| Newunolimavady Ltd | Hospitality | 2023 |
| Nigel Daly Consultancy Ltd | Education | 2022 |
| Nigel Jones Architects Limited | Professional & scientific | 2016 |
| Nipoultry Ltd | Administrative & support | 2010 |
| NO. 4 Victoria Ltd | Wholesale & retail | 2018 |
| Noahsraven Limited | Arts & recreation | 2025 |
| North Coast Glamping Ltd | Hospitality | 2021 |
| North Coast Ireland Golf Tours Ltd | Administrative & support | 2022 |
| North Tech Limited | Wholesale & retail | 2023 |
| North West Care and Support Limited | Health & social care | 1993 |
| North West Childcare Services Ltd | Health & social care | 2025 |
| North West Dent Repair Ltd | Wholesale & retail | 2018 |
| North West Electrical Compliance Ltd | Construction | 2021 |
| North West Lifelong Learning Ltd | Education | 2010 |
| North West Machinery Ltd | Administrative & support | 2019 |
| Northern Ceramics (Limavady) Limited | Construction | 2004 |
| Northland Road Management Company Ltd | Households | 2004 |
| NU Chic Ltd | Wholesale & retail | 2026 |
| NW Security NI Limited | Administrative & support | 2017 |
| NWB Construction Limited | Construction | 2022 |
| NWJ Joinery Ltd | Construction | 2015 |
| O'Briens 2025 Ltd | Manufacturing | 2025 |
| O'Connor's Scaffolding Ltd | Construction | 2017 |
| O'Hara Car Sales Ltd | Wholesale & retail | 2016 |
| O'Hara D Limited | Wholesale & retail | 2023 |
| O'Hara Farms Ltd | Agriculture & fishing | 2023 |
| O'Kane & Devine Construction Limited | Construction | 1989 |
| O'Kane Ceilings Limited | Construction | 2015 |
| O'Kane Group Limited | Construction | 2015 |
| O'Kane Holdings (N.I) Limited | Construction | 2016 |
| O'Kane Road Markings Ltd | Construction | 2023 |
| Oak Country Manor (Management) Ltd | Households | 2016 |
| Oak Tree Manor Management Company Limited | Households | 2010 |
| Oake Enterprises Ltd | Financial services | 2025 |
| Oake Estates Limited | Real estate | 2025 |
| OH Papi Ltd | Hospitality | 2023 |
| Old Castle Management Company Limited - the | Households | 1999 |
| Old Distillery Gardens Management Company Ltd | Households | 2021 |
| Old School Field Management Services Ltd -the | Households | 2001 |
| Oldbridge Management Company Limited | Households | 2004 |
| Oldstone Manor Management Ltd | Real estate | 2007 |
| Omagh Developments Ltd | Construction | 2005 |
| Omra Coffee Limited | Manufacturing | 2022 |
| Opus Power Networks Limited | Construction | 2023 |
| Oscar Harper Motors Ltd | Wholesale & retail | 2022 |
| Oville Asset Management Ltd | Construction | 2015 |
| Owcc Ltd | Professional & scientific | 2015 |
| P & L Electrics (M&E) Limited | Construction | 2006 |
| P T Investments (NI) Limited | Hospitality | 2012 |
| Paddock Lane Management Limited | Households | 2017 |
| Paragon Campsie Ltd | Manufacturing | 2020 |
| Parkline Enterprises Limited | Real estate | 1999 |
| Paul Barrett Contracts Ltd | Construction | 2017 |
| PAX Consultancy Ltd | Public administration | 2021 |
| Pennethorn Court (Phase 2) Management Company Limited | Households | 2000 |
| Pennethorn Court Management Company Limited | Households | 2000 |
| Petrie Enterprises Limited | Administrative & support | 2004 |
| PFS & Partners Limited | Professional & scientific | 2002 |
| Philiam Properties Ltd | Real estate | 2020 |
| PL & KM Enterprises Ltd | Manufacturing | 2019 |
| Plantation Management (Limavady) Ltd | Households | 2005 |
| PMC Joinery Ltd | Construction | 2025 |
| PNP Solutions Ltd | Information & communication | 2020 |
| POK Enterprises Ltd | Construction | 2015 |
| Porterhouse Property Ltd | Real estate | 2023 |
| Portrush Road Management Company Limited | Households | 2019 |
| Powerturn Buggies Ltd | Manufacturing | 2024 |
| Precise Access Ltd | Administrative & support | 2017 |
| Precision Ceilings Limited | Construction | 2014 |
| Prestige Autos (N.I) Ltd | Wholesale & retail | 2021 |
| Probix Ltd | Administrative & support | 1997 |
| Purcell Farms | Agriculture & fishing | 2025 |
| Queen Street Management Company Ballymoney Ltd | Households | 2023 |
| Queensway Park Management Company Limited | Households | 2015 |
| Quinn Construction and Drylining Ltd | Construction | 2015 |
| Quinn Partitions Ltd | Construction | 2023 |
| R & P DRY Lining Limited | Construction | 2017 |
| R G Connell & SON Solicitors Limited | Professional & scientific | 2012 |
| Railway House Limited | Construction | 2017 |
| Ramcon Ltd | Construction | 2023 |
| Ramparts Antiques Ltd | Wholesale & retail | 2020 |
| Rannakeeran Management Company Ltd | Households | 2016 |
| Rasharkin Green Management Limited | Extraterritorial | 2005 |
| Rathúnas Consultancy Ltd | Information & communication | 2022 |
| RAW Inns Ltd | Other services | 2016 |
| Rayhil Caravan Park Ltd | Hospitality | 2020 |
| REC Consulting Limited | Professional & scientific | 2006 |
| Red Oak Joinery Contracts Ltd | Construction | 2019 |
| Redwood Property (Belfast) Ltd | Real estate | 2017 |
| Regency House Asset Management Ltd | Professional & scientific | 2017 |
| Ritters Court Management Company Limited | Households | 2004 |
| Riverdale (Mosside) Management Ltd | Households | 2017 |
| Riverside Property Developments Limited | Real estate | 2007 |
| Riverside Site Joinery Ltd | Construction | 2016 |
| Riverview Management Company (Ballykelly) Limited | Households | 2004 |
| Riverview Manor Management Company Ltd | Households | 2019 |
| RJ Martin Limited | Construction | 2026 |
| RL Partitions Ltd | Construction | 2025 |
| RM Roofing Maintenance Ltd | Construction | 2012 |
| RMW Capital Ltd | Financial services | 2025 |