| Newbury Taxi Ltd | Transport & logistics | 2005 |
| Newbury Theatre School LLP | | 2025 |
| Newbury Tool Hire Limited | Extraterritorial | 2002 |
| Newbury Tools Limited | Wholesale & retail | 1976 |
| Newbury Transmissions Ltd | Wholesale & retail | 2013 |
| Newbury Vehicle Hire Limited | Administrative & support | 2018 |
| Newbury Welding Supplies Limited | Manufacturing | 1985 |
| Newbury Wines UK Ltd | Wholesale & retail | 2017 |
| Newbury Yacht Club Limited | Arts & recreation | 2014 |
| Newell Property Group Ltd | Real estate | 2021 |
| Newitt Holdings Ltd | Financial services | 2023 |
| Newpop Limited | Hospitality | 2025 |
| Newton Leys Consulting Limited | Information & communication | 2016 |
| Newtown Common Residents Association Limited | Other services | 2006 |
| Newtrack Project Direction Ltd | Other services | 2014 |
| Nexcode Solutions Ltd | Information & communication | 2024 |
| Next Generation Data Infrastructure 1 Limited | Information & communication | 2016 |
| Next Generation Data Infrastructure 2 Limited | Information & communication | 2016 |
| Nextivity Limited | Professional & scientific | 2008 |
| Nextlogic Limited | Information & communication | 2025 |
| Nexus Energy Group Ltd | Other services | 2024 |
| Nfauna Ltd | Wholesale & retail | 2025 |
| Nfit Ltd | Financial services | 2024 |
| Nfru Limited | Professional & scientific | 2015 |
| Ngako Ltd | Real estate | 2017 |
| NGG Consulting Ltd | Information & communication | 2022 |
| Nice Touch Group Ltd | Information & communication | 2025 |
| Nicholas CAD Services Ltd | Administrative & support | 2013 |
| Nicholas Wharf Management Company Limited | Households | 2012 |
| Nick & Co Clearance Ltd | Transport & logistics | 2023 |
| Nick Robins Limited | Administrative & support | 2004 |
| Nick Watts Digital Limited | Professional & scientific | 2015 |
| Nickpetrov Ltd | Transport & logistics | 2019 |
| Nickson Travel Ltd | Administrative & support | 2021 |
| Nidra Properties Limited | Construction | 2025 |
| Nila(Global) Ltd | Real estate | 2024 |
| Nine Four Ltd. | Professional & scientific | 2015 |
| Ninetek Consulting Services Ltd | Information & communication | 2013 |
| Niotech Ltd | Wholesale & retail | 2021 |
| Niveko Pools UK Ltd | Wholesale & retail | 2006 |
| Niven Wealth Management Ltd | Financial services | 2016 |
| NMH Consulting Limited | Professional & scientific | 2026 |
| NMP Construction (Newbury) Ltd. | Construction | 2004 |
| Nnpn Homecare Limited | Health & social care | 2018 |
| NO Filter Newbury Limited | Other services | 2023 |
| NO More Nettles Ltd | Administrative & support | 2021 |
| NO More Spreadsheets Ltd | Professional & scientific | 2017 |
| NO96 Ltd | Wholesale & retail | 2022 |
| Nodeone Limited | Information & communication | 2015 |
| Nonagonix Ltd | Manufacturing | 2026 |
| Norbain Distribution Limited | Extraterritorial | 2012 |
| Norbain Group Limited | Extraterritorial | 2012 |
| Norbain Holdings Limited | Wholesale & retail | 2007 |
| Norbain Limited | Extraterritorial | 2012 |
| Norbain SD Limited | Extraterritorial | 2014 |
| Nordi Sales Limited | Administrative & support | 2008 |
| Nordic Challenge (UK) Ltd. | Arts & recreation | 2003 |
| Norma UK Limited | Manufacturing | 1981 |
| Norrie Johnston Recruitment Ltd | Administrative & support | 2013 |
| North East West South Limited | Extraterritorial | 1993 |
| North Point Studio Ltd | Information & communication | 2024 |
| North View Lodge Ltd | Administrative & support | 2017 |
| Northcroft Park (Newbury) Limited | Households | 2011 |
| Northcroft Residents Management Company Limited | Households | 2002 |
| Northfield Estate Management Company Limited | Households | 2009 |
| Not(E)Boards Limited | Professional & scientific | 2018 |
| Notre Leaf Ltd | Real estate | 2020 |
| Noubles Healthcare Limited | Administrative & support | 2020 |
| Nova Yantra Ltd | Information & communication | 2025 |
| Novo Auto Ltd | Wholesale & retail | 2017 |
| Nowatt Ltd. | Information & communication | 2007 |
| Noxam Ltd | Professional & scientific | 2022 |
| Noxbyte Limited | Information & communication | 2022 |
| NP4UK Limited | Extraterritorial | 2012 |
| Nritouch Ltd | Administrative & support | 2026 |
| NRW Air Conditioning Ltd | Construction | 2020 |
| Nsfr Limited | Administrative & support | 2011 |
| Nsq-Pharmaservices Limited | Other services | 2023 |
| NTA Audit Limited | Professional & scientific | 2025 |
| Ntcart Limited | Wholesale & retail | 2026 |
| NTS Group Fzlle Limited | Administrative & support | 2016 |
| NTS Group Holding Ltd | Professional & scientific | 2020 |
| Number Eight Hair & Beauty Ltd | Professional & scientific | 2026 |
| Numberwork Services Limited | Professional & scientific | 2022 |
| Numbuzz Research Ltd | Professional & scientific | 2016 |
| Nurse Electrical Limited | Construction | 1996 |
| Nurture and Connect Therapy Limited | Health & social care | 2025 |
| Nurture Pathways Collective Ltd | Education | 2026 |
| Nustream Ltd | Information & communication | 2011 |
| Nutkins Farm Limited | Households | 2015 |
| Nutley and Nutley Limited | Information & communication | 2001 |
| Nutrition Rebalanced Ltd | Professional & scientific | 2026 |
| Nuweb Studio Ltd | Information & communication | 2025 |
| NVC23 Limited | Manufacturing | 2023 |
| NVP22 Ltd | Real estate | 2022 |
| NW Tree Solutions Ltd | Agriculture & fishing | 2025 |
| NWC & Associates Ltd | Extraterritorial | 2005 |
| O'Bryan-Tear Consulting Limited | Professional & scientific | 2017 |
| O'Gorman Equine Veterinary Limited | Professional & scientific | 2014 |
| O'Gorman Slater Main & Partners LLP | | 2010 |