| Murilabi Consulting Ltd | Information & communication | 2024 |
| Murphys Properties Services Limited | Real estate | 2024 |
| Murray Firestopping Ltd | Construction | 2025 |
| Murray Management Essex Ltd | Real estate | 2023 |
| Murray Steelworks Ltd | Manufacturing | 2020 |
| Murray Tiling Limited | Construction | 2012 |
| Musareva Limited | Health & social care | 2012 |
| Music and ME Limited | Arts & recreation | 2015 |
| Music Club International Ltd | Arts & recreation | 2024 |
| Music Teachers 4 Schools Limited | Education | 2018 |
| Musician's Toolkit Limited | Information & communication | 2025 |
| Mutila Construction Ltd | Construction | 2022 |
| Mutton & MAC Shack Limited | Hospitality | 2019 |
| Muva and Moments Ltd | Information & communication | 2025 |
| MVM Trans Ltd | Transport & logistics | 2017 |
| MVP & Sons Properties Ltd | Real estate | 2020 |
| MVP Collectibles UK Ltd | Wholesale & retail | 2021 |
| Mvrs Services Ltd | Transport & logistics | 2026 |
| Mvvm Ltd | Construction | 2017 |
| MW Buli Transport Ltd | Transport & logistics | 2023 |
| MX Hair Ltd | Information & communication | 2024 |
| My Angel Care Services Ltd | Public administration | 2024 |
| My Angry Pasta Ltd | Manufacturing | 2021 |
| My App Ltd | Administrative & support | 2024 |
| My Aura Aesthetics Ltd | Wholesale & retail | 2025 |
| My Big Manual Limited | Health & social care | 2025 |
| My Development Ltd | Real estate | 2025 |
| My Executive Assistant (London) Ltd | Administrative & support | 2015 |
| My Fitness Consultant Ltd | Professional & scientific | 2023 |
| My Lovely Car Ltd | Wholesale & retail | 2023 |
| Mygifti Limited | Wholesale & retail | 2024 |
| Mymax Consultancy Ltd | Information & communication | 2021 |
| Myrazach Ltd | Health & social care | 2021 |
| Myria Solutions Limited | Real estate | 2018 |
| Myrmidon Trading Technologies Limited | Professional & scientific | 2015 |
| Myscience Solutions Ltd | Information & communication | 2013 |
| Mystar Limited | Other services | 2016 |
| Mytrinity Training Centre (Mttc) Ltd | Education | 2012 |
| MZ Cart Ltd | Wholesale & retail | 2025 |
| MZ Install Ltd | Construction | 2021 |
| MZ Premium Traders Ltd | Wholesale & retail | 2025 |
| MZB Media Consulting Limited | Professional & scientific | 2024 |
| N B Bartlett Ltd | Manufacturing | 2020 |
| N&A Financial Services Ltd | Professional & scientific | 2022 |
| N&C Dryliner Ltd | Construction | 2025 |
| N&N Accountants Ltd | Professional & scientific | 2024 |
| N2E Ltd | Professional & scientific | 2024 |
| N2E Properties Ltd | Real estate | 2024 |
| NA Southend Property Ltd | Real estate | 2024 |
| Naakari Ltd | Administrative & support | 2023 |
| Nadef Ltd | Transport & logistics | 2012 |
| Nafelic Ltd | Professional & scientific | 2020 |
| Nagy Trans Ltd | Transport & logistics | 2020 |
| Naledi International Ltd | Transport & logistics | 2023 |
| Nalluran Properties Ltd | Real estate | 2025 |
| Nanak Build Limited | Construction | 2025 |
| Nantine Limited | Health & social care | 2015 |
| Narai Holdings Limited | Financial services | 2025 |
| Narly Ltd | Real estate | 2023 |
| NAS 92 Ltd | Construction | 2016 |
| Nasbell International Limited | Public administration | 2022 |
| Nascu Petru Limited | Transport & logistics | 2018 |
| Nashford Limited | Real estate | 2023 |
| Nasir Motoworks Limited | Wholesale & retail | 2026 |
| Nated Transit Limited | Transport & logistics | 2026 |
| Nati Construction Ltd | Construction | 2017 |
| Natia’S Foot Health Clinic Ltd | Health & social care | 2025 |
| National Electrical Installations Ltd | Construction | 2015 |
| National Healthcare Ltd | Health & social care | 2018 |
| Nationwide LGV Training Limited | Education | 2017 |
| Natures Hubb Limited | Hospitality | 2020 |
| Naturhin Limited | Wholesale & retail | 2024 |
| Navera Digital Ltd | Information & communication | 2025 |
| Navi Solutions Limited | Manufacturing | 2020 |
| Navigator Terminals Limited | Administrative & support | 2015 |
| Navigator Terminals Midco Limited | Mining & quarrying | 2015 |
| Navigator Terminals North Tees Limited | Mining & quarrying | 2015 |
| Navigator Terminals Seal Sands Limited | Transport & logistics | 1964 |
| Navigator Terminals Thames Limited BV | | 2023 |
| Navigator Terminals UK Limited | Professional & scientific | 1977 |
| Navigator Terminals Windmill Limited | Transport & logistics | 1946 |
| Nazanu Creations Ltd | Wholesale & retail | 2021 |
| NB Haulage Ltd | Transport & logistics | 2023 |
| NBH Group Ltd | Construction | 2015 |
| NDM Heating Plumbing Ltd | Construction | 2016 |
| NDM Services Ltd | Other services | 2021 |
| NDÉ Aesthetics and Wellbeing Ltd | Other services | 2026 |
| Ne&Lu Ltd | Construction | 2019 |
| Neapolis Pizzeria Ristorante Limited | Hospitality | 2000 |
| Neil Transport Ltd | Wholesale & retail | 2021 |
| Nems Medical Ltd | Health & social care | 2023 |
| Nemz.Net Properties Ltd | Real estate | 2021 |
| Neptune Fish Bar Ltd | Hospitality | 2016 |
| Neredis Ltd | Information & communication | 2025 |
| Nesatron Community Interest Company | Information & communication | 2025 |
| Nestalil Properties Ltd | Real estate | 2022 |
| Nestfive Properties Ltd | Real estate | 2025 |
| Nethall Technologies Limited | Information & communication | 2021 |
| Netid Ltd | Information & communication | 2023 |
| Nett Consultant Ltd | Professional & scientific | 2025 |