| ML Vape Station Cafe Ltd | Wholesale & retail | 2025 |
| ML Vapes Ltd | Wholesale & retail | 2023 |
| ML Yachting LLP | | 2024 |
| ML7 Services Ltd | Wholesale & retail | 2018 |
| MLA Mart Ltd | Wholesale & retail | 2025 |
| MLD Socials Ltd | Information & communication | 2025 |
| MLG Partners Ltd | Other services | 2011 |
| MLH Material Company Limited | Manufacturing | 2021 |
| MLJ Cleaning Ltd | Administrative & support | 2019 |
| MLK Cleaning Limited | Administrative & support | 2021 |
| MLK Maintenance Ltd | Administrative & support | 2025 |
| Mlkd Ltd | Financial services | 2021 |
| Mllew Promotions Limited | Arts & recreation | 2024 |
| MLM Compliance Ltd | Professional & scientific | 2014 |
| MLM UK Properties Limited | Real estate | 2021 |
| MLN Projects Ltd | Professional & scientific | 2014 |
| Mlodigitalservices Limited | Other services | 2022 |
| MLP Consulting Limited | Professional & scientific | 2008 |
| MLP Industries Ltd | Wholesale & retail | 2022 |
| MLR Plumbing Limited | Construction | 2025 |
| MLT Delivery Services Limited | Transport & logistics | 2018 |
| MLW Electrical Solutions Ltd | Construction | 2025 |
| MLW Paper Products Ltd | Information & communication | 2019 |
| MM Aero Ltd | Professional & scientific | 2017 |
| MM Autogroup Ltd | Wholesale & retail | 2025 |
| MM Ehealthcare Limited | Other services | 2015 |
| MM Future Limited | Real estate | 2021 |
| MM GAS & Heating Ltd | Construction | 2024 |
| MM Housekeeping Ltd | Administrative & support | 2020 |
| MM Investments (UK) Ltd | Extraterritorial | 2014 |
| MM London Limited | Administrative & support | 2014 |
| MM Merchant Ltd | Wholesale & retail | 2025 |
| MM Retail Ltd | Wholesale & retail | 2025 |
| Mm&M (PVT) Limited | Wholesale & retail | 2021 |
| MMA Vape Nation Ltd | Wholesale & retail | 2024 |
| MMB Consultancy Ltd | Professional & scientific | 2014 |
| MMB Couriers Ltd | Transport & logistics | 2015 |
| MMC Site Services Ltd. | Administrative & support | 2013 |
| MMD Solutions Ltd | Information & communication | 2026 |
| MMD Surg Ltd | Health & social care | 2022 |
| MME Transport Services Ltd | Transport & logistics | 2016 |
| Mmecorp Ltd | Wholesale & retail | 2025 |
| MMG Direct Limited | Administrative & support | 2018 |
| MMG Talent Limited | Information & communication | 2019 |
| Mmhs Solutions Limited | Health & social care | 2016 |
| MMI Group Ltd | Wholesale & retail | 2017 |
| MMK Mechanical Ltd | Construction | 2020 |
| Mmlp Limited | Hospitality | 2019 |
| MMM Flooring Limited | Construction | 2019 |
| MMM Global Developers Ltd | Professional & scientific | 2025 |
| Mmoreross Ltd | Wholesale & retail | 2025 |
| Mmpl Services Ltd | Information & communication | 2024 |
| MMR Infinity Ltd | Wholesale & retail | 2025 |
| MMR Social Care Limited | Health & social care | 2013 |
| Mmrit Limited | Information & communication | 1988 |
| MMS Hair Experts (Cardiff) Ltd | Other services | 2022 |
| Mmsr Group Ltd | Administrative & support | 2019 |
| MMU Tech Ltd | Wholesale & retail | 2025 |
| MMY Marketing and International Trading Limited | Hospitality | 2013 |
| MMZ Global Ltd | Other services | 2018 |
| MN Propco Ltd | Real estate | 2020 |
| MNB Global Ltd | Hospitality | 2018 |
| MNE Global Ltd | Wholesale & retail | 2024 |
| Mnena Lupus Foundation | Education | 2019 |
| Mnfst Advertising Solutions LLP | | 2017 |
| MNG Construction Ltd | Households | 2024 |
| Mnma Limited | Health & social care | 2018 |
| Mnmrfashion Ltd | Wholesale & retail | 2025 |
| MNR Defence Consultancy Limited | Administrative & support | 2016 |
| MNR Property Limited | Real estate | 2025 |
| MNS Retail Interiors Limited | Construction | 2018 |
| MO Events & Co Ltd | Hospitality | 2022 |
| MO Shop Ltd | Wholesale & retail | 2025 |
| MO Store Limited | Wholesale & retail | 2024 |
| MO Vital Care Ltd | Health & social care | 2026 |
| Mo's Homes Limited | Real estate | 2022 |
| Moabbah Ltd | Wholesale & retail | 2025 |
| Moaden Accounting Ltd | Professional & scientific | 2017 |
| Moahmed a Sayed Ltd | Wholesale & retail | 2025 |
| Moannaa Ltd | Financial services | 2025 |
| Moarab Ltd | Hospitality | 2020 |
| Moat House Investments Sutton Coldfield Limited | Real estate | 2019 |
| Moat Project Management Limited | Professional & scientific | 2017 |
| Moazzam Javed Ltd | Health & social care | 2026 |
| Mobec Pharmacy Limited | Wholesale & retail | 2006 |
| Mobi Mart Ltd | Wholesale & retail | 2025 |
| Mobi TEC Mobile Mechanics Ltd | Wholesale & retail | 2024 |
| Mobi TEC Services Ltd | Wholesale & retail | 2017 |
| Mobile Auto Shine Ltd | Wholesale & retail | 2010 |
| Mobile Cases Ltd | Wholesale & retail | 2019 |
| Mobile Concept Solutions Ltd | Information & communication | 2020 |
| Mobile Fades Ltd | Other services | 2025 |
| Mobile Model Limited | Wholesale & retail | 2023 |
| Mobile Solutions Cardiff Ltd | Wholesale & retail | 2015 |
| MOBILETYRES4U Ltd | Wholesale & retail | 2017 |
| Mobility Network Ltd | Households | 2013 |
| Mobinnect Telecom Limited | Information & communication | 2025 |
| Mobis Transport Limited | Transport & logistics | 2015 |
| Mobiskip Ltd | Water & waste | 2020 |
| Mobius Resourcing Limited | Administrative & support | 2010 |