| Locale Property Limited | Real estate | 2021 |
| Longrigg Road MOT Centre Ltd | Wholesale & retail | 2020 |
| LS Bray Estates Ltd | Real estate | 2026 |
| Lulu Animation Limited | Extraterritorial | 2022 |
| Luxe Lounge Hair and Beauty Ltd | Other services | 2020 |
| M B Custom Carpentry Ltd | Manufacturing | 2021 |
| M C Images Ltd | Wholesale & retail | 2019 |
| M J Nicols Plumbing & Heating Limited | Construction | 2007 |
| M3G Property Group Limited | Professional & scientific | 2025 |
| Magic Touch Car Wash Ltd | Administrative & support | 2025 |
| Malatang Express Ltd | Hospitality | 2024 |
| Mama Baby Ltd | Wholesale & retail | 2024 |
| Mark J Gray Building Services Limited | Construction | 2018 |
| Mark Taylor Consulting Limited | Professional & scientific | 2012 |
| Marlo Electricals Ltd | Construction | 2020 |
| MAV Services Ltd | Administrative & support | 2003 |
| Maven Engineering Ltd | Construction | 2025 |
| Mccann Storage Ltd | Transport & logistics | 2021 |
| Mccoy Enterprises Ltd | Professional & scientific | 2025 |
| Mccoy Vending Ltd | Wholesale & retail | 2025 |
| Mcdowall Property Services Ltd | Manufacturing | 2010 |
| Merida Homes Ltd | Real estate | 2018 |
| Metro Air Conditioning Limited | Energy | 2018 |
| Mill Properties 12 Limited | Real estate | 2025 |
| Mitchell Transport Services Ltd | Transport & logistics | 2016 |
| MO Quality Cars Limited | Wholesale & retail | 2022 |
| Mole Tech Solutions Ltd | Construction | 2015 |
| Momont Limited | Professional & scientific | 2020 |
| Moulin Pizza Limited | Hospitality | 2025 |
| MS Brick Cutting Limited | Manufacturing | 2018 |
| Mullen TTS Limited | Wholesale & retail | 2025 |
| Murph Made Joinery Ltd | Construction | 2026 |
| My Dog Barber Limited | Other services | 2016 |
| N E Drinks Ltd | Wholesale & retail | 2025 |
| N&S Property Estates Limited | Real estate | 2017 |
| N.Dodd LMT Limited | Professional & scientific | 2026 |
| N.E. Vehicle Conversions Limited | Manufacturing | 2025 |
| Nardda Ltd | Real estate | 2024 |
| Narissa Ltd | Information & communication | 2017 |
| Nathetics Beauty Limited | Other services | 2024 |
| Natural Stockcare Limited | Manufacturing | 1984 |
| Ncave Ltd | Hospitality | 2026 |
| NCJ Works Ltd | Administrative & support | 2021 |
| NE Youth Limited | Other services | 2010 |
| Neuroanima Limited | Professional & scientific | 2025 |
| Newcastle Beds Limited | Other services | 2018 |
| Ninety Degrees Surveying Ltd | Administrative & support | 2007 |
| Nitaksh Limited | Wholesale & retail | 2020 |
| NJ Mcleod Limited | Construction | 2025 |
| NJM Waste Removal Ltd | Water & waste | 2025 |
| NO Floor NO More CIC | Health & social care | 2022 |
| North East Damp Proofing Ltd | Construction | 2025 |
| North East Duct Supply Ltd | Manufacturing | 2024 |
| North East Game Ltd | Arts & recreation | 2024 |
| North East Haulage Services Ltd | Transport & logistics | 2025 |
| North Eastern Powder Coating Limited | Manufacturing | 1993 |
| Northeast Damp Control Ltd | Construction | 2026 |
| Northeast Party & Events Ltd | Professional & scientific | 2018 |
| Northern Catering Ltd | Hospitality | 2019 |
| Northern Dwellings Ltd | Real estate | 2017 |
| Northern Garden Sheds Ltd | Manufacturing | 2013 |
| Northern Stationery (UK) Limited | Wholesale & retail | 2007 |
| Northern Web Development Ltd | Information & communication | 2022 |
| Northstar Vehicle Management Limited | Wholesale & retail | 2026 |
| Nova Castria Design Ltd | Professional & scientific | 2018 |
| Nova Castria Ltd | Professional & scientific | 2018 |
| NV Aesthetic Wholesale Ltd | Wholesale & retail | 2025 |
| Nyatwa & Maps Ltd | Health & social care | 2024 |
| Oak Mantels Direct Ltd | Manufacturing | 2025 |
| Oakridge Holdco Ltd | Financial services | 2021 |
| Old Maintenance Limited | Manufacturing | 2021 |
| Old Storage Limited | Administrative & support | 2015 |
| OMC Blaydon Ltd | Hospitality | 2025 |
| Onefold Ltd | Manufacturing | 2017 |
| Onyx Security Services Ltd | Administrative & support | 2023 |
| Optimise Biosolutions Ltd | Professional & scientific | 2024 |
| Orieoma Grace Ltd | Health & social care | 2023 |
| OWS Sport Ltd | Arts & recreation | 2023 |
| P & N Associates Limited | Hospitality | 1999 |
| Pace Consultancy UK Limited | Professional & scientific | 2008 |
| Pamboes Clothing Limited | Wholesale & retail | 2023 |
| Pantera Investment Group Ltd | Real estate | 2025 |
| Paradigm Security Consultancy Ltd | Information & communication | 2011 |
| Parkers Electrical Services Ltd | Construction | 2021 |
| PAS Transport Ltd | Transport & logistics | 2019 |
| PAY AS YOU Glow Limited | Construction | 2019 |
| PBM North East Ltd | Other services | 2023 |
| PCN (North East) Ltd | Construction | 2019 |
| Pearson Supply Limited | Wholesale & retail | 2025 |
| Peel Consultancy Services Limited | Professional & scientific | 2016 |
| Penal Reform Solutions Limited | Professional & scientific | 2016 |
| Peter PAN Investments & Acquisitions Ltd | Administrative & support | 2024 |
| Petroplus Limited | Wholesale & retail | 2025 |
| Petsercise Zone 1 Ltd | Other services | 2018 |
| PGB Properties Limited | Real estate | 2022 |
| Phaze Scaffold Ltd | Manufacturing | 2023 |
| Photobooth Props Ltd | Wholesale & retail | 2016 |
| Pieri Events Limited | Hospitality | 2024 |
| Pioneer (Luminum) Ltd | Manufacturing | 1996 |
| Pioneer Serviced Properties Ltd | Hospitality | 2013 |