| Muckraker Ltd | Information & communication | 2025 |
| Mucky Munchkins Childcare Limited | Health & social care | 2016 |
| MUE Investments Ltd | Real estate | 2025 |
| Muez Ltd | Wholesale & retail | 2025 |
| Mufa Projects Ltd | Real estate | 2019 |
| Mufaza Ltd | Hospitality | 2023 |
| Muffin Ventures Ltd | Hospitality | 2024 |
| Mughal Shopfitting Ltd | Construction | 2022 |
| MUH Services Ltd | Professional & scientific | 2018 |
| Muhamad Zeeshan Ltd | Wholesale & retail | 2025 |
| Muhammad Imran Ltd | Wholesale & retail | 2025 |
| Muhammad Karim Ltd | Health & social care | 2025 |
| Muhammad M Patel Limited | Health & social care | 2016 |
| Muizz Patel Limited | Health & social care | 2013 |
| Mujo Panacea Limited | Manufacturing | 2026 |
| Mukan Limited | Administrative & support | 2026 |
| Mukarram Zaheer Ltd | Wholesale & retail | 2023 |
| Mukesh Hemmady Limited | Health & social care | 2011 |
| Mukhtar Building Services Ltd | Construction | 2025 |
| Muki Craft Ltd | Wholesale & retail | 2025 |
| Mulaah Limited | Extraterritorial | 2024 |
| Mulla Pharm Limited | Wholesale & retail | 2011 |
| Mullascript Solutions Ltd | Information & communication | 2023 |
| Multi Bikes Limited | Wholesale & retail | 2017 |
| Multi Trade Holding Ltd | Financial services | 2021 |
| Multi Trades Recruitment Ltd | Administrative & support | 2012 |
| Multi-Portal Properties Ltd | Real estate | 2024 |
| Multicon Ltd | Wholesale & retail | 2025 |
| Multineedz Ltd | Wholesale & retail | 2021 |
| Multiordinal Limited | Information & communication | 2013 |
| Mum's Mate Ltd | Wholesale & retail | 2016 |
| Mumachi Holding Ltd | Real estate | 2024 |
| Munch Box Bolton Ltd | Hospitality | 2025 |
| Mundus Corporation Limited | Information & communication | 2022 |
| Municipal Vehicle Inspection Services Limited | Wholesale & retail | 2000 |
| Munir Mitha BDS Limited | Health & social care | 2007 |
| Munrah Ltd | Wholesale & retail | 2025 |
| Munro Therapy Services Limited | Health & social care | 2007 |
| Munshi Dentacare Limited | Health & social care | 2018 |
| Muntaha Tech Ltd | Wholesale & retail | 2023 |
| Murhey Group Ltd | Administrative & support | 2023 |
| Murmuration Consulting Limited | Professional & scientific | 2025 |
| Murphy Healthcare Ltd | Health & social care | 2024 |
| Murphy Motor Group Ltd | Wholesale & retail | 2026 |
| Murphy Solution Limited | Professional & scientific | 2024 |
| Murray Design Limited | Professional & scientific | 2013 |
| Murry Takeaway Ltd | Hospitality | 2021 |
| Murry's Dessert Ltd | Hospitality | 2025 |
| Murry's Tawa HUT Ltd | Hospitality | 2025 |
| Murshid Bolton Ltd | Hospitality | 2024 |
| Murtaza Food Limited | Hospitality | 2026 |
| Murti Ltd | Other services | 2025 |
| Murti Properties Ltd | Real estate | 2026 |
| MUS (UK) Limited | Wholesale & retail | 2002 |
| Musa ALI Trading Ltd | Wholesale & retail | 2024 |
| MUSA22 Ltd | Wholesale & retail | 2025 |
| Musayb Optics Ltd | Health & social care | 2022 |
| Muscle Factory (Preston) Limited | Wholesale & retail | 2026 |
| Muscle Factory Fight Club Limited | Arts & recreation | 2025 |
| Muscle Factory Group Ltd | Wholesale & retail | 2025 |
| Muscle Factory Ltd | Wholesale & retail | 2023 |
| Muscle Factory Online Limited | Wholesale & retail | 2025 |
| Muscle Fuel Ltd | Wholesale & retail | 2022 |
| Muscle Funk Music Ltd | Information & communication | 2020 |
| Musco Lighting (UK) Limited | Wholesale & retail | 1994 |
| Muse Coffee & Bakes Ltd | Hospitality | 2026 |
| Muse Group Holdings Limited | Financial services | 2024 |
| Muse Media Trading Limited | Professional & scientific | 2025 |
| Mushaa Ltd | Wholesale & retail | 2023 |
| Mushroom Apps Ltd | Extraterritorial | 2023 |
| Musicmagpie Limited | Professional & scientific | 2020 |
| Muslim Empowerment Solutions Ltd | Wholesale & retail | 2023 |
| Muslim Home Academy Ltd | Education | 2025 |
| Muslim Women's Youth, Sport & Education Forum, Bolton C.I.C. | Education | 2026 |
| Mustard Seed Media Ltd | Information & communication | 2025 |
| Mutt & Co UK Ltd | Wholesale & retail | 2022 |
| Mutt Club Ltd | Other services | 2020 |
| Mutual Gain Consulting Limited | Professional & scientific | 2023 |
| MUZ Domestics Limited | Wholesale & retail | 2025 |
| Muzza & Sons Limited | Wholesale & retail | 2017 |
| Muzzy Ltd | Wholesale & retail | 2012 |
| MV Investments Lostock Limited | Financial services | 2025 |
| MV Nails Horwich Ltd | Other services | 2023 |
| MV Play Limited | Financial services | 2022 |
| Mvgontime Limited | Transport & logistics | 2026 |
| MVO Holdings Limited | Administrative & support | 2021 |
| MVR Developments Limited Liability Partnership | | 2007 |
| MVW Ltd | Professional & scientific | 2025 |
| MW Health Ltd | Health & social care | 2023 |
| MW Installations Ltd | Construction | 2021 |
| MW NON Exec Services Ltd | Professional & scientific | 2018 |
| MW Padel Limited | Arts & recreation | 2026 |
| MW Paving Services Limited | Construction | 2026 |
| MW Project Services Limited | Construction | 2018 |
| MW Properties (Hyde) Ltd | Real estate | 2021 |
| MW5 Star Coaching Limited | Education | 2023 |
| MWA Drivers Agency Ltd | Administrative & support | 2010 |
| MWA Eco Systems Ltd | Construction | 2013 |
| MWA Group Limited | Financial services | 2021 |
| MWK Consultants Limited | Financial services | 2015 |