| Lonsdale Court Management Company Limited | Households | 2001 |
| Lorockmor Working Dogs Limited | Other services | 2013 |
| Love Mondays Ltd | Administrative & support | 2014 |
| Lovelife Pharmacies Ltd | Professional & scientific | 2012 |
| Lovely Littles & Co (Shropshire) Ltd | Wholesale & retail | 2016 |
| Lowe and Fletcher International Limited | Manufacturing | 1934 |
| Lowe and Fletcher Limited | Manufacturing | 1976 |
| LSH Kidderminster Limited | Other services | 2015 |
| Ludlow Gate (Bridgnorth) Management Company Limited | Real estate | 2009 |
| Luton Manor Ltd | Real estate | 2019 |
| Lynch & Yardley Ltd | Professional & scientific | 2022 |
| Lyncraft Marketing & Exhibitions Limited | Manufacturing | 2003 |
| Lynton Engineering Services Ltd | Manufacturing | 2002 |
| M & H Littleford Limited | Real estate | 2021 |
| M & N Forklift Transport Limited | Wholesale & retail | 2012 |
| M & S Butchers Limited | Wholesale & retail | 2008 |
| M Archer Agricultural Services Ltd | Agriculture & fishing | 2021 |
| M E & SON Contracting Ltd | Construction | 2022 |
| M R Building Consultants Limited | Professional & scientific | 2026 |
| M.B. Smith & Co Ltd | Financial services | 2003 |
| M.W.D. Services Limited | Construction | 1995 |
| Machines and Controls Ltd | Manufacturing | 2018 |
| Madness Wholesale Ltd | Wholesale & retail | 2026 |
| Magnesium Metals & Charcoal Limited | Manufacturing | 1991 |
| Maigate Development Limited | Construction | 2015 |
| Malcolm Brown Property Limited | Real estate | 2023 |
| Malcolm Brown Retail Limited | Wholesale & retail | 2019 |
| Manfield-Yorke Limited | Real estate | 2017 |
| Mango-Group Ltd | Administrative & support | 2011 |
| Manley & Regulus Limited | Extraterritorial | 2006 |
| Manor Farm 9 Ltd | Construction | 2021 |
| Manuscript Brands Limited | Extraterritorial | 2022 |
| Manuscript PEN Company Ltd | Manufacturing | 1989 |
| March Communications Ltd | Information & communication | 2023 |
| Mardon Engineering Co. Limited | Manufacturing | 1975 |
| Margin Department Limited | Professional & scientific | 2024 |
| Margoon Limited | Hospitality | 2017 |
| Marlborough Flying Club Ltd | Arts & recreation | 2024 |
| Massey Engineering Limited | Extraterritorial | 2002 |
| Matthews Mobile Mechanic Ltd | Professional & scientific | 2026 |
| Mawley Minibus Company Ltd | Transport & logistics | 2024 |
| Maxim Management Limited | Other services | 2019 |
| Maximilian Archibald Designs Limited | Construction | 2018 |
| Mccormack Financial Advisers Ltd | Professional & scientific | 2016 |
| Medacare Ltd | Professional & scientific | 2013 |
| Media Parents Limited | Administrative & support | 2010 |
| Medinspire Ltd | Professional & scientific | 2014 |
| Medluma Skin Clinic Limited | Extraterritorial | 2022 |
| Medusa's Firey Hot BBQ Joint Ltd | Hospitality | 2017 |
| MEG Hawkins Ltd. | Manufacturing | 2016 |
| MEL Rowley Racing Limited | Arts & recreation | 2021 |
| Melita Imaging Limited | Health & social care | 2021 |
| Mellor Motorsport Ltd | Wholesale & retail | 2023 |
| MH Roofing (Shropshire) Ltd | Construction | 2026 |
| MH Vehicle Transport Limited | Transport & logistics | 2019 |
| Michael Flanagan Developments Ltd | Construction | 2023 |
| Michael Surzyn Limited | Professional & scientific | 2011 |
| Michael Timms Ltd | Professional & scientific | 2010 |
| Mida International Limited | Administrative & support | 1999 |
| Midland Aggregates Ltd | Mining & quarrying | 2015 |
| Midland Commercial Properties Group Limited | Financial services | 2019 |
| Midland Commercial Properties Limited | Construction | 1969 |
| Midland Precision Blasting Limited | Construction | 2018 |
| Midland Technology Solutions Limited | Information & communication | 2011 |
| Midlands Automotives Ltd | Wholesale & retail | 2022 |
| Midlands Taverns (Birmingham) Limited | Wholesale & retail | 2016 |
| Midshire Interiors Limited | Construction | 2012 |
| Mill Street Properties Limited | Wholesale & retail | 1995 |
| Millie's Place Ltd | Hospitality | 2019 |
| Millies Tearoom by the Mill Ltd | Hospitality | 2026 |
| Millington Engineering Ltd | Manufacturing | 2015 |
| Mimijumi UK Limited | Wholesale & retail | 2012 |
| Mimusic Ltd | Information & communication | 2008 |
| Mindplay Limited | Financial services | 2003 |
| Mindunity Ltd | Health & social care | 2022 |
| Mineseeker Foundation | Administrative & support | 2001 |
| Mini Digging Services Limited | Construction | 2010 |
| Mister Cheese Limited | Manufacturing | 2021 |
| Misty Flip Games Limited | Information & communication | 2023 |
| Mitchair Ltd | Administrative & support | 2024 |
| MJ Hadley (Builders) Ltd | Construction | 2007 |
| MJP Groundworks & Construction Ltd | Administrative & support | 2016 |
| MJR Property Solutions Ltd | Construction | 2023 |
| MJT Coaching & Consultancy Ltd | Professional & scientific | 2022 |
| Mlil Limited | Hospitality | 2019 |
| MLR Beauty Ltd | Other services | 2024 |
| MMB Services Ltd | Manufacturing | 2017 |
| MN Capital Investments Ltd | Real estate | 2025 |
| Mobile Workspace Solutions Ltd | Wholesale & retail | 2025 |
| Mondes Projects Ltd | Construction | 2023 |
| Monkfish Design Limited | Professional & scientific | 2016 |
| Monkhopton Estate Limited | Real estate | 2019 |
| Montclair Limited | Health & social care | 2025 |
| Montpellier Finance Ltd | Financial services | 2015 |
| MOR Brook Solutions Ltd | Real estate | 2026 |
| Morgan & GUY Properties Ltd | Real estate | 2007 |
| Morgan & SON Holdings Limited | Professional & scientific | 2005 |
| Morgan Springs (Bridgnorth) Management Company Limited | Households | 2003 |
| Morris Construction Solutions Limited | Professional & scientific | 2006 |
| Mortimers Solicitors Limited | Professional & scientific | 2016 |