| North Valley Metal Co.(Colne)Limited | Manufacturing | 1966 |
| North Valley Plumbing & Bathrooms Ltd | Wholesale & retail | 2013 |
| North West Aerospace Alliance | Other services | 1995 |
| North West Car Hire and Sales Limited | Administrative & support | 2016 |
| North West Golf Series Limited | Arts & recreation | 2025 |
| Northern Grit Limited | Professional & scientific | 2021 |
| Northern Legacy Ltd | Hospitality | 2025 |
| Northern Marketing Services Limited | Wholesale & retail | 2009 |
| Northern Monkey Lytham Ltd | Hospitality | 2024 |
| Northern Relish Limited | Hospitality | 2014 |
| Northern Travel Ltd | Transport & logistics | 2020 |
| Northlight Industries Ltd | Real estate | 2022 |
| Northlight Management Company Limited | Real estate | 2016 |
| Northlight Recruitment Limited | Administrative & support | 2025 |
| Northpoint AI Partners Ltd | Professional & scientific | 2026 |
| Northwest Investment Group Ltd | Real estate | 2025 |
| Northwest Roofing Specialists Ltd | Construction | 2021 |
| Northwest Sales Ltd | Wholesale & retail | 2018 |
| Northwest Solar and Renewables Ltd | Construction | 2026 |
| Northwest Van Hire Ltd | Administrative & support | 2023 |
| Northwood (Preston) Ltd | Real estate | 2006 |
| Nostalgia Development Limited | Wholesale & retail | 2024 |
| Nourishing Minds Ltd | Health & social care | 2014 |
| Nova Universal UK Limited | Arts & recreation | 2017 |
| Novara Personnel Ltd | Administrative & support | 2025 |
| Novum Asset Group Limited | Real estate | 2026 |
| Novus Consultants Group Ltd | Professional & scientific | 2024 |
| Nowaq Consultants Ltd | Wholesale & retail | 2021 |
| Noyna Limited | Wholesale & retail | 2011 |
| NP Integrated Technology Ltd | Information & communication | 2012 |
| NP Joinery & Roofing Ltd | Construction | 2022 |
| NP Residential Properties Ltd | Households | 2025 |
| NPC Wealth Management Limited | Professional & scientific | 2020 |
| NPD Defence Limited | Professional & scientific | 2026 |
| NPD Studio Limited | Professional & scientific | 2026 |
| NPD X Limited | Financial services | 2026 |
| Npit Ltd | Construction | 2025 |
| Npitv Ltd | Other services | 2017 |
| NPM Bathrooms Ltd | Wholesale & retail | 2020 |
| NS11 Ltd | Transport & logistics | 2021 |
| Ntam Homes Ltd | Real estate | 2026 |
| NTO Enterprise Limited | Wholesale & retail | 2024 |
| NUA Lancashire Ltd | Health & social care | 2023 |
| Number 50 Catering Limited | Hospitality | 2021 |
| NVM Doors Limited | Extraterritorial | 2010 |
| NVM Solutions Limited | Manufacturing | 2016 |
| NVP Heating & Bathrooms Ltd | Wholesale & retail | 2019 |
| NW Engineering Design Services Ltd | Professional & scientific | 2022 |
| NW Handyman Ltd | Construction | 2025 |
| NW Vehicle Solutions Limited | Wholesale & retail | 2026 |
| NYE Bevan Consultants Ltd | Professional & scientific | 2024 |
| Nywd Inc Ltd | Wholesale & retail | 2025 |
| O & S Stores Ltd | Wholesale & retail | 2023 |
| Oakenshaw Holdings Ltd | Financial services | 2026 |
| Oakline Consulting Ltd | Information & communication | 2014 |
| ODP Services Ltd | Health & social care | 2022 |
| OFF Track Media Services Ltd | Professional & scientific | 2021 |
| Offshore Solutions (NE) Limited | Construction | 2017 |
| OFS International Ltd. | Wholesale & retail | 2001 |
| OFS Property Limited | Real estate | 2019 |
| OI Transport Ltd | Transport & logistics | 2023 |
| Ojaala Welfare Foundation | Other services | 2013 |
| OLA Burrito Ltd | Hospitality | 2025 |
| Oldheath Limited | Manufacturing | 2022 |
| Olea Ltd | Real estate | 2023 |
| Oliver's Locksmiths Ltd | Manufacturing | 2023 |
| Olivers AV Recruitment Limited | Administrative & support | 2024 |
| Olix Motors Limited | Wholesale & retail | 2022 |
| Olympia Clinic Ltd | Health & social care | 2011 |
| OM Services Ltd | Professional & scientific | 2020 |
| ON Rail Solutions Limited | Manufacturing | 2016 |
| ON the Beat Dance Limited | Arts & recreation | 2015 |
| Ondesign Creative Limited | Professional & scientific | 2017 |
| One Path Living CIC | Real estate | 2025 |
| One Pound Dessert Limited | Hospitality | 2023 |
| One Step Retail Ltd | Wholesale & retail | 2018 |
| One Stop Sports Management Limited | Professional & scientific | 2017 |
| ONE60 Group Ltd | Wholesale & retail | 2025 |
| ONE60 Investments Ltd | Financial services | 2026 |
| Onehd Tech Limited | Arts & recreation | 2025 |
| Opal Technologies Limited | Information & communication | 2024 |
| Opal Vine Consulting Limited | Professional & scientific | 2025 |
| Open Door Adventure Limited | Other services | 2015 |
| Optic Trends Ltd | Health & social care | 2022 |
| Optimal Path Consultants Ltd | Information & communication | 2023 |
| Optimum Performance Coach Limited | Professional & scientific | 2016 |
| Optimum Solutions Group Ltd | Information & communication | 2023 |
| Optimus Care Ltd | Health & social care | 2026 |
| Optimus Commercial Services (UK) Ltd | Administrative & support | 2014 |
| Option Hygiene Limited | Manufacturing | 1997 |
| Option Hygiene Properties Limited | Professional & scientific | 2005 |
| Optivance Group Limited | Professional & scientific | 2025 |
| Optocoach Ltd | Professional & scientific | 2019 |
| Orange Gate Property Ltd | Real estate | 2026 |
| Orbit Stock Limited | Wholesale & retail | 2025 |
| Orbitx Advertiser UK Ltd | Professional & scientific | 2024 |
| Orient Business Park Limited | Energy | 2012 |
| Oriental Pearl Tasty Food Ltd | Hospitality | 2025 |
| Orvia Enterprise Limited | Administrative & support | 2011 |
| Orvia Group Limited | Administrative & support | 2001 |