| Nest Estates Ltd | Real estate | 2025 |
| Nestaway Holidays Limited | Hospitality | 2020 |
| Neston Properties Limited | Real estate | 1958 |
| Netball Future Stars CIC | Education | 2025 |
| Neuromax Consulting Limited | Health & social care | 2024 |
| Nevella Ltd | Real estate | 2017 |
| New Care Holdings Limited | Financial services | 2019 |
| New Dawn Art & Motion Ltd | Professional & scientific | 2026 |
| New Happy View Ltd | Hospitality | 2024 |
| Newgate Mortgage Brokers Limited | Financial services | 2021 |
| Next Level Strength & Fitness Ltd | Arts & recreation | 2026 |
| Next Property Holding Company Limited | Financial services | 2023 |
| Ngis (Newgen Industrial Services) Ltd | Administrative & support | 2026 |
| Nicholas Flight Taxicabs Ltd | Transport & logistics | 2015 |
| Nicholson Care Ltd | Health & social care | 2014 |
| Nicolson Neurology Ltd | Health & social care | 2019 |
| NIK 77 Ltd | Transport & logistics | 2018 |
| Nilkanth Holdings Ltd | Financial services | 2025 |
| Nishlair Ltd | Real estate | 2016 |
| Nitro Adventure Ltd | Professional & scientific | 2010 |
| Nixar Logistics Ltd | Transport & logistics | 2020 |
| NJS Educational Services LLP | | 2024 |
| NK Dental Limited | Health & social care | 2026 |
| NK Future Investments Ltd | Health & social care | 2023 |
| NKA Property Investment Limited | Real estate | 2022 |
| NO 1 Best Food Limited | Wholesale & retail | 2025 |
| NO IT Ltd | Information & communication | 2015 |
| Noble Care Alliances Ltd | Health & social care | 2016 |
| Nohara Limited | Health & social care | 2024 |
| Noise Control Centre Limited | Construction | 2016 |
| Noiseair Ltd | Professional & scientific | 2015 |
| Nomorenash Ltd | Health & social care | 2023 |
| Noodle Performance Arts Franchise UK Ltd | Arts & recreation | 2016 |
| Noodle Performance Arts South Yorkshire LLP | | 2020 |
| Noopura Insight Imaging Ltd | Professional & scientific | 2026 |
| Nord Property Limited | Real estate | 2026 |
| Norhem United Ltd | Wholesale & retail | 2017 |
| Normal Good Ltd | Arts & recreation | 2024 |
| North by Northwest Neurology Limited | Health & social care | 2023 |
| North Wales Aero Forms Limited | Professional & scientific | 2023 |
| North West Cheshire Ltd | Real estate | 2024 |
| North West Surgical & Medicolegal Limited | Health & social care | 2010 |
| Northern Movement Ltd | Wholesale & retail | 2021 |
| Northern Wheels Limited | Wholesale & retail | 1998 |
| Northwest Leasing Ltd | Administrative & support | 2025 |
| Northwest Proactive Maintenance Limited | Administrative & support | 2016 |
| Northwest Psychology Consultants Limited | Health & social care | 2011 |
| Northwest Surgical Ltd | Financial services | 2024 |
| NOT Well Branded Limited | Administrative & support | 2020 |
| NP Lettings and Developments Ltd | Real estate | 2025 |
| Npico Limited | Financial services | 2012 |
| NRG Capital Holdings Ltd | Financial services | 2023 |
| NRG Freehold Co Ltd | Real estate | 2024 |
| NRG Freehold Co NO 2 Ltd | Real estate | 2025 |
| NRG Freehold Co NO 3 Ltd | Real estate | 2026 |
| NRG Lease Co Ltd | Real estate | 2024 |
| Nsofors Limited | Public administration | 2024 |
| Nuclei Consulting Limited | Information & communication | 2012 |
| Number 72 Ltd | Hospitality | 2024 |
| Nurturide Limited | Transport & logistics | 2025 |
| Nuwave Energy Services Limited | Energy | 2023 |
| NW Auto Services Limited | Wholesale & retail | 2012 |
| NW Beauty Ltd | Wholesale & retail | 2025 |
| NW Property Buyers Limited | Real estate | 2017 |
| NWA Inspection Services Ltd | Professional & scientific | 2026 |
| Nynas Naphthenics Limited | Wholesale & retail | 1989 |
| Nynssa Franchise Group Limited | Financial services | 2026 |
| Nynssa Jewellery Ltd | Wholesale & retail | 2026 |
| Nzero Group Limited | Financial services | 2016 |
| Oakham Berwing Ltd | Construction | 2020 |
| Oakwood Leisure Limited | Arts & recreation | 1986 |
| OAN Estates Ltd | Hospitality | 2025 |
| OB Dental Ltd | Health & social care | 2022 |
| OB Plumbing and Drainage Limited | Administrative & support | 2024 |
| Ocean Beach Tanning Studio Limited | Other services | 2017 |
| Ocean Sidings Limited | Real estate | 2025 |
| Octo Web Solutions Limited | Information & communication | 2025 |
| Oczkowski Ltd | Health & social care | 2022 |
| Offgriduk Ltd | Administrative & support | 2025 |
| Ogilby Wealth Management Limited | Financial services | 2019 |
| OH Dental (2023) Ltd | Health & social care | 2023 |
| Ohri Convenience Store Limited | Wholesale & retail | 2022 |
| Olti Construction Ltd | Construction | 2025 |
| Olympus Health and Fitness Ltd | Arts & recreation | 2024 |
| Omnia Semper Ltd | Information & communication | 2018 |
| Omran Orthodontics Ltd | Health & social care | 2024 |
| Omtek Global Limited | Professional & scientific | 2021 |
| One Two Soccer School Ltd | Education | 2023 |
| Onemediuk Ltd | Extraterritorial | 2011 |
| Onetoone Corporate Finance NW Ltd | Financial services | 2020 |
| Onlytans North West Limited | Wholesale & retail | 2023 |
| Onpoint Compliance Ltd | Professional & scientific | 2025 |
| Opalox Limited | Manufacturing | 2025 |
| Open Path Support Services Ltd | Health & social care | 2026 |
| OPH Malton Limited | Real estate | 2014 |
| Opheara Ltd | Manufacturing | 2023 |
| Optimal Dental Health Limited | Health & social care | 2024 |
| Optimum Services Ltd | Professional & scientific | 2004 |
| ORB Property Investment Ltd | Real estate | 2023 |
| Orbis Interactive Limited | Information & communication | 2004 |