| Thomas Riley Ltd | Information & communication | 2014 |
| Three Countries Food Limited | Wholesale & retail | 2019 |
| Three Creative Company Ltd | Manufacturing | 2003 |
| TIF Trading Ltd | Wholesale & retail | 2019 |
| Timberframe Structures Limited | Construction | 2012 |
| Tinka Todorova Services Ltd | Wholesale & retail | 2025 |
| TK Transport Ireland Limited | Transport & logistics | 2005 |
| TML Biomed Services Ltd | Professional & scientific | 2023 |
| Tomat Contracts Ltd | Construction | 2025 |
| Top Survey (IRE) Ltd | Construction | 2024 |
| Torney Car & Commercial Ltd | Wholesale & retail | 2019 |
| TR Trucks Ltd | Manufacturing | 2019 |
| Trackars Solutions Limited | Real estate | 2009 |
| Trans Secure Ltd | Transport & logistics | 2017 |
| Traynor's Bar and Restaurant Ltd | Hospitality | 2026 |
| Treasures Gifts Ltd | Wholesale & retail | 2011 |
| Tree Fellows (Northern Ireland) Limited | Administrative & support | 2024 |
| Treeple Ltd | Other services | 2012 |
| Triggerappy Ltd | Information & communication | 2010 |
| Triggerpay Tech Ltd | Information & communication | 2025 |
| True Harvest Seeds | Agriculture & fishing | 2013 |
| TSG Building and Maintenance (NI) Ltd | Construction | 2019 |
| Tullyhill Fresh Produce Limited | Agriculture & fishing | 2020 |
| Tullynacree Properties Limited | Real estate | 2017 |
| Turley Properties Limited | Administrative & support | 2005 |
| Tyrella Beach House Ltd | Hospitality | 2025 |
| UMI Downpatrick Ltd | Hospitality | 2025 |
| UMI Eats Ltd | Hospitality | 2026 |
| UMI Modern Fast Food Limited | Hospitality | 2023 |
| Umlaut SNO Ltd | Wholesale & retail | 2020 |
| Unified Fitness Ltd | Arts & recreation | 2022 |
| Uniko Restaurants Limited | Hospitality | 2015 |
| United Mortgages Downpatrick Ltd | Financial services | 2014 |
| Unity Infosys Ltd | Wholesale & retail | 2025 |
| Valk Entertainment Ltd | Wholesale & retail | 2018 |
| VDP Crossgar Ltd | Health & social care | 2024 |
| Velocity AG Limited | Wholesale & retail | 2018 |
| Veterinary Equine Solutions Limited | Professional & scientific | 2020 |
| Veterinary Equine Tools Limited | Professional & scientific | 2021 |
| Veterinary Extras Ltd. | Professional & scientific | 2012 |
| VH 8 Ltd | Hospitality | 2016 |
| Virgo Imports NI Limited | Agriculture & fishing | 2020 |
| Virtus Caritatis Ltd | Professional & scientific | 2024 |
| Vital Accident Management Group Ltd | Wholesale & retail | 2023 |
| Vivomed Ltd | Health & social care | 2000 |
| Vrni Limited | Information & communication | 2016 |
| VSR Properties DPK NI Limited | Real estate | 2026 |
| Wall 2 Floor Ceramic Tiling Limited | Construction | 2017 |
| Wallace Electrical Contracts Ltd | Construction | 2018 |
| Watters Incorporated Ltd | Professional & scientific | 2020 |
| Wayne Bryant Lean Consultant Ltd | Professional & scientific | 2023 |
| WE AS One Limited | Health & social care | 2025 |
| Wenduo Qingou Limited | Wholesale & retail | 2025 |
| Werewolf Food Ltd | Other services | 2016 |
| Whitehills Holdings Ltd | Financial services | 2025 |
| Whitethorn Joinery Contracts Ltd | Manufacturing | 2018 |
| Whytes of Crossgar Ltd | Wholesale & retail | 2008 |
| Whytes of Crossgar Properties Limited | Financial services | 2024 |
| William M Lindsay Ltd | Wholesale & retail | 2013 |
| Wolfhound Direct Limited | Wholesale & retail | 2018 |
| Wonder Wins Ltd | Arts & recreation | 2023 |
| Woodland & Coastal Play - Training & Consultancy Ltd | Education | 2026 |
| Wordmagic Limited | Administrative & support | 2014 |
| WOW Sport Therapy Ltd | Other services | 2018 |
| WPR Properties Ltd | Real estate | 2024 |
| Yard Box Ltd | Construction | 2020 |
| Yarrum Plumbing and Heating Engineers Ltd | Construction | 2017 |
| Yelo Publishing PD Ltd | Information & communication | 2022 |
| Zbsi Ltd | Information & communication | 2017 |
| Zoomlion Machinery & Plant Ltd | Wholesale & retail | 2024 |