| Myshaede Limited | Manufacturing | 2026 |
| Mystic ZOO Limited | Wholesale & retail | 2021 |
| Mythbreaker Limited | Other services | 2005 |
| Mzlm Ltd | Hospitality | 2013 |
| N Commerce Ltd | Wholesale & retail | 2022 |
| N.K.D. Enterprise Limited | Wholesale & retail | 1985 |
| Naeto Investment Ltd | Real estate | 2022 |
| Naglewood Limited | Professional & scientific | 2025 |
| Nails by C Boutique Ltd | Other services | 2024 |
| NAM Health Limited | Health & social care | 2021 |
| Namdiv Ltd | Real estate | 2020 |
| Nampara Wild Limited | Professional & scientific | 2018 |
| Napanzio Ltd | Hospitality | 2018 |
| Nardini 1988 Ltd | Professional & scientific | 2025 |
| Nash Road Property Development Ltd | Construction | 2019 |
| Nataris Limited | Information & communication | 2004 |
| Natifsource Limited | Information & communication | 2025 |
| Natiiv Limited | Administrative & support | 2022 |
| Nationwide Waste & Recycling Limited | Water & waste | 2008 |
| Natural Conversations Limited | Professional & scientific | 2022 |
| Naturalx Limited | Other services | 2017 |
| Nature Fresh Limited | Wholesale & retail | 2017 |
| Naturex Ltd | Wholesale & retail | 2025 |
| Naturous Limited | Wholesale & retail | 2025 |
| NAV Property Investments Ltd | Real estate | 2018 |
| Navarre Limited | Households | 1981 |
| Navsa Trading Ltd | Real estate | 2022 |
| NB Architects Ltd | Professional & scientific | 2020 |
| Nbjb Limited | Real estate | 2016 |
| NBT Developments Ltd | Construction | 2016 |
| NCH Electrical Contractors Limited | Construction | 2016 |
| NCW Services Ltd | Construction | 2024 |
| Ndmf Limited | Professional & scientific | 2026 |
| Neleco Ltd | Professional & scientific | 2019 |
| Nelton Shipping Ltd | Professional & scientific | 2011 |
| Nena G Studio Ltd | Other services | 2025 |
| Neoderma Pharma Limited | Manufacturing | 2022 |
| Neon Labs Surrey Ltd | Information & communication | 2025 |
| Nepean Communications Limited | Professional & scientific | 2018 |
| Nerla Ltd | Professional & scientific | 2021 |
| Nescot Enterprises Limited | Education | 1989 |
| Nescot Holdings Limited | Education | 1989 |
| Nesekai Limited | Information & communication | 2020 |
| Nestfields Ltd | Real estate | 2024 |
| Nestfields Realty Ltd | Real estate | 2025 |
| Nethercott Opticians Ltd | Wholesale & retail | 2019 |
| Neurodiversity Focus CIC | Arts & recreation | 2023 |
| Neurodiversity Training Academy Limited | Health & social care | 2024 |
| Neuroinclusive Support Services Ltd | Administrative & support | 2023 |
| Neurosoft Ltd. | Information & communication | 1997 |
| Neurospicy Futures CIC | Education | 2025 |
| Neurovantage Limited | Health & social care | 2025 |
| Neville Aerial Systems Limited | Construction | 1971 |
| Nevita Limited | Real estate | 2012 |
| New Advisory Ltd | Professional & scientific | 2024 |
| New Colebrooke Court Management Limited | Real estate | 1983 |
| New Comfort Limited | Construction | 2016 |
| New ERA Academy Training Limited | Health & social care | 2021 |
| New Future Services Ltd | Construction | 2023 |
| New Muirgate Properties Limited | Real estate | 1989 |
| New Orient Limited | Professional & scientific | 1999 |
| New Paws Ltd | Other services | 2021 |
| New Pine Limited | Professional & scientific | 2018 |
| New Residency Ltd | Administrative & support | 2021 |
| New Steam & Press Co. Ltd | Manufacturing | 2025 |
| New Tech Unbox Ltd | Information & communication | 2021 |
| New Wave Mortgage Solutions Limited | Professional & scientific | 2008 |
| New Yard Services Limited | Transport & logistics | 2017 |
| Newbold Search Limited | Professional & scientific | 2021 |
| Newoon Global Ltd | Professional & scientific | 2023 |
| Nexo Ventures Ltd | Professional & scientific | 2025 |
| Next Level Contracting Ltd | Construction | 2025 |
| Nextax Advisors and Consultants Ltd | Professional & scientific | 2023 |
| Nextgen Security Limited | Administrative & support | 2024 |
| Nextlive Ltd | Wholesale & retail | 2025 |
| Nextminute UK Limited | Information & communication | 2022 |
| Nextstep Builders Ltd | Construction | 2018 |
| Nexus Consulting Solutions Ltd | Information & communication | 2026 |
| Nexus Cowman Business Solutions Ltd | Information & communication | 2016 |
| Nexus Recruitment Solutions Limited | Administrative & support | 2024 |
| Neysan Group Ltd | Wholesale & retail | 2025 |
| NF3 Advisory Ltd | Professional & scientific | 2024 |
| NG Building Surveyors Ltd | Professional & scientific | 2021 |
| NG Surveyors Ltd | Professional & scientific | 2019 |
| Ngah Consultancy Limited | Administrative & support | 2013 |
| Ngbr Ltd | Construction | 2014 |
| NGC Surveyors Ltd | Professional & scientific | 2025 |
| Ngrp Ltd | Financial services | 2024 |
| Nibral Capital Ltd | Extraterritorial | 2017 |
| Nice and Clean London Ltd | Other services | 2011 |
| Nicholson Formwork Limited | Construction | 2015 |
| Nichy AI Ltd | Education | 2026 |
| Nick Parnell Limited | Professional & scientific | 2002 |
| Nick Phillis Associates Limited | Professional & scientific | 2015 |
| Nicola Todd Ltd. | Administrative & support | 2017 |
| Nicorus Ltd | Wholesale & retail | 2023 |
| Nigar Sultana Limited | Real estate | 2021 |
| Nightingale & Sentinel Limited | Information & communication | 2025 |
| NIK NAK Studio Ltd | Other services | 2024 |
| Niki-To Ltd | Construction | 2016 |