| NAR London Limited | Wholesale & retail | 2017 |
| Narates Technology Limited | Information & communication | 2023 |
| Nari Services Ltd | Construction | 2023 |
| Narrow Gate Investments UK Limited | Extraterritorial | 2012 |
| NAS Accounts Ltd | Professional & scientific | 2021 |
| NAS Consultancy Limited | Information & communication | 2025 |
| Nasarpco Ltd | Administrative & support | 2024 |
| Nash Accountancy Europe&Co Limited | Professional & scientific | 2018 |
| Nash Accountancy Limited | Professional & scientific | 2015 |
| Nash Accountancy UK & EU Ltd | Professional & scientific | 2023 |
| Nash.Acc Limited | Information & communication | 2020 |
| Nasir Limited | Other services | 2012 |
| NAT208 Limited | Other services | 2020 |
| Nata Today Ltd | Education | 2025 |
| Natalie Care Limited | Health & social care | 2024 |
| Natalie Collymore Ltd | Professional & scientific | 2021 |
| Natalie Mews Limited | Extraterritorial | 2018 |
| Natasha Scaife Limited | Professional & scientific | 2018 |
| Nate & SYL Limited | Professional & scientific | 2013 |
| Nate Properties Limited | Professional & scientific | 1980 |
| Natgab Care Services UK Ltd | Administrative & support | 2023 |
| Natgab Services Limited | Health & social care | 2012 |
| Natgabby Limited | Health & social care | 2024 |
| National Futsal Alliance Limited | Other services | 2022 |
| Nations Bible Chapel Ltd | Other services | 2026 |
| Nations Care Services Limited | Health & social care | 2023 |
| Nationwide Expert Services Limited | Health & social care | 2008 |
| Natlar Investments Limited | Real estate | 2001 |
| Natmagus Management LP | | 2014 |
| Natmiriam Healthcare Services Ltd | Health & social care | 2014 |
| Natto Limited | Information & communication | 2026 |
| Natua Ltd | Wholesale & retail | 2023 |
| Natural Beauty by DK Ltd | Other services | 2019 |
| Natural Crystal Rock Salt Ltd | Wholesale & retail | 2024 |
| Natural Health & Personal Wellness Ltd | Health & social care | 2013 |
| Naturalglambyliz Ltd | Other services | 2025 |
| Naturalis London Limited | Wholesale & retail | 2021 |
| Nature Nerds Ltd | Wholesale & retail | 2025 |
| Naughty Monkey Ltd | Wholesale & retail | 2023 |
| Navia Construction Ltd | Construction | 2019 |
| NAW Free Partnership LLP | | 2009 |
| Nayathnamira Limited | Hospitality | 2026 |
| Naysum Ltd | Wholesale & retail | 2026 |
| NAZ the Physio Ltd | Health & social care | 2023 |
| Nazz Hellim Ltd | Extraterritorial | 2019 |
| NB Accountants Limited | Professional & scientific | 2016 |
| NB Electrical Maintenance and Installation Services Ltd | Construction | 2021 |
| NBE Catering Equipment Services Ltd | Professional & scientific | 2022 |
| Nbsm Investments Ltd | Financial services | 2024 |
| NC3 Limited | Arts & recreation | 2022 |
| Ncdf UK Limited | Mining & quarrying | 2013 |
| NCK Properties Limited | Real estate | 2017 |
| Ndeleh Healthcare Ltd | Health & social care | 2021 |
| NDK Air Limited | Construction | 2010 |
| Neala Hickey Ltd | Professional & scientific | 2025 |
| Nealsy Limited | Other services | 2015 |
| Neat London Limited | Information & communication | 2016 |
| Neat Technologies Ltd | Information & communication | 2026 |
| Neath Port Talbot Nails Limited | Other services | 2025 |
| Neatresearch Laboratories Limited | Manufacturing | 2016 |
| Neatspace Cleaning Service Ltd | Administrative & support | 2025 |
| Neave Neuro Occupational Therapy Ltd | Health & social care | 2021 |
| NEC (London) Limited | Construction | 2008 |
| Neco Tantuni & Kunefe Limited | Hospitality | 2019 |
| Nedex Tech Ltd | Information & communication | 2024 |
| Nedricktinker Limited | Financial services | 2019 |
| Neema Group Ltd | Professional & scientific | 2026 |
| Nehme Commodities Limited | Financial services | 2014 |
| Nehthra Ltd | Real estate | 2020 |
| Neighbourhood Cleaning Services Ltd | Administrative & support | 2017 |
| Neighbourhood Estates Solutions Limited | Administrative & support | 2010 |
| Neighbourhood Insight Ltd | Professional & scientific | 2017 |
| Neilan Properties Ltd | Construction | 2024 |
| Neli&Damian Limited | Health & social care | 2018 |
| Nelson AI & Technology Consulting Ltd | Professional & scientific | 2022 |
| NEO Films Ltd | Information & communication | 2005 |
| NEO Link Labs Ltd | Information & communication | 2023 |
| NEO Van & Truck Hire Limited | Administrative & support | 2005 |
| Neo-Resonance and Coaching Ltd | Public administration | 2019 |
| Neodera AI Ltd | Information & communication | 2026 |
| Neon Halo Limited | Wholesale & retail | 2026 |
| Neon Mars UK Ltd | Wholesale & retail | 2023 |
| Neopositive Limited | Professional & scientific | 2017 |
| Neptune Construction and Engineering Limited | Construction | 2020 |
| Nerd Agency Ltd | Information & communication | 2014 |
| NES Financial Management Ltd | Professional & scientific | 2018 |
| NES Properties Ltd | Construction | 2020 |
| NEST28 Limited | Information & communication | 2026 |
| NET Tech Group Limited | Professional & scientific | 1994 |
| Netline Home Ltd | Wholesale & retail | 2022 |
| Netnov Ltd | Information & communication | 2024 |
| Netoch Medical Ltd | Health & social care | 2022 |
| Network Business Call Limited | Information & communication | 1998 |
| Network Finance Limited | Financial services | 1994 |
| Network Voice & Data Limited | Information & communication | 1982 |
| Neuroaroma Ltd | Manufacturing | 2024 |
| Neuroreader Ltd | Wholesale & retail | 2023 |
| Neurostrengths Ltd | Education | 2026 |
| Neville Partnership Limited | Financial services | 2013 |
| Nevzet Altinisik Ltd | Information & communication | 2021 |