| LMP Travel Services Ltd | Administrative & support | 2016 |
| Loadwise International Limited | Manufacturing | 1985 |
| Logiplast Limited | Manufacturing | 2015 |
| Lollys Properties Ltd | Real estate | 2024 |
| Lombard Car Sales Ltd | Wholesale & retail | 2021 |
| Lombard Group Developments Limited | Real estate | 2010 |
| London Urology Specialists Limited | Health & social care | 2018 |
| Lovesey Property Limited | Real estate | 2024 |
| Lovington Logs Limited | Wholesale & retail | 2025 |
| LR Digital Consultancy Ltd | Professional & scientific | 2015 |
| LS Cooper Services Ltd | Water & waste | 2019 |
| LSC Software Limited | Information & communication | 2014 |
| Lucid Icons Ltd | Arts & recreation | 2019 |
| Ludlow Nspa Ltd | Wholesale & retail | 2015 |
| Lukeridge Limited | Wholesale & retail | 1985 |
| Lyco Recycling Limited | Water & waste | 2018 |
| Lyco Waste Services Ltd | Water & waste | 2020 |
| M & a Gorry Ltd. | Professional & scientific | 2018 |
| M & C Travel Ltd | Administrative & support | 2016 |
| M F B Legal Ltd | Professional & scientific | 2016 |
| M H Garden & Tree Services Ltd. | Administrative & support | 2016 |
| M&C Limited | Extraterritorial | 2018 |
| M.C.L. Systems Ltd | Professional & scientific | 2018 |
| M.H. Bevere Limited | Construction | 2013 |
| M4 IT Services Limited | Information & communication | 2025 |
| M555 Properties Ltd | Real estate | 2022 |
| Maccec Limited | Financial services | 2020 |
| Maddison Harborne Limited | Wholesale & retail | 2012 |
| MAG Fire Solutions UK Limited | Public administration | 2024 |
| Magpie Leisure Ltd | Hospitality | 2023 |
| Mahi House Ltd | Hospitality | 2025 |
| Maisha (Stourport) Ltd | Other services | 2016 |
| Mallin Plumbing Limited | Construction | 2010 |
| Malvern Contractors Limited | Construction | 2010 |
| Malvern Edge Court Limited | Households | 1994 |
| Mana Mart UK Ltd | Wholesale & retail | 2025 |
| Manyrth Ltd | Wholesale & retail | 2018 |
| Maple Woodworking Design Limited | Manufacturing | 2005 |
| Mapleband Ltd | Wholesale & retail | 2018 |
| Mareedu & Murala UK Limited | Health & social care | 2023 |
| Mark Kilner Home Improvements Ltd | Construction | 2018 |
| Mark Leaning Carpentry Ltd | Construction | 2019 |
| Marketive Ltd | Other services | 2025 |
| Marketvirtable Ltd | Administrative & support | 2019 |
| Marlpoint Property Co. Limited | Construction | 1971 |
| Marshall Commerce Ltd | Wholesale & retail | 2025 |
| Marts Car Parts UK Limited | Wholesale & retail | 2021 |
| Maya & Co Ltd | Extraterritorial | 2012 |
| Mayfair Nannies Ltd | Administrative & support | 2024 |
| Mayville Development Limited | Construction | 2009 |
| MB Fit-Outs Ltd | Construction | 2018 |
| MBE Holdings Limited | Wholesale & retail | 2025 |
| MC2 Audio Ltd | Extraterritorial | 1992 |
| Mcewen Racing Limited | Professional & scientific | 2016 |
| MDM Properties Limited | Households | 2007 |
| Meraki Van Ltd | Hospitality | 2021 |
| Merge Media Limited | Extraterritorial | 2007 |
| Merrylegs Farm Limited | Arts & recreation | 2025 |
| Metabolism Analytics Limited | Other services | 2022 |
| Metering Technology Services Ltd | Manufacturing | 2014 |
| Metronxo Ltd | Administrative & support | 2019 |
| MF Clinics Ltd | Health & social care | 2025 |
| MHS IT Consultancy Limited | Information & communication | 2011 |
| MI Solutions Automation Limited | Manufacturing | 2012 |
| MI Solutions Automotion Ltd | Wholesale & retail | 2024 |
| MID City Facades Limited | Construction | 1994 |
| Middleton Interim Limited | Administrative & support | 2008 |
| Midhaven Limited | Wholesale & retail | 1983 |
| Midlands G&M Ltd | Wholesale & retail | 2026 |
| Midlands Matting Limited | Wholesale & retail | 2024 |
| Mikon Contract Carpets Limited | Construction | 2022 |
| Mikon Flooring Limited | Administrative & support | 2012 |
| Miltiadou Enterprises Ltd | Professional & scientific | 2009 |
| MIRACLE17 Limited | Health & social care | 2023 |
| Missionrealty Ltd | Administrative & support | 2019 |
| Mitre Oak Ventures Ltd | Manufacturing | 2022 |
| MJ Motor Repairs (Worcestershire) Ltd | Wholesale & retail | 2017 |
| MMG Support. Ltd | Manufacturing | 2011 |
| Modnanos Ltd | Transport & logistics | 2019 |
| Moghul Interiors Limited | Manufacturing | 2005 |
| Mojo Move Ltd | Real estate | 2022 |
| Monarch Storage Services Ltd | Real estate | 2026 |
| Monham Ltd | Administrative & support | 2019 |
| Monkey Mania (Ludlow) Limited | Arts & recreation | 2014 |
| MOO & GOO Limited | Arts & recreation | 2015 |
| Moorhouse Developments Ltd | Construction | 2025 |
| Moorhouse Energy Ltd | Construction | 2025 |
| Moorhouse Manor (NO.1) Ltd | Construction | 2025 |
| Moorhouse Manor Ltd | Households | 2025 |
| Morelink Limited | Real estate | 1993 |
| Morgan Technical Ceramics Limited | Manufacturing | 1932 |
| Morgan-King Limited | Wholesale & retail | 2017 |
| Morley Properties Ltd | Real estate | 2018 |
| Morning Wood Holdings Ltd | Financial services | 2026 |
| Morning Wood Private Hire Ltd | Transport & logistics | 2026 |
| Mosnul Real Estate Ltd | Real estate | 2013 |
| Motorbike MAD Ltd | Wholesale & retail | 2018 |
| Mozcomm Ltd | Information & communication | 2022 |
| MPB Dynamics Limited | Professional & scientific | 2022 |
| MR Auto Services Midlands Limited | Manufacturing | 2004 |