| MUA Logistics Limited | Transport & logistics | 2016 |
| Muaaz Rashid Ltd | Professional & scientific | 2023 |
| Muash Sage Ltd | Wholesale & retail | 2021 |
| Muaz Services Ltd | Other services | 2023 |
| MUB3 UK Ltd | Wholesale & retail | 2019 |
| MUD Equestrian Ltd | Wholesale & retail | 2026 |
| Mudassar M Company Ltd | Education | 2026 |
| Mudhar Properties Ltd | Real estate | 2020 |
| Muftico Limited | Professional & scientific | 2025 |
| Mufty's Entertainment Limited | Hospitality | 2020 |
| Mugged Ltd | Wholesale & retail | 2025 |
| Mughal Invest Limited | Real estate | 2025 |
| Mughal Trade Limited | Wholesale & retail | 2025 |
| Muhammad Akash Ltd | Wholesale & retail | 2025 |
| Muhammad FAI Ltd | Wholesale & retail | 2025 |
| Muhammad Ibrahim Ltd | Wholesale & retail | 2024 |
| Muhammad Javed Ltd | Administrative & support | 2022 |
| Muhammed Rashid Limited | Administrative & support | 2016 |
| Muhammed Transport Ltd | Transport & logistics | 2023 |
| Muja Homes Limited | Real estate | 2022 |
| Mujtaba Syed Consulting Ltd | Information & communication | 2025 |
| Mukhtar & Sons Limited | Wholesale & retail | 2026 |
| Mulberry Design Partnership Ltd | Professional & scientific | 2018 |
| Mulberry Property Advisory Ltd | Professional & scientific | 2025 |
| Mulcahy Properties & Development Ltd | Real estate | 2023 |
| Mulla Brothers Limited | Construction | 2019 |
| Mulla Cakes Ltd | Manufacturing | 2019 |
| Multani Kitchen & Bedrooms Ltd | Construction | 2025 |
| Multi Mobile Ltd | Wholesale & retail | 2024 |
| Multi Services Limited | Administrative & support | 2003 |
| Multi Services PVT Ltd | Transport & logistics | 2011 |
| Multi Speciality Physiotherapy and Rehab Centre Ltd | Health & social care | 2026 |
| Multi Tasking Ltd | Information & communication | 2023 |
| Multi-Prospects Limited | Professional & scientific | 2008 |
| Multicare International Ltd | Professional & scientific | 2025 |
| Multicert Services Ltd | Construction | 2025 |
| Multiclima Ltd | Construction | 2018 |
| Multiflora Ltd | Real estate | 2018 |
| Multilevel Ltd | Professional & scientific | 2024 |
| Multilingual Child Care Ltd | Health & social care | 2018 |
| Multiskilled Drylining Ltd | Construction | 2019 |
| Multispace Construction Ltd | Construction | 2020 |
| Multispray London Limited | Construction | 2019 |
| Multitown Construction Limited | Construction | 2017 |
| Multivision Technologies Limited | Construction | 2016 |
| Multivisiondigital Ltd | Information & communication | 2021 |
| Mumbai Dera Limited | Hospitality | 2018 |
| Mumbere Ltd | Health & social care | 2021 |
| Mums and Little Explorers Ltd | Education | 2024 |
| Mums and Moore Ltd | Wholesale & retail | 2022 |
| Mumu's Tiney Home Nursery Limited | Health & social care | 2025 |
| Mumufarm Ltd | Information & communication | 2012 |
| Mumzies Munchies Ltd | Hospitality | 2022 |
| Munch Distributes Limited | Wholesale & retail | 2023 |
| Munchkinz Ltd | Education | 2018 |
| Mundania Court Freehold Limited | Households | 2009 |
| Mundial Services Ltd | Construction | 2016 |
| Munoverse Ltd | Wholesale & retail | 2024 |
| Munshi Enterprises Limited | Wholesale & retail | 2025 |
| Munshi Healthcare Imaging Limited | Health & social care | 2022 |
| Munshiganj Jela Jatiyotabadi Forum UK | Health & social care | 2025 |
| Muntaha Services Limited | Administrative & support | 2026 |
| Munzil Halal Finance Ltd | Financial services | 2025 |
| Muratez. Limited | Health & social care | 2021 |
| Murkary Solutions Limited | Other services | 2019 |
| Murkveil Ltd | Wholesale & retail | 2025 |
| Murray Interiors (UK) Limited | Construction | 2018 |
| Murray Refurbishment (UK) Ltd | Construction | 2021 |
| Murthaza's Football Club CIC | Arts & recreation | 2023 |
| Murukan Holding Ltd | Real estate | 2025 |
| Murusys Limited | Information & communication | 2016 |
| Murysec Ltd | Administrative & support | 2014 |
| MUS Civil UK Limited | Construction | 2024 |
| Musa Auto Garage Ltd | Wholesale & retail | 2025 |
| Musamart Ltd | Wholesale & retail | 2025 |
| Musclefox Ltd | Professional & scientific | 2016 |
| Musculoskeletal Intelligence Limited | Health & social care | 2017 |
| Musfi Ltd | Wholesale & retail | 2022 |
| Mush&Goraya Ltd | Wholesale & retail | 2025 |
| Musheraf Ltd | Real estate | 2025 |
| Mushtaq Properties Limited | Real estate | 2017 |
| Music PUB Co Ltd | Hospitality | 2018 |
| Musiccaliber Ltd | Wholesale & retail | 2025 |
| Musk Amber Limited | Wholesale & retail | 2025 |
| Muslim Community of Essex | Education | 2011 |
| Muslim Family Initiative Limited | Education | 2019 |
| Muslim Global Events Ltd | Professional & scientific | 2025 |
| Muslim Hypnobirthing Ltd | Education | 2026 |
| Muslim Mamas Ltd | Professional & scientific | 2018 |
| Muslim Spouse Limited | Information & communication | 2025 |
| Muslim Women's Welfare Association (Waltham Forest) | Health & social care | 2013 |
| Muslimgiving Limited | Other services | 2015 |
| Musta Contractors Limited | Construction | 2017 |
| Mustang Chauffeurs Ltd | Transport & logistics | 2024 |
| Mustard Music Group Ltd | Information & communication | 2024 |
| Musu Services Ltd | Transport & logistics | 2024 |
| Mutti Building Group Ltd | Construction | 2025 |
| Mutti Contractors Ltd | Construction | 2015 |
| Muubaa Trading Ltd | Administrative & support | 2016 |
| Muva Ltd | Wholesale & retail | 2026 |