| Matharley Property Limited | Real estate | 2020 |
| Matharoo & Singh Limited | Professional & scientific | 2015 |
| Mathcore Tuition Ltd | Education | 2026 |
| Maths Confidence London Ltd | Education | 2025 |
| Mathsuplevel Ltd | Education | 2016 |
| Mathury Ltd | Health & social care | 2025 |
| Matli Motor Limited | Wholesale & retail | 2025 |
| Matrix Compliance Limited | Extraterritorial | 2016 |
| Matrix DOT UK Ltd | Information & communication | 2017 |
| Matrix Heating Limited | Construction | 2019 |
| Matrix Home Supplies Ltd | Construction | 2019 |
| Matrixxx Ltd | Transport & logistics | 2025 |
| Matrock Limited | Administrative & support | 2009 |
| Matryxsoft UK Limited | Information & communication | 2023 |
| Matsurika Flowers Limited | Wholesale & retail | 2023 |
| Matt Little Strength & Conditioning Ltd. | Education | 2014 |
| Matt Manwaring Construction Limited | Construction | 2016 |
| Matteo Professional Cleaning Ltd | Administrative & support | 2026 |
| Matts Convenience Ltd | Wholesale & retail | 2024 |
| Matty.Locum Ltd | Health & social care | 2024 |
| Matwala Vyas Legal Ltd | Professional & scientific | 2017 |
| Matwala Vyas LLP | | 2003 |
| Maucare Limited | Health & social care | 2025 |
| Maughan Motors Limited | Wholesale & retail | 2020 |
| Maurion Elite Security Ltd | Construction | 2025 |
| Mauritius Paradise Catering Limited | Wholesale & retail | 2015 |
| Maven Management Services Limited | Construction | 2013 |
| Maven Services Ltd | Extraterritorial | 2016 |
| Maverick Technologies Ltd | Information & communication | 2023 |
| Maverock Construction Ltd | Construction | 2025 |
| Mawais Limited | Wholesale & retail | 2022 |
| Mawce Recruit Ltd | Administrative & support | 2024 |
| Mawwa Ltd | Transport & logistics | 2020 |
| MAX & MAX Limited | Hospitality | 2004 |
| MAX and Alex Ltd | Wholesale & retail | 2023 |
| MAX Baba Limited | Transport & logistics | 2017 |
| MAX Fashions Ltd | Wholesale & retail | 2024 |
| MAX FLY Ltd | Wholesale & retail | 2024 |
| MAX Holdings Hsqe Compliance Ltd | Construction | 2025 |
| MAX LEE Limited | Professional & scientific | 2019 |
| MAX Private Limited | Real estate | 2024 |
| MAX Properties Group Limited | Real estate | 2025 |
| MAX Residentials Ltd | Real estate | 2020 |
| MAX Shine Mobile Cleaner Ltd | Administrative & support | 2021 |
| MAX Traders (UK) Limited | Manufacturing | 2005 |
| Max's Properties Ltd | Real estate | 2020 |
| Maxbets Limited | Other services | 2015 |
| Maxcore Ltd | Construction | 2025 |
| Maxcourt Limited | Health & social care | 2011 |
| Maxen Power Supply Limited | Energy | 2016 |
| Maxi Global Ltd | Wholesale & retail | 2015 |
| Maxify Holdings Ltd | Mining & quarrying | 2025 |
| Maxim One Limited | Financial services | 2001 |
| Maximum Risk Security Ltd | Administrative & support | 2009 |
| Maxipowercleaning Ltd | Administrative & support | 2013 |
| Maxis PVT Ltd | Wholesale & retail | 2024 |
| Maxlaw Professional Services Ltd | Professional & scientific | 2023 |
| Maxlaw Solicitors Ltd | Professional & scientific | 2019 |
| Maxlem Limited | Construction | 2020 |
| Maxpro Constructions Ltd | Construction | 2023 |
| Maxprogear Ltd | Wholesale & retail | 2025 |
| Maxsa Limited | Hospitality | 2024 |
| Maxsaver Energy Limited | Energy | 2024 |
| Maxssype Limited | Wholesale & retail | 2026 |
| Maxtraderswaste Ltd | Water & waste | 2020 |
| Maxusbuy Ltd | Wholesale & retail | 2023 |
| Maxvik Limited | Real estate | 2016 |
| Maxwell Hart Ltd | Administrative & support | 2025 |
| Maxwell House Limited | Real estate | 2016 |
| Maxwell Prop Ltd | Real estate | 2025 |
| Maxwell Properties Investment Ltd | Real estate | 2025 |
| Maxwell Solicitors Ltd | Professional & scientific | 2015 |
| Maxx Health Limited | Wholesale & retail | 2013 |
| Maxx Health Meals Ltd | Manufacturing | 2019 |
| MAY Security Ltd | Administrative & support | 2026 |
| Maya & Celia Vogue Ltd | Wholesale & retail | 2023 |
| Maya Children's Therapy Ltd | Wholesale & retail | 2019 |
| Maya Properties London Ltd | Real estate | 2024 |
| Maya Residential London Limited | Real estate | 2013 |
| Maya SAI Properties Ltd | Real estate | 2022 |
| Mayacata Construct Ltd | Construction | 2020 |
| Mayah Beauty Ltd | Wholesale & retail | 2021 |
| Mayamaid Ltd | Administrative & support | 2025 |
| Mayan Investments Ltd | Real estate | 2020 |
| Maybeess Limited | Wholesale & retail | 2021 |
| Maybeinaline Ltd | Wholesale & retail | 2023 |
| Maybloom IT Ltd | Information & communication | 2012 |
| Maydo Limited | Information & communication | 2024 |
| Mayes & Co Limited | Information & communication | 2014 |
| Mayesbrook Food Ltd | Hospitality | 2023 |
| Mayfair Beauty Ltd | Wholesale & retail | 2022 |
| Mayfair Car and Hire Ltd | Wholesale & retail | 2021 |
| Mayfair Carriages (London) Limited | Transport & logistics | 2018 |
| Mayfair Consulting Services Ltd | Construction | 2024 |
| Mayfair Corporate Holdings Ltd | Financial services | 2026 |
| Mayfair Group Ltd | Administrative & support | 2019 |
| Mayfair London Limited | Real estate | 2018 |
| Mayfair Management Solutions Ltd | Construction | 2026 |
| Mayfair Transport Services Limited | Transport & logistics | 2017 |
| Mayfairs Law Limited | Professional & scientific | 2019 |