| Mobiverse Ltd | Information & communication | 2021 |
| Modus Commercial Management Ltd | Professional & scientific | 2014 |
| MOE Noble Ltd | Financial services | 2025 |
| Mojo's (Kingswinford) Limited | Other services | 2007 |
| Momentum Dance Academy Ltd | Arts & recreation | 2017 |
| Momi Farms Limited | Construction | 2025 |
| Momma G Ltd | Manufacturing | 2025 |
| Monapark Limited | Professional & scientific | 2001 |
| Monarch Works Ltd | Manufacturing | 2016 |
| Money Transfer 80 Limited | Professional & scientific | 2022 |
| Monkton Properties LLP | | 2008 |
| Monteagle Homes Limited | Real estate | 2005 |
| Monument Computing Ltd | Information & communication | 2010 |
| Mood Kitchens Limited | Wholesale & retail | 2021 |
| Mooma Media Ltd | Information & communication | 2018 |
| Moonrise Events Ltd | Other services | 2021 |
| Moony's Food Ltd | Manufacturing | 2015 |
| Moor Storage Limited | Construction | 1989 |
| Moore Housing Limited | Real estate | 2025 |
| Moowd Limited | Professional & scientific | 2025 |
| Moresuccess Limited | Information & communication | 2017 |
| Morgan & Company Solicitors Limited | Professional & scientific | 2016 |
| Morgan Business Equipment Ltd | Wholesale & retail | 2025 |
| Morgan Haulage (UK) Ltd | Transport & logistics | 2020 |
| Morgan Phelps Limited | Professional & scientific | 2016 |
| Morgan Recruitment Services Ltd | Administrative & support | 2024 |
| Morgans Plantation Shutters & Carpentry Services Limited | Construction | 2022 |
| Morley Haswell Consultants Limited | Professional & scientific | 2003 |
| Mortality Education CIC | Education | 2023 |
| Moss Lettings Limited | Real estate | 2022 |
| Motorwash Services Ltd | Manufacturing | 2003 |
| Mount Pleasant Management Company (Quarry Bank) Limited | Real estate | 2004 |
| Mousesweet Ltd | Construction | 2018 |
| Moving Souls Dance CIC | Arts & recreation | 2017 |
| MP Camera Ltd | Information & communication | 2022 |
| Mpbp Ltd | Professional & scientific | 2014 |
| MPC Lettings Ltd | Real estate | 2023 |
| MPV Rentals Ltd | Real estate | 2022 |
| MR 4 Services Limited | Transport & logistics | 2023 |
| MR Clarkes Stays Ltd | Hospitality | 2025 |
| MR Expert Ltd | Health & social care | 2018 |
| MR Franchise Limited | Professional & scientific | 2010 |
| MR Fried Chicken Limited | Hospitality | 2022 |
| MR Heat Installations Limited | Construction | 2019 |
| MR Properties and SON Limited | Real estate | 2015 |
| MRX Bespoke Joinery Ltd | Manufacturing | 2024 |
| MS Health & Fitness Ltd | Other services | 2019 |
| MS Properties (Stourbridge) Limited | Real estate | 2020 |
| MSB Orthopaedics Limited | Health & social care | 2015 |
| MSG Property Management Services Ltd | Real estate | 2022 |
| Mssh Properties Limited | Real estate | 2023 |
| MT Lofts & Carpentry Ltd | Construction | 2023 |
| MT Prints Limited | Manufacturing | 2019 |
| MTA Lighting Limited | Arts & recreation | 2015 |
| MTB Installations Limited | Construction | 2018 |
| MTD Installations Limited | Construction | 2019 |
| MTL7 Limited | Professional & scientific | 2019 |
| MTP Contracts Limited | Construction | 2012 |
| Muella Ltd | Wholesale & retail | 2021 |
| Muir&Claire Properties Limited | Real estate | 2026 |
| Multiform Tubes Engineering Limited | Manufacturing | 2014 |
| Multiplex Security Communications Limited | Administrative & support | 1987 |
| MW Streetfood Limited | Hospitality | 2022 |
| MW Systems (UK) Limited | Professional & scientific | 2012 |
| My Big House Ltd | Administrative & support | 2013 |
| My Centre Office Limited | Information & communication | 2011 |
| My Coffee Station Cafe Ltd | Hospitality | 2016 |
| My Coffee Station Holdings Limited | Administrative & support | 2021 |
| My Coffee Station Limited | Hospitality | 2003 |
| My Coffee Station Operations Ltd | Administrative & support | 2004 |
| My Coffee Station Presents Ltd | Hospitality | 2016 |
| My Engineering Group Ltd | Professional & scientific | 2023 |
| My Final Station Ltd | Administrative & support | 2021 |
| My GAS Plumbing & Heating Limited | Construction | 2023 |
| My OCD Occupational Care and Cleaning Duties Limited | Health & social care | 2025 |
| My Organisation Station Ltd | Transport & logistics | 2021 |
| My Two Feet Limited | Health & social care | 2012 |
| My Virtual Hub Limited | Administrative & support | 2018 |
| MYA Training Limited | Other services | 2013 |
| Myaarchie Holdings Limited | Real estate | 2025 |
| Myddlewych Limited | Wholesale & retail | 2012 |
| Myers Garage Doors Limited | Construction | 2016 |
| Myford House Limited | Health & social care | 2018 |
| Myles and Lennard Limited | Construction | 1966 |
| Myles Elliot Limited | Real estate | 2021 |
| Myths Lane Ltd | Information & communication | 2024 |
| MZ HGV Limited | Transport & logistics | 2015 |
| N & C Dry-Lining Ltd | Construction | 2021 |
| N a Smith Carpentry & Kitchens Ltd | Manufacturing | 2018 |
| N Clarke Accountancy Ltd | Professional & scientific | 2022 |
| N Ward Holdings Ltd | Financial services | 2024 |
| N.P.7 Limited | Administrative & support | 2014 |
| Nadine Potts Ltd | Professional & scientific | 2019 |
| Nala Couture Ltd | Wholesale & retail | 2020 |
| Nalin's Ltd | Hospitality | 2026 |
| NAM Holdings Ltd | Real estate | 2019 |
| Nanu Universal Ltd | Transport & logistics | 2025 |
| Narvic Properties Limited | Construction | 1988 |
| Nash Works Management Limited | Real estate | 2013 |
| Naski Ltd | Professional & scientific | 2015 |