| Marking Master Ltd | Education | 2023 |
| Marmalade Creative Studios Ltd | Professional & scientific | 2024 |
| Marmolada Ltd | Wholesale & retail | 2023 |
| Marnista Ltd | Wholesale & retail | 2021 |
| Maromania Ltd | Information & communication | 2023 |
| Marquanta Limited | Wholesale & retail | 2026 |
| Mars Consultancy Limited | Professional & scientific | 2019 |
| Marsay Property Limited | Real estate | 2023 |
| Marston Creations Ltd | Arts & recreation | 2024 |
| Marta Events Ltd | Hospitality | 2025 |
| Martech AI Solutions Ltd | Information & communication | 2025 |
| Marten Publishing Limited | Information & communication | 2025 |
| Martin Blackburn AKA Marblack Ltd | Administrative & support | 2023 |
| Martin Construction BUILD4U Ltd | Construction | 2025 |
| Marumono Ltd | Wholesale & retail | 2025 |
| Marvona Limited | Wholesale & retail | 2026 |
| Mary Van Ltd | Wholesale & retail | 2022 |
| Masoeurette Consulting Ltd | Information & communication | 2025 |
| Mason Vale Recruitment Ltd | Administrative & support | 2026 |
| Maspie Estates Limited | Real estate | 2018 |
| Masstok Limited | Information & communication | 2024 |
| Mast Properties Limited | Real estate | 2025 |
| Master Ecom LLP | | 2025 |
| Masum Bottle Company Limited | Wholesale & retail | 2023 |
| Mate Dates CIC | Arts & recreation | 2025 |
| Mathful Ltd | Education | 2021 |
| Matosi UK Limited | Construction | 2025 |
| Matrix Capital Group Limited | Financial services | 2024 |
| Matrix Magic Media UN Limited | Information & communication | 2025 |
| Matson Property Group Ltd | Construction | 2025 |
| Matt Jones Nutrition Ltd | Hospitality | 2023 |
| Matter 2 Media Ltd | Information & communication | 2009 |
| Matthews Interiors Limited | Construction | 2023 |
| Matts Motors Limited | Wholesale & retail | 2008 |
| Mauve ME Creates Ltd | Information & communication | 2026 |
| Maverickmutts Dog Grooming Ltd | Other services | 2025 |
| Mavris Consulting Limited | Professional & scientific | 2026 |
| Maxim Process Consultancy Limited | Professional & scientific | 2021 |
| Maxint Ltd | Information & communication | 2016 |
| Maxstoke Consulting Limited | Professional & scientific | 2022 |
| Maymons Tea Zone Ltd | Hospitality | 2024 |
| Maynard Group Properties Limited | Real estate | 2019 |
| Mazeoptions Investments Limited | Financial services | 2025 |
| MB Retail Group Ltd | Wholesale & retail | 2025 |
| MB Sea Global Limited | Professional & scientific | 2025 |
| MB Total Property Services Ltd | Construction | 2025 |
| Mbaf Ltd | Information & communication | 2017 |
| Mbay Agency Ltd | Wholesale & retail | 2025 |
| MBC Caledonia Ltd | Real estate | 2025 |
| MBP Global Limited | Wholesale & retail | 2025 |
| Mccauley Ventures Ltd | Professional & scientific | 2026 |
| Mccollum Associates Limited | Information & communication | 2018 |
| Mcdermott Residential Property Limited | Real estate | 2021 |
| Mcdl Ltd | Information & communication | 2009 |
| Mcgregor Dispatch Limited | Transport & logistics | 2011 |
| Mchafion Ltd | Wholesale & retail | 2024 |
| Mcisaac & Co. Ltd | Professional & scientific | 2025 |
| MCK and Sons Limited | Information & communication | 2019 |
| Mckenzie Consociati Limited | Financial services | 2026 |
| Mckeown’S Slices Limited | Hospitality | 2025 |
| Mcspoon Consulting Ltd | Professional & scientific | 2015 |
| MDR Stock Ltd | Wholesale & retail | 2023 |
| Mdrs Services Ltd | Information & communication | 2026 |
| MEA Global Ltd | Wholesale & retail | 2023 |
| Meadow ARK Ltd | Information & communication | 2023 |
| Meadowfield Kitchen CIC | Hospitality | 2026 |
| Meal Moments Ltd | Information & communication | 2025 |
| Mebia Services Ltd | Other services | 2025 |
| Mebin Enterprse Ltd | Real estate | 2023 |
| Med-Stats Ltd | Other services | 2021 |
| MED2AI Ltd | Professional & scientific | 2025 |
| Medforceai Limited | Health & social care | 2025 |
| Mediacycle Ltd | Information & communication | 2024 |
| Mediafield Global Ltd | Information & communication | 2024 |
| Medical Technologies Corporation LLP | | 2011 |
| Medico Dinheiro Ltd | Wholesale & retail | 2024 |
| Medieval Store Ltd | Wholesale & retail | 2026 |
| Medilayer Healthcare Ltd | Wholesale & retail | 2017 |
| Medinayoung Property Group Limited | Real estate | 2024 |
| Medius House Marketing Ltd | Administrative & support | 2018 |
| Mediverse Digital Limited | Professional & scientific | 2025 |
| Medmal Consulting Ltd | Professional & scientific | 2020 |
| Medmal Ltd | Professional & scientific | 2019 |
| Medovate Limited | Professional & scientific | 2017 |
| Medrent Holdings Ltd | Wholesale & retail | 2025 |
| Medusa Services Ltd | Wholesale & retail | 2025 |
| Meerut Trading Company Ltd | Manufacturing | 2024 |
| Meflyfm Ltd | Wholesale & retail | 2024 |
| Megaitac Ltd | Wholesale & retail | 2026 |
| Megan's Place Ltd | Other services | 2021 |
| Megaplus Global Ltd | Wholesale & retail | 2023 |
| Melarkems Limited | Wholesale & retail | 2020 |
| Melbourne Green Homes Ltd | Real estate | 2026 |
| Melet Limited | Information & communication | 2017 |
| Melis Yachting Limited | Administrative & support | 2026 |
| MEM (UK) Limited | Information & communication | 2008 |
| Memory Card Arcade Limited | Information & communication | 2025 |
| Mena Knows Ltd | Wholesale & retail | 2021 |
| Mendist Ltd | Information & communication | 2023 |
| Mendre Ltd | Other services | 2026 |