| SVR Systems Ltd | Professional & scientific | 2019 |
| Swift and Sure Training Ltd | Health & social care | 2025 |
| Swim Magheralin Ltd | Education | 2025 |
| Swish Ltd | Information & communication | 2017 |
| SWR Properties Ltd | Construction | 2013 |
| Synergy Advertising Ltd | Professional & scientific | 2023 |
| Synergy Pop-Solutions Limited | Professional & scientific | 1994 |
| System Certification Services Limited | Professional & scientific | 2015 |
| System Logistics NI Limited | Other services | 2023 |
| T and G Corrie Ltd | Wholesale & retail | 2002 |
| T Crawford Cars Ltd | Wholesale & retail | 2018 |
| T M Campbell & SON Ltd | Construction | 2007 |
| T Mccorry Contracts Limited | Construction | 2015 |
| T&D Catering Limited | Hospitality | 2024 |
| T&T Mediterranean Restaurant Ltd | Hospitality | 2019 |
| T, C & J2 Limited | Health & social care | 2012 |
| T.A Car Multimedia Installation Limited | Wholesale & retail | 2024 |
| T.L.C. (NI) Ltd | Professional & scientific | 2005 |
| T3F Group Limited | Transport & logistics | 2020 |
| Tabat 87 Ltd | Health & social care | 2022 |
| Tail Productions Limited | Information & communication | 2018 |
| Take Shipping Ltd | Transport & logistics | 2025 |
| Tamet Ltd | Hospitality | 2019 |
| Tanksafe Solutions Ltd | Manufacturing | 2002 |
| Tanya Rolf Beauty and Skincare Clinic Limited | Health & social care | 2016 |
| Tanzania Christian Trust | Other services | 2025 |
| Taocaogg Ltd | Wholesale & retail | 2025 |
| TAW Contracts Ltd | Construction | 2023 |
| TBA Contracts Limited | Construction | 2012 |
| TBR Accident Repair Centre Ltd | Wholesale & retail | 2025 |
| TBR Hightech Limited | Wholesale & retail | 2024 |
| TD - Transport & Distribution LLP | | 2018 |
| TDH Electrical NI Limited | Construction | 2024 |
| TDR Transport Solutions Ltd | Transport & logistics | 2025 |
| Teal Visual Ltd | Professional & scientific | 2026 |
| Team Stewart Aesthetics Ltd | Other services | 2025 |
| Team Stewart Training Limited | Arts & recreation | 2021 |
| Teambuildireland Limited | Arts & recreation | 2005 |
| Techmac Engineering Supplies Limited | Wholesale & retail | 2020 |
| Technicall Fire and Security Ltd | Administrative & support | 2024 |
| Technilux Limited | Information & communication | 2022 |
| Technosoft Solutions Limited | Administrative & support | 2017 |
| Teck Rocketry Ltd | Wholesale & retail | 2026 |
| Tectra Limited | Information & communication | 2024 |
| Ted’S Property Ltd | Construction | 2025 |
| Temple (N.I.) Limited | Wholesale & retail | 2015 |
| Temple Gardens Ireland Limited | Wholesale & retail | 2024 |
| Temple Golf Club Limited | Arts & recreation | 2017 |
| Temple Motor Cycle & Athletic Club Limited | Arts & recreation | 1958 |
| Tempted Cider Company Limited | Manufacturing | 2015 |
| Tengyun HK Limited | Wholesale & retail | 2026 |
| TES - Transportation Express Services LLP | | 2018 |
| Tessa Lisburn Limited | Other services | 2022 |
| Texam Limited | Manufacturing | 1973 |
| Thai Kitchen Lisburn Ltd | Hospitality | 2026 |
| Thai Massage Lisburn Ltd | Health & social care | 2016 |
| THE Landscape Company (NI) Ltd | Administrative & support | 2007 |
| THE Air Ambulance Northern Ireland | Transport & logistics | 2015 |
| THE Alexander Group Holdings Limited | Professional & scientific | 1976 |
| THE Arzen Collective Ltd | Wholesale & retail | 2025 |
| THE Autogrid Used Car Centre Ltd | Wholesale & retail | 2016 |
| THE Baldy Barber Ltd | Other services | 2022 |
| THE Barber Co (NI) Limited | Real estate | 2025 |
| THE Barber Shop Lisburn Ltd | Other services | 2023 |
| THE Beauty Bar BOW Street Ltd | Other services | 2019 |
| THE Beauty Bar Lisburn Ltd | Other services | 2022 |
| THE Belfast Arms Company Limited | Wholesale & retail | 2005 |
| THE Care & Assist Company Ltd | Health & social care | 2008 |
| THE Cave Newsagents Ltd | Wholesale & retail | 2020 |
| THE Change Carbon Limited | Professional & scientific | 2025 |
| THE Change General Partner LLP | | 2025 |
| THE Change Impact Group Limited | Financial services | 2024 |
| THE Change Impact Ltd | Other services | 2025 |
| THE Change Innovation Services Ltd | Information & communication | 2019 |
| THE Change Intellectual Property Limited | Financial services | 2020 |
| THE Change IP Ltd | Professional & scientific | 2022 |
| THE Change Venture Capital Fund LP | | 2025 |
| THE Change Venture Capital Limited | Financial services | 2019 |
| THE Ciggie Shop Graham Gardens (NI) Ltd | Wholesale & retail | 2017 |
| THE Ciggie Shop Mourne (NI) Ltd | Wholesale & retail | 2017 |
| THE Ciggie Shop Portadown (NI) Ltd | Wholesale & retail | 2016 |
| THE Cloud Simplified Limited | Information & communication | 1998 |
| THE Coast Bar & Restaurant Ltd | Hospitality | 2018 |
| THE Collective Software Group Limited | Information & communication | 2026 |
| THE Commons Belleek Management 2010 Limited | Households | 2010 |
| THE Cornerstone Trust | Other services | 2016 |
| THE Cruise Life Group Ltd | Information & communication | 2024 |
| THE Dog House Groomers Lisburn Ltd | Administrative & support | 2023 |
| THE Floor Store Online Ltd | Wholesale & retail | 2026 |
| THE Foot Factory Limited | Wholesale & retail | 2011 |
| THE Funky Baker Ltd | Manufacturing | 2026 |
| THE German Van Company Ltd | Administrative & support | 2011 |
| THE Giving Stream Ireland Ltd | Hospitality | 2020 |
| THE Greeks P.A. Ltd | Hospitality | 2023 |
| THE Handyman of Hillsborough Limited | Other services | 2023 |
| THE Hydro Guys Ltd | Administrative & support | 2024 |
| THE Irish Equine Rehabilitation and Fitness Centre Ltd | Agriculture & fishing | 2017 |
| THE Journey Church | Other services | 2014 |
| THE Krypt Ltd | Wholesale & retail | 2024 |
| THE Last Castle Limited | Administrative & support | 2018 |