| Mcsm Holdings Ltd | Real estate | 2025 |
| MCW Property Care Limited | Construction | 2026 |
| Mcwgb Ltd | Wholesale & retail | 2019 |
| MD Capital Management Ltd | Real estate | 2024 |
| MD Construction & Trades Ltd | Construction | 2021 |
| MD Construction (Leeds) Limited | Construction | 2008 |
| MD Fisheries Ltd | Hospitality | 2025 |
| MD Holdings 2024 Limited | Financial services | 2023 |
| MD Holdings North Ltd | Professional & scientific | 2020 |
| MD Linens Ltd | Wholesale & retail | 2017 |
| MD Miroslav Ltd | Transport & logistics | 2026 |
| MD Paramedical Services Limited | Health & social care | 2013 |
| MD Steelpans Ltd | Manufacturing | 2015 |
| MD Taxigo Ltd | Transport & logistics | 2025 |
| Mdczi Ltd | Wholesale & retail | 2025 |
| MDH Trade Ltd | Wholesale & retail | 2025 |
| MDK Logistics Ltd | Transport & logistics | 2025 |
| MDL Cleaning Solutions Ltd | Administrative & support | 2024 |
| MDM Electrical & Civils Limited | Construction | 2025 |
| Mdpharma Ltd | Health & social care | 2023 |
| MDR Care Services Ltd | Health & social care | 2023 |
| MDS Lofts Limited | Construction | 2020 |
| MDS Plastering & Dry-Lining Services Ltd | Construction | 2018 |
| MDW (Eastbourne) Limited | Construction | 2010 |
| Meachams Taverns Limited | Hospitality | 2021 |
| Meadow Inns Ltd | Hospitality | 2016 |
| Meadowhall Properties Limited | Real estate | 2002 |
| Meadowlands Consultancy Limited | Professional & scientific | 2025 |
| Meadowlands Limited | Financial services | 2025 |
| Meadows Leisure Limited | Hospitality | 2025 |
| Meadows Spring Limited | Real estate | 2018 |
| Meal Deal Club Ltd | Other services | 2025 |
| Mealpro.Co Ltd | Manufacturing | 2023 |
| Meat One Limited | Wholesale & retail | 2017 |
| Meatco Ltd | Wholesale & retail | 2026 |
| MEC - Air (Pneumatics & Hydraulics) Limited | Manufacturing | 1987 |
| Mecki Ltd | Wholesale & retail | 2026 |
| MED Constructions Group Ltd | Construction | 2020 |
| Medas Media Limited | Information & communication | 2023 |
| Medcare Clinic Ltd | Health & social care | 2022 |
| Medcare Complete Ltd | Administrative & support | 2014 |
| Medellin Properties Ltd | Real estate | 2024 |
| Medfix Clinic Ltd | Health & social care | 2024 |
| Medi Health & Care Ltd | Health & social care | 2020 |
| Medi-Arch Ltd | Wholesale & retail | 2018 |
| Medi-Sal Ltd | Health & social care | 2024 |
| Media Arts & Culture Ltd | Administrative & support | 2017 |
| Media Reads Limited | Professional & scientific | 2016 |
| Media Space Limited | Administrative & support | 1980 |
| Media Vita Holdings Ltd | Financial services | 2025 |
| Mediation Service Yorkshire Limited | Administrative & support | 2025 |
| Medical Research Centre UK Limited | Professional & scientific | 2026 |
| Medical Xpress Limited | Wholesale & retail | 2021 |
| Medicals Direct Limited | Health & social care | 2015 |
| Medicare Solutions Limited | Health & social care | 2014 |
| Medichem (Wibsey) Limited | Wholesale & retail | 2011 |
| Medicinal Mother Ltd | Wholesale & retail | 2025 |
| Medicines Academy Ltd | Education | 2016 |
| Medicozum Limited | Wholesale & retail | 2023 |
| Medina (South) Limited | Real estate | 2017 |
| Medina Food Group Limited | Manufacturing | 2009 |
| Medipharm (Bradford) Limited | Wholesale & retail | 2008 |
| Medipharm (Leeds) Ltd | Real estate | 2007 |
| Medipharma HC Limited | Wholesale & retail | 2024 |
| Mediping Limited | Information & communication | 2021 |
| Mediqas Assets Ltd | Financial services | 2025 |
| Mediqas Group Ltd | Health & social care | 2022 |
| Mediqas Medical Services Ltd | Health & social care | 2025 |
| Mediqas Training School Ltd | Education | 2025 |
| Medival (Yorkshire) Ltd | Wholesale & retail | 2021 |
| Medival Locums Ltd | Health & social care | 2022 |
| Medopt Locum Limited | Health & social care | 2017 |
| Medsure Logistics Ltd | Transport & logistics | 2026 |
| Medsxperts Ltd | Health & social care | 2025 |
| Meduk (Leeds) Ltd | Wholesale & retail | 2009 |
| Medwest Limited | Wholesale & retail | 2012 |
| Meem International BFD Ltd | Wholesale & retail | 2010 |
| Meem International Traders Ltd | Financial services | 2011 |
| Meem Property Limited | Real estate | 2025 |
| Meenu G Birmingham Limited | Wholesale & retail | 2017 |
| Meenu G Bradford Limited | Wholesale & retail | 2019 |
| Meenu G Limited | Wholesale & retail | 2016 |
| Meenu G London Limited | Wholesale & retail | 2016 |
| Meenu G Online Limited | Wholesale & retail | 2016 |
| Meer Brothers Ltd | Wholesale & retail | 2026 |
| Mega Bytes IT Limited | Information & communication | 2024 |
| Mega Bytes Limited | Hospitality | 2024 |
| Mega CNC Ltd | Manufacturing | 2020 |
| Mega Construction Group Ltd | Construction | 2023 |
| Mega Discount Store Ltd | Wholesale & retail | 2019 |
| Mega Finance Limited | Manufacturing | 2016 |
| Mega Parmoz & Currys Ltd | Hospitality | 2025 |
| Mega Pulse Ltd | Wholesale & retail | 2024 |
| Mega Value Events Group Ltd | Arts & recreation | 2025 |
| Megabuy Store Ltd | Wholesale & retail | 2026 |
| Megakk Ltd | Hospitality | 2026 |
| Megaplay (Bradford) Ltd | Arts & recreation | 2015 |
| Megastruct Engineering Solutions Ltd | Professional & scientific | 2023 |
| Megna Restaurant Selby Limited | Hospitality | 2020 |
| Megna Takeaway Limited | Hospitality | 2020 |