| Naturally Wood Oxford Ltd | Manufacturing | 2014 |
| Nature Based Initiative Ltd | Professional & scientific | 2024 |
| Nature-Based Insights Ltd | Professional & scientific | 2021 |
| Naturix Ltd | Hospitality | 2025 |
| Nautiques UK Ltd | Manufacturing | 2006 |
| Naveen Saxen Ltd | Information & communication | 2017 |
| Navigate IP Limited | Professional & scientific | 2018 |
| Nawaz Property Oxford Ltd | Real estate | 2024 |
| Naya Thai Spa Ltd | Health & social care | 2026 |
| NAZ Couriers Ltd | Administrative & support | 2020 |
| NB Consulting (UK) Limited | Information & communication | 2014 |
| NB Contracting Oxford Ltd | Administrative & support | 2026 |
| NBS Europe Limited | Administrative & support | 2011 |
| NCA Services Ltd | Health & social care | 2026 |
| NCC-1701 Properties Limited | Real estate | 2019 |
| ND Rogers Electrical Ltd | Construction | 2020 |
| Ndoj Construction Ltd | Construction | 2022 |
| Nduta Express Ltd | Transport & logistics | 2025 |
| NE Plumbing & Heating Solutions Ltd | Construction | 2018 |
| Neagle Planning Ltd | Professional & scientific | 2025 |
| Nebula Softworks Ltd | Information & communication | 2024 |
| Neco International Limited | Health & social care | 2015 |
| NED Associates Limited | Information & communication | 2017 |
| Nedschroef Fasteners Limited | Wholesale & retail | 1985 |
| Need Components Limited | Professional & scientific | 1920 |
| NEF Istanbul Ltd | Hospitality | 2022 |
| Neha Cars Ltd | Transport & logistics | 2023 |
| Neil Warner Mrtpi Limited | Real estate | 2016 |
| Neil's Autos Limited | Wholesale & retail | 2011 |
| Nekta Limited | Information & communication | 2020 |
| Nellysam Limited | Health & social care | 2019 |
| Nelson Thornes Limited | Information & communication | 1972 |
| NEO GR. Limited | Administrative & support | 2010 |
| Neorgan Limited | Manufacturing | 2025 |
| Nepalese Mart Ltd | Wholesale & retail | 2021 |
| Neptunus UK Trading Limited | Information & communication | 2020 |
| Nero Finance Ltd | Real estate | 2018 |
| Nescan Group Ltd | Wholesale & retail | 2021 |
| Nest and Feathers Life Ltd | Information & communication | 2026 |
| Nestor Consulting Limited | Professional & scientific | 2012 |
| NET Effect Limited | Professional & scientific | 2016 |
| Netvide Limited | Information & communication | 2001 |
| Network Distributing Group Ltd | Information & communication | 2020 |
| Networkpharma Limited | Information & communication | 2002 |
| Neurocraft Studios Ltd | Manufacturing | 2023 |
| Neurodev Consultations Ltd | Health & social care | 2023 |
| Neurodiuniverse - WE ARE WHO WE ARE CIC | Wholesale & retail | 2023 |
| Neurodiverse Voices Connect CIC | Health & social care | 2026 |
| Neuroreporting Ltd | Professional & scientific | 2016 |
| Neutronix Ltd | Professional & scientific | 2013 |
| Never Second Services LLP | | 2008 |
| Nevermind AI Ltd | Professional & scientific | 2021 |
| Nevisa Limited | Construction | 2025 |
| New Books Limited | Information & communication | 2017 |
| New Bridge Communications Limited | Professional & scientific | 2022 |
| New Business Model Consulting Limited | Professional & scientific | 2000 |
| New Cafe Baba Limited | Hospitality | 2018 |
| New Care Roots Academy Ltd | Education | 2026 |
| New Care Roots Ltd | Administrative & support | 2023 |
| New Catalyst Associates Limited | Professional & scientific | 2001 |
| New Chequers Ltd | Hospitality | 2022 |
| New College Commemoration Ball Limited | Other services | 2021 |
| New Driveway Company Ltd | Construction | 2013 |
| New Fairfield Development Company Ltd | Administrative & support | 2016 |
| New Farmweald Limited | Agriculture & fishing | 2007 |
| New Ground Group Ltd | Manufacturing | 2018 |
| New Heritage Interiors Ltd | Construction | 2018 |
| New Home Improvement Group Limited | Construction | 2021 |
| New Internationalist Publications Limited | Information & communication | 1971 |
| New Leaf Garments Limited | Information & communication | 2025 |
| New Life Covenant Church UK Ltd | Other services | 2008 |
| New Lotus Food & Events Ltd | Hospitality | 2023 |
| New R Ltd | Administrative & support | 2026 |
| New Rise Solutions Ltd | Administrative & support | 2026 |
| New Road Innovations Ltd | Manufacturing | 2023 |
| New Stage Properties Limited | Real estate | 2022 |
| New Star Investments Limited | Other services | 2009 |
| New Startup Limited | Transport & logistics | 2025 |
| New Sun Hong Ltd | Hospitality | 2026 |
| New Witney Sushi Ltd | Manufacturing | 2024 |
| New Worcester Sushi Ltd | Wholesale & retail | 2023 |
| New Yorksway Limited | Real estate | 2009 |
| Newco Asia Ltd | Wholesale & retail | 2018 |
| Newells Barns Ltd | Construction | 2023 |
| Newman Cottages Limited | Real estate | 2009 |
| Neworbit Ltd. | Information & communication | 2003 |
| Newparts (Oxford) Ltd | Manufacturing | 2010 |
| Newrotex Limited | Professional & scientific | 2019 |
| News SOC Ltd | Extraterritorial | 2024 |
| Newspace Systems Limited | Professional & scientific | 2015 |
| Newstren Ltd | Professional & scientific | 2025 |
| Newtrim (UK) Ltd. | Manufacturing | 2001 |
| Nexa Energy Limited | Construction | 2024 |
| Nexgen Financial Consultants Ltd | Professional & scientific | 2018 |
| Nexium Solutions Limited | Administrative & support | 2007 |
| Next to Nothing Limited | Professional & scientific | 1986 |
| Next-Gen Renewable Technologies Ltd | Transport & logistics | 2025 |
| Nexta Group Ltd | Construction | 2004 |
| Nexta UK Group Ltd | Construction | 2024 |
| Nextgen Staffing Ltd | Administrative & support | 2025 |