| Mheatedow Ltd | Wholesale & retail | 2024 |
| MHR Goods Limited | Wholesale & retail | 2022 |
| MI Solutions HB Ltd | Wholesale & retail | 2026 |
| Mian & Sons London Ltd | Transport & logistics | 2025 |
| Midas GT Exports Limited | Wholesale & retail | 2023 |
| Milson and Freddie Ltd | Professional & scientific | 2025 |
| Minerva Capital Solutions Ltd | Real estate | 2024 |
| Minihomy Ltd | Wholesale & retail | 2022 |
| Miorin Group Ltd | Wholesale & retail | 2025 |
| Mirror Systems Ltd | Information & communication | 2025 |
| Misc Ecom Ltd | Professional & scientific | 2018 |
| Mithlesh Jayswal Limited | Wholesale & retail | 2025 |
| Mixfic Limited | Wholesale & retail | 2021 |
| MMM3.STORE Limited | Wholesale & retail | 2025 |
| MN Optical Ltd | Health & social care | 2015 |
| Moflihoon Ltd | Wholesale & retail | 2026 |
| Mohammad Yasin Ltd | Wholesale & retail | 2023 |
| Monaco Marketing Limited | Professional & scientific | 2026 |
| Monaco Recovery Limited | Transport & logistics | 2026 |
| Monai Ltd | Information & communication | 2025 |
| Monetyze Ltd | Manufacturing | 2019 |
| Moodbranding Ltd | Information & communication | 2025 |
| Mooney Management Solutions Limited | Energy | 2012 |
| Moosha Ltd | Hospitality | 2023 |
| Moretech Limited | Construction | 2009 |
| Morphtec Limited | Information & communication | 2022 |
| Mortgage Bridge Solutions UK Ltd | Administrative & support | 2025 |
| Motianash Digital Solutions Limited | Information & communication | 2025 |
| Mpuer Sale Ltd | Wholesale & retail | 2025 |
| MQ Commerce Ltd | Wholesale & retail | 2025 |
| MR Steam Ltd | Administrative & support | 2023 |
| MR Vape Ltd | Wholesale & retail | 2023 |
| Mrbar LDN Ltd | Wholesale & retail | 2022 |
| MRT33 Limited | Wholesale & retail | 2010 |
| MS Fancy Barbers Limited | Other services | 2024 |
| MT Technical Ltd | Wholesale & retail | 2025 |
| MTL Estates and Developments Limited | Real estate | 2024 |
| Mubashar Traders Ltd | Wholesale & retail | 2026 |
| Muhammad Ayub Khan Ltd | Wholesale & retail | 2025 |
| Muhammad Idrees Ltd | Wholesale & retail | 2024 |
| Muhney Ltd | Wholesale & retail | 2024 |
| Muisc Creation Ltd | Wholesale & retail | 2025 |
| Muish Ltd | Information & communication | 2024 |
| Multan Halal Ltd | Wholesale & retail | 2025 |
| MVP Coaching Ltd | Arts & recreation | 2018 |
| Myrthyn Ltd | Wholesale & retail | 2025 |
| NA Deals Ltd | Wholesale & retail | 2026 |
| Naafiri Trading, Ltd | Wholesale & retail | 2026 |
| Nailora Couture Limited | Wholesale & retail | 2025 |
| Namime Ltd | Public administration | 2025 |
| Nasabi Mental Health Consultation Ltd | Real estate | 2024 |
| Nascent Marketing Services Limited | Administrative & support | 2014 |
| Nathmart Ltd | Wholesale & retail | 2023 |
| Natsysco.Com Limited | Information & communication | 2024 |
| Nauset Digital Limited | Administrative & support | 2022 |
| Nazim Contractors Ltd | Construction | 2026 |
| Neela ED Tech Global Consultancy Ltd | Education | 2024 |
| Neela Sridhar Business Ltd | Professional & scientific | 2014 |
| Neovision Ltd | Construction | 2019 |
| Neriano Ltd | Wholesale & retail | 2025 |
| Netilize UK Limited | Information & communication | 2025 |
| Netsphere Consulting Limited | Information & communication | 2019 |
| Neuraquil Limited | Health & social care | 2007 |
| Neuro Inclusion UK Limited | Professional & scientific | 2024 |
| Neva Cy-Fi Ltd | Information & communication | 2025 |
| New Tesoro D'Italia Ltd | Wholesale & retail | 2017 |
| Newacre Freehold Management Limited | Real estate | 2013 |
| Newham Community Law Project Limited | Professional & scientific | 2025 |
| Nexgen-Musa Ltd | Wholesale & retail | 2025 |
| Nexgency Ltd | Information & communication | 2026 |
| Nexit Consulting Limited | Information & communication | 2017 |
| Nexus Global Managed Services Ltd | Information & communication | 2026 |
| NHL Mart UK Ltd | Wholesale & retail | 2025 |
| Nick Giger Limited | Information & communication | 2020 |
| Ninesix Distribution Ltd | Wholesale & retail | 2024 |
| Nkansah Digital Creation Limited | Wholesale & retail | 2025 |
| Nkfw Ltd | Other services | 2024 |
| NO Context Productions Ltd | Information & communication | 2023 |
| Nobrainer Innovative Studio Ltd | Professional & scientific | 2025 |
| Nolux Ltd | Wholesale & retail | 2025 |
| Nordic AI Ltd | Education | 2021 |
| Northloom Retail Limited | Wholesale & retail | 2025 |
| Northscale Agency Limited | Professional & scientific | 2026 |
| Noshi Twin Limited | Wholesale & retail | 2025 |
| Novel Transformation Technologies Limited | Information & communication | 2023 |
| Numa Estilo Ltd | Wholesale & retail | 2021 |
| Number Seventy Three Limited | Real estate | 2022 |
| Nurture With GOD Ltd | Professional & scientific | 2026 |
| Nuvoria Ltd | Wholesale & retail | 2025 |
| Nuxity Ltd | Information & communication | 2025 |
| NVA Sports & Entertainment Group Limited | Arts & recreation | 2017 |
| Oakville Real Estate Sales Ltd | Real estate | 2000 |
| Obak Group Limited | Education | 2026 |
| Obelle Electrical & Comms Services Ltd | Construction | 2013 |
| Oceanic Care Services Ltd | Health & social care | 2015 |
| Octagon Plus Holding Ltd | Wholesale & retail | 2025 |
| Ohmega Electrical Specialists Limited | Construction | 2018 |
| OK Stores Ltd | Wholesale & retail | 2017 |
| Olivecessory Ltd | Wholesale & retail | 2021 |
| Ombre Touch Ltd | Other services | 2021 |