| MUS Housing Ltd | Real estate | 2025 |
| Musa Khan Whipz Limited | Hospitality | 2025 |
| Musa Media Ltd | Information & communication | 2025 |
| Musa's Tandoori Ltd | Hospitality | 2025 |
| Musaimoney Ltd | Transport & logistics | 2018 |
| Musclegun Ltd | Wholesale & retail | 2019 |
| Muse & MAE Limited | Wholesale & retail | 2025 |
| Mused Marketing Ltd | Professional & scientific | 2025 |
| Musemwa Limited | Health & social care | 2020 |
| Musgrave & Sagar Limited | Real estate | 1907 |
| Mushlin Medical Ltd | Health & social care | 2024 |
| Mushsjr Ltd | Professional & scientific | 2017 |
| Music and Arts Production Leeds | Arts & recreation | 2007 |
| Music at Heart CIC | Education | 2023 |
| Music Business Management Ltd | Administrative & support | 2012 |
| Music for Health (Shipley) Ltd | Health & social care | 2010 |
| Music in Schools (York) Ltd | Arts & recreation | 2012 |
| Music Leeds | Administrative & support | 2019 |
| Music Preserved | Arts & recreation | 1987 |
| Music Vine Limited | Information & communication | 2014 |
| Music With Temmykeys Ltd | Education | 2024 |
| Musical Health Technologies Limited | Health & social care | 2023 |
| Musicality Software Limited | Extraterritorial | 2011 |
| Musjul Limited | Health & social care | 2018 |
| Muspic Ltd | Professional & scientific | 2024 |
| Mustang Joinery Limited | Manufacturing | 1981 |
| Mustapha Barbershop Ltd | Other services | 2025 |
| Mustapic Ltd | Other services | 2026 |
| Mustard Business Management Limited | Professional & scientific | 2013 |
| Mustard Innovation Ltd | Professional & scientific | 2022 |
| Mustardtree Partners Ltd | Professional & scientific | 2025 |
| Musti Ltd | Transport & logistics | 2023 |
| Mustofab Global Limited | Professional & scientific | 2026 |
| Musubi (UK) Limited | Hospitality | 2023 |
| Mute Ltd | Information & communication | 2017 |
| Mutengindimambo Limited | Health & social care | 2019 |
| Mutimer Enterprises Limited | Information & communication | 2024 |
| Mutiny Digital Ltd | Professional & scientific | 2026 |
| Mutu Hairdressing Limited | Other services | 2010 |
| Mutual Group Limited | Administrative & support | 2017 |
| Mutungamiri Ltd | Administrative & support | 2026 |
| Muvva Midwife Ltd | Wholesale & retail | 2025 |
| MUZ Properties Ltd | Real estate | 2020 |
| Muzzy Motors Ltd | Transport & logistics | 2025 |
| Muzzy’S MOT Limited | Wholesale & retail | 2024 |
| MV Testing Yorkshire Limited | Construction | 2024 |
| MVE Consultancy Ltd | Professional & scientific | 2022 |
| Mverselabs Limited | Information & communication | 2021 |
| MVP Fire Protection Ltd | Public administration | 2025 |
| MVR Business Services Limited | Professional & scientific | 2016 |
| MVS Contracts Limited | Wholesale & retail | 1992 |
| MVS Daytona Limited | Wholesale & retail | 2008 |
| Mvsaa Ltd | Health & social care | 2024 |
| Mvuf Enterprises Limited | Education | 2023 |
| Mvuk Ltd | Hospitality | 2019 |
| MVW Properties Limited | Real estate | 2018 |
| MW Consultancy Limited | Information & communication | 1993 |
| MW Lawncare Limited | Administrative & support | 2026 |
| MW Lofts & Joinery Ltd | Manufacturing | 2024 |
| MW Motors Garage Limited | Transport & logistics | 2015 |
| MW Property Investors Ltd | Real estate | 2020 |
| MW Traderz Ltd | Wholesale & retail | 2026 |
| MWA Decorating Specialists Limited | Construction | 2013 |
| MWA IQ Ltd | Health & social care | 2024 |
| MWA2017 Limited | Real estate | 2017 |
| Mwdogfood Ltd | Wholesale & retail | 2025 |
| MWG Heating Limited | Construction | 2022 |
| MWP Butcher Hill Ltd | Wholesale & retail | 2025 |
| MWP Church Lane Ltd | Wholesale & retail | 2025 |
| MWP Horbury Ltd | Wholesale & retail | 2025 |
| MWP Morley Ltd | Wholesale & retail | 2025 |
| MWS (Realisations) Limited | Wholesale & retail | 1994 |
| MWS HO Limited | Health & social care | 2021 |
| MWS Transport Limited | Transport & logistics | 2023 |
| MWZ Transport Limited | Transport & logistics | 2022 |
| MX Plus C Ltd | Information & communication | 2023 |
| MXB139 Limited | Professional & scientific | 2025 |
| MXM Houses Ltd | Real estate | 2019 |
| My & AY Properties Limited | Real estate | 2017 |
| My 23 Limited | Manufacturing | 2023 |
| My Abaseen Ltd | Hospitality | 2024 |
| My Asia Limited | Hospitality | 2026 |
| My Barbers (Yorkshire) Ltd | Other services | 2019 |
| My Beauty Matches Ltd. | Wholesale & retail | 2011 |
| My Beauty Spot Limited | Information & communication | 2014 |
| My Bengal Ltd | Hospitality | 2025 |
| My Boiler Pro Ltd | Construction | 2026 |
| My Bombays Ltd | Hospitality | 2025 |
| My Caesars Kitchen Ltd | Hospitality | 2025 |
| My Cheeky Venture Ltd | Wholesale & retail | 2021 |
| My Chicken Express Armley Ltd | Hospitality | 2021 |
| My Cinnamon Lounge Limited | Hospitality | 2025 |
| My City WOK Limited | Hospitality | 2021 |
| My Cleaners Leeds Ltd | Administrative & support | 2025 |
| My Education Consultancy Ltd | Education | 2020 |
| My EYE Private Clinic Limited | Health & social care | 2026 |
| My EYE World Ltd | Health & social care | 2025 |
| My Favourite Kitchen Leeds Limited | Hospitality | 2021 |
| My First JOB Limited | Professional & scientific | 2022 |
| My Fitness Studio Limited | Arts & recreation | 2025 |