| Mina Living Ltd | Real estate | 2025 |
| Mindful Equity Consultancy Ltd | Professional & scientific | 2025 |
| Mindful Equity UK CIC | Education | 2020 |
| Mine Hydro Ltd | Professional & scientific | 2023 |
| Mingchen IMP and EXP Co., Ltd | Manufacturing | 2020 |
| Mingtai Aluminum Group Co., Ltd | Manufacturing | 2023 |
| Mingzhu Steel Co., Ltd | Manufacturing | 2023 |
| Mini Fashion Accessory Ltd | Wholesale & retail | 2026 |
| Mini Riders Ltd | Health & social care | 2022 |
| Minics Retail Ltd | Wholesale & retail | 2026 |
| Minimise Services Limited | Real estate | 2019 |
| Mintaka Enterprises Limited | Professional & scientific | 2005 |
| Minye Enterprise Limited | Wholesale & retail | 2023 |
| MIR Transport Ltd | Transport & logistics | 2025 |
| Miramira Beauty Limited | Administrative & support | 2013 |
| Miranda Industry Co., Ltd | Wholesale & retail | 2024 |
| Miranter International Sourcing Agency Limited | Wholesale & retail | 2018 |
| Mirha Commerce Ltd | Wholesale & retail | 2024 |
| Mirn Ltd | Transport & logistics | 2021 |
| Miroglu Properties Limited | Real estate | 2018 |
| MIS (UK) Limited | Hospitality | 2009 |
| Miseon Trading Co., Limited | Wholesale & retail | 2024 |
| Miskins Mechanical Solutions Ltd | Manufacturing | 2024 |
| Mission Cleaning Supplies Ltd | Wholesale & retail | 2024 |
| Mission Cleaning Training & Consultancy Ltd | Professional & scientific | 2024 |
| Mistura Consultancy Services Limited | Public administration | 2004 |
| Mitchenall Brothers Limited | Extraterritorial | 2010 |
| Mivan 2019 Ltd | Real estate | 2019 |
| Mixall Limited | Manufacturing | 2020 |
| MJ Cade Ltd | Wholesale & retail | 2024 |
| MJ Williams Carpentry Ltd | Construction | 2020 |
| Mjbl Property Ltd | Real estate | 2021 |
| MJR Scaffolding Services Ltd | Construction | 2015 |
| MKC Aspire Limited | Manufacturing | 2012 |
| MKC Training Services Limited | Education | 2008 |
| MLK Property Limited | Real estate | 2024 |
| Mmaudo Consulting Limited | Professional & scientific | 2025 |
| Mmrehab Ltd | Health & social care | 2022 |
| MN Pharmx Ltd | Professional & scientific | 2025 |
| MNE International Ltd | Wholesale & retail | 2024 |
| MNR Foods Limited | Hospitality | 2024 |
| MNS Mart Ltd | Wholesale & retail | 2025 |
| Mobile Remaps Limited | Wholesale & retail | 2017 |
| Mode Nine Creative Limited | Information & communication | 2015 |
| Model 2 Metal Ltd | Professional & scientific | 2022 |
| Model Childcare Service Ltd | Health & social care | 2020 |
| Modus One Construction Ltd | Construction | 2022 |
| Moish International Ltd | Wholesale & retail | 2025 |
| Moisture and Carbon Solutions Ltd | Construction | 2012 |
| Mojan CIC | Other services | 2024 |
| Moli Star (HK) Limited | Wholesale & retail | 2021 |
| Molizur Gringing Media Co., Limited | Manufacturing | 2024 |
| Molly Fashion Ltd | Wholesale & retail | 2023 |
| Molto Forte Ltd | Real estate | 2025 |
| Moments (Dorset) Ltd | Wholesale & retail | 2024 |
| Momo MEW Limited | Wholesale & retail | 2025 |
| Money 4 Business Ltd | Financial services | 2008 |
| Monique Lewis Ltd | Other services | 2014 |
| Monix Adventures Limited | Administrative & support | 2011 |
| Monkeybag Ltd | Professional & scientific | 2011 |
| Monolith Security Ltd | Administrative & support | 2023 |
| Montague Parr Limited | Administrative & support | 2003 |
| Monti Property Investment Ltd | Real estate | 2026 |
| Moonykate Music Ltd | Manufacturing | 2019 |
| Moorhill Farming Company Limited | Agriculture & fishing | 2023 |
| Moosh Auto Salvage UK Ltd | Health & social care | 2020 |
| Moppet Cleaning and Care Ltd | Administrative & support | 2021 |
| Mopsy Cakes and Events Limited | Extraterritorial | 2014 |
| Morgan Thew Estates Limited | Real estate | 2026 |
| Moribus Ventures Ltd | Financial services | 2024 |
| Morning Sun Consultancy Limited | Information & communication | 2023 |
| Mosb Limited | Health & social care | 2023 |
| Moskko Limited | Hospitality | 2004 |
| Motack Solutions Limited | Transport & logistics | 2024 |
| Motorby Ltd | Wholesale & retail | 2023 |
| Motspur Limited | Wholesale & retail | 2018 |
| MOW & Grow Hempstead Limited | Administrative & support | 2010 |
| Moxie Properties Limited | Real estate | 2021 |
| Mozeez Ltd | Construction | 2026 |
| MPD Logistic Ltd | Transport & logistics | 2015 |
| MPF Stables Ltd | Agriculture & fishing | 2016 |
| MR BUL Ltd | Professional & scientific | 2025 |
| MR Masterchef Ltd | Hospitality | 2025 |
| MR Motor Parts Limited | Wholesale & retail | 2012 |
| MR S Neenan Ltd | Construction | 2026 |
| MRS Farley's Tuition Ltd | Education | 2025 |
| Mrs.P.Properties Ltd | Real estate | 2018 |
| MSA Cleaning Limited | Administrative & support | 2024 |
| MSA Insulation Ltd | Construction | 2019 |
| MSM Utilities Ltd | Construction | 2019 |
| MSO Analytics Ltd | Other services | 2009 |
| MSO Digital Limited | Information & communication | 2018 |
| Msta Transport Solutions Limited | Transport & logistics | 2015 |
| Mt-Prestige Ltd | Transport & logistics | 2016 |
| MTS Projects Ltd | Construction | 2014 |
| Mughal Enterprizes Ltd | Financial services | 2025 |
| Muhao Garments Co., Limited | Manufacturing | 2023 |
| Mukalazi Civil Engineering Consultancy Limited | Professional & scientific | 2014 |
| Multi Plastering Limited | Construction | 2023 |
| Multi Trade Masters Limited | Construction | 2023 |