| NEM Developments Ltd | Real estate | 2024 |
| NEM Management Ltd | Administrative & support | 2025 |
| NEM PORTFOLIO1 Ltd | Real estate | 2024 |
| Neoniq Training Solutions Ltd | Education | 2021 |
| Nesfield Securities Limited | Construction | 1986 |
| Netherton Court Management Limited | Households | 1984 |
| Netherton House Management Limited | Households | 1984 |
| Netlinq UK Ltd | Information & communication | 2026 |
| NEU Pave Ltd | Construction | 2024 |
| New Inn Yeadon LS19 Ltd | Hospitality | 2024 |
| New Meridien Homes Limited | Construction | 2012 |
| New Road Aesthetics Limited | Health & social care | 2021 |
| Newholme Energy Limited | Construction | 2020 |
| Newholme Marketing Limited | Professional & scientific | 2024 |
| Newspace Properties Limited | Real estate | 2025 |
| Nexum Search Limited | Administrative & support | 2022 |
| NH Foods Limited | Wholesale & retail | 2004 |
| NHA Consulting Limited | Professional & scientific | 2023 |
| Niche Food and Drink Ltd | Hospitality | 2013 |
| Nicholl Property Investment Limited | Real estate | 2025 |
| Nicola Broughton Consulting Ltd | Professional & scientific | 2020 |
| Nicola Downes Consultancy Limited | Professional & scientific | 2020 |
| Nicola Jayne's Property Investments Ltd | Real estate | 2025 |
| Nidd Steel Buildings Ltd | Construction | 2017 |
| NIM (Leeds) Ltd | Hospitality | 2019 |
| NINEFIVE65 Limited | Professional & scientific | 2025 |
| Nineteen O Nine Ltd | Hospitality | 2018 |
| Ninety Plus Limited | Wholesale & retail | 2018 |
| NJR Investments (Holdings) Limited | Financial services | 2023 |
| Nmac Harrogate LLP | | 2010 |
| NO Assumptions Limited | Professional & scientific | 2016 |
| NO Pest Stations Limited | Wholesale & retail | 2026 |
| Nobu Statutory Limited | Financial services | 2022 |
| Nonly Limited | Extraterritorial | 2018 |
| Nonna's Cucina Ltd | Wholesale & retail | 2026 |
| Nook Cafe Bar Ltd | Hospitality | 2019 |
| Noovola Ltd | Information & communication | 2021 |
| Noozel Limited | Real estate | 2025 |
| Nora's Interiors & Gifts Limited | Wholesale & retail | 2019 |
| Nordika Design Limited | Wholesale & retail | 1997 |
| Norpak Limited | Manufacturing | 1981 |
| North Leeds Residential Limited | Construction | 2016 |
| North Lincs Mycology Limited | Agriculture & fishing | 2013 |
| North Lodge Investments Ltd | Real estate | 2017 |
| North Print Limited | Manufacturing | 2002 |
| North Star Information Governance Limited | Information & communication | 2025 |
| North Street Nook Limited | Real estate | 2025 |
| North Yorkshire Farm Produce Limited | Administrative & support | 2018 |
| Northern Apparel Limited | Extraterritorial | 2026 |
| Northern DIY Ltd | Wholesale & retail | 2022 |
| Northern Premier Solutions Ltd | Water & waste | 2024 |
| Northern Roofing (Leeds) Limited | Construction | 2023 |
| Northgate Verity Properties Ltd | Real estate | 2025 |
| Northguard Limited | Manufacturing | 2025 |
| Northstar Accounting Ltd | Professional & scientific | 2025 |
| Northway Preservation Limited | Construction | 2024 |
| Novosta Limited | Wholesale & retail | 2017 |
| Nrcv Holdings Ltd | Wholesale & retail | 2018 |
| NRG Recruitment Limited | Administrative & support | 2025 |
| Nscfo Limited | Professional & scientific | 2021 |
| Number 26 Holdings Limited | Financial services | 2016 |
| O & a Investments Ltd | Real estate | 2025 |
| O Plant Limited | Administrative & support | 2006 |
| O Sole MIO Port Solent Ltd | Hospitality | 2018 |
| O.J.Contracts York Ltd | Manufacturing | 2018 |
| Oakdene Ilkley Management Limited | Households | 2004 |
| Oakfield Consulting (Leeds) Limited | Professional & scientific | 2016 |
| Oakpath Advisory Limited | Professional & scientific | 2024 |
| Oaksmith Joinery Limited | Construction | 2025 |
| Oakstead Property Ltd | Real estate | 2025 |
| Oakstone Trustees Limited | Administrative & support | 2022 |
| Obito Pizzeria Ltd | Hospitality | 2026 |
| OBS Consulting Group Ltd | Professional & scientific | 2014 |
| OBS Property Group Ltd | Real estate | 2025 |
| Ocom Properties Ltd | Real estate | 2023 |
| October Town Entertainment Limited | Information & communication | 2019 |
| Octopi Property Limited | Real estate | 2022 |
| Octopi Trading Limited | Hospitality | 2022 |
| Offshoot Online Limited | Wholesale & retail | 2008 |
| Ognog Limited | Real estate | 2012 |
| Ohanahair Limited | Other services | 2010 |
| Old Glenaire Baildon (Management Company) Limited | Households | 2022 |
| Old Golf House Developments Limited | Real estate | 2010 |
| Old Quay Street Management Company Limited | Households | 1997 |
| Oldridge Consulting Ltd | Professional & scientific | 2026 |
| Olicana Consulting Limited | Information & communication | 2013 |
| Olicana Estates Limited | Real estate | 2016 |
| Olicana Events CIC | Administrative & support | 2026 |
| Olicana Gymnastics Limited | Arts & recreation | 2024 |
| Olicana Healthcare Limited | Health & social care | 2022 |
| Olicana Holdings Limited | Real estate | 2005 |
| Olicana Homes Ltd | Construction | 2025 |
| Olicana Marketing Ltd | Professional & scientific | 2021 |
| Olicana Products Limited | Manufacturing | 1967 |
| Olicana Surveyors Limited | Professional & scientific | 2018 |
| Olicana UK Limited | Administrative & support | 2007 |
| Olicana-One Limited | Professional & scientific | 2014 |
| Olive Branch Therapy Ltd | Information & communication | 2017 |
| One Brodrick Drive Limited | Households | 2011 |
| One North Digital Ltd | Administrative & support | 2023 |