| Nudj Technologies Limited | Information & communication | 2023 |
| Nueve Ltd | Real estate | 2025 |
| Nugen Engineering Ltd | Manufacturing | 1999 |
| Nugent Grove Ltd | Real estate | 2022 |
| NUH Electronic Ltd | Wholesale & retail | 2026 |
| Nullcopy Limited | Administrative & support | 2022 |
| Number Plate Clinic Ltd | Wholesale & retail | 2020 |
| Number Plate Clinic NW Ltd | Wholesale & retail | 2026 |
| Number Plate Genie Limited | Other services | 2022 |
| Numerit Limited | Professional & scientific | 2010 |
| Numero Sense Limited | Professional & scientific | 2012 |
| Numitech Ltd | Wholesale & retail | 2025 |
| NUR Clinical Aesthetics UK Ltd | Health & social care | 2026 |
| NUR Law Limited | Professional & scientific | 2024 |
| Nurah Foundation | Other services | 2023 |
| Nurture (Marple) Limited | Education | 2012 |
| Nurturing Properties Ltd | Real estate | 2025 |
| Nurturing Souls Care Ltd | Health & social care | 2024 |
| NUT Street Garage Limited | Wholesale & retail | 2024 |
| Nutri Bar Limited | Wholesale & retail | 2014 |
| Nutri X Ltd | Wholesale & retail | 2024 |
| Nutricia Health & Beauty International Ltd | Manufacturing | 2025 |
| Nutrilawn Ltd | Other services | 2022 |
| Nutrilocker Superfoods Limited | Wholesale & retail | 2024 |
| Nuttalls Confectioners Limited | Wholesale & retail | 2003 |
| NVG Engineering Ltd | Professional & scientific | 2014 |
| NVM Property Ltd | Real estate | 2020 |
| NW Bolton Bakery Ltd | Manufacturing | 2026 |
| NW Cosmetic Auto Repairs Ltd | Wholesale & retail | 2023 |
| NW Event Services Ltd | Administrative & support | 2002 |
| NW Management Limited | Real estate | 2025 |
| NW Motors 365 Ltd | Wholesale & retail | 2026 |
| NW Pitch Maintenance Ltd | Arts & recreation | 2019 |
| NW Property Partners Ltd | Real estate | 2025 |
| NW Property Services Ltd | Real estate | 2026 |
| NW Real Estate Limited | Real estate | 2017 |
| NW Snagging Services (UK) Ltd | Wholesale & retail | 2026 |
| NW Turf & Garden Supplies Limited | Wholesale & retail | 2004 |
| NWB Prime Properties Group Ltd | Real estate | 2024 |
| NWC Information Design Limited | Professional & scientific | 2018 |
| NWC Investco Ltd | Financial services | 2025 |
| Nwce Holdings Limited | Financial services | 2021 |
| Nwims Communications Ltd | Information & communication | 2014 |
| Nwims IT Support Ltd | Information & communication | 2014 |
| Nxg.T Ltd | Wholesale & retail | 2015 |
| Nxtxgen Limited | Wholesale & retail | 2024 |
| NYA Investment Ltd | Real estate | 2020 |
| Nyama Choma Limited | Hospitality | 2024 |
| Nyas Developments Limited | Real estate | 2022 |
| Nyko Limited | Information & communication | 2022 |
| Nymkd Limited | Health & social care | 2026 |
| Nypy Holdings Ltd | Real estate | 2025 |
| Nyta Consulting Ltd | Professional & scientific | 2022 |
| NYZ Enterprises Limited | Administrative & support | 2015 |
| NØR Black Ltd | Wholesale & retail | 2025 |
| O & H Transport Limited | Transport & logistics | 2025 |
| O Lamar Limited | Professional & scientific | 2024 |
| O&L Group Ltd | Financial services | 2023 |
| O'Briens Butcher & Deli Ltd | Wholesale & retail | 2026 |
| O'Neill Health Limited | Other services | 2021 |
| O'Rourke Holdings Ltd | Financial services | 2018 |
| O.K. Legacy Group Limited | Information & communication | 2025 |
| O.M.R Civils Limited | Construction | 2025 |
| O.S. Fabrications Limited | | 2009 |
| O.T Homes Ltd | Real estate | 2024 |
| O24X Ltd | Other services | 2023 |
| OA (83) Holdings Ltd | Financial services | 2026 |
| Oak & Ribbon Limited | Administrative & support | 2008 |
| Oak & Stone Property Investments Ltd | Real estate | 2020 |
| Oakcode Ltd | Information & communication | 2019 |
| Oakcrest Care Ltd | Public administration | 2025 |
| Oakdale Technology Solutions Limited | Information & communication | 2025 |
| Oakdale Travel Ltd | Transport & logistics | 2020 |
| Oakfield Enterprises Limited | Wholesale & retail | 1993 |
| Oakfield Investment Management Company Limited | Administrative & support | 2007 |
| Oakgates Resident Association Limited | Other services | 1982 |
| Oakhill Hotel Holdings Limited | Financial services | 2022 |
| Oakhill Hotel Limited | Administrative & support | 2020 |
| Oakland Projects Limited | Construction | 2025 |
| Oaklands (Overdale Drive) Management Company Limited | Households | 2004 |
| Oaklands Guest House Limited | Hospitality | 2018 |
| Oakleaf Care Limited | Health & social care | 2008 |
| Oakley Commercial Management Limited | Professional & scientific | 2010 |
| Oakley Development Holdings Limited | Financial services | 2022 |
| Oakmont Group Ltd | Construction | 2024 |
| Oakmount Law Ltd | Administrative & support | 2015 |
| Oakridge Park Ltd | Construction | 2025 |
| Oakroyd Limited | Real estate | 2020 |
| Oaktek Limited | Professional & scientific | 2026 |
| Oakvale Services Limited | Manufacturing | 2025 |
| Oakville Properties Ltd | Real estate | 2019 |
| Oakwood Building and Joinery Ltd | Construction | 2021 |
| Oakwood Civils Ltd | Construction | 2026 |
| Oakwood Landscaping Services Limited | Administrative & support | 2006 |
| Oakwood Maintenance Services Ltd | Construction | 2022 |
| Oakwood Plastering Ltd | Construction | 2011 |
| Oakwood Properties North West Limited | Real estate | 2021 |
| Oakwood Tree Services (Bolton) Limited | Administrative & support | 2024 |
| Oakz Motorcycles Ltd | Wholesale & retail | 2024 |
| OAN Electrical Ltd | Construction | 2025 |