| Mega Electrical Ltd. | Construction | 2019 |
| Megan's Beauty Salon Limited | Other services | 2024 |
| Megfem Ltd | Health & social care | 2022 |
| Mehr Londis Management Limited | Wholesale & retail | 2011 |
| Mehr Londis Trading Limited | Wholesale & retail | 2011 |
| Meilleur AMI Ltd | Real estate | 2023 |
| Mel's Motors Ltd | Wholesale & retail | 2018 |
| Melaeon Health Data and Policy Ltd | Public administration | 2025 |
| Melana Investments Ltd | Real estate | 2025 |
| Melanie Tomlinson Design Ltd | Other services | 2021 |
| Meldons Property Limited | Real estate | 2014 |
| Mellor's Mutt's Ltd | Education | 2025 |
| Menard Polo Limited | Arts & recreation | 2019 |
| MEP Solutions (PVT.) Limited | Construction | 2024 |
| Meraj Properties Ltd | Real estate | 2023 |
| Mercanix Limited | Wholesale & retail | 2010 |
| Mercer & Mercer Ltd | Construction | 2009 |
| Mercurial Brewing Limited | Wholesale & retail | 2017 |
| Merial Limited | Manufacturing | 1997 |
| Meridian Manpower Healthcare Services Ltd | Administrative & support | 2024 |
| Meritas Developments Ltd | Professional & scientific | 2010 |
| Meritas Group Holdings Limited | Financial services | 2017 |
| Meritas Group Limited | Financial services | 2016 |
| Meritas Scientific Holdings Limited | Financial services | 2019 |
| Meritas Scientific Limited | Financial services | 2019 |
| Merlin Sameday Limited | Transport & logistics | 2014 |
| Mermemi Ltd | Health & social care | 2026 |
| Merriman & Associates Limited | Financial services | 2012 |
| Merryland Online Ltd | Education | 2024 |
| Mestec Limited | Information & communication | 2000 |
| Meta Mirror Technology Ltd | Information & communication | 2025 |
| Metro CPM Limited | Professional & scientific | 2018 |
| Metropolis BUS & Coach Ltd | Transport & logistics | 2013 |
| Meydan Consulting Ltd | Information & communication | 2014 |
| MG Building & Engineering Limited | Construction | 2016 |
| MG Commercial Ltd | Real estate | 2023 |
| MG HR Services Ltd | Administrative & support | 2012 |
| MG Maintenance Ltd | Administrative & support | 2020 |
| MG4 Foods Ltd | Hospitality | 2025 |
| MGA Maintenance Ltd | Wholesale & retail | 2022 |
| MGA SA Limited | Professional & scientific | 2015 |
| MGL Enterprises Holdings Ltd | Financial services | 2025 |
| MGQ Specialist Limited | Administrative & support | 2020 |
| Mgsx Limited | Real estate | 2025 |
| MHR Limited | Extraterritorial | 1996 |
| Mhsp Investments Ltd | Real estate | 2023 |
| MIA Victory Treasures Ltd | Extraterritorial | 2023 |
| Miageorge Developments Limited | Construction | 2025 |
| Micron Europe Limited | Manufacturing | 1989 |
| Microsap Limited | Information & communication | 2005 |
| Micyda Management Services Limited | Extraterritorial | 2013 |
| MID Lyfe Crysis Ltd | Hospitality | 2008 |
| Midas Consulting Limited | Professional & scientific | 1998 |
| Middlesex Investment Properties Limited | Real estate | 2017 |
| Mighty Mojo Media Ltd | Information & communication | 2025 |
| Mikail Kebab Limited | Hospitality | 2025 |
| Mikail Kebab Van Ltd | Hospitality | 2025 |
| Milan & Sagar Ltd | Health & social care | 2019 |
| Milan Entertainment Ltd | Arts & recreation | 2025 |
| Mileback Ltd | Information & communication | 2026 |
| Milestone Windows Ltd | Construction | 2007 |
| Millenium Ventures Ltd | Administrative & support | 2016 |
| Milligan & Son’S Flooring Specialists Ltd | Construction | 2022 |
| Milligans Barn Management Co Limited | Households | 2024 |
| Milly & MTJ Care and Support Ltd | Health & social care | 2022 |
| Miltec Security Ltd | Administrative & support | 2023 |
| Milton Independent Financial Advisers Limited | Financial services | 2004 |
| Mind and Strength Ltd | Public administration | 2021 |
| Mindfill Ltd | Wholesale & retail | 2020 |
| Minds Thrive Limited | Information & communication | 2022 |
| Mindset Boulevard Ltd | Health & social care | 2020 |
| Mindware Solutions Ltd | Information & communication | 2016 |
| Mini-Town Preparations Ltd | Wholesale & retail | 2023 |
| Minoru Place Residents Company Limited | Households | 2000 |
| Minter K Limited | Wholesale & retail | 2016 |
| Minty Corporation Ltd | Real estate | 2022 |
| Miranda Property Solutions Ltd | Real estate | 2025 |
| Mirror Food and Services Limited | Hospitality | 2025 |
| Mito Bloom Ltd | Wholesale & retail | 2025 |
| Mjda Limited | Hospitality | 2019 |
| MJG Estates Ltd | Real estate | 2024 |
| MJG Management & Investments Ltd | Real estate | 2023 |
| MJN Security Ltd | Administrative & support | 2023 |
| Mjolnir Landscaping Ltd | Administrative & support | 2026 |
| MJR Electrical Ltd | Manufacturing | 2017 |
| MK Electrical Engineering Limited | Construction | 2017 |
| Mkluczak Limited | Health & social care | 2022 |
| ML Gold and Bullion Ltd | Wholesale & retail | 2026 |
| ML Polo Limited | Arts & recreation | 2026 |
| Mljbc Limited | Health & social care | 2014 |
| MLM IT Solutions Ltd. | Information & communication | 2014 |
| Mlrnetworking Limited | Information & communication | 1999 |
| MM Gardening Limited | Administrative & support | 2015 |
| Mmas Construction Limited | Construction | 2013 |
| MMH Roofing & Property Services Ltd | Construction | 2026 |
| MML Consultancy Ltd | Professional & scientific | 2024 |
| MN Post Limited | Information & communication | 2016 |
| MNT Solutions Limited | Transport & logistics | 2014 |
| Mobifixx Ltd | Wholesale & retail | 2026 |
| Mochanic Ltd | Wholesale & retail | 2019 |