| New Image Car Sales Ltd | Wholesale & retail | 2023 |
| New Roots Herbal Limited | Wholesale & retail | 2004 |
| Newbu Limited | Professional & scientific | 2002 |
| Newenham Consulting Services Ltd | Professional & scientific | 2015 |
| Newman Transformation Limited | Professional & scientific | 2019 |
| Newport Road Management Company Limited | Households | 1988 |
| Newport Technologies Ltd | Professional & scientific | 2025 |
| Nexgen International | Professional & scientific | 2017 |
| Nexial Limited | Information & communication | 2011 |
| Nexilis Media Ltd | Information & communication | 2021 |
| Nexoon Ltd | Professional & scientific | 2023 |
| Next Leisure Limited | Professional & scientific | 2019 |
| Next Phase Consulting Limited | Information & communication | 2009 |
| Nextgen Cricket Ltd | Manufacturing | 2022 |
| Nextlead Solutions Ltd | Professional & scientific | 2026 |
| Ngeek Limited | Administrative & support | 2015 |
| NHB Recruitment Solutions Limited | Administrative & support | 2013 |
| Nibbs Spirits Limited | Manufacturing | 2018 |
| NIC Renn Limited | Professional & scientific | 2011 |
| Nicholls Property Services Limited | Construction | 2024 |
| Nick Lawton Ltd | Information & communication | 2013 |
| Nick Page Services Ltd | Financial services | 2012 |
| Nick Savill Consulting Limited | Information & communication | 2014 |
| Nicky Hayes Interiors Limited | Wholesale & retail | 2024 |
| Niedworks Limited | Professional & scientific | 2010 |
| Nigel Atkins Ceramics Ltd. | Construction | 2015 |
| Nigelsgb Ltd | Other services | 2014 |
| Nightingale Residents Association Limited | Households | 2007 |
| Nightshift Management Ltd | Professional & scientific | 2023 |
| Nilam Bola Limited | Professional & scientific | 2019 |
| Nimbus Rental Limited | Real estate | 2022 |
| NJA Projects Ltd | Financial services | 2016 |
| NJG Advisers Limited | Professional & scientific | 2013 |
| NJH Estates Ltd | Real estate | 2013 |
| NJH Property Management Limited | Real estate | 2014 |
| Njord Inc Ltd | Wholesale & retail | 2021 |
| NJT Consultants Limited | Professional & scientific | 2022 |
| NK Secure Solutions Ltd | Construction | 2023 |
| NLE Capital Limited | Real estate | 2024 |
| NLG Capital Limited | Financial services | 2025 |
| Nobbs Holding Company Limited | Financial services | 2025 |
| Noble IT Limited | Information & communication | 2022 |
| Nodl Ltd | Information & communication | 2019 |
| Nofa Auto Care Ltd | Wholesale & retail | 2024 |
| Nomad Traveller Limited | Other services | 2006 |
| Nonchalante Limited | Households | 2007 |
| Nonsuch Property Services Ltd | Real estate | 2000 |
| Norango Limited | Information & communication | 2010 |
| Nordic Semiconductor UK Limited | Professional & scientific | 2020 |
| Norman Wilson & Company Limited | Professional & scientific | 1985 |
| Norriskips and Waste Management Limited | Extraterritorial | 2013 |
| Northbanks Design Ltd | Professional & scientific | 2017 |
| Northbrook Investment Partners Ltd | Real estate | 2025 |
| Northcote Nest Ltd | Real estate | 2025 |
| Northwood Wealth Management Ltd | Financial services | 2016 |
| Norton Asset Management Ltd | Real estate | 2024 |
| Noughts and Croquettes Ltd | Manufacturing | 2020 |
| Nova Cranes Limited | Administrative & support | 2020 |
| Nowland International Limited | Professional & scientific | 2023 |
| Nowspeak Holdings Limited | Information & communication | 2019 |
| Nowspeak Technologies Limited | Information & communication | 2004 |
| NPC Films Ltd | Information & communication | 2015 |
| NRL Developments Limited | Construction | 2017 |
| NRT Carpentry Contractors Limited | Construction | 2016 |
| NS BIO Limited | Professional & scientific | 2023 |
| NS Dent Limited | Health & social care | 2022 |
| NS Systems Ltd | Information & communication | 2014 |
| Nspr (Holdings) Ltd | Financial services | 2021 |
| NU Flooring Ltd | Construction | 2018 |
| Nuhumun Solutions Ltd | Information & communication | 2018 |
| Number Ninety Seven Limited | Hospitality | 2013 |
| Numio Technology UK Ltd | Information & communication | 2016 |
| Nurture NOW Ltd | Health & social care | 2025 |
| Nutcroft Investments Limited | Extraterritorial | 2024 |
| Nuthatch Advisors Limited | Professional & scientific | 2017 |
| Nuthatch SNS Investments Limited | Real estate | 2019 |
| Nutrimente Ltd | Health & social care | 2023 |
| Nutshell Lane Management Company Limited | Other services | 1999 |
| Nuwright Limited | Information & communication | 2026 |
| Nuzeed Traders Ltd | Wholesale & retail | 2020 |
| NV Health Ltd | Health & social care | 2022 |
| NXT Digital Solutions Ltd | Information & communication | 2002 |
| Nyewood Industrial Estate Management Limited | Households | 1993 |
| Nyla's Transport Ltd | Transport & logistics | 2021 |
| O a M Group Holdings Limited | Financial services | 2026 |
| O Brotherhood Limited | Administrative & support | 2019 |
| O'Dell Property Management Limited | Administrative & support | 1980 |
| O'Keefe Scanlon Limited | Professional & scientific | 1993 |
| Oak Outdoor Limited | Real estate | 2013 |
| Oak Park Health Limited | Health & social care | 2020 |
| Oak Park Leisure Limited | Arts & recreation | 2003 |
| Oak Park Wellness Ltd | Other services | 2024 |
| Oakes Court (Hungerford) Management Company Limited | Households | 1995 |
| Oakesfield Arford Limited | Construction | 2024 |
| Oakesfield Construction Limited | Construction | 2023 |
| Oakesfield Farnham Limited | Construction | 2024 |
| Oakesfield Homes Limited | Construction | 2025 |
| Oakesfield Limited | Construction | 2019 |
| Oakesfield Planning and Estates Limited | Real estate | 2020 |
| Oaklands Animal Feeds Limited | Agriculture & fishing | 2012 |