| Mr.Matelock Ltd | Other services | 2020 |
| Mrakhtarpropertiesltd@Gmail.Com Ltd | Construction | 2026 |
| MRB Limited | Construction | 2017 |
| Mrdub Campers Ltd | Manufacturing | 2023 |
| MRF Glass Recycling Limited | Water & waste | 2012 |
| MRF Trading Ltd | Administrative & support | 2026 |
| MRF Training Solutions Ltd | Education | 2022 |
| Mrhvs Limited | Professional & scientific | 2019 |
| Mrtoybox Ltd | Wholesale & retail | 2006 |
| MRZ Group Ltd | Administrative & support | 2024 |
| MS Drywall Ltd | Construction | 2021 |
| MS Financial Consultancy Ltd | Professional & scientific | 2020 |
| MS Holdings Yorkshire Ltd | Real estate | 2020 |
| MS Motors Yorkshire Ltd | Wholesale & retail | 2017 |
| MS Transmissions Ltd | Wholesale & retail | 2013 |
| MSB Services (Yorkshire) Ltd | Construction | 2026 |
| MSC Security Solutions Limited | Construction | 2020 |
| MSI Freehold Ltd | Real estate | 2026 |
| MSI Legal Ltd | Professional & scientific | 2023 |
| MSN Accounting Limited | Professional & scientific | 2003 |
| MSN Mechanical & Plumbing Ltd | Construction | 2025 |
| MSO Consulting Ltd | Professional & scientific | 2025 |
| Mtal Holdings Ltd | Real estate | 2023 |
| MTD Molsitho Limited | Health & social care | 2018 |
| MTP Innovations Limited | Administrative & support | 2010 |
| MTS T/As Cafe' Capri Ltd | Hospitality | 2025 |
| MTT Energy Limited | Professional & scientific | 2012 |
| MTT Technik UND Service Limited | Construction | 2007 |
| MTW Architectural Holdings Limited | Extraterritorial | 2019 |
| MTW EOT Holdings Limited | Financial services | 2022 |
| MTW EOT Trustees Limited | Financial services | 2023 |
| MTW Property Investment Limited | Extraterritorial | 2019 |
| Muck OFF Ltd | Water & waste | 2025 |
| Muddy Pawz Serenity Ltd | Other services | 2023 |
| Mudraproperty Ltd | Real estate | 2024 |
| Muetzel Consulting & Support Ltd. | Professional & scientific | 2008 |
| Mughal Brothers Limited | Wholesale & retail | 2024 |
| Mughal Spice (Wigan) Ltd | Hospitality | 2019 |
| Muhammad Waleed Ltd | Wholesale & retail | 2025 |
| Mukta Balti Limited | Hospitality | 2014 |
| Mullen Property & Lettings Limited | Real estate | 2018 |
| Multi Aero Parts Limited | Manufacturing | 2018 |
| Multi Health Medical Services UK Limited | Health & social care | 2008 |
| Multi Marque Production Engineering Limited | Manufacturing | 1991 |
| Multinational Healthcare Limited | Health & social care | 2023 |
| Multiparts Europe Ltd | Wholesale & retail | 2012 |
| Multiposting Ltd | Administrative & support | 2015 |
| Multisensory Environments Limited | Manufacturing | 1997 |
| Mummyfit (Wakefield & Morley) Ltd | Arts & recreation | 2020 |
| Mummyfit Franchise Ltd | Arts & recreation | 2019 |
| Mummyfit Ltd | Arts & recreation | 2015 |
| Mumps Development Ltd | Construction | 2022 |
| Munchez Tasty Point Ltd | Hospitality | 2022 |
| Munir Auto Traders Limited | Wholesale & retail | 2025 |
| Munova Group Ltd | Wholesale & retail | 2026 |
| Munro PSV Limited | Wholesale & retail | 2016 |
| Munya Imaging Limited | Health & social care | 2021 |
| Murrayfield Kendal Associates Ltd | Professional & scientific | 2023 |
| Musa & Miraal Limited | Health & social care | 2024 |
| Music for Brass Limited | Arts & recreation | 1986 |
| Muyiwa Areo Ministry International Ltd | Other services | 2026 |
| MV Properties Ltd | Real estate | 2019 |
| MW Electrical Group Limited | Construction | 2026 |
| MWA International Ltd | Wholesale & retail | 2023 |
| MWH Football Academy Ltd | Arts & recreation | 2025 |
| MWS Practitioners Limited | Health & social care | 2022 |
| My Asset Holdings Ltd | Real estate | 2025 |
| My Eco Baby Community Interest Company | Wholesale & retail | 2020 |
| My Health, OUR Way CIC | Health & social care | 2026 |
| My Horse Box Ltd | Wholesale & retail | 2016 |
| My Hot TUB Mover Ltd | Transport & logistics | 2021 |
| My Hot TUB Trader Ltd | Wholesale & retail | 2022 |
| My It-Fs Ltd. | Other services | 2014 |
| My Law Ltd | Professional & scientific | 2022 |
| My Personal Finance Director Limited | Financial services | 2020 |
| My Pharma Limited | Wholesale & retail | 2026 |
| My Secure Self Store.Com Limited | Transport & logistics | 2018 |
| My Spider Crane Ltd | Administrative & support | 2024 |
| Mybrewbot Limited | Manufacturing | 2019 |
| Myerscough Developments Limited | Administrative & support | 1974 |
| Mygreenelectricity Ltd | Construction | 2023 |
| MYK Fast Food Ltd | Hospitality | 2024 |
| MYK Lettings Ltd | Real estate | 2025 |
| MYK Performance Ltd | Wholesale & retail | 2024 |
| Myluna Limited | Wholesale & retail | 2014 |
| Mynarvia Limited | Administrative & support | 2004 |
| Myncare Solutions Ltd | Real estate | 2016 |
| Myneuus Ltd | Other services | 2020 |
| Mynt Holdings Ltd | Financial services | 2019 |
| Mysing Care Limited | Health & social care | 2015 |
| Mysing Development Capital Limited | Financial services | 2018 |
| Mysing Investments 1 Limited | Administrative & support | 2014 |
| Mysing Investments 2 Limited | Administrative & support | 2014 |
| Mysing Investments 3 Limited | Administrative & support | 2014 |
| Mysing Investments 4 Limited | Administrative & support | 2014 |
| N & S Auto Services Limited | Wholesale & retail | 2010 |
| N & S Talbot Electrical Limited | Construction | 2010 |
| N and C Solutions Ltd | Professional & scientific | 2025 |
| N Butt Storage & Removals Limited | Transport & logistics | 2024 |
| N J Goodrum (Mediation Services) Limited | Professional & scientific | 2013 |