| Northwest Trade Services Ltd | Wholesale & retail | 2026 |
| Northwest Upvc and Roofing Services Limited | Construction | 2025 |
| Northwood Coachworks Limited | Wholesale & retail | 1998 |
| Norwich Cannes Ltd | Wholesale & retail | 2025 |
| Norwich Ruskin Ltd | Wholesale & retail | 2025 |
| Norwood House Developments Ltd | Construction | 2014 |
| Norwoods Hospitality Limited | Hospitality | 2020 |
| Norwyn Apartments Blackpool Limited | Hospitality | 2024 |
| Nostalgia by Mantra Limited | Arts & recreation | 2025 |
| Nostalgic Trading Cards Ltd | Wholesale & retail | 2023 |
| Notnou Limited | Wholesale & retail | 2024 |
| Notoire Ltd | Wholesale & retail | 2017 |
| Notorious Big Small Limited | Hospitality | 2026 |
| Notre Limited | Wholesale & retail | 2012 |
| Notyard Ltd | Information & communication | 2010 |
| Nourish Imports Ltd | Wholesale & retail | 2024 |
| Nousta Limited | Other services | 2014 |
| Nova Yachting Ltd | Extraterritorial | 2025 |
| Nova Consultants (North) Ltd | Professional & scientific | 2020 |
| Nova Convenience Stores Ltd | Wholesale & retail | 2026 |
| Nova JS Ltd | Professional & scientific | 2023 |
| Nova Mini Market Ltd | Wholesale & retail | 2024 |
| Nova Stained Glass Limited | Construction | 2003 |
| Nova Wash NW Limited | Wholesale & retail | 2025 |
| Novello Restaurants Limited | Hospitality | 2005 |
| Noviathan Limited | Information & communication | 2026 |
| Novus Rail Limited | Professional & scientific | 2001 |
| Nowhigh Limited | Real estate | 2017 |
| NP Projects NW Ltd | Construction | 2026 |
| NPM (Midlands) Limited | Construction | 2016 |
| NRB Retail Ltd | Wholesale & retail | 2017 |
| Nrcb Holdings Ltd | Extraterritorial | 2013 |
| Nrgize Entertainments Ltd | Construction | 2024 |
| NRN & Ajan Limited | Extraterritorial | 2015 |
| Nrsa Ltd | Construction | 2017 |
| NS UK Properties Limited | Real estate | 2024 |
| NSP Property Developments Limited | Construction | 2018 |
| NST Holdings Limited | Professional & scientific | 2007 |
| NST Transport Services Limited | Transport & logistics | 1995 |
| NST Travel Group Limited | Administrative & support | 1991 |
| NTR Properties Limited | Real estate | 2020 |
| NTS Morgan O'Sullivan Limited | Professional & scientific | 2002 |
| Nu-Voo Ltd | Information & communication | 2019 |
| Nuborn Supplies Limited | Wholesale & retail | 2025 |
| Nuclear Insights Limited | Professional & scientific | 2024 |
| Nucleo U.K. Limited | Information & communication | 2025 |
| Nudon Express Ltd | Hospitality | 2025 |
| Nugent Joiners & Builders Limited | Construction | 2020 |
| Nulli Secundus Bars Limited | Hospitality | 2013 |
| Number Four and Freemasons Ltd | Hospitality | 2024 |
| Number One Hotels (Holdings) Limited | Financial services | 2018 |
| Number One Hotels Limited | Hospitality | 2007 |
| Nuovo Law Limited | Financial services | 2016 |
| Nuovohousing Ltd | Real estate | 2022 |
| Nuraan Associates Ltd | Information & communication | 2011 |
| Nurturefy CIC | Construction | 2025 |
| Nuts and MAY Limited | Information & communication | 2006 |
| Nuve Energy Ltd | Administrative & support | 2017 |
| NV Beauty Ltd | Administrative & support | 2017 |
| NV Business Limited | Information & communication | 2012 |
| NVF Capital Professional Services Limited | Transport & logistics | 2022 |
| Nvfc Lettings Limited | Real estate | 2022 |
| NVP (Opco) Limited | Construction | 2024 |
| NVP Capital Ltd | Real estate | 2026 |
| NW Building & Developments Limited | Construction | 2026 |
| NW Business Limited | Professional & scientific | 2024 |
| NW Discounts Ltd | Wholesale & retail | 2025 |
| NW Horizons Ltd | Real estate | 2024 |
| NW Property Certification Ltd | Construction | 2026 |
| NW Property Group Ltd | Financial services | 2020 |
| NWA Marine Limited | Professional & scientific | 2013 |
| Nwes (Preston) Ltd | Other services | 2024 |
| NWS Property Limited | Construction | 2025 |
| Nxtgen Labs 24/7 Ltd | Wholesale & retail | 2022 |
| Nykvlad Transport Ltd | Transport & logistics | 2025 |
| O G P Holdings Ltd | Hospitality | 2002 |
| O H I Limited | Health & social care | 1998 |
| O Mcpheely Ltd | Information & communication | 2022 |
| O&H Wilson Brothers Limited | Wholesale & retail | 2019 |
| O'Connell & Bean (Mechanical & Electrical) Limited | Construction | 2003 |
| O'Hare Engineering Design Limited | Professional & scientific | 2017 |
| O'Ryans Groundworks and Landscaping Limited | Construction | 2021 |
| O3P Limited | Professional & scientific | 2016 |
| Oak & Stone Landscaping & Tree Services Ltd | Administrative & support | 2026 |
| Oak Electrical Services Ltd | Construction | 2018 |
| Oakbridge Business Services Ltd | Extraterritorial | 2019 |
| Oakdalewoods Ltd | Wholesale & retail | 2025 |
| Oakenspire CIC | Education | 2025 |
| Oaklea Hotel Ltd | Hospitality | 2022 |
| Oakleaf Carpentry Contractors Limited | Construction | 2015 |
| Oakmere Publications Limited | Information & communication | 2025 |
| Oakmont Partners Ltd | Real estate | 2016 |
| Oaktree Academy Centre Ltd | Education | 2024 |
| Oaktree Childcare Limited | Health & social care | 2016 |
| Oaktree Support Services Limited | Administrative & support | 2019 |
| Oakview Recoveries Limited | Professional & scientific | 2025 |
| Oakwood (Blackpool) Management Company Limited | Households | 1993 |
| Oakwood (Bricket Wood) Management Company Limited | Real estate | 2000 |
| Oakwood Property Services & Joinery (North West) Limited | Construction | 2018 |
| Oasis Apartments & Suites Limited | Hospitality | 2023 |