| Meathop Grange Management Company Limited | Households | 1993 |
| MEC Group Private Ltd | Wholesale & retail | 2024 |
| MED & Beauty Clinic Ltd. | Other services | 2017 |
| Medcomms Ltd | Information & communication | 2022 |
| Mede Corporation Limited | Information & communication | 2021 |
| Mede International Ltd | Administrative & support | 2024 |
| Medeway Associates Trade Ltd | Construction | 2019 |
| Medheightrescue Ltd | Administrative & support | 2012 |
| Media Signs Print Limited | Manufacturing | 2015 |
| Mediamatters Ltd | Wholesale & retail | 2025 |
| Median Homes Limited | Real estate | 2000 |
| Medicom Systems Limited | Information & communication | 1988 |
| Medicoree Limited | Health & social care | 2026 |
| Mediply Limited | Wholesale & retail | 2000 |
| Medispa Lytham Clinic Limited | Professional & scientific | 2016 |
| Mediteran Gulet Sailing Limited | Extraterritorial | 2022 |
| Medlab Safety Supplies Limited | Manufacturing | 2022 |
| Medlife R&S Care Ltd | Health & social care | 2021 |
| Medocia Ltd | Wholesale & retail | 2026 |
| Meeting House Lane Property Limited | Construction | 2024 |
| Megabites Catering Ltd | Hospitality | 2000 |
| Megawolf Solutions Ltd | Information & communication | 2013 |
| Meherin UK Limited | Hospitality | 2023 |
| Mehta Real Estates Ltd | Real estate | 2024 |
| Meika FOX Property Rental Limited | Real estate | 2025 |
| Mekali Ltd | Hospitality | 2025 |
| Melli Limited | Hospitality | 2010 |
| Melling Asset Management Ltd | Real estate | 2023 |
| Mellon Holdings Limited | Other services | 2023 |
| Mellor Media UK Limited | Information & communication | 2020 |
| Melrose Productions Limited | Information & communication | 2012 |
| Melty Rainbows Ltd | Wholesale & retail | 2021 |
| MEM Roofing Services Ltd | Construction | 2020 |
| Memorise Care Ltd | Administrative & support | 2026 |
| MEN Matter Blackpool CIC | Health & social care | 2024 |
| Mental Healthcare Services Ltd | Health & social care | 2025 |
| Mentat Software Limited | Information & communication | 2014 |
| MEP BIM Ltd | Professional & scientific | 2018 |
| MEP Costs Consultants Limited | Administrative & support | 2019 |
| Merchant Account Solutions Limited | Other services | 2003 |
| Mercuri (Architectural Sales) Ltd | Professional & scientific | 2009 |
| Mercury Arts Ltd | Manufacturing | 2022 |
| Mercury Trading Cards Limited | Wholesale & retail | 2023 |
| Mercy Facilities Limited | Hospitality | 2024 |
| Mere Beck Limited | Agriculture & fishing | 2006 |
| Mereside Your Community CIC | Health & social care | 2025 |
| Meridian Media Ltd | Information & communication | 2024 |
| Meriweather Limited | Professional & scientific | 2021 |
| Merrill Briggs Ltd | Transport & logistics | 2025 |
| Merriness Coffee Ltd | Wholesale & retail | 2024 |
| Merry SEE Marine Limited | Extraterritorial | 2024 |
| Mesa Education Ltd | Administrative & support | 2024 |
| Mesquer Properties Limited | Real estate | 2010 |
| MET Park Bays Ltd | Wholesale & retail | 2025 |
| Metabolic London Limited | Arts & recreation | 2015 |
| Metabolic Makeover Ltd | Arts & recreation | 2012 |
| Metaforms Design Limited | Professional & scientific | 2025 |
| Metalwork Systems Limited | Manufacturing | 2010 |
| Metatechnics Limited | Information & communication | 2010 |
| Methosp Limited | Professional & scientific | 2014 |
| Metisseo Limited | Information & communication | 2021 |
| Metric Safety Decking Ltd | Construction | 2024 |
| Metric Scaffolding Ltd | Construction | 2024 |
| Metro Computers UK Limited | Extraterritorial | 2014 |
| Metro House Limited | Real estate | 1997 |
| Metroforge UK Limited | Information & communication | 1994 |
| MF Jackson Ltd | Professional & scientific | 2023 |
| MFC Innovation Limited | Administrative & support | 2012 |
| MFD Aerosystems Ltd | Information & communication | 2012 |
| Mfdc Ltd | Information & communication | 2011 |
| MFE Pipework Services Ltd | Professional & scientific | 2020 |
| MFJ Consulting Ltd | Information & communication | 2025 |
| MG Datacommunications Limited | Information & communication | 2007 |
| MG Legal Solicitors Ltd | Professional & scientific | 2021 |
| MG Products UK Ltd | Wholesale & retail | 2025 |
| MGI Projects Limited | Construction | 2024 |
| MGK Mitchell Butchers Limited | Hospitality | 2013 |
| MGM Rigging Ltd | Mining & quarrying | 2017 |
| MGS Software Limited | Information & communication | 2007 |
| MH Properties (Blackpool) Ltd | Real estate | 2019 |
| MH Retail Limited | Wholesale & retail | 2025 |
| MH Wholesale & Logistics Limited | Wholesale & retail | 2025 |
| MHS Trading Solutions Ltd | Wholesale & retail | 2024 |
| Mi-Flues EOT Trustee Limited | Financial services | 2023 |
| Mi-Flues Ltd. | Manufacturing | 1996 |
| Micei International Limited | Extraterritorial | 2021 |
| Michael Camp Limited | Information & communication | 2015 |
| Michael Connolly Financial Consultancy Ltd | Financial services | 2025 |
| Michael Cruddas Electrical Ltd | Construction | 2012 |
| Michael Cuddy Property Ltd. | Administrative & support | 2020 |
| Michael Hope Haulage Limited | Transport & logistics | 2013 |
| Michele Scorcia Limited | Information & communication | 2015 |
| Michelle Nordwind Associates Limited | Real estate | 2018 |
| Mickeys Discount Carpets Ltd | Wholesale & retail | 2014 |
| Micky Fanns Limited | Hospitality | 2025 |
| Microtech Technologies Limited | Wholesale & retail | 2018 |
| Middleton Grovener Ltd | Wholesale & retail | 2025 |
| Midgard Meads Ltd | Hospitality | 2025 |
| Midgeland Road Garage Limited | Wholesale & retail | 2017 |
| Midvale FOX Ltd | Wholesale & retail | 2025 |