| SVM Investments | Extraterritorial | 2002 |
| SVM Property Investments Limited | Real estate | 2021 |
| SW Electrics (NI) Limited | Construction | 2021 |
| T & D Brick Specials Ltd | Construction | 2016 |
| T & D Network Services Ltd | Professional & scientific | 2017 |
| T Calderwood Transport Limited | Transport & logistics | 2025 |
| T Connon Farms Limited | Agriculture & fishing | 2020 |
| T Kirk Fibre Solutions Ltd | Construction | 2025 |
| T1 Projects Ltd | Professional & scientific | 2014 |
| TAG Accountants (N.I.) Limited | Professional & scientific | 2020 |
| Talis Construction Ltd | Construction | 2018 |
| Tambayan Limited | Wholesale & retail | 2025 |
| Tamla Construction Limited | Construction | 2014 |
| Tank Supply Ltd | Administrative & support | 2015 |
| Tannybreak Limited | Financial services | 2020 |
| Tayian Aero Limited | Professional & scientific | 2021 |
| TC Electrical & Sons Ltd | Construction | 2023 |
| Tcssl Ltd | Wholesale & retail | 2024 |
| TD Kernohan Limited | Real estate | 2025 |
| TDG Consulting Services Ltd | Information & communication | 2016 |
| TEC Associates Limited | Other services | 2007 |
| Tecco Construction Ltd | Construction | 2018 |
| Technical Transport Products Limited | Manufacturing | 2011 |
| Templemoyle Mills Ltd | Financial services | 2013 |
| TEN Second Ltd | Hospitality | 2026 |
| Tenza Healthcare Limited | Health & social care | 2017 |
| Tgffarming Ltd | Agriculture & fishing | 2025 |
| THE Anchor Church North Antrim Ltd | Other services | 2023 |
| THE ARK Drumcon Ltd | Wholesale & retail | 2024 |
| THE Bath Bubble Ltd | Wholesale & retail | 2019 |
| THE Battery Property & Management Ltd | Households | 2025 |
| THE Braid Development Group Ltd | Health & social care | 2021 |
| THE Cara and Knocken Lodge Care Homes Ltd | Health & social care | 2017 |
| THE Cara Care Home Ltd | Health & social care | 2026 |
| THE Carbon Neutral Cattle Company Limited | Agriculture & fishing | 2020 |
| THE Ciggie Shop Ballymena (NI) Ltd | Wholesale & retail | 2016 |
| THE Clear Head Limited | Wholesale & retail | 2020 |
| THE Copper Barns Management Company Limited | Households | 2016 |
| THE Cornmill Estate Management Company Limited | Households | 2009 |
| THE Country Garage Ballymena Ltd | Wholesale & retail | 2026 |
| THE Doury Frier Ltd | Hospitality | 2022 |
| THE Federation of Passenger Transport Northern Ireland Limited | Other services | 2008 |
| THE Francina Foundation | Other services | 2015 |
| THE Future Beyond Ltd | Wholesale & retail | 2023 |
| THE Galgorm Club Ltd | Arts & recreation | 2026 |
| THE Gateway Social Investment Limited | Manufacturing | 2013 |
| THE Gentry Barber (N.I.) Ltd | Other services | 2022 |
| THE Glens of Antrim Whiskey Company Limited | Manufacturing | 2012 |
| THE Happy Villa Ballymena Ltd | Hospitality | 2024 |
| THE Hideaway @ 41 Ltd | Hospitality | 2025 |
| THE High Sheriffs' Association of Northern Ireland | Other services | 2023 |
| THE Hpkc Limited | Manufacturing | 2012 |
| THE John Reid Foundation | Professional & scientific | 2016 |
| THE Larder Zero Waste Ltd | Wholesale & retail | 2019 |
| THE Manner House Ballymena Ltd | Hospitality | 2025 |
| THE Manner House Restaurant Ltd | Hospitality | 2026 |
| THE Mighty Pulse Limited | Manufacturing | 2020 |
| THE Mission Worldwide | Professional & scientific | 2007 |
| THE Mushroom House Glenarm Limited | Hospitality | 2025 |
| THE Music Rooms Antrim Limited | Other services | 2013 |
| THE Music Rooms Ballymena Limited | Other services | 2013 |
| THE Music Rooms Entertainment Ltd | Arts & recreation | 2018 |
| THE Music Rooms Retail Ltd | Other services | 2018 |
| THE Norn Irish Gift Shop Ltd | Wholesale & retail | 2023 |
| THE Philippines AID Project Limited | Other services | 2017 |
| THE Pizza Box Portglenone Limited | Hospitality | 2022 |
| THE Pretty Useful MAP Company Limited | Information & communication | 2011 |
| THE Proper Melt Company Ltd | Manufacturing | 2025 |
| THE Salty COW Ltd | Hospitality | 2026 |
| THE Scruffy Hair Company Ltd | Wholesale & retail | 2023 |
| THE Spirit of 68 Ltd | Arts & recreation | 2024 |
| THE Spotted Fleece Ltd | Hospitality | 2022 |
| THE Therapy Rooms Hotel Retreat Limited | Health & social care | 2024 |
| THE Ticket Bakehouse Headquarters Ltd | Manufacturing | 2026 |
| THE WEE Shap @ the Station Ltd | Wholesale & retail | 2024 |
| THE White Butterfly Foundation C.I.C. | Manufacturing | 2024 |
| THE Zero Carbon Cattle Company Limited | Agriculture & fishing | 2020 |
| Thecollectorhub Ltd | Wholesale & retail | 2025 |
| Third Dimension (3D) Semiconductor Limited | Administrative & support | 2025 |
| THIRTY84 Ltd | Professional & scientific | 2023 |
| Thompson Asset Partnership Limited | Professional & scientific | 2013 |
| Thompson Car & Commercial Repairs Ltd | Wholesale & retail | 2025 |
| THR33 Rings Limited | Arts & recreation | 2021 |
| Three IT Services Ltd | Information & communication | 2023 |
| Threefold Ltd | Information & communication | 2025 |
| Timberleaf Designs LLP | | 2020 |
| Time Square Coffee House Ltd | Hospitality | 2015 |
| Time to Soar CIC | Wholesale & retail | 2020 |
| Tinsdale Specialist Joinery Ltd. | Manufacturing | 2011 |
| TJ Morrison & Sons Limited | Professional & scientific | 2005 |
| TKS Contracts Ltd | Manufacturing | 2011 |
| TM Legal Consultancy Limited | Other services | 2020 |
| TM Optix Ltd | Wholesale & retail | 2024 |
| Toberwine Ltd | Real estate | 2025 |
| Tollymore Services Ltd | Mining & quarrying | 2020 |
| Tomintoul Property Ltd | Real estate | 2024 |
| Tools on the Move Ltd | Administrative & support | 2020 |
| Tops and Dresses Limited | Wholesale & retail | 2014 |
| Torquetronix Limited | Wholesale & retail | 2023 |
| Torre Asset Management Limited | Real estate | 2016 |