| Tanya Khan Aesthetics Ltd | Other services | 2018 |
| Target Europe Ltd. | Transport & logistics | 2024 |
| Target Healthcare (NI) Limited | Financial services | 2022 |
| Tatl Ltd | Wholesale & retail | 2022 |
| Taylor Capitol Ltd | Financial services | 2021 |
| Taylored Workwear Limited | Manufacturing | 2004 |
| Taylormade Decorators Ltd | Construction | 2025 |
| Taylormade Onboard Treatments Ltd | Other services | 2020 |
| TCM Dundee LLP | | 2011 |
| Tech IT From ME Ltd | Information & communication | 2022 |
| Tech Trade Recruiting Limited | Administrative & support | 2001 |
| Telequip (N.I.) Ltd | Information & communication | 2004 |
| Terra Studios Ltd | Manufacturing | 2021 |
| Tessa African Foods Limited | Hospitality | 2025 |
| TF 18 Ltd | Hospitality | 2016 |
| TF Networking Ltd | Administrative & support | 2024 |
| TH Fitness LLP | | 2012 |
| Thai 377 Ltd | Hospitality | 2023 |
| That Furniture Store Ltd | Wholesale & retail | 2025 |
| THE 1925 Group Ltd | Financial services | 2023 |
| THE BED Shop (N.I.) Ltd | Manufacturing | 2020 |
| THE Brow Craft Academy Ltd | Other services | 2020 |
| THE Bytes Project | Information & communication | 1993 |
| THE Camlin Group Ltd | Other services | 2024 |
| THE Complete Flooring Centre Limited | Wholesale & retail | 2019 |
| THE Fitt Method Ltd | Other services | 2024 |
| THE Fox's DEN Club Ltd | Education | 2019 |
| THE Glam Studio - Hair, Beauty & Academy Ltd | Education | 2020 |
| THE Influenced Accountant Ltd | Professional & scientific | 2025 |
| THE Little Beauty Rooms Ltd | Other services | 2019 |
| THE Little Bistro (Valley) Ltd | Hospitality | 2025 |
| THE Lodge Hotel (Coleraine) Limited | Hospitality | 2024 |
| THE Movement Station CIC | Education | 2026 |
| THE Moyle Investment Company Ltd | Financial services | 2022 |
| THE Olive Tree Deli Limited | Hospitality | 2026 |
| THE Riot Room Promotions Ltd | Information & communication | 2024 |
| THE Shannon Project Ltd | Construction | 2019 |
| THE Tandoori House Glen Ltd | Hospitality | 2025 |
| THE Transfer Tutor Ltd | Information & communication | 2020 |
| THE Wardrobe Belfast Ltd | Wholesale & retail | 2020 |
| THE WEE Bistro Ltd | Hospitality | 2019 |
| THF Enterprises Ltd | Real estate | 2019 |
| Thomas Mccrea & Co Ltd | Wholesale & retail | 2015 |
| Thompson Barr Consulting LLP | | 2014 |
| Thompson Management Limited | Real estate | 2018 |
| Threading Magic Northcott Ltd | Other services | 2019 |
| Tide Bathrooms Ltd | Construction | 2022 |
| Timeless NI Kitchens Ltd | Wholesale & retail | 2025 |
| Tiny Dots Ltd | Professional & scientific | 2022 |
| Tipican Ltd | Information & communication | 2021 |
| Titan Air Conditioning Ltd | Energy | 2013 |
| TJ Smyth & Sons Property Solutions Ltd | Construction | 2020 |
| Tkbini Ltd | Construction | 2020 |
| TKL Logistics Ltd | Transport & logistics | 2023 |
| TL Financial Ltd | Financial services | 2019 |
| TLA (N.I.) Ltd | Hospitality | 2019 |
| TLA Glazing Ltd | Construction | 2023 |
| TLA Property N.I. Ltd | Real estate | 2025 |
| TLC Internationl Ltd | Professional & scientific | 2026 |
| TMN Beauty Limited | Other services | 2025 |
| TMR (N.I.) Limited | Manufacturing | 1997 |
| TMS N.I. Ltd | Construction | 2022 |
| Tollymore Bridge Services Limited | Professional & scientific | 2018 |
| TOM Garcon Ltd | Wholesale & retail | 2017 |
| Toomacro Ltd | Wholesale & retail | 2024 |
| Top Properties MAX Ltd | Real estate | 2025 |
| Toranto Holdings Ltd | Financial services | 2022 |
| Total Event Catering Ltd | Hospitality | 2024 |
| Total Hemp Company Limited | Wholesale & retail | 2022 |
| Total ICT Services (N.I.) Limited | Wholesale & retail | 2006 |
| Touch of Class (N.I.) Limited | Transport & logistics | 2017 |
| Transfer Test Solutions Ltd | Education | 2023 |
| Travan Precision Engineering Ltd | Manufacturing | 1990 |
| Travel Time Coaches Ltd | Transport & logistics | 2024 |
| Treetops Development (N.I.) Limited | Extraterritorial | 2008 |
| Tribuiltme Ltd | Arts & recreation | 2025 |
| Trickster JIU Jitsu Ltd | Arts & recreation | 2020 |
| Triton Takeaway Ltd | Hospitality | 2025 |
| True Tech Group Ltd | Information & communication | 2025 |
| Truecash Limited | Information & communication | 2017 |
| Trusted Resources Limited | Energy | 2024 |
| TTT Belfast Ltd | Transport & logistics | 2025 |
| Turns & Marnoc Ltd | Wholesale & retail | 2026 |
| Turns Enterprise Limited | Wholesale & retail | 2021 |
| TVC Parts Limited | Wholesale & retail | 2007 |
| TVR Chakravartin Ltd | Professional & scientific | 2022 |
| Twiga Property Limited | Real estate | 2023 |
| Two Clouds Software Limited | Information & communication | 2025 |
| Tyrie Limited | Wholesale & retail | 2025 |
| U:Move Limited | Wholesale & retail | 2021 |
| UK Consumer Electronics Limited | | 1998 |
| Ulster Guild of Spar Grocers Limited-The | Professional & scientific | 1964 |
| Ultrabead Ltd | Manufacturing | 2020 |
| Umasa Food Ltd | Hospitality | 2024 |
| Unclocks Technologies Ltd | Information & communication | 2024 |
| Unicomp Computing Group Limited | | 1994 |
| Update Fire & Security Ltd | Other services | 2025 |
| Urban Affairs Ltd | Hospitality | 2021 |
| Urban Market Retail Ltd | Wholesale & retail | 2022 |
| Urologik North Limited | Health & social care | 2023 |