| Meetusvr Ltd | Information & communication | 2023 |
| Mega Sounds Ltd | Arts & recreation | 2024 |
| Mega Waste Removal Limited | Water & waste | 2023 |
| Megafox Consulting Limited | Information & communication | 2025 |
| Megalabels Ltd | Wholesale & retail | 2018 |
| Megamatch Limited | Professional & scientific | 2008 |
| Megan and Jade Limited | Wholesale & retail | 2019 |
| Megapartyexperience Ltd | Arts & recreation | 2024 |
| Megaplast (UK) Ltd. | Wholesale & retail | 2001 |
| Megatron Events Ltd | Administrative & support | 2025 |
| Megatron Global Ltd | Administrative & support | 2017 |
| Megaw Coffee Ltd | Hospitality | 2019 |
| Mehaks Catering Limited | Hospitality | 2019 |
| Mehdi Sculptures (Special Projects) Limited | Arts & recreation | 2014 |
| Mehdi Sculptures Limited | Arts & recreation | 2011 |
| Mehoo Ltd | Wholesale & retail | 2025 |
| Mehring Books Limited | Manufacturing | 1998 |
| Mehta Group of Ltd | Financial services | 2026 |
| MEI Brakes Limited | Wholesale & retail | 1998 |
| MEI SHI Yuan Limited | Hospitality | 2024 |
| MEI Technology Ltd | Information & communication | 2026 |
| MEI Ying Spa Limited | Health & social care | 2025 |
| Meimoon Tian Limited | Hospitality | 2025 |
| Meisterwood Management Ltd | Extraterritorial | 2017 |
| MEJ Project Management and Consultancy Ltd | Professional & scientific | 2016 |
| MEK THI SEN at Home Ltd | Real estate | 2023 |
| Meka Wood Co Limited | Manufacturing | 2026 |
| MEL Holmes Design Limited | Arts & recreation | 2007 |
| Mela Awet Training and Consultancy Ltd | Professional & scientific | 2022 |
| Mela Homes Ltd | Real estate | 2020 |
| Meladore Limited | Wholesale & retail | 2004 |
| Melbourne Liberal Club & Public Hall Company Limited,(The) | Hospitality | 1889 |
| Melbourne Place Limited | Real estate | 2001 |
| Melbourne Services Limited | Professional & scientific | 1965 |
| Melco Products Ltd | Wholesale & retail | 2015 |
| Meld Impact Ltd | Professional & scientific | 2024 |
| Meli Construction Limited | Construction | 2023 |
| Melling, Ridgeway & Partners Limited | Professional & scientific | 2003 |
| Mellors Care Ltd | Administrative & support | 2024 |
| Melmar Property Limited | Real estate | 2024 |
| Melody Investco Ltd | Real estate | 2015 |
| Melodys Consulting Limited | Professional & scientific | 2021 |
| Melorhall Limited | Professional & scientific | 1999 |
| Melrose Family Investments Limited | Financial services | 2020 |
| Melsharifmedical Ltd | Health & social care | 2024 |
| Melteg Healthcare Ltd | Health & social care | 2021 |
| Melton Energy Ltd | Professional & scientific | 2007 |
| Melville & Staley Limited | Construction | 2014 |
| Melvyn Carr Limited | Manufacturing | 1977 |
| Memento Concepts Ltd. | Information & communication | 2014 |
| Memi's Coffee House Ltd | Hospitality | 2024 |
| Memo Warriors Ltd | Arts & recreation | 2024 |
| Memoir Escapes Ltd | Professional & scientific | 2024 |
| Memories MAY Vary Ltd | Professional & scientific | 2022 |
| Memory Dance Ltd. | Information & communication | 2019 |
| Memosyne Memory Clinic Limited | Health & social care | 2024 |
| Memple Technologies Ltd | Information & communication | 2026 |
| Memry Corporation Limited | Information & communication | 2025 |
| MEN at Porters Limited | Other services | 2011 |
| Men's Hair Industry Limited | Other services | 2016 |
| Menakuru Freelance Limited | Real estate | 2009 |
| Menakuru Holdings Limited | Real estate | 2019 |
| Mench Limited | Manufacturing | 2014 |
| Mend Your Head Limited | Wholesale & retail | 2021 |
| Mendasaw Limited | Manufacturing | 2011 |
| Mended Ltd | Construction | 2024 |
| Meng Limited | Wholesale & retail | 2025 |
| Mengi Limited | Information & communication | 2013 |
| Mens Circle CIC | Health & social care | 2021 |
| Mentholmans Limited | Hospitality | 2012 |
| Mentor Model Agency Ltd | Administrative & support | 2013 |
| Menzies Engineering Consultancy Ltd | Administrative & support | 2022 |
| Meow LEO Ltd | Wholesale & retail | 2023 |
| Meow Music Limited | Arts & recreation | 2020 |
| Meps International Limited | Information & communication | 1986 |
| Meqon Ltd | Manufacturing | 2025 |
| Meqs Consultancy Ltd | Professional & scientific | 2018 |
| Merai Limited | Wholesale & retail | 2019 |
| Meral Anas Ltd | Transport & logistics | 2024 |
| Merali Lettings Ltd | Real estate | 2008 |
| Merali Property Ltd | Real estate | 2011 |
| Merbeck Consulting Limited | Professional & scientific | 2010 |
| Merc Evan Limited | Wholesale & retail | 2017 |
| Merchant Chambers Limited | Real estate | 2015 |
| Merchant of Heartwood Ltd. | Manufacturing | 2026 |
| Merching About Ltd | Arts & recreation | 2024 |
| Merchly Limited | Wholesale & retail | 2025 |
| Merchmonkey Limited | Wholesale & retail | 2022 |
| Merchnova Limited | Wholesale & retail | 2025 |
| Mercia Breaks Limited | Real estate | 2024 |
| Mercia Imaging Ltd | Health & social care | 2020 |
| Mercia Learning Trust | Education | 2012 |
| Mercia Memories Ltd | Real estate | 2021 |
| Mercia Motors Limited | Wholesale & retail | 2011 |
| Mercia Roofing Supplies Ltd | Administrative & support | 2017 |
| Mercian Travel & Tours Limited | Transport & logistics | 2000 |
| Mercol Products Limited | Manufacturing | 1960 |
| Mercurii Edge Limited | Information & communication | 2026 |
| Mercury Building Products Limited | Wholesale & retail | 2000 |
| Mercury Cabs Limited | Transport & logistics | 2018 |