| MCH (Dragoon Court Block C) Developments Ltd | Real estate | 2026 |
| MCH (Dragoon Court) Developments Ltd | Real estate | 2025 |
| MCH Consultancy Limited | Information & communication | 2021 |
| MCH Diamond Property Ltd | Real estate | 2020 |
| Mchale Investments Limited | Real estate | 2000 |
| Mchanner Ltd | Real estate | 2026 |
| Mcinnes Technical Services Ltd | Professional & scientific | 2018 |
| Mcintosh Mortgages & Associates Ltd | Financial services | 2022 |
| MCK Logistics Ltd | Transport & logistics | 2024 |
| Mckee Fabrications Ltd | Manufacturing | 2021 |
| Mckee Gallery Ltd | Arts & recreation | 2021 |
| Mckenzie Financial Services Ltd | Financial services | 2003 |
| Mckoy Sports and Entertainment Ltd | Arts & recreation | 2025 |
| MCL Electrical Solutions Limited | Construction | 2024 |
| MCL Global Ltd | Construction | 2026 |
| Mclaughlin Strategic Consulting Limited | Professional & scientific | 2024 |
| Mcleod Carpets Limited | Wholesale & retail | 2001 |
| Mclets Property Ltd | Real estate | 2026 |
| Mcloughlin Leisure Limited | Hospitality | 2023 |
| MCM Inc Limited | Health & social care | 2020 |
| Mcmillan Wealth Management Ltd | Professional & scientific | 2013 |
| Mcnallyev Franchising Limited | Professional & scientific | 2021 |
| Mcnaughton Property Developments Limited | Construction | 1981 |
| Mcneil Architects Ltd | Professional & scientific | 2017 |
| Mcneil Properties Ltd | Real estate | 2025 |
| MCP Fixings Limited | Wholesale & retail | 1970 |
| Mcpherson's (U.K.) Limited | Professional & scientific | 1985 |
| Mcqueens Sheffield Ltd | Other services | 2025 |
| Mcquinn Holdings Ltd | Wholesale & retail | 2012 |
| MCR Smash Ltd | Hospitality | 2025 |
| MCR Tech Limited | Information & communication | 2016 |
| Mcrr Logistics Ltd | Transport & logistics | 2026 |
| MCS Abloads & Haulage Ltd | Transport & logistics | 2020 |
| MCS Electrical Installations Limited | Construction | 2024 |
| MCS Property Management Limited | Real estate | 2017 |
| Mcsb Ltd | Professional & scientific | 2012 |
| Mcsl Contracts Limited | Construction | 2016 |
| MD & AJ Properties Ltd | Real estate | 2026 |
| MD & T Consulting Limited | Administrative & support | 2023 |
| MD Asif Limited | Wholesale & retail | 2025 |
| MD Cosmetics Ltd | Wholesale & retail | 2026 |
| MD Enterprise Building Limited | Real estate | 2014 |
| MD Furlong Ltd | Professional & scientific | 2025 |
| MD Homes SPV Ltd | Real estate | 2023 |
| MD HOMES2 Limited | Real estate | 2025 |
| MD Law (Yorkshire) LLP | | 2017 |
| MD Pharmaceuticals Ltd | Health & social care | 2022 |
| MD PT Ltd | Education | 2025 |
| MD Risk Management Limited | Administrative & support | 2004 |
| MD Scaffolding-Uk Ltd | Construction | 2023 |
| MD Tree & Garden Services Ltd | Arts & recreation | 2016 |
| Mdallyn-Access Ltd | Construction | 2018 |
| MDB Wholesale Ltd | Wholesale & retail | 2022 |
| MDC High Peak Accountants Limited | Professional & scientific | 2013 |
| MDF Financial Limited | Professional & scientific | 2014 |
| MDF Landlord Limited | Health & social care | 2010 |
| MDF Stock Holders Limited | Wholesale & retail | 2021 |
| MDG Electrical Limited | Construction | 2021 |
| MDH Hologram Limited | Arts & recreation | 2013 |
| MDL Automotive Ltd | Wholesale & retail | 2025 |
| MDL Business Ltd | Construction | 2025 |
| Mdlm Leisure Ltd | Hospitality | 2024 |
| Mdlw Behavioural Support Limited | Health & social care | 2021 |
| MDM Building & Construction Limited | Construction | 2017 |
| MDM Scaffolding & Access Solutions Ltd | Construction | 2026 |
| MDN Mechanical Services Ltd. | Manufacturing | 2007 |
| Mdor Property Ltd | Real estate | 2023 |
| MDS Electrical Services NE Ltd | Manufacturing | 2019 |
| MDS Interiors Ltd | Construction | 2018 |
| MDS Solutions Limited | Professional & scientific | 2011 |
| MDS UK Limited | Administrative & support | 2002 |
| MDT Financial Services Limited | Financial services | 2001 |
| Mdts UK Limited | Information & communication | 2004 |
| MDW Group Ltd | Transport & logistics | 2024 |
| ME Again Hair Ltd | Other services | 2023 |
| ME Gusto Estates Ltd | Real estate | 2025 |
| ME Space Limited | Real estate | 2018 |
| ME Two AMZ Ltd | Wholesale & retail | 2025 |
| Me&U App UK Limited | Information & communication | 2020 |
| Me&U UK Trading Ltd | Information & communication | 2020 |
| Meacasa Ltd | Financial services | 2021 |
| Mead Diamond Tooling Limited | Manufacturing | 2005 |
| Meadow Bank Avenue Estate Limited | Administrative & support | 2013 |
| Meadow Barn Limited | Health & social care | 2015 |
| Meadow Farm Cattery Limited | Administrative & support | 2006 |
| Meadow M Holdings Ltd | Financial services | 2024 |
| Meadow M Properties Ltd | Real estate | 2024 |
| Meadow Media Ltd | Professional & scientific | 2022 |
| Meadowbank Coatings Limited | Construction | 2022 |
| Meadowbrook Manor Limited | Health & social care | 2017 |
| Meadowcroft (Westwood) Management Company Limited | Households | 2021 |
| Meadowcroft Health Care Limited | Health & social care | 2008 |
| Meadowgate Dynamics Limited | Professional & scientific | 2020 |
| Meadowhall (RDS) Limited | Professional & scientific | 1985 |
| Meadowhall Auto's Ltd | Wholesale & retail | 2021 |
| Meadowhall Blasting & Coatings Ltd | Manufacturing | 2023 |
| Meadowhall Motors Ltd | Wholesale & retail | 2019 |
| Meadowhall Nails Beauty Limited | Other services | 2025 |
| Meadowhall Property Limited | Real estate | 2006 |
| Meadowhall Training Limited | Education | 2002 |