| Stow Technologies Limited | Professional & scientific | 2024 |
| Strawberry Hill Residents Limited | Households | 2018 |
| Street Hawker Limited | Hospitality | 2024 |
| Strengthloft Carrickfergus Ltd | Arts & recreation | 2025 |
| Strictly Motocross Limited | Manufacturing | 2008 |
| Stroll Insurance Services Limited | Financial services | 1959 |
| Stylehack Limited | Other services | 2024 |
| Suesie Star Limited | Health & social care | 2024 |
| Summerhill Management Company Limited | Households | 2002 |
| Sun Kissed Tanning Lounge Ltd | Other services | 2023 |
| Sunbrae Properties Ltd | Real estate | 1995 |
| Sunlea Court Ltd | Wholesale & retail | 2000 |
| Super Tutors Academy Ltd | Education | 2021 |
| Superfry Carrick Ltd | Hospitality | 2015 |
| Swallowtail Subsea Ltd | Professional & scientific | 2012 |
| Swifts Quay Management Limited | Households | 1991 |
| Swizz Ltd | Manufacturing | 2023 |
| System Integration Solutions Ltd | Information & communication | 2016 |
| T. J. Warehouse Limited | Wholesale & retail | 2012 |
| T3PP Developments Limited | Real estate | 2013 |
| Tall HUT Ltd | Information & communication | 2023 |
| Tartan Hangers Ltd | Manufacturing | 2023 |
| Taylor Dresses Limited | Manufacturing | 2018 |
| Taylored Physique Coaching Ltd | Arts & recreation | 2024 |
| Taylors Manor Management Co Ltd | Households | 2005 |
| Teaching Cave Limited | Education | 2016 |
| Team Projects Properties Ltd | Households | 2023 |
| Tecanalyst Ltd | Professional & scientific | 2015 |
| TED Tech (NI) Ltd | Information & communication | 2020 |
| Tees in a POD Ltd | Administrative & support | 2024 |
| Tekenso Ltd | Information & communication | 2021 |
| Tempo Development N.I. Ltd | Other services | 2025 |
| TEN64 Ltd | Health & social care | 2022 |
| Terrier Group N.I. Ltd | Water & waste | 2017 |
| TG Electric Ltd | Construction | 2016 |
| TH Aero Services Ltd | Manufacturing | 2016 |
| THE 27.2 Consultancy Ltd | Professional & scientific | 2021 |
| THE Advantage Foundation Limited | Administrative & support | 1989 |
| THE Agency & Associates NI Limited | Real estate | 2023 |
| THE Ballycarry Chinese Ltd | Hospitality | 2025 |
| THE Black Knight Trading Centre Ltd | Wholesale & retail | 2012 |
| THE Brook Management Company Ltd | Real estate | 2010 |
| THE Carmichael Group Limited | Professional & scientific | 2015 |
| THE Chippy Carrick Ltd | Wholesale & retail | 2013 |
| THE Cithrah Foundation | Other services | 2002 |
| THE Courtyard (Abbey Road) Limited | Households | 2016 |
| THE DEN After School Club Ltd | Health & social care | 2017 |
| THE Drunken Duck Private Limited | Hospitality | 2026 |
| THE Functional Coach CIC | Arts & recreation | 2021 |
| THE Gallery Whitehead Limited | Arts & recreation | 2013 |
| THE Garage Door MAN Carrickfergus Ltd | Construction | 2022 |
| THE Golden Ticket Platform NI Ltd | Arts & recreation | 2025 |
| THE Greedy Gannet (Islandmagee) Limited | Hospitality | 2024 |
| THE Green Doctor (N.I.) Ltd | Wholesale & retail | 2020 |
| THE Gym Quarter West Limited | Arts & recreation | 2018 |
| THE Horizon Buildings Management Company Limited | Households | 2002 |
| THE Hybrid Academy Ltd | Wholesale & retail | 2020 |
| THE Khwopa Ltd | Wholesale & retail | 2025 |
| THE Kurdish Brothers Ltd | Other services | 2020 |
| THE Little Sweat Squad Ltd | Education | 2026 |
| THE Loft Home & Gift Ltd | Wholesale & retail | 2022 |
| THE Orchard Management Company (Carrickfergus) Limited | Households | 2022 |
| THE Raphael's Silverwings Limited | Hospitality | 2023 |
| THE Rejuve Room Ltd | Other services | 2020 |
| THE Rental Partnership Carrickfergus Ltd | Real estate | 2013 |
| THE Rental Partnership Larne Ltd | Real estate | 2013 |
| THE Rental Partnership Ltd | Real estate | 2011 |
| THE RJ Masood Ltd | Wholesale & retail | 2022 |
| THE Rolling Barrel Limited | Wholesale & retail | 2022 |
| THE Sean Casey Academy Ltd | Arts & recreation | 2021 |
| THE Slopes Management Limited | Households | 2010 |
| THE Ulster Consort CIC | Information & communication | 2021 |
| THE Wellnest Group Limited | Arts & recreation | 2018 |
| THE Wise Chair Ltd | Professional & scientific | 2025 |
| THE Yoga Loft (N.I.) Ltd | Health & social care | 2019 |
| Theamata Ltd | Information & communication | 2023 |
| Thetcc Limited | Wholesale & retail | 2023 |
| Third Space Coffee Ltd | Wholesale & retail | 2025 |
| This IS Arkham CIC | Arts & recreation | 2024 |
| Thompson Lift Truck Services Limited | Manufacturing | 2021 |
| Thompson Manor Management Company Ltd | Households | 2008 |
| Thompson Mitchell Hunter Group Ltd | Professional & scientific | 2026 |
| Thompson's Point Management Company Limited | Households | 2006 |
| Thomson Trading Ltd | Wholesale & retail | 2024 |
| Three Element LOGISTICS-(3EL)- Ltd | Transport & logistics | 2012 |
| THREE6 Car Sales Ltd | Wholesale & retail | 2025 |
| Thrive Business Consulting Ltd | Professional & scientific | 2025 |
| Thunk Creative (N.I.) Ltd | Administrative & support | 2016 |
| Tides Brazilian Jiu-Jitsu Academy Limited | Arts & recreation | 2024 |
| Tiobraid Engineering Ltd | Manufacturing | 2021 |
| Tiptop N.I. Ltd | Transport & logistics | 2026 |
| Tirnaform Ltd | Other services | 2019 |
| TMW Electrical (N.I.) Ltd | Construction | 2026 |
| Toddler Sense North East NI Ltd | Education | 2025 |
| Todotech Ltd | Education | 2017 |
| Tokyo's Asian Street Food Ltd | Hospitality | 2022 |
| Tonkawa Gaming Ltd | Administrative & support | 2015 |
| Topmark Decorating Ltd | Construction | 2022 |
| Tour Start Golf Scholarships Ltd | Education | 2026 |
| Toza Ltd | Wholesale & retail | 2026 |