| Muhammad ALI Mpharm Ltd | Health & social care | 2015 |
| Mulherin Limited | Other services | 2018 |
| Multiblast NW Ltd | Other services | 2018 |
| Multifit Installations Limited | Construction | 2003 |
| Multisensor Systems Limited | Professional & scientific | 2006 |
| Muma Collection Ltd | Wholesale & retail | 2023 |
| Mumtaz Optics Ltd | Wholesale & retail | 2024 |
| Mundy Services Ltd | Wholesale & retail | 2023 |
| Murphey's Law Ltd | Real estate | 2024 |
| Music in Health C.I.C. | Health & social care | 2025 |
| My Accountancy Group Limited | Professional & scientific | 2023 |
| My Accountant Group Limited | Professional & scientific | 2023 |
| My Birmingham Accountant Limited | Professional & scientific | 2023 |
| My Bristol Accountant Limited | Professional & scientific | 2023 |
| My Consulting Limited | Information & communication | 2022 |
| My Debt Plan Ltd | Financial services | 2017 |
| My Finance Consultancy Ltd | Professional & scientific | 2026 |
| My Finance Gateway Ltd | Financial services | 2024 |
| My Liverpool Accountant Limited | Professional & scientific | 2023 |
| My London Accountant Ltd | Extraterritorial | 2023 |
| My Manchester Accountant Limited | Professional & scientific | 2023 |
| My Money Advice Ltd | Financial services | 2019 |
| My Nottingham Accountant Limited | Professional & scientific | 2023 |
| My Phone Company (UK) Ltd | Information & communication | 2013 |
| My Trade Portal Limited | Information & communication | 2026 |
| My-Home Property Lettings Limited | Real estate | 2019 |
| MY22 Ltd | Financial services | 2022 |
| Myah 24 Limited | Professional & scientific | 2024 |
| Mybiobuild Ltd | Information & communication | 2020 |
| Mycoape Ltd | Wholesale & retail | 2025 |
| Myfirstmotor.Co.Uk Ltd | Information & communication | 2019 |
| Mygreens Ltd | Hospitality | 2019 |
| Myhq Hub Limited | Real estate | 2020 |
| MYL Estate Consulting Group Ltd | Real estate | 2024 |
| Myles Developments Limited | Construction | 2008 |
| MYM Commerce Ltd | Wholesale & retail | 2023 |
| Myna Limited | Information & communication | 2004 |
| Mynb Healthcare Ltd | Health & social care | 2025 |
| Mypay Limited | Administrative & support | 2007 |
| Myperfectbar Ltd | Wholesale & retail | 2023 |
| Myron Estates Limited | Real estate | 2020 |
| Mystic Solutions Ltd | Professional & scientific | 2022 |
| Mzka Ltd | Hospitality | 2025 |
| N Jabeen Ltd | Wholesale & retail | 2024 |
| N Marshall & SON Ltd | Construction | 2015 |
| N&N Property Care Manchester Limited | Manufacturing | 2025 |
| N&Z Consultants Ltd | Wholesale & retail | 2025 |
| N-Consult Limited | Administrative & support | 2008 |
| N. Choudhry & Co Limited | Construction | 2004 |
| N.E. Accountancy Limited | Professional & scientific | 2026 |
| Naat Tech Limited | Information & communication | 2021 |
| Nabaz Limited | Real estate | 2024 |
| Nabco UK Limited | Real estate | 1999 |
| Naddle Management Limited | Administrative & support | 1992 |
| Nafay Living Ltd | Other services | 2023 |
| Nafezmed Ophthalmologist Limited | Health & social care | 2014 |
| Nails by MIA Ltd | Other services | 2025 |
| Nalan Medicare Limited | Information & communication | 2026 |
| Namit FS Ltd | Professional & scientific | 2012 |
| Nanda United Limited | Real estate | 2021 |
| Nanye Group Limited | Administrative & support | 2018 |
| Nara Roll & Co Limited | Hospitality | 2023 |
| Naru Properties Ltd | Construction | 2024 |
| NAS UK Limited | Wholesale & retail | 2009 |
| Nashira Limited | Real estate | 2025 |
| Natalie Husdan Ltd | Arts & recreation | 2020 |
| Nathan House Properties Limited | Real estate | 2001 |
| National Injury Claims Ltd | Administrative & support | 2015 |
| National Talent Limited | Administrative & support | 2024 |
| Nationwide Consulting Ltd | Professional & scientific | 2021 |
| Nationwide Grounds Limited | Other services | 2026 |
| Nationwide Partners Limited | Professional & scientific | 2023 |
| Nationwide Property Developments Limited | Administrative & support | 2006 |
| Nationwide Property Group Limited | Professional & scientific | 2015 |
| Navigating Minds Limited | Health & social care | 2024 |
| Navigation Finance Ltd | Financial services | 2024 |
| Nayebi Beans Ltd | Wholesale & retail | 2025 |
| NB Healthcare Industries Ltd | Financial services | 2022 |
| NB Tuition Ltd | Education | 2024 |
| NBK Pharmaceutics Ltd | Wholesale & retail | 2022 |
| Ndlm Limited | Real estate | 2016 |
| Neale Heating & Plumbing Ltd | Construction | 2025 |
| Neelam’S Hair Limited | Other services | 2024 |
| Nefes Gardens Landscape Design Ltd | Wholesale & retail | 2022 |
| Neighbourhood TAP Ltd | Hospitality | 2024 |
| Neil Fitzgerald Limited | Financial services | 2003 |
| Neil Millar Legal Consultancy Limited | Professional & scientific | 2019 |
| Nelson & Murdock Accountants Ltd | Professional & scientific | 2020 |
| NEO Traders Ltd | Wholesale & retail | 2020 |
| NEO Trading Enterprise Ltd | Wholesale & retail | 2026 |
| NEO Wealth Ltd | Financial services | 2021 |
| Neon Guys Ltd | Professional & scientific | 2019 |
| Nero SIP Ltd | Construction | 2025 |
| Nestgoods Ltd | Wholesale & retail | 2025 |
| NET Zero North West Ltd | Extraterritorial | 2020 |
| Netibs Ltd | Information & communication | 2020 |
| New Approach Recruitment Limited | Administrative & support | 2012 |
| New Beginnings Children’S Homes Ltd | Health & social care | 2023 |
| New Built Limited | Real estate | 2020 |
| New Concept Home Improvements Ltd | Construction | 2014 |