| Mavrek Properties Holding Limited | Real estate | 2021 |
| Mavrek Properties Limited | Real estate | 2021 |
| Mavrick Holdings Ltd | Financial services | 2021 |
| Mavro Group Ltd | Financial services | 2025 |
| MAW Motors Ltd | Wholesale & retail | 2025 |
| Mawby & King,Limited | Manufacturing | 1937 |
| Mawby & Sons Limited | Construction | 2018 |
| Mawejocelyne Ltd | Health & social care | 2019 |
| MAX Builders T/A R.A.G.E. Ltd | Construction | 2025 |
| MAX Cleaners & Maintenance Limited | Administrative & support | 2006 |
| MAX Energy Holdings Limited | Construction | 2020 |
| MAX Energy Ltd | Construction | 2014 |
| MAX Energy Newco Limited | Administrative & support | 2017 |
| MAX Energy Solar Limited | Construction | 2015 |
| MAX Market Ltd | Wholesale & retail | 2024 |
| MAX Mart Convenience Ltd | Wholesale & retail | 2025 |
| MAX Mart Plus Limited | Wholesale & retail | 2025 |
| MAX Maya Property Ltd | Real estate | 2021 |
| MAX North Property Services Ltd | Construction | 2023 |
| MAX Render Ltd | Extraterritorial | 2015 |
| MAX Renewables Limited | Energy | 2017 |
| MAX Smart Contractors Limited | Construction | 2021 |
| MAX Smart Properties Limited | Real estate | 2025 |
| MAX Tats Ltd | Other services | 2019 |
| MAX TV Limited | Extraterritorial | 2003 |
| MAX Utilities UK Ltd | Construction | 2022 |
| MAX Vehicle Logistics Limited | Other services | 2014 |
| Max-Ron Limited | Manufacturing | 2025 |
| Maxaura Global Ltd | Wholesale & retail | 2026 |
| Maxdex Trading Ltd | Wholesale & retail | 2012 |
| Maxgroup LP | | 2017 |
| Maxi Food Rugby Ltd | Wholesale & retail | 2024 |
| Maxi Group Property Ltd | Real estate | 2021 |
| Maxi Property Construction Limited | Construction | 2019 |
| Maxi Property Developments Limited | Construction | 2002 |
| Maxi Property Management 2018 Limited | Financial services | 2018 |
| Maxi Property Management Limited | Real estate | 2014 |
| Maxi Sustainable Agriculture Limited | Agriculture & fishing | 2021 |
| Maxiion Ltd | Information & communication | 2024 |
| Maxim Debt Collections Ltd | Administrative & support | 2020 |
| Maxim Life Limited | Hospitality | 2026 |
| Maximised Assets Ltd | Real estate | 2025 |
| Maxims Supermarket Ltd | Wholesale & retail | 2020 |
| Maximum Craft Designs Ltd | Wholesale & retail | 2025 |
| Maximum Sales Limited | Wholesale & retail | 1990 |
| Maximus 777 Ltd | Transport & logistics | 2022 |
| Maximus FM Limited | Real estate | 2018 |
| Maximus IQ Developments Limited | Real estate | 2006 |
| Maximus Property Group Limited | Real estate | 2021 |
| Maxin Chicken Ltd | Hospitality | 2019 |
| Maxknit Fabrics Limited | Wholesale & retail | 1978 |
| Maxlite Ltd | Construction | 2014 |
| Maxo Homes Ltd | Construction | 2024 |
| Maxshow Limited | Wholesale & retail | 2006 |
| Maxsprint Ltd | Extraterritorial | 2016 |
| Maxur Limited | Professional & scientific | 2025 |
| Maxwell 6 Ltd | Transport & logistics | 2015 |
| Maxwell Learning Ltd | Information & communication | 2023 |
| Maxwell Manufacturing Improvements Ltd | Professional & scientific | 2017 |
| MAY & SON Landscapes Ltd | Administrative & support | 2019 |
| MAY Bless Limited | Information & communication | 2022 |
| MAY Modesty Ltd | Manufacturing | 2020 |
| MAY Professional Services Limited | Professional & scientific | 2015 |
| MAY Properties Midlands Ltd | Real estate | 2022 |
| May's Hub Ltd | Administrative & support | 2017 |
| May's Property Hub Ltd | Real estate | 2020 |
| Maya Autos Limited | Wholesale & retail | 2017 |
| Maya Battery Factory Ltd | Wholesale & retail | 2025 |
| Maya Construction Services Ltd | Construction | 2019 |
| Maya Digital Consulting Ltd | Professional & scientific | 2023 |
| Maya Land Development Ltd | Construction | 2024 |
| Mayaa Group Ltd | Wholesale & retail | 2023 |
| Mayan Limited | Real estate | 2009 |
| Maybach Management Limited | Administrative & support | 2016 |
| Maye Medical Skin Limited | Health & social care | 2025 |
| Mayes Property Group Ltd | Real estate | 2026 |
| Mayfair ALL in 1 Ltd | Administrative & support | 2023 |
| Mayfair Developments (Beyton) Ltd | Construction | 2024 |
| Mayfair Developments (Leicester) Ltd | Construction | 2012 |
| Mayfair Developments (Newmarket) Ltd | Hospitality | 2023 |
| Mayfair International Travel & Tours Ltd | Administrative & support | 2018 |
| Mayfair Motors Ltd | Wholesale & retail | 2019 |
| Mayfair Photography Ltd | Other services | 2005 |
| Mayfield & Company (Accountants) Limited | Professional & scientific | 1999 |
| Mayfield Assets Ltd | Construction | 2025 |
| Mayfield Insurance Services Limited | Professional & scientific | 2002 |
| Mayfield Special Projects Limited | Construction | 2016 |
| Mayflower Care Limited | Health & social care | 2004 |
| Mayflower Trustees Limited | Professional & scientific | 2008 |
| Mayil Retailers Ltd | Wholesale & retail | 2025 |
| Mayin Investments Ltd | Professional & scientific | 2018 |
| Maylan Engineering Limited | Manufacturing | 1988 |
| Maylan Limited | Manufacturing | 2010 |
| Mayle Ltd | Transport & logistics | 2024 |
| Maylorgat Limited | Real estate | 2017 |
| Maynard Property Investments Ltd | Real estate | 2019 |
| Maynard's Building Maintenance Ltd | Construction | 2025 |
| Mayne Sawyer Composites Ltd | Professional & scientific | 2019 |
| Mayne Securities Limited | Financial services | 1991 |
| Mayny Transport Limited | Transport & logistics | 2007 |