| J MCD Property Ltd | Real estate | 2025 |
| JA Multimedia Ltd | Information & communication | 2026 |
| JAG Solar Ltd | Construction | 2024 |
| Jameson Consultancy Limited | Professional & scientific | 1995 |
| JB Estate Agents Ltd | Real estate | 2024 |
| JDM Rentals Ltd | Construction | 2026 |
| Jebco Foods Limited | Manufacturing | 2017 |
| JMC Investment Properties Ltd | Real estate | 2025 |
| Joan Corbett Design Ltd | Professional & scientific | 2023 |
| Joseph Morton Ltd | Agriculture & fishing | 2018 |
| JR Electrical & Plastering Ltd | Construction | 2023 |
| JRA Autoquip (NI) Limited | Wholesale & retail | 1977 |
| Jungle Brands Ltd | Wholesale & retail | 2019 |
| K-Tech Suspension Limited | Manufacturing | 2001 |
| KB Foodstyling Ltd | Hospitality | 2024 |
| Keel Contractors Limited | Construction | 2004 |
| Ken-Co Design Ltd | Professional & scientific | 2008 |
| Kenmore Contracts Ltd | Construction | 2019 |
| Kerbstone Construction Ltd | Construction | 2025 |
| Kerr Commerce Limited | Wholesale & retail | 2021 |
| Kids Fashions Ltd | Wholesale & retail | 2023 |
| Kingstonford Group Ltd | Construction | 2022 |
| Kinloch IT Solutions Ltd | Information & communication | 2025 |
| KJE Contracts Ltd | Professional & scientific | 2024 |
| KL Homes Ltd | Construction | 2011 |
| Ktps (Global) Ltd | Construction | 2021 |
| Laganvale Enterprises Ltd | Real estate | 2015 |
| Laganvale Mews Management Limited | Extraterritorial | 1994 |
| LCT Investments Ltd | Real estate | 2013 |
| Leyden's Autoparts Ltd | Wholesale & retail | 2003 |
| Lily Rose Boutique Ltd | Wholesale & retail | 2016 |
| LLD Property Ltd | Real estate | 2021 |
| LM Therapeutic Counselling Ltd | Health & social care | 2021 |
| Locale Home Sales & Lettings (Moira) Limited | Real estate | 2020 |
| Lokis (Hillsborough) Limited | Wholesale & retail | 2023 |
| Lorraine Mccourt Consulting Ltd | Professional & scientific | 2016 |
| Love Life Counselling N.I. C.I.C. | Health & social care | 2021 |
| Luxprize Limited | Wholesale & retail | 2020 |
| Lynn, Drake & Co. Limited | Professional & scientific | 2009 |
| Mark Mulholland Ltd | Professional & scientific | 2025 |
| Massey Investment Properties Ltd | Real estate | 2025 |
| Matec EVO UK Limited | Manufacturing | 2019 |
| Maughan Motors Belfast Ltd | Wholesale & retail | 2022 |
| Mccartney's of Moira Ltd | Wholesale & retail | 2012 |
| Mckee Engineering Solutions Ltd | Manufacturing | 2015 |
| Mckee Investments Ltd | Real estate | 2019 |
| MD Cleaning Ltd | Administrative & support | 2026 |
| Meraki Tattoo Belfast Ltd | Arts & recreation | 2026 |
| Mercian Works Ltd | Professional & scientific | 2025 |
| Michael Mckeown Investment Planning Limited | Financial services | 2011 |
| Mill Hill Property Ltd | Real estate | 2025 |
| Minthek Ltd. | Real estate | 2012 |
| MM Luxury Events Ltd | Administrative & support | 2026 |
| Moira Accountancy Services Ltd | Professional & scientific | 2014 |
| Moira Osteopathy Ltd | Health & social care | 2021 |
| Moira Players Community Theatre Group | Arts & recreation | 2019 |
| Moyallon Farm Limited | Extraterritorial | 2009 |
| Naical Holdings Ltd | Real estate | 2025 |
| New Orchard Farms Limited | Extraterritorial | 1944 |
| Newforte Foods Ltd | Hospitality | 2019 |
| NG Wealth Management Ltd | Financial services | 2026 |
| NI Bingo Association | Arts & recreation | 2024 |
| NI Car Trader Ltd | Wholesale & retail | 2024 |
| NI Creative Cottages Ltd | Construction | 2026 |
| NI Property Academy Ltd | Education | 2024 |
| NM Property Solutions Limited | Real estate | 2019 |
| North Coast Energy Solutions Ltd | Professional & scientific | 2025 |
| North South Management Consultants Limited | Professional & scientific | 2004 |
| Northern Baptist Corporation Limited | Other services | 1924 |
| Nutts Corner Sunday Market Limited | Real estate | 2010 |
| Ocean Rental Limited | Real estate | 2016 |
| One World Leadership C.I.C. | Education | 2018 |
| Orchardville Properties Limited | Real estate | 1984 |
| OWL & ASH Ltd | Real estate | 2025 |
| Parful Prints Ltd | Manufacturing | 2022 |
| PEN Property Holdings Ltd | Real estate | 2026 |
| Perigean Subsea Ltd | Professional & scientific | 2022 |
| PIE Moira Limited | Wholesale & retail | 2023 |
| Pizza Street Ltd | Hospitality | 2025 |
| PM Contracts Ltd | Construction | 2018 |
| Portland Fitout Limited | Construction | 2025 |
| Precision Plumbing N.I. Ltd | Construction | 2025 |
| Presho Developments Limited | Construction | 2017 |
| Prestige Group Property NI Ltd | Real estate | 2024 |
| Primary Property Development Limited | Real estate | 2024 |
| PRK Property Limited | Real estate | 2024 |
| Proteani Limited | Professional & scientific | 2016 |
| PT Renewables Ltd | Construction | 2024 |
| R & J Lyness Ltd | Manufacturing | 2003 |
| Rainbow Gym Club C.I.C. | Arts & recreation | 2016 |
| Randal Foods Limited | Hospitality | 2015 |
| Regal Investments (N.I.) Ltd | Real estate | 2017 |
| RHM Retail Ltd | Wholesale & retail | 2017 |
| Road and Sea Express (NI) Ltd | Transport & logistics | 2014 |
| Robert Bleakney Architects Limited | Professional & scientific | 2005 |
| Rocky Property Holdings Ltd | Financial services | 2025 |
| RS Haulage & Mechanical Ltd | Transport & logistics | 2019 |
| S.J. Anderson & Sons Ltd | Construction | 1988 |
| Sanr Property Ltd | Real estate | 2026 |
| Shivers Bathrooms Ltd | Wholesale & retail | 2015 |