| MNC Capital Ltd | Professional & scientific | 2025 |
| MNK Holdings Ltd | Professional & scientific | 2019 |
| MNM Auto Services Ltd | Wholesale & retail | 2024 |
| MNY56 Limited | Real estate | 2025 |
| Moalns Ltd | Health & social care | 2021 |
| Moann Limited | Health & social care | 2019 |
| Mobile Bars Yorkshire Ltd | Hospitality | 2020 |
| Mobile Dapper House Limited | Other services | 2025 |
| Mobile Dual Controls Limited | Wholesale & retail | 2023 |
| Mobile Outlet Ltd | Wholesale & retail | 2018 |
| Mobile Paint Solutions Ltd | Wholesale & retail | 2009 |
| Mobile Sheen Ltd | Administrative & support | 2018 |
| Mobiles 4 U Wakefield Ltd | Wholesale & retail | 2019 |
| Moccha Cafe B.S.M. Ltd | Hospitality | 2019 |
| Modena Developments Limited | Real estate | 2017 |
| Modern Martial Arts Limited | Extraterritorial | 2012 |
| Modesta UK Limited | Construction | 2016 |
| Modus I.T. Ltd | Information & communication | 2006 |
| MOF (UK) Limited | Health & social care | 2014 |
| Mohammed & Musa Ltd | Other services | 2026 |
| Mohammed Almosaiwi Limited | Health & social care | 2023 |
| Mojo Films C.I.C. | Information & communication | 2014 |
| Mollexhar Limited | Information & communication | 2021 |
| Momentum Care and Support (Yorkshire) Limited | Health & social care | 2009 |
| Monarch Interior Designs Ltd | | 1991 |
| Monarch Smart Repairs Ltd | Wholesale & retail | 2025 |
| Monarch Vans Ltd | Wholesale & retail | 2023 |
| Mondie Limited | Construction | 2018 |
| Monixstylist Ltd | Other services | 2022 |
| Monkey Bars Group Ltd | Hospitality | 2024 |
| Monkey Enterprises Limited | Real estate | 2004 |
| Montbleur Ltd | Wholesale & retail | 2018 |
| MOO Hospitality Limited | Hospitality | 2025 |
| Mood Colour Limited | Construction | 2021 |
| Mood Rent Ltd | Transport & logistics | 2025 |
| Moolyn Limited | Extraterritorial | 2014 |
| Moonch Ltd | Information & communication | 2022 |
| Moonshot Golf Ltd | Arts & recreation | 2023 |
| Moonspring AI Ltd | Information & communication | 2026 |
| Moonstar Holdings Ltd | Real estate | 2014 |
| Moonstone Vince Property Limited | Real estate | 2025 |
| Moor Knoll Developments Limited | Extraterritorial | 1989 |
| Moorhouse Retail Ltd | Wholesale & retail | 2025 |
| Moortay Holdings Limited | Financial services | 2022 |
| Moorwell Holdings Ltd | Real estate | 2023 |
| Morail UK Ltd | Professional & scientific | 2011 |
| Moran Electrical Yorkshire Limited | Construction | 2025 |
| More Flow Limited | Professional & scientific | 2015 |
| Moreli Design Studio Ltd | Professional & scientific | 2025 |
| Morgan Electrical Ltd | Construction | 2025 |
| Morgan Manufacturing Innovation Limited | Professional & scientific | 2024 |
| Morgenschweis Ltd | Real estate | 2013 |
| Morley and District PCN Limited | Health & social care | 2020 |
| Morphologic Ltd | Information & communication | 2014 |
| Morris Electrical Services Ltd | Professional & scientific | 2023 |
| Morris Housing Group Ltd | Real estate | 2022 |
| Mors Logistics Ltd | Transport & logistics | 2025 |
| Morse Exchanges Limited | Extraterritorial | 2014 |
| Mortgage Gateway Ltd | Financial services | 2023 |
| Morton Collins Brewing Company Ltd | Manufacturing | 2015 |
| Morton Collins Trading Company Ltd | Hospitality | 2017 |
| MOS Aggregates and Excavations Limited | Transport & logistics | 2020 |
| Moss Fleet Services Ltd | Wholesale & retail | 2024 |
| Most UK Limited | Professional & scientific | 2004 |
| Motech Wakefield Ltd | Wholesale & retail | 2025 |
| Motion JIU Jitsu Ltd | Wholesale & retail | 2025 |
| Motor Bros Ltd | Wholesale & retail | 2025 |
| Motorgold Limited | Transport & logistics | 1991 |
| Motorhome Supplies Ltd | Wholesale & retail | 2023 |
| Motorix Limited | Wholesale & retail | 2026 |
| Motors 4 ALL Ltd | Wholesale & retail | 2024 |
| Motueka Homes Ltd | Real estate | 2019 |
| Mouldy Toof Studios Limited | Extraterritorial | 2014 |
| Mount Tabor Shaw Cross Community Church | Other services | 2008 |
| Mount Vernon Place Management Company Limited | Households | 2021 |
| Mount Zion Global Ministries Ltd | Other services | 2017 |
| Mountbatten Travel Limited | Transport & logistics | 2025 |
| Mountco Developments Limited | Real estate | 2006 |
| Mountco Investments (Wakefield) Limited | Real estate | 2015 |
| Mountco Investments Limited | Real estate | 2009 |
| Mousesports Limited | Administrative & support | 2007 |
| Move Ahead (Wakefield) Limited | Other services | 2007 |
| Move Housing (Wakefield) Limited | Real estate | 2017 |
| Move in Ready Ltd | Real estate | 2025 |
| Movenowproperties.Com Limited | Real estate | 2010 |
| MPJ Autos Limited | Wholesale & retail | 2026 |
| MPJ Global Ltd | Financial services | 2024 |
| MPL (Yorkshire) Ltd | Administrative & support | 2017 |
| MPL Locksmiths (Training) Ltd | Administrative & support | 2017 |
| MPS Medienverlag Ltd | Information & communication | 2008 |
| MPT Electrical Contractors Ltd | Construction | 2023 |
| MR & MRS Clean Ltd | Administrative & support | 2026 |
| MR & MRS Hossain LLP | | 2011 |
| MR Clean Cleaning & Property Services Ltd | Administrative & support | 2011 |
| MR Electronics Ltd. | Manufacturing | 2013 |
| MR Fries Ardwick Ltd | Hospitality | 2024 |
| MR Green Horbury Limited | Wholesale & retail | 2025 |
| MR Pat's Wakefield Limited | Hospitality | 2022 |
| MR T Does Primary History Ltd | Education | 2022 |
| Mr-Physiques Ltd | Education | 2021 |