| MH Properties (Scotland) Ltd | Real estate | 2024 |
| MH WWS Limited | Professional & scientific | 2017 |
| MHA Horizon Ltd | Transport & logistics | 2025 |
| Mharsanta Ltd | Hospitality | 2019 |
| MHC Leisure Ltd | Arts & recreation | 2019 |
| Mhor Environmental Ltd | Professional & scientific | 2019 |
| MIC Hair Ltd | Other services | 2015 |
| Michael Brooks Coaching Ltd | Administrative & support | 2021 |
| Michael Brooks Golf Ltd | Administrative & support | 2021 |
| Microverge Media Ltd | Wholesale & retail | 2017 |
| Midland Steel Reinforcement Supplies (UK) Limited | Manufacturing | 2008 |
| Midnight Cravings (Scotland) Limited | Hospitality | 2025 |
| Migos a Limited | Energy | 2015 |
| Miller Landscaping Ltd | Administrative & support | 2023 |
| Milton Engineering (Scotland) Limited | Administrative & support | 2011 |
| Milton Mini Market Ltd | Wholesale & retail | 2025 |
| Mind & Body Management Ltd. | Health & social care | 2001 |
| Minster & Mcfarlane Hair Ltd | Other services | 2022 |
| Mint Eyewear Ltd. | Wholesale & retail | 2009 |
| Miss GB Edinburgh Ltd | Professional & scientific | 2023 |
| Missd (Scotland) Ltd | Hospitality | 2022 |
| Mitchell Drainage and Waste Services Limited | Administrative & support | 1998 |
| Mitchell Drainage Services Limited | Administrative & support | 2008 |
| Mitchell Surveying Services Limited | Professional & scientific | 2022 |
| Mitchell's Drainline Limited | Administrative & support | 2005 |
| Mitm Holdings Ltd | Hospitality | 2023 |
| Mitzutrans Ltd | Transport & logistics | 2025 |
| MIX Pickle Ltd | Hospitality | 2025 |
| MK Catering Ltd | Hospitality | 2019 |
| MK Courier Services Limited | Transport & logistics | 2024 |
| MK Rail Limited | Construction | 2026 |
| MK74 Investment Park Ltd | Transport & logistics | 2020 |
| MKA Commercial Limited | Wholesale & retail | 2006 |
| ML1 Foods Limited | Hospitality | 2019 |
| ML1 Invest Ltd | Real estate | 2018 |
| ML1 Ltd | Real estate | 2017 |
| MLD17 Limited | Professional & scientific | 2020 |
| MLO Assets Limited | Professional & scientific | 2019 |
| MLX Trades Ltd | Wholesale & retail | 2025 |
| Mmash Ltd | Wholesale & retail | 2025 |
| Mmes Limited | Professional & scientific | 2009 |
| MMJ Pharmaceuticals Ltd | Wholesale & retail | 2022 |
| Mmtc Joinery Limited | Construction | 2023 |
| Mndc Properties Limited | Real estate | 2025 |
| MNE Catering Ltd | Hospitality | 2023 |
| Mobeen Motherwell Ltd | Hospitality | 2022 |
| Mobile Master Shop Ltd | Wholesale & retail | 2024 |
| MOD Joinery Ltd | Construction | 2024 |
| Moda Properties Ltd | Real estate | 2013 |
| Modern Assets Motherwell Limited | Construction | 2021 |
| Modern Factoring & Maintenance Limited | Construction | 2022 |
| Modern Holdings Wishaw Limited | Construction | 2021 |
| Modern Homes Solutions Ltd. | Construction | 2004 |
| Modern Plant Motherwell Limited | Construction | 2021 |
| Moderno BKB Ltd | Administrative & support | 2004 |
| Modulus Homes Ltd | Construction | 2017 |
| Modus Space Ltd | Real estate | 2022 |
| Modyrvale QA Consultancy Ltd | Professional & scientific | 2025 |
| Moja (Scotland) Ltd | Real estate | 2026 |
| Molendinar Property Ltd | Real estate | 2015 |
| Molson Scotland Limited | Wholesale & retail | 1978 |
| Mona Liza Boutique Limited | Wholesale & retail | 2017 |
| Monaghan Group Ltd | Financial services | 2026 |
| Money Talks Cars Ltd | Wholesale & retail | 2017 |
| Monicraft Ltd | Manufacturing | 2018 |
| Mooney Engineering Consultants Ltd | Professional & scientific | 2012 |
| Moore Macdonald Ltd | Professional & scientific | 2024 |
| Moorhead & Mcgavin Limited | Manufacturing | 1923 |
| Morebarakah Ltd | Wholesale & retail | 2026 |
| Moregrow Ltd | Wholesale & retail | 2026 |
| Morgan Electrical and Sons Ltd | Construction | 2021 |
| Morganmcc Rail Limited | Construction | 2016 |
| Morpharm Ltd | Professional & scientific | 2024 |
| Morrison Facilities Services Limited | Construction | 1989 |
| Mortgage Line(National) Ltd | Financial services | 2015 |
| Mossend Autos Ltd | Wholesale & retail | 2015 |
| Motherwell & District Women's AID | Administrative & support | 2005 |
| Motherwell and Wishaw Citizens Advice Bureau | Information & communication | 1997 |
| Motherwell Barbers Ltd | Other services | 2025 |
| Motherwell Cuisine Ltd | Hospitality | 2024 |
| Motherwell Football and Athletic Club Limited (the) | Arts & recreation | 1904 |
| Motherwell Football Club Community Trust | Arts & recreation | 2011 |
| Motherwell Fork Trucks Limited | Administrative & support | 2005 |
| Motherwell Fuel Services Ltd | Wholesale & retail | 2019 |
| Motherwell Garage Services Limited | Wholesale & retail | 2025 |
| Motherwell Taverns Limited | Hospitality | 2018 |
| Motola Limited | Administrative & support | 2016 |
| Mountain View Foods Limited | Hospitality | 2014 |
| Move Group Ltd | Administrative & support | 2023 |
| Move on Homes Scotland Ltd | Real estate | 2021 |
| Moveit.Da Ltd | Education | 2026 |
| Mozza Group Ltd | Hospitality | 2017 |
| MP1928 Ltd | Construction | 2017 |
| Mpmh Construction Limited | Construction | 2004 |
| MPT Electrical & Mechanical Engineering Ltd | Construction | 2022 |
| MR MART24 Ltd | Wholesale & retail | 2025 |
| MRL Contracts Ltd | Real estate | 2022 |
| MRM Smart Solutions Limited | Information & communication | 2024 |
| Mrs-Fit Food Intolerance Testing Ltd | Health & social care | 2023 |
| MS Fitness Centre Limited | Arts & recreation | 2025 |