| North East Vehicle Repairs Limited | Wholesale & retail | 2025 |
| North Exhibition Services Ltd | Other services | 2009 |
| North Harbour Property Management Company (Phase Two) Limited | Households | 2018 |
| North Sea Volunteer Lifeguards | Education | 2004 |
| North Shore Consultancy Ltd | Professional & scientific | 2025 |
| North Swell Ltd | Arts & recreation | 2020 |
| North Tyneside Parent Carer Forum CIC | Education | 2020 |
| Northarc Energy Ltd | Energy | 2025 |
| Northdene Property Limited | Real estate | 2020 |
| Northeast Assessors Ltd | Professional & scientific | 2014 |
| Northeast Defender Camper Hire Limited | Administrative & support | 2024 |
| Northern Autotech UK Limited | Manufacturing | 2023 |
| Northern Electrical Rewinds Limited | Manufacturing | 1944 |
| Northern Hideaways Ltd | Arts & recreation | 2018 |
| Northern Latitude Limited | Information & communication | 2024 |
| Northern Shore Consulting Limited | Information & communication | 2014 |
| Northern Sprinkler Systems Limited | Construction | 2017 |
| Northern Whale Ltd | Information & communication | 2018 |
| Northernblack Ltd | Other services | 2020 |
| Northflow Performance Ltd | Hospitality | 2025 |
| Northridge Lofts and Conversions Ltd | Construction | 2026 |
| Northscreen Limited | Construction | 1996 |
| Northumberland Garden Services Ltd | Administrative & support | 2026 |
| Northumberland Investments Limited | Hospitality | 2016 |
| Northumberland Renovations Ltd | Construction | 2024 |
| Northumberland TS Ltd | Agriculture & fishing | 2020 |
| Northumberland Waste Removals Ltd | Water & waste | 2026 |
| Northumbria Community Radio Network CIC | Professional & scientific | 2026 |
| Northumbrian Heating & Plumbing Services Ltd | Construction | 2006 |
| Notesoft Solutions Ltd | Information & communication | 2018 |
| NPG Seaton Sluice Limited | Wholesale & retail | 2025 |
| Nucas Bootcamps Ltd | Arts & recreation | 2012 |
| Nuclear Earth Ltd | Manufacturing | 2025 |
| Numeraki Limited | Information & communication | 2013 |
| Nuovo Bathrooms Ltd | Wholesale & retail | 2020 |
| Nurun Nessa Ltd | Hospitality | 2025 |
| NVR Properties Ltd | Real estate | 2002 |
| O J Wade Limited | Construction | 2013 |
| Oak and Ledger Ltd | Education | 2025 |
| Oakland Consultancy Group Ltd | Professional & scientific | 2026 |
| Oakmund Emporium Ltd | Other services | 2026 |
| Oakwell Home Improvements Ltd | Construction | 2007 |
| Oakwood (North East) Limited | Wholesale & retail | 2008 |
| OBD2UK Limited | Professional & scientific | 2017 |
| Obvius Holdings Ltd | Administrative & support | 2018 |
| Ocean Geospatial Consultancy Ltd | Professional & scientific | 2025 |
| Ocean View Property Management Ltd | Real estate | 2020 |
| Ocean ZEN CIC | Health & social care | 2019 |
| Oddfellows Coffee Ltd | Hospitality | 2022 |
| Offloadr Ltd | Manufacturing | 2026 |
| OFI Taylor Ltd | Professional & scientific | 2025 |
| OIL & GAS (Staff) Ltd | Mining & quarrying | 2022 |
| Oliver Maintenance Company Limited | Households | 1976 |
| Omarket Ltd | Wholesale & retail | 2023 |
| OMG Hydroponics Ltd | Agriculture & fishing | 2014 |
| ON the Move Mortgage Services Ltd | Financial services | 2015 |
| Onda Deli Ltd | Hospitality | 2025 |
| One Stop Fulfilment Ltd | Transport & logistics | 2019 |
| One Two One Accounts Limited | Professional & scientific | 2012 |
| One Two One Books Limited | Professional & scientific | 2023 |
| Oneida Engineering Ltd | Professional & scientific | 2015 |
| Onyx VR Property Ltd | Real estate | 2024 |
| Open Dorr Management Systems Ltd | Professional & scientific | 2010 |
| Opptel Limited | Professional & scientific | 2018 |
| ORA Restaurant Bar Limited | Hospitality | 2018 |
| Oracy TV Ltd | Education | 2025 |
| Orange Peel IT Services Ltd | Information & communication | 2026 |
| Orange Sandwich Ltd | Arts & recreation | 2025 |
| Orange Sorbet Ltd | Administrative & support | 2024 |
| Orange Zebra Ltd | Professional & scientific | 2008 |
| Orbitai Ltd | Administrative & support | 2022 |
| Orchestra North East Productions Limited | Arts & recreation | 2018 |
| Oslo North East Ltd | Extraterritorial | 2024 |
| Otimotive Engineering Limited | Professional & scientific | 2024 |
| OUR North East Limited | Other services | 2025 |
| OWL Ventures Ltd | Arts & recreation | 2019 |
| Ozomor Brothers Ltd | Real estate | 2025 |
| Ozomor Care Services Ltd | Health & social care | 2023 |
| P & K Lifting and Safety Services Ltd | Professional & scientific | 2017 |
| P R Hayes IT Consultancy Limited | Information & communication | 2019 |
| P.C.Quinn Limited | Construction | 2016 |
| P.D. Inspection Engineers Ltd | Professional & scientific | 2006 |
| Pablo's Pawfectionary Limited | Wholesale & retail | 2025 |
| Pablos Pilgrim Ltd | Hospitality | 2025 |
| PAC Energy Solutions Ltd | Professional & scientific | 2012 |
| Paintek NE Ltd | Wholesale & retail | 2019 |
| Palah Limited | Information & communication | 2011 |
| Panama Swimming Club CIC | Education | 2025 |
| Panama View Management Limited | Real estate | 2010 |
| Panchami Limited | Real estate | 2020 |
| Pantrini Whitley Bay Limited | Hospitality | 2021 |
| Paper Dove (Construction) Ltd | Real estate | 2023 |
| Papillon Pizza (NE) Ltd | Hospitality | 2020 |
| Parade (Whitley Bay) Limited | Hospitality | 2014 |
| Paragon Aesthetics Limited | Health & social care | 2016 |
| Paragon of Health Ltd | Health & social care | 2025 |
| Pardbs Ltd | Wholesale & retail | 2024 |
| Park Lodge Hotel Limited | Hospitality | 1981 |
| Part Time Accountants Ltd | Professional & scientific | 2012 |
| Part Time Company Secretary Ltd | Professional & scientific | 2012 |