| Mjvd Properties Ltd | Real estate | 2024 |
| MK Capital Investments Ltd | Real estate | 2022 |
| MK Carpentry Ltd | Manufacturing | 2017 |
| MK City Group Ltd | Construction | 2009 |
| MK Drainage Ltd | Construction | 2018 |
| MK Elite Health Ltd | Health & social care | 2020 |
| MK Smart Services Ltd | Manufacturing | 2023 |
| Mkgp Solutions Ltd | Information & communication | 2019 |
| MKM Global Commercial Cleaning & Hospitality Ltd | Administrative & support | 2022 |
| Mkrm Partners Limited | Professional & scientific | 2014 |
| Mkrw Properties Ltd | Real estate | 2023 |
| MKS Financial Ltd | Professional & scientific | 2025 |
| Ml&Nl Property Ltd | Real estate | 2025 |
| MLD Computing Limited | Information & communication | 2007 |
| MLK Invest Ltd | Professional & scientific | 2018 |
| MLS Hygiene Limited | Health & social care | 2024 |
| MM Luxury Building Limited | Construction | 2019 |
| MM Piling Ltd | Construction | 2019 |
| MM Prime Estate Ltd | Real estate | 2024 |
| MM Strategy Consulting Ltd | Professional & scientific | 2022 |
| Mm&Pm Holdings Ltd | Financial services | 2025 |
| MM-903-616 Limited | Real estate | 2021 |
| MMA Busby Ltd | Professional & scientific | 2021 |
| MMA International Ltd | Wholesale & retail | 2017 |
| MMC UK Logistics Limited | Transport & logistics | 2025 |
| MMD Consultant Surveyor Limited | Other services | 2009 |
| MMD Property & Electrical Solutions Ltd | Real estate | 2025 |
| MMD Services Ltd | Real estate | 2013 |
| MMI IT Consulting Ltd | Information & communication | 2019 |
| Mmist Properties Ltd | Real estate | 2022 |
| MMK Transport Limited | Transport & logistics | 2015 |
| Mmm&M Ltd | Information & communication | 2015 |
| MMMX1 Developments Ltd | Construction | 2025 |
| MMMX1 Investments Ltd | Construction | 2025 |
| Mmrk Services Ltd | Transport & logistics | 2010 |
| MMV Cream Deluxe Ltd | Wholesale & retail | 2023 |
| MMV Fibre Infinity Ltd | Wholesale & retail | 2016 |
| MMV Fibre Ltd | Wholesale & retail | 2023 |
| MMV Group Ltd | Professional & scientific | 2023 |
| MMV Holdings & Investments Ltd | Financial services | 2023 |
| MMV Properties Ltd | Real estate | 2023 |
| MMY Enterprises Ltd | Real estate | 2019 |
| MMY Holdings Ltd | Real estate | 2024 |
| MN Feathers Ltd | Wholesale & retail | 2025 |
| MN Health & Beauty Limited | Wholesale & retail | 2026 |
| MN Pharma International Limited | Wholesale & retail | 2023 |
| MN Syed Services Limited | Transport & logistics | 2014 |
| MNA Consulting Services Ltd | Professional & scientific | 2020 |
| MNF Facades Build Ltd | Construction | 2025 |
| MNJ Motors Ltd | Wholesale & retail | 2024 |
| MNM Integrated Property Limited | Real estate | 2023 |
| Mnms Network Solutions Limited | Information & communication | 2024 |
| Mnns Limited | Wholesale & retail | 2024 |
| MO & Amena Consultancy Ltd | Professional & scientific | 2019 |
| Mo's Designs Ltd | Manufacturing | 2019 |
| MOA Biotech Ltd | Professional & scientific | 2026 |
| Mobile Commerce & Other Media Limited | Information & communication | 2009 |
| Mobile Mechanics One Stop Ltd | Wholesale & retail | 2026 |
| Mobile Mechwall Solution Limited | Construction | 2024 |
| Mobile Therapies Hertfordshire Ltd | Other services | 2025 |
| Mobile Therapies Watford Ltd | Other services | 2025 |
| Mobilebitz London Ltd | Wholesale & retail | 2026 |
| Mocha & Latte Catering Ltd | Hospitality | 2023 |
| Mocha Latte Ltd | Professional & scientific | 2016 |
| Mock Mind Ltd | Information & communication | 2026 |
| Moconsult Limited | Professional & scientific | 2013 |
| MOD Wear Ltd | Wholesale & retail | 2026 |
| MODA360 Ltd | Wholesale & retail | 2026 |
| Modan Services Ltd | Professional & scientific | 2019 |
| Modasa Ltd | Wholesale & retail | 2025 |
| Modeks Solutions Ltd | Information & communication | 2023 |
| Modelogic Limited | Arts & recreation | 2013 |
| Modenzo Limited | Manufacturing | 2025 |
| Modern IT & Telecom Ltd | Information & communication | 2024 |
| Modern Maids Cleaning Company Ltd | Administrative & support | 2025 |
| Modern Marketing Ltd | Professional & scientific | 2026 |
| Modernview Homes Ltd | Real estate | 2021 |
| Modernview Investments Ltd | Real estate | 2020 |
| Modervised Ltd | Wholesale & retail | 2023 |
| Modpay Systems Ltd | Information & communication | 2015 |
| Modspace Solutions Limited | Construction | 2023 |
| Modular Data Systems Limited | Manufacturing | 2026 |
| Modular Glass System NEO Ltd | Construction | 2015 |
| Moet Investments Limited | Financial services | 2025 |
| Mofa Developments Ltd | Construction | 2025 |
| MOG Fitness Limited | Other services | 2020 |
| Mohan Ardross | Extraterritorial | 2011 |
| Mohra Limited | Wholesale & retail | 2018 |
| Mohsin and Javed Limited | Wholesale & retail | 2015 |
| MOI Talo Limited | Households | 2019 |
| Mojo Fusion Ltd C.I.C. | Hospitality | 2021 |
| Mokaa Architects Ltd | Professional & scientific | 2020 |
| Molibety Capital Ltd | Professional & scientific | 2023 |
| Molla Bros Construction Ltd | Construction | 2021 |
| Molloy Family Partnership Limited | Professional & scientific | 2011 |
| Moloney Rigging Services Limited | Other services | 2017 |
| Molyneux Vehicle Solutions Limited | Manufacturing | 2020 |
| Moments & More Ltd | Professional & scientific | 2020 |
| Momo Solutions Ltd | Wholesale & retail | 2021 |
| Momodou Jagne Limited | Transport & logistics | 2019 |