| Mockbroccoli Ltd | Transport & logistics | 2019 |
| Modern Design Services Limited | Professional & scientific | 2008 |
| Modern Edge Recruitment (Kidderminster) Ltd | Administrative & support | 2024 |
| Modular Steelwork Ltd | Extraterritorial | 2018 |
| Moerver Ltd | Transport & logistics | 2024 |
| Moirverna Ltd | Administrative & support | 2024 |
| Mojuhzith Ltd | Hospitality | 2023 |
| Molegeoiux Ltd | Administrative & support | 2024 |
| Momentum Gymnastics Ltd | Education | 2023 |
| Moncrieff Financial Consultancy Ltd | Professional & scientific | 2020 |
| Moneywise Education Services Ltd | Extraterritorial | 2021 |
| Moneywise Midlands Limited | Real estate | 2015 |
| Monnedza Ltd | Administrative & support | 2024 |
| Monosol AF, Ltd. | Manufacturing | 2000 |
| Monscay Ltd | Administrative & support | 2024 |
| Montgarrie Ltd | Transport & logistics | 2021 |
| Moody COW Grafix Ltd | Manufacturing | 2023 |
| Moonlightplaza Ltd | Wholesale & retail | 2019 |
| Moonzium Ltd | Wholesale & retail | 2024 |
| Moore Automotive Vehicle Logistics Limited | Transport & logistics | 2019 |
| Moore Storage Space Limited | Transport & logistics | 2024 |
| Mophizior Ltd | Hospitality | 2023 |
| Mopolra Ltd | Wholesale & retail | 2018 |
| Moreseries Limited | Households | 2000 |
| Moreton Transport Limited | Transport & logistics | 2007 |
| Morgan & Co Developments Limited | Construction | 2024 |
| Morgan Assets Ltd | Financial services | 2026 |
| Morgan Bespoke Ltd | Manufacturing | 2018 |
| Morgan Bros Construction Ltd | Construction | 2022 |
| Morgan Evans Business Services Limited | Agriculture & fishing | 2010 |
| Morgan Residences Ltd | Real estate | 2025 |
| Moriiezy Ltd | Hospitality | 2023 |
| Morsecap Ltd | Real estate | 2021 |
| Morsepark Ltd | Real estate | 2021 |
| Mortdiver Ltd | Wholesale & retail | 2018 |
| Mortgage Solutions Hub Limited | Financial services | 2023 |
| Mortimer Childe Accounting Ltd | Professional & scientific | 2019 |
| Mortimer Childe Ltd | Professional & scientific | 2014 |
| Mortimer Childe Services Limited | Professional & scientific | 2019 |
| Mortimer Plaice Ltd | Hospitality | 2025 |
| Morton Fisher Limited | Professional & scientific | 1988 |
| Most Traffic Managements Ltd | Construction | 2023 |
| Motiv Trailer Equipment (MTE) Limited | Manufacturing | 2021 |
| Motive Zero Ltd | Professional & scientific | 2019 |
| Motiveheat Ltd | Professional & scientific | 2016 |
| Motor Mechanic Specialists Ltd | Wholesale & retail | 2024 |
| Motor Technics Valley Commercials Limited | Wholesale & retail | 2022 |
| Movezee Retail Ltd | Wholesale & retail | 2025 |
| Moxie People Consultancy Ltd | Professional & scientific | 2022 |
| Mozivrif Ltd | Wholesale & retail | 2022 |
| MP Business Enterprise Ltd | Administrative & support | 2025 |
| MP Decorating Contractors Limited | Construction | 2025 |
| Mpreal Limited | Real estate | 2019 |
| MPW UK Services Ltd | Construction | 2025 |
| MR Auto Care Ltd | Wholesale & retail | 2022 |
| MR Move-It (Kidderminster) Limited | Other services | 2014 |
| MRC Building & Refurbishment Ltd | Construction | 2026 |
| MSM Live Ltd | Arts & recreation | 2022 |
| MT Kare Ltd | Health & social care | 2026 |
| MT Medica Limited | Health & social care | 2019 |
| MTL Property Management Limited | Households | 2013 |
| Mtme Consultancy Limited | Administrative & support | 2019 |
| Mucky Pups Wash and Go Ltd | Manufacturing | 2024 |
| MUD FC Ltd | Arts & recreation | 2025 |
| Mud-Football-Club- Ltd | Arts & recreation | 2025 |
| Muhammad Nadeem Ltd | Transport & logistics | 2025 |
| Mureruff Ltd | Administrative & support | 2024 |
| Mushayi Engineering Limited | Construction | 2011 |
| Musitionently Ltd | Health & social care | 2021 |
| Muttley Crue Ltd | Other services | 2018 |
| Muvedurts Ltd | Wholesale & retail | 2021 |
| MW Jewellery Limited | Manufacturing | 2025 |
| Mwbc Developments Limited | Construction | 2015 |
| Mwbc Group Limited | Extraterritorial | 2017 |
| Mwbt Ltd | Information & communication | 2014 |
| MWG Management & Consultancy Limited | Administrative & support | 2012 |
| MWP Training Solutions Ltd | Administrative & support | 2019 |
| MWT Property Ltd | Real estate | 2019 |
| MX Hodge Ltd | Administrative & support | 2022 |
| My Purse Limited | Extraterritorial | 2016 |
| Myappetite Limited | Information & communication | 2019 |
| Myles Elliot Residential Limited | Real estate | 2018 |
| Mypod Foot Clinic Ltd | Health & social care | 2012 |
| Myriadstardivision Ltd | Administrative & support | 2019 |
| Myrtus Consulting Limited | Professional & scientific | 2023 |
| Mystique R'Mary Ltd | Health & social care | 2024 |
| N a Jones Plumbing and Heating Limited | Construction | 2014 |
| N a S Heating and Plumbing Limited | Construction | 2008 |
| N&D Group Holdings Ltd | Manufacturing | 2026 |
| Nabils Spice Limited | Hospitality | 2023 |
| Nainza Ltd | Administrative & support | 2024 |
| Narrowbond Limited | Financial services | 1986 |
| Narrowsprings Ltd | Hospitality | 2019 |
| Narthzith Ltd | Hospitality | 2023 |
| Nationwide Roofing Maintenance Ltd | Construction | 2025 |
| Nationwide Soft Strip Ltd | Construction | 2020 |
| Nationwide Specialist Projects Limited | Construction | 2014 |
| Natural Land (UK) Limited | Real estate | 2000 |
| Nature and Art Limited | Wholesale & retail | 2002 |
| Nature's Design Studio Ltd | Wholesale & retail | 2015 |