| MILANOHOLDINGS1 Ltd | Real estate | 2026 |
| Miles Dandey Ltd | Construction | 2024 |
| Milfield Property Limited | Real estate | 2026 |
| Military Tees UK Ltd | Wholesale & retail | 2025 |
| Mill Pond Marina Ltd | Arts & recreation | 2024 |
| Millar Hutchison Management Consultants Ltd | Professional & scientific | 2008 |
| Millbrook Consultancy Limited | Information & communication | 2018 |
| Miller and Lloyd Limited | Wholesale & retail | 2008 |
| Miller Carpentry and Construction Ltd | Manufacturing | 2025 |
| Mills Heritage Limited | Real estate | 2025 |
| Milnerdale Limited | Construction | 2004 |
| Milo Mini Market Ltd | Wholesale & retail | 2025 |
| Milu Hospitality Limited | Hospitality | 2025 |
| Mincan C Flex Ltd | Transport & logistics | 2025 |
| Mindset Clinical Supervision Ltd | Health & social care | 2022 |
| Mini-Mix Worcester | | 1989 |
| Minia UK Ltd | Wholesale & retail | 2019 |
| Minifigz Framed Limited | Wholesale & retail | 2025 |
| Minnow Limited | Health & social care | 2025 |
| Mintro/Padmore Garage Limited | Other services | 1995 |
| Mintworth Transport Limited | Water & waste | 1989 |
| Mipara Tele Ltd | Health & social care | 2026 |
| Misas Properties Ltd | Real estate | 2026 |
| Miss LDA UK Limited | Professional & scientific | 2023 |
| Miss Milly Limited | Wholesale & retail | 2012 |
| Mission Accomplie Limited | Information & communication | 2024 |
| Mister & Missus Ltd | Construction | 2014 |
| Misters Bros Limited | Construction | 1993 |
| Misters Construction (1994) Limited | Construction | 1994 |
| Misters Development Limited | Construction | 2025 |
| Mitek Industries Limited | Manufacturing | 1968 |
| Mitis Accountancy Limited | Professional & scientific | 2015 |
| MJ Franklin Solid Fuel Merchants Ltd | Wholesale & retail | 2019 |
| MJ Health Ltd | Administrative & support | 2019 |
| MJ Workforce Hiring Ltd | Administrative & support | 2025 |
| Mj-Mec Limited | Professional & scientific | 2023 |
| MJA Heating Solutions Ltd | Professional & scientific | 2020 |
| MJC Digital Solutions Limited | Professional & scientific | 2025 |
| MJN Accountancy Limited | Information & communication | 2021 |
| MJN Homes Limited | Real estate | 2025 |
| MJR Professional Services Limited | Professional & scientific | 2014 |
| MJR Treeworks Ltd | Agriculture & fishing | 2026 |
| MJSGB5 Healthcare Limited | Health & social care | 2013 |
| MJW Site Management Solutions Ltd | Professional & scientific | 2020 |
| MKK Electrical Ltd | Construction | 2016 |
| ML Services (Worcestershire) Limited | Construction | 2010 |
| ML Worcester Property Solutions Ltd | Real estate | 2026 |
| MLB Contracts Limited | Construction | 2025 |
| MLG Construction Ltd | Construction | 2012 |
| MLP Newco 1 Limited | Information & communication | 2019 |
| MLW (PCO) Car Rentals Limited | Administrative & support | 2014 |
| MM Co Plant Limited | Administrative & support | 2021 |
| MM Productions Limited | Information & communication | 2021 |
| MM Shine Ltd | Administrative & support | 2018 |
| MM Square World Ltd | Hospitality | 2025 |
| Mmbre (Worcester) Ltd | Other services | 2024 |
| Mmbre Limited | Real estate | 1981 |
| Mmcd Construction Ltd | Professional & scientific | 2016 |
| MMD Engineering Solutions Ltd | Professional & scientific | 2015 |
| Mmed Ltd | Administrative & support | 2011 |
| MMM Retail Group Ltd | Wholesale & retail | 2026 |
| MN Radiology Ltd | Health & social care | 2025 |
| MNA Electrical Limited | Construction | 2023 |
| MNB Developments Limited | Administrative & support | 2013 |
| Moat Estates Ltd | Administrative & support | 2020 |
| Mobile Audio Holdings Ltd | Wholesale & retail | 2024 |
| Mobile Matrix UK Ltd | Wholesale & retail | 2025 |
| Mobile Xone (UK) Ltd | Wholesale & retail | 2015 |
| Mobilise Labs Limited | Information & communication | 2025 |
| Modern Accountancy Ltd | Professional & scientific | 2011 |
| Modern Mason Ltd | Construction | 2026 |
| Modern Self Assessments Ltd | Professional & scientific | 2026 |
| Modern Voice Limited | Information & communication | 2004 |
| Modulate Talent Ltd | Arts & recreation | 2023 |
| Modusforce Ltd | Information & communication | 2024 |
| Moful Ltd | Professional & scientific | 1992 |
| MOG Finder Limited | Information & communication | 2024 |
| Mohair (Worcester) Limited | Other services | 2005 |
| Mojitos Upton Limited | Hospitality | 2021 |
| Mole Property Holdings Limited | Financial services | 2024 |
| Molten Metal Products Limited | Manufacturing | 2010 |
| Momentum Consultancy Group Limited | Information & communication | 2016 |
| Momentum Executive Solutions Ltd | Professional & scientific | 2009 |
| Momentum EXS Limited | Financial services | 2020 |
| Monarch Lets Limited | Real estate | 2003 |
| Monce Solutions Group Ltd | Financial services | 2021 |
| Monce Solutions Property Limited | Real estate | 2021 |
| Mondex (Eastern) Ltd | Wholesale & retail | 2020 |
| Monitor DC Ltd | Professional & scientific | 2026 |
| Monjap Ltd | Other services | 2026 |
| Monk Worx Ltd | Professional & scientific | 2023 |
| Mono Web Design Ltd | Information & communication | 2018 |
| Monosoft Consultancy Limited | Information & communication | 1993 |
| Monsta Media South West Limited | Professional & scientific | 2026 |
| Monster Bird Limited | Professional & scientific | 2017 |
| Montel Civil Engineering Limited | Construction | 2014 |
| Montel Holdings Limited | Construction | 2022 |
| Montel Water Limited | Construction | 2024 |
| Monthly Cover Limited | Financial services | 2022 |
| Montie's Food Takeaway Ltd | Wholesale & retail | 2025 |