| Neocycled Limited | Manufacturing | 2025 |
| Neonickel (Blackburn) Limited | Wholesale & retail | 1993 |
| Neowiise Limited | Health & social care | 2021 |
| NEP Connect Limited | Information & communication | 2004 |
| Neptune Home Care Limited | Health & social care | 2018 |
| Neptune Professional Cleaning Ltd | Administrative & support | 2026 |
| Neptunes Kiss Ltd | Information & communication | 2020 |
| NER Services Limited | Hospitality | 2018 |
| Nereus Hertz Ltd | Professional & scientific | 2025 |
| Nero Nomads Limited | Wholesale & retail | 2024 |
| Nerveen Ltd | Health & social care | 2026 |
| NES Electric Ltd | Construction | 2016 |
| NES UK Holdings Limited | Financial services | 2015 |
| Nesaaba Company Limited | Wholesale & retail | 2023 |
| Nest Assured Inspections Ltd | Professional & scientific | 2026 |
| Nest Easybreeze Limited | Wholesale & retail | 2024 |
| Nest Europe Limited | Information & communication | 1998 |
| Nest Mental Health Limited | Health & social care | 2024 |
| Nesto Holdings Ltd | Real estate | 2021 |
| Nesy Ltd | Information & communication | 2022 |
| NET Intentions Ltd | Information & communication | 2014 |
| NET Value DRC Ltd | Professional & scientific | 2019 |
| NET Value PAY Limited | Information & communication | 2022 |
| Netcare Cabling Limited | Information & communication | 2011 |
| Netcom Business Solutions Ltd | Extraterritorial | 2005 |
| Netdzine Ltd | Information & communication | 2023 |
| Nether Hall (Aspley Guise) Residents Association Limited | Households | 1984 |
| Nething Consulting Ltd | Professional & scientific | 2022 |
| Netro Ltd | Extraterritorial | 2024 |
| Netro Technology Ltd | Information & communication | 2016 |
| Netrose Media Ltd | Administrative & support | 2020 |
| Netsgo Consulting Limited | Information & communication | 2022 |
| Nettgeo Ltd | Information & communication | 2025 |
| Network Guard (UK) Limited | Information & communication | 2022 |
| Network Property Buyers UK Limited | Real estate | 2026 |
| Neu-Venture Limited | Administrative & support | 2024 |
| Neuralfly Ltd | Professional & scientific | 2026 |
| Neuro 20 Technologies Limited | Wholesale & retail | 2025 |
| Neuro Physio Direct Ltd | Health & social care | 2024 |
| Neuroalgebra Limited | Information & communication | 2016 |
| Neurocogconsultant Ltd | Professional & scientific | 2023 |
| Neurodivergence Revived C.I.C. | Education | 2025 |
| Neuroinclusive Consult Ltd | Professional & scientific | 2026 |
| Neuronet Ltd | Information & communication | 2023 |
| Neurovia Systems UK Ltd | Professional & scientific | 2026 |
| Neutralcarbonzone Ltd | Information & communication | 2022 |
| Neutrix Limited | Information & communication | 2025 |
| Neutron Ventures Limited | Professional & scientific | 2008 |
| Nevard Consulting Limited | Professional & scientific | 2016 |
| Neversleep Games Ltd | Information & communication | 2023 |
| Neves Limited | Professional & scientific | 1988 |
| Neves Solicitors LLP | | 2012 |
| Neville Lofts Ltd | Construction | 2018 |
| Nevins Tools Ltd | Wholesale & retail | 2020 |
| NEVIS5 Limited | Information & communication | 2015 |
| New Bradwell Community Centre Limited | Arts & recreation | 2010 |
| New Breed Consultancy Limited | Wholesale & retail | 2015 |
| New China Garden Catering Limited | Hospitality | 2020 |
| New City Design Ltd | Real estate | 2014 |
| New City Heating Company Limited | Wholesale & retail | 1974 |
| New City Holdings MK Ltd | Wholesale & retail | 2018 |
| New City Landscapes Limited | Administrative & support | 2021 |
| New City Martial Arts Ltd | Arts & recreation | 2022 |
| New City Rental Properties Limited | Real estate | 2013 |
| New City Scaffolding Solutions Ltd | Construction | 2026 |
| New City Scales Limited | Manufacturing | 2016 |
| New City Taxis MK Ltd | Transport & logistics | 2024 |
| New Concept Homes Ltd | Construction | 2021 |
| New Conduit Consultancy Limited | Professional & scientific | 2022 |
| New Creations Catering Ltd | Hospitality | 2023 |
| New Culture Revolution Limited | Hospitality | 1992 |
| New Dawn Flat Management Ltd | Professional & scientific | 2004 |
| New Dawn Supported Living Limited | Hospitality | 2023 |
| New Duston Pre-School Limited | Education | 2006 |
| New ERA CAP Company Limited | Wholesale & retail | 2002 |
| New ERA IHB Limited | Financial services | 2025 |
| New GEN Media Limited | Professional & scientific | 2021 |
| New Hair Grow Solutions Ltd | Wholesale & retail | 2025 |
| New Horizons 68 Ltd | Health & social care | 2022 |
| New Life Church Milton Keynes | Other services | 2007 |
| New Mace Limited | Wholesale & retail | 2019 |
| New Medical Ltd | Health & social care | 2025 |
| New Park Retail Ltd | Wholesale & retail | 2026 |
| New Rajdouth Ltd | Hospitality | 2023 |
| New Start MK CIC | Professional & scientific | 2024 |
| New Terex Holdings UK Limited | Financial services | 1994 |
| New Town Sound Limited | Other services | 1965 |
| New Vision Brands Limited | Hospitality | 2024 |
| New Vision Coffee Europe Limited | Hospitality | 2012 |
| New Vision Coffee Limited | Hospitality | 2011 |
| New Vision Pretzel Limited | Hospitality | 2024 |
| New Walk Limited | Real estate | 2018 |
| New Waves Delivery Ltd | Transport & logistics | 2019 |
| New World Tax Limited | Professional & scientific | 2021 |
| Newbloks Ltd | Professional & scientific | 2024 |
| Newboxd Limited | Construction | 2022 |
| Newbridge International Trading Company Limited | Wholesale & retail | 2009 |
| Newcargo Ltd | Transport & logistics | 2026 |
| Newco Fruit Logistics Limited | Agriculture & fishing | 2024 |
| Newcoll Construction Limited | Construction | 2014 |