| Malcolm Enamellers ACP Limited | Manufacturing | 1996 |
| Malcolms ACP Limited | Manufacturing | 1976 |
| Malcolms Management Limited | Real estate | 1960 |
| Malik Auto Deals Ltd | Wholesale & retail | 2025 |
| Manchester Barbers Limited | Other services | 2016 |
| Manley House (Warwickshire) Ltd | Hospitality | 2024 |
| Maras Property Ltd | Real estate | 2024 |
| Maras Trading Limited | Wholesale & retail | 2024 |
| Marcus Cargo Ltd | Transport & logistics | 2018 |
| Marika Creation Limited | Professional & scientific | 2023 |
| Marketing Bubble Ltd | Professional & scientific | 2021 |
| Marston Auto Parts Ltd | Wholesale & retail | 2023 |
| Marston Convenience Store Ltd | Wholesale & retail | 2015 |
| Marston Environmental Services Ltd | Water & waste | 2003 |
| Master Smart Limited | Professional & scientific | 2020 |
| Matrix Motor Group Limited | Wholesale & retail | 2025 |
| Matt&Seb Building Service & Maintenance Ltd | Construction | 2024 |
| Matthew Robinson Mortgages Ltd | Financial services | 2023 |
| Mavux Ltd | Transport & logistics | 2026 |
| Maxia Property Holdings Limited | Real estate | 2016 |
| Mayabbey Construction Limited | Construction | 2017 |
| MB Property Lawyers (Northants) Limited | Professional & scientific | 2026 |
| MCS Group Midlands Ltd | Administrative & support | 2025 |
| Mechanic 4U Ltd | Wholesale & retail | 2023 |
| Mediterranean Caffe Limited | Hospitality | 2022 |
| Mega Joinery Ltd | Manufacturing | 2023 |
| Meghna Indian Takeaway Ltd | Hospitality | 2024 |
| Meilleur Ltd | Administrative & support | 2016 |
| Mendabath West Midlands Ltd | Professional & scientific | 2016 |
| Metrologiq Solutions Limited | Professional & scientific | 2025 |
| MG Rover Events Limited | Administrative & support | 2025 |
| MID Oak Services Ltd | Administrative & support | 2018 |
| Middlemas Ltd | Manufacturing | 2010 |
| Midland Conversions Ltd | Manufacturing | 2025 |
| Midland Mass Properties Ltd | Real estate | 2025 |
| Midland Transmission Components Ltd | Wholesale & retail | 2023 |
| Midlands Garden & Landscaping Ltd | Administrative & support | 2021 |
| Midlands Home Services Limited | Construction | 2018 |
| Migrantrefugee Mentor Limited | Hospitality | 2022 |
| Mike KAY Engineering Ltd | Professional & scientific | 2019 |
| MIL Investments Ltd | Real estate | 2016 |
| Miller PIC Ltd | Professional & scientific | 2022 |
| Miss FJ Ltd | Hospitality | 2017 |
| Mobytrans Limited | Transport & logistics | 2016 |
| Mold the World Ltd | Extraterritorial | 2021 |
| Mona Ventures Limited | Health & social care | 2022 |
| Monahen Management Company Limited | Real estate | 2025 |
| Monolith Enterprises Ltd | Information & communication | 2017 |
| Moonrock Fine Diamonds Ltd | Wholesale & retail | 2025 |
| Mossair Ltd | Manufacturing | 2020 |
| MOVE4YOU24 Ltd | Transport & logistics | 2024 |
| Mowbray Accounting Limited | Professional & scientific | 2010 |
| MPH Construction Solutions Ltd | Administrative & support | 2017 |
| MR04ZVA Ltd | Health & social care | 2022 |
| MTD Trading Limited | Wholesale & retail | 2009 |
| Mucky Pups Pet Grooming Ltd | Other services | 2021 |
| Mucky Pups Training Academy Ltd | Education | 2023 |
| Multico Corp Ltd | Construction | 2020 |
| Muson Ltd | Professional & scientific | 2017 |
| MW Build Ltd | Construction | 2018 |
| MW Heating & Plumbing Limited | Construction | 2024 |
| My Fulham House Ltd | Hospitality | 2019 |
| My Influencer Network Limited | Information & communication | 2020 |
| Mydlikowski Ltd | Transport & logistics | 2014 |
| Mystar Healthcare Limited | Health & social care | 2022 |
| Mythe Cleaning Limited | Other services | 2014 |
| N & C Corporate Limited | Hospitality | 2016 |
| Nail Gaga Limited | Wholesale & retail | 2010 |
| Narli Transport Ltd | Transport & logistics | 2025 |
| National Haulage Ltd | Transport & logistics | 2021 |
| Natt Constructions Ltd | Construction | 2017 |
| Natures View Ltd | Administrative & support | 2021 |
| Naveed & Sons Enterprise Ltd | Construction | 2017 |
| Naveen PAL Limited | Construction | 2019 |
| NAY Investments Ltd | Real estate | 2023 |
| NAZ Organisation Limited | Administrative & support | 2025 |
| NC Compliance Limited | Professional & scientific | 2016 |
| NC Contract Services Limited | Construction | 2018 |
| Neirja's Ltd | Wholesale & retail | 2023 |
| NET Positive Advisors Limited | Professional & scientific | 2013 |
| New Hope Developments Ltd | Real estate | 2025 |
| New Look Park Homes Ltd | Other services | 2018 |
| New Structures Limited | Real estate | 2006 |
| Newdigate Builders Bedworth Limited | Construction | 2011 |
| Nico Holdings Limited | Real estate | 2024 |
| Nikkit Homes Limited | Real estate | 2023 |
| Njmb Logistics Limited | Transport & logistics | 2019 |
| NM8 Limited | Construction | 2024 |
| Noisy Visuals Ltd | Wholesale & retail | 2010 |
| Noodle Homes Ltd | Real estate | 2025 |
| Nora Nails Bar Ltd | Other services | 2025 |
| Nova Project Solutions Ltd | Extraterritorial | 2022 |
| NS Trading Technologies Ltd | Administrative & support | 2018 |
| NSO Oils Ltd | Administrative & support | 2014 |
| O.V.Pop Transport Ltd | Administrative & support | 2019 |
| Oakfield Electrical (Midlands) Ltd | Construction | 2025 |
| Oakwell Hand Car Wash Ltd | Wholesale & retail | 2018 |
| Objex Consultancy Limited | Information & communication | 2015 |
| Ocean & Magma Ltd | Hospitality | 2021 |
| Off-Balance Dance CIC | Arts & recreation | 2018 |