| ML Surgical Limited | Health & social care | 2023 |
| MLA Contractors Ltd | Construction | 2025 |
| MLB Accessories Limited | Wholesale & retail | 2023 |
| MLE Planner Ltd | Wholesale & retail | 2021 |
| Mlinkz Private Limited | Professional & scientific | 2025 |
| Mljd Shwartz Limited | Professional & scientific | 2015 |
| MLX Contractors Ltd | Construction | 2016 |
| MLX Development Construction Ltd | Construction | 2015 |
| MM (Ldjin) Distribution Limited | Information & communication | 2022 |
| MM (Ldjin) Productions Limited | Information & communication | 2022 |
| MM Arran Ltd | Hospitality | 2026 |
| MM Art & Culture Tribe Limited | Arts & recreation | 2025 |
| MM Asharia Ltd | Professional & scientific | 2021 |
| MM Automotive GRP Limited | Wholesale & retail | 2024 |
| MM Building Solutions Ltd | Construction | 2023 |
| MM Cleary Holdings Limited | Agriculture & fishing | 2024 |
| MM Comm Solution Ltd | Wholesale & retail | 2023 |
| MM Corp Limited | Other services | 2015 |
| MM Global Properties Limited | Real estate | 2025 |
| MM Imoveis Limited | Real estate | 2018 |
| MM Motel Destino Production Limited | Information & communication | 2023 |
| Mm&Grandsons Ltd | Information & communication | 2021 |
| MM1 Investments Ltd | Real estate | 2017 |
| MM10 Investments Ltd | Real estate | 2015 |
| MM2 Investments Ltd | Real estate | 2017 |
| MM3 Investments Ltd | Real estate | 2017 |
| MM4 Investments Ltd | Real estate | 2017 |
| MM5 Investments Ltd | Real estate | 2018 |
| MM6 Investments Ltd | Real estate | 2020 |
| MM7 Investments Ltd | Real estate | 2020 |
| MM8 Investments Ltd | Real estate | 2020 |
| MM9 Investments Limited | Real estate | 2015 |
| MMB Property Ltd | Real estate | 2020 |
| MMC Construct Ltd | Construction | 2025 |
| Mmdn Property Trading Limited | Construction | 2012 |
| MMH Services Ltd | Health & social care | 2025 |
| Mmjr Services Ltd | Transport & logistics | 2025 |
| Mmkk Cloud Ltd | Information & communication | 2021 |
| MML Build Limited | Construction | 2004 |
| MMM511 Ltd | Administrative & support | 2018 |
| MMP Marketing Limited | Wholesale & retail | 2015 |
| MMR Property Holdings Ltd | Real estate | 2026 |
| MMS Drylining Ltd | Construction | 2025 |
| MMS Tech Ltd | Wholesale & retail | 2024 |
| MMSPV1 Limited | Real estate | 2022 |
| MMT Partnership Ltd | Professional & scientific | 2023 |
| Mmtop Construction Ltd | Hospitality | 2024 |
| MMX Retail Property Advisers LLP | | 2009 |
| MN Hayder Ltd | Transport & logistics | 2019 |
| MN Heating & Plumbing Limited | Construction | 2025 |
| MNC Eco Electrical Services Ltd | Construction | 2022 |
| MNC Energy Ltd | Construction | 2023 |
| MND Childcare Limited | Education | 2026 |
| MND Numbers Company Limited | Professional & scientific | 2025 |
| MNK Capital Holdings Limited | Financial services | 2026 |
| MNK Enterprises UK Ltd | Wholesale & retail | 2024 |
| MNK Group Holdings Limited | Professional & scientific | 2019 |
| MNK International Ltd | Financial services | 2009 |
| MNK Investire Ltd | Real estate | 2025 |
| MNK RE Specialty Limited | Financial services | 2021 |
| Mnly Ltd | Professional & scientific | 2022 |
| MNM Estates Ltd | Households | 2018 |
| MNO Properties Ltd | Real estate | 2015 |
| MNS Care PLC | Health & social care | 1997 |
| MNS Group Holdings Limited | Arts & recreation | 2018 |
| MNS GRP Ltd | Education | 2004 |
| MNS London Ltd | Wholesale & retail | 2018 |
| Mntpartners Ltd | Wholesale & retail | 2023 |
| MO Stone Ltd | Construction | 2026 |
| Mo's Controls Ltd | Professional & scientific | 2023 |
| Mo's Digital X Ltd | Financial services | 2025 |
| Moat Lodge Management Company Limited | Households | 1990 |
| MOB X LDN Ltd | Wholesale & retail | 2023 |
| Mobile Accessories Store Limited | Wholesale & retail | 2018 |
| Mobile and IT Services Limited | Other services | 2015 |
| Mobile DRY Cleaning & Laundry Ltd | Other services | 2022 |
| Mobile Gift and Accessories Limited | Wholesale & retail | 2020 |
| Mocktology Limited | Hospitality | 2017 |
| Modage Limited | Real estate | 2011 |
| Modality Healthcare Limited | Administrative & support | 2018 |
| Modecor Industries PVT Ltd | Manufacturing | 2023 |
| Modera Ltd | Manufacturing | 2025 |
| Modern Building Construction Ltd | Real estate | 2024 |
| Modern Romance Ltd | Arts & recreation | 2010 |
| Modern Skyrise Ltd | Construction | 2026 |
| Modern Trading & Services LLP | | 2016 |
| Modernliving Construction Limited | Construction | 2025 |
| Modernmove Limited | Manufacturing | 1988 |
| Moderntronics Limited | Mining & quarrying | 1999 |
| Modernwest Limited | Real estate | 1980 |
| Modes Pro Ltd | Wholesale & retail | 2022 |
| Modest Property Limited | Real estate | 2022 |
| Modgift Limited | Real estate | 1978 |
| Modha Enterprise Limited | Wholesale & retail | 2026 |
| Modified Motion Ltd | Information & communication | 2024 |
| Modify Capital Limited | Construction | 2024 |
| Moetaz & Michael Hair Studio Limited | Other services | 2018 |
| Mogal World Limited | Wholesale & retail | 2025 |
| MOH London Ltd | Wholesale & retail | 2012 |
| Mohali Medical Limited | Health & social care | 2015 |