| N & D London Limited | Construction | 1988 |
| N & M MIR Properties Ltd | Real estate | 2026 |
| N & P Trading Ltd | Wholesale & retail | 2019 |
| N a C Trading Holdings Limited | Professional & scientific | 2014 |
| N a College Limited | Education | 2005 |
| N a College Trust Limited | Professional & scientific | 2005 |
| N a Consultants Ltd | Professional & scientific | 2002 |
| N Begum Ltd | Professional & scientific | 2022 |
| N Daines Distribution Ltd | Transport & logistics | 2024 |
| N Devine Productions UK Limited | Administrative & support | 2023 |
| N E Cctv and Alarm Ltd | Wholesale & retail | 2023 |
| N E Groundcare Limited | Administrative & support | 2019 |
| N E MOT Centre Ltd | Wholesale & retail | 2017 |
| N H Property Ltd | Real estate | 2002 |
| N I Sattar Holdings Limited | Professional & scientific | 2014 |
| N L C Property Investments Limited | Real estate | 2020 |
| N L S Security Limited | Administrative & support | 2011 |
| N Mcgregor Property Investment Ltd | Real estate | 2019 |
| N Mcgregor Property Services Ltd | Construction | 2013 |
| N RAY Motors Ltd | Wholesale & retail | 2024 |
| N S Properties North East Limited | Real estate | 2024 |
| N&A NE Ltd | Mining & quarrying | 2023 |
| N&C Foxhall LLP | | 2020 |
| N&E Chana Properties Ltd | Construction | 2020 |
| N&G Brickwork Ltd | Construction | 2025 |
| N&P Domestic and Ironing Services Limited | Other services | 2012 |
| N-Able (North East) Limited | Health & social care | 2005 |
| N-Gage NE | Health & social care | 2008 |
| N-Lighten (North East) Limited | Education | 2003 |
| N-Rich Fitness (North East) Limited | Arts & recreation | 2012 |
| N.Castle Ltd | Hospitality | 2023 |
| N.Castle Pizza Ltd | Hospitality | 2026 |
| N.E Inspections Ltd | Construction | 2018 |
| N.E Research Ltd | Wholesale & retail | 2025 |
| N.E Resin Bound Ltd | Administrative & support | 2022 |
| N.E. I.T. Solutions Ltd | Information & communication | 2005 |
| N.E. Solutions Limited | Information & communication | 1999 |
| N.E.Printing Limited | Wholesale & retail | 2000 |
| N.R Ewart Group Limited | Construction | 2026 |
| N.U.T Engineering Ltd | Manufacturing | 2015 |
| N11 Ltd | Arts & recreation | 2026 |
| N17 Growth Partners Limited | Professional & scientific | 2018 |
| N21 Group Limited | Financial services | 2020 |
| N21 Limited | Professional & scientific | 2002 |
| NA CIP LLP | | 2019 |
| Nabi & Sons Limited | Hospitality | 2006 |
| Nabuza Ltd | Information & communication | 2025 |
| NAC Agency Limited | Administrative & support | 2009 |
| NAC MSS Limited | Education | 2007 |
| NAC Outsourcing Holdings Limited | Other services | 2018 |
| NAC Outsourcing Limited | Administrative & support | 2009 |
| NAC Trading Limited | Professional & scientific | 2004 |
| Nadanta Live Ltd | Information & communication | 2022 |
| Nadoron Biotech Ltd | Wholesale & retail | 2026 |
| Nads Signature Ltd | Wholesale & retail | 2023 |
| Nadz Modz Ltd | Wholesale & retail | 2025 |
| Nafanar Ltd | Administrative & support | 2018 |
| Nagar Group Ltd | Wholesale & retail | 2024 |
| Nagel Commerce Ltd | Wholesale & retail | 2026 |
| Nahia. Ltd | Health & social care | 2025 |
| Nahro Barbers Ltd | Other services | 2025 |
| Naijacrave UK Limited | Hospitality | 2026 |
| Naik Builders Ltd | Wholesale & retail | 2025 |
| Nails Lounge Limited | Other services | 2023 |
| Nailslab&Beauty Ltd | Other services | 2025 |
| Nailsworth (NO.1) Limited | Real estate | 2019 |
| Nailsworth (NO.2) Limited | Real estate | 2000 |
| Nailsworth (NO.3) Limited | Real estate | 2025 |
| Nailsworth (NO.4) Limited | Real estate | 2025 |
| Nailsworth (NO.5) Limited | Real estate | 2025 |
| Naim Residencies Limited | Households | 2026 |
| Naion Ltd | Professional & scientific | 2025 |
| Nairn Close (Sunderland) Limited | Households | 2003 |
| Naissance Cortex Limited | Information & communication | 2016 |
| Najaf Group Ltd | Wholesale & retail | 2023 |
| Najaf Jewellers Limited | Wholesale & retail | 2024 |
| Naked Deli North East Ltd | Hospitality | 2023 |
| Nalapooven UK Ltd | Wholesale & retail | 2026 |
| Nali Barbers Newcastle Ltd | Other services | 2023 |
| Naljets Ltd | Transport & logistics | 2015 |
| Nalla’S Stores Ltd | Wholesale & retail | 2025 |
| Namaha NCI Limited | Real estate | 2024 |
| Namaha Services Limited | Health & social care | 2019 |
| Namaste Taste of India Ltd | Wholesale & retail | 2018 |
| Namoke Limited | Construction | 2015 |
| Namx Ltd | Extraterritorial | 2019 |
| NAN Food and Wine Ltd | Wholesale & retail | 2025 |
| Nancella Group Ltd | Real estate | 2025 |
| Nand LAL Limited | Real estate | 2022 |
| Nanna Meg's Grooming Parlour Ltd | Other services | 2023 |
| Nano-Porous Solutions EBT Limited | Professional & scientific | 2008 |
| Nanovery Limited | Professional & scientific | 2018 |
| Napchi Ltd | Wholesale & retail | 2025 |
| Napier Court Management (Whickham) Limited | Real estate | 1976 |
| Napler Enterprises Ltd | Health & social care | 2026 |
| Naples Inspection Services Limited | Professional & scientific | 2011 |
| Naqvi & Bokhari Ltd. | Real estate | 2020 |
| NAR Ltd | Hospitality | 2007 |
| Narang Properties 2 Limited | Real estate | 2025 |
| Narang Properties Limited | Real estate | 2023 |