| Maisie Properties Ltd | Real estate | 2025 |
| Maison Brume Limited | Wholesale & retail | 2026 |
| Maison Rustique Limited | Wholesale & retail | 2012 |
| Maison V&B Limited | Wholesale & retail | 2025 |
| Maito Trans Ltd | Transport & logistics | 2026 |
| MAJ and Sons Ltd | Construction | 2024 |
| Majestic Bingo Online Ltd | Arts & recreation | 2014 |
| Majestic Motor Spares International Limited | Wholesale & retail | 2016 |
| Majestic Motors Stoke Ltd | Wholesale & retail | 2025 |
| Majoka Ltd | Wholesale & retail | 2024 |
| Major Minor Transport Ltd | Transport & logistics | 2012 |
| Major PJM Ltd | Wholesale & retail | 2024 |
| Maju Properties Ltd | Real estate | 2021 |
| MAK Blades Ltd | Wholesale & retail | 2025 |
| MAK Power OMS JV Ltd | Professional & scientific | 2025 |
| MAK Property Group Limited | Real estate | 2020 |
| MAK Property Services Limited | Real estate | 2025 |
| Maka Transport Limited | Transport & logistics | 2017 |
| Make UP by Anza Ltd | Other services | 2019 |
| Make-Up by Louise Ltd | Other services | 2019 |
| Making Your Home Ltd | Real estate | 2019 |
| Makis Limited | Hospitality | 2026 |
| Makmount Limited | Wholesale & retail | 2025 |
| Makola Market Afro Caribbean Shop Ltd | Wholesale & retail | 2020 |
| Makslam Stoke Ltd | Hospitality | 2025 |
| MAL Medicare Limited | Health & social care | 2023 |
| Malabar Majlis Catering & Events Ltd | Hospitality | 2025 |
| Malco Holdings Limited | Real estate | 2006 |
| Malibu Marquees Limited | Arts & recreation | 2009 |
| Malik Awan Transport Limited | Transport & logistics | 2025 |
| Malik Group Limited | Real estate | 2019 |
| Malldova Limited | Wholesale & retail | 2020 |
| Mallick Global Ltd | Professional & scientific | 2026 |
| Malthouse Medical Limited | Health & social care | 2019 |
| Maltnhops Fenton Ltd | Hospitality | 2019 |
| Malvern House Properties Ltd | Real estate | 2016 |
| Mama's Sweet Treats Limited | Manufacturing | 2020 |
| Mamaz World Ltd | Wholesale & retail | 2023 |
| Mamlakh Ltd | Construction | 2018 |
| MAN Jones Limited | Real estate | 2019 |
| Manafates Limited | Hospitality | 2024 |
| Managed Finance Solutions Ltd | Professional & scientific | 2024 |
| Mandervale Properties Limited | Construction | 2004 |
| Mandykay Limited | Hospitality | 2025 |
| Mangrove Care Ltd | Health & social care | 2005 |
| Manhattan Pizza (Stoke) Limited | Hospitality | 2019 |
| Manifold Station Ltd | Hospitality | 2022 |
| Mann K9 Protection Services Ltd | Extraterritorial | 2022 |
| Mann Neurolegal Ltd | Health & social care | 2010 |
| Manna Healthy Foods Ltd | Manufacturing | 2015 |
| Manna House (Hanley) | Extraterritorial | 2011 |
| Manning and Bourne Holdings Limited | Financial services | 2025 |
| Mannock Property Developments Ltd | Construction | 2021 |
| Manor Domestic Services Limited | Professional & scientific | 2016 |
| Manor Hall Academy Trust | Education | 2015 |
| Manrz Ltd | Financial services | 2023 |
| Mansf Ltd | Education | 2024 |
| Mantra Aerial Lift Parts Ltd | Wholesale & retail | 2025 |
| Manuka 6 Ltd | Information & communication | 2015 |
| Manzil LLC Ltd | Professional & scientific | 2025 |
| Maple Avenue Events Limited | Information & communication | 2024 |
| Maple Construction Services Ltd | Construction | 2026 |
| Maple House Design Consultants Limited | Professional & scientific | 2016 |
| Maple Landscape Design Ltd | Administrative & support | 2022 |
| Maplewood Management Consulting Limited | Extraterritorial | 2003 |
| Maprop Limited | Financial services | 2003 |
| Maqsood Five Ltd | Real estate | 2026 |
| Maqtech Ltd | Information & communication | 2024 |
| Mar&Sam Ltd | Hospitality | 2026 |
| Mara Plumbing Limited | Construction | 2025 |
| Marathes Ltd | Real estate | 2019 |
| Marcel's Gardening Ltd | Agriculture & fishing | 2022 |
| March Rail Services Ltd | Construction | 2019 |
| Marcin Zganiacz Limited | Transport & logistics | 2017 |
| Marco's Builders Ltd | Construction | 2023 |
| Marcom Nexus Limited | Professional & scientific | 2026 |
| Marcus Estates Limited | Financial services | 2012 |
| Marcus Machine and Tools Limited | Construction | 1977 |
| Margaret Print Ltd | Manufacturing | 2022 |
| Mariam Kitchen Ltd | Hospitality | 2024 |
| Mariam Supermarket Ltd | Wholesale & retail | 2024 |
| Marija Bubnaityte Limited | Extraterritorial | 2025 |
| Marija Kisieliene Limited | Extraterritorial | 2025 |
| Marin & Dana Ltd | Transport & logistics | 2019 |
| Marin Graphics Ltd | Professional & scientific | 2022 |
| Marinelle Capatar Limited | Administrative & support | 2023 |
| Marinoon Property Holdings Limited | Real estate | 2017 |
| Mario CMA Limited | Construction | 2025 |
| Mario Silva Ltd | Construction | 2022 |
| Mario-Sorin Transport Ltd | Transport & logistics | 2015 |
| Marius Driving Services Ltd | Transport & logistics | 2023 |
| Marius Vlaicu Ltd | Transport & logistics | 2018 |
| Mariusz Skorka Transport Ltd | Transport & logistics | 2014 |
| Mariyan Properties 2020 Ltd | Real estate | 2020 |
| Marj Services Ltd | Construction | 2025 |
| Mark & Paul's Butchers Ltd | Wholesale & retail | 2024 |
| Mark Alexander Products Ltd | Wholesale & retail | 2025 |
| Mark Elliott Photography Ltd | Professional & scientific | 2012 |
| Mark Elwell Services Limited | Construction | 2007 |
| Mark Emery (Coachbuilding) Limited | Manufacturing | 2010 |