| MS Car Bedford Ltd | Wholesale & retail | 2025 |
| Ms-Recruitment Limited | Administrative & support | 2015 |
| MSB Property Limited | Real estate | 2017 |
| MSB Timber and Groundwork Limited | Administrative & support | 2019 |
| MSC Life Ltd | Financial services | 2020 |
| Msdm Ltd | Real estate | 2024 |
| MSE Investments Ltd | Real estate | 2021 |
| MSG Carpentry Ltd | Construction | 2021 |
| MSG Consulting Limited | Professional & scientific | 2019 |
| MSI Recruitment Limited | Administrative & support | 2025 |
| Msi-Moving Specialists INT. Ltd | Transport & logistics | 2011 |
| MSJ Group Services Limited | Wholesale & retail | 2017 |
| Msjl Holdings Ltd | Hospitality | 2025 |
| Mslvr Ltd | Construction | 2019 |
| Msnd Property Investments Ltd | Real estate | 2025 |
| Msokolovs Limited | Transport & logistics | 2023 |
| MST Painting and Decorations Ltd | Construction | 2023 |
| MTD Finance Limited | Professional & scientific | 2014 |
| MTD Packaging Ltd | Wholesale & retail | 2026 |
| Mtek-Bed Ltd | Other services | 2024 |
| MTJ Autos Ltd | Wholesale & retail | 2024 |
| MTR Engineering Ltd | Professional & scientific | 2023 |
| MTS Consulting Ltd | Information & communication | 2026 |
| MTX Consultancy Ltd | Professional & scientific | 2026 |
| MU Arms Ltd | Hospitality | 2021 |
| MU Bags Limited | Wholesale & retail | 2010 |
| Muaythai-Boxing Limited | Wholesale & retail | 2004 |
| Mucky Boots Ltd | Real estate | 2026 |
| MUD Lane Properties Limited | Real estate | 2018 |
| Muddy Tyres 4X4 Limited | Administrative & support | 2024 |
| Mug.Up Language Studio Ltd | Education | 2025 |
| Mughal Boutique Limited | Wholesale & retail | 2019 |
| Mugoli Ndusha Limited | Extraterritorial | 2024 |
| Mugurel Neagu Limited | Transport & logistics | 2024 |
| Mugwe Limited | Administrative & support | 2014 |
| Muhammad Shaheer Bhatti Ltd | Wholesale & retail | 2025 |
| Mulberrybush.Pub Ltd | Hospitality | 2024 |
| Mule Holdings Limited | Financial services | 2025 |
| Mule Limited | Professional & scientific | 2013 |
| Mulla Pain Solutions Ltd | Health & social care | 2019 |
| Mullane Services Group Ltd | Construction | 2025 |
| Mullen Electrical Services Limited | Construction | 1995 |
| Mullen Holdings Limited | Financial services | 2003 |
| Mullins Investments Limited | Real estate | 2025 |
| Multi Hats Limited | Financial services | 2018 |
| Multi-Global Limited | Health & social care | 2012 |
| Multico Limited | Wholesale & retail | 2019 |
| Multiple Success Properties Ltd | Hospitality | 2021 |
| Multiply Consultancy Ltd | Professional & scientific | 2026 |
| Multirole Limited | Professional & scientific | 2006 |
| Multitex Trading Limited | Construction | 2020 |
| Mums Heritage Limited | Manufacturing | 2025 |
| Mums Work From Home Ltd | Administrative & support | 2023 |
| Munaf 1 Ltd | Wholesale & retail | 2023 |
| Mungovan Aviation Services Ltd | Manufacturing | 2023 |
| Municipal Management Limited | Households | 1990 |
| Muniek Ltd | Wholesale & retail | 2024 |
| Munnelly London Limited | Construction | 2014 |
| Munns Allen Limited | Financial services | 2011 |
| Munro Glen Limited | Real estate | 2025 |
| Munters Limited | Manufacturing | 2010 |
| Munyard Enterprises Ltd. | Information & communication | 2013 |
| Muqi Ltd | Hospitality | 2025 |
| Murform Limited | Construction | 2007 |
| Murima UK Community CIC | Education | 2025 |
| Murphy and Holland Limited | Construction | 2001 |
| Murray Computer Services Ltd | Information & communication | 2008 |
| Murrers Motors Ltd | Wholesale & retail | 2019 |
| Musea Studio Ltd | Wholesale & retail | 2024 |
| Mushak Vets Ltd | Professional & scientific | 2020 |
| Music Connection Limited | Wholesale & retail | 2015 |
| Music Through the Bars Ltd | Arts & recreation | 2021 |
| Musical Seeds Ltd | Education | 2021 |
| Muskett Flooring Limited | Other services | 2004 |
| Mutex Apps Ltd | Information & communication | 2021 |
| Muthu IT Limited | Information & communication | 2020 |
| MV021 Trading Ltd | Transport & logistics | 2022 |
| Mvbp Limited | Real estate | 2010 |
| MVP Clothing Ltd | Manufacturing | 2021 |
| Mvsa Ltd | Wholesale & retail | 2020 |
| MVW Property Management Limited | Real estate | 2025 |
| MW Early Years Training & Support Services Ltd | Administrative & support | 2023 |
| MW Power Solutions Ltd | Construction | 2026 |
| Mweke Engineering Services Limited | Wholesale & retail | 2018 |
| MWM Plastering & DRY Lining Ltd | Construction | 2013 |
| MWM Rendering Ltd | Construction | 2025 |
| MWR Creatives Ltd | Other services | 2023 |
| My Bark Bundle Ltd | Wholesale & retail | 2024 |
| My Car Recovery Bedford Ltd | Transport & logistics | 2025 |
| My Character Limited | Extraterritorial | 2021 |
| My Claims Advocate Limited | Financial services | 2025 |
| My Coach Training Ltd. | Education | 2012 |
| My Crown Hair Ltd | Wholesale & retail | 2024 |
| My Executive Office Limited | Administrative & support | 2021 |
| My Function 1ST Ltd | Public administration | 2023 |
| My Gym Space Services Ltd | Professional & scientific | 2026 |
| My Know Properties Ltd | Real estate | 2023 |
| My Little Role Play Ltd | Wholesale & retail | 2025 |
| My Nestings Limited | Real estate | 2018 |
| My Nurse Ltd. | Health & social care | 2013 |