| My Future Healthcare Ltd | Professional & scientific | 2024 |
| My IT Sorted Limited | Information & communication | 2015 |
| My Orders Ltd | Information & communication | 2016 |
| Myclosure Ltd | Information & communication | 2025 |
| Mydent Ltd | Health & social care | 2025 |
| Myolise Ltd | Administrative & support | 2017 |
| N J H Electrical Engineering Limited | Administrative & support | 2010 |
| N L Engineering Services Ltd. | Construction | 1998 |
| N Moran Group Limited | Financial services | 2023 |
| N T D Nails and Beauty Limited | Other services | 2026 |
| N&Y Solutions Ltd | Construction | 2019 |
| N-Gage Learning Group CIC | Other services | 2023 |
| N.A. Roberts Agricultural Limited | Administrative & support | 2003 |
| N.S.G. Exports Limited | Wholesale & retail | 1971 |
| Nace International Limited | Financial services | 2017 |
| Nadine Baggott Limited | Professional & scientific | 2017 |
| Naheed Properties Ltd | Households | 2021 |
| NAM Traders Ltd | Wholesale & retail | 2022 |
| Napier Property Developments Limited | Construction | 2008 |
| Naraland Ltd | Wholesale & retail | 2025 |
| Narmani Ltd | Professional & scientific | 2016 |
| Narora Solutions Limited | Wholesale & retail | 2025 |
| Nasri Supported Services Ltd | Health & social care | 2025 |
| Natalie Weavers Interiors Limited | Arts & recreation | 2015 |
| Nathan White Wealth Management Ltd | Financial services | 2025 |
| Nationwide Parking Control Ltd | Administrative & support | 2024 |
| Natrium Limited | Information & communication | 2003 |
| Natural Kids Ltd | Wholesale & retail | 2024 |
| Nature's Choice Catering Greengrocers Limited | Wholesale & retail | 2004 |
| Nautilus Blue Guarantee Company Limited | Financial services | 2024 |
| Nawal Properties Ltd | Households | 2021 |
| NAZ Enterprises (Richmond) Ltd | Hospitality | 2017 |
| NBL Property Solutions Limited | Real estate | 2024 |
| NCM Consultancy Limited | Professional & scientific | 2011 |
| Neil Quick Consulting Ltd | Professional & scientific | 2021 |
| Neptune Hotels Limited | Hospitality | 1999 |
| Nerus Consulting Limited | Professional & scientific | 2019 |
| Nesta Consulting Ltd | Professional & scientific | 2011 |
| Nestl Studio Ltd | Professional & scientific | 2025 |
| Nestler Limited | Real estate | 2024 |
| Nestvid Limited | Information & communication | 2024 |
| NET Zero Transformation Limited | Professional & scientific | 2025 |
| Netclearance Systems Emea Limited | Information & communication | 2015 |
| Nethaven Limited | Households | 1997 |
| Netspeed Limited | Professional & scientific | 2020 |
| Neurodiverse Community CIC | Administrative & support | 2023 |
| Neuroimaging Clinics Limited | Health & social care | 2018 |
| Neutral Studio Ltd | Professional & scientific | 2022 |
| Neville Ness House Ltd | Information & communication | 2011 |
| New Adventures Limited | Arts & recreation | 2001 |
| New Adventures Services Limited | Arts & recreation | 2004 |
| New Africa Partners Ltd | Professional & scientific | 2025 |
| New BAE Ltd | Hospitality | 2021 |
| New ERA Chefs Creating Limited | Hospitality | 2020 |
| New ERA Chefs Limited | Hospitality | 2020 |
| New Life Mexico Ltd. | Extraterritorial | 2015 |
| New Story Studio Limited | Professional & scientific | 2014 |
| New Thinkers - 21ST Century CIC | Information & communication | 2026 |
| New Vision Sports Group Limited | Arts & recreation | 2019 |
| Newdawn Publishing Limited | Information & communication | 2012 |
| Newforest Laundry & Linen Hire Ltd | Other services | 2018 |
| Newington Management Consultancy Ltd | Manufacturing | 2006 |
| Newlonist Ltd | Wholesale & retail | 2019 |
| Newport Group (Holdings) Limited | Professional & scientific | 2003 |
| Newport Industries Limited | Wholesale & retail | 1997 |
| Newroc Ltd | Financial services | 2003 |
| Next Number Games Limited | Information & communication | 2011 |
| Nextorigin Limited | Hospitality | 2025 |
| Nexus Building Automation Ltd | Construction | 2026 |
| NG Therapeutics Ltd | Manufacturing | 2024 |
| Nian Limited | Professional & scientific | 2023 |
| Niblett Consulting Limited | Professional & scientific | 2013 |
| Niccolo Antonietti Limited | Information & communication | 2014 |
| Niche Science & Technology Limited | Professional & scientific | 1998 |
| Nichol Advisory Ltd | Professional & scientific | 2026 |
| Nicholas Bentley Limited | Arts & recreation | 1994 |
| Nicholas Perks Ltd | Hospitality | 2025 |
| Nicholson Espana Limited | Information & communication | 2011 |
| Nick Baird Consulting Ltd | Professional & scientific | 2023 |
| Nick Grace Management Limited | Arts & recreation | 1986 |
| Nick Knight Photography Limited | Professional & scientific | 2011 |
| Nick Young & Company Limited | Real estate | 2014 |
| Nicol Trading Limited | Administrative & support | 2014 |
| Nightingale Developments Limited | Construction | 1964 |
| Nightingale Homes Limited | Construction | 1973 |
| Niko Installations Ltd | Construction | 2020 |
| NIL Illegitemi Carborundum Holdings Limited | Professional & scientific | 2019 |
| Nima (Malden) Limited | Wholesale & retail | 1969 |
| Nimblenet Solutions Ltd | Information & communication | 2024 |
| Ninja Kitten Productions Ltd | Information & communication | 2013 |
| Ninja Kitten Properties Ltd | Real estate | 2024 |
| Nizavis Ventures Ltd | Financial services | 2023 |
| NJR Standby Services Ltd | Other services | 2025 |
| NJS TM Ltd | Construction | 2020 |
| NK Active Limited | Education | 2021 |
| NK Image Limited | Professional & scientific | 1997 |
| NLA Advisory Ltd | Professional & scientific | 2025 |
| NLS Contracts Limited | Construction | 2009 |
| NMD Construction Ltd | Construction | 2021 |
| NMD Investments Ltd | Real estate | 2024 |