| Mousa Ltd | Health & social care | 2024 |
| Move Maker Limited | Real estate | 2000 |
| Movemaker Lettings Ltd | Real estate | 2015 |
| Moveout Data Ltd | Professional & scientific | 2012 |
| Moveout Data Services Ltd | Professional & scientific | 2014 |
| Moving Properties Group Ltd | Real estate | 2021 |
| Moxon 1556 Ltd | Manufacturing | 1993 |
| Moyal Medical Group Limited | Health & social care | 2025 |
| Mozz Limited | Professional & scientific | 2010 |
| MP Estate Solutions Ltd | Real estate | 2017 |
| MPB Eats Ltd | Hospitality | 2025 |
| MPC Plastering & General Building Ltd | Construction | 2025 |
| MPH Building Systems Limited | Manufacturing | 2000 |
| MPH Productions Limited | Administrative & support | 2010 |
| MPN 2024 UK Ltd | Information & communication | 2025 |
| MPR Fire Solutions Ltd | Public administration | 2019 |
| Mqas Europe Ltd | Construction | 2015 |
| MQS Pharm Ltd | Health & social care | 2016 |
| MR & MRS Dunn Creative Content Limited | Professional & scientific | 2018 |
| MR Angus Limited | Hospitality | 2026 |
| MR Bluee Ltd | Wholesale & retail | 2024 |
| MR Chips Dalton Ltd | Hospitality | 2025 |
| MR Feast UK Ltd | Hospitality | 2024 |
| MR Happy Limited | Hospitality | 2019 |
| MR Juicy Ltd | Hospitality | 2025 |
| MR Malik Traders Limited | Wholesale & retail | 2025 |
| MR Powa Ltd | Energy | 2023 |
| MR RESHOEVN8R Ltd | Administrative & support | 2025 |
| MR Roy's Maths Tuition Hub Limited | Education | 2026 |
| MR Sanjiv Jari Limited | Health & social care | 2019 |
| MR Transit Ltd | Administrative & support | 2023 |
| MR Vapes Huddersfield Ltd | Wholesale & retail | 2025 |
| MR Woody Woods Ltd | Arts & recreation | 2021 |
| MR. Satellite Ltd | Wholesale & retail | 2025 |
| MRA Maintenance Ltd | Construction | 2023 |
| Mrdtech Limited | Wholesale & retail | 2016 |
| MRF Consultants Ltd | Information & communication | 2021 |
| Mrhk Holdings Limited | Financial services | 2025 |
| Mriscan Ltd | Professional & scientific | 2026 |
| Mrmadden Ltd | Professional & scientific | 2025 |
| MRW Engineering Services Limited | Construction | 2019 |
| MS Cookers & Boilers Limited | Construction | 2019 |
| MS Denti Corp Ltd | Health & social care | 2025 |
| MS Malhi Ltd | Transport & logistics | 2014 |
| MS Prestige Limited | Wholesale & retail | 2021 |
| MS Prestige Motors Ltd | Wholesale & retail | 2022 |
| MS Sensory Toys Ltd | Wholesale & retail | 2020 |
| MSA Mpharm Ltd | Professional & scientific | 2014 |
| MSA Properties (Huddersfield) Ltd | Real estate | 2023 |
| MSA Tyres Ltd | Wholesale & retail | 2025 |
| Msaa Optical Ltd | Health & social care | 2025 |
| MSE Trading Limited | Wholesale & retail | 2020 |
| MSK Estates Ltd | Real estate | 2006 |
| MSK Properties Holdings Ltd | Real estate | 2022 |
| MSK Systems Ltd | Administrative & support | 2025 |
| Mslk Limited | Administrative & support | 2025 |
| MSM Logistics Huddersfield Limited | Transport & logistics | 2018 |
| Msmar Properties Ltd | Real estate | 2019 |
| MSN Ijahra Trading Limited | Wholesale & retail | 2022 |
| Msnjh Ltd | Administrative & support | 2019 |
| MSR Labs Limited | Manufacturing | 2020 |
| Msrk Asset Management Ltd | Real estate | 2024 |
| Mssb Properties Ltd | Real estate | 2021 |
| Mssc Projects Limited | Construction | 2015 |
| Mssound Ltd | Administrative & support | 2019 |
| MT Rightway Ltd | Transport & logistics | 2024 |
| Mt-Enterprises Ltd | Wholesale & retail | 2021 |
| MTE Associates Ltd | Other services | 2014 |
| Mtex Engineering Limited | Professional & scientific | 2014 |
| Mtix Ltd | Manufacturing | 2011 |
| MTN Xxix Limited | Health & social care | 2022 |
| MU Design Limited | Professional & scientific | 2024 |
| Mucoda Ltd | Wholesale & retail | 2021 |
| Mudasir Bargains Ltd | Wholesale & retail | 2022 |
| Muds Care Limited | Health & social care | 2015 |
| Mugadza & Milon Ltd | Water & waste | 2025 |
| Mugwort Ltd | Wholesale & retail | 2025 |
| MUH Locums Ltd | Health & social care | 2018 |
| MUH Properties Hudds Ltd | Real estate | 2025 |
| Muhammad Umar Limited | Health & social care | 2008 |
| Muhkam Ltd | Professional & scientific | 2022 |
| Mukesh's Manors Ltd | Real estate | 2026 |
| Mukhzi Trading Ltd | Wholesale & retail | 2022 |
| Muko DEW Ltd | Wholesale & retail | 2026 |
| Mulligan Rentals Limited | Construction | 2016 |
| Multi Comfort Ltd | Manufacturing | 2025 |
| Multi Pass Fitness Ltd | Arts & recreation | 2025 |
| Multi Solution Limited | Wholesale & retail | 2025 |
| MUM on the Run Limited | Professional & scientific | 2024 |
| Mumbai Spice Restaurant Ltd | Hospitality | 2010 |
| Mumskitchen Group Ltd | Hospitality | 2020 |
| Mumtaz HP International Ltd | Wholesale & retail | 2023 |
| Munchies Pizza Bar Ltd | Hospitality | 2021 |
| Muntech Consultancy Ltd | Administrative & support | 2017 |
| Murdoch-Williams Limited | Hospitality | 2026 |
| Murphy IT Limited | Information & communication | 2013 |
| Murtza Optical Ltd | Health & social care | 2023 |
| MUS Optics Limited | Health & social care | 2023 |
| Muscle King Nutrition Ltd | Wholesale & retail | 2024 |
| Muscle World Ltd | Arts & recreation | 2024 |