| Mdtok Limited | Professional & scientific | 2025 |
| MDU Limited | Wholesale & retail | 2024 |
| MDU Ventures Limited | Wholesale & retail | 2026 |
| MDW Property Holdings Ltd | Real estate | 2025 |
| MDX Consulting Ltd | Professional & scientific | 2024 |
| MDX Legal Ltd | Professional & scientific | 2026 |
| MDY Clothing Ltd | Wholesale & retail | 2025 |
| Mdy‘S Development Ltd | Real estate | 2025 |
| Meade Law Holdings Limited | Financial services | 2018 |
| Meade Law Ltd | Professional & scientific | 2009 |
| Meadow Hill Education and Arts Limited | Education | 2007 |
| Meadowcroft Barns Limited | Real estate | 2017 |
| Meadowcroft Gardens Limited | Households | 2019 |
| Meadowcroft Residential Schools Limited | Education | 2007 |
| Meadows Cleaning & Maintenance Limited | Administrative & support | 2012 |
| Meadows Handy Moves Ltd | Other services | 2025 |
| Meah Health Limited | Health & social care | 2021 |
| Meakin Properties Limited | Real estate | 2020 |
| Meat N EAT Ltd | Hospitality | 2022 |
| Meats on the Corner Ltd | Wholesale & retail | 2026 |
| MEC - Serv Ltd | Construction | 2006 |
| MEC Management Ltd | Professional & scientific | 2017 |
| MEC Properties (NW) Ltd | Households | 2018 |
| Meca Properties Limited | Real estate | 2023 |
| Mechanical Generator Services Ltd | Manufacturing | 2017 |
| Mechplumb Ltd | Construction | 2024 |
| Meck Logistics Limited | Transport & logistics | 2026 |
| MED Fabs (NW) Ltd | Manufacturing | 2019 |
| MED Innovations and Consulting Ltd | Wholesale & retail | 2011 |
| Medaisell Limited | Information & communication | 2025 |
| Medallion Accountants Limited | Information & communication | 2022 |
| Medcare Aesthetics Ltd | Health & social care | 2022 |
| Medcare Manchester Ltd | Health & social care | 2021 |
| Medex Therapy Limited | Professional & scientific | 2018 |
| Medhill Limited | Administrative & support | 2016 |
| Medi-Swift Ltd | Health & social care | 2010 |
| Media Barn Limited | Professional & scientific | 2015 |
| Media Buzz UK Limited | Manufacturing | 2024 |
| Media Palace Limited | Other services | 2023 |
| Media Pitch (UK) Limited | Manufacturing | 2010 |
| Media Sales UK Limited | Information & communication | 2003 |
| Mediability LLP | | 2011 |
| Mediabridge Communications Ltd | Information & communication | 2024 |
| Medibrain UK Ltd | Education | 2026 |
| Medical ALS Ltd | Health & social care | 2024 |
| Medical and Legal Admin Services Limited | Health & social care | 2010 |
| Medical Link Limited | Health & social care | 2004 |
| Medicentre Bolton Ltd | Health & social care | 2025 |
| Medicina Holdings Limited | Manufacturing | 2011 |
| Medicina Limited | Administrative & support | 1991 |
| Medicium Ltd | Health & social care | 2014 |
| Mediclean Ltd | Administrative & support | 2025 |
| Medico Impact Ltd | Health & social care | 2020 |
| Medico UK Limited | Transport & logistics | 1999 |
| Medifuel Limited | Manufacturing | 2020 |
| Medigen Regulatory Limited | Professional & scientific | 2017 |
| Medihealth (Northern) Limited | Wholesale & retail | 2004 |
| Medilife Healthcare Ltd | Health & social care | 2023 |
| Medilims Ltd | Information & communication | 2016 |
| Medina Abayas Ltd | Wholesale & retail | 2024 |
| Medina Catering Limited | Hospitality | 2017 |
| Medina Dairy Bolton Limited | Wholesale & retail | 2009 |
| Medinsight Services Ltd | Health & social care | 2025 |
| Mediserve Healthcare Limited | Health & social care | 2014 |
| Medispa Suites Limited | Other services | 2025 |
| Medium Properties Ltd | Real estate | 2024 |
| Mediwave U.K. Limited | Manufacturing | 1998 |
| Medix Group Ltd | Wholesale & retail | 2023 |
| Medleaf UK Ltd | Health & social care | 2024 |
| Mednorth Ltd | Wholesale & retail | 2020 |
| Medrab Ltd | Real estate | 2023 |
| Medway Engineering Limited | Manufacturing | 1998 |
| Medway Heating (Bolton) Limited | Construction | 1974 |
| Meedah Childminding Limited | Health & social care | 2025 |
| Meekos Property Solutions Ltd | Real estate | 2024 |
| Meela Dwellings Ltd | Construction | 2025 |
| Meeno Ltd | Wholesale & retail | 2021 |
| Meetech Services Ltd | Manufacturing | 2009 |
| Meez Ltd | Wholesale & retail | 2018 |
| Mega Carpets Ltd | Wholesale & retail | 2015 |
| Mega Driveways Limited | Construction | 2026 |
| Mega Horizon Limited | Administrative & support | 2021 |
| Mega Mart Bolton Ltd | Wholesale & retail | 2023 |
| Mega Mart BOLTON2 Limited | Wholesale & retail | 2025 |
| Mega Physiotherapy Limited | Health & social care | 2025 |
| Mega Stores Ltd | Wholesale & retail | 2026 |
| Megabrickstoys Ltd | Wholesale & retail | 2025 |
| Megan Jane Ltd | Professional & scientific | 2023 |
| Meganoesis Limited | Information & communication | 2025 |
| Megas-Xlr Ltd | Wholesale & retail | 2026 |
| Megh Stores Limited | Wholesale & retail | 2026 |
| Meghji Foods Ltd | Hospitality | 2025 |
| Mehrma CH Limited | Wholesale & retail | 2026 |
| Mehru Ltd | Real estate | 2026 |
| Mehtadology Ltd | Information & communication | 2023 |
| MEL Bluebell UK Limited | Health & social care | 2015 |
| MEL Crabtree Properties Limited | Real estate | 2018 |
| Melbourne 1 Limited | Real estate | 2022 |
| Melbourne 2 Limited | Real estate | 2022 |
| Melbourne 4 Limited | Real estate | 2022 |