| Lymphoedema Training Academy Ltd. | Education | 2013 |
| Lymphvision Limited | Health & social care | 2017 |
| Lyne Hill Contracts Limited | Construction | 2025 |
| Lyne Hill Hideaway Ltd | Hospitality | 2023 |
| Lynica Limited | Wholesale & retail | 2006 |
| Lynne.A.Dean Limited | Education | 2014 |
| Lyons Groundworks Limited | Construction | 2023 |
| M & D Adams (Kingswinford) Ltd | Hospitality | 2019 |
| M & E Oral Healthcare Ltd | Health & social care | 2017 |
| M & F Catering and Gurkha Groceries Limited | Hospitality | 2012 |
| M & G Holdings Stafford Limited | Financial services | 2025 |
| M & H Services (Stafford) Limited | Real estate | 1992 |
| M & L Dairying Limited | Agriculture & fishing | 2013 |
| M & L Property Services Limited | Administrative & support | 2023 |
| M & M Legal Limited | Professional & scientific | 2020 |
| M & P Testing Limited | Wholesale & retail | 2001 |
| M Atkin Landscapes Ltd | Administrative & support | 2021 |
| M B Spellman and Co Ltd | Wholesale & retail | 2023 |
| M Bissell Trees and Hedges Ltd | Administrative & support | 2014 |
| M Carter Plumbing Services Limited | Construction | 2009 |
| M D Clad Ltd | Construction | 2018 |
| M D Pope Ltd | Public administration | 2022 |
| M H Reynolds Combustion & Control Ltd | Administrative & support | 2021 |
| M Hall Removals Limited | Transport & logistics | 2022 |
| M M (Midlands) Limited | Construction | 2020 |
| M Madders Investments Ltd | Real estate | 2022 |
| M Wright Fencing Contractors Ltd | Construction | 2025 |
| M&G Star Limited | Wholesale & retail | 2024 |
| M&I Medical Ltd | Health & social care | 2016 |
| M&K Mottershead Limited | Wholesale & retail | 2007 |
| M. & F. Leisure (Penkridge) Limited | Real estate | 1989 |
| M. Cheks Building Consultancy Ltd | Professional & scientific | 2024 |
| M. Cheks Properties Ltd | Real estate | 2018 |
| M.J. Perrins Limited | Construction | 2002 |
| M.L PUB Co Ltd | Hospitality | 2018 |
| M.P. Bell Consultancy Limited | Information & communication | 2005 |
| M.W. Cripwell (Properties) Limited | Real estate | 1982 |
| MA Info Systems Ltd | Wholesale & retail | 2019 |
| MAA Sovereign Ltd | Professional & scientific | 2026 |
| Maamoun Limited | Health & social care | 2023 |
| Mabalur Limited | Wholesale & retail | 2024 |
| MAC Interior Project Management Limited | Professional & scientific | 2018 |
| MAC Rail Limited | Professional & scientific | 2011 |
| Mach 5 Consulting Ltd | Professional & scientific | 2024 |
| Mach Logistics Ltd | Transport & logistics | 2024 |
| Mack Bars Ltd | Hospitality | 2025 |
| Mack&Marsh Properties Ltd | Real estate | 2024 |
| Mackaholdings Ltd | Wholesale & retail | 2024 |
| Macopus Music Limited | Education | 2024 |
| Macro-Ge Industrial Limited | Wholesale & retail | 2025 |
| Macs Aligned Studios Limited | Wholesale & retail | 2022 |
| MAD Merchandise Limited | Administrative & support | 2005 |
| Madaileyg Limited | Wholesale & retail | 2025 |
| Made in Envy Clothing Ltd | Wholesale & retail | 2024 |
| Made in Staffordshire Ltd | Wholesale & retail | 2025 |
| Made International Co., Ltd. | Wholesale & retail | 2025 |
| Madfrog Ltd | Wholesale & retail | 2021 |
| Madhar Holdings Limited | Financial services | 2023 |
| Madlan Electrical Contractors Ltd | Construction | 2019 |
| MAG Developments Limited | Construction | 2014 |
| MAG DWF Ltd | Construction | 2020 |
| MAG Homes Group Ltd | Construction | 2020 |
| MAG Process Engineering Limited | Professional & scientific | 2016 |
| Magg Fire Services Limited | Construction | 2012 |
| Magic by Candlelight (Stafford) Limited | Wholesale & retail | 2011 |
| Magic Scissors Barber Ltd | Other services | 2023 |
| Magic Scissors Barber Shop Ltd | Other services | 2024 |
| Magodora Incorporation Limited | Manufacturing | 2022 |
| Magpie Computer Developments Ltd | Information & communication | 1984 |
| Mahn Properties (Adams) Ltd | Real estate | 2024 |
| Mahn Properties Limited | Real estate | 2020 |
| Main Associates Limited | Professional & scientific | 2015 |
| Make 'N' Doodle DO Ltd | Arts & recreation | 2022 |
| Make Life Easier Limited | Wholesale & retail | 2020 |
| Make Some Noise Ltd | Education | 2008 |
| Maker.Ai Limited | Information & communication | 2023 |
| Makesense CBT Ltd | Administrative & support | 2020 |
| Mako Pet Supplies Ltd | Manufacturing | 2024 |
| Makse Electrical Limited | Construction | 2023 |
| Malaiye Trading Company Ltd | Wholesale & retail | 2025 |
| Malek Hussein Trading Company Ltd | Wholesale & retail | 2025 |
| Malibu Hot Tubs Limited | Wholesale & retail | 2009 |
| Malkot Investments Limited | Real estate | 2021 |
| Mallard Studios Limited | Information & communication | 2004 |
| Mallard Walk Management Company Limited | Households | 2016 |
| Malthouse Associates Ltd | Real estate | 2002 |
| Mama Africa Groceries Ltd | Wholesale & retail | 2025 |
| Mama's Perfect Prints Ltd | Manufacturing | 2025 |
| Mamanka Restaurant Limited | Hospitality | 2025 |
| MAN Co Brook View Limited | Real estate | 2021 |
| Mandarin House Chinese Takeaway Limited | Hospitality | 2021 |
| Mandarin Walk Farm Limited | Wholesale & retail | 2021 |
| Manforda Ltd | Manufacturing | 2021 |
| Mango Technology Consulting Limited | Information & communication | 2024 |
| Manley Cuisine Limited | Hospitality | 2023 |
| Manley Gold Holdings Limited | Professional & scientific | 2003 |
| Manley House Limited | Hospitality | 2001 |
| Manley Properties Holdings Limited | Financial services | 2026 |
| Manley Properties Limited | Real estate | 2000 |
| Manor Electrical Holdings Limited | Financial services | 2017 |