| Mshah Ltd | Health & social care | 2016 |
| MSI Technologies Limited | Manufacturing | 1995 |
| MSK Professional Services Limited | Professional & scientific | 2023 |
| MSM Dental Limited | Health & social care | 2025 |
| MSM Marketing Ltd | Professional & scientific | 2023 |
| Msmile Properties Ltd | Real estate | 2024 |
| Msmw Enterprises Limited | Wholesale & retail | 2020 |
| MSP Wolves Ltd | Hospitality | 2019 |
| Mspb Ltd | Real estate | 2015 |
| Mspp Ltd | Hospitality | 2026 |
| MSR Investment Group Limited | Hospitality | 2019 |
| MSR Ventures Limited | Wholesale & retail | 2018 |
| MSS Property Management Limited | Households | 2023 |
| MSS Trade Limited | Wholesale & retail | 2025 |
| MST & James Ltd | Professional & scientific | 2018 |
| MST Automotive Ltd | Wholesale & retail | 2025 |
| Msuk Transport Ltd | Transport & logistics | 2017 |
| Msv.J Ltd | Wholesale & retail | 2025 |
| MSZ Brands Limited | Financial services | 2020 |
| MT Counselling Limited | Health & social care | 2023 |
| MT Foster Holdings Limited | Financial services | 2013 |
| MTD Flipmode Ltd | Wholesale & retail | 2022 |
| Mtech Property Services Limited | Education | 2014 |
| MTG Entertainment & Sports Ltd | Information & communication | 2025 |
| Mthch Ltd | Wholesale & retail | 2026 |
| MTL Jacks Heating & Plumbing Ltd | Construction | 2019 |
| MTR Property Ltd | Real estate | 2021 |
| MTS Accountancy Services Limited | Professional & scientific | 2016 |
| Mtsm Consulting Ltd | Real estate | 2025 |
| Mtth Holdings Limited | Financial services | 2022 |
| MTU Wergs Limited | Financial services | 2015 |
| MU Deal Ltd | Information & communication | 2023 |
| Mucis Limited | Transport & logistics | 2025 |
| Mudziyashe Private Limited | Professional & scientific | 2017 |
| Mufasa Ventures Ltd | Wholesale & retail | 2025 |
| MUG Monster Limited | Wholesale & retail | 2020 |
| Muhammad Awais Baig Group Limited | Wholesale & retail | 2026 |
| Muhammad Umer Javed Ltd | Wholesale & retail | 2025 |
| Muhammad Waqas World Ltd | Information & communication | 2025 |
| Muirsidhex Ltd | Transport & logistics | 2021 |
| MUK & Sons Limited | Administrative & support | 2011 |
| Muka Electrical Ltd | Construction | 2021 |
| Mukkar Transport Limited | Transport & logistics | 2025 |
| Mulberry Phoenix Limited | Real estate | 2024 |
| Mullings Accountancy & Professional Services Ltd | Professional & scientific | 2019 |
| Mullings Real Estates Ltd | Real estate | 2020 |
| Multani Freight Ltd | Transport & logistics | 2024 |
| Multani Group Ltd | Information & communication | 2005 |
| Multani Properties Midlands Ltd | Real estate | 2024 |
| Multani Transport Ltd | Transport & logistics | 2018 |
| Multanis Properties Group Ltd | Real estate | 2024 |
| Multea Choice Wolverhampton Ltd | Wholesale & retail | 2023 |
| Multi Brand Services Limited | Other services | 1998 |
| Multi Development 1 UK Partnership | | 2005 |
| Multi Development 2 UK Partnership | | 2006 |
| Multi Utility Design & Management Ltd | Construction | 2025 |
| Multichannel Solutions Ltd | Wholesale & retail | 2026 |
| Multidmedia Limited | Information & communication | 2003 |
| Multipicz Ltd | Wholesale & retail | 2022 |
| Multiplayer Ltd | Hospitality | 2017 |
| Multiple Quantum Assets Investment Limited | Real estate | 2024 |
| Multiple Quantum Digital Services Limited | Wholesale & retail | 2024 |
| Multipro Insulation Ltd | Construction | 2025 |
| Multistream Line Limited | Real estate | 2003 |
| Munapri Ltd | Information & communication | 2025 |
| Mundh Logistics Ltd | Transport & logistics | 2024 |
| Muneeb Sarfraz Ltd | Wholesale & retail | 2026 |
| Municipal Vehicle Auctions.Com Limited | Information & communication | 2006 |
| Muntean Transport Limited | Transport & logistics | 2020 |
| Munyarc Ltd | Health & social care | 2024 |
| Muqaddas Travels Ltd | Wholesale & retail | 2025 |
| Muras Baker Jones Group Limited | Professional & scientific | 2024 |
| Muras Baker Jones Holdings Limited | Financial services | 2022 |
| Muras Baker Jones Limited | Professional & scientific | 2014 |
| Murdale Limited | Extraterritorial | 2011 |
| Muriel Properties Ltd | Real estate | 2021 |
| Murlaz Ltd | Health & social care | 2012 |
| Murphy Busy TEE Limited | Wholesale & retail | 2017 |
| Muscle Bubble Ltd | Wholesale & retail | 2023 |
| Muscle&Jointcare Ltd | Health & social care | 2025 |
| Museboard Limited | Wholesale & retail | 2025 |
| Mushambahuro Advertising Private Limited | Administrative & support | 2018 |
| Music 2000 Ltd | Wholesale & retail | 2019 |
| Musiol Limited | Transport & logistics | 2025 |
| Muskam International Limited | Wholesale & retail | 2025 |
| Muslee Ltd | Wholesale & retail | 2026 |
| Must BE LET Ltd | Real estate | 2009 |
| Must Cleaning Services Limited | Administrative & support | 2025 |
| Mustb Ltd | Professional & scientific | 2023 |
| Mustyojay BIZ Ltd | Administrative & support | 2024 |
| Mutarakilo Limited | Health & social care | 2022 |
| Mutees Solutions Ltd | Wholesale & retail | 2022 |
| Muzaffar Ltd | Wholesale & retail | 2026 |
| Muzna Ltd | Professional & scientific | 2019 |
| Muzy Local Stores Ltd | Wholesale & retail | 2025 |
| Muzy Mart Store Ltd | Wholesale & retail | 2026 |
| MVR Constructions Ltd | Construction | 2026 |
| MW Products Ltd | Wholesale & retail | 2020 |
| MW Security Ltd | Administrative & support | 2024 |
| MW82 Ltd | Construction | 2021 |