| Taurus Hold Co Ltd | Financial services | 2021 |
| TCD Propco Limited | Real estate | 2026 |
| Teambackerni Ltd | Arts & recreation | 2026 |
| Technical Education Centre Open Learning Ltd | Education | 2014 |
| Teknos Ireland Limited | Manufacturing | 1993 |
| TEL Azekah Ltd | Information & communication | 2026 |
| Templared Limited | Hospitality | 2013 |
| Terracon Ltd | Professional & scientific | 2018 |
| TGB Farms Ltd | Agriculture & fishing | 2024 |
| Tgni Ltd | Wholesale & retail | 2017 |
| THE Barber Shop R US Ltd | Other services | 2013 |
| THE Business Success Hub Ltd | Professional & scientific | 2019 |
| THE Catch UP Cafe Ltd | Hospitality | 2021 |
| THE Commercial Flooring Guys Ltd | Construction | 2022 |
| THE Cosy Inn Ltd | Hospitality | 2020 |
| THE Country Homeware Company Ltd | Wholesale & retail | 2024 |
| THE Customer Bureau Ltd | Administrative & support | 2018 |
| THE Greenyard (NI) Limited | Professional & scientific | 2011 |
| THE Lady Accountant Ltd | Professional & scientific | 2025 |
| THE Lighthouse (Magherafelt) Ltd. | Other services | 2015 |
| THE Little Green Feather Company Limited | Wholesale & retail | 2020 |
| THE Lough Ltd | Real estate | 2025 |
| THE Market Yard (NI) Ltd | Real estate | 2012 |
| THE MID Ulster Clinic Healthcare Ltd | Health & social care | 2020 |
| THE Mums at Work Network C.I.C. | Education | 2022 |
| THE Office Two Ltd | Hospitality | 2023 |
| THE Office(Ni) Ltd | Hospitality | 2020 |
| THE Old School Moneymore Ltd | Other services | 2026 |
| THE Olive Branch (Respecting Minds) | Health & social care | 2018 |
| THE PUB Warehouse Ltd | Hospitality | 2023 |
| THE PUB Warehouse NO. 2 Ltd | Hospitality | 2023 |
| THE Vault Recovery Ltd | Arts & recreation | 2025 |
| Theonlineconnection Ltd | Wholesale & retail | 2011 |
| Thorn Fitout Limited | Construction | 2024 |
| Three Spires House Limited | Households | 2015 |
| Tile Gallery (Toome) Limited - the | Wholesale & retail | 2004 |
| Tiletidy Ltd | Construction | 2014 |
| Tim's Foods Ltd | Wholesale & retail | 2025 |
| Time & Tech NI Ltd | Wholesale & retail | 2025 |
| TIN Bridge Investments Limited | Real estate | 2021 |
| TIP Top Services Ltd | Administrative & support | 2026 |
| Tir-Con Engineering Ltd | Manufacturing | 2000 |
| Tir-Con Holdings Ltd | Financial services | 2024 |
| Tir-Con Ltd | Financial services | 2025 |
| Tirgan Community Association | Arts & recreation | 2010 |
| TK Precast Services Ltd | Construction | 2025 |
| TMC Hire Ltd | Wholesale & retail | 2015 |
| Toberhead Farms Limited | Agriculture & fishing | 2016 |
| Tobermore Concrete Products Limited | Manufacturing | 1976 |
| Tobermore Paving Products Limited | Extraterritorial | 1962 |
| Tobermore Quarries Limited | Manufacturing | 2023 |
| Tobermore Trading Group Ltd | Manufacturing | 2024 |
| Toner Holdings Limited | Financial services | 2019 |
| Toner Management Services Limited | Manufacturing | 2020 |
| Toner's Supermarkets | Wholesale & retail | 1996 |
| Toome Industrial Developments Limited | Real estate | 1995 |
| Top Gear Alloys Ltd | Wholesale & retail | 2019 |
| Top Source Recruitment Ltd | Administrative & support | 2024 |
| Total Field Solutions Limited | Information & communication | 2015 |
| Total GPS Ltd | Professional & scientific | 2013 |
| Tout Pouvoir Limited | Financial services | 2026 |
| Tout Pouvoir Seanair Limited | Financial services | 2026 |
| Tout Pouvoir Teaghlach Limited | Financial services | 2026 |
| Traad Enterprises Limited | Administrative & support | 2000 |
| Traad Nurseries Ltd | Wholesale & retail | 2006 |
| Tradestone Driveways Ltd | Administrative & support | 2022 |
| Trench Road Developments Limited | Construction | 2019 |
| Trend Kitchens Bedrooms Ltd | Manufacturing | 2025 |
| Trevor Knox Ltd | Agriculture & fishing | 2017 |
| Tri-Met Limited | Professional & scientific | 1977 |
| Trogna | Construction | 2021 |
| Trosca Ltd | Construction | 2017 |
| Truwash Ltd | Wholesale & retail | 2019 |
| Tulach Properties Ltd | Construction | 2018 |
| Turco Properties Limited | Real estate | 2016 |
| Turkish ZH Barber Ltd | Other services | 2025 |
| Ulidia Services Limited | Construction | 2019 |
| Ulster Engineering Limited | Manufacturing | 1970 |
| Ulster Karting Club Limited | Arts & recreation | 1969 |
| Ultimate Fitness Mid-Ulster Ltd | Arts & recreation | 2026 |
| Union RD Property Limited | Real estate | 2019 |
| Union Road Chip Shop Limited | Hospitality | 2012 |
| Upkeep Matters Ltd | Construction | 2023 |
| Urban Gatherings Ltd | Hospitality | 2025 |
| USE Developments Ltd. | Real estate | 2007 |
| Ussher Consulting Services Ltd | Professional & scientific | 2022 |
| Uzziel Ltd | Real estate | 2026 |
| V5ROOFING Limited | Construction | 2026 |
| Valor Genesis Ltd | Construction | 2022 |
| Valor Homes Ltd | Construction | 2004 |
| Valor Power Holdco Limited | Financial services | 2026 |
| Valor Power Limited | Financial services | 2024 |
| Valor Private Finance Ltd | Financial services | 2014 |
| Vemac Engineering Ltd | Manufacturing | 2003 |
| Ventura Scaling Limited | Wholesale & retail | 2024 |
| Ventus Management Services Ltd | Administrative & support | 2021 |
| Ventus Solaris Asset Management Ltd | Professional & scientific | 2025 |
| Venue 71 Ltd | Hospitality | 2023 |
| Veriteer Ltd | Information & communication | 2017 |
| Verity Pensions Limited | Financial services | 2012 |