| M&K Aleks Ltd | Real estate | 2017 |
| M&M Pannu Logistics Ltd | Transport & logistics | 2026 |
| M&N Beauty World Salon Ltd | Other services | 2025 |
| M.A.K.K. Building Ltd | Construction | 2014 |
| M.B City Building & Maintenance Services Limited | Construction | 2025 |
| M.B City Plumbing & Heating Solutions Ltd | Construction | 2018 |
| M.I.G. Services Ltd | Administrative & support | 2023 |
| M.O.N (Mother of Nations) Limited | Information & communication | 2019 |
| M4 Telecom Ltd | Information & communication | 2021 |
| MA Design Limited | Professional & scientific | 2017 |
| MA Marque Ltd | Wholesale & retail | 2018 |
| MA Shwe KIT Limited | Transport & logistics | 2024 |
| Mabela PVT Ltd | Health & social care | 2008 |
| Mabell Construction Ltd | Construction | 2022 |
| Maberic Ltd | Hospitality | 2020 |
| MAC & Phones Ltd | Wholesale & retail | 2019 |
| MAC 365 Ltd | Transport & logistics | 2019 |
| Mack Grips Limited | Information & communication | 2019 |
| Macosa Studios Ltd | Information & communication | 2023 |
| Macro IT Solutions Ltd | Information & communication | 2025 |
| Madeley Assets Limited | Real estate | 2025 |
| Madina Munawara Limited | Health & social care | 2021 |
| Mager Group Limited | Real estate | 2016 |
| Magic Brush London Ltd | Construction | 2025 |
| Magic Rollers Painting Limited | Construction | 2024 |
| Magicrom Limited | Information & communication | 2017 |
| Magistrates Apartments Limited | Real estate | 2025 |
| Magnetic Clinic of Beauty Ltd | Other services | 2016 |
| Magnus Consultancy Ltd | Information & communication | 2026 |
| Maha Greek Ltd | Hospitality | 2025 |
| Maharaja Infotech Limited | Information & communication | 2025 |
| Maharaja's House Ltd | Manufacturing | 2023 |
| Maids in Bliss Ltd | Administrative & support | 2022 |
| Maiko Ltd | Construction | 2019 |
| Mainfreight UK Ltd | Transport & logistics | 2016 |
| Mainline Events Ltd | Professional & scientific | 2019 |
| Maiwand Restaurant Ltd | Hospitality | 2018 |
| MAJ Transport Consultancy Ltd | Transport & logistics | 2024 |
| Majestic Fine Food Ltd | Hospitality | 2024 |
| Major Transport & Logistics Limited | Transport & logistics | 2025 |
| Makeovers by Sara Ltd | Other services | 2024 |
| Makkai Trading Ltd | Wholesale & retail | 2024 |
| Mako Carpet & Flooring Ltd | Construction | 2025 |
| Malhi Founding Partners Limited | Transport & logistics | 2026 |
| Malokaj Cleaning Ltd | Administrative & support | 2022 |
| Malvern & Raddinton Limited | Wholesale & retail | 2023 |
| Malwa Barbers Ltd | Other services | 2025 |
| Mama DEE Catering & Services Ltd | Hospitality | 2025 |
| MAMIK27 Limited | Hospitality | 2026 |
| Mamuzai Limited | Wholesale & retail | 2026 |
| MAN Real Estates Ltd | Real estate | 2023 |
| Man&Chisel Ltd | Manufacturing | 2025 |
| Manadan Limited | Health & social care | 2019 |
| Management Consultancy @56 Ltd. | Professional & scientific | 2015 |
| Mangat Developers Limited | Construction | 2018 |
| Manheer Logistics Ltd | Transport & logistics | 2026 |
| Mani's World Limited | Other services | 2022 |
| Manim Ltd | Wholesale & retail | 2013 |
| Manishfoods Ltd | Hospitality | 2025 |
| Mann Accounting Services Ltd | Professional & scientific | 2025 |
| Mann Investments Limited | Real estate | 2007 |
| Manor Mead Construction Limited | Construction | 2024 |
| Manveet Ltd | Transport & logistics | 2026 |
| Manyaman (UK) Limited | Manufacturing | 2019 |
| Maple IT Consultants Ltd | Information & communication | 2016 |
| Maps Services Ltd | Transport & logistics | 2018 |
| MAR & RO Building Ltd | Construction | 2026 |
| MAR Assets Ltd | Real estate | 2025 |
| Marathon Promotions Limited | Hospitality | 2025 |
| Marc Weymann Ltd | Professional & scientific | 2012 |
| Marcinpresents Limited | Professional & scientific | 2023 |
| Maria 73 Ltd | Administrative & support | 2020 |
| Mariana Lounge Ltd | Wholesale & retail | 2023 |
| Marinov Trade Limited | Wholesale & retail | 2019 |
| Mark Harding Design and Build Limited | Construction | 2014 |
| Market I Source Limited | Professional & scientific | 2014 |
| Marksald Company Limited | Health & social care | 2022 |
| Marriott Close (22, 24, 26, 28 & 42, 44, 46 & 48) Management Limited | Real estate | 2008 |
| Mars Tech Limited | Extraterritorial | 2013 |
| Maruti IT Consultancy Ltd | Information & communication | 2017 |
| Marvel Meeting Limited | Wholesale & retail | 2025 |
| Marvellous Collaboration Limited | Real estate | 2020 |
| Marvellous Home Cleaning Services Ltd | Administrative & support | 2005 |
| Marwin Accountancy Ltd | Professional & scientific | 2025 |
| MAS IT Solutions Ltd | Information & communication | 2011 |
| MAS Learning Driving Instructor Limited | Education | 2022 |
| Masco Construction Ltd | Construction | 2022 |
| Mascot Productions Ltd | Education | 2011 |
| Masloch Building & Construction Ltd | Construction | 2020 |
| Masonry Stonework Ltd | Construction | 2025 |
| Masro Construction Ltd. | Construction | 2015 |
| Masro Design Ltd. | Construction | 2015 |
| Masro Group Ltd. | Construction | 2015 |
| Masro Homes Ltd. | Other services | 2015 |
| Masro Steel Ltd. | Construction | 2015 |
| Mastarrec Limited | Administrative & support | 2025 |
| Master Building Constructions (UK) Ltd | Construction | 2019 |
| Master Wong T/A Limited | Hospitality | 2018 |
| Mat's Group Limited | Construction | 2019 |
| Matchmakers Property Limited | Real estate | 2016 |