| MJD Props Ltd | Construction | 2026 |
| MK Business & Services Ltd | Information & communication | 2015 |
| ML Carpentry & Construction Ltd | Construction | 2017 |
| ML MEP Services Ltd | Professional & scientific | 2017 |
| ML Performance Limited | Information & communication | 2015 |
| MLN Consultants Limited | Professional & scientific | 2022 |
| MLW Ltd | Transport & logistics | 2025 |
| MM Courier Ltd | Transport & logistics | 2025 |
| MMB Logistics Ltd | Transport & logistics | 2017 |
| MMS 4X4 Limited | Wholesale & retail | 2026 |
| Mobi IT Consulting Ltd | Administrative & support | 2015 |
| Mobile Worker Plus Limited | Information & communication | 2014 |
| Mobitrue Technologies Ltd | Information & communication | 2019 |
| Mojo Careers Ltd | Other services | 2020 |
| Molaja E Property Ltd | Real estate | 2018 |
| Molfam Property Ltd | Households | 2018 |
| Molproperty Ltd | Real estate | 2025 |
| Monarch Indexing Company Limited | Manufacturing | 1997 |
| Moneta Finance Limited | Professional & scientific | 2011 |
| Monixa Limited | Financial services | 2012 |
| Monixa Operations Limited | Professional & scientific | 2025 |
| Monixa UK Services Limited | Administrative & support | 2025 |
| Monkeyandbearfit Ltd | Education | 2019 |
| Monkeyandbearfit Property Ltd | Real estate | 2019 |
| Montreaux Holdco 1 Ltd | Construction | 2019 |
| Montreaux Sunningdale Ltd | Construction | 2022 |
| Montreaux Wokingham Ltd. | Construction | 2022 |
| Mora Performance Ltd | Transport & logistics | 2022 |
| Morello Properties Ltd | Real estate | 2025 |
| Mortgage Matchmakers Ltd | Financial services | 2018 |
| MOT Centre Heston Trading AS SB Carsales Ltd | Real estate | 2023 |
| Motion Care Ltd | Administrative & support | 2021 |
| Motion Private Chauffeur Ltd | Transport & logistics | 2026 |
| MOTION84 Studio Ltd | Manufacturing | 2023 |
| Motorsland Limited | Wholesale & retail | 2023 |
| Mount Ephraim Limited | Construction | 2024 |
| Mountflex Limited | Wholesale & retail | 2023 |
| Movements Group Limited | Arts & recreation | 2024 |
| MP Project Solutions Limited | Professional & scientific | 2013 |
| MPD Holdings and Investments Limited | Real estate | 2004 |
| MPD Plant Hire Limited | Administrative & support | 2024 |
| MPD Waste Management Limited | Administrative & support | 2021 |
| MR FOX Ltd | Construction | 2023 |
| MR Motor Auto Centres Limited | Real estate | 1997 |
| MR Renovation & Decoration Ltd | Construction | 2023 |
| MRG Consulting Limited | Professional & scientific | 2015 |
| Mrvks Ltd | Construction | 2018 |
| MS Sandhu Builders Ltd | Construction | 2024 |
| MSK Thatta Limited | Information & communication | 2017 |
| MSR Motor Ltd | Wholesale & retail | 2026 |
| MSR Property Group Ltd | Real estate | 2024 |
| MT Connect Ltd | Administrative & support | 2021 |
| MTI Technology Group Limited | Information & communication | 2016 |
| MTM Barbers Ltd | Other services | 2026 |
| MTS Tech Ltd | Professional & scientific | 2026 |
| Muhammad Adnan Ltd | Wholesale & retail | 2025 |
| Multiskills Builder Ltd | Construction | 2022 |
| Mums & Sons Limited | Transport & logistics | 2012 |
| Munawar Management Consulting Ltd. | Real estate | 2016 |
| Mustanggt 1981 Ltd | Transport & logistics | 2020 |
| MVD Consulting Ltd | Professional & scientific | 2017 |
| Myac PVT Ltd | Information & communication | 2018 |
| Mybizopz Ltd | Information & communication | 2026 |
| Mycoco Cafe Limited | Hospitality | 2025 |
| Myjournee Limited | Manufacturing | 2025 |
| N&Bt Ltd | Information & communication | 2026 |
| N&G Investments Limited | Other services | 2007 |
| N-Tek Limited | Construction | 2008 |
| N.J. Food & Wine Ltd | Wholesale & retail | 2016 |
| NAD Insulations Limited | Construction | 1997 |
| Nahals Properties Limited | Real estate | 2021 |
| Nanak and TAJ Investments Ltd | Real estate | 2024 |
| Nara IT Ltd | Information & communication | 2025 |
| Narwhal Logistics Ltd | Transport & logistics | 2024 |
| Nashanth Services Limited | Real estate | 2025 |
| Nashanth Technologies Limited | Information & communication | 2015 |
| National Green Alliance Ltd | Professional & scientific | 2017 |
| National UK Roofing Ltd | Construction | 2025 |
| Nationwide Training and Assessment Limited | Information & communication | 2025 |
| Nawarathna Limited | Health & social care | 2023 |
| NDA Clifton Investments Ltd | Real estate | 2018 |
| NDA Investments Ltd | Real estate | 2017 |
| Ndivea Group Ltd | Information & communication | 2026 |
| Ndlfreeholds Ltd | Extraterritorial | 2022 |
| NDS Screeding Limited | Construction | 2014 |
| Nearuni Limited | Real estate | 2025 |
| Neat 5KY Limited | Wholesale & retail | 2019 |
| Neatheart Services Ltd | Wholesale & retail | 2025 |
| Nebula Fortress Limited | Administrative & support | 2025 |
| Needle and Eagle Ltd | Wholesale & retail | 2020 |
| Neel & SIM Property Development Ltd | Households | 2025 |
| Neel & Simm Properties Ltd | Households | 2026 |
| Neel and SIM Properties Ltd | Real estate | 2026 |
| Neelran & Co Limited | Real estate | 2026 |
| Neet Staines London Limited | Wholesale & retail | 2024 |
| Neil Patel Digital Limited | Administrative & support | 2021 |
| Nelson Managed Services Limited | Professional & scientific | 2025 |
| Neon Event Designs Ltd | Manufacturing | 2025 |
| Nerni Ltd | Wholesale & retail | 2025 |
| Nesr Limited | Extraterritorial | 2017 |