| Nasseri & Co Trading Ltd | Wholesale & retail | 2022 |
| Natasha Jane Wood Limited | Other services | 2022 |
| Nationwide Promotions Ltd | Wholesale & retail | 2013 |
| Nationwide Warranties Limited | Financial services | 1982 |
| Natural Stone Paving Ltd | Construction | 2024 |
| Navesey General Engineers Limited | Manufacturing | 1974 |
| NB Performance Limited | Information & communication | 2024 |
| NC Reddy Ltd | Health & social care | 2016 |
| Nellie's Bacup Ltd | Hospitality | 2024 |
| Nelson Hall Associates Limited | Professional & scientific | 2013 |
| Nest Management NW Ltd | Households | 2025 |
| NET Academy (Northolme Estate Talent) Community Interest Company | Education | 2023 |
| Netherton EYE Centre Limited | Health & social care | 1996 |
| New Brighton Optical Ltd | Health & social care | 2011 |
| New Chapter Home Transformations Ltd | Construction | 2026 |
| New Hall Optical Limited | Wholesale & retail | 1998 |
| Newbroad Mortgages Limited | Financial services | 2002 |
| Newrad Associates Limited | Construction | 2025 |
| Next Stone Development Ltd | Wholesale & retail | 2025 |
| Nexus Maintenance Ltd | Construction | 2016 |
| Nexus Storage Solutions Ltd | Administrative & support | 2017 |
| Nexus Supply Limited | Wholesale & retail | 2025 |
| Nexvision Consulting Limited | Professional & scientific | 2024 |
| NI Hearing Solutions Ltd | Wholesale & retail | 2020 |
| Niall O’Kane Optical Limited | Wholesale & retail | 2024 |
| Nick Edge (APH) Limited | Financial services | 2021 |
| Nicola Fenner Limited | Health & social care | 1996 |
| NJ Locums Ltd | Administrative & support | 2024 |
| NO 1 Caravan Buyers UK Ltd | Wholesale & retail | 2023 |
| NO 39 Kebab & Pizza House (Darwen) Ltd | Administrative & support | 2017 |
| Nomad Clothing and Lifestyle Limited | Wholesale & retail | 2018 |
| Nomadic Mechanics Limited | Wholesale & retail | 2024 |
| Norman Prince Ascot Limited | Wholesale & retail | 2021 |
| Norman Prince Ashford and Teddington Limited | Wholesale & retail | 2021 |
| Norman Prince Crowthorne Limited | Wholesale & retail | 2021 |
| North Star Food and Dairy Process Engineers Limited | | 1980 |
| North Stone Paving Ltd | Construction | 2013 |
| North West Tipper Hire Limited | | 1990 |
| Northcott Consulting Limited | Professional & scientific | 2024 |
| Northcott Security & Locksmith Solutions Ltd | Manufacturing | 2025 |
| Northern Box & Packaging Co. Limited | Manufacturing | 1972 |
| Northern Valkyrie Productions Ltd | Information & communication | 2026 |
| Northstar AI Consulting Ltd | Information & communication | 2025 |
| Northwest Double Glazing Ltd | Construction | 2024 |
| Norville & Dobinson Limited | Wholesale & retail | 2020 |
| Norville Bath Road Limited | Wholesale & retail | 2021 |
| Norville Keynsham Limited | Wholesale & retail | 2021 |
| Norville Retail Limited | Wholesale & retail | 2019 |
| Norville Stonehouse Limited | Wholesale & retail | 2021 |
| NP Family Investments Limited | Real estate | 2025 |
| NR Invest-Uk Limited | Financial services | 2021 |
| NTB Survey Ltd | Professional & scientific | 2020 |
| Nuclear Quality Services Limited | Professional & scientific | 2019 |
| Number 1 Coffee Shop Community Hub CIC | Hospitality | 2025 |
| Numetric Accountancy Solutions Ltd | Professional & scientific | 2021 |
| Numetric Investment Group Ltd | Financial services | 2024 |
| Numetric Property Investments Ltd | Real estate | 2022 |
| Nutritious Minds Limited | Health & social care | 2025 |
| Nuts Group Limited | Manufacturing | 2019 |
| NWA Property Management Services Ltd | Households | 2025 |
| NXA Group Limited | Wholesale & retail | 2021 |
| O'Brien FEY Optical Limited | Wholesale & retail | 2024 |
| Oakway Associates Ltd | Extraterritorial | 2002 |
| Oatley Resources Limited | Wholesale & retail | 2012 |
| Observatory Limited | Wholesale & retail | 1998 |
| Observatory Optical Limited | Wholesale & retail | 2006 |
| Observatory Support Services Limited | Administrative & support | 2013 |
| Ocean Palace Restaurant Ltd | Hospitality | 2003 |
| Offload Northwest CIC | Health & social care | 2024 |
| Offshore Rebates Ltd | Professional & scientific | 2016 |
| Olive Bar Darwen Limited | Hospitality | 2021 |
| Olive Estates Limited | Real estate | 2005 |
| OMB AP Ltd | Health & social care | 2018 |
| ON Board Surface Mount Assembly Limited | Manufacturing | 2002 |
| One Horizon Limited | Professional & scientific | 2022 |
| One Physique Coaching Ltd | Health & social care | 2023 |
| One World Travel Sales & Marketing Limited | Administrative & support | 2016 |
| Onfurs Limited | Wholesale & retail | 2025 |
| Onyx Electrical (NW) Ltd | Construction | 2022 |
| Optiglaze Limited | Wholesale & retail | 2004 |
| Optima (Exeter) Ltd. | Health & social care | 1997 |
| Optima (Exeter) Properties Limited | Professional & scientific | 2023 |
| Optima (Faversham) Limited | Wholesale & retail | 2021 |
| Optimum Cleaning Solutions Ltd | Administrative & support | 2025 |
| Optivend Ltd | Wholesale & retail | 2026 |
| Opus Building Design and Surveying Limited | Professional & scientific | 2009 |
| OQ Eyewear (Stoke Newington) Ltd | Wholesale & retail | 2024 |
| OQ Eyewear (UK) Limited | Wholesale & retail | 2021 |
| Orion Hire Ltd | Administrative & support | 2025 |
| Osborne Harle Ltd | Wholesale & retail | 2011 |
| Osborne Tgps Ltd | Real estate | 2026 |
| Osmond Drake Optical Limited | Wholesale & retail | 2023 |
| Outlook Eyecare Ltd | Health & social care | 2013 |
| Outwork Studio Ltd | Professional & scientific | 2019 |
| Overseas Pakistani Citizens Organisation Ltd | Health & social care | 2013 |
| Owmer Ltd | Administrative & support | 2024 |
| Ozii Platforms Ltd | Information & communication | 2026 |
| P & a Eyecare (Marchmont) Limited | Wholesale & retail | 2023 |
| P & a Morgan Optical Limited | Wholesale & retail | 2021 |
| P Crabtree Developments Limited | Construction | 2016 |