| Northern Rights Social Enterprise (Tyne and Wear) Limited | Other services | 2017 |
| Northern Rights Social Enterprise Limited | Other services | 2014 |
| Northern Summit Adventure Limited | Administrative & support | 2025 |
| Northshore Logistics Ltd | Transport & logistics | 2026 |
| Northstar Competitions Ltd | Other services | 2025 |
| NOT Just Cards Ltd | Wholesale & retail | 2025 |
| Nova Turkish Barber Ltd | Other services | 2026 |
| Novalytix Limited | Information & communication | 2025 |
| Novo Heating & Plumbing Ltd | Construction | 2021 |
| Novo Quantum Ltd | Construction | 2009 |
| NOW DIG This Limited | Information & communication | 2003 |
| NOW IS Your Time Ltd | Professional & scientific | 2018 |
| NPI Building Supplies Ltd | Wholesale & retail | 2016 |
| NRG Events Ltd | Arts & recreation | 2022 |
| NS Food Services Ltd | Hospitality | 2019 |
| NSC Renewables Ltd | Construction | 2026 |
| NT Organik Enerji Sanayi VE Ticaret Ltd | Construction | 2019 |
| Nutex UK Limited | Wholesale & retail | 2011 |
| Oak Chapel Properties Ltd | Real estate | 2022 |
| Oakbridge Plumbing Ltd | Construction | 2025 |
| Oakwood Wills and Trusts Ltd | Professional & scientific | 2021 |
| Oatco Ltd | Agriculture & fishing | 2021 |
| Ocean Beach Management Ltd | Administrative & support | 2017 |
| Ocean Choices CIC | Health & social care | 2015 |
| Ocean Pearl 2024 Ltd | Hospitality | 2024 |
| Ocean RD Leisure Ltd | Hospitality | 2026 |
| Ocean RD Market Ltd | Wholesale & retail | 2025 |
| Ocean Road Centre | Health & social care | 2017 |
| Oceans Eleven Ltd. | Real estate | 2010 |
| OFR NE Ltd | Hospitality | 2025 |
| Oilquip Limited | Manufacturing | 2007 |
| Old School Window Cleaning Ltd | Administrative & support | 2025 |
| Oliver Kerry Ltd | Construction | 2026 |
| Oltide 1 RTM Company Limited | Households | 2025 |
| Oltide 2 RTM Company Limited | Households | 2025 |
| ON Alert Tyres Ltd | Wholesale & retail | 2025 |
| One Stop Tyres (NE) Ltd | Wholesale & retail | 2025 |
| One Stop Tyres (SS) Ltd | Wholesale & retail | 2019 |
| Online-Lpa Ltd | Administrative & support | 2025 |
| Only Dogs Allowed Ltd | Wholesale & retail | 2013 |
| Ontrackimages Ltd | Other services | 2017 |
| OPK Developments Ltd | Construction | 2022 |
| OPK Property Ltd | Real estate | 2022 |
| Optimal 24/7 Limited | Administrative & support | 2010 |
| Optimal Accountancy Limited | Professional & scientific | 2007 |
| Optimal Managed Services Limited | Professional & scientific | 2010 |
| Optipay Solutions Limited | Professional & scientific | 2024 |
| ORD Engineering Ltd | Professional & scientific | 2022 |
| Orion Risk Management UK Limited | Professional & scientific | 2024 |
| Osuji Limited | Real estate | 2023 |
| OUR 1 Community Ltd | Professional & scientific | 2021 |
| OUT There Equipped Ltd | Wholesale & retail | 2024 |
| Outside Socials Ltd | Hospitality | 2025 |
| Owens Inspection Ltd | Construction | 2023 |
| P and R Properties NE Ltd | Real estate | 2025 |
| P S Instrumentations Limited | Other services | 2015 |
| P Scott & SON Renewables Ltd | Energy | 2021 |
| P&J Property Investments NE Ltd | Real estate | 2024 |
| PA2GO Group Limited | Administrative & support | 2024 |
| Pace Distribution Ltd | Transport & logistics | 2015 |
| Pacinos Dany Ltd | Hospitality | 2020 |
| Palace Construction (NE) Ltd | Construction | 2026 |
| Palace Flooring Ltd | Construction | 2023 |
| Panda Eyes Ltd | Information & communication | 2026 |
| Panelshop Limited | Administrative & support | 2016 |
| Papa Smith Custom Ltd | Wholesale & retail | 2017 |
| Paperae Ltd | Wholesale & retail | 2023 |
| Parcel to Parcel Limited | Transport & logistics | 2025 |
| Parker Offshore Renewable Services Ltd | Construction | 2018 |
| Parkers & Young Ltd | Construction | 2002 |
| Parmstrong Property Ltd | Real estate | 2026 |
| Parul NE Ltd | Hospitality | 2022 |
| Passion 4 Travel Ltd | Administrative & support | 2025 |
| Paul C Limited | Energy | 2018 |
| Paul Caizley Inspection Services Limited | Construction | 2013 |
| Paul Carr Inspection Ltd | Construction | 2025 |
| Paul Fada Engineering Services Limited | Professional & scientific | 2009 |
| Paul J Wann Ltd | Real estate | 2022 |
| Paul Mort Ltd | Health & social care | 2010 |
| Paul Varty Access Ltd | Professional & scientific | 2018 |
| Paul Whelan Electrics Limited | Other services | 2007 |
| PC Electrical Services (N.E.) Limited | Construction | 2013 |
| PC Networks and Cabling Ltd | Administrative & support | 2014 |
| Pdrs Solutions Limited | Construction | 2019 |
| Peaches and Cream NE Ltd | Other services | 2022 |
| Pearl House Catering Ltd | Hospitality | 2026 |
| Pelham Consult Limited | Mining & quarrying | 2013 |
| Pellet Co Limited | Energy | 2015 |
| Pentagon Assurance Limited | Professional & scientific | 2017 |
| Perfect Blend NE Ltd | Health & social care | 2024 |
| Persons With Disability Britain Community Interest Company | Wholesale & retail | 2024 |
| Pete Graves Limited | Professional & scientific | 2008 |
| Peter Body Work Ltd | Wholesale & retail | 2017 |
| Peter Cowie Ltd | Construction | 2023 |
| Peter Easton North East Ltd | Construction | 2016 |
| Peters Coachworks Limited | Wholesale & retail | 2010 |
| Pets 2 Impress Limited | Other services | 2014 |
| PFC Take-Away Ltd | Hospitality | 2024 |
| PGJ Medics Ltd | Health & social care | 2019 |
| PGM Services Limited | Professional & scientific | 2003 |