| Merivo Commerce Ltd | Manufacturing | 2025 |
| Merkansas Vaughn Ltd | Wholesale & retail | 2025 |
| Merl Services Ltd | Professional & scientific | 2022 |
| Merlox Ltd | Wholesale & retail | 2025 |
| Mertonne Ltd | Construction | 2026 |
| Meryem Shop Ltd | Wholesale & retail | 2025 |
| Meryvia Ltd | Wholesale & retail | 2025 |
| Mescort Smart Home Co., Ltd. | Manufacturing | 2025 |
| Mesdemarchesjuridique Juris Ltd | Professional & scientific | 2024 |
| Mesm Nest Ltd | Hospitality | 2025 |
| Meta Puff Co., Ltd | Extraterritorial | 2022 |
| Meta Sandbox Ltd | Information & communication | 2022 |
| METAAND3BLK Co., Ltd | Administrative & support | 2025 |
| Metafix Solutions Ltd | Manufacturing | 2025 |
| Metalworld ( U.K ) Ltd | Wholesale & retail | 2018 |
| Metarena Technologies Ltd. | Information & communication | 2025 |
| Meteor Media Ltd | Information & communication | 2025 |
| Meter Point Services Ltd | Administrative & support | 2020 |
| Metis House Ltd | Information & communication | 2026 |
| Metrik Moves Ltd | Transport & logistics | 2024 |
| Metropol Ltd | Information & communication | 2025 |
| Mevosele Valve Technology Ltd | Manufacturing | 2026 |
| Mexican Style Ltd | Arts & recreation | 2021 |
| Mexxy Group Limited | Construction | 2026 |
| Meziane Ltd | Health & social care | 2022 |
| Mezini Group Ltd | Wholesale & retail | 2025 |
| MFD Labs Ltd | Information & communication | 2018 |
| MFL Entertainment Limited | Arts & recreation | 2019 |
| Mfor Studio Ltd | Information & communication | 2025 |
| Mgnit Gaming Ltd | Manufacturing | 2023 |
| MGR Tech. Corp. Limited | Extraterritorial | 2016 |
| MH Aureum London Ltd | Wholesale & retail | 2025 |
| MH Outlet Limited | Wholesale & retail | 2025 |
| MH Pet Products Co., Ltd | Administrative & support | 2023 |
| MH Professional Electrical Engineering Ltd | Construction | 2022 |
| MH World Deals Limited | Wholesale & retail | 2025 |
| MHJ Prestige Transport Ltd | Transport & logistics | 2025 |
| Mhpinueng Ltd | Wholesale & retail | 2025 |
| MI Casa Properties Ltd | Real estate | 2026 |
| MIA Beauty Limited | Wholesale & retail | 2006 |
| MIA Partnership LLP | | 2025 |
| MIA Strong Ltd | Wholesale & retail | 2021 |
| Miahevent Planners Ltd | Professional & scientific | 2013 |
| Miami Vending Treatz Ltd | Wholesale & retail | 2024 |
| Mian SA Traders Limited | Wholesale & retail | 2026 |
| Miaoxiuw Ltd | Wholesale & retail | 2022 |
| Miaoyan Culture Media UK Ltd | Arts & recreation | 2025 |
| Miaoyi Ltd | Wholesale & retail | 2025 |
| Miatech Ltd | Wholesale & retail | 2025 |
| Micco International Trade Co., Ltd. | Administrative & support | 2025 |
| Miceo Enterprise Limited | Financial services | 2026 |
| Michael Kalu Coaching Ltd | Arts & recreation | 2020 |
| Michoks Limited | Wholesale & retail | 2025 |
| Micro Coding Ltd | Information & communication | 2025 |
| Micro Forge Ltd | Information & communication | 2026 |
| Microcom Technics LLP | | 2015 |
| Microfiber Biochem Limited | Extraterritorial | 2012 |
| Midas LAB Limited | Information & communication | 2025 |
| Midder Brothers Ltd | Wholesale & retail | 2024 |
| Middle-It Limited | Education | 2025 |
| Midland Storage Company Limited | Transport & logistics | 2025 |
| Midlands Courier Ltd | Transport & logistics | 2024 |
| Midlands Farm to Fork Ltd | Wholesale & retail | 2025 |
| Midlands Heat Treatment Ltd | Professional & scientific | 2019 |
| Midlands Transport Solutions Limited | Transport & logistics | 2024 |
| Midlands Truck and BUS Limited | Wholesale & retail | 2023 |
| Midnight Tales Press Ltd | Information & communication | 2025 |
| Midsummer Taro Ltd | Manufacturing | 2026 |
| Miele Electrical Appliances Co., Ltd. | Manufacturing | 2024 |
| Migao Mineral Resources Limited | Mining & quarrying | 2021 |
| Might and Grace Productions CIC | Health & social care | 2025 |
| Mighty Live Productions Ltd | Administrative & support | 2024 |
| Migiol Ltd | Extraterritorial | 2024 |
| Miglieri UK Ltd | Professional & scientific | 2024 |
| Miko Creations Ltd | Wholesale & retail | 2024 |
| Milbourne Consultants Limited | Professional & scientific | 2012 |
| Mile END Cottage Ltd | Hospitality | 2021 |
| Milieu Holdings Ltd | Manufacturing | 2024 |
| Mill Nutrition Foods Ltd | Wholesale & retail | 2026 |
| Milldata Computing Limited | Information & communication | 1998 |
| Millennial IT Services Ltd | Information & communication | 2021 |
| Miller Media Ltd | Information & communication | 2018 |
| Millie Mortgages Limited | Financial services | 2026 |
| Millie’S Place NW Ltd | Health & social care | 2026 |
| Milliways Investments Ltd. | Real estate | 2000 |
| Millroyd Island Management Company Limited | Households | 2003 |
| Millwhite Apartments Limited | Real estate | 2026 |
| Milo Global Commerce Limited | Wholesale & retail | 2026 |
| Milsec Group Limited | Administrative & support | 2025 |
| Mind Blowing Ltd | Information & communication | 2025 |
| Mind Healthcare Ltd | Health & social care | 2016 |
| Mind Sets Studio Ltd | Professional & scientific | 2016 |
| MIND4ADVENTURE CIC | Administrative & support | 2025 |
| Mindlink Ltd | Information & communication | 2021 |
| MINDNEST1638 Ltd | Information & communication | 2025 |
| Mindscape Publishing Ltd | Information & communication | 2024 |
| Mindset Initiatives Ltd | Wholesale & retail | 2024 |
| Mindworks Global Limited | Information & communication | 2025 |
| Mine Ltd | Other services | 2024 |
| Ming Heng Electronic Technology Co., Ltd | Administrative & support | 2023 |