| Mediline Group Services Limited | Professional & scientific | 1986 |
| Mediline Supported Living Limited | Health & social care | 1986 |
| Medimess 2012 Limited | Health & social care | 2012 |
| Medina Woodcraft Limited | Manufacturing | 2006 |
| Mediterranean Gardens Ltd | Administrative & support | 2015 |
| Medivents Consulting Limited | Health & social care | 2016 |
| Medivest Holdings Ltd | Financial services | 2024 |
| Mediwell North West Ltd | Manufacturing | 2024 |
| Mediworx Ltd | Wholesale & retail | 2000 |
| Medjay Ltd | Wholesale & retail | 2023 |
| Medlicott Commercial Consulting Ltd | Financial services | 2025 |
| Medlife Homecare Ltd | Health & social care | 2020 |
| Medlock Diagnostics Ltd | Health & social care | 2024 |
| Medpire Limited | Wholesale & retail | 2020 |
| Medslim UK Limited | Health & social care | 2018 |
| Medusa Hospitality Ltd | Hospitality | 2018 |
| Medusa Liverpool Limited | Hospitality | 2025 |
| Medusa Outsourcing Ltd | Administrative & support | 2025 |
| Medusa Piercing Limited | Other services | 2020 |
| Medview Health Ltd | Health & social care | 2025 |
| MEE Properties Ltd | Real estate | 2025 |
| Meek Homes Ltd | Real estate | 2024 |
| Meenacarn Limited | Hospitality | 2018 |
| Meer Services Limited | Administrative & support | 2025 |
| Meet and Potato Ltd | Other services | 2010 |
| Meet Sean O'Neill Ltd | Professional & scientific | 2022 |
| Mega Ferry UK Limited | Extraterritorial | 2025 |
| Mega GM Ltd | Hospitality | 2026 |
| Mega Gyros Trafford Ltd | Hospitality | 2025 |
| Mega Produce Ltd | Wholesale & retail | 2019 |
| Mega Shop NW Ltd | Wholesale & retail | 2024 |
| Mega Transport UK Limited | Extraterritorial | 2025 |
| Mega Unique Touch Limited | Construction | 2025 |
| Megamind Limited | Hospitality | 1995 |
| Megan H Bolton Limited | Professional & scientific | 2022 |
| Megarad Ltd | Health & social care | 2021 |
| Megasol Ltd | Information & communication | 2011 |
| Megedi MAI Ltd | Construction | 2024 |
| Meggi Lashes Ltd | Wholesale & retail | 2020 |
| Meghna Limited | Real estate | 1981 |
| Megumi Sabo Ltd | Other services | 2026 |
| Mehar Shahzaib Ltd | Wholesale & retail | 2025 |
| Mehdi AI Consulting Limited | Information & communication | 2026 |
| Mehhi Limited | Construction | 2025 |
| Mehhii Ltd | Real estate | 2026 |
| Mehmet Flooring Limited | Construction | 2025 |
| Mehrabi Real Estate Ltd | Real estate | 2025 |
| Mehrozfarooq Limited | Wholesale & retail | 2025 |
| Mehrum Paco Super Market Limited | Wholesale & retail | 2025 |
| Mehta Property Group Ltd | Real estate | 2022 |
| MEI MEI (Liverpool) Limited | Hospitality | 2003 |
| Meij Renovations Ltd | Construction | 2025 |
| Meiqi Trade Limited | Wholesale & retail | 2025 |
| Meiru Wealth Ltd | Financial services | 2024 |
| Meiwei Noodle Bar Limited | Hospitality | 2024 |
| Meko Insights Ltd | Professional & scientific | 2023 |
| Mel&Kin Limited | Wholesale & retail | 2025 |
| Melanie Gale Limited | Professional & scientific | 2012 |
| Melavid Limited | Construction | 1976 |
| Melbourne Liverpool Ltd | Hospitality | 2024 |
| Melbourne Woods Partnership (Investments) Limited | Real estate | 1999 |
| Melbrooke M&E Limited | Other services | 2020 |
| Melbrooke Services Limited | Construction | 2020 |
| Melbrooke Telecommunications Limited | Other services | 2020 |
| Meld Bittr Ltd | Wholesale & retail | 2025 |
| Melena Abaya Ltd | Wholesale & retail | 2025 |
| Meley Services Limited | Financial services | 2024 |
| Melia Commercial Consulting Ltd | Professional & scientific | 2026 |
| Melia Ltd | Real estate | 2012 |
| Melia Medical Ltd | Education | 2025 |
| Melia-Moran Consulting Limited | Public administration | 2023 |
| Melinco Motorhomes Ltd | Wholesale & retail | 2026 |
| Melior Living UK Ltd | Real estate | 2023 |
| Meliora.Jfc Ltd | Construction | 2021 |
| Melissa Estates Ltd | Real estate | 2016 |
| Melius Capital Partners Ltd | Financial services | 2026 |
| Melius Commercial Finance Ltd | Financial services | 2020 |
| Melius Commercial Ltd | Financial services | 2018 |
| Melius Finance Ltd | Financial services | 2018 |
| Melling & Taubman Estates Limited | Real estate | 2017 |
| Melling Land Limited | Extraterritorial | 2016 |
| Mellior Construction Ltd | Construction | 2022 |
| Mellior Group Holdings Ltd | Financial services | 2022 |
| Mello Heating Limited | Construction | 2020 |
| Mello Nights Ltd | Hospitality | 2025 |
| Mellor Construction (NW) Limited | Construction | 2020 |
| Mellowtone Ltd | Administrative & support | 2013 |
| Melo Construction Services Limited | Construction | 2023 |
| Melodic Distraction Ltd. | Hospitality | 2015 |
| Melodic International Limited | Arts & recreation | 2025 |
| Melody Music Academy CIC | Information & communication | 2021 |
| Melody Pharma Ltd | Health & social care | 2024 |
| Melody Real Estate Ltd | Real estate | 2025 |
| Melonie Prebble Ltd | Health & social care | 2011 |
| Meloway Limited | Professional & scientific | 2025 |
| Melrose Court Rest Home Limited | Health & social care | 2005 |
| Melrose Park Management Company Limited | Households | 1999 |
| Melrow Ltd | Professional & scientific | 2020 |
| Melt Coffee Limited | Hospitality | 2020 |
| Melton Experience Ltd | Households | 2019 |