| Northeast Meats NE Ltd | Wholesale & retail | 2026 |
| Northeast Plant Specialists Ltd | Agriculture & fishing | 2019 |
| Northeast Removals & Logistics Ltd | Transport & logistics | 2016 |
| Northeast Turbines UK Limited | Manufacturing | 2025 |
| Northeastautos Ltd | Wholesale & retail | 2025 |
| NORTHEASTPLATES4U Ltd | Wholesale & retail | 2025 |
| Northend Inspection Services Limited | Professional & scientific | 2015 |
| Northern Access Advisory CIC | Professional & scientific | 2026 |
| Northern Apprenticeship Company Limited | Education | 2008 |
| Northern Bear Automotive Ltd | Financial services | 2023 |
| Northern Clothing (Shildon) Limited | | 1944 |
| Northern Construct Limited | Construction | 2023 |
| Northern Corporation Ltd | Real estate | 2025 |
| Northern Dales Farmers Market Limited | Hospitality | 2002 |
| Northern General Properties Limited | Real estate | 1939 |
| Northern Heating and Plumbing Supplies Ltd | Wholesale & retail | 2023 |
| Northern Lights Consultants Ltd | Real estate | 2016 |
| Northern Machine Tools (Engineering) Limited | Manufacturing | 1973 |
| Northern Neuro Rehab Limited | Health & social care | 2024 |
| Northern Ocean Limited | Transport & logistics | 2021 |
| Northern Plant Services Ltd | Manufacturing | 2021 |
| Northern Properties Investments Limited | Real estate | 2021 |
| Northern Rivers Ltd | Transport & logistics | 2025 |
| Northern Roofing & Cladding Services Limited | Construction | 2016 |
| Northern School of Art Devco Limited | Construction | 2018 |
| Northern Shakers Limited | Hospitality | 2017 |
| Northern Skills Group Business Services Limited | Education | 1987 |
| Northern Solutions Ltd | Water & waste | 2021 |
| Northern Spectre Airsoft Ltd | Arts & recreation | 2023 |
| Northern Stars NE Ltd | Arts & recreation | 2023 |
| Northern Sunblinds Limited | Other services | 2003 |
| Northern Sustainability Consultants Ltd | Professional & scientific | 2023 |
| Northfin Fish Foods UK Ltd | Wholesale & retail | 2019 |
| Northnest Limited | Real estate | 2025 |
| Northrak Ltd | Information & communication | 2022 |
| Northsafe Group Ltd | Professional & scientific | 2026 |
| Northside Property Maintenance Limited | Construction | 2020 |
| Northstead Properties Ltd | Real estate | 2014 |
| Northstone Remedials Limited | Construction | 2026 |
| Northsyde Global Ltd | Arts & recreation | 2026 |
| Norton Road Car Wash Ltd | Other services | 2024 |
| Norton Solutions Limited | Other services | 2014 |
| Nosh Healthy Kitchen Ltd | Hospitality | 2015 |
| Notegrade Limited | Education | 2023 |
| Notenoughtech Ltd | Information & communication | 2025 |
| Nothing Else Limited | Wholesale & retail | 2019 |
| Nouveau Legal and Property Services Limited | Professional & scientific | 2026 |
| Nouveau Property Limited | Real estate | 2025 |
| Nouveau Wellbeing CIC | Other services | 2008 |
| Nova Pangaea (Holdings) Ltd | Professional & scientific | 2016 |
| Nova Pangaea Technologies (UK) Limited | Manufacturing | 2014 |
| Nova Real Estate NE Ltd | Real estate | 2023 |
| Novacaesar Ltd | Wholesale & retail | 2025 |
| Novalayer Ltd | Manufacturing | 2026 |
| Novanew Ltd | Wholesale & retail | 2009 |
| Novaroom Homes Ltd | Real estate | 2020 |
| Novavitality Ltd | Wholesale & retail | 2025 |
| Novella Aesthetics Tees Valley Ltd | Other services | 2025 |
| Novus Commercial Properties Ltd | Households | 2025 |
| Novus Integ Ltd | Administrative & support | 2021 |
| Novus Property Group Ltd | Households | 2025 |
| Nowak Ltd | Transport & logistics | 2026 |
| NP Trading Ltd | Wholesale & retail | 2019 |
| NP05 Renewables Ltd | Professional & scientific | 2026 |
| NPA Human Resources Consultancy Limited | Administrative & support | 2018 |
| NPA Strategic Consultancy Limited | Professional & scientific | 2020 |
| NPS25 Limited | Construction | 2025 |
| Npsj Limited | Construction | 2024 |
| Npvg Ltd | Real estate | 2022 |
| NRG 4 Business Limited | Wholesale & retail | 2008 |
| NRG Home & Leisure Limited | Wholesale & retail | 2022 |
| NRT Engineering Ltd | Professional & scientific | 2020 |
| NS (NE) Properties Ltd | Real estate | 2020 |
| NS Financial (Teesside) Limited | Financial services | 2018 |
| NS Lettings Ltd | Real estate | 2006 |
| NS Plumbing and Maintenance Ltd | Construction | 2021 |
| NSA Fleet (NE) Ltd | Transport & logistics | 2025 |
| NSG Events & Memorabilia Ltd | Arts & recreation | 2025 |
| NSL Investments Limited | Agriculture & fishing | 2008 |
| NST Project Management Limited | Real estate | 2008 |
| NSW Tech Ltd | Professional & scientific | 2024 |
| NTA Centre Ltd | Arts & recreation | 2016 |
| NTR Holdings Limited | Construction | 2021 |
| NTS Fabrications Ltd. | Manufacturing | 1992 |
| Nude & Glow Aesthetics Ltd | Other services | 2025 |
| Nudl Limited | Administrative & support | 2020 |
| Nunthorpe Car Sales Ltd | Wholesale & retail | 2025 |
| Nunthorpe Fisheries Ltd | Hospitality | 2019 |
| Nunthorpe Hall Care Limited | Health & social care | 2023 |
| Nunthorpe Instrumentation Services Ltd | Professional & scientific | 2022 |
| Nunthorpe Landscapes & Property Services Ltd | Administrative & support | 2026 |
| Nunthorpe Nurseries Group Ltd | Other services | 2000 |
| Nunthorpe Nurseries Group Training Ltd | Education | 2024 |
| Nunthorpe WAX Co. Ltd | Manufacturing | 2023 |
| Nupave Exterior Cleaning Ltd | Construction | 2025 |
| Nurture Mental Health Limited | Professional & scientific | 2007 |
| Nutex Consultancy Ltd | Health & social care | 2025 |
| Nuts Oasis Ltd | Wholesale & retail | 2022 |
| Nuuhaus Ltd | Construction | 2023 |
| NV Hire Ltd | Construction | 2026 |