| Pethgate Residents Limited | Households | 1986 |
| Petini & Co Limited | Hospitality | 2021 |
| Petit Vert Ltd | Wholesale & retail | 2024 |
| Pharma Plus Medical Ltd | Wholesale & retail | 2010 |
| Pharmaeng Ltd | Professional & scientific | 2025 |
| Phase III the Watermark Management Company Limited | Real estate | 2005 |
| Phase IV the Watermark Management Company Limited | Real estate | 2005 |
| Phase Photonics Ltd | Manufacturing | 2018 |
| PHB (Cotswolds) Ltd | Hospitality | 2022 |
| Phelan & Vincent Properties Ltd | Real estate | 2023 |
| Phelan Legal Limited | Professional & scientific | 2018 |
| Phillip Hardy (Plumbing & Heating) Co. Limited | Construction | 1983 |
| PHL Consulting Limited | Professional & scientific | 2020 |
| Phoenix Developments (Morpeth) Limited | Hospitality | 2000 |
| Phrase Creative Ltd | Professional & scientific | 2020 |
| Pigdon Grange Management Company Limited | Real estate | 2008 |
| Pilatease Morpeth Ltd | Education | 2025 |
| Pilling Financial Ltd. | Financial services | 2006 |
| Pinky's Nail Boutique Ltd | Other services | 2010 |
| Pinnacle Safety HSE Consultancy Ltd | Real estate | 2020 |
| Pioneer Trees and Landscapes Limited | Administrative & support | 2018 |
| PIP Heywood Ltd | Information & communication | 2026 |
| Pipeflex Limited | Manufacturing | 1997 |
| Piramal Healthcare Pension Trustees Limited | Administrative & support | 2005 |
| Piramal Healthcare UK Limited | Administrative & support | 2005 |
| Pixel Native Media Ltd | Professional & scientific | 2025 |
| Pizcor Morpeth Ltd | Hospitality | 2022 |
| Pizzacor Ltd | Hospitality | 2026 |
| PJD Electrical Solutions NE Ltd | Construction | 2018 |
| PJH Automation Ltd | Professional & scientific | 2026 |
| Pjhj Services Limited | Administrative & support | 2009 |
| PKA Locksmiths Ltd | Other services | 2023 |
| Planmyservice Limited Liability Partnership | | 2012 |
| Plant Training North East Ltd | Construction | 2019 |
| Plough Inn (Mitford) Limited | Hospitality | 2018 |
| Plsc Hospitality Ltd | Hospitality | 2024 |
| Plumbing Heating & Handyman Services Ltd | Construction | 2022 |
| Plumpkat Ltd. | Professional & scientific | 2021 |
| PM Commercial Property Consultants Limited | Real estate | 2007 |
| PMC Accountancy (NE) Limited | Professional & scientific | 2023 |
| Pocket Projects Ltd | Information & communication | 2022 |
| Pogo Touring Ltd | Arts & recreation | 2020 |
| Polmc Accountants Ltd | Professional & scientific | 2011 |
| Portalway LLP | | 2007 |
| Positive Electrical Solutions NE Ltd | Construction | 2025 |
| Power Electrical NE Ltd | Construction | 2022 |
| PR Willow Ltd | Extraterritorial | 2011 |
| Pre-School and After School at Whalton School Limited | Education | 1999 |
| Precision Site Engineering Ltd | Construction | 2021 |
| Press Electrical Solutions Limited | Construction | 2013 |
| Pressed Club Ltd | Hospitality | 2025 |
| Price Management Services NE Ltd | Professional & scientific | 2024 |
| Price Mccormick Limited | Real estate | 2022 |
| Prices Engineering Ltd | Professional & scientific | 2023 |
| Primary Games Limited | Information & communication | 2002 |
| Primount Properties Limited | Real estate | 2001 |
| Pro Sell BD Ltd | Professional & scientific | 2025 |
| Pro-Ad Limited | Professional & scientific | 1982 |
| Process Driven Fitness Ltd. | Arts & recreation | 2019 |
| Professional Auto Solutions Ltd | Wholesale & retail | 2011 |
| Projeeco Limited | Professional & scientific | 2014 |
| Promise Development Limited | Professional & scientific | 2004 |
| Property Investors North East LLP | | 2024 |
| Prudhoe YC Seniors Limited | Arts & recreation | 2026 |
| PSR Logistics Group Ltd | Transport & logistics | 2026 |
| PSS (NE) Ltd | Real estate | 2025 |
| Puffin Petals Ltd | Wholesale & retail | 2026 |
| Pumpkin PIE Childcare Ltd | Health & social care | 2016 |
| QR Living Memories Limited | Information & communication | 2023 |
| Quadtech Limited | Manufacturing | 2002 |
| Quality Associates Limited | Professional & scientific | 1998 |
| Quantum Alignment - Bioresonance Healing Limited | Health & social care | 2025 |
| Quantum Quill Ltd | Wholesale & retail | 2026 |
| Questuav Ltd | Wholesale & retail | 2011 |
| R & D M Edmondson Ltd | Wholesale & retail | 2012 |
| R & H Developments Group Limited | Construction | 2026 |
| R & J Oglesby Limited | Agriculture & fishing | 2026 |
| R & L Automotive Limited | Wholesale & retail | 2012 |
| R & T (NE) Ltd | Hospitality | 2016 |
| R a Mallaburn Builders (Alnwick) Limited | Construction | 2012 |
| R a W Clark LLP | | 2019 |
| R Mulholland Roofing & Cladding Limited | Construction | 2013 |
| R Wilson Fencing Limited | Construction | 2025 |
| R. Hutton Agriculture Ltd. | Wholesale & retail | 2011 |
| R2 Production Services Ltd | Arts & recreation | 2023 |
| RA Bulloch Services Limited | Construction | 2025 |
| Rachea Ltd | Health & social care | 2018 |
| Rachel Martin Legal Services Limited | Professional & scientific | 2017 |
| Raffy Residential Ltd | Real estate | 2024 |
| Raggy Dolls Limited | Wholesale & retail | 2007 |
| Rail Operator Guides Ltd | Information & communication | 2024 |
| Raise the Rafters Housing Ltd | Real estate | 2023 |
| Rama Care Ltd | Health & social care | 2018 |
| Rapid Reaction Medical Ltd | Health & social care | 2019 |
| Rasp Jewellery Ltd | Manufacturing | 2012 |
| Raven Language Solutions Ltd | Education | 2024 |
| Rayda Legal Limited | Professional & scientific | 2024 |
| Raymond Jones & Co. Ltd | Financial services | 2008 |
| RC Advisors Ltd | Administrative & support | 2026 |
| RC Energy Ltd | Professional & scientific | 2024 |