| Northern Bespoke Ltd | Construction | 2022 |
| Northern EPA Ltd | Education | 2018 |
| Northern Exports Limited | Construction | 2017 |
| Northern Industrial Cleaning Equipment Ltd | Manufacturing | 2022 |
| Northern Lymphology Ltd | Health & social care | 2009 |
| Northern Planning Company Ltd | Professional & scientific | 2026 |
| Northern Sky Education Ltd | Education | 2022 |
| Northern Solar Solutions Limited | Construction | 2025 |
| Northern Sports Cars Ltd | Wholesale & retail | 2019 |
| Northgold Property Ltd | Real estate | 2025 |
| Northways SPV One Ltd | Financial services | 2021 |
| Northwest Door Security Ltd | Other services | 2012 |
| Norwest Finance Group Ltd | Financial services | 2021 |
| Norwest Financial Services Limited | Financial services | 2017 |
| Novacoast Limited | Administrative & support | 2016 |
| Nsbdc Limited | Health & social care | 2022 |
| Nuccon Ltd | Construction | 2022 |
| Nuclear Containment and Ventilation (UK) Ltd | Professional & scientific | 2012 |
| Number Nine Properties Limited | Real estate | 2015 |
| Nuno Transport Ltd | Transport & logistics | 2019 |
| Nurse AMY Skin Clinic Ltd | Health & social care | 2024 |
| Nuttall & Wright Holdings Limited | Real estate | 2025 |
| Nuttall & Wright Investments Limited | Financial services | 2025 |
| NW Business Services Limited | Professional & scientific | 2008 |
| O'Callaghan Limited | Construction | 2005 |
| Oak Leigh Sales and Lettings Ltd | Real estate | 2019 |
| Oakfield Fabrication & Construction Ltd | Construction | 2023 |
| Oakmount Mill Ltd | Real estate | 2017 |
| OBE Property Limited | Real estate | 2017 |
| OC Civils Ltd | Construction | 2026 |
| OC FM Ltd | Professional & scientific | 2026 |
| OC Innovations Europe Ltd | Energy | 2020 |
| Official KIT Ltd | Administrative & support | 2006 |
| OG Property Development Group Limited | Real estate | 2026 |
| Ohka Ltd | Other services | 2025 |
| Old School House Properties Ltd | Real estate | 2022 |
| Onehawk Solutions Ltd | Information & communication | 2024 |
| Opti-Therm Ltd | Manufacturing | 2026 |
| Opulenta AI Limited | Professional & scientific | 2007 |
| Opus Design Services Limited | Administrative & support | 2017 |
| Orbits Wellbeing Limited | Health & social care | 2023 |
| Orellawood Property Investments Limited | Construction | 1983 |
| Organised Chaos (Lancashire) Ltd | Arts & recreation | 2010 |
| Orwin Consultancy Ltd | Professional & scientific | 2018 |
| Orwins LLP | | 2019 |
| Orwins LLP (Holdings) Limited | Professional & scientific | 2019 |
| Otter House Retail Solutions Ltd | Wholesale & retail | 2025 |
| Outdoor Sorted Ltd | Administrative & support | 2026 |
| Outdoors 4 ALL Ltd | Education | 2017 |
| Outsourced Resource Services Ltd | Administrative & support | 2024 |
| Over Peover Limited | Real estate | 2025 |
| P & a Takeaways Ltd | Hospitality | 2017 |
| P & C Marsden Developments Ltd | Construction | 2021 |
| P H Sealants Limited | Construction | 2010 |
| P Harrison Lubricants Limited | Wholesale & retail | 2018 |
| P&Cl Rhodes Ltd | Professional & scientific | 2025 |
| P&I Holdings Ltd | Real estate | 2025 |
| P&L Howarth Holdings Ltd | Financial services | 2025 |
| P&V Business Consultants Ltd | Professional & scientific | 2018 |
| P. Harrison & Co. (Holdings) Limited | Financial services | 2017 |
| P. Harrison & Co. Limited | Wholesale & retail | 1993 |
| P. Wadsworth Limited | Hospitality | 2025 |
| P.A. Brickwork Ltd | Construction | 2018 |
| Padiwacks.Co.Uk Ltd | Health & social care | 2007 |
| Pakman Health Limited | Health & social care | 2019 |
| Pales Advisory Ltd | Professional & scientific | 2025 |
| Pamco(Nw) Ltd | Real estate | 2017 |
| Panash (UK) Limited | Wholesale & retail | 2009 |
| Paragon Alliance Ltd | Financial services | 2024 |
| Parcels R US Ltd | Transport & logistics | 2026 |
| Park Bond Investments Ltd | Real estate | 2023 |
| Parkland Machines Limited | Wholesale & retail | 1986 |
| Pateshall Plant Limited | Extraterritorial | 1967 |
| Patil Management Group Ltd | Professional & scientific | 2026 |
| Paul Garlington Battlefield Historian Limited | Administrative & support | 2014 |
| Paul Howarth (NW) Limited | Professional & scientific | 2025 |
| PB & ME CIC | Education | 2025 |
| Pdhydraulics Ltd | Other services | 2018 |
| Pdkn Ltd | Administrative & support | 2024 |
| Pearce Home Improvements Ltd | Construction | 2020 |
| Pemberton Building Supplies Limited | Wholesale & retail | 1985 |
| Pendle Antiques Limited | Wholesale & retail | 1993 |
| Pendle Dance Events Ltd | Arts & recreation | 2026 |
| Pendle Electrical Services Limited | Extraterritorial | 2022 |
| Pendle Holdings Limited | Administrative & support | 2016 |
| Pendle Ortho Plus Ltd | Health & social care | 2008 |
| Pendle Transformation Ltd | Information & communication | 2026 |
| Pendle View Holiday Lodges Limited | Real estate | 2022 |
| Pendlepace Ltd | Professional & scientific | 2001 |
| Pendleside Doctors Limited | Health & social care | 2019 |
| Pendleside Medical Practice Limited | Professional & scientific | 2014 |
| Pennine Harvest Limited | Extraterritorial | 2007 |
| Penpod Overland Ltd | Manufacturing | 2004 |
| Pepe KLC Ltd | Hospitality | 2026 |
| Perceptions Holdings Limited | Professional & scientific | 2018 |
| Percy Wright & SON Limited | Construction | 1964 |
| Petre Garden Maintenance Ltd | Professional & scientific | 2014 |
| PH Print & Design Ltd | Manufacturing | 2015 |
| Phil Badley Consulting Limited | Professional & scientific | 2011 |
| Philip David Ltd | Health & social care | 2015 |