| Meanwood Mobility Limited | Wholesale & retail | 2007 |
| Meanwood Preschool Ltd | Education | 2017 |
| Meanwood TAP Rooms Ltd | Hospitality | 2023 |
| Meanwood Valley Mills Limited | Administrative & support | 2015 |
| Meanwood Valley Urban Farm Limited | Agriculture & fishing | 1980 |
| Meat Boutique Limited | Wholesale & retail | 2021 |
| Meaty Treats | | 1995 |
| MEB Holdings Ltd | Manufacturing | 2008 |
| Mecb Holdings Ltd | Financial services | 2022 |
| Mecb Leeds Limited | Hospitality | 2019 |
| Mecb Liverpool Ltd | Hospitality | 2022 |
| Mecb Manchester Ltd | Hospitality | 2022 |
| Mecci Limited | Health & social care | 2023 |
| Mecfix Roofing Limited | Construction | 2014 |
| Mech-Marc Limited | Construction | 2007 |
| Mechanic 2U Ltd | Wholesale & retail | 2024 |
| Mechanical Facilities Services Limited | Construction | 2008 |
| Mechtronic Limited | Administrative & support | 2004 |
| Meckahno Homes Limited | Construction | 2019 |
| MED Assessments Ltd | Health & social care | 2025 |
| MED Frontier Suppliers & Consultancy UK Limited | Wholesale & retail | 2022 |
| MED Greek Food Ltd | Hospitality | 2024 |
| MED Greek Street Food Yorkshire Ltd | Hospitality | 2025 |
| MED Pro ALP Limited | Health & social care | 2012 |
| Medamin ENT Ltd | Health & social care | 2025 |
| Medasil Employee Trustee Limited | Professional & scientific | 2015 |
| Medasil Surgical Limited | Manufacturing | 1974 |
| Medaxis Global Ltd | Health & social care | 2025 |
| Medburn Loan Company Limited | Financial services | 2018 |
| Medburn Street Ltd | Professional & scientific | 2018 |
| Medcare HQ Ltd | Administrative & support | 2019 |
| Medco Foods Ltd | Hospitality | 2025 |
| Medco HC Limited | Health & social care | 2012 |
| Medco Plus Limited | Other services | 2015 |
| Medco Strategies Ltd | Professional & scientific | 2024 |
| Medeh Sharifi Logistics Limited | Transport & logistics | 2025 |
| Meden Consulting Ltd | Administrative & support | 2022 |
| Medfirst Limited | Professional & scientific | 2012 |
| Medguidance Limited | Education | 2014 |
| Medi 4 Ambulance Services Ltd | Transport & logistics | 2015 |
| Medi Bar 1 Ltd | Hospitality | 2026 |
| Medi Food 1 Ltd | Hospitality | 2026 |
| Medi Skincare Ltd | Education | 2021 |
| Medi-Plumb Installations Limited | Construction | 2005 |
| Media City Way Ltd | Professional & scientific | 2022 |
| Media Competitions Limited | Extraterritorial | 2016 |
| Media Hero Limited | Professional & scientific | 2013 |
| Media Hype Ltd | Information & communication | 2016 |
| Media Intelligence Bureau Ltd | Professional & scientific | 2018 |
| Media Mavericks Ltd | Information & communication | 2019 |
| Media Origins Ltd | Information & communication | 2015 |
| Media Players (UK) Limited | Professional & scientific | 2019 |
| Media Punch Limited | Information & communication | 2014 |
| Media Robin Limited | Information & communication | 2021 |
| Mediator X Ltd | Professional & scientific | 2025 |
| Medic FK Health Care Services Ltd | Health & social care | 2022 |
| Medica Research Holdings Limited | Financial services | 2024 |
| Medica Research Limited | Health & social care | 2024 |
| Medical & Legal Associates Limited | Professional & scientific | 2012 |
| Medical & Legal Ltd | Professional & scientific | 2003 |
| Medical Assessment Bureau Ltd | Health & social care | 2026 |
| Medical Equipment Technical Services Limited | Administrative & support | 2017 |
| Medical Investigations Limited | Health & social care | 1993 |
| Medical Negligence Team Law Limited | Professional & scientific | 2021 |
| Medical Negligence Team Limited | Administrative & support | 2010 |
| Medical Network Ltd | Health & social care | 2025 |
| Medical Practice Administration Limited | Administrative & support | 2014 |
| Medical Technology Recruitment Ltd | Administrative & support | 2021 |
| Medical Update Ltd | Education | 2009 |
| Medichem - Northolme Limited | Wholesale & retail | 2009 |
| Medicluke Limited | Health & social care | 2022 |
| Medico Beauty Associates Limited | Health & social care | 2005 |
| Medicoder Software Limited | Information & communication | 2025 |
| Medicolegal Chambers Ltd | Professional & scientific | 2025 |
| Medicolegalgp Limited | Other services | 2021 |
| Medicologic Ltd | Education | 2005 |
| Mediconferences UK Limited | Administrative & support | 2025 |
| Medifine Aesthetics Ltd | Health & social care | 2015 |
| Medifine Shop Ltd | Other services | 2019 |
| Medina City Limited | Construction | 2020 |
| Medina Stores Ltd | Wholesale & retail | 2000 |
| Medipex Limited | Health & social care | 2002 |
| Mediq Consulting Limited | Health & social care | 2025 |
| Mediscan Aesthetics and MSK Ltd | Other services | 2025 |
| Medisculpt Limited | Health & social care | 2006 |
| Medisim Training Ltd | Health & social care | 2020 |
| Mediskin Pro Limited | Wholesale & retail | 2018 |
| Medisoft Limited | Information & communication | 1997 |
| Meditech Group Limited | Health & social care | 1995 |
| Mediterranean Organic Food Ltd | Hospitality | 2021 |
| Medium Scale Wind NO.1 Limited | Energy | 2013 |
| Medivate Ltd | Wholesale & retail | 2014 |
| Mediverse Ltd | Administrative & support | 2025 |
| Mednet Limited | Professional & scientific | 2008 |
| Medora Counselling Ltd | Health & social care | 2024 |
| Medpanda Ltd | Administrative & support | 2025 |
| Medplus Aesthetics Ltd | Wholesale & retail | 2026 |
| Medplus Clinic Ltd | Health & social care | 2022 |
| Medqp Limited | Professional & scientific | 2006 |
| Medran Capital Limited | Professional & scientific | 2023 |