| MVR Capital Limited | Financial services | 2024 |
| My Fire Safety Limited | Other services | 2012 |
| My Paradox Ltd | Wholesale & retail | 2021 |
| My Property Sourcer Ltd | Real estate | 2018 |
| My World Solar Ltd | Energy | 2022 |
| My-Gas Heating Services Ltd | Construction | 2017 |
| Myeb Ltd | Professional & scientific | 2018 |
| Myotech Global Limited | Administrative & support | 2026 |
| Myspace Limited | Real estate | 2017 |
| Myst Medical Ltd | Health & social care | 2025 |
| MYV Limited | Health & social care | 2023 |
| N E Corporation Ltd | Professional & scientific | 2011 |
| N H Medics Services Limited | Health & social care | 2014 |
| N Hardy Ltd | Construction | 2025 |
| N Horne Rigging Services Limited | Construction | 2017 |
| N K Fire Ltd | Construction | 2019 |
| N&J Entertainment Ltd | Arts & recreation | 2025 |
| N&R Investment Properties Limited | Real estate | 2026 |
| N. & C.Tyres and Exhausts Limited | Wholesale & retail | 1988 |
| N.N2 General Building Ltd | Construction | 2022 |
| N.R. Decorating Limited | Construction | 2004 |
| N22 Services Ltd | Information & communication | 2016 |
| Nadjaz Transport Ltd | Transport & logistics | 2022 |
| Nail Lounge ST Ltd | Other services | 2025 |
| Nails Lane House Residential Management Company Limited | Households | 1999 |
| Naima Media Limited | Information & communication | 2015 |
| Naked and Social LP | | 2011 |
| Namdet Ltd | Education | 2011 |
| Namesh Phoenix Solutions Ltd | Professional & scientific | 2026 |
| Nandini's Hair & Beauty Ltd | Other services | 2010 |
| Nanofcm Co., Ltd | Manufacturing | 2018 |
| Naomi Joy Todd Ltd | Arts & recreation | 2018 |
| Naphil Ltd | Education | 2013 |
| Narachelton Limited | Wholesale & retail | 2015 |
| Naremburn Accountancy Company Limited | Real estate | 2017 |
| NAS Trading Limited | Manufacturing | 2018 |
| NASH17 & Co Limited | Hospitality | 2017 |
| Nasir Healthcare Ltd | Health & social care | 2023 |
| Natasha Healthcare Services Ltd | Administrative & support | 2013 |
| Nathan Clark Utilities Ltd | Administrative & support | 2019 |
| National Filing Centre Limited | Professional & scientific | 2026 |
| National Harrow FC | Education | 2023 |
| National Neurological Rehabilitation Chambers Ltd | Health & social care | 2015 |
| National Specifications UK Limited | Professional & scientific | 2018 |
| Nationserv Ltd | Construction | 2014 |
| Nationserv Property Management Ltd | Real estate | 2021 |
| Natjay Homes Limited | Real estate | 2021 |
| Nautica Music Limited | Arts & recreation | 2021 |
| Navein Medical Ltd | Health & social care | 2025 |
| Nawaz Healthcare Limited | Health & social care | 2021 |
| Naylor Consultants Limited | Professional & scientific | 2022 |
| NAZ Kebab & Pizza Ltd | Hospitality | 2026 |
| NBZ Consulting Ltd | Information & communication | 2025 |
| NCH Consultancy (London) Limited | Administrative & support | 2019 |
| NCS Trinity Ltd | Financial services | 2026 |
| NDA Global (London) Ltd | Information & communication | 2026 |
| NDR Group Security Solutions Limited | Administrative & support | 2024 |
| Neate Digital Ltd | Administrative & support | 2022 |
| Neeyv Limited | Information & communication | 2015 |
| Negotium Ltd | Information & communication | 2020 |
| Neleh & Co Limited | Real estate | 2018 |
| Nelly FX Limited | Other services | 2020 |
| Nelson Aerospace Ltd | Manufacturing | 2019 |
| Neoteric Analysis Limited | Other services | 2019 |
| Neptune Engineering Co.Limited | Manufacturing | 1970 |
| Neptune Injection Europe Limited | Manufacturing | 2023 |
| Neptune Injection Limited | Manufacturing | 2021 |
| Nero Cultures Limited | Wholesale & retail | 2021 |
| Nest Searchers Limited | Real estate | 2018 |
| Netbrain Technologies, Limited | Information & communication | 2015 |
| Networknerds Ltd | Professional & scientific | 2025 |
| Neurocoach UK Ltd | Health & social care | 2024 |
| New Cambridge Accountants Limited | Other services | 2014 |
| New Cross Martial Arts Limited | Arts & recreation | 2013 |
| New Dawns Limited | Administrative & support | 2009 |
| New Day Christian CIC | Other services | 2026 |
| New Gate of India Restaurant Ltd | Hospitality | 2020 |
| New Hings Limited | Hospitality | 2022 |
| New Horizons Property & Probate Lawyers Limited | Professional & scientific | 2012 |
| New Vantage Consulting Limited | Professional & scientific | 2019 |
| New Ways Electrical Limited | Construction | 2015 |
| New World Takeaway Limited | Hospitality | 2023 |
| Newair Climate Solutions Ltd | Energy | 2023 |
| Newbould and Meredith Ltd | Other services | 2010 |
| Newco Buying Association | Wholesale & retail | 2006 |
| Newco London Ltd | Extraterritorial | 2003 |
| Newco Properties Ltd | Extraterritorial | 2003 |
| Newell Close Management Limited | Professional & scientific | 1994 |
| Newell Groundworks Limited | Construction | 2015 |
| Newland Gardens Management Company Ltd | Households | 2010 |
| Newrest Family Funerals Ltd | Other services | 2024 |
| Newsworthy Vision Limited | Information & communication | 2010 |
| Newton's Recruitment Limited | Administrative & support | 2014 |
| Nexa Studios Ltd | Information & communication | 2025 |
| Nexiv Consultancy Ltd | Information & communication | 2022 |
| Nexol Ltd | Professional & scientific | 2021 |
| Next GEN Homecare Ltd | Health & social care | 2025 |
| Next Goal Education CIC | Education | 2025 |
| NEXT4YOU Ltd | Wholesale & retail | 2014 |
| Nextgen Infrastructure Ltd | Information & communication | 2026 |