| TCD Property Holdings Limited | Real estate | 2023 |
| TCE Engineering Ltd | Construction | 2019 |
| TCS NI Limited | Hospitality | 2014 |
| TD Bricklaying Ltd | Construction | 2025 |
| TDB Associates Limited | Health & social care | 2001 |
| TDM Trade L.P. | | 2017 |
| Team CC Garments NI Ltd | Wholesale & retail | 2025 |
| Team Torres Martial Arts Ltd | Arts & recreation | 2018 |
| Tech Installations Ireland Limited | Construction | 2025 |
| Tech-Invest Consulting LP | | 2017 |
| Techno Trade Technology LP | | 2020 |
| Techsomo Ltd | Information & communication | 2026 |
| Techyteam Limited | Information & communication | 2012 |
| Teenie Weenies Daycare Limited | Health & social care | 2021 |
| Tegistics Consulting Limited | Information & communication | 2016 |
| Telos Nodas Ltd | Wholesale & retail | 2018 |
| Tempering NI Limited | Hospitality | 2024 |
| Tempo Promotions CIC | Arts & recreation | 2026 |
| Tenderloin Music Limited | Information & communication | 2024 |
| Tenofthose Limited | Wholesale & retail | 2007 |
| TEP Property Ltd | Real estate | 2024 |
| Terence Mackin Construction Limited | Construction | 2021 |
| Terra Equipment Limited | Construction | 2007 |
| Terra Holdings (NI) Limited | Professional & scientific | 2007 |
| Terra Imprints Limited | Construction | 2015 |
| Terra Nova Distributors Limited | Wholesale & retail | 2023 |
| Terra Solutions Holdings Limited | Financial services | 2023 |
| Terra Solutions Limited | Construction | 2010 |
| Terragrande Limited | Real estate | 2025 |
| Terravolt N I Ltd | Manufacturing | 2026 |
| TGG Promotions Limited | Professional & scientific | 2021 |
| That's US NOW Ltd | Hospitality | 2021 |
| THE Accessory Vault Ltd | Wholesale & retail | 2016 |
| THE Armagh Orchard Ltd | Wholesale & retail | 2026 |
| THE Armagh Orthodontic Clinic Ltd | Health & social care | 2008 |
| THE Auction Mechanic Ltd | Professional & scientific | 2025 |
| THE Beauty School Limited | Wholesale & retail | 2007 |
| THE Big Oak Coffee Company Ltd | Wholesale & retail | 2025 |
| THE Bread Shed Ltd | Manufacturing | 2025 |
| THE Broadcast Centre Limited | Other services | 2018 |
| THE Cabbage Patchers | Agriculture & fishing | 2012 |
| THE Chip and DIP Shop Limited | Hospitality | 2022 |
| THE Clybaun Clinic Limited | Health & social care | 2023 |
| THE COD END Ltd | Hospitality | 2025 |
| THE Cottage Hair Ltd | Other services | 2023 |
| THE Cross Border Orchestra of Ireland | Arts & recreation | 2007 |
| THE CUT Camlough Ltd | Other services | 2023 |
| THE Dress House Ireland Limited | Wholesale & retail | 2019 |
| THE Dresser Boutique Ltd | Wholesale & retail | 2026 |
| THE Fluttering Butterfly Limited | Wholesale & retail | 2024 |
| THE Founders LAB Ltd | Professional & scientific | 2025 |
| THE Free Presbyterian Mission Society Africa | Other services | 2013 |
| THE Friends of ST. Peter's GAA Club Warrenpoint Ltd | Administrative & support | 2023 |
| THE Galley Factory Limited | Manufacturing | 2026 |
| THE Galley Fish & Chip Shop Ltd | Hospitality | 2011 |
| THE Galley Fish & Chips Holding Ltd | Hospitality | 2020 |
| THE Gentle Dental Clinic Limited | Health & social care | 2010 |
| THE Good Trading and Sourcing Company N.I Limited | Wholesale & retail | 2023 |
| THE Growth Company (N.I.) Ltd | Information & communication | 2021 |
| THE Guru Kitchen Ltd | Hospitality | 2023 |
| THE Gym (N.I.) Limited | Arts & recreation | 2022 |
| THE Happy Self-Care Company Ltd | Public administration | 2019 |
| THE Health Grain Ltd | Manufacturing | 2018 |
| THE Hub Newry 2.0 Limited | Real estate | 2016 |
| THE Intervision Group Ltd | Construction | 2023 |
| THE Irish Bakers Benevolent Society | Other services | 1998 |
| THE Irish Mint Limited | Mining & quarrying | 2026 |
| THE Lantern Bar Limited | Hospitality | 2021 |
| THE Laundry Basket (NI) Ltd | Wholesale & retail | 2006 |
| THE Leaf and Bean Cafe Ltd | Hospitality | 2024 |
| THE Leak Doctor Ltd | Construction | 2015 |
| THE Little Meat Company Ltd | Manufacturing | 2018 |
| THE Lodge Gardens Hilltown Limited | Households | 2009 |
| THE Loft Newtownhamilton Ltd | Hospitality | 2024 |
| THE London Bar Consultants Ltd | Hospitality | 2013 |
| THE M Suite Ltd | Other services | 2023 |
| THE Matrix Sisters Limited | Health & social care | 2024 |
| THE Mcmahon Group Ltd | Construction | 2016 |
| THE Mcniece Project Management Company Limited | Households | 2005 |
| THE Menopause Coach Ltd | Other services | 2022 |
| THE Motorsport Hub Ltd | Professional & scientific | 2025 |
| THE Necessity Store Ltd | Wholesale & retail | 2025 |
| THE Newry Advertiser Limited | Professional & scientific | 2017 |
| THE Oaks Bar Limited | Hospitality | 2012 |
| THE Oaks Property Management Company Limited | Households | 2020 |
| THE Occupational Health Team Limited | Health & social care | 2013 |
| THE Oliver Newry Ltd | Hospitality | 2016 |
| THE Original Cranfield Touring Park Limited | Arts & recreation | 2003 |
| THE Parlour Annalong Ltd | Hospitality | 2021 |
| THE Parlour Camlough Limited | Manufacturing | 2019 |
| THE Party Rooms Ltd | Arts & recreation | 2025 |
| THE People's Flower Market Limited | Wholesale & retail | 2023 |
| THE Period Door Company Ltd | Manufacturing | 2024 |
| THE Phood Company (Bangor) Ltd | Hospitality | 2019 |
| THE Powerhouse Newry Limited | Health & social care | 2019 |
| THE Qualification Hub Limited | Education | 2020 |
| THE Quays Management Limited | Real estate | 2009 |
| THE Red Food Group Limited | Hospitality | 2019 |
| THE Reporter Rooms Ltd | Real estate | 2023 |
| THE Residences Portrush Ltd | Construction | 2024 |