| Mckenzie Philips Accountants (2018) Limited | Administrative & support | 2018 |
| Mckenzie Philips Accountants Limited | Professional & scientific | 2012 |
| Mckenzie Property Developments (NW) Ltd | Real estate | 2020 |
| Mckeown Roofing and Demolition Limited | Construction | 2025 |
| Mckernan Couriers Limited | Transport & logistics | 2025 |
| Mckie Property Limited | Real estate | 2021 |
| Mckie's Fishing Charters Ltd | Administrative & support | 2014 |
| Mckinney Road Haulage Ltd | Transport & logistics | 2025 |
| Mckuhens Catering Limited | Hospitality | 2015 |
| Mckuhens of Liverpool Limited | Wholesale & retail | 1995 |
| MCL Railway Construction Limited | Construction | 2024 |
| Mclaren Owners Club UK Ltd | Administrative & support | 2023 |
| Mclaren Watson Legal Ltd | Professional & scientific | 2024 |
| Mclaughlin Investment and Properties Ltd | Real estate | 2024 |
| Mcleod & Mcleod Holdings Ltd | Wholesale & retail | 2019 |
| Mcleod's Developments Ltd | Construction | 2022 |
| Mcloud Building Projects Ltd | Construction | 2025 |
| Mcloughlin Wood Property Holding Ltd | Real estate | 2022 |
| MCM Developments (NW) Ltd | Construction | 2023 |
| MCM Energy Ltd | Energy | 2022 |
| MCM Properties Ltd | Real estate | 2020 |
| Mcmindmentor Ltd | Health & social care | 2025 |
| Mcmullen Design Services Limited | Professional & scientific | 2018 |
| Mcnally & Sons Roofing Limited | Construction | 2025 |
| Mcnally Future Ventures Limited | Administrative & support | 2024 |
| Mcnamaras Sports Bar and Lounge Ltd | Hospitality | 2024 |
| Mcneill Property Investments Ltd | Real estate | 2025 |
| Mcnova Ltd | Wholesale & retail | 2025 |
| Mcore Electrical Services Ltd | Construction | 2017 |
| MCP Classics Ltd | Wholesale & retail | 2022 |
| MCP Electrical Ltd | Construction | 2020 |
| Mcparland Prescribing Services Ltd | Health & social care | 2017 |
| Mcpartland & Gifford Limited | Real estate | 2016 |
| Mcphillips Roofing Systems Limited | Construction | 2015 |
| Mcpw Consultancy Limited | Administrative & support | 2026 |
| Mcqn Limited | Manufacturing | 2005 |
| Mcquaidpropertymaintenance Limited | Construction | 2021 |
| Mcqueen Republic Limited | Public administration | 2015 |
| MCR Digital Limited | Professional & scientific | 2023 |
| Mcrobinson Property Ltd | Other services | 2017 |
| MCS & CHO Ltd | Health & social care | 2025 |
| MCS Incorporated Limited | Information & communication | 2025 |
| MCS Irish Ltd | Hospitality | 2025 |
| MCS Real Estate Services Limited | Administrative & support | 2024 |
| Mcsalis Limited | Information & communication | 2024 |
| MCU Cleaning Service Ltd | Administrative & support | 2022 |
| MCV Telecom Ltd | Information & communication | 2025 |
| MCW Consultancy Ltd | Professional & scientific | 2022 |
| Mcwhite Limited | Real estate | 2021 |
| Mcwill Properties Ltd | Real estate | 2026 |
| MD Activewear Limited | Wholesale & retail | 2024 |
| MD Business Supplies Ltd | Wholesale & retail | 2015 |
| MD Chip Limited | Wholesale & retail | 2019 |
| MD Estates (NW) Ltd | Real estate | 2024 |
| MD Fire and Property Ltd | Construction | 2024 |
| MD FM Consulting Ltd | Professional & scientific | 2022 |
| MD Management Services Limited | Professional & scientific | 2017 |
| MD Mini Market Ltd | Wholesale & retail | 2023 |
| MD Natural Hair & Beauty Ltd | Other services | 2023 |
| MD Pallet Recycling Services Ltd | Manufacturing | 2022 |
| MD Prestige Ltd | Wholesale & retail | 2022 |
| MD Price Ltd | Information & communication | 2010 |
| MD Productions Training Academy Limited | Arts & recreation | 2013 |
| MD Properties Management Ltd | Construction | 2024 |
| MD Property Developments (North West) Limited | Real estate | 2016 |
| MD Surfacing Ltd | Construction | 2024 |
| MD Talent Management Ltd | Other services | 2018 |
| MDA Business Advisory Limited | Professional & scientific | 2026 |
| MDA Property Management Ltd | Other services | 2020 |
| MDC (Contracting) Limited | Administrative & support | 2017 |
| MDC Associates Limited | Financial services | 2001 |
| MDC Fire Doors Limited | Public administration | 2023 |
| MDC Painters (Liverpool) Ltd | Construction | 2020 |
| MDC Plumbing & GAS Services Ltd | Construction | 2021 |
| MDD Group Ltd | Real estate | 2022 |
| MDE Properties Ltd | Real estate | 2020 |
| MDE Restaurant Limited | Hospitality | 2020 |
| Mdelargy Consultancy Ltd | Professional & scientific | 2024 |
| MDG Estates Limited | Transport & logistics | 2016 |
| Mdgc Ltd | Other services | 2022 |
| MDH Accommodation Ltd | Hospitality | 2019 |
| MDH Construct Limited | Construction | 2019 |
| MDH Maintenance Services Ltd | Construction | 2023 |
| Mdhc Container Services Limited | Administrative & support | 2019 |
| Mdkd 1996 Ltd | Health & social care | 2019 |
| MDL Construction Group Ltd | Construction | 2023 |
| MDL Fabric Ltd | Construction | 2022 |
| MDL Group Holdings Ltd | Financial services | 2023 |
| MDL NW Ltd | Financial services | 2023 |
| MDL Salford Limited | Construction | 2022 |
| MDM Automotive Services Ltd | Wholesale & retail | 2014 |
| MDM Trans Ltd | Wholesale & retail | 2011 |
| MDM3 Limited | Information & communication | 2016 |
| Mdomo Ltd | Wholesale & retail | 2025 |
| MDR Cooling Ltd | Construction | 2024 |
| MDR Interiors Group Limited | Financial services | 2023 |
| MDR Interiors Limited | Construction | 2003 |
| MDR Joinery Limited | Manufacturing | 2022 |
| MDR Property Investment Ltd | Real estate | 2015 |
| MDS Installations Limited | Construction | 2016 |