| MW Property Holdings Limited | Real estate | 2017 |
| MW Sales Limited | Other services | 2014 |
| MWN Property Management Limited | Real estate | 2024 |
| MWP Advice Limited | Administrative & support | 2013 |
| MWT Architecture Ltd | Professional & scientific | 2020 |
| MWT Construction Limited | Construction | 2002 |
| MWZ (Bucks) Limited | Transport & logistics | 2025 |
| My Baby Socks Limited | Wholesale & retail | 2018 |
| My Broadcast Ltd | Information & communication | 2024 |
| My Business Coach App Ltd | Information & communication | 2026 |
| My Fit POD Franchise Ltd | Other services | 2023 |
| My Fit POD Ltd | Arts & recreation | 2021 |
| My Home From Home Ltd | Administrative & support | 2022 |
| My Hygienist Limited | Health & social care | 2022 |
| My KIT Room Limited | Information & communication | 2024 |
| My Little Green Space Limited | Administrative & support | 2021 |
| My Mate Management Ltd | Professional & scientific | 2023 |
| My Music POD Ltd | Extraterritorial | 2025 |
| My Neuro Hub Ltd | Health & social care | 2025 |
| My Own Style Limited | Wholesale & retail | 2024 |
| My Payroll Options Limited | Administrative & support | 2018 |
| My Tax Technologist Ltd | Information & communication | 2025 |
| My Tech Services Ltd | Information & communication | 2019 |
| My Value Mart Limited | Wholesale & retail | 2025 |
| Mycareprovider Ltd | Health & social care | 2025 |
| Mycashmanagement Limited | Professional & scientific | 2003 |
| Mycaso Events Ltd | Hospitality | 2015 |
| Mycovey Ltd | Information & communication | 2026 |
| Myers Davison Ginger Holdings Limited | Financial services | 2025 |
| Myers Davison Ginger Limited | Financial services | 2003 |
| Myfutureself Matters Limited | Education | 2021 |
| Mygreenkeeper Ltd | Administrative & support | 2013 |
| Mylashis Ltd | Administrative & support | 2017 |
| Mylaw Financial Consulatnts Ltd | Professional & scientific | 2018 |
| Mylaw Online Enterprise Ltd | Wholesale & retail | 2019 |
| Mylaw Promotion Ltd | Real estate | 2022 |
| Myob Services Limited | Information & communication | 2023 |
| Myplan Consultancy Services Ltd | Education | 2025 |
| Myrady & Crys Ltd | Wholesale & retail | 2022 |
| Myselfology Ltd | Health & social care | 2024 |
| Mythsmyth Ltd | Information & communication | 2023 |
| MZ Pro Trading Limited | Wholesale & retail | 2024 |
| N & K Property Management Ltd | Real estate | 2024 |
| N D M Ltd | Professional & scientific | 2005 |
| N G Maintenance Limited | Construction | 2019 |
| N Hanson Farming Limited | Agriculture & fishing | 2011 |
| N M Plastering Ltd | Construction | 2015 |
| N N Matlou Ltd | Wholesale & retail | 2022 |
| N Natasha Brown Limited | Professional & scientific | 2013 |
| N R Hearn Glazing Limited | Construction | 2013 |
| N Whitney Engineering Limited | Wholesale & retail | 2019 |
| N&D Delivery Limited | Transport & logistics | 2019 |
| N. Allee & Co. | Real estate | 1959 |
| N2 Ventures Ltd | Wholesale & retail | 2025 |
| N3STUDIO Ltd | Professional & scientific | 2025 |
| Naatu Virundhu Ltd | Hospitality | 2025 |
| Nadella Healthcare Consulting Ltd | Professional & scientific | 2026 |
| Naik Consult Ltd | Health & social care | 2022 |
| Nail 21 Ltd | Other services | 2019 |
| NAK Health IT Ltd | Information & communication | 2021 |
| Naked & Noble Ltd | Wholesale & retail | 2019 |
| Nakfi Ltd | Health & social care | 2023 |
| Nalexacare Ltd | Health & social care | 2026 |
| Namah Consultancy Limited | Professional & scientific | 2025 |
| Namaris Ltd | Professional & scientific | 2019 |
| Namaste Aylesbury Ltd | Hospitality | 2025 |
| Nammo (U.K.) Limited | Manufacturing | 1998 |
| Nammo UK Holding Ltd | Other services | 2017 |
| Nanadom Services Limited | Health & social care | 2015 |
| Nanda's Capital and Investments PVT Ltd | Wholesale & retail | 2020 |
| Naps Journey Ltd | Public administration | 2020 |
| Narrable Ltd | Professional & scientific | 2021 |
| NAS Car Ltd | Wholesale & retail | 2019 |
| Naseer Properties Ltd | Real estate | 2024 |
| Nash Property Management Limited | Real estate | 2003 |
| Nashe-Uk Ltd | Health & social care | 2015 |
| Nathan & Sons Civils Ltd | Construction | 2023 |
| National Paralympic Heritage Trust | Arts & recreation | 2015 |
| National Tyre Distributors Association | Other services | 2023 |
| Nationwide Assets Ltd | Construction | 2020 |
| Natreiarc Ltd | Construction | 2023 |
| Natural Health Practice Ltd | Manufacturing | 2016 |
| Nature Bound Rentals Ltd | Wholesale & retail | 2024 |
| Navakar Consultancy Limited | Wholesale & retail | 2018 |
| Nayler Construction Limited | Construction | 2016 |
| NAZ UK Motors Ltd | Wholesale & retail | 2025 |
| Nazing Properties Ltd | Real estate | 2023 |
| NBC Utilities Ltd | Construction | 2017 |
| Ncroberts Landscapes Ltd | Administrative & support | 2022 |
| Ncsi Consultancy Ltd | Professional & scientific | 2018 |
| ND Property Renovations Limited | Real estate | 2015 |
| Neat Clinic H&W Limited | Health & social care | 2024 |
| Nebulosity HCM Consulting Ltd | Professional & scientific | 2015 |
| Necessity School UK Ltd | Education | 2019 |
| Needed Futures Ltd | Professional & scientific | 2026 |
| Negus Services Limited | Construction | 2025 |
| Neighbours Lottery Services Ltd | Professional & scientific | 2019 |
| Neil Higson Land Art Ltd | Professional & scientific | 2004 |
| Neil M Court Ltd | Professional & scientific | 2016 |
| Neil Page & SON (Builders) Limited | Construction | 2008 |