| MAJ Beauty Ltd | Wholesale & retail | 2025 |
| MAJ Medical Services Limited | Health & social care | 2022 |
| Maja Design House Limited | Professional & scientific | 2007 |
| Majbasil Ltd | Professional & scientific | 2022 |
| Majestic City Ltd | Wholesale & retail | 2026 |
| Majestic GB Ltd | Professional & scientific | 2009 |
| Majesty Life Care Limited | Health & social care | 2014 |
| Majid Pharmaplus Ltd | Other services | 2017 |
| Major & Sons Property Ltd | Real estate | 2025 |
| Major Brew Limited | Wholesale & retail | 2022 |
| Major Brothers Landscape & Design Limited | Administrative & support | 2026 |
| Major Brothers Limited | Construction | 2015 |
| Major Trauma Lawyers Limited | Administrative & support | 2025 |
| Majorca Consulting Ltd | Information & communication | 2016 |
| Majorfams Ltd | Hospitality | 2023 |
| Majors Trading Limited | Wholesale & retail | 2026 |
| MAK Halal Chef Ltd | Hospitality | 2026 |
| MAK Surveying Services Limited | Professional & scientific | 2006 |
| MAK TOK Limited | Wholesale & retail | 2018 |
| MAK1 Ltd | Health & social care | 2011 |
| Make Better Studio Limited | Professional & scientific | 2019 |
| Make Bookings Ltd | Education | 2023 |
| Make IT Digital Limited | Information & communication | 2023 |
| Make IT Disco Ltd | Manufacturing | 2024 |
| Make IT Work Global UK Ltd | Arts & recreation | 2019 |
| Make ME Films Limited | Arts & recreation | 2020 |
| Make ME Productions Limited | Information & communication | 2024 |
| Make Mouldings Ltd | Manufacturing | 2023 |
| Make My Day Entertainment Ltd | Wholesale & retail | 2019 |
| Make My Wall Ltd | Extraterritorial | 2023 |
| Make Sense Psychological Services Limited | Professional & scientific | 2014 |
| Make the CUT Limited | Information & communication | 2017 |
| Makers Store Limited | Wholesale & retail | 2021 |
| Makiko Design Studio Limited | Administrative & support | 2016 |
| Making a Difference for Everyone Limited | Other services | 2017 |
| Making Space Creative Ltd | Hospitality | 2026 |
| Makkah Fresh Foods Limited | Wholesale & retail | 2022 |
| Makkan Investments Ltd | Real estate | 2022 |
| Makkar Ltd | Health & social care | 2015 |
| Makoz Ltd | Health & social care | 2020 |
| Malaberg Ltd | Other services | 2020 |
| Malaika Zawadi Ltd | Professional & scientific | 2025 |
| Malava Cafe Ltd | Hospitality | 2024 |
| Malaysian Cafe Limited | Hospitality | 2022 |
| Malb Ltd | Hospitality | 2024 |
| Malden Holdings Limited | Financial services | 2020 |
| Malden Roofing Limited | Extraterritorial | 2003 |
| Maldertone Limited | Real estate | 1993 |
| Malema Capital Ltd | Professional & scientific | 2021 |
| Malevolated Limited | Wholesale & retail | 2019 |
| Malevolence Limited | Arts & recreation | 2016 |
| Malia Properties Ltd | Real estate | 2025 |
| Malik Corporation Limited | Wholesale & retail | 2011 |
| Malik Industries Limited | Financial services | 2025 |
| Malik Photography Ltd | Professional & scientific | 2023 |
| Malika Hamza Limited | Arts & recreation | 2018 |
| Malikmilk Limited | Construction | 2025 |
| Malin 11 Ltd | Other services | 2022 |
| Malin Bridge PUB Co Limited | Hospitality | 2023 |
| Malin Motor Bodies Limited | Wholesale & retail | 2017 |
| Maline Property Solutions Ltd | Real estate | 2019 |
| Mali’S Kitchen Ltd | Hospitality | 2026 |
| Mali’S Kitchen Ltd Ltd | Hospitality | 2026 |
| Malleon Media Ltd | Information & communication | 2005 |
| Mallorn Roofing Contractors Ltd | Construction | 2014 |
| Mallory Motor Company Limited | | 1983 |
| Maloku Property Holdings Ltd | Real estate | 2025 |
| Maloney Estates Limited | Real estate | 2022 |
| Malory Galory Ltd | Wholesale & retail | 2026 |
| Malt Create Limited | Information & communication | 2021 |
| Malt Films Limited | Information & communication | 2009 |
| Maltby Design Co Ltd | Professional & scientific | 2018 |
| Maltby Developments Limited | Real estate | 2017 |
| Maltby Logistics and Planning Ltd | Transport & logistics | 2022 |
| Maltby Main Football Club Ltd | Arts & recreation | 2025 |
| Maltby Management Limited | Real estate | 2017 |
| Maltby Restoration Limited | Water & waste | 2017 |
| Maltek UK Ltd | Professional & scientific | 2021 |
| Maltgate Pubs Ltd | Hospitality | 2024 |
| Malting Garage Ltd | Wholesale & retail | 2008 |
| MAM Care Services Ltd | Health & social care | 2023 |
| MAM Investment Holdings Limited | Financial services | 2026 |
| Mama Bears Pantry Limited | Manufacturing | 2023 |
| Mama Becoming CIC | Health & social care | 2026 |
| Mama MIA Pepe Ltd | Administrative & support | 2016 |
| Mama Shop Ltd | Wholesale & retail | 2023 |
| Mama WEI Ltd | Hospitality | 2025 |
| Mamamaru Ltd | Real estate | 2024 |
| Mambo Bar Limited | Hospitality | 2025 |
| Mammas Homegoods Ltd | Hospitality | 2025 |
| Mamrs Maintenance Services Ltd | Construction | 2026 |
| Mamurra Limited | Real estate | 2022 |
| MAN Alive Entertainment Limited | Administrative & support | 2015 |
| MAN Cave Retros Limited | Extraterritorial | 2018 |
| MAN CUB Productions Limited | Information & communication | 2018 |
| MAN Estates Ltd | Real estate | 2026 |
| MAN Management & Consultancy Limited | Professional & scientific | 2025 |
| MAN Motoring Service Limited | Wholesale & retail | 2019 |
| MAN the Phones Ltd | Administrative & support | 2016 |
| Manage and Cope Ltd | Transport & logistics | 2019 |