| Mackie Industries Limited | Real estate | 2012 |
| Macmullen Estates Limited | Construction | 2010 |
| MAD Engineering Solutions Limited | Professional & scientific | 2022 |
| MAD Harper Ltd | Hospitality | 2025 |
| Madafu Properties Limited | Real estate | 2022 |
| Made for Moments Limited | Arts & recreation | 2025 |
| Maggy PIE Ltd | Arts & recreation | 2011 |
| Maghitrans Ltd | Transport & logistics | 2020 |
| Magic Marcus Surface Repairs Ltd | Other services | 2021 |
| Magnar Homes (Parkfield) Ltd | Administrative & support | 2025 |
| Magnar Homes (Villa Farm) Ltd | Administrative & support | 2025 |
| Magnar Homes Ltd | Administrative & support | 2025 |
| Magnet Building Limited | Construction | 2014 |
| Magnet Holdings Limited | Financial services | 2023 |
| Magnet Plant Hire Ltd | Administrative & support | 2017 |
| Magnificent Tape and Joint Limited | Construction | 2023 |
| Magnum Motorsport Limited | Wholesale & retail | 2025 |
| Magnum Trials Centre Limited | Arts & recreation | 2014 |
| Mainco Wire Ropes Limited | Manufacturing | 2005 |
| Maire Childcare and Education Services Ltd | Administrative & support | 2008 |
| Maison Mutt Ltd | Wholesale & retail | 2025 |
| Majestic Bar and Grill @ the Golden Cross Limited | Hospitality | 2025 |
| Majestic LEE Limited | Professional & scientific | 2017 |
| Majestic Pride Properties Ltd | Real estate | 2025 |
| Make Your Company Ltd | Professional & scientific | 2011 |
| Malc's Barbers Limited | Other services | 2016 |
| Malc's Camping Caravan and Leisure Ltd | Wholesale & retail | 2012 |
| Malkey Investments Ltd | Real estate | 2016 |
| Malmberg Limited | Professional & scientific | 2012 |
| Malvern Homes (Cleeve Prior) Limited | Other services | 2017 |
| Malvern Homes Limited | Real estate | 2010 |
| MAM Catering Redditch Ltd | Hospitality | 2024 |
| Mandl Partnership Limited | Administrative & support | 2012 |
| Mango & Lime Property Ltd | Real estate | 2020 |
| Mango Leisure Ltd | Arts & recreation | 2025 |
| Manjen Ltd | Transport & logistics | 2019 |
| Manor Bathrooms Limited | Construction | 2024 |
| Manufacturing Capacity Solutions Limited | Manufacturing | 2008 |
| Maon Limited | Information & communication | 2005 |
| Maple (264) Limited | Households | 2005 |
| Maple FOX Media Ltd | Professional & scientific | 2025 |
| Maqsood Ahmed Limited | Wholesale & retail | 2025 |
| Mara FB Ltd | Wholesale & retail | 2023 |
| Marbog Limited | Transport & logistics | 2018 |
| Mare & Foal Ltd | Information & communication | 2026 |
| Marel Property Solutions Ltd | Construction | 2023 |
| Margenii Ltd | Information & communication | 2024 |
| Mariana Prajituri Limited | Manufacturing | 2022 |
| Mark Chambers Plumbing and Heating Limited | Construction | 2005 |
| Mark Hughes EPC Ltd | Professional & scientific | 2022 |
| Mark Hughes Events Ltd | Administrative & support | 2024 |
| Mark IT Fresh Limited | Wholesale & retail | 2013 |
| Mark J. Harris Limited | Construction | 2003 |
| Mark R Bennett Property Ltd | Construction | 2013 |
| Mark Tyzack & Sons Limited | Transport & logistics | 1909 |
| Mark-Francis Property Holdings Limited | Real estate | 2025 |
| Market Strategy UK Ltd | Professional & scientific | 2018 |
| MARKET2WIN Limited | Professional & scientific | 2005 |
| Marketing Investments Two Limited | Financial services | 2021 |
| Marks Cars and Repairs Ltd | Wholesale & retail | 2022 |
| Marlbrook Bloodstock Limited | Agriculture & fishing | 2020 |
| Marlbrook Investments Ltd | Real estate | 2020 |
| Marlbrook Property Ltd | Construction | 2020 |
| Marlowe Partners Ltd | Information & communication | 2025 |
| Marrs Bars Limited | Other services | 2017 |
| Marsham Tyre Company,Limited(The) | Professional & scientific | 1923 |
| Marson HAM Ltd | Construction | 2024 |
| Martin Hospitality Ltd | Hospitality | 2024 |
| Martin Preece Plumbing Services Limited | Construction | 2003 |
| Martley Cricket Club Pavillion CIC | Hospitality | 2026 |
| Martrix Limited | Construction | 2021 |
| Marvel Property Management Limited | Households | 2020 |
| Marvelous Living CIC | Hospitality | 2025 |
| Marvix Ltd | Wholesale & retail | 2008 |
| Mason's Car Sales Limited | Wholesale & retail | 2024 |
| Masons EVE Maintenance Ltd | Administrative & support | 2015 |
| Massey Plant Ltd | Construction | 2023 |
| Massey Technical Services Limited | Information & communication | 2006 |
| MAT & ANT Grab Hire Ltd | Administrative & support | 2017 |
| Matchborough First School Academy | Education | 2013 |
| Mateen Hussain Limited | Transport & logistics | 2022 |
| Matei Cristian Trans Ltd | Transport & logistics | 2015 |
| Mateline Engineering Limited | Manufacturing | 1970 |
| Material Trading Solutions Ltd | Wholesale & retail | 2025 |
| Maternology Ltd | Health & social care | 2019 |
| Mathias Trans Ltd | Transport & logistics | 2019 |
| Matthew Moore Music Ltd | Information & communication | 2018 |
| Matusa G Cristian Limited | Transport & logistics | 2021 |
| Maver (UK) Limited | Wholesale & retail | 1992 |
| Maxey Moverley Holdings Limited | Financial services | 2021 |
| Maxey Moverley Limited | Manufacturing | 1996 |
| Maxi Grosik 1 Ltd | Wholesale & retail | 2022 |
| Maximus Gripping Limited | Professional & scientific | 2022 |
| Maxmon K9 Ltd | Financial services | 2025 |
| Maxs Motors Limited | Wholesale & retail | 2018 |
| Maxwell Jones Studios Limited | Manufacturing | 1975 |
| Maxx Tattoo Studio Limited | Other services | 2003 |
| Maybell Investments Limited | Hospitality | 2015 |
| Maybrook Fortnum Ltd | Real estate | 2006 |
| Mayfield Heating Ltd | Construction | 2023 |