| Millrush Mews Management Co. Ltd | Extraterritorial | 2002 |
| Millstone Court Ltd | Extraterritorial | 2000 |
| Millstone Land Management Ltd | Extraterritorial | 2001 |
| Montagu Court Services Ltd | Extraterritorial | 2003 |
| Montagu Property Management Limited | Real estate | 2018 |
| More Retail Limited | Wholesale & retail | 2014 |
| Morelli's Plaza Management Company Limited | Extraterritorial | 2001 |
| Moss Property Services Limited | Construction | 2005 |
| Mount Falcon Estates Limited | Construction | 2018 |
| Mount Pleasant Residents Management Company Ltd | Households | 2022 |
| Mountsandel Manor Management Limited | Extraterritorial | 2003 |
| Multiglaze Systems Limited | Manufacturing | 2015 |
| NO13 Construction Ltd | Construction | 2020 |
| North Coast Catering Limited | Hospitality | 2014 |
| North Coast Cocktails Ltd | Hospitality | 2020 |
| North Coast Hearing Limited | Health & social care | 2024 |
| North Coast Media Ltd | Information & communication | 2021 |
| North Coast Property Management Ltd | Real estate | 2004 |
| North Coast Summer School Ltd | Health & social care | 2026 |
| Nuala Lissadell Limited | Real estate | 2020 |
| O'Hara Court Services Ltd | Extraterritorial | 2000 |
| O'Neill's Caravan Sales & Distributors Limited | Construction | 1976 |
| Ocean Court Management Company Limited | Extraterritorial | 2003 |
| Ocean Drive Portstewart Management Limited | Professional & scientific | 2010 |
| Ocean View (Castlerock) Management Limited | Households | 2003 |
| Ocean View Portstewart Management Company Limited | Real estate | 2016 |
| Old Model Court Services Limited | Extraterritorial | 1993 |
| Onboard Staffing Solutions Ltd. | Other services | 2013 |
| P C Builders (N.I.) Ltd | Construction | 2017 |
| Peace Love Ice-Cream Morelli's Ltd | Wholesale & retail | 2009 |
| PFD (NI) Ltd | Health & social care | 2013 |
| Philip Flynn Consulting Limited | Professional & scientific | 2011 |
| Port Diana Management Company Limited | Households | 2017 |
| Port Portfolio Ltd | Hospitality | 2024 |
| Portmore Cove Management Services Limited | Extraterritorial | 2004 |
| Portmore Rocks Management Company Limited | Households | 2023 |
| Portstewart Catering Ltd | Hospitality | 2013 |
| Portstewart Electrical Ltd | Wholesale & retail | 2023 |
| Portstewart Football & Community Club Limited | Hospitality | 1994 |
| Portstewart Motorcycle and ATV Recycling Ltd | Water & waste | 2013 |
| Prospect Medical (NI) Limited | Health & social care | 2014 |
| Queensgate Ballymoney Limited | Households | 2022 |
| Ramore Avenue Management Limited | Extraterritorial | 2006 |
| Rapid Retail Delivery Services Ltd | Wholesale & retail | 2024 |
| Rathlin Asset Management Limited | Financial services | 2026 |
| Rathmore Court Portrush Management Limited | Extraterritorial | 1991 |
| Read Write Company Limited - the | Information & communication | 1998 |
| Rectory Green Broughshane Management Ltd | Households | 2015 |
| Revabbey Limited | Real estate | 2025 |
| Revival Ministries Ltd | Other services | 2026 |
| Riverdale Lodge Services Limited | Extraterritorial | 1998 |
| Road Pilot Ireland Ltd | Transport & logistics | 2025 |
| Rockhaven Management Limited | Extraterritorial | 1999 |
| Rockview Point Ltd | Construction | 2017 |
| ROO Property Limited | Real estate | 2016 |
| Roof Needs Ltd | Construction | 2023 |
| Roots&Rhythm Entertainment NI Ltd | Arts & recreation | 2025 |
| Rosselinn Management Company Ltd | Households | 2022 |
| RS Shopping Ltd | Wholesale & retail | 2019 |
| Rusky Park Management Company Limited | Extraterritorial | 2013 |
| Sandel Village Centre Management Company Limited | Households | 2019 |
| Scullion Footwear Limited | Wholesale & retail | 2023 |
| Sea Splash Court Management Limited | Extraterritorial | 2002 |
| Seacoast Management Company Limited | Households | 2016 |
| Seahaven Homes Management Limited | Extraterritorial | 1988 |
| Seamara Management Company Limited | Households | 2020 |
| Seaport Management Limited | Extraterritorial | 1997 |
| Sebastian & Co Ltd | Hospitality | 2023 |
| Sika Gymnastics CIC | Arts & recreation | 2020 |
| Sirius Tech Solutions Ltd | Information & communication | 2018 |
| Sketrick Investments Limited | Real estate | 2017 |
| Smooi Medical Services Ltd | Health & social care | 2022 |
| Somerset Park Management Limited | Households | 2017 |
| Sorriso Coleraine Ltd | Hospitality | 2019 |
| Springmount Mews Apartment Management Company Limited | Extraterritorial | 2009 |
| Springmount Mews Estate Management Company Limited | Extraterritorial | 2009 |
| Station Park Management Number 2 Limited | Households | 2017 |
| Station Park Portstewart Management Ltd | Households | 2014 |
| Stepping Stones Creche Limited | Education | 1974 |
| Stewartbrown Ltd | Hospitality | 2018 |
| Stone Fast Property Ltd | Real estate | 2025 |
| Strand Mews Management Limited | Extraterritorial | 1994 |
| Strandmore Lane Limited | Real estate | 2022 |
| Superfry Northcoast Ltd | Hospitality | 2015 |
| Swing Shed Ltd | Arts & recreation | 2025 |
| Synapsix Limited | Wholesale & retail | 2026 |
| TAJ Bites Limited | Hospitality | 2025 |
| Tanya Mcminn Ltd | Professional & scientific | 2023 |
| Taylor Court Services Ltd | Extraterritorial | 2001 |
| Tech Iland Ltd | Wholesale & retail | 2025 |
| THE Apeiron Method CIC | Health & social care | 2026 |
| THE EBB Portstewart Management Company Limited | Households | 2016 |
| THE Hummingbird Project C.I.C. | Other services | 2016 |
| THE Port Apartment Limited | Extraterritorial | 2015 |
| Torney Bros. Holdings | Professional & scientific | 1980 |
| Trinity White Technologies Limited | Information & communication | 2016 |
| Tullaghmurray Hill Management Company Limited | Extraterritorial | 2013 |
| Tullymore Management Services Limited | Extraterritorial | 2000 |
| Turbitts Management Company Limited | Households | 2019 |
| Turkish Kabab Ltd | Hospitality | 2026 |