| Minnanjey IT Solutions Ltd | Information & communication | 2023 |
| Minnanjey Limited | Wholesale & retail | 2024 |
| Minnanjey Properties Limited | Real estate | 2024 |
| Minor Illnesses Consult Ltd | Health & social care | 2023 |
| Minotaur Martial Arts and Fitness (Bury ST Edmunds) Limited | Arts & recreation | 2023 |
| Mint & Mayfair Investment Limited | Financial services | 2026 |
| Mint International Limited | Professional & scientific | 2001 |
| Mintd Ltd | Information & communication | 2025 |
| Mintyselling Limited | Wholesale & retail | 2026 |
| Mira Healthcare 31 Ltd | Health & social care | 2022 |
| Mira Trans Ltd | Transport & logistics | 2020 |
| Miracle Projects Group Ltd | Hospitality | 2023 |
| Mirage Tech Ltd | Information & communication | 2024 |
| Miranda One Investments Limited | Real estate | 2023 |
| Miraverse Limited | Wholesale & retail | 2022 |
| Mirayproperty Limited | Real estate | 2026 |
| Miriam Grace Bagshot Ltd | Health & social care | 2024 |
| Miriam Grace Ltd | Health & social care | 2020 |
| Miriam Grace Wokingham Ltd | Health & social care | 2024 |
| Mirrist Ltd | Wholesale & retail | 2023 |
| Mirzanmamo Ltd | Other services | 2026 |
| Mission Ability Ltd | Public administration | 2025 |
| Missionopsai Ltd | Wholesale & retail | 2022 |
| Mistarim Holdings Ltd | Professional & scientific | 2025 |
| Mitch Services Ltd | Information & communication | 2022 |
| Mitchell Consultancy (Berkshire) Limited | Administrative & support | 2014 |
| Mithaly Limited | Hospitality | 2018 |
| Mitson Design Co Ltd | Professional & scientific | 2019 |
| Mixdar Invest Ltd | Financial services | 2022 |
| Mixed State Ltd | Extraterritorial | 2026 |
| Miyah Construction & Maintenance Ltd | Construction | 2025 |
| Miyah Property Limited | Real estate | 2025 |
| Mizems Property Ltd | Real estate | 2024 |
| Miztiquezz Clothing Line Ltd | Manufacturing | 2019 |
| MJ Cole Consultancy Ltd | Professional & scientific | 2026 |
| MJ Consultancy Ltd | Professional & scientific | 2025 |
| MJ Goods Ltd | Wholesale & retail | 2016 |
| MJ Groundwork Services Ltd | Construction | 2016 |
| MJ Tech and DEV Ltd | Real estate | 2023 |
| MJ Trading Group Ltd | Wholesale & retail | 2025 |
| MJB Consulting Group Ltd | Health & social care | 2019 |
| Mjcateringconsultants Ltd | Professional & scientific | 2024 |
| MJE Facilities Consultancy Ltd | Administrative & support | 2025 |
| MJI Investments Ltd | Real estate | 2025 |
| MJK Building Contractors Ltd | Construction | 2019 |
| MJL Building Services [Inc] Limited | Construction | 2011 |
| MJL Osteopathy Ltd | Health & social care | 2026 |
| MJP Transport Ltd | Transport & logistics | 2022 |
| Mjrelocations Limited | Transport & logistics | 2020 |
| MJS Asset Holdings Ltd | Real estate | 2025 |
| Mjsr Properties Ltd | Real estate | 2025 |
| MJW Sustain Limited | Agriculture & fishing | 2020 |
| MK Data Consultancy Limited | Information & communication | 2023 |
| MK Events & Social Limited | Professional & scientific | 2020 |
| MK Health Ltd | Health & social care | 2010 |
| MK Lovell Coaching Ltd | Professional & scientific | 2023 |
| MK Lovell Properties Ltd | Real estate | 2021 |
| MK Marta Ltd | Professional & scientific | 2017 |
| MKB Controls Ltd | Professional & scientific | 2013 |
| Mkcb Couriers Limited | Transport & logistics | 2025 |
| Mkjc Limited | Information & communication | 2020 |
| Mkkr Ltd | Financial services | 2022 |
| MKN Productions Limited | Information & communication | 2024 |
| Mkson Basketball CIC | Arts & recreation | 2023 |
| Mktranquility Ltd | Other services | 2024 |
| Mktutoring Ltd | Education | 2022 |
| Mkuze Limited | Professional & scientific | 2025 |
| ML Building Contractors Ltd | Construction | 2022 |
| ML Pirate Ltd | Transport & logistics | 2022 |
| ML Serv Limited | Transport & logistics | 2026 |
| Ml&K Consulting Ltd | Professional & scientific | 2024 |
| MLB Dentysta Limited | Health & social care | 2011 |
| MLC Cleaning Ltd | Administrative & support | 2026 |
| MLE Consulting Services Ltd | Construction | 2025 |
| MMA Capital Ltd | Wholesale & retail | 2025 |
| MMB Investments 2 Limited | Real estate | 2021 |
| MMB Investments Limited | Real estate | 2016 |
| MMD Property Group Investment Ltd | Real estate | 2025 |
| MMG Labs Ltd | Information & communication | 2026 |
| MMI Online Ltd | Information & communication | 2026 |
| MML Cars Ltd | Wholesale & retail | 2025 |
| MML Home Improvements Ltd | Construction | 2024 |
| MMT Aesthetics Ltd | Other services | 2019 |
| MMT Transport Ltd | Transport & logistics | 2020 |
| Mmtu Property Ltd | Real estate | 2025 |
| Mn&M Limited | Information & communication | 2025 |
| Mnjw Group Limited | Wholesale & retail | 2022 |
| MNM Care Limited | Health & social care | 2017 |
| MNY Driving Ltd | Education | 2025 |
| Mo's Buses Limited | Transport & logistics | 2019 |
| Mobbs Optical Services Ltd | Professional & scientific | 2025 |
| Mobike Technology UK Limited | Administrative & support | 2017 |
| Mobile Concrete Supplies Ltd | Manufacturing | 2020 |
| Mobile Gaming Investment Ltd | Information & communication | 2016 |
| Mochi Cool Ltd | Professional & scientific | 2023 |
| Mochii Ltd | Administrative & support | 2024 |
| MOD Fashion Tailor Ltd | Wholesale & retail | 2024 |
| Mode Capital Ltd | Construction | 2023 |
| Modern AL Huwaira Ltd | Construction | 2025 |
| Modern Classic World Ltd | Wholesale & retail | 2025 |