| TR Aerosytems Ltd | Manufacturing | 2022 |
| Trail House Limited | Real estate | 2026 |
| Tranquil Tides Ltd | Real estate | 2025 |
| Transfer Test Limited | Education | 2022 |
| Transform Your Health Network Ltd | Education | 2016 |
| Trine Studios Limited | Information & communication | 2024 |
| TRIPLE4 Agencies Limited | Wholesale & retail | 2019 |
| Trojan Horse Sales Consultancy Ltd | Information & communication | 2020 |
| Troopers Lane Management Company Limited | Households | 2005 |
| Trove and Haven Ltd | Wholesale & retail | 2026 |
| Trumo Technology Limited | Information & communication | 2020 |
| Tsds Belfast Ltd | Other services | 2024 |
| TTE Global Limited | Wholesale & retail | 2012 |
| Ttep Kilroot Energy Park Ltd | Energy | 2023 |
| Ttep Kilroot Flex Power Ltd | Energy | 2020 |
| Ttep Kilroot Power Ltd | Energy | 1991 |
| Tttkmataz Limited | Health & social care | 2022 |
| Tudor Oaks Management Company Ltd | Households | 2008 |
| Tuition Time by Debbie Goss Ltd | Education | 2025 |
| Tulip Corps Ltd | Information & communication | 2026 |
| Tullygreen (NI) Ltd | Wholesale & retail | 2016 |
| Tumaini Wellness and Hope CIC | Education | 2026 |
| Turning Point Technique Ltd | Professional & scientific | 2018 |
| Tweed Global Logistics Ltd | Wholesale & retail | 2023 |
| Twin Computer Personnel Limited | Administrative & support | 2012 |
| Two Five Two Management Company (NO.1) Limited | Households | 2010 |
| Two Five Two Management Company (NO.2) Limited | Households | 2010 |
| Tyler Group Ltd | | 1936 |
| Ulster Centre Sports Promotions Limited | Arts & recreation | 1995 |
| Ulster Itil Solutions Limited | Information & communication | 2013 |
| United BUS Company Limited | Transport & logistics | 2017 |
| V4BROTHERS Limited | Hospitality | 2023 |
| Valedictus Group Limited | Extraterritorial | 1973 |
| Valedictus Holdings Limited | Extraterritorial | 1952 |
| Valedictus Limited | Extraterritorial | 1938 |
| Valley Finance Global Limited | Financial services | 2022 |
| Valsam Ltd | Hospitality | 2012 |
| Vannin Enterprises (UK) Ltd | Manufacturing | 2025 |
| VD4S Limited | Hospitality | 2025 |
| Veecom Ltd | Manufacturing | 2024 |
| Vend NI Sales & Servicing Ltd | Manufacturing | 2012 |
| Verio Media Limited | Professional & scientific | 2026 |
| Victoria Bridge Management Company Ltd | Households | 2011 |
| Victoria Bridge Management Company NO. 2 Limited | Households | 2019 |
| Victoria Court (Carrickfergus) Ltd | Households | 2006 |
| Victoria Dental Care Ltd | Health & social care | 2024 |
| Victoria Eco DRY Cleaners Limited | Administrative & support | 2023 |
| Victoria Lane Management Company Ltd | Households | 2008 |
| Victoria Pet Shop Ltd | Wholesale & retail | 2022 |
| Victories Repeated Daily Ltd | Information & communication | 2025 |
| Vision Beauty Group Ltd | Wholesale & retail | 2020 |
| Vista Blinds Ltd | Manufacturing | 2023 |
| Vita 60 Ltd | Wholesale & retail | 2021 |
| Vital Recovery Antrim Ltd | Health & social care | 2026 |
| Vmii Ltd | Administrative & support | 2022 |
| Voltix Contracts Ltd | Construction | 2025 |
| W. G. Buchanan & SON Limited | Manufacturing | 1964 |
| W.D.T. Holdings Limited | Real estate | 1955 |
| Wallace Actuarial Services Ltd | Professional & scientific | 2024 |
| Wallace Gardens Management Company Limited | Households | 2024 |
| Wapping Lane Management Company Limited | Households | 2001 |
| Watro Digital Limited | Information & communication | 2014 |
| Wavelength Training Ltd | Transport & logistics | 2022 |
| Waveney Court Development Management Company Ltd | Households | 2023 |
| Waveney Management Company Limited | Extraterritorial | 2003 |
| Waynee Limited | Wholesale & retail | 2025 |
| WE ARE Kings Road Ltd | Information & communication | 2016 |
| WE Run Wild NI Limited | Arts & recreation | 2018 |
| Well Made Dwelling Ltd | Wholesale & retail | 2026 |
| Wellnessloft Carrickfergus CIC | Education | 2025 |
| WES Alam Ltd | Transport & logistics | 2023 |
| Whispering Pines Management Limited | Households | 2004 |
| Whitehead Coastguard Cottages Management Limited | Households | 2003 |
| Whitehead Community Association | Arts & recreation | 2010 |
| Whiteside Aerospace NI Ltd | Manufacturing | 2015 |
| Wicked Websites Ltd | Professional & scientific | 2020 |
| Willowtree Mews Management Company Ltd | Households | 2014 |
| Willy G Art Ltd | Arts & recreation | 2025 |
| Willy G Laser Ltd | Arts & recreation | 2025 |
| Willy G Tattoo Ltd | Arts & recreation | 2019 |
| Wilson House Property Ltd | Real estate | 2024 |
| Wilson House Property Management Ltd | Households | 2022 |
| Wilson Patterson and Sons Limited | Other services | 2013 |
| Wiltan Homes Ltd | Real estate | 2021 |
| WNR Electrical Ltd | Construction | 2013 |
| Wolf Fitness Education Ltd | Education | 2024 |
| Woodlawn Limited | Households | 2020 |
| Woodtown Management Company Limited | Households | 2007 |
| Worcon Arts & Media CIC | Information & communication | 2023 |
| WR Morgan Enterprises Limited | Real estate | 1985 |
| Wray Engineering Ltd | Manufacturing | 2019 |
| WS & MA Mcconnell Properties Limited | Real estate | 2005 |
| X Ventures U.K. Ltd | Professional & scientific | 2024 |
| Y NOT Recycle Ltd | Manufacturing | 2004 |
| YAU KEE Limited | Hospitality | 2024 |
| Yelo Limited | Manufacturing | 1983 |
| Yieldscout Limited | Information & communication | 2025 |
| Younearlyforgot Limited | Information & communication | 2025 |
| Your Home Interiors Ltd | Wholesale & retail | 2024 |
| Yts.It Limited | Information & communication | 2019 |