| Milk Pension Fund Trustees Limited | Financial services | 1961 |
| Milkstone Limited | Financial services | 2008 |
| Milky Takeaway Limited | Hospitality | 2026 |
| Millar Limited | Wholesale & retail | 2023 |
| Millbank Edge LLP | | 2009 |
| Millers Retail Design Holdings Limited | Manufacturing | 2014 |
| Millers Retail Design Limited | Manufacturing | 1956 |
| Milliano Ltd | Wholesale & retail | 2026 |
| Millinova Ltd | Wholesale & retail | 2023 |
| Millmore Limited | Professional & scientific | 2011 |
| Millord Limited | Information & communication | 2025 |
| Mills Property Developments Limited | Real estate | 2025 |
| Milly Rose Ltd | Wholesale & retail | 2015 |
| MILOW10 Limited | Information & communication | 2018 |
| Milprocompany Ltd | Households | 2025 |
| Milton Court Salford Limited | Real estate | 1970 |
| Miluhome Ltd | Wholesale & retail | 2025 |
| Mince Club Limited | Arts & recreation | 2025 |
| Mindful Acting Limited | Arts & recreation | 2025 |
| Mindful Making CIC | Education | 2026 |
| Mindspark Tutors Ltd | Education | 2026 |
| Mingzun UK Ltd | Wholesale & retail | 2025 |
| Mini Footwear Ltd | Wholesale & retail | 2024 |
| MINING4U Limited | Other services | 2021 |
| Minka Youth Foundation CIC | Education | 2017 |
| Minstrell Permanent Recruitment Limited | Administrative & support | 2022 |
| Minstrell Recruitment (M&E) Limited | Administrative & support | 2014 |
| Minstrell Recruitment Services Ltd | Administrative & support | 2007 |
| Mintra Thai Massage Limited | Health & social care | 2018 |
| Mintz Estates Limited | Real estate | 2015 |
| Minyan Govoa CIC | Other services | 2025 |
| Miracle Garden Care Pension Trustee Limited | Professional & scientific | 2018 |
| Mirage Window Blinds UK Ltd | Manufacturing | 2019 |
| Miralitevent $ V12 Ocean Ltd | Other services | 2024 |
| Miriraf Ltd | Real estate | 2020 |
| Mirra Food Ltd | Hospitality | 2023 |
| Misaskim Manchester Ltd | Other services | 2013 |
| Misgana Pljc Limited | Professional & scientific | 2021 |
| Mishri Atelier Ltd | Manufacturing | 2025 |
| Misi Limited | Financial services | 2016 |
| Misrad Estates Limited | Other services | 2021 |
| Misrad Holdings Limited | Other services | 2021 |
| Missing List Ltd | Wholesale & retail | 2025 |
| Mistcharter Ltd | Arts & recreation | 2023 |
| Mistoria Estate Agents Bolton Ltd | Real estate | 2014 |
| Mistoria Estate Agents Liverpool Ltd | Other services | 2005 |
| Mistoria House Share Ltd | Real estate | 2012 |
| Mistoria Investments Ltd. | Real estate | 2009 |
| Mistoria Renovations Ltd | Construction | 2011 |
| Mistoria SPV 5 Limited | Real estate | 2010 |
| MIU Labs Ltd | Information & communication | 2025 |
| MIX Culture Local Ltd | Wholesale & retail | 2020 |
| MIX Media Limited | Information & communication | 1999 |
| MIX Media Trustee Limited | Professional & scientific | 2022 |
| Mixkat Limited | Information & communication | 2015 |
| MJA Planning Limited | Professional & scientific | 2011 |
| Mjayinnovate Limited | Information & communication | 2025 |
| MJC Legal Ltd | Professional & scientific | 2025 |
| MJF Real Estate Limited | Real estate | 2024 |
| MJH Legal Services Ltd | Professional & scientific | 2022 |
| MJW Processing Ltd | Wholesale & retail | 2020 |
| MK Estates Ltd | Wholesale & retail | 2018 |
| MK Homestead Ltd | Real estate | 2024 |
| Mk-Lettings Ltd | Administrative & support | 2010 |
| Mk-Service&Maintenance Ltd | Construction | 2025 |
| Mkal Property Ltd | Construction | 2024 |
| MKJ Property Ltd | Real estate | 2024 |
| MKM Star Ltd | Hospitality | 2023 |
| MKV Care Ltd | Health & social care | 2013 |
| MLD Exporters Ltd | Wholesale & retail | 2026 |
| MM Group MCR Ltd | Construction | 2024 |
| MM Procurement Limited | Administrative & support | 2024 |
| Mm&R Investment Ltd | Real estate | 2017 |
| Mm-Drop Limited | Wholesale & retail | 2022 |
| MMB Traders MCR Limited | Wholesale & retail | 2025 |
| MMC Advisory Services Ltd | Professional & scientific | 2022 |
| MME Travel Services Ltd | Transport & logistics | 2026 |
| MMG Builders Ltd | Construction | 2022 |
| MMG North Ltd | Real estate | 2017 |
| MMG Sheff Ltd | Construction | 2025 |
| MMG UK Marketing Company Limited | Other services | 2025 |
| Mmgg Acquisition Limited | Administrative & support | 2012 |
| Mmgg Properties Limited | Real estate | 2014 |
| MMR Construction Bradford Ltd | Construction | 2013 |
| MMR Homes Ltd | Real estate | 2019 |
| MMS Services and Estates Limited | Manufacturing | 2016 |
| MMW Estates Ltd | Real estate | 2026 |
| MNI Imports Ltd | Manufacturing | 2024 |
| MOB Estates Ltd | Real estate | 2026 |
| Moba Properties Ltd | Real estate | 2021 |
| Mobberley Farm Limited | Professional & scientific | 2011 |
| Mobile Car CPR Limited | Wholesale & retail | 2023 |
| Mobile Distribution Ltd | Wholesale & retail | 2025 |
| Mobile Homes for Export Ltd. | Wholesale & retail | 2017 |
| Mobile Monday Manchester Ltd | Information & communication | 2011 |
| Mobile Trading Ltd | Wholesale & retail | 2025 |
| Mobilefreshcut Ltd | Other services | 2025 |
| Mobilezone Salford Limited | Wholesale & retail | 2024 |
| Mobin Building Ltd | Construction | 2023 |
| Mochi Market Ltd | Wholesale & retail | 2025 |