| MA Trader PVT Limited | Wholesale & retail | 2023 |
| MA Wholesale Tyre Limited | Manufacturing | 2025 |
| Mabele Dawit Limited | Real estate | 2025 |
| Mabo Capital Group Ltd | Financial services | 2025 |
| Mabzys Kitchens Ltd | Hospitality | 2017 |
| MAC Retail Limited | Wholesale & retail | 2011 |
| MAC Wise Ltd | Professional & scientific | 2025 |
| Macans Global Services Limited | Mining & quarrying | 2025 |
| Macclesfield Nominees Ltd | Extraterritorial | 2017 |
| Macclesfield Nominees NO 2 Ltd | Extraterritorial | 2017 |
| Mach Developments Limited | Real estate | 2018 |
| Machzikei Hadass Burial Board Ltd | Other services | 2023 |
| Machzikei Hadass Community Services Ltd | Other services | 2013 |
| Machzikei Hadass Kashrus Ltd | Other services | 2022 |
| MACK18 Ltd | Construction | 2024 |
| Macys Surgery Ltd | Health & social care | 2025 |
| Mad&Insicily Ltd | Hospitality | 2018 |
| Madalena Limited | Hospitality | 2021 |
| Made at Home (UK) Limited | Real estate | 2008 |
| Made IT Together Limited | Professional & scientific | 2022 |
| Made Product Development Ltd | Professional & scientific | 2013 |
| Madichie & Company Ltd | Real estate | 2020 |
| Madina Traders Ltd | Administrative & support | 2018 |
| Madryn Street 2 SPV Limited | Construction | 2014 |
| Madryn Street 3 SPV Limited | Real estate | 2024 |
| Madryn Street Investment Co Limited | Real estate | 2017 |
| Madryn Street SPV Ltd | Construction | 2016 |
| Maduraikaran Limited | Hospitality | 2022 |
| Magic of Nature (London) Limited | Manufacturing | 2016 |
| Magic PIE Limited | Construction | 2019 |
| Magic Printing Boutique Limited | Wholesale & retail | 2020 |
| Magical Moments Limited | Health & social care | 2011 |
| Magid Residential Ltd | Real estate | 2023 |
| Magma Digital Solutions Ltd | Information & communication | 2025 |
| Magnatick Estates Limited | Real estate | 2017 |
| Magnetic Light Ltd | Information & communication | 2024 |
| Magnetic Limited | Real estate | 2011 |
| Magnify Studio Ltd | Arts & recreation | 2021 |
| Magniv Ltd | Hospitality | 2025 |
| Mago Kensington Holdco 2 Ltd | Financial services | 2025 |
| Mago Kensington Holdco Ltd | Financial services | 2025 |
| Mago Kensington Leasehold Ltd | Real estate | 2025 |
| Mago Kensington Limited | Real estate | 2025 |
| Mago Kensington Residential Limited | Real estate | 2025 |
| Magyar Kuria Building Services Limited | Construction | 2019 |
| Mahadev Shivaya Shivam 369 Ltd | Hospitality | 2021 |
| Mahon Ground & Build Ltd | Construction | 2026 |
| Maid 4 U (Commercial) Limited | Administrative & support | 2019 |
| Maid the App Limited | Other services | 2017 |
| Maida Grill House Ltd | Hospitality | 2021 |
| Maidstone Challenger Limited | Extraterritorial | 2021 |
| Maidstone Estates Ltd | Other services | 2018 |
| Maidstone Solutions Limited | Extraterritorial | 2022 |
| Mainline (2007) Limited | Wholesale & retail | 2007 |
| Mainline Taxi Holdings Limited | Financial services | 2017 |
| Maintenance Solutions 24/6 Ltd | Construction | 2017 |
| MAINTENANCE22 Limited | Other services | 2026 |
| Mais Brasil Market Limited | Wholesale & retail | 2019 |
| Maison Maria Limited | Wholesale & retail | 2025 |
| Maison Minuit Ltd | Wholesale & retail | 2025 |
| Maison Voyage Ltd | Transport & logistics | 2025 |
| Maitituo Trade Ltd | Wholesale & retail | 2025 |
| Major Transport Solutions Ltd | Transport & logistics | 2022 |
| Major Trauma Support Partnership Limited | Health & social care | 2015 |
| MAK Associates Manchester Ltd | Real estate | 2017 |
| Makay Financial Services Ltd | Real estate | 2012 |
| Makay’S Creative Concept Ltd | Manufacturing | 2025 |
| Make Like a Tree Productions Limited | Information & communication | 2024 |
| Make My Packaging Ltd | Wholesale & retail | 2016 |
| Maker and Creator Ltd | Manufacturing | 2024 |
| Makers Quarter Ltd | Manufacturing | 2017 |
| Makol Global Consult Limited | Real estate | 2024 |
| Malakholdings Ltd | Real estate | 2024 |
| Malay Home Limited | Hospitality | 2023 |
| Malcolm Hill Associates Ltd | Manufacturing | 2014 |
| Malik Mart Limited | Wholesale & retail | 2024 |
| Malkys Limited | Professional & scientific | 2017 |
| Mall Group Ltd | Real estate | 2025 |
| Mall Group One Ltd | Real estate | 2026 |
| Mallkis Limited | Information & communication | 2025 |
| Mallu Butcher Manchester Limited | Wholesale & retail | 2025 |
| Malvern Charles Ltd | Transport & logistics | 2025 |
| MAM Consulting Limited | Hospitality | 2024 |
| Maman Lady Ltd | Wholesale & retail | 2026 |
| Mamar Mordche Ltd | Real estate | 2023 |
| Mamela Global Ltd | Hospitality | 2025 |
| Mamoon Baby Limited | Manufacturing | 2020 |
| Mams Group Ltd | Administrative & support | 2025 |
| Mamucium Scientific Ltd | Professional & scientific | 2023 |
| MAN and Van the App Limited | Administrative & support | 2017 |
| Mana Restaurant Group Ltd | Hospitality | 2018 |
| Management and Estates Limited | Real estate | 2024 |
| Management Solution Partners Limited | Professional & scientific | 1996 |
| Managestate Limited | Real estate | 2009 |
| Manah Church Ltd | Other services | 2022 |
| Manah Store Ltd | Wholesale & retail | 2025 |
| Manc House Ltd | Extraterritorial | 2019 |
| Mancfurs Ltd | Other services | 2025 |
| Manches Services Limited | Professional & scientific | 2026 |
| Manchester Accountancy Services Limited | Professional & scientific | 2017 |