| MCR Inventories Ltd | Professional & scientific | 2026 |
| MCR Secure Ltd | Manufacturing | 2020 |
| MCR Spuds Ltd | Hospitality | 2025 |
| MCR UK Properties Ltd | Real estate | 2025 |
| Mcrailt Site Engineers Limited | Professional & scientific | 2014 |
| Mcrprojectacademy Ltd | Professional & scientific | 2024 |
| MCS Manchester Car Surgery Limited | Wholesale & retail | 2016 |
| MCT Health Company Ltd | Arts & recreation | 2025 |
| MCT Recovery Ltd | Transport & logistics | 2026 |
| MCW Media Ltd | Information & communication | 2025 |
| MD Exclusive Ltd | Administrative & support | 2026 |
| MD Foam & Fiber Filling Ltd | Manufacturing | 2026 |
| MD Haus Ltd | Real estate | 2026 |
| MD Rental Properties Limited | Real estate | 2022 |
| MD Security Services Limited | Administrative & support | 2022 |
| MD4 Ltd | Real estate | 2024 |
| MDA Accountancy Ltd | Professional & scientific | 2024 |
| MDC Team Ltd | Water & waste | 2025 |
| MDH Advisory Ltd | Professional & scientific | 2024 |
| MDI Auto Hub Ltd | Wholesale & retail | 2024 |
| Mdil Solutions Limited | Professional & scientific | 2021 |
| MDM Medics Ltd | Health & social care | 2023 |
| MDM Trading NW Ltd | Wholesale & retail | 2023 |
| MDR Installations (NW) Limited | Construction | 2023 |
| MDS One Limited | Information & communication | 2025 |
| MDS Painting Contractors Ltd | Construction | 2025 |
| Mdsa BD Limited | Wholesale & retail | 2016 |
| Mdsupplies Ltd | Wholesale & retail | 2025 |
| ME & YOU Outlet Ltd | Wholesale & retail | 2025 |
| MEA Electrical Services Ltd | Construction | 2025 |
| Meadowgate Developments Limited | Construction | 2017 |
| Meadway Developments Limited | Construction | 2016 |
| Meah Property Limited | Real estate | 2025 |
| Meakin Consulting Limited | Professional & scientific | 2016 |
| Meat in the Middle Oldham Ltd | Wholesale & retail | 2020 |
| Meble UK Ltd | Manufacturing | 2016 |
| MEC Consultant and Investments UK Limited | Financial services | 2021 |
| Mecca Enterprise Ltd | Wholesale & retail | 2023 |
| Mechafx Limited | Financial services | 2024 |
| Mechnet Cabling Solutions Ltd | Construction | 2017 |
| Mechplant Ltd | Extraterritorial | 2021 |
| Mechplant North West Limited | Administrative & support | 2002 |
| Medcure Ltd | Wholesale & retail | 2011 |
| Medheal Ltd | Wholesale & retail | 2022 |
| Media Makeover Limited | Arts & recreation | 2007 |
| Medical British Academy Ltd | Health & social care | 2019 |
| Medical Injuries Reports Limited | Health & social care | 2015 |
| Medical Role Players (UK) Ltd | Administrative & support | 2010 |
| Medicals (UK) Ltd | Professional & scientific | 2014 |
| MEDICINES4U Healthcare Ltd | Health & social care | 2025 |
| Medidrive UK Limited | Other services | 2025 |
| Medincharm Limited | Health & social care | 1998 |
| Medipharm Solutions Limited | Health & social care | 2023 |
| Medipro Aesthetics Ltd | Other services | 2015 |
| Medisecure RX Limited | Professional & scientific | 2024 |
| Medisen Ltd | Health & social care | 2022 |
| Mediship Limited | Transport & logistics | 2026 |
| Medley Developments Ltd | Manufacturing | 2020 |
| Medlock Care Ltd | Health & social care | 2024 |
| Medlock Day Nursery Ltd | Health & social care | 2019 |
| Medlock Fit OUT Limited | Construction | 2022 |
| Medlock FRB Limited | Construction | 2006 |
| Medlock FRB Trustees Limited | Financial services | 2020 |
| Medlock Medical Limited | Manufacturing | 2003 |
| Medlock MOT Centre Limited | Wholesale & retail | 2017 |
| Medlock Security Ltd | Administrative & support | 2025 |
| Medlock Tax Ltd | Professional & scientific | 2026 |
| Mednatty Care Services Limited | Administrative & support | 2023 |
| MEDS2U Limited | Health & social care | 2014 |
| Medshealthcare Ltd | Health & social care | 2024 |
| Medval Pharma Limited | Administrative & support | 2015 |
| Meerkat TV Media Ltd | Information & communication | 2012 |
| Meerus Fashion Ltd | Wholesale & retail | 2024 |
| Meet the Flockers Limited | Wholesale & retail | 2018 |
| Meezan Real Estate Ltd | Real estate | 2022 |
| Mega Monster Music Ltd | Arts & recreation | 2009 |
| Mega Value Online Ltd | Wholesale & retail | 2020 |
| Megagrip Ltd | Manufacturing | 2017 |
| Meghna Catering Limited | Hospitality | 2021 |
| Mehak Travel Ltd | Administrative & support | 2020 |
| Mehar Private Limited | Hospitality | 2024 |
| Mehar Store's Ltd | Wholesale & retail | 2025 |
| Mehar UK Transport Limited | Transport & logistics | 2025 |
| Mehdi Traders Ltd | Wholesale & retail | 2024 |
| Mehedin Namani Limited | Real estate | 2024 |
| Mehjabeen Ltd | Wholesale & retail | 2025 |
| Mehriyyah Ltd | Real estate | 2024 |
| MEK Travels Ltd | Transport & logistics | 2025 |
| Mekhong Thai Kitchen Ltd | Hospitality | 2026 |
| Mela Fashions Ltd | Wholesale & retail | 2019 |
| Mela Market Limited | Wholesale & retail | 2026 |
| Melasave Limited | Manufacturing | 2025 |
| Melbourne Commercial Centre Company Limited | Households | 1997 |
| Melbourne Electrical Contractors Ltd | Construction | 2026 |
| Melody Minds Education Ltd | Information & communication | 2026 |
| Melting House Limited | Hospitality | 2017 |
| Melvin Technical Services Limited | Professional & scientific | 2009 |
| Mema Services Limited | Construction | 2023 |
| Mema Steel Fixing Ltd | Construction | 2023 |
| Membrane Installation Services Ltd | Construction | 2023 |