| Neptuno Management Ltd | Administrative & support | 2019 |
| Nessen Ltd | Professional & scientific | 2024 |
| NET Impression Ltd | Real estate | 2019 |
| NET Zero Recruitment Ltd | Administrative & support | 2021 |
| Netcopter.Co.Uk Limited | Transport & logistics | 2000 |
| NETWORKS2GO Limited | Information & communication | 2008 |
| Networth IT Services Ltd | Information & communication | 2011 |
| Neurodivergent Perspectives Ltd | Health & social care | 2025 |
| New Regency Ltd | Real estate | 2021 |
| New Street Properties Ltd | Real estate | 2003 |
| Newman Industries Ltd | Wholesale & retail | 2022 |
| Nextgen Automation Limited | Other services | 2020 |
| NG Supplements Limited | Wholesale & retail | 2024 |
| Ngankwe Ltd | Wholesale & retail | 2025 |
| NIB Group Ltd | Information & communication | 2019 |
| Nice Associates Limited | Financial services | 2014 |
| Nice Sinclair Financial Services Ltd | Financial services | 2024 |
| Nicholas Austen Enterprises Limited | Other services | 2016 |
| Nicholas Austen Limited | Other services | 2015 |
| Nicol Lubrication Limited | Wholesale & retail | 1991 |
| Nigel Carr Enterprises Ltd | Information & communication | 2022 |
| Nimbusblu Ltd | Information & communication | 2021 |
| Nine Body & Mind Limited | Professional & scientific | 2011 |
| Niokem Limited | Wholesale & retail | 2010 |
| Niovest Limited | Financial services | 2018 |
| Nixons Knacker &Livestock Haulage Ltd | Agriculture & fishing | 2025 |
| NJM Property Management Limited | Hospitality | 2014 |
| Nkcafe Ltd | Hospitality | 2024 |
| NO Filter Needed Limited | Other services | 2017 |
| NO Problem Rail Ltd | Construction | 2018 |
| Noble Projects Limited | Construction | 2016 |
| Noon Sun Management Company Limited | Households | 2001 |
| Norkem Holdings PLC | Professional & scientific | 1987 |
| Norkem Limited | Wholesale & retail | 1973 |
| Norkem Minerals Limited | Wholesale & retail | 1986 |
| Norman House Management Limited | Households | 1988 |
| North Star Coaching Limited | Education | 2017 |
| North Star Dental Group Limited | Health & social care | 2025 |
| North West Commercial Cleans Limited | Administrative & support | 2023 |
| North West Land and Property Consultancy Ltd | Real estate | 2019 |
| Northern Group Properties (1) Ltd | Real estate | 2018 |
| Northern Group Properties (2) Ltd | Real estate | 2018 |
| Northern Group Properties (3) Ltd | Real estate | 2018 |
| Northern Group Properties (4) Ltd | Hospitality | 2024 |
| Northern Light Marketing Limited | Professional & scientific | 2011 |
| Northern Powerhouse Transport Limited | Transport & logistics | 2019 |
| Northern Property (DM) Ltd | Real estate | 2020 |
| Northpoint Developments (NO 1) Ltd | Real estate | 1987 |
| Norwest Foods International Group Limited | Professional & scientific | 2014 |
| Norwest Foods International Holdings Limited | Financial services | 2025 |
| Norwest Foods International Limited | Administrative & support | 1998 |
| Norwest Properties (Cheshire) Limited | Real estate | 2001 |
| NOT a Box Limited | Construction | 2014 |
| Novapol Limited | | 1988 |
| Novare Consulting Limited | Information & communication | 2002 |
| NSB Promotions Ltd | Arts & recreation | 2025 |
| NSC 2022 Holdings Ltd | Financial services | 2022 |
| Nscale Drift II Holdings Ltd | Financial services | 2025 |
| Nscale Global Holdings Limited | Financial services | 2024 |
| Nscale Operations (UK) Limited | Information & communication | 2025 |
| Nscale Services UK Ltd | Information & communication | 2025 |
| Ntwk App Ltd | Administrative & support | 2025 |
| NU Aesthetics Limited | Health & social care | 2019 |
| NU Facial Aesthetics Ltd | Other services | 2025 |
| Nufuture Recruitment Ltd | Administrative & support | 2019 |
| Nuorder Limited | Professional & scientific | 2004 |
| Nuovo Consulting Limited | Professional & scientific | 2020 |
| Nursery in a Box (UK) Limited | Information & communication | 2025 |
| Nutragy Limited | Professional & scientific | 2024 |
| Nutrifoods (UK) Ltd | Wholesale & retail | 2023 |
| Nxtep Personal Training Limited | Arts & recreation | 2019 |
| O and G Estates Ltd | Real estate | 2018 |
| Oak Cottage Ltd | Education | 2024 |
| Oak Leaf Facilities Management Ltd | Construction | 2018 |
| Oak Leaf FM Ltd | Construction | 2017 |
| Oak Tree Investments Ltd | Real estate | 2018 |
| Oak View Barn Management Company Limited | Households | 2022 |
| Oakfield Capital Limited | Financial services | 2017 |
| Oakfield Manor Estates Limited | Agriculture & fishing | 2010 |
| Obrienbikes Ltd | Manufacturing | 2026 |
| Obscurant Recruitment Solutions Ltd | Administrative & support | 2014 |
| Obsidian Assets Limited | Health & social care | 2004 |
| Ocean Reef Ltd | Real estate | 2015 |
| October House Ltd | Transport & logistics | 2017 |
| OFA Property Limited | Real estate | 2024 |
| Ogunquit Estates Limited | Construction | 1981 |
| OHA Home Ltd | Wholesale & retail | 2026 |
| OHM UK Limited | Extraterritorial | 2003 |
| Olive Construction Projects Ltd | Construction | 2014 |
| Oliver Hydcovalves Limited | Manufacturing | 2021 |
| Oliver Twinsafe Valves Limited | Manufacturing | 2000 |
| Ollerton Estates LLP | | 2006 |
| Ollerton Golf Centre Limited | Arts & recreation | 2019 |
| Ollerton Property Limited | Real estate | 2024 |
| Olms Accountants Ltd | Professional & scientific | 2026 |
| ON the Mountain Ltd | Arts & recreation | 2024 |
| One & Only Legal Limited | Professional & scientific | 2024 |
| One Key Skincare Limited | Wholesale & retail | 2025 |
| One Point Solution MCR Ltd | Transport & logistics | 2025 |
| One World Power Limited | Administrative & support | 2016 |