2023 |
| Tyrone Printing Co., Limited | Manufacturing | 1917 |
| Tyrone Quality Picture Framing Limited | Wholesale & retail | 2005 |
| Tyrone Trad CIC | Arts & recreation | 2026 |
| Tyrone Trailers Ltd | Manufacturing | 2018 |
| Tyrone Transport Limited | Transport & logistics | 2018 |
| Tyrone Welfare Units Ltd | Manufacturing | 2020 |
| U Welcome Ltd | Hospitality | 2013 |
| UK Cars Direct (NI) Ltd | Wholesale & retail | 2021 |
| Ulster Farm By-Products Limited | Agriculture & fishing | 1993 |
| Ulster-Net (NI) Limited | Information & communication | 1997 |
| Ultrasound Imaging N.I. Ltd | Health & social care | 2025 |
| Undermoonhall Limited | Information & communication | 2024 |
| United Fashion International Ltd | Wholesale & retail | 1997 |
| Universal Process Engineering Limited | Construction | 2013 |
| University Street Lettings Limited | Real estate | 2017 |
| Unwins Seeds Limited | Professional & scientific | 2004 |
| UON Limited | Health & social care | 2023 |
| Uppercut Group Limited | Hospitality | 2020 |
| UR Data Limited | Information & communication | 2026 |
| Urban Pulse (Homes) Ltd | Construction | 2021 |
| US Snap MAC Limited | Wholesale & retail | 2014 |
| Utgard Ltd | Households | 2024 |
| Vantastic Conversions Ltd | Manufacturing | 2024 |
| Vasilev Engineering Ltd | Professional & scientific | 2011 |
| Vehicle Sourcing Services Ltd | Wholesale & retail | 2025 |
| Venture International Ltd | Professional & scientific | 2018 |
| Verisure Environmental NI Ltd | Water & waste | 2022 |
| Veronzer Ltd | Financial services | 2026 |
| Vertigo Indoors Limited | Arts & recreation | 2018 |
| Vertigo TQ Holdings Limited | Financial services | 2018 |
| VHL Construction Ltd | Construction | 2005 |
| VHL Developments Ltd | Construction | 2018 |
| VIA Creative Ltd | Wholesale & retail | 2026 |
| Vibe - Screed Ltd | Manufacturing | 2009 |
| Viberoptix Opco Ltd | Construction | 2020 |
| Victoria Lough Farm Ltd | Agriculture & fishing | 2017 |
| Video GUY (N.I.) Ltd | Information & communication | 2018 |
| Vilicus Limited | Real estate | 2024 |
| Villcrest Limited | Wholesale & retail | 2010 |
| Vilnius EFS Ltd | Wholesale & retail | 2011 |
| Vincent Holdings (N.I.) Limited | Financial services | 2023 |
| Visioncall Ireland Limited | Health & social care | 2011 |
| Vitaspark Limited | Real estate | 2014 |
| VM Bros Manufacturing Ltd | Professional & scientific | 2022 |
| W & a Property Developments Limited | Construction | 2005 |
| W Tools Direct Ltd | Wholesale & retail | 2025 |
| W&I Logistics Ltd | Transport & logistics | 2021 |
| Wallace and Company Ltd | Professional & scientific | 2010 |
| Walls Joinery Limited | Manufacturing | 2019 |
| Warmer Homes Limited | Construction | 2011 |
| Wavescreen Ltd | Manufacturing | 2022 |
| Wayfaring Limited | Arts & recreation | 2019 |
| Wayreco Lanz Ltd | Wholesale & retail | 2025 |
| WE ARE Ports Limited | Other services | 2017 |
| Wearepolitical Ltd | Other services | 2025 |
| Websiteni Ltd | Information & communication | 2007 |
| Weir & Daughters Property Holdings Ltd | Real estate | 2022 |
| Weir Bros Construction (NI) Limited | Construction | 2017 |
| Weir Refrigeration Services Ltd | Manufacturing | 2022 |
| Weldone Limited | Manufacturing | 2022 |
| West Division Developments Ltd | Construction | 2017 |