| MAX Kirk Ltd | Financial services | 2008 |
| MAX Mobile Nottingham Ltd | Wholesale & retail | 2023 |
| MAX Plus Ltd | Other services | 2024 |
| MAX Properties (Magdala) LLP | | 2020 |
| MAX Transport Services Ltd | Transport & logistics | 2025 |
| MAX Yannis Delivery Ltd | Transport & logistics | 2021 |
| Maxdent Health Limited | Health & social care | 2015 |
| Maxdent Residentials Limited | Real estate | 2023 |
| Maxdent Supplies Limited | Wholesale & retail | 2023 |
| Maxheat Limited | Construction | 2015 |
| Maxim Consultants Ltd | Households | 2025 |
| Maximising Your Potential Limited | Professional & scientific | 2019 |
| Maximo Trading UK Ltd | Wholesale & retail | 2021 |
| Maximum Builders Ltd | Construction | 2024 |
| Maximum Consultants Limited | Financial services | 2019 |
| Maximum Maintenance Limited | Manufacturing | 2014 |
| Maximum Property (Nottingham) Ltd | Real estate | 2021 |
| Maximus Corp Ltd | Wholesale & retail | 2024 |
| Maximus Corp Ventures Ltd | Financial services | 2025 |
| Maximus Projects Limited | Administrative & support | 2008 |
| Maxiz Ltd | Wholesale & retail | 2023 |
| Maxod Holdings Ltd | Professional & scientific | 2025 |
| Maxsun Holding Limited | Information & communication | 2019 |
| Maxted Morrison & Co. Limited | Extraterritorial | 1979 |
| Maxwell Brookes Consulting Group Limited | Information & communication | 2016 |
| Maxwell Traders Ltd | Wholesale & retail | 2018 |
| MAY Rose Services Ltd | Professional & scientific | 2023 |
| Maya Gardening & Constructions Ltd | Administrative & support | 2022 |
| Maya Medics Ltd | Real estate | 2013 |
| Mayah Consulting Ltd | Professional & scientific | 2022 |
| Mayakonda Medics Limited | Health & social care | 2020 |
| Mayakonda Properties Limited | Real estate | 2018 |
| Mayberry Court (Management) Limited | Households | 2016 |
| Maybs Student Recruitment Ltd | Education | 2026 |
| Mayes Holdings Limited | Financial services | 2009 |
| Mayes Property (UK) Limited | Real estate | 2022 |
| Mayfair & Stone Ltd | Manufacturing | 2026 |
| Mayfair Designs Nottingham Limited | Wholesale & retail | 2021 |
| Mayfair Estates Management Ltd | Real estate | 2023 |
| Mayfair Group (Holdings) Limited | Professional & scientific | 1992 |
| Mayfair Nails Ltd | Other services | 2022 |
| Mayfair Plastering Ltd | Construction | 2020 |
| Mayfair Polo Limited | Agriculture & fishing | 1996 |
| Mayfair Properties (London) Limited | Extraterritorial | 1996 |
| Mayfair Publications Ltd | Information & communication | 2015 |
| Mayfield Estates (Portugal) Limited | Administrative & support | 2015 |
| Mayfield Estates (UK) Limited | Real estate | 2003 |
| Mayfield House (Birmingham) Management Company Limited | Households | 2013 |
| Mayfield Metals Ltd | Wholesale & retail | 2019 |
| Mayflower North West (Holdings) Limited | Financial services | 2013 |
| Mayflower North West Limited | Construction | 2008 |
| Mayhap Films Ltd | Information & communication | 2021 |
| Mayhem Festivals Ltd | Information & communication | 2024 |
| Mayholme Property Management Company Limited | Extraterritorial | 2015 |
| Mayjahn Ltd | Real estate | 2025 |
| Maylock Insulations Ltd | Construction | 2025 |
| Maysus Labels Limited | | 1980 |
| Maytex Consultancy Ltd | Professional & scientific | 2015 |
| Maythorn 22 Limited | Professional & scientific | 2022 |
| Maythorne Developments Limited | Construction | 2022 |
| Maywiel Limited | Wholesale & retail | 2017 |
| Maze B Media Ltd | Financial services | 2025 |
| Maze Independent Care Limited | Other services | 2018 |
| Maze Property Group Ltd | Real estate | 2023 |
| Mazem Ltd | Health & social care | 2022 |
| Mazza Holdings Limited | Financial services | 2025 |
| Maîson Talent Management Ltd | Professional & scientific | 2023 |
| MB - East Midlands Limited | Wholesale & retail | 2003 |
| MB - Electric Centre Limited | Wholesale & retail | 2019 |
| MB - Green Centre Limited | Wholesale & retail | 2019 |
| MB - Hybrid Limited | Wholesale & retail | 2019 |
| MB Bookkeepers Limited | Professional & scientific | 2020 |
| MB Cable Jointing Services Ltd | Energy | 2015 |
| MB Carpentry Limited | Manufacturing | 2007 |
| MB Electrical (Hucknall) Limited | Construction | 2016 |
| MB Plumbing & Heating (Nottingham) Limited | Construction | 2007 |
| MB Pumps & Compressors Ltd | Manufacturing | 2000 |
| MB Recruitment & Consultancy Limited | Administrative & support | 2023 |
| MB Transport Solutions Ltd | Construction | 2016 |
| MB UK Trading Limited | Wholesale & retail | 2021 |
| Mb-Nottingham Ltd | Professional & scientific | 2006 |
| MBA Imports Limited | Wholesale & retail | 2022 |
| MBA Notts Ltd | Professional & scientific | 2016 |
| MBA Trading Ltd | Wholesale & retail | 2021 |
| Mbaria Enterprises Ltd | Health & social care | 2015 |
| Mbas Clothing Ltd | Wholesale & retail | 2021 |
| Mbas Hardware Ltd | Wholesale & retail | 2023 |
| MBD Car Parts Ltd | Wholesale & retail | 2020 |
| Mbdp Architecture Limited | Professional & scientific | 2015 |
| Mbex Ltd | Professional & scientific | 2014 |
| MBH Property Investments Limited | Real estate | 2024 |
| MBJ Building Services Limited | Construction | 2022 |
| MBK Residential Management Limited | Households | 2024 |
| Mbmiah Limited | Hospitality | 2022 |
| Mbskingsleyhealth Ltd | Health & social care | 2021 |
| Mburke Ltd | Administrative & support | 2018 |
| MBW Fashionaddict Limited | Wholesale & retail | 2025 |
| MC AAD Limited | Professional & scientific | 2026 |
| MC Carpets & Floorcoverings Ltd | Construction | 2026 |
| MC Liverpool Ltd | Hospitality | 2025 |