| Madrugada Properties Ltd | Construction | 2019 |
| Maercaplex Limited | Wholesale & retail | 2026 |
| Maestro Commodities Trading & Shipping Company Limited | Wholesale & retail | 2020 |
| Maetivia Ltd | Wholesale & retail | 2025 |
| Mafhh Nine Limited | Wholesale & retail | 2026 |
| Mafunzo Technologies Ltd | Information & communication | 2025 |
| MAG Yachting Limited | Administrative & support | 2025 |
| Magari MMG Ltd | Health & social care | 2018 |
| Magbee Limited | Wholesale & retail | 2026 |
| Magenta Accommodation Ltd | Hospitality | 2023 |
| Maggie & ME Limited | Information & communication | 2017 |
| Magic Garden Products Ltd | Construction | 2023 |
| Magic Management Promotions Ltd | Other services | 2021 |
| Magicks Emporium Limited | Other services | 2024 |
| Magicverse Ltd | Information & communication | 2025 |
| Magnesia Supplier Ltd | Wholesale & retail | 2026 |
| Magnify Academy Limited | Education | 2023 |
| Magnifyi Limited | Professional & scientific | 2024 |
| Magniphy Ltd | Information & communication | 2021 |
| Magnum Coatings & Renova Limited | Manufacturing | 2026 |
| Magpie Moon Limited | Financial services | 2024 |
| Magplycrafts Limited | Wholesale & retail | 2022 |
| MAH Holdingz Ltd | Real estate | 2024 |
| Mahk Stores Limited | Wholesale & retail | 2025 |
| Mahlan Limited | Wholesale & retail | 2025 |
| Mahmut Guler Ltd | Wholesale & retail | 2023 |
| Maidstone Advisory Limited | Professional & scientific | 2025 |
| Mailyn Properties Limited | Real estate | 2022 |
| Maisie Willis Ltd | Manufacturing | 2023 |
| Maison Identique Ltd | Wholesale & retail | 2026 |
| Maison Maks Ltd | Real estate | 2023 |
| Maison Marella Ltd | Wholesale & retail | 2025 |
| Maison Mensah Limited | Information & communication | 2025 |
| Maison Nanon Limited | Wholesale & retail | 2025 |
| Maison Optimale Ltd | Financial services | 2025 |
| Maison Sasson Ltd | Manufacturing | 2021 |
| Maison Scriptor Publishing Ltd | Information & communication | 2026 |
| Maisonvelira Ltd | Wholesale & retail | 2026 |
| Majdoub Capital Ltd | Real estate | 2025 |
| Majestic Legal Services Ltd | Professional & scientific | 2011 |
| Majestic Picks Ltd | Wholesale & retail | 2021 |
| Majime Consulting Limited | Information & communication | 2022 |
| Majnun Films Ltd | Information & communication | 2018 |
| Make IT Happen Mindset Ltd | Professional & scientific | 2025 |
| Makeitso Productions Ltd | Information & communication | 2022 |
| Makeo Consulting Ltd | Professional & scientific | 2020 |
| Maker Software Ltd | Wholesale & retail | 2025 |
| Makh House Ltd | Real estate | 2025 |
| Making Stuffs Ltd | Information & communication | 2023 |
| Makinus Ltd | Wholesale & retail | 2025 |
| Makks Premium African Foods Limited | Hospitality | 2024 |
| Mako Homes Ltd | Real estate | 2022 |
| Malaney & Co Consultants Limited | Information & communication | 2026 |
| Mallard Engineering Solutions Ltd | Professional & scientific | 2024 |
| Malti Limited | Real estate | 2020 |
| Malvorah Ltd | Information & communication | 2025 |
| Malzin Properties Limited | Real estate | 2025 |
| Mammoth House Ltd | Administrative & support | 2024 |
| Mamre Limited Partnership | | 2024 |
| Manage My Business Ltd | Information & communication | 2023 |
| Managed Parking Services Ltd | Administrative & support | 2025 |
| Mandu Home Furnishings Limited | Wholesale & retail | 2025 |
| Mangadex UK Ltd | Information & communication | 2025 |
| Manhatten Ltd | Households | 2025 |
| Manifest Global Limited | Wholesale & retail | 2025 |
| Manifestation Sisters Ltd | Education | 2023 |
| Manifestation Tracker LLP | | 2023 |
| Manifold Consulting Limited | Information & communication | 2025 |
| Mankind Store Limited | Wholesale & retail | 2024 |
| Manna Education & Consulting Limited | Education | 2025 |
| Manorhouse Corp Ltd | Wholesale & retail | 2025 |
| Mansio Fosse Ltd | Real estate | 2025 |
| Mantra London Ltd | Information & communication | 2024 |
| Manufactured Joy Ltd | Information & communication | 2024 |
| Manxbike Ltd | Manufacturing | 2026 |
| Maple Arch Property Limited | Real estate | 2024 |
| Maple Green Limited | Real estate | 2026 |
| Maploft Ltd | Information & communication | 2026 |
| Mapzora Ltd | Information & communication | 2025 |
| Maraadina Ltd | Arts & recreation | 2024 |
| Maramy Investment Ltd | Real estate | 2024 |
| Marchingtons Ltd | Manufacturing | 2017 |
| Marcoq Ltd | Professional & scientific | 2022 |
| Mare Diamond Limited | Wholesale & retail | 2021 |
| Mare E Monti Limited | Professional & scientific | 2025 |
| Margalla Research Ltd | Professional & scientific | 2025 |
| Maria B. Campbell Associates UK, Ltd. | Information & communication | 2013 |
| Maria Djurkovic Limited | Information & communication | 2019 |
| Marie C. Wellness Ltd | Information & communication | 2025 |
| Marieva Aesthetics Ltd | Health & social care | 2026 |
| Marina Angelova Ltd | Financial services | 2024 |
| Marina Walk Group Ltd | Real estate | 2024 |
| Maritime & Ports Advisory Group (Mpag) Ltd | Professional & scientific | 2024 |
| Maritime Search and Rescue Council Ltd | Transport & logistics | 2023 |
| Marjam Ltd | Information & communication | 2017 |
| Mark Jeremy Pope Ltd | Extraterritorial | 2024 |
| Marketech Solutions Ltd | Information & communication | 2026 |
| MARKETINGGATE8 Ltd | Information & communication | 2025 |
| Marketloom Ltd | Wholesale & retail | 2025 |
| Marketplace Analytics Ltd | Information & communication | 2024 |