| Oley Meadows Management Limited | Households | 1994 |
| Ollycomm Ltd. | Information & communication | 2013 |
| Olympus Gyms North East Limited | Arts & recreation | 2014 |
| Omega Pets Ltd | Wholesale & retail | 2023 |
| Omifun Ltd | Wholesale & retail | 2025 |
| OMNICART247 Ltd | Wholesale & retail | 2025 |
| ON & Gone Recovery Ltd | Wholesale & retail | 2025 |
| ON & Gone Vehicle Transport Ltd | Wholesale & retail | 2025 |
| One Family Property Limited | Real estate | 2024 |
| Onee Group Developments Ltd | Construction | 2020 |
| Onefour Digital NE Limited | Professional & scientific | 2023 |
| Online Integrations Limited | Other services | 2021 |
| Onyx Metal and Timber Limited | Construction | 2025 |
| Opal Orion Ltd | Real estate | 2026 |
| Optimum Strategic Holdings Ltd | Financial services | 2025 |
| Orangutan Landscapes & Tree Services Ltd | Agriculture & fishing | 2023 |
| Organic Specialities Limited | Manufacturing | 1995 |
| Original Wave Ltd. | Professional & scientific | 2017 |
| Orion Product Development Ltd | Professional & scientific | 2007 |
| Orsynetics Limited | Manufacturing | 1977 |
| Othala Pods Limited | Manufacturing | 2023 |
| Otolift Manufacturing Limited | Manufacturing | 2018 |
| Otolift Stairlifts Limited | Wholesale & retail | 2011 |
| OUR Relations Ltd | Information & communication | 2023 |
| Ouston Holdings Ltd | Real estate | 2024 |
| Outlet Properties Limited | Real estate | 1999 |
| Owen Ryan Consulting and Coaching Ltd | Professional & scientific | 2018 |
| P Harding Limited | Financial services | 2017 |
| P&L Barnett Properties Limited | Real estate | 2025 |
| P. Robinson Groundworks Ltd | Construction | 2015 |
| P.W. Plumbing & Heating Services Limited | Construction | 2005 |
| P700TTR Limited | Construction | 2025 |
| Paddlethelakes Ltd | Wholesale & retail | 2025 |
| Paddy's PAW Patrol Limited | Transport & logistics | 2025 |
| Panda Bandits Ltd | Arts & recreation | 2022 |
| Par-Tee Pint Ltd | Wholesale & retail | 2025 |
| Paradigm Law Limited | Professional & scientific | 2022 |
| Parallel Photonic Systems Limited | Professional & scientific | 1995 |
| Paramount Safety Management Ltd | Professional & scientific | 2009 |
| Parkyns Services Ltd | Extraterritorial | 2016 |
| Paul and Loughran Limited | Manufacturing | 1978 |
| Paul Smith & Company, Limited | Hospitality | 2019 |
| Paul Stokes Electricals Limited | Construction | 2016 |
| PDT Engineering Services Limited | Construction | 2025 |
| Peak Ridge Ltd | Information & communication | 2019 |
| Pegasus Fightwear Limited | Wholesale & retail | 2026 |
| Peile Court Residents Limited | Real estate | 2008 |
| Peile Park Management Company Limited | Households | 2024 |
| Peking Villa Limited | Hospitality | 2016 |
| Penrose Pointing Limited | Construction | 2023 |
| Pentagon Inspection Ltd | Professional & scientific | 2021 |
| Perkins 4 Solutions Ltd | Manufacturing | 2020 |
| Personal Moments Ltd | Wholesale & retail | 2018 |
| Peter Elliott Joinery Ltd | Construction | 2025 |
| Peter Topping Consulting Ltd | Professional & scientific | 2016 |
| Phil Brown Creative Ltd | Professional & scientific | 2021 |
| Philip J Archer (Consultancy) Limited | Real estate | 2010 |
| Phillip Bull Plumbing Services Ltd | Construction | 2025 |
| Phillips Distribution Limited | Manufacturing | 2025 |
| Phoenix (Consett) Limited | Other services | 2017 |
| Phoenix Property & Estates Ltd | Real estate | 2023 |
| PI + + Limited | Information & communication | 1999 |
| Pianeer Services Ltd | Administrative & support | 2016 |
| Piggy Blinders NE Ltd | Hospitality | 2024 |
| Pink Whiskers Ltd | Other services | 2020 |
| Pinky Properties NE Ltd | Real estate | 2024 |
| Pinnacle Re-Tec Limited | Manufacturing | 2006 |
| Pinspection NDT Limited | Professional & scientific | 2017 |
| Pita Paradise to Kati Allo Ltd | Hospitality | 2024 |
| Pixel Apocalypse Ltd | Information & communication | 2023 |
| Pizza Consett Ltd | Hospitality | 2026 |
| Pizza Time Consett Limited | Hospitality | 2023 |
| PJT Solutions NE Limited | Administrative & support | 2024 |
| PK Kitchens Limited | Manufacturing | 2013 |
| Planexa Limited | Professional & scientific | 2026 |
| Plectrum AI Ltd | Information & communication | 2026 |
| Plumbpro Ltd | Construction | 2023 |
| PMJ Property Limited | Construction | 2022 |
| PMO Expertise Limited | Professional & scientific | 2014 |
| Point North (East) Ltd | Construction | 2015 |
| Pokebricksbops Ltd | Wholesale & retail | 2026 |
| Polaris Consulting Services Ltd | Professional & scientific | 2025 |
| Polaris Electrical Solutions Ltd | Construction | 2025 |
| POLE2POLESURVEYS Ltd | Construction | 2026 |
| Polskisupplies Ltd | Wholesale & retail | 2026 |
| Polybac Environmental Services Limited | Professional & scientific | 2016 |
| Poosie Limited | Other services | 2023 |
| Poppydps Limited | Construction | 2026 |
| POT Trading Ltd | Financial services | 2017 |
| Potts Property Developers Ltd | Real estate | 2025 |
| Powell Access and Coatings Ltd | Construction | 2019 |
| Precision Building N.E Ltd | Construction | 2014 |
| Precision Lift Repairs Ltd | Manufacturing | 2025 |
| Precision Property N.E Ltd | Households | 2023 |
| Premier Global Ltd | Wholesale & retail | 2025 |
| Pressed Express Northeast Ltd | Other services | 2021 |
| Prestige Limousine Hire NE Ltd | Transport & logistics | 2024 |
| Prestige Roofing & Building (N.E.) Ltd | Construction | 2013 |
| Prime Short Stays Ltd | Households | 2026 |
| Principle Plumbing Ltd | Construction | 2026 |