| Trainor Haulage Limited | Transport & logistics | 2014 |
| Trainor Holdings Ltd | Financial services | 2026 |
| Trannish Ltd. | Real estate | 2018 |
| Transport & Logistic Services Ltd | Transport & logistics | 2020 |
| Trasna Brands Ltd | Wholesale & retail | 2019 |
| Trasna Limited | Financial services | 2021 |
| Travers Transport Limited | Transport & logistics | 2022 |
| Treegrove Properties Limited | Real estate | 2000 |
| Trevor's Courier Services Ltd | Transport & logistics | 2018 |
| Triskele Construction Ltd | Construction | 2019 |
| Tritan Machinery Ltd | Manufacturing | 2025 |
| Trunk Bespoke Doors Limited | Manufacturing | 2009 |
| Trunk Flooring Limited | Manufacturing | 2004 |
| Trunk Property Limited | Real estate | 2021 |
| Tssafety Limited | Public administration | 2025 |
| Tullycreevy Eggs Ltd | Agriculture & fishing | 2019 |
| Tullycross Livestock Ltd | Agriculture & fishing | 2020 |
| Tullydevenish Limited | Agriculture & fishing | 2025 |
| Tullymeadows Farm Ltd | Agriculture & fishing | 2021 |
| Tullymore Automation Limited | Professional & scientific | 2024 |
| Tullyneil Ltd | Financial services | 2021 |
| Tullywooley Properties Limited | Real estate | 2005 |
| Turbine Safety Tools Limited | Manufacturing | 2017 |
| TUS UR Ltd | Mining & quarrying | 2026 |
| Twig & Tumble Ltd | Hospitality | 2025 |
| Tyfer Networks Limited | Construction | 2016 |
| TYR3D (NI) Ltd | Manufacturing | 2023 |
| Tyre Centre Group Ltd | Wholesale & retail | 2019 |
| Tyrone Music Ltd | Arts & recreation | 2022 |
| U.R.Stunning Limited | Wholesale & retail | 2020 |
| Uburns Limited | Real estate | 2023 |
| Uisce | Education | 2020 |
| Uisce Resources | Education | 2025 |
| UK Investment Properties Limited | Real estate | 2018 |
| Ulster Dog Breeding Academy Ltd | Agriculture & fishing | 2015 |
| Universal Footwear Ltd | Wholesale & retail | 2025 |
| Universal Health Products Ltd | Manufacturing | 2025 |
| Upper Lough Erne COT Group Ltd | Transport & logistics | 1995 |
| Upstairs Downstairs Furniture Limited | Other services | 2015 |
| Valeries Enterprises Limited | Real estate | 2013 |
| Valley Commercials Limited | Wholesale & retail | 2012 |
| Vans Ireland Fleet Rental Limited | Wholesale & retail | 2000 |
| Varry Properties Limited | Real estate | 2015 |
| Venture Retail Limited | Wholesale & retail | 2015 |
| VGM Consulting Ltd | Information & communication | 2023 |
| VGN Limited | Hospitality | 2026 |
| Vincent Donegan & Company Ltd | Financial services | 2013 |
| VP Loughshore Limited | Real estate | 2018 |
| Vrai Limited | Professional & scientific | 2013 |
| W G Motors Limited | Wholesale & retail | 2002 |
| W.T. Morrison Holdings Limited | Real estate | 2022 |
| W.T. Morrison Limited | Other services | 2022 |
| W.T. Morrison Properties Limited | Real estate | 2022 |
| Wact Investments Ltd | Real estate | 2026 |
| Walmsley Tractors Ltd | Wholesale & retail | 2004 |
| Waltree Land Ltd | Agriculture & fishing | 2021 |
| Wardrobe Solutions Ltd | Wholesale & retail | 2021 |
| Washme Enniskillen Limited | Other services | 2024 |
| Water's Edge Management Company Ltd | Administrative & support | 2007 |
| WBG Properties Ltd | Real estate | 2022 |
| WD Car Recovery and Haulage Limited | Transport & logistics | 2026 |
| WE FIX Potholes Limited | Extraterritorial | 2020 |
| WE Vape Shop Ltd | Wholesale & retail | 2023 |
| WED Alsamad Limited | Health & social care | 2026 |
| Weir & BRO. Electrical Ltd | Construction | 2023 |
| Wellfield Projects Limited | Construction | 2018 |
| Wellworth Properties Limited | Real estate | 1986 |
| West Fermanagh Farmers Cluster Ltd | Other services | 2024 |
| Westandswiftelectrical Ltd | Construction | 2026 |
| Western Area Charitable Trust for Integrated Education | Education | 1989 |
| Western Brand Poultry Products (NI) Ltd | Manufacturing | 2006 |
| Westminster Court (Ballinamallard) Management Ltd | Households | 2019 |
| Weststar Property Developments Ltd | Real estate | 2006 |
| Westville Hospitality Ltd | Hospitality | 2014 |
| Westville Properties Limited | Real estate | 2022 |
| Westwood Marine Leisure Limited | Manufacturing | 2013 |
| Wheathill Holding Limited | Real estate | 2020 |
| Whisk and Copper Ltd | Hospitality | 2026 |
| Whitehouse Developments Limited | Real estate | 2006 |
| Whitepark Farms Limited | Agriculture & fishing | 2007 |
| Wholefroot Limited | Hospitality | 2016 |
| WI Properties Limited | Real estate | 2004 |
| Wilde Dining Events Ltd | Hospitality | 2025 |
| Wilkin Enterprises Ltd | Wholesale & retail | 2024 |
| Willis Fuels Ltd | Wholesale & retail | 2022 |
| Willow & BUD Limited | Information & communication | 2025 |
| Willowtree Enterprises Ltd | Wholesale & retail | 2018 |
| Wilson Lendrum & Weir Holding Limited | Financial services | 2019 |
| Wilson Poultry Limited | Agriculture & fishing | 2011 |
| Wishcare Properties Limited | Real estate | 1993 |
| Woodburn Farm Ltd | Wholesale & retail | 2024 |
| Woods Motor Repair Ltd | Manufacturing | 2020 |
| Woods Quality Homes Limited | Real estate | 2008 |
| Woody's Retail Ltd | Wholesale & retail | 2025 |
| Work Appearance NI Limited | Wholesale & retail | 2023 |
| Workspace Wellbeing Ltd | Wholesale & retail | 2024 |
| WWW. Carzone NI. Co.Uk Limited | Wholesale & retail | 2011 |
| Wylie Plant & Civils Ltd | Construction | 2025 |
| Wynne Coaches Limited | Transport & logistics | 2019 |
| X-Cel Fitness Ltd | Manufacturing | 2020 |