| Matt Ward Services Limited | Other services | 2015 |
| Mattandcosimo Ltd | Hospitality | 2026 |
| Matthew James Furniture Ltd | Manufacturing | 2022 |
| Matthew James Handcrafted Furniture Ltd | Manufacturing | 2025 |
| Matthew Kiss Development Ltd | Information & communication | 2024 |
| Matthew Kitchen BDS Ltd | Health & social care | 2022 |
| Matthews Group Developments Limited | Real estate | 2022 |
| Matthorpe Holdings Ltd | Financial services | 2024 |
| Matw UK Ltd | Health & social care | 2023 |
| Maurice KAY Property Developments & Lettings Ltd | Real estate | 2022 |
| Mavericks Group Limited | Information & communication | 2018 |
| Mavericks Hospitality Ltd | Hospitality | 2022 |
| Maxbo Entertainments Ltd | Administrative & support | 2023 |
| Maxdemian Ltd | Construction | 2023 |
| Maxi Business Solutions Ltd | Administrative & support | 2020 |
| Maxi Rentals Limited | Real estate | 2008 |
| Maxim Storm Ltd | Financial services | 2025 |
| Maximise Textiles Ltd | Wholesale & retail | 2018 |
| Maximum Careplus Limited | Health & social care | 2014 |
| Maxpol Limited | Wholesale & retail | 2022 |
| Maxwell & Partners Ltd | Wholesale & retail | 2024 |
| Maya & Noah Ltd | Health & social care | 2025 |
| Maya Electricals Ltd | Construction | 2025 |
| Maya Law Ltd | Professional & scientific | 2017 |
| Maya NW Ltd | Real estate | 2020 |
| Maybach Interior Group Ltd | Construction | 2020 |
| Maybach Investments Ltd | Real estate | 2022 |
| Mayer Electrics Ltd | Construction | 2018 |
| Mayers Lettings Limited | Real estate | 2022 |
| Mayfair 888 Ltd | Hospitality | 2024 |
| Mayfair Delux Ltd | Real estate | 2025 |
| Mayfair Incorporation Limited | Administrative & support | 2020 |
| Mayfair Land Investments Ltd | Real estate | 2018 |
| Mayfair Properties (Manchester) Limited | Real estate | 2014 |
| Mayfair Property Investments Ltd | Real estate | 2017 |
| Mayfair Textiles Ltd | Wholesale & retail | 2024 |
| Mayflower Land Holdings Limited | Real estate | 2005 |
| Mayflower Regent Properties Limited | Real estate | 2025 |
| Mayglobal Ltd | Wholesale & retail | 2025 |
| Mayor Mpharm Services Ltd | Health & social care | 2017 |
| Maypole Care Limited | Health & social care | 2020 |
| Maysa Consultancy Limited | Professional & scientific | 2021 |
| Maysand Holdings Limited | Professional & scientific | 2003 |
| Maysand Stonemasonry Limited | Extraterritorial | 2020 |
| MAZ Transport Ltd | Transport & logistics | 2026 |
| Mazstore Ltd | Wholesale & retail | 2026 |
| Mazzo Restaurant Ltd | Hospitality | 2026 |
| Maéli Ltd | Wholesale & retail | 2024 |
| MB Building M & L Ltd | Construction | 2022 |
| MB BUS Glazing Limited | Construction | 2018 |
| MB Consultancy Group Ltd | Professional & scientific | 2025 |
| MB Takeaway Ltd | Hospitality | 2020 |
| MB3 Technical Ltd | Extraterritorial | 2025 |
| MBC Autobody Ltd | Wholesale & retail | 2025 |
| MBC Holdings (NW) Ltd | Financial services | 2021 |
| MBF Holdings Ltd | Other services | 2021 |
| MBG Propco Ltd | Real estate | 2024 |
| MBK Properties Northwest Ltd | Real estate | 2022 |
| MBM MCR Limited | Other services | 2025 |
| MBR Pharma Ltd | Health & social care | 2023 |
| MC Aesthetics (Birmingham) Ltd | Other services | 2018 |
| MC Aesthetics (Leeds) Ltd | Other services | 2018 |
| MC Aesthetics Limited | Other services | 2017 |
| MC Aesthetics Training Ltd | Health & social care | 2018 |
| MC Medicus Limited | Health & social care | 2015 |
| MC Move Management Ltd | Administrative & support | 2020 |
| MC Recruitment Limited | Arts & recreation | 2019 |
| MC Structural Engineers Ltd. | Professional & scientific | 2013 |
| Mcabduls Ltd | Hospitality | 2009 |
| Mcabduls Takeaway Ltd | Extraterritorial | 2011 |
| Mcandrew Holdings Ltd | Administrative & support | 2024 |
| MCB Rentals Ltd | Real estate | 2023 |
| MCC Healthcare Limited | Wholesale & retail | 2013 |
| Mccarthy Shanks Limited | Professional & scientific | 2000 |
| Mccoys Services (Northwest) Limited | Wholesale & retail | 2008 |
| Mcculloch Estates Ltd | Real estate | 2026 |
| Mcculloch Services Limited | Real estate | 2017 |
| Mcculloch Trading Ltd | Wholesale & retail | 2025 |
| Mcdermotts Memorials Limited | Other services | 2024 |
| MCE Mortgages Ltd | Financial services | 2020 |
| Mcentric Digital UK Ltd | Professional & scientific | 2019 |
| Mcgowan Installations UK Ltd | Construction | 2018 |
| Mcgs Properties Ltd | Real estate | 2025 |
| MCL Catering Ltd | Hospitality | 2024 |
| Mcla Development Group Limited | Real estate | 2024 |
| Mclaren Installations NW Limited | Construction | 2025 |
| Mclean Cyber Consultancy Limited | Information & communication | 2023 |
| MCM Conveyor Systems Limited | Professional & scientific | 1999 |
| MCM Investment Properties Ltd | Real estate | 2017 |
| MCR Automotive Ltd | Wholesale & retail | 2023 |
| MCR BEE Drivers Ltd | Transport & logistics | 2019 |
| MCR CH Cars Ltd | Wholesale & retail | 2023 |
| MCR CH Properties Ltd | Construction | 2023 |
| MCR Dens Developments Limited | Construction | 2023 |
| MCR Dens East Ltd | Real estate | 2024 |
| MCR Dens North Ltd | Real estate | 2024 |
| MCR Dens South Ltd | Real estate | 2024 |
| MCR Dens West Ltd | Real estate | 2024 |
| MCR Facilities Management Ltd | Administrative & support | 2025 |
| MCR Imports Ltd | Wholesale & retail | 2026 |