| J.A.B. Enterprises Limited | Agriculture & fishing | 1914 |
| Jackman & PIE LLP | | 2018 |
| JAM JAR Coffee House Ltd | Hospitality | 2016 |
| Java Holdings Number 1 Limited | Real estate | 2017 |
| Jingles Gift Shop Ltd | Wholesale & retail | 2023 |
| Jlove Construction Ltd | Construction | 2019 |
| Junction One Limited | Construction | 2002 |
| K.Mckenna Limited | Administrative & support | 2012 |
| Kaleido Clothing Limited | Manufacturing | 2017 |
| Karlitos Ltd | Hospitality | 2013 |
| KCL Property Management Limited | Real estate | 2014 |
| KCM Wealth Management Ltd | Financial services | 2012 |
| Kennedy Group Holdings Limited | Real estate | 1998 |
| Kennedy Group Properties Ltd | Construction | 1997 |
| Kennedy Hotels (NI) Limited | Hospitality | 1997 |
| Kennedy Investments Limited | Real estate | 1976 |
| Kenry Developments Limited | Administrative & support | 2002 |
| Kentos Developments Limited | Construction | 1976 |
| Killeague Limited | Real estate | 2017 |
| Kilrea Gallery Ltd | Wholesale & retail | 2014 |
| Knocklyn Management Co Ltd | Households | 2007 |
| Knocklyn Properties Limited | Construction | 2005 |
| Koko Street Food Ltd | Hospitality | 2025 |
| Lamex Holding Group Limited | Wholesale & retail | 2025 |
| Landmark Luxury Ltd | Administrative & support | 2024 |
| Landsdowne Holdings Limited | Real estate | 2020 |
| Laneway Developments Ltd | Real estate | 2008 |
| Lansdowne Crescent Management Company (N.I.) Limited | Households | 2015 |
| Linen Shore Ltd | Wholesale & retail | 2025 |
| Lodge Road Construction Limited | Real estate | 2014 |
| Longsit Limited | Professional & scientific | 2026 |
| Lush & Legacy Promotions Ltd | Arts & recreation | 2018 |
| MC1RGYM Ltd | Arts & recreation | 2026 |
| Mcgarry Motors Ltd | Wholesale & retail | 2016 |
| Mcshane Glen Management Company Ltd | Households | 2026 |
| MF Rowan Tree Ltd | Financial services | 2023 |
| Mill Strand Integrated School Limited | Education | 1987 |
| Millgrange Transport Limited | Extraterritorial | 2015 |
| Mjsdiagnostics Ltd | Real estate | 2026 |
| Morellis Ballycastle Ltd | Manufacturing | 2015 |
| Morellis Cookstown Ltd | Manufacturing | 2015 |
| Mountsandel Apartments Limited | Real estate | 2020 |
| Mousey Enterprises (NI) Limited | Real estate | 2023 |
| Moylena Limited | Financial services | 2014 |
| Nexus (North Coast) Ltd | Professional & scientific | 2024 |
| NO 71 Eglinton Street Management Company Limited | Extraterritorial | 2016 |
| North Coast Foods Ltd | Hospitality | 2025 |
| North Coast Leisure Limited | Wholesale & retail | 2011 |
| North Coast Life Solutions Ltd | Financial services | 2026 |
| North Coast Worldchoice Ltd | Administrative & support | 2017 |
| Ocean Deli Ltd. | Wholesale & retail | 2022 |
| Old Church Court Management Company Limited | Extraterritorial | 2002 |
| Orianna Investments Ltd | Real estate | 2003 |
| Owey Enterprises Limited | Wholesale & retail | 1986 |
| Paracin Limited | Construction | 1995 |
| Paul Simon Catering Limited | Hospitality | 2023 |
| Pcas Properties Ltd | Real estate | 2016 |
| Peninsula Management Company Ltd | Households | 2006 |
| People of Earth Ltd | Wholesale & retail | 2019 |
| Phoenix Works Management Services Ltd | Extraterritorial | 2006 |
| Portrush Community Enterprises Limited | Real estate | 1998 |
| Portrush Heritage Group | Education | 2021 |
| Portrush Lofts Limited | Real estate | 2011 |
| Portrush Pentecostal Church Limited | Other services | 2023 |
| Portrush Souvenirs Ltd | Wholesale & retail | 2021 |
| Portrush Transport Limited | Transport & logistics | 2015 |
| Premiersportsgenetics Ltd | Professional & scientific | 2026 |
| Principia - Fire & Ice Ltd. | Health & social care | 2025 |
| Quintessential Electrical Engineering Services Ltd | Professional & scientific | 2020 |
| RAS Hospitality Limited | Hospitality | 2022 |
| RCM Coffee Ltd | Hospitality | 2026 |
| Rinfield Management Limited | Households | 2003 |
| Rkjv Limited | Construction | 2006 |
| Rochester Apartments Portrush Limited | Households | 2015 |
| Rothesay Properties Ltd | Real estate | 2025 |
| Rubane Investments Limited | Hospitality | 1987 |
| SBR Tech Ltd | Wholesale & retail | 2023 |
| Science for Skin Ltd. | Manufacturing | 2015 |
| Sea View Management Company (Portrush) Ltd | Households | 2025 |
| Seabank Private Care Limited | Health & social care | 2020 |
| Selah Developments Limited | Real estate | 2016 |
| Skateboard:Ni C.I.C. | Arts & recreation | 2015 |
| SMT Presenting Limited | Professional & scientific | 2026 |
| Sole and Space Ltd | Real estate | 2025 |
| Somerset Mews Management Limited | Extraterritorial | 1994 |
| Sonrisa Solutions Limited | Professional & scientific | 2011 |
| Sscc Homes Ltd | Hospitality | 2020 |
| Sureclean Systems Ltd | Wholesale & retail | 2020 |
| T. Boyd (Investments) Limited | Wholesale & retail | 1987 |
| TEE Time Foods Ltd | Hospitality | 2026 |
| Texel Investments Limited | Real estate | 1995 |
| THE Arcadia Beach Cafe Ltd | Hospitality | 2014 |
| THE Diner & Burger Joint Ltd | Wholesale & retail | 2023 |
| THE Glebe Public Houses Ltd | Hospitality | 2013 |
| THE Tides Portrush Ltd | Hospitality | 2013 |
| THE VUE Management Company Limited | Real estate | 2017 |
| THE Watch House Apartments Management Company Limited | Households | 2022 |
| Tilomar Limited | Real estate | 1990 |
| Tlsn Limited | Professional & scientific | 2025 |
| Toner Property Investments Ltd | Real estate | 2024 |