| Torre Nominee Holdings Limited | Real estate | 2016 |
| Torre Nominee NO. 1 Limited | Real estate | 2016 |
| Torre Nominee NO. 2 Limited | Real estate | 2016 |
| Total Perfection Ltd | Wholesale & retail | 2011 |
| Touchline Referee Retail Ltd | Wholesale & retail | 2024 |
| Tourist Wise Ltd | Arts & recreation | 2019 |
| TOW and Go Skips Limited | Water & waste | 2025 |
| Town Fuels Ltd | Wholesale & retail | 2021 |
| Townhill Court Management Company Limited | Households | 2007 |
| Townparks Trading Ltd | Hospitality | 2025 |
| Transform the World Limited | Other services | 2018 |
| Transformation Services Limited | Administrative & support | 1995 |
| Transforming Lives and Communities | Other services | 2010 |
| Traynor Plant Services Limited | Other services | 2024 |
| Trevor Barr's Butchers and Deli Ltd | Manufacturing | 2016 |
| Tri-Heat Limited | Construction | 2011 |
| Trostan Contracting Limited | Professional & scientific | 2025 |
| TRT Driver Hire Ltd | Construction | 2016 |
| Truenue Ltd | Wholesale & retail | 2022 |
| TS Composites Ltd | Manufacturing | 2021 |
| TSF Rents Ltd | Real estate | 2023 |
| Tsmg Consulting Ltd. | Professional & scientific | 2017 |
| TSN Commercials Ltd | Wholesale & retail | 2024 |
| TST Express Limited | Transport & logistics | 2021 |
| TST Holdings (NI) Limited | Financial services | 2018 |
| TST Logistics Services Ltd | Transport & logistics | 2018 |
| TST Transport Ltd | Transport & logistics | 2013 |
| Tully Contracts Ltd | Construction | 2021 |
| Tully Phase 2 Limited | Energy | 2021 |
| Tullyglass House Hotel Limited | Hospitality | 2015 |
| Tullyheron Ltd | Extraterritorial | 2013 |
| Tullyview Ltd | Administrative & support | 2016 |
| Tungsten Developments Limited | Administrative & support | 2005 |
| Tuppenny Prestige Ltd | Wholesale & retail | 2025 |
| Tuppenny Solutions Ltd | Professional & scientific | 2021 |
| Tuppenny Support Ltd | Professional & scientific | 2024 |
| Turkish Kebab & Pizzeria House Ltd | Hospitality | 2025 |
| Turner Opticians Ltd | Professional & scientific | 2013 |
| Turnstone Management Systems Ltd | Professional & scientific | 2025 |
| Tuscany Tiles & Bathrooms Limited | Wholesale & retail | 2006 |
| TW Support Services Ltd | Health & social care | 2023 |
| TWC Property Maintenance Ltd | Construction | 2023 |
| Twelve Lions Properties | Real estate | 1984 |
| Twenty Lions Properties | Real estate | 1991 |
| Twisted Sisters Ecom Limited | Wholesale & retail | 2024 |
| Two OR Four Limited | Financial services | 2005 |
| Two Trees Recovery Services & Co. | Transport & logistics | 2010 |
| UDS Clearances Limited | Transport & logistics | 2023 |
| UDS Distribution Limited | Transport & logistics | 2025 |
| UDS Freight Ltd | Administrative & support | 2021 |
| UDS Holdings Limited | Financial services | 2023 |
| UDS Warehousing Limited | Transport & logistics | 2023 |
| Ulster Care Ltd | Health & social care | 2025 |
| Underwood Entertainments (Belfast) Limited | Professional & scientific | 1939 |
| Unilink Technology Hub Ltd | Information & communication | 2022 |
| UQS Holdco Limited | Construction | 2026 |
| Urban Edge Interiors Ltd | Administrative & support | 2025 |
| Urban Stay Rentals Ltd | Hospitality | 2024 |
| Urban Tech Ltd | Wholesale & retail | 2024 |
| Ursula Madden Hair Studio Limited | Other services | 2017 |
| Utility Bear Limited | Wholesale & retail | 2022 |
| V B Blind Systems Ltd | Wholesale & retail | 2005 |
| Valdez Gymnastics Club CIC | Arts & recreation | 2017 |
| Valueworld NI Limited | Wholesale & retail | 2026 |
| Vent Controls Limited | Energy | 2010 |
| Veterinary Northern Ireland | Administrative & support | 2005 |
| Veterinary Resources (NI) Ltd | Professional & scientific | 2014 |
| Vibrant White Construction Ltd | Construction | 2022 |
| Vibrant White Property & Development Ltd | Real estate | 2021 |
| Vic&Hil. Ltd | Hospitality | 2019 |
| Vienly Nails Ltd | Other services | 2025 |
| Village Electrics (NI) Limited | Wholesale & retail | 2016 |
| Village Floors Limited | Wholesale & retail | 2015 |
| Village Garden (Broughshane) Limited -the | Other services | 1998 |
| Village Inn (Portglenone) Ltd | Hospitality | 2012 |
| Vincent Rainey Finance Limited | Administrative & support | 2018 |
| Vingabal Limited | Manufacturing | 1979 |
| Viofeel Ltd | Manufacturing | 2024 |
| Vision Heat Solutions Limited | Manufacturing | 2013 |
| Vitaminality Ltd | Wholesale & retail | 2017 |
| Voucher Suite Ltd | Information & communication | 2023 |
| Vulcan Asphalt Group Limited | Mining & quarrying | 2016 |
| W & a Mcmaster Ltd | Agriculture & fishing | 2015 |
| W Allen Meats Limited | Manufacturing | 2025 |
| W J J (Ireland) Limited | Arts & recreation | 2003 |
| W J Mcerlean Limited | Real estate | 2016 |
| W R Kennedy & Company | Wholesale & retail | 2002 |
| W Thompson Transport Limited | Transport & logistics | 2019 |
| W. M. Mccosh (Antrim) Limited | Wholesale & retail | 1982 |
| Wallace Enterprises Holdings Limited | Financial services | 2024 |
| Wallace Enterprises Limited | Real estate | 1990 |
| Walter Young Limited | Wholesale & retail | 1975 |
| Warden Properties Limited | Real estate | 2015 |
| Warden Street Apartments Management Limited | Households | 2005 |
| Warwick Engineering (NI) Limited | Construction | 2007 |
| Washroom Consultancy Limited | Professional & scientific | 2026 |
| Water Treatment Technologies Ltd | Extraterritorial | 2022 |
| Waterfall Aesthetics Limited | Other services | 2024 |
| Waveney Tyres Ltd. | Wholesale & retail | 2020 |
| Wavetop Services Ltd | Information & communication | 2019 |