| Northwest Homecare Solutions Ltd | Construction | 2010 |
| Northwest Homes & Investments Ltd | Real estate | 2025 |
| Northwest Maintenance Group Ltd | Construction | 2026 |
| Northwest Management Solutions Ltd | Professional & scientific | 2003 |
| Northwest Mechanical & Electrical Ltd | Information & communication | 2025 |
| Northwest Property Partners Limited | Real estate | 2024 |
| Northwest Property Solutions Ltd | Real estate | 2017 |
| Northwest Supplies Direct Ltd | Wholesale & retail | 2022 |
| Northwest Vapours Ltd | Wholesale & retail | 2017 |
| Norton CAD Ltd | Professional & scientific | 2021 |
| NOT Just Care Ltd | Public administration | 2023 |
| Notably Good Ltd | Information & communication | 2009 |
| Notaeh Consultants Limited | Professional & scientific | 2008 |
| Notoriousmba Ltd | Professional & scientific | 2024 |
| Novalys | Professional & scientific | 2026 |
| Novarra Corporate Finance Ltd | Financial services | 2025 |
| Novarra Group Ltd | Extraterritorial | 2026 |
| Novarra Ltd | Extraterritorial | 2026 |
| Novaside Limited | Information & communication | 2024 |
| Novastar Homes Limited | Hospitality | 2026 |
| Novexis Express Ltd | Transport & logistics | 2026 |
| Novum Technologies Limited | Information & communication | 2025 |
| NOW NOT When Ltd | Professional & scientific | 2023 |
| Noxlync | Professional & scientific | 2023 |
| NPF Safety Services Limited | Professional & scientific | 2016 |
| Nporsdrive Ltd | Construction | 2016 |
| NR Barton Limited | Professional & scientific | 2018 |
| NR Topco Limited | Financial services | 2026 |
| Nrea Holdings Ltd | Real estate | 2017 |
| NRL (Holdings) Limited | Professional & scientific | 2014 |
| NRL NDT Services Limited | Construction | 2007 |
| NS O'Malley's Fine Finishes Ltd | Construction | 2026 |
| NS Surveys Ltd | Professional & scientific | 2013 |
| Nsaw Limited | Wholesale & retail | 2018 |
| Nsrm Property Ltd | Real estate | 2015 |
| NT Shan & Co Limited | Wholesale & retail | 2025 |
| Ntertain Events Ltd | Arts & recreation | 2014 |
| NTJ Interiors Ltd | Construction | 2024 |
| NU GEN Marketing Limited | Professional & scientific | 2020 |
| NU Homes Development Projects Limited | Construction | 2023 |
| NU Homes Groundworks Ltd | Construction | 2024 |
| NU Homes Ltd | Real estate | 2019 |
| NU Venture (Wigan) Ltd | Manufacturing | 2019 |
| NU Venture Leisure Homes Ltd | Manufacturing | 2026 |
| NU Venture Resales & Rentals Ltd | Wholesale & retail | 2021 |
| Nubirios | Professional & scientific | 2026 |
| Nubuild Maintenance Limited | Construction | 2021 |
| Nuclear Project Solutions Ltd | Professional & scientific | 2022 |
| Nudog Limited | Wholesale & retail | 2024 |
| Number One Finishes Limited | Construction | 2023 |
| Numerological Limited | Professional & scientific | 2006 |
| Numetrica Ltd | Information & communication | 2025 |
| Nuovo Sorrentos Restaurant&Bar Ltd | Hospitality | 2025 |
| Nurseryandm.E Ltd | Health & social care | 2021 |
| Nurturing Wisdom Ltd | Education | 2016 |
| Nutra Preps Ltd | Hospitality | 2021 |
| Nutriheal Online Ltd | Health & social care | 2019 |
| Nutriheal Training Ltd | Health & social care | 2016 |
| Nutrinela Holdings Limited | Professional & scientific | 2021 |
| Nutrinela Limited | Administrative & support | 2008 |
| Nutters Hair Company Limited | Other services | 2006 |
| Nuvenu Ltd | Administrative & support | 2014 |
| NV3 Property Services Limited | Administrative & support | 2013 |
| NVS Investments Ltd | Real estate | 2003 |
| NW Electrical Contractors Limited | Construction | 2009 |
| NW Fire & Security Limited | Construction | 2020 |
| NW Lead LAB Ltd | Professional & scientific | 2025 |
| NW Precision Finishing Limited | Manufacturing | 2017 |
| Nwsl Investments Limited | Financial services | 2025 |
| Nxtgen Heat Ltd | Construction | 2024 |
| Nyctea Aurea Ltd | Professional & scientific | 2026 |
| NYX Associates Ltd | Information & communication | 2022 |
| O D Lloyd Property Limited | Real estate | 2022 |
| O Duine Ltd | Manufacturing | 2017 |
| O'Brien & Noel Ltd | Real estate | 2025 |
| O'Brierry Limited | Construction | 2024 |
| O'Neill & Barton Limited | Professional & scientific | 2013 |
| O'Toole Risk Management Limited | Professional & scientific | 2008 |
| O'Tooles Commercials Limited | Wholesale & retail | 2023 |
| O.Key Ltd | Extraterritorial | 2020 |
| O.O.L. Property Limited | Arts & recreation | 2004 |
| O.U.A.T Limited | Health & social care | 2016 |
| OA Plumbing & Heating Ltd | Construction | 2025 |
| Oak Tree Services NW Ltd | Administrative & support | 2022 |
| Oak Tree Wigan Ltd | Wholesale & retail | 2026 |
| Oak Valley Tree Care Ltd | Administrative & support | 2026 |
| Oakbridge Alliance Ltd | Financial services | 2025 |
| Oakland Developments (Wigan) Limited | Construction | 2020 |
| Oaktree Law Limited | Professional & scientific | 2019 |
| OAO Legal Ltd | Professional & scientific | 2025 |
| Oasis Living Limited | Real estate | 2009 |
| OBA Koxo Ltd | Information & communication | 2024 |
| Obaski Ltd | Health & social care | 2023 |
| Obinani Holdings Ltd | Health & social care | 2026 |
| Oboost Marketing Limited | Construction | 2018 |
| Occasion Travel Ltd | Administrative & support | 2018 |
| OCD Clean & Clear Solutions Ltd | Administrative & support | 2021 |
| Ocean Rose Ltd | Manufacturing | 2025 |
| OCM Products Ltd | Manufacturing | 2015 |
| Octagon Communications Limited | Information & communication | 2002 |