| Nothern Enterprises Limited | Wholesale & retail | 2023 |
| Nothing IS Left Ltd | Wholesale & retail | 2021 |
| Notify Technology Ltd | Administrative & support | 2017 |
| Notion Music Recordings Ltd | Manufacturing | 2021 |
| Nour AL Wadi Limited | Hospitality | 2025 |
| Nourish Food School CIC | Education | 2021 |
| Nourish Newcastle Ltd | Hospitality | 2024 |
| Nourish Training Holdings Ltd | Financial services | 2021 |
| Nova Bakery Ltd | Manufacturing | 2026 |
| Nova Holdings Limited | Professional & scientific | 1987 |
| Nova Mentis Consulting Ltd | Professional & scientific | 2021 |
| Nova MG Investments Limited | Financial services | 2023 |
| Nova NE Ltd | Other services | 2024 |
| Nova Network Ltd | Real estate | 2018 |
| Nova Newcastle Ltd | Education | 2025 |
| Novabuild NCL Ltd | Construction | 2026 |
| Novacastrian Mundi Ltd | Other services | 2025 |
| Novant AI Ltd | Information & communication | 2026 |
| Novara Nexus Ltd | Other services | 2024 |
| Novaro Capital Holdings Limited | Arts & recreation | 2025 |
| Novashine Ltd | Other services | 2026 |
| Novastrand Ltd | Wholesale & retail | 2026 |
| Novavybe Ltd | Administrative & support | 2025 |
| Novelty HUT UK Ltd | Wholesale & retail | 2025 |
| November Design Ltd | Professional & scientific | 2014 |
| Novera Inc Ltd | Wholesale & retail | 2025 |
| Novera Trades Ltd | Wholesale & retail | 2026 |
| Novo Estates Limited | Real estate | 2024 |
| Novocastrian Painters and Decorators Limited | Construction | 2024 |
| Novum Safety and First AID Training Ltd | Health & social care | 2026 |
| NOW Transforming Smarter Futures Ltd | Professional & scientific | 2025 |
| Nozomi Interiors Limited | Construction | 2012 |
| NP Properties (NE) Ltd | Transport & logistics | 2025 |
| NP Traders Limited | Wholesale & retail | 2023 |
| NPB Site Services Ltd | Professional & scientific | 2023 |
| NPF 2016 Limited | Financial services | 2016 |
| NPG Crook Ltd | Real estate | 2022 |
| NPG Morpeth Limited | Wholesale & retail | 2021 |
| NPG NE Limited | Real estate | 2021 |
| NPG Wolsingham Limited | Wholesale & retail | 2023 |
| NPH Craster Ltd | Real estate | 2019 |
| NPL Sport (UK) Ltd | Arts & recreation | 2025 |
| NPS Caremore Limited | Manufacturing | 2002 |
| NPS Group Limited | Financial services | 2011 |
| NPS Management Limited | Administrative & support | 2007 |
| NRA Limited | Professional & scientific | 2005 |
| Nrfa Ltd | Other services | 2017 |
| NRL NE Ltd | Construction | 2025 |
| Nrsm Limited | Wholesale & retail | 2023 |
| Nrsoft Ltd | Information & communication | 2022 |
| Nrthrn Baby Ltd | Information & communication | 2020 |
| NRZ Chai Limited | Hospitality | 2022 |
| NS Automation North East Limited | Manufacturing | 2023 |
| NS Electrical Contractors Ltd | Construction | 2012 |
| NS Nexgen Innovations Ltd | Real estate | 2024 |
| NSE Services Limited | Administrative & support | 2019 |
| NSF Holdings Limited | Financial services | 1988 |
| Nslr Ltd | Health & social care | 2014 |
| NSR Innovations Limited | Professional & scientific | 2017 |
| NSS Franchising Ltd | Administrative & support | 2004 |
| NSS Real Estate Limited | Real estate | 2024 |
| NSS2 Real Estate Limited | Real estate | 2024 |
| NT Construction (NE) Ltd | Construction | 2021 |
| NT Diving Ltd | Construction | 2015 |
| NT North Limited | Transport & logistics | 2022 |
| NT Thermal Industrial Solutions Ltd | Manufacturing | 2018 |
| NTD (Newcastle) Ltd | Real estate | 2019 |
| NTJ Properties Limited | Professional & scientific | 2005 |
| Ntjn |Properties Limited | Professional & scientific | 2009 |
| Ntnsstudio Ltd | Professional & scientific | 2025 |
| NTR Green Room Limited | Hospitality | 2024 |
| Ntrs North East Limited | Wholesale & retail | 2023 |
| NTW Solutions Limited | Administrative & support | 2016 |
| Ntwork Limited | Information & communication | 2020 |
| NU Energi Ltd | Professional & scientific | 2023 |
| NU Space Homes (Ripon) Limited | Construction | 2021 |
| NU to Go Ltd. | Hospitality | 2016 |
| NU Workconnect Limited | Administrative & support | 2026 |
| Nuca Ltd | Wholesale & retail | 2024 |
| Nucasa Home Limited | Professional & scientific | 2022 |
| Nucasa Ltd. | Wholesale & retail | 2020 |
| Nucha Ltd | Other services | 2020 |
| Nuchido Limited | Manufacturing | 2017 |
| Nucleus Construction Ltd | Construction | 2026 |
| Nudge Education Access Limited | Education | 2019 |
| Nudge Education Limited | Education | 2016 |
| Nudge Minds Limited | Health & social care | 2019 |
| Nudo Leisure Ltd | Hospitality | 2013 |
| Nuinto Limited | Other services | 2006 |
| Nuleaf GAS & Power Limited | Administrative & support | 2023 |
| Nuleaf Projects Limited | Construction | 2018 |
| Number 3 Tankerville Place Jesmond (Management) Limited | Real estate | 1994 |
| Number One Jesmond Management Company Limited | Households | 2001 |
| Number One Trader Limited | Administrative & support | 2014 |
| NUMBER9TAKEAWAY Ltd | Hospitality | 2025 |
| Numero UNO Holiday Rentals Ltd | Households | 2024 |
| Numero UNO Leisure Rentals Ltd | Households | 2024 |
| Numero UNO Property Management Ltd | Real estate | 2025 |
| Numero UNO Property Rentals Ltd | Real estate | 2024 |
| Numi Scan Central Newcastle Limited | Health & social care | 2023 |