| Mindspace Commerce Limited | Wholesale & retail | 2024 |
| Mindstreams Education Ltd | Education | 2023 |
| Mine Media Limited | Professional & scientific | 2018 |
| Ming's Oriental Food Limited | Hospitality | 2022 |
| Mini-Mart SM Ltd | Wholesale & retail | 2014 |
| Minibell Ltd | Wholesale & retail | 2026 |
| Ministry Wharf Management Limited | Administrative & support | 2010 |
| Minra Traders Limited | Hospitality | 2024 |
| Mint HW Ltd | Hospitality | 2024 |
| Mint Velvet Clothing Limited | Administrative & support | 2015 |
| Mint Velvet Europe Limited | Administrative & support | 2015 |
| Mint Velvet Fashion Limited | Administrative & support | 2015 |
| Mint Velvet Group Limited | Administrative & support | 2015 |
| Mint Velvet Holdings Limited | Administrative & support | 2015 |
| Mint Velvet International Limited | Administrative & support | 2015 |
| Mint Velvet Property Limited | Administrative & support | 2015 |
| Mint Velvet Retail Limited | Administrative & support | 2015 |
| Mint Velvet Services Limited | Administrative & support | 2015 |
| Mint Velvet Trading Limited | Administrative & support | 2015 |
| MIR Tax Tech Solutions Limited | Information & communication | 2014 |
| Miramash Ltd | Transport & logistics | 2025 |
| Mirco Innovations Ltd | Wholesale & retail | 2018 |
| Mirpur AK Jewellers Ltd | Wholesale & retail | 2025 |
| Misbourne River Estates Ltd | Construction | 2025 |
| Misbourne Riverside Club Ltd | Professional & scientific | 2026 |
| Misbourne RYE Maritime Ltd | Professional & scientific | 2018 |
| Mishki Ltd | Information & communication | 2021 |
| Misilo B&E Ltd. | Construction | 2018 |
| Missenden Abbey Limited | Hospitality | 1993 |
| Mission Cloud Limited | Information & communication | 2017 |
| Mission Impossible Window Cleaning Ltd | Administrative & support | 2022 |
| Mission Property Group Limited | Real estate | 2025 |
| Miti Build Ltd | Construction | 2019 |
| Miura Systems Limited | Manufacturing | 2008 |
| Mixed UP Productions Limited | Information & communication | 2007 |
| MJ Climate Solutions Ltd | Construction | 2025 |
| MJ Joiner Associates Limited | Wholesale & retail | 2005 |
| MJ Optical Solutions Ltd | Health & social care | 2023 |
| MJC Property Services Ltd | Information & communication | 2021 |
| MJF Property Group Ltd | Real estate | 2023 |
| MJJ Carpentry Ltd | Construction | 2016 |
| MJN Windows Limited | Construction | 2008 |
| MJW International Limited | Professional & scientific | 2026 |
| Mjwoodwards Ltd | Wholesale & retail | 2024 |
| MK Car Rental Limited | Administrative & support | 2023 |
| MK Systems Ltd | Information & communication | 2025 |
| Mk&J Care Ltd | Health & social care | 2022 |
| Mkjp Enterprises Limited | Real estate | 2024 |
| MKP Online Ltd | Wholesale & retail | 2025 |
| MKY Barbers Ltd | Other services | 2018 |
| ML Couriers Ltd | Transport & logistics | 2025 |
| MLB Carpentry & Joinery Ltd | Manufacturing | 2022 |
| Mlem Solutions UK Ltd | Professional & scientific | 2026 |
| MLY Property Ltd | Real estate | 2023 |
| MLZ Recruitment Ltd | Administrative & support | 2024 |
| MM Electrical Systems Ltd | Construction | 2026 |
| MM Investment Properties Ltd | Real estate | 2018 |
| MM Investments (NO. 1) Limited | Financial services | 2019 |
| Mmah Limited | Wholesale & retail | 2023 |
| Mmanagement Services Ltd | Wholesale & retail | 2016 |
| Mmarsh Private Limited | Wholesale & retail | 2020 |
| MMC Brickwork Ltd | Construction | 2022 |
| Mmdm Developments Limited | Other services | 2004 |
| Mmdm Investments Limited | Wholesale & retail | 2011 |
| Mmjk Ltd | Wholesale & retail | 2025 |
| MMM Europe Ltd | Information & communication | 2021 |
| MMP Associates Limited | Professional & scientific | 2011 |
| Mmra Properties Limited | Real estate | 2024 |
| Mmsound Limited | Information & communication | 2013 |
| Mmvd Properties Limited | Real estate | 2020 |
| Mmxxi Limited | Administrative & support | 2020 |
| Mncvb Limited | Information & communication | 2015 |
| Mnik Limited | Information & communication | 2015 |
| MNY Trading Ltd | Hospitality | 2023 |
| Moan Van Transport Ltd | Transport & logistics | 2015 |
| Mobil Tyre Fitt Ltd | Manufacturing | 2025 |
| Mobile & Web Ltd | Information & communication | 2011 |
| Mobile Market Technology Limited | Information & communication | 2015 |
| Mobile Tyre Bay Ltd | Wholesale & retail | 2023 |
| Mobile Tyre Services Ltd | Wholesale & retail | 2021 |
| Mobile Tyres 2 U Ltd | Wholesale & retail | 2010 |
| Modale Limited | Professional & scientific | 2024 |
| Modern Alchemy Ltd | Wholesale & retail | 2022 |
| Modmod Ltd | Wholesale & retail | 2025 |
| Modul-System International Ltd | Extraterritorial | 2004 |
| Modul-System Limited | Wholesale & retail | 1981 |
| Moggie Motel Ltd | Hospitality | 2013 |
| Mogul Home Improvements Limited | | 1973 |
| Mohammad Gulistan Khan & Co. Limited | Hospitality | 1982 |
| Mohammad Gulistan Khan Family Estates Limited | Administrative & support | 2003 |
| Mohammed Iqbal Properties Limited | Real estate | 2022 |
| Moldavite Properties Ltd | Real estate | 2026 |
| Mole Run Residents' Association Limited | Real estate | 1966 |
| Moli Music Limited | Information & communication | 2024 |
| Moliv Design and Build Ltd | Construction | 2016 |
| Molly Fiander Ltd | Professional & scientific | 2019 |
| Moment Studios Ltd | Professional & scientific | 2024 |
| Momentum Facilities Management Limited | Administrative & support | 2019 |
| Momo's Hair Ltd. | Other services | 2017 |
| Monaco Insurance Services Limited | Financial services | 2009 |