| Minaz Freight Ltd | Transport & logistics | 2025 |
| Mindfulness Meditation and Conscious Breathing Ltd | Other services | 2023 |
| Mini Travel Services Ltd | Transport & logistics | 2019 |
| Mirab Fashion and Tailoring Ltd | Wholesale & retail | 2026 |
| Miracle Continental Ltd | Hospitality | 2019 |
| Miracle International Services Ltd | Transport & logistics | 2017 |
| Mirasure Services Ltd | Professional & scientific | 2018 |
| Mirdha London Limited | Administrative & support | 2024 |
| Miristan Ltd | Construction | 2015 |
| Mirobolant Ltd | Construction | 2024 |
| Miroma Limited | Information & communication | 2017 |
| Mirza Taekwondo Club Ltd | Arts & recreation | 2025 |
| Mirza Taekwondo Community CIC | Education | 2025 |
| Misalpaav Limited | Hospitality | 2025 |
| Mise N Ltd | Wholesale & retail | 2017 |
| Mishal's Cafe Limited | Real estate | 2024 |
| Mishri Ltd | Professional & scientific | 2021 |
| Misiun Services Ltd | Construction | 2026 |
| Misrat Holding Ltd | Other services | 2020 |
| Miss Jenesequa Ltd | Wholesale & retail | 2021 |
| Mistik IT Ltd | Information & communication | 2023 |
| MIT Carpentry Ltd | Construction | 2018 |
| Mitu Construction Ltd | Construction | 2025 |
| Mixologya Ltd | Information & communication | 2024 |
| Miya Bhai's Ltd | Wholesale & retail | 2023 |
| Mizu Studio Limited | Arts & recreation | 2025 |
| MJ One Retail Ltd | Wholesale & retail | 2026 |
| Mjiservices Limited | Transport & logistics | 2020 |
| Mjuk Properties Ltd | Construction | 2024 |
| MJV Express Logistics Ltd | Transport & logistics | 2020 |
| MK 1 Building Contractors Limited | Construction | 2005 |
| MK Enterprise Group Ltd | Wholesale & retail | 2023 |
| MK Facilities Ltd | Transport & logistics | 2012 |
| MK Grand Interiors Ltd | Construction | 2019 |
| MK Legal Solutions Ltd | Professional & scientific | 2025 |
| MK Maintenance Services Limited | Construction | 2021 |
| MK Promotions London Ltd | Information & communication | 2020 |
| MK Techno Limited | Information & communication | 2025 |
| MK Travels UK Co Ltd | Administrative & support | 2010 |
| MKGB25 Ltd | Manufacturing | 2025 |
| MKH Management Services Ltd | Administrative & support | 2025 |
| MKH Services Limited | Wholesale & retail | 2024 |
| MKH1 Productions Limited | Information & communication | 2022 |
| MKI Global Ltd | Households | 2025 |
| MKM Exteriors Limited | Administrative & support | 2026 |
| MKM Global Ltd | Wholesale & retail | 2019 |
| MKM Miernik Property Ltd | Real estate | 2024 |
| MM & FF Properties Limited | Real estate | 2024 |
| MM Events Design Ltd | Extraterritorial | 2015 |
| MM Laica Ltd | Construction | 2021 |
| MM Properties Management UK Ltd | Construction | 2024 |
| MM Servicing Centre Ltd | Wholesale & retail | 2024 |
| MM Store Online Ltd | Wholesale & retail | 2025 |
| MMA Gear Ltd | Administrative & support | 2020 |
| Mmasichi Enterprises Ltd | Administrative & support | 2019 |
| MMB Builders Limited | Construction | 2025 |
| MMB Constructions Ltd | Construction | 2025 |
| MMC Foods Limited | Wholesale & retail | 2018 |
| MMC Infinity Care Services Limited | Health & social care | 2022 |
| Mmibtl Ltd | Real estate | 2024 |
| MMJ Online Ltd | Wholesale & retail | 2015 |
| MMJ Tech Plus Ltd | Wholesale & retail | 2026 |
| MMM Cavendish Group Ltd | Information & communication | 2026 |
| MMR Couriers Ltd | Transport & logistics | 2025 |
| MMS Holdings Ltd | Financial services | 2022 |
| MMY Services Ltd | Construction | 2020 |
| MNK IT Consultancy Limited | Information & communication | 2009 |
| MNM Home Investment Limited | Real estate | 2026 |
| MNU Services Ltd | Professional & scientific | 2018 |
| MOB Tech Limited | Wholesale & retail | 2023 |
| Mobile Care Centre Limited | Other services | 2014 |
| Mobile City for UK Limited | Other services | 2021 |
| Mobile Quick FIX Ltd | Wholesale & retail | 2020 |
| Mobkhan Limited | Professional & scientific | 2023 |
| Mocanu Vale Limited | Transport & logistics | 2015 |
| Moctar Ltd | Transport & logistics | 2015 |
| MOD Furnishings Wholesale UK Ltd. | Wholesale & retail | 2017 |
| Model Care UK Ltd | Administrative & support | 2021 |
| Modern Legacy Real Estate Ltd | Real estate | 2026 |
| Modern Living Property Investment Limited | Real estate | 2024 |
| Modern Trading Ltd | Professional & scientific | 2016 |
| Modhur Canteen Ltd | Hospitality | 2026 |
| Mohammed Islam Limited | Professional & scientific | 2014 |
| Mollah Limited | Wholesale & retail | 2025 |
| Momin Motors Ltd | Wholesale & retail | 2024 |
| Monaco Motor Group Limited | Manufacturing | 2019 |
| Monega West Ltd | Wholesale & retail | 2024 |
| Money Messenger Ltd | Financial services | 2021 |
| Monnasjossy Services Limited | Health & social care | 2014 |
| Monvigo Ltd | Construction | 2024 |
| Moon & Star Properties Ltd | Real estate | 2024 |
| Moon Driving School Ltd | Extraterritorial | 2023 |
| Mooncare Limited | Health & social care | 2001 |
| Moonlight Magnets Ltd | Professional & scientific | 2025 |
| Moonlight Maintenance Limited | Construction | 2019 |
| Moonstar London Ltd | Administrative & support | 2017 |
| Moonstar London Properties Ltd | Real estate | 2024 |
| Moozak 3 Ltd | Hospitality | 2025 |
| Moozak Ltd | Hospitality | 2023 |
| Morden Tech Security Ltd | Other services | 2018 |