| Manzar Hussain Khan Limited | Transport & logistics | 2012 |
| MAR Barca Ltd | Hospitality | 2017 |
| Maria B Evans Property Management Ltd | Real estate | 2003 |
| Maria Searle Ltd | Health & social care | 2024 |
| Marinus Equestrian Limited | Wholesale & retail | 2025 |
| Mark Pass Holdings Ltd | Real estate | 2023 |
| Marked 4 Life Ltd | Arts & recreation | 2023 |
| Marron & Sons Properties Limited | Real estate | 2025 |
| Marsh Electrical NW Limited | Construction | 2022 |
| Marshallkaila Ltd | Health & social care | 2022 |
| Martin Gifford GAS Services Limited | Construction | 2008 |
| Martins Silins Limited | Arts & recreation | 2025 |
| Master of Coin Ltd | Professional & scientific | 2016 |
| Mateus Fijalkowski Ltd | Arts & recreation | 2025 |
| Matoli's Pizza Co. Limited | Hospitality | 2026 |
| Matthews & Leigh Civil Engineering Limited | Construction | 1998 |
| Matthews & Leigh Holdings Ltd | Professional & scientific | 2020 |
| MAVERICK2025 Ltd | Hospitality | 2025 |
| Maxine Ball Limited | Hospitality | 2020 |
| Mayoral Bathrooms Ltd | Wholesale & retail | 2017 |
| Maypoint North West Limited | Information & communication | 2014 |
| Maysco Ltd | Extraterritorial | 2024 |
| MB Joinery & Roofing Ltd | Construction | 2015 |
| MBA Healthcare Limited | Wholesale & retail | 2010 |
| MBE Properties (NW) Ltd | Real estate | 2019 |
| MBP Construction (NW) Limited | Construction | 2021 |
| Mccartney Valeting & Detailing Ltd | Administrative & support | 2019 |
| Mcdonough Enterprises Ltd | Other services | 2025 |
| Mchugh Estates Limited | Real estate | 2025 |
| Mcintyre Trading Ltd | Information & communication | 2020 |
| Mcltvc Properties Limited | Real estate | 2026 |
| Mcnally Power Ltd | Construction | 2025 |
| MDJ Property Development Ltd | Real estate | 2025 |
| MDW Valves Limited | Administrative & support | 2007 |
| Mech-Works Ltd | Professional & scientific | 2023 |
| Mechanic NOW (JPH) Limited | Professional & scientific | 2025 |
| Mechanical Engineering Project Solutions Ltd | Professional & scientific | 2025 |
| Media Town Ltd | Information & communication | 2012 |
| Meganspubs Ltd | Hospitality | 2025 |
| Melissa Yasmin Design Limited | Wholesale & retail | 2015 |
| Mellor Road (Leyland) Management Company Limited | Real estate | 2007 |
| Menrgy Limited | Administrative & support | 2025 |
| Mensah & Marsh Properties Ltd | Real estate | 2020 |
| Mercury Recycling Limited | Water & waste | 1994 |
| Merf Properties Limited | Real estate | 2023 |
| MEW Services Limited | Other services | 2023 |
| Mezztech Limited | Financial services | 2015 |
| MFI Limited | Wholesale & retail | 2020 |
| MGC Import Export Consultants Ltd. | Transport & logistics | 2008 |
| MGL (NW) Limited | Real estate | 2019 |
| MGT Estates Ltd | Real estate | 2024 |
| Miami Chicken & Pizza Leyland Ltd | Hospitality | 2021 |
| MIB Signalling Testing Compliance Limited | Construction | 2018 |
| Michael & Margaret Limited | Real estate | 2011 |
| Middleton West Ltd | Wholesale & retail | 2025 |
| Midl Limited | Wholesale & retail | 2025 |
| Midlee Limited | Professional & scientific | 2023 |
| Miele Italia Limited | Hospitality | 2018 |
| Mikhael Owen Ltd | Transport & logistics | 2026 |
| Milagro Cosmetics UK Ltd | Manufacturing | 2024 |
| Milease UK Ltd | Administrative & support | 2020 |
| Milspec Solutions Ltd | Wholesale & retail | 2010 |
| Miltech Integrated Solutions Ltd | Administrative & support | 2019 |
| Minearch Limited | Extraterritorial | 1985 |
| Miss Derriere Ltd | Manufacturing | 2015 |
| Missionre Ltd | Administrative & support | 2023 |
| Misty Window Fixer Limited | Administrative & support | 2019 |
| MJB Surveyors Ltd | Professional & scientific | 2023 |
| Mjdnet Limited | Information & communication | 2012 |
| Mjqr Ltd | Professional & scientific | 2022 |
| MK Day Consulting Ltd | Professional & scientific | 2025 |
| MK Systems Engineering Limited | Professional & scientific | 2023 |
| MKS Automotive Consultants Limited | Wholesale & retail | 2014 |
| ML Business Services Limited | Professional & scientific | 2023 |
| MLB Graphics Ltd | Professional & scientific | 2024 |
| Mnhl Properties Ltd | Real estate | 2024 |
| Modern Comfort Ltd. | Manufacturing | 2023 |
| MOG Property Ltd | Real estate | 2025 |
| Mols Aesthetics Ltd | Other services | 2021 |
| Money Made Simple Limited | Financial services | 2013 |
| Moonatlas Ltd | Wholesale & retail | 2025 |
| Moonendale Group Limited | Administrative & support | 2016 |
| Moor Park Preston Ltd | Hospitality | 2024 |
| Mopdev Limited | Construction | 2023 |
| Morgan & Crawley (Properties) Ltd | Real estate | 2025 |
| Morgan & Crawley Limited | Administrative & support | 2019 |
| Mortimers Fuels Commercial Ltd | Wholesale & retail | 2024 |
| Mortimers Fuels Ltd | Wholesale & retail | 2023 |
| Motor Finance Solutions Limited | Financial services | 2006 |
| Motordrive Limited | Manufacturing | 2014 |
| Motordrive Seats Limited | Manufacturing | 2014 |
| Moverank Limited | Professional & scientific | 1999 |
| MPT Automotive Logistics Ltd | Transport & logistics | 2021 |
| MPT Couriers Limited | Administrative & support | 2021 |
| MR Barton Maths Limited | Education | 2018 |
| MR Derriere Ltd | Manufacturing | 2015 |
| Mrmn Ltd | Wholesale & retail | 2025 |
| MRS Peach Parties Limited | Arts & recreation | 2022 |
| Msbd Reddy Ltd | Hospitality | 2025 |
| Mscm Transport Ltd | Wholesale & retail | 2025 |