| Musculoskeletal Investigations Limited | Health & social care | 2022 |
| Muse Coffee Hub Limited | Hospitality | 2020 |
| Museum Data Service | Information & communication | 2024 |
| Musgrave Generators Limited | Manufacturing | 1971 |
| Musgrave Generators Services Ltd | Extraterritorial | 2018 |
| Mushtaqs Travel Ltd | Administrative & support | 2022 |
| Music Arts Ltd | Arts & recreation | 2012 |
| Music Education Learning Limited | Other services | 2022 |
| Music Steps Limited | Education | 2013 |
| Music Trail Limited | Arts & recreation | 2017 |
| Music:Defined Hub CIC | Education | 2026 |
| Music:Defined Limited | Administrative & support | 2020 |
| Musicgangsters Limited | Manufacturing | 2025 |
| Musick,Al Limited | Information & communication | 2025 |
| Musion China Limited | Information & communication | 2016 |
| Musion Events Limited | Wholesale & retail | 2008 |
| Musion IP Limited | Professional & scientific | 2008 |
| MUSION3D Limited | Arts & recreation | 2014 |
| Muskaan Beauty Advance Treatments Limited | Other services | 2025 |
| Muskaan Hair, Nails & Beauty Ltd | Other services | 2005 |
| Muskan Lalani Limited | Wholesale & retail | 2024 |
| Musleemat Ltd | Wholesale & retail | 2021 |
| Muslim Community College (Intl) | Education | 2014 |
| Musoft Limited | Information & communication | 1985 |
| Mussa Construction Ltd | Construction | 2017 |
| Mussa Holdings Limited | Financial services | 2020 |
| Mussa IT Service Ltd | Information & communication | 2016 |
| Mussa Piranie Garments Limited | Wholesale & retail | 2020 |
| Mussah Healthcare Limited | Public administration | 2025 |
| Musse Ltd | Transport & logistics | 2023 |
| Mussett 2020 Limited | Professional & scientific | 2020 |
| Mussett Aerospace Ltd | Manufacturing | 2006 |
| Mustafa Halal Butcher Limited | Wholesale & retail | 2019 |
| Mustang Mobil Limited | Professional & scientific | 2012 |
| Musthave Solutions Limited | Manufacturing | 2008 |
| Mutarazi Resource Company Limited | Mining & quarrying | 2024 |
| Mute Media Limited | Professional & scientific | 2026 |
| Muthuswamy Medical Ltd | Health & social care | 2023 |
| Mutt and Mischief Ltd | Manufacturing | 2024 |
| MUU LA Ltd | Wholesale & retail | 2021 |
| Muxloe Consulting Ltd | Professional & scientific | 2024 |
| Muye Ltd | Administrative & support | 2025 |
| MV Installations Electrical Limited | Construction | 2008 |
| MV Optics Ltd | Health & social care | 2024 |
| MV Retail Leicester Ltd | Wholesale & retail | 2023 |
| MVA Investments Limited | Wholesale & retail | 2008 |
| Mvgt Ltd | Transport & logistics | 2018 |
| Mvip Bros Ltd | Hospitality | 2020 |
| Mvip Enterprise Limited | Hospitality | 2017 |
| Mvish Ltd | Wholesale & retail | 2023 |
| Mvkq Leicester Ltd | Hospitality | 2026 |
| MVM Cleaning Services Ltd | Administrative & support | 2026 |
| MVR Power Ltd | Transport & logistics | 2023 |
| MW Acoustic Solutions Limited | Professional & scientific | 2007 |
| MW Bar Enterprises Limited | Hospitality | 2021 |
| MW Fabs Ltd | Manufacturing | 2020 |
| MW Momentum Ltd | Real estate | 2020 |
| MW Motor Group Ltd | Wholesale & retail | 2024 |
| MW New Walk (101) Limited Partnership | | 2015 |
| MW Personal Equity (Harbinger Self Storage) Limited | Professional & scientific | 2018 |
| MW Private Equity (Harbinger Self Storage Developments) General Partner Limited | Professional & scientific | 2022 |
| MW Private Equity (Harbinger Self Storage Developments) Limited Partnership | | 2022 |
| MW Private Equity (Harbinger Self Storage) General Partner Limited | Professional & scientific | 2017 |
| MW Private Equity (Harbinger Self Storage) Limited Partnership | | 2018 |
| MW Private Investors (101) Limited Partnership | | 2014 |
| MW Private Investors (102) Limited Partnership | | 2015 |
| MW Private Investors (103) Limited Partnership | | 2015 |
| MW Private Investors (105) General Partner Limited | Professional & scientific | 2015 |
| MW Private Investors (105) Limited Partnership | | 2015 |
| MW Private Investors (106) General Partner Limited | Professional & scientific | 2018 |
| MW Private Investors (106) Limited Partnership | | 2018 |
| MW Private Investors (Agripartners) Limited Partnership | | 2020 |
| MW Private Investors (Barwood Capital) Limited Partnership | | 2019 |
| MW Private Investors (Beech Properties) Limited Partnership | | 2016 |
| MW Private Investors (Citu) Limited Partnership | | 2017 |
| MW Private Investors (Dundalk) Limited Partnership | | 2020 |
| MW Private Investors (Earthworm) Limited Partnership | | 2019 |
| MW Private Investors (Expedia Dental) General Partner Limited | Professional & scientific | 2019 |
| MW Private Investors (Expedia Dental) Limited Partnership | | 2019 |
| MW Private Investors (Gage Taplow) Limited Partnership | | 2019 |
| MW Private Investors (Heaton Group) General Partner Limited | Professional & scientific | 2018 |
| MW Private Investors (Heaton Group) Limited Partnership | | 2018 |
| MW Private Investors (Highcross BTR) Limited Partnership | | 2022 |
| MW Private Investors (Newstead Relf) General Partner Limited | Professional & scientific | 2021 |
| MW Private Investors (Newstead Relf) Limited Partnership | | 2021 |
| MW Private Investors (Peak Resort) Limited Partnership | | 2016 |
| MW Private Investors (Piper Homes) Limited Partnership | | 2018 |
| MW Private Investors (Proseed) General Partner Limited | Extraterritorial | 2017 |
| MW Private Investors (Proseed) Limited Partnership | | 2017 |
| MW Private Investors (Prosperity Liverpool) Limited Partnership | | 2019 |
| MW Private Investors (Residential Property Portfolio) Limited Partnership | | 2017 |
| MW Private Investors (Swift Point) Limited Partnership | | 2020 |
| MW Private Investors (Tungsten Frimley) Limited Partnership | | 2021 |
| MW Private Investors (Tungsten Witney) Limited Partnership | | 2019 |
| MW Private Investors (Versant) General Partner Limited | Professional & scientific | 2018 |
| MW Private Investors (Versant) Limited Partnership | | 2018 |
| MW Private Investors (Welbeck Land) General Partner Limited | Extraterritorial | 2016 |
| MW Private Investors (Welbeck Land) Limited Partnership | | 2016 |
| MW Properties (NO 46) Limited | Professional & scientific | 2006 |
| MW Properties NO 20 Limited | Professional & scientific | 2005 |