| Motion Holdings Ltd | Real estate | 2018 |
| Mount Parker Ltd. | Real estate | 2024 |
| Moveable Feast Outs Ltd | Health & social care | 2008 |
| Moving Memories Limited | Information & communication | 2012 |
| Mpac Concept HK Ltd | Manufacturing | 2023 |
| MR Grill Stanley One Limited | Hospitality | 2023 |
| Mrmm Ltd | Real estate | 2026 |
| Msteadoffshore Ltd | Construction | 2018 |
| MTF ENG Limited | Manufacturing | 2016 |
| MTM Made to Measure Ltd | Construction | 2025 |
| Murasaki Properties Limited | Real estate | 2025 |
| MW Haulage Ltd | Manufacturing | 2019 |
| Mylamade Limited | Manufacturing | 2025 |
| Nannieswell Ltd | Hospitality | 2020 |
| Nathan Birkett Ltd | Administrative & support | 2015 |
| National Glass Group (Holdings) Ltd | Manufacturing | 2015 |
| National Golf Clubs' Advisory Association Limited | Other services | 2014 |
| NBK Leisure Ltd | Arts & recreation | 2016 |
| Ncdat Support Services Limited | Information & communication | 2025 |
| Ncybotics Solution Limited | Information & communication | 2024 |
| NE Rigging Services Ltd | Information & communication | 2021 |
| NE Traders Ltd | Transport & logistics | 2022 |
| Necctv Ltd | Professional & scientific | 2019 |
| Neos Fire Blast Limited | Manufacturing | 2021 |
| Neos Protect Holdings Limited | Financial services | 2021 |
| Neos Protect Limited | Manufacturing | 2011 |
| Neos Technical Limited | Other services | 2019 |
| Netbiltech Ltd | Administrative & support | 2024 |
| Network Creative Ltd | Transport & logistics | 2011 |
| Neuro Connective CIC | Health & social care | 2026 |
| New Century Property Company Ltd. | Real estate | 2021 |
| New Image Clinic Ltd | Health & social care | 2023 |
| New Moti Jheel Ltd | Hospitality | 2024 |
| New Stanley Hand Car Wash Ltd | Administrative & support | 2019 |
| Newcastle Climbing Centre Limited | Arts & recreation | 2006 |
| Newcastle Vikings American Football CIC | Arts & recreation | 2014 |
| Newshield Designs Limited | Manufacturing | 1993 |
| Newt PS Limited | Agriculture & fishing | 2009 |
| Nextera International Ltd | Professional & scientific | 2021 |
| Nhms Property Limited | Real estate | 2020 |
| Nicholson Seals Limited | Extraterritorial | 2001 |
| Nicholson's Aircraft Seals Limited | Professional & scientific | 1973 |
| Nicholsons Sealing Technologies Limited | Manufacturing | 1923 |
| Nightingale Haulage Limited | Transport & logistics | 2009 |
| NMT HR Services Ltd | Administrative & support | 2013 |
| NO. 1 Thai Wellness Ltd | Wholesale & retail | 2021 |
| Noodle NE Ltd | Professional & scientific | 2018 |
| Nook and Nestings Ltd | Real estate | 2025 |
| North East Carriage Company Limited | Other services | 2009 |
| North East Creative Studios Limited | Professional & scientific | 2023 |
| North East Hot TUB Care Ltd | Administrative & support | 2024 |
| North East International Transport Limited | Transport & logistics | 2017 |
| North East Midweek Elite League Ltd | Education | 2025 |
| North East Play BUS Limited | Arts & recreation | 2022 |
| North East Provisions Limited | Wholesale & retail | 2020 |
| North East Sports Performance Ltd | Wholesale & retail | 2024 |
| North East Vehicle Keys Ltd | Extraterritorial | 2019 |
| North LAY Ltd | Construction | 2017 |
| Northeast Landscape and Gardening Services Ltd | Construction | 2021 |
| Northern Telecommunications Ltd | Information & communication | 2026 |
| Northern Traditional Homes Ltd | Construction | 2020 |
| Northshore Custom Conversions Ltd | Manufacturing | 2015 |
| Northumberland & Durham Aquatics Limited | Education | 2026 |
| Northumbria Water and GAS Limited | Construction | 2018 |
| Norwood PUB Ltd | Hospitality | 2012 |
| Nova Events & Entertainment Ltd | Arts & recreation | 2018 |
| NOW Transport Limited | Transport & logistics | 2026 |
| NRA Inspection Ltd | Professional & scientific | 2018 |
| NSH Vision Limited | Real estate | 2020 |
| NTH Logistics Ltd | Transport & logistics | 2025 |
| Number One Thai Massage Newcastle Ltd | Other services | 2014 |
| Numbers 626 Limited | Real estate | 2025 |
| NWR Asset Management Limited | Real estate | 2015 |
| NWR Hygiene Limited | Extraterritorial | 2012 |
| Occupy Marrs Ltd | Real estate | 2024 |
| Oexo Ltd | Information & communication | 2026 |
| OG Trade Limited | Wholesale & retail | 2025 |
| Ogilvy Harper Ltd | Education | 2014 |
| OJC Cold Roof Construction Ltd | Construction | 2024 |
| Oldfield's Consultancy Ltd | Professional & scientific | 2013 |
| Olive Store by RF Limited | Wholesale & retail | 2023 |
| OM Managed Support Limited | Information & communication | 2014 |
| Omnichieve Ltd | Real estate | 2020 |
| Omnifusion Ltd | Transport & logistics | 2023 |
| One Land Co. Ltd | Real estate | 2020 |
| Open North Foundation | Other services | 2017 |
| Open Property Data Association Ltd | Other services | 2023 |
| Orcalight Limited | Manufacturing | 2013 |
| Orcuma Ltd | Information & communication | 2011 |
| Ordify Direct Ltd | Wholesale & retail | 2024 |
| Oriane Ltd | Professional & scientific | 2022 |
| Overseasgo Ltd | Manufacturing | 2024 |
| Oxjp Ltd | Hospitality | 2024 |
| P & C P Jobling Ltd | Real estate | 2002 |
| P G & W Bolton Developments Ltd | Real estate | 2007 |
| P G & W Bolton Investments Ltd | Real estate | 2007 |
| P L S Windows and Doors Ltd | Extraterritorial | 2006 |
| P W & N Properties Ltd | Real estate | 2022 |
| P&C Property Solutions Limited | Real estate | 2023 |
| P&L Accountants Limited | Professional & scientific | 2020 |