| Neuron Controls Ltd | Construction | 2021 |
| Neuron Group Ltd | Financial services | 2025 |
| Neurossance Ltd | Information & communication | 2025 |
| Neurotechnics Limited | Wholesale & retail | 2018 |
| Nev's Ltd | Hospitality | 2026 |
| Never Settle Media Ltd | Information & communication | 2022 |
| New Horizons Hotel Ltd | Hospitality | 2013 |
| New Recruits Professional Services Limited | Administrative & support | 2009 |
| New Summit Projects Ltd | Real estate | 2025 |
| New Summit Properties Ltd | Real estate | 2025 |
| New Tradition Limited | Professional & scientific | 2010 |
| Newbottle Investments Limited | Financial services | 2018 |
| Newman Court (Oxford) Limited | Households | 2005 |
| Newman Event Services Limited | Administrative & support | 2014 |
| Newtier Group Limited | Manufacturing | 2022 |
| Newton Digital Ltd | Hospitality | 2014 |
| Newton Sewel Limited | Construction | 1983 |
| Nextgen Digital Solutions Limited | Wholesale & retail | 2025 |
| Nextmonth Ltd | Information & communication | 2025 |
| Nexus Pre-Construct Limited | Professional & scientific | 2025 |
| Nexvera Ltd | Wholesale & retail | 2026 |
| NGP VS Limited | Professional & scientific | 2023 |
| Ngsu Asset Management Limited | Administrative & support | 2012 |
| Nguni Ltd | Health & social care | 2022 |
| Nice Smart Repair Ltd | Wholesale & retail | 2019 |
| Nicedoors & Windows Ltd | Construction | 2015 |
| Nick Butler Kitchen Installations Limited | Construction | 2003 |
| Nick Henry Consulting Ltd | Professional & scientific | 2022 |
| Nick Trimmers Bus&Coach Ltd | Manufacturing | 2024 |
| Nick Westbury & Co. Limited | Professional & scientific | 1998 |
| Nickleby Design & Management Ltd | Administrative & support | 2015 |
| Nicolas&Alina Services Ltd | Transport & logistics | 2025 |
| NIKNO1719 Ltd | Construction | 2017 |
| Nikos Trade Limited | Wholesale & retail | 2019 |
| Nilays News Ltd | Wholesale & retail | 2015 |
| Nillergen Limited | Manufacturing | 2009 |
| Nina & Co. Ltd | Professional & scientific | 2011 |
| Ninety Three Interiors Ltd | Wholesale & retail | 2021 |
| Ninja Springs Limited | Manufacturing | 2021 |
| Ninthshot Ltd | Information & communication | 2024 |
| NJF Cleaning Limited | Administrative & support | 2014 |
| NJF Gritting and Grounds Maintenance Ltd | Administrative & support | 2020 |
| NJM Building Contractors Ltd | Construction | 2020 |
| Nj’S Healthcare Limited | Health & social care | 2026 |
| NKB Properties Limited | Households | 2021 |
| NKS Tyres (UK) Limited | Financial services | 2016 |
| NMR Accounting Solutions Ltd | Professional & scientific | 2023 |
| NO Name Events Limited | Extraterritorial | 2023 |
| NO Ordinary Gift Limited | Wholesale & retail | 2017 |
| Noahs ARK Painting Company Ltd | Other services | 2011 |
| Noble Mens Skincare Ltd | Extraterritorial | 2023 |
| Noblerose Ltd | Agriculture & fishing | 2024 |
| Noema Consulting Ltd | Professional & scientific | 2025 |
| Nolas Services UK Ltd | Manufacturing | 2003 |
| Noname Still Limited | Manufacturing | 2021 |
| Noodle Juice Ltd | Information & communication | 2020 |
| Noor’S Barbers Lounge Ltd | Other services | 2024 |
| Noral Way Management Company Limited | Real estate | 2017 |
| Noranho Ltd | Health & social care | 2024 |
| Norbar Limited | Extraterritorial | 2015 |
| Norbar Torque Tools (China) Limited | Professional & scientific | 2005 |
| Norbar Torque Tools Holdings Limited | Professional & scientific | 1999 |
| Norbar Torque Tools Limited | Manufacturing | 1943 |
| North and South Artists Limited | Arts & recreation | 2023 |
| North Bound Properties Ltd | Construction | 2023 |
| North Cotswold Autos Ltd | Wholesale & retail | 2025 |
| North END Strategy Limited | Professional & scientific | 2018 |
| North Oxfordshire Heating Limited | Construction | 2025 |
| North Oxon Electrical Ltd | Construction | 2019 |
| NORTH309 Limited | Construction | 2015 |
| Northants Taxi Ltd | Transport & logistics | 2019 |
| Northill Egham LLP | | 2021 |
| Northill Properties (Brockley) Limited | Real estate | 2013 |
| Northill Properties Limited | Real estate | 1996 |
| Northvale Korting Limited | Manufacturing | 1987 |
| Northvale Limited | Wholesale & retail | 2025 |
| Northvale Services Limited | Information & communication | 2008 |
| Northwood (Banbury) Limited | Real estate | 2015 |
| Norton Autohaus Ltd | Wholesale & retail | 2011 |
| Norton Park Properties Limited | Real estate | 2026 |
| Nosnod Security Systems Limited | Administrative & support | 2004 |
| NOT Normal Dogs Ltd | Hospitality | 2022 |
| NOT Really Limited | Health & social care | 2009 |
| Noumenia Ltd | Administrative & support | 2025 |
| Novel Mind Limited | Professional & scientific | 2023 |
| Novem Vitas Limited | Wholesale & retail | 2021 |
| Nowytrim Ltd | Administrative & support | 2025 |
| NP Cleaver Ltd | Professional & scientific | 2013 |
| NP Construction and Partners Limited | Construction | 2022 |
| NPH Property Group Ltd | Real estate | 2019 |
| NS Projects Heritage Consulting Limited | Professional & scientific | 2015 |
| NSP Ventures Ltd | Real estate | 2022 |
| Ntrust Engineering Ltd. | Professional & scientific | 2003 |
| Nurturing Rainbows Limited | Professional & scientific | 2023 |
| Nuvosky Limited | Information & communication | 2025 |
| Nuway Business Consulting Ltd | Professional & scientific | 2019 |
| NVL Autofix Ltd | Wholesale & retail | 2024 |
| NWP Systems Ltd | Financial services | 2025 |
| NYB Nutrition Ltd | Manufacturing | 2023 |
| O'Connor Holdings Group Limited | Financial services | 2025 |