| NFJ Rigging and Lifting Ltd | Construction | 2026 |
| Ngenyx Ltd | Extraterritorial | 2022 |
| NGP (Teeside) Ltd | Hospitality | 2021 |
| Ngra Ltd | Professional & scientific | 2022 |
| Ngup Limited | Administrative & support | 2025 |
| NHT Automotive Ltd | Wholesale & retail | 2025 |
| Niche Education Ltd | Administrative & support | 2020 |
| Niche Technology UK Limited | Information & communication | 2004 |
| Nicholson Online Ltd | Wholesale & retail | 2022 |
| Nicks Cleaning Ltd | Administrative & support | 2025 |
| Nidak Solutions Ltd | Manufacturing | 2025 |
| Nifco UK Limited | Manufacturing | 1978 |
| Nigel Stoves Plumbing and Heating Limited | Construction | 2012 |
| Night Hawk Limited | Wholesale & retail | 2002 |
| Nightingales Community Care Limited | Health & social care | 2015 |
| NIM Singh Limited | Hospitality | 2022 |
| Nimblyra Limited | Professional & scientific | 2015 |
| Ninefour Consulting Limited | Professional & scientific | 2012 |
| Nissah Limited | Health & social care | 2025 |
| Nithy Convenience Ltd | Wholesale & retail | 2023 |
| Nithy Property Ltd | Real estate | 2021 |
| Nithy Retails Ltd | Wholesale & retail | 2020 |
| Nithy Retails UK Ltd | Wholesale & retail | 2015 |
| Nixdy Limited | Information & communication | 2005 |
| Nixon Fabrication Services Limited | Administrative & support | 2017 |
| NJ Housing Consultancy Ltd | Professional & scientific | 2024 |
| NJL Flooring Services Limited | Construction | 2014 |
| Nk.Sarang Limited | Wholesale & retail | 2025 |
| Nkjj Limited | Other services | 2023 |
| NLS Professional Cleaning Ltd | Administrative & support | 2026 |
| NM Burger Head Central Ltd | Hospitality | 2020 |
| NM Burger Head Franchise Ltd | Hospitality | 2020 |
| NM Burger Head IP Ltd | Hospitality | 2020 |
| NM Burger Head Location Ltd | Hospitality | 2020 |
| NM Burger Head OPS Ltd | Hospitality | 2020 |
| NM Burger Head Supply Chain Ltd | Hospitality | 2021 |
| NM Burger Location 102 Ltd | Hospitality | 2020 |
| NM Burger Location 104 Ltd | Hospitality | 2020 |
| NM Burger Location 108 Ltd | Hospitality | 2021 |
| NMC Offshore Safety Solutions Ltd. | Energy | 2023 |
| NMH Group Ltd | Real estate | 2024 |
| NN Foods Stockton Ltd | Hospitality | 2024 |
| NO Bull Finance Ltd | Financial services | 2025 |
| NO SUB Services Limited | Construction | 2014 |
| Nobia & Sons Ltd | Hospitality | 2020 |
| Noble Brothers Funfairs Limited | Arts & recreation | 2012 |
| Noble Cabs Ltd | Transport & logistics | 2026 |
| Noble Catering Services Limited | Hospitality | 2002 |
| Noble Painting Ltd | Construction | 2016 |
| Nobles Events (NE) Ltd | Hospitality | 2021 |
| Nobles Leisure Ltd | Arts & recreation | 2024 |
| Nola Property Ltd | Real estate | 2025 |
| NOM Stockton Ltd | Hospitality | 2026 |
| NOM to Go Ltd | Hospitality | 2025 |
| Nomadic Events Ltd | Arts & recreation | 2015 |
| Norden Day Service Limited | Other services | 2014 |
| Nordic Products & Services Ltd | Professional & scientific | 2014 |
| Normak Retail Ltd | Wholesale & retail | 2019 |
| Normalplan Properties Limited | Real estate | 1982 |
| Norrfase Ltd | Construction | 2026 |
| Norse Cottage Management Limited | Real estate | 2025 |
| North Brunton Park Management Company Limited | Real estate | 2005 |
| North Capital Equipment Limited | Other services | 1997 |
| North East (Software) Development Ltd | Information & communication | 2022 |
| North East ARB Limited | Construction | 2006 |
| North East Building Plastics Limited | Wholesale & retail | 2014 |
| North East Electrical Access Limited | Construction | 2017 |
| North East Executive Limited | Wholesale & retail | 2009 |
| North East Heating and Cooling Ltd | Construction | 2017 |
| North East Hybrid Center Ltd | Wholesale & retail | 2026 |
| North East Logistics Academy Ltd | Administrative & support | 2026 |
| North East Motor Salvage Limited | Wholesale & retail | 1985 |
| North East Plumbing and Heating Limited | Construction | 2020 |
| North East Refurbishments Ltd | Construction | 2010 |
| North East Safety Boats and Co. Limited | Transport & logistics | 2014 |
| North East Svcs Limited | Wholesale & retail | 2026 |
| North Eastern Accident Repair Ltd | Wholesale & retail | 2010 |
| North Electrics Ltd | Construction | 2016 |
| North Star Groundworks Ltd | Professional & scientific | 2019 |
| North Trail Financial Planning Ltd | Professional & scientific | 2020 |
| Northcote Management Ltd | Administrative & support | 2016 |
| Northeast Construction Solutions Ltd | Construction | 2026 |
| Northeastfireinstallations Ltd | Construction | 2025 |
| Northedge Machinery Sales Ltd | Wholesale & retail | 2025 |
| Northerly Capital Limited | Financial services | 2026 |
| Northerly Services Limited | Wholesale & retail | 2026 |
| Northern Amber Group Ltd | Other services | 2022 |
| Northern Bulk Services Ltd | Transport & logistics | 2024 |
| Northern Chemical Solutions Ltd | Professional & scientific | 2024 |
| Northern County Leisure Limited | Transport & logistics | 1990 |
| Northern Distribution Ltd. | Transport & logistics | 1996 |
| Northern Heating Spares (Middlesbrough) Limited | Wholesale & retail | 2018 |
| Northern Land Management Limited | Construction | 2014 |
| Northern Properties Group Limited | Households | 2019 |
| Northern Quarters Ltd | Real estate | 2024 |
| Northern Quill Concepts Ltd | Arts & recreation | 2019 |
| Northern Renewable Experts Ltd | Construction | 2025 |
| Northern Rigging Systems Ltd | Mining & quarrying | 2023 |
| Northern School of Marketing Ltd | Education | 2025 |
| Northern Steam Engineering Limited | Professional & scientific | 2017 |