| Merlin Creations Ltd | Information & communication | 2025 |
| Mersey Carpet Co.,Limited(The) | Wholesale & retail | 1954 |
| MES Electrical Contractors Limited | Construction | 2023 |
| Mesa Build Limited | Wholesale & retail | 2021 |
| Mesa Corp Ltd | Financial services | 2026 |
| Mesa Europe Ltd | Professional & scientific | 2021 |
| Mesa Group Limited | Professional & scientific | 2017 |
| Meta Home Ltd | Construction | 2021 |
| Metaldeck Limited | Wholesale & retail | 1983 |
| Metcalfes Accountancy Ltd | Professional & scientific | 2024 |
| Metfast Limited | Administrative & support | 2002 |
| Metrabadge Limited | Wholesale & retail | 1994 |
| Metzuyan Limited | Wholesale & retail | 2003 |
| Mexar Trading Limited | Extraterritorial | 2021 |
| Mexbury Investments Limited | Extraterritorial | 2021 |
| Mexon Limited | Extraterritorial | 2021 |
| Mexteck Limited | Extraterritorial | 2021 |
| Mezoo Limited | Wholesale & retail | 2025 |
| Mfyp Holdings Ltd | Real estate | 2020 |
| Mfyp Ltd | Education | 2006 |
| Mfyp Training Academy CIC | Education | 2016 |
| MG Auto-Lines Paint & Body Centre Ltd | Wholesale & retail | 2018 |
| MG Bespoke Ltd | Construction | 2024 |
| MG Decorating Services Limited | Professional & scientific | 2023 |
| MG Design + Associates Limited | Professional & scientific | 2018 |
| MGA Safety Limited | Professional & scientific | 2016 |
| MGW Golf Ltd | Education | 2020 |
| MH Bury Ltd | Hospitality | 2023 |
| MH Joinery (NW) Limited | Construction | 2025 |
| MH Lodgings Ltd | Real estate | 2024 |
| MHG Building Services Ltd | Construction | 2022 |
| MHM Products Ltd | Manufacturing | 2021 |
| MHW Financial Services Ltd | Professional & scientific | 2025 |
| MHY Speedy Ltd | Wholesale & retail | 2025 |
| MIA Menswear Limited | Wholesale & retail | 2021 |
| MIA Pharma Ltd | Health & social care | 2021 |
| Miami Pizza Bury Ltd | Hospitality | 2024 |
| Mian Tech Ltd | Wholesale & retail | 2026 |
| Michael Donn International Limited | Administrative & support | 2014 |
| Michael Properties Ltd. | Real estate | 2018 |
| Michaelsons Ltd | Real estate | 2023 |
| Micro Cement UK (NW) Ltd | Construction | 2020 |
| Microbiological Solutions Limited | Professional & scientific | 2001 |
| Microcare Systems Limited | Administrative & support | 1996 |
| Microgallery Ltd | Construction | 2019 |
| Midas Consensus Ltd | Information & communication | 2025 |
| Middle East Grill Bury Ltd | Hospitality | 2026 |
| Middleton Investments (NW) Ltd | Real estate | 2017 |
| Middleton Tattoo Studio Limited | Other services | 2000 |
| Midnight Muse Boutique Ltd | Wholesale & retail | 2025 |
| Migi Renovation Limited | Manufacturing | 2021 |
| Mihalyi & Short Installations Ltd | Construction | 2021 |
| Mihells International Limited | Transport & logistics | 2021 |
| Mikael Motors Ltd | Wholesale & retail | 2026 |
| Mike Convenience Shop Ltd | Wholesale & retail | 2025 |
| Mike Manning Consultancy & Training Ltd | Professional & scientific | 2018 |
| Miklo Fashion Ltd | Wholesale & retail | 2025 |
| Milan Sweet & Bakers Traders Limited | Wholesale & retail | 2014 |
| Milepro Ltd | Transport & logistics | 2021 |
| Miles Bakery Limited | Manufacturing | 2004 |
| Miles Car Delivery Ltd | Transport & logistics | 2023 |
| Miles Performance Private Limited | Wholesale & retail | 2016 |
| Miles Store Ltd | Wholesale & retail | 2025 |
| Milestone ERA Ltd | Wholesale & retail | 2024 |
| Militho Limited | Professional & scientific | 2020 |
| Mill House Events Limited | Hospitality | 2021 |
| Millbrooks Investments Limited | Real estate | 2022 |
| Millennium Construction Ltd | Construction | 2017 |
| Miller Agency Ltd | Professional & scientific | 2021 |
| Miller Brook (Two) Management Company Limited | Households | 2006 |
| Miller Court (Tottington) Management Company Limited | Households | 2005 |
| Miller Independent Ltd | Wholesale & retail | 2015 |
| Miller Media Services Limited | Professional & scientific | 2014 |
| Millers Vehicle Transporters Limited | Transport & logistics | 2017 |
| Millets Limited | Professional & scientific | 2012 |
| Milliners Investments Limited | Real estate | 2017 |
| Mills Container Services Ltd | Hospitality | 2018 |
| Mimesure Ltd | Information & communication | 2019 |
| MIN Pollen Property Holdings Ltd | Real estate | 2024 |
| Minden Family Practices Ltd | Health & social care | 1969 |
| Mine and Yours Ltd | Manufacturing | 2017 |
| Minha Trading & Sourcing Ltd | Wholesale & retail | 2023 |
| Minhas Capital Ltd | Professional & scientific | 2026 |
| Minhas Construction Limited | Construction | 2007 |
| Minhas Markets Ltd | Financial services | 2026 |
| Mini Diggers NW Limited | Administrative & support | 2025 |
| Miniwardrobe Limited | Wholesale & retail | 2025 |
| Minner Housing Limited | Real estate | 2023 |
| Minni Ltd | Wholesale & retail | 2023 |
| Minnie B Limited | Construction | 2017 |
| Minta Imports and Transport Services Ltd | Wholesale & retail | 2020 |
| Mintech Spares UK Limited | Wholesale & retail | 2008 |
| Mintenance Ltd | Information & communication | 2025 |
| Mintevour Ltd | Information & communication | 2026 |
| MIR Ventures Limited | Real estate | 2024 |
| Mirador General Trading Limited | Arts & recreation | 2022 |
| Mirage Hair and Beauty Limited | Administrative & support | 2020 |
| Mirza Maaz Limited | Administrative & support | 2025 |
| MIS Raices Ltd | Wholesale & retail | 2025 |
| Misbratics Ltd | Wholesale & retail | 2018 |