| Marshall Harmony Training Ltd | Education | 2024 |
| Marston Brassware Limited | Manufacturing | 2003 |
| Martin Edwards Legal Services Ltd | Professional & scientific | 2012 |
| Martin J Edwards Ltd | Administrative & support | 2024 |
| Martin's Transport (Telford) Limited | Transport & logistics | 2018 |
| Martin-Kaye LLP | | 2006 |
| Marysia Superstore Ltd | Wholesale & retail | 2025 |
| Mascott International Holdings Limited | Financial services | 2023 |
| Mason Properties Group Ltd | Real estate | 2020 |
| Masontech Ltd | Wholesale & retail | 2025 |
| Masri Limited | Health & social care | 2025 |
| Massimosky Ltd | Construction | 2018 |
| Massive Heart Consulting Limited | Education | 2007 |
| Masstech Group Holdings Ltd | Financial services | 2025 |
| Masstech Solutions Ltd | Manufacturing | 2021 |
| Master Drives Construction Limited | Construction | 2016 |
| Master MED Pharma Ltd | Professional & scientific | 2022 |
| Masterhub Ltd | Administrative & support | 2026 |
| Matas Transport Ltd | Transport & logistics | 2017 |
| Matheson Boyd Ltd | Information & communication | 2019 |
| Matiksus Ltd | Wholesale & retail | 2019 |
| Matix Ltd | Other services | 2019 |
| Matrix Systems Global Limited | Construction | 2025 |
| Matson Holdings Limited | Financial services | 2018 |
| Matt Logistics Ltd | Transport & logistics | 2025 |
| Matt the Handyman Garden & Home Reliable Services Ltd | Other services | 2025 |
| Matthew LEA Golf Limited | Wholesale & retail | 2014 |
| Maunur Ltd | Other services | 2019 |
| Maverick Penguin Ltd | Arts & recreation | 2024 |
| MAVERICK4 Properties Limited | Real estate | 2005 |
| Mavinka Ltd | Other services | 2019 |
| Maws Craft Centre (Jackfield) Ltd. | Real estate | 1988 |
| Maxfield FX Trading Ltd | Administrative & support | 2022 |
| Maxfield Property Investments Ltd | Real estate | 2020 |
| Maxime Bathroom Furniture Ltd | Manufacturing | 2024 |
| Maxra Media Limited | Professional & scientific | 2024 |
| Maxtto Trading UK Limited | Transport & logistics | 2003 |
| Maybach Green Limited | Construction | 2018 |
| Maybank Properties (Shropshire) Limited | Real estate | 2017 |
| Mayfair Web Ltd | Information & communication | 2025 |
| Mayfields Commercial Ltd | Wholesale & retail | 2026 |
| Mayo-Chand Ltd | Manufacturing | 2024 |
| Mayops Ltd | Administrative & support | 2025 |
| Mayteez Care Solutions Ltd | Administrative & support | 2024 |
| Maytom Webb Associates Limited | Information & communication | 1997 |
| MAZ Hair Extensions Ltd | Other services | 2025 |
| MB & M Limited | Professional & scientific | 1992 |
| MB Interiors (Shropshire) Limited | Other services | 2016 |
| Mbam Limited | Health & social care | 2020 |
| MBB Health Limited | Health & social care | 2015 |
| MBM Holdings (Telford) Ltd | Financial services | 2022 |
| MBS Superleague Ltd | Manufacturing | 2013 |
| MC Crown Autos Ltd | Wholesale & retail | 2025 |
| MC Services (UK) Limited | Construction | 2006 |
| Mcange Company Ltd | Transport & logistics | 2024 |
| Mccarron Coyle Homes Limited | Construction | 2018 |
| Mcgilligan Group Ltd | Health & social care | 2025 |
| MCH Sales & Distribution Limited | Wholesale & retail | 2025 |
| Mchale Engineering Services Limited | Other services | 2016 |
| Mckay & Sons Ltd | Health & social care | 2023 |
| Mcketch Holdings Ltd | Administrative & support | 2025 |
| MCL Financial Limited | Financial services | 2020 |
| Mcphillips (Wellington) Limited | Construction | 1964 |
| Mcphillips 2016 Ltd | Financial services | 2016 |
| Mcphillips Estates Ltd | Real estate | 2018 |
| MD 1 Transport Limited | Transport & logistics | 2018 |
| MD Cars Telford Ltd | Wholesale & retail | 2016 |
| MD School of Performing Arts Ltd | Arts & recreation | 2012 |
| MD Secure Property Limited | Real estate | 2019 |
| MD Taylor Funding Limited | Financial services | 2024 |
| Mdaa Property Limited | Real estate | 2019 |
| MDG Motor Services Ltd | Wholesale & retail | 2016 |
| MDH Enterprises Telford Limited | Transport & logistics | 2016 |
| MDI Global Ltd | Extraterritorial | 2013 |
| MDL Classics Ltd | Wholesale & retail | 2023 |
| MDL Supercars Ltd | Wholesale & retail | 2024 |
| MDS Motor and Drive Solutions Ltd | Wholesale & retail | 2022 |
| MDS Motor Group Ltd | Wholesale & retail | 2025 |
| MDS Properties Services Ltd | Real estate | 2016 |
| Mdsy Health Ltd | Health & social care | 2022 |
| MDT Reprographics Limited | Administrative & support | 1991 |
| Meadow Dale Investments Ltd | Real estate | 2024 |
| MEATS4LESS Limited | Hospitality | 2020 |
| Mechelec Maintenance Ltd | Manufacturing | 2016 |
| Medellin Ltd | Other services | 2019 |
| Mediapms Limited | Manufacturing | 2022 |
| Medkore Limited | Health & social care | 2018 |
| Medl Care Limited | Health & social care | 2023 |
| Medrics Ltd | Hospitality | 2024 |
| Medshires Limited | Wholesale & retail | 2002 |
| Medtree Limited | Wholesale & retail | 2014 |
| Meedat Care Ltd | Health & social care | 2023 |
| Meela Ltd | Professional & scientific | 2018 |
| Megagal Ltd | Other services | 2019 |
| Megan Brown Ltd | Wholesale & retail | 2011 |
| Mehra & Sons Property Investments Ltd | Real estate | 2025 |
| MEI PIN Limited | Hospitality | 2026 |
| MEJ Consultants Limited | Real estate | 2022 |
| Mejer Estates Ltd | Real estate | 2023 |
| Mekyns Collection Ltd | Wholesale & retail | 2026 |