| Mirica Limited | Wholesale & retail | 2021 |
| Mirluc Ltd | Wholesale & retail | 2025 |
| Mirute Ltd | Wholesale & retail | 2025 |
| Mirzai Management Ltd | Administrative & support | 2016 |
| Mirzai Property Holdings Limited | Construction | 2024 |
| Mirzai Property Limited | Financial services | 2022 |
| MIS Autos Ltd | Wholesale & retail | 2024 |
| MIS ENG Solution Limited | Professional & scientific | 2018 |
| MIS Plastering Ltd | Construction | 2017 |
| MIS Plumbing & Heating Ltd | Construction | 2018 |
| MIS Service Ltd | Construction | 2018 |
| MIS Software Services Ltd | Information & communication | 2022 |
| Miselle Fashions Limited | Wholesale & retail | 1980 |
| Mishmash Kits Ltd | Manufacturing | 2025 |
| Mishti Enterprise PVT Ltd Ltd | Wholesale & retail | 2025 |
| Mishtry Indian Foods Limited | Hospitality | 2023 |
| Misideal Ltd | Information & communication | 2025 |
| Misios Trading Limited | Administrative & support | 2023 |
| Mispa Events Limited | Education | 2015 |
| Misri Enterprise Consultancy Ltd | Wholesale & retail | 2023 |
| Misri Fruit and VEG Ltd | Wholesale & retail | 2021 |
| Miss Camellia Ltd | Wholesale & retail | 2024 |
| Miss Emma Ltd | Education | 2026 |
| Miss G L Lewis Limited | Administrative & support | 2017 |
| Miss P Ltd | Hospitality | 2024 |
| Miss Perry Presents Limited | Information & communication | 2013 |
| Missionary Servants of the Poor TW | Education | 2010 |
| Mist Security Ltd | Other services | 2026 |
| Mistley Associates Limited | Professional & scientific | 2010 |
| Mistry Electrical Testing Limited | Construction | 2014 |
| Mistry Properties Limited | Households | 2012 |
| MIT Software Solutions Ltd | Information & communication | 2024 |
| Mita Limited | Hospitality | 2021 |
| Mital Ltd | Professional & scientific | 2011 |
| Mitchell Cotts East and Central Africa Limited | Other services | 1906 |
| Mitchell Cotts Limited | Professional & scientific | 1989 |
| Miti Enterprice Ltd | Wholesale & retail | 2025 |
| Miti Plastering Ltd | Construction | 2022 |
| Mitra Homes Limited | Real estate | 2021 |
| Mitraana Ltd | Wholesale & retail | 2025 |
| Mitraseva | Arts & recreation | 2018 |
| Mitreledge Limited | Arts & recreation | 1981 |
| Mitrolabs AI Ltd | Information & communication | 2026 |
| Mitrut Ltd | Construction | 2025 |
| Mits Hair & Beauty Ltd | Other services | 2025 |
| Mittal Enterprise Limited | Wholesale & retail | 2026 |
| Mittal Group UK Ltd | Wholesale & retail | 2023 |
| Mivaan Building Contractors Ltd | Construction | 2025 |
| Mivote Technology Limited | Information & communication | 2020 |
| MIX Hair & Beauty Limited | Other services | 2013 |
| MIX Lighting Ltd | Construction | 2015 |
| Mizwa Motorsport Limited | Extraterritorial | 2025 |
| MJ & CJ Ltd | Construction | 2020 |
| MJ Carecentre Limited | Health & social care | 2006 |
| MJ Estate Investments Limited | Real estate | 2025 |
| MJ Food & Wine Ltd | Wholesale & retail | 2023 |
| MJ Global Investments Limited | Real estate | 2015 |
| MJ Healthcare Service Limited | Health & social care | 2021 |
| MJ London Holdings Ltd | Administrative & support | 2019 |
| MJ Mulla Ltd | Professional & scientific | 2012 |
| MJ Rubbish Ltd | Water & waste | 2025 |
| Mj&S Electrical Ltd | Construction | 2016 |
| MJA Electrical Services Ltd | Construction | 2021 |
| MJD Biotech Ltd | Professional & scientific | 2020 |
| MJD Driven Events Limited | Administrative & support | 2008 |
| MJG Accountants Ltd | Professional & scientific | 2021 |
| MJH Property Management Limited | Real estate | 2000 |
| MJJ Corporation Limited | Manufacturing | 2024 |
| Mjjb Consultants Limited | Other services | 2024 |
| MJM Medical Limited | Health & social care | 2025 |
| Mjmacdonald Property Ltd | Real estate | 2026 |
| MJW Design & Construction Limited | Construction | 2022 |
| MJZ Holdings Ltd | Financial services | 2026 |
| MK Complete Joinery Limited | Manufacturing | 2018 |
| MK Convinience Store Ltd | Wholesale & retail | 2018 |
| MK Entertainment Limited | Arts & recreation | 2022 |
| MK Global Consultants Ltd | Information & communication | 2015 |
| MK Harts Limited | Hospitality | 2019 |
| MK Management Solutions Ltd | Construction | 2026 |
| MK UK Group Ltd | Wholesale & retail | 2026 |
| MK3 Home Ltd | Real estate | 2019 |
| MKA Foods Ltd | Hospitality | 2017 |
| MKC Trading Ltd | Wholesale & retail | 2022 |
| MKD Services Ltd | Administrative & support | 2025 |
| MKG Countryside Limited | Real estate | 2018 |
| Mkgs Shop Ltd | Wholesale & retail | 2021 |
| MKH Homes Limited | Real estate | 2024 |
| MKJ Apparel Ltd | Wholesale & retail | 2024 |
| MKK Enterprises Limited | Hospitality | 2013 |
| MKM Archi Design Ltd | Professional & scientific | 2021 |
| Mkmfit Ltd | Wholesale & retail | 2020 |
| Mkms Consultancy Ltd | Health & social care | 2022 |
| MKP2 Limited | Hospitality | 2020 |
| MKS Power Limited | Information & communication | 2022 |
| MKU Investments Limited | Real estate | 2012 |
| Mkur Ltd | Hospitality | 2025 |
| MKV Health Ltd | Health & social care | 2022 |
| Mkwb Cleaning Limited | Administrative & support | 2023 |
| MKZ Enterprise Ltd | Wholesale & retail | 2024 |
| MKZ Hair Lounge Ltd | Other services | 2024 |