| M a Siddiq Limited | Health & social care | 2013 |
| M and J Transport Services (2020) Limited | Transport & logistics | 2020 |
| M B Event Organiser Limited | Hospitality | 2019 |
| M Bhuta Ltd | Financial services | 2026 |
| M D M Roofing Services Limited | Construction | 2021 |
| M Daily Bromyard Ltd | Wholesale & retail | 2025 |
| M G Mania Limited | Wholesale & retail | 2006 |
| M G Transport Solutions Ltd | Transport & logistics | 2020 |
| M Heaton Property Renovations Ltd | Real estate | 2025 |
| M J Afro Caribbean Food Stuffs Ltd | Wholesale & retail | 2024 |
| M J Wigley Services & Investments Limited | Professional & scientific | 2025 |
| M Jury Engineering Ltd | Professional & scientific | 2015 |
| M K Building Services (West Midlands) Ltd | Construction | 2019 |
| M Kalirai Investments Ltd | Real estate | 2022 |
| M L Evans Plastering Services Limited | Construction | 2005 |
| M M a Consultants Ltd | Households | 2021 |
| M O C Hire Ltd | Other services | 2019 |
| M P 1992 Holdings Ltd | Financial services | 2025 |
| M Reilly (Midlands) Limited | Other services | 2006 |
| M S B Carpets Limited | Wholesale & retail | 2025 |
| M S C Leisure Limited | Hospitality | 2012 |
| M S Sandhu Construction Limited | Administrative & support | 2025 |
| M Singh Projects Limited | Professional & scientific | 2017 |
| M Smith Holdings Ltd | Financial services | 2025 |
| M T Morris Limited | Construction | 2014 |
| M Textiles Ltd | Wholesale & retail | 2025 |
| M Vaults Limited | Hospitality | 2018 |
| M W Property Developments (Midlands) Ltd | Construction | 2018 |
| M Zayan Transport Ltd | Administrative & support | 2025 |
| M&A Kitchen & Joinery Ltd | Construction | 2026 |
| M&D Coach Works Ltd | Professional & scientific | 2023 |
| M&D Grab Hire Ltd | Transport & logistics | 2023 |
| M&F Facilities and Management Ltd | Wholesale & retail | 2021 |
| M&G Barber Ltd | Other services | 2026 |
| M&H Carpet and Flooring Ltd | Wholesale & retail | 2021 |
| M&I Domestic Appliances (Aldridge) Limited | Other services | 2010 |
| M&J & SON Ltd | Wholesale & retail | 2024 |
| M&J Bodyworx Ltd | Wholesale & retail | 2026 |
| M&K Care Solutions Ltd | Health & social care | 2014 |
| M&K Foods Ltd | Hospitality | 2025 |
| M&M Mendel Limited | Transport & logistics | 2021 |
| M&S Aggregates Ltd | Transport & logistics | 2025 |
| M&S Delivery Ltd | Transport & logistics | 2019 |
| M&S Prokop Transport Ltd | Transport & logistics | 2019 |
| M&T Tyre Services Ltd | Wholesale & retail | 2025 |
| M. a. Cable Services Limited | Construction | 2006 |
| M. a. Training Enterprise Limited | Health & social care | 2009 |
| M. Bolas Transport Ltd | Transport & logistics | 2016 |
| M. Fiaz & Sons Limited | Wholesale & retail | 2012 |
| M. Greenaway & SON Limited | Manufacturing | 1976 |
| M.A.Clay Contracting Limited | Transport & logistics | 1999 |
| M.A.D. Installations Limited | Manufacturing | 2005 |
| M.D Electrical Installations Ltd | Construction | 2023 |
| M.D. Installations (West Midlands) Limited | Construction | 2002 |
| M.H. Installations Ltd. | Manufacturing | 1999 |
| M.I Building & Carpentry Ltd | Construction | 2021 |
| M.I.P. Limited | Construction | 2008 |
| M.K.G. Holdings Limited | Wholesale & retail | 1967 |
| M.K.G.(Food Products)Limited | Wholesale & retail | 1950 |
| M.Kpro Solution Ltd | Financial services | 2018 |
| M.L. Safety Limited | Professional & scientific | 2005 |
| M.M.R Consultancy Limited | Professional & scientific | 2024 |
| M.P.T. Auto's Ltd | Wholesale & retail | 2017 |
| M.R.E Training Limited | Administrative & support | 2007 |
| M.S. Boparai Properties Limited | Real estate | 2017 |
| M.S. Hunt Shopfitting, Building & Exhibitions Services Limited | Other services | 2016 |
| M.S.G. Security Limited | Administrative & support | 1993 |
| M.T. Mechanical Handling Limited | Manufacturing | 2009 |
| M.U.A Family Ltd | Hospitality | 2025 |
| M.V.- Meccanica Verghera Limited | Manufacturing | 1990 |
| M.Y Project Management Ltd | Information & communication | 2017 |
| M4 Developments Ltd | Construction | 2022 |
| M5 Spice Limited | Wholesale & retail | 2025 |
| M6 Group of Companies Limited | Professional & scientific | 2015 |
| M6 Investments Limited | Real estate | 2013 |
| M633 Group UK Ltd | Wholesale & retail | 2024 |
| M70 ACH Limited | Administrative & support | 2013 |
| MA & AA Property Services Ltd | Real estate | 2024 |
| MA & SK Properties Ltd | Real estate | 2024 |
| MA Academy Ltd | Information & communication | 2017 |
| MA Accountancy Limited | Professional & scientific | 2011 |
| MA Courier Service Ltd | Transport & logistics | 2024 |
| MA Flourishing Services Limited | Wholesale & retail | 2013 |
| MA Group Assets Ltd | Financial services | 2023 |
| MA Innovative Services Limited | Hospitality | 2018 |
| MA Khan Locum Ltd | Health & social care | 2023 |
| MA Prime Properties Ltd | Real estate | 2026 |
| MA Properties Midlands Ltd | Real estate | 2024 |
| MA Realisations Limited | Real estate | 2006 |
| Maaya Care Ltd | Health & social care | 2023 |
| MAB Catering Ltd | Hospitality | 2025 |
| MAB Recruitment Solutions Ltd | Administrative & support | 2018 |
| Mabel's Lounge Co Ltd | Hospitality | 2018 |
| Mabwiz Ltd | Professional & scientific | 2024 |
| MAC Acquisitions Limited | Financial services | 2025 |
| MAC Aggregates Ltd | Transport & logistics | 2017 |
| MAC Brownhills Quarry Limited | Mining & quarrying | 2017 |
| MAC Consortium Limited | Professional & scientific | 2015 |
| MAC Contracting (UK) Limited | Manufacturing | 1994 |
| MAC Contracting Limited | Other services | 1997 |