| Minerva Contingency Ltd | Administrative & support | 2025 |
| Ming Xuan Limited | Hospitality | 2025 |
| Mini Print Factory Ltd | Wholesale & retail | 2025 |
| Minster Grange Limited | Health & social care | 2012 |
| Minton & Whyles Ltd | Construction | 2021 |
| Minzat Solutions Ltd | Wholesale & retail | 2021 |
| Miracle Mutts Pet Parlour Ltd | Wholesale & retail | 2021 |
| Miracle Supported Housing Ltd | Real estate | 2021 |
| Mirchi Catering Limited | Hospitality | 2013 |
| Miric Engineering (Holdings) Limited | Financial services | 2013 |
| Miric Engineering Limited | Manufacturing | 1991 |
| Mirrorless Rentals Ltd | Administrative & support | 2023 |
| Mirrorworks Limited | Information & communication | 2025 |
| Mirza Medics Ltd | Health & social care | 2015 |
| Mirza Smart Store Enterprises Ltd | Wholesale & retail | 2025 |
| MIS Global Holdings Limited | Health & social care | 2020 |
| Mishmash Healthcare Limited | Health & social care | 2022 |
| Misk Export Ltd | Wholesale & retail | 2025 |
| Miss Acrux Limited | Wholesale & retail | 2020 |
| Mister Shenanigans Limited | Hospitality | 2023 |
| Miszmasz Ltd | Wholesale & retail | 2024 |
| Mitechtoys Ltd | Wholesale & retail | 2022 |
| Mitek System Ltd | Manufacturing | 2026 |
| Mivi Supported Services Ltd | Health & social care | 2023 |
| Mixed Martial Arts Group Limited | Arts & recreation | 2025 |
| Mizdrape Ltd | Administrative & support | 2024 |
| Mizora Limited | Wholesale & retail | 2025 |
| Mizy-May Cleaning Services Limited | Administrative & support | 2025 |
| Miźandeli Ltd | Hospitality | 2026 |
| MJ Haulage Ltd | Transport & logistics | 2024 |
| MJ Pharma Limited | Professional & scientific | 2023 |
| MJ Property Renovations Ltd | Real estate | 2023 |
| MJ Realty Partners Ltd | Real estate | 2025 |
| MJ Simba Limited | Health & social care | 2022 |
| MJ Trans Ltd | Transport & logistics | 2014 |
| Mj&S Ltd | Construction | 2025 |
| MJA Home & Improvements Ltd | Wholesale & retail | 2025 |
| MJB Electrical Services (Midlands) Limited | Other services | 2013 |
| MJC Carpentry Services (Midlands) Ltd | Manufacturing | 2019 |
| MJC Engineering Group UK Ltd | Construction | 2026 |
| MJF Properties (Midlands) Ltd | Real estate | 2015 |
| MJK Installations Limited | Construction | 2016 |
| MJK Maintenance Group Ltd | Construction | 2024 |
| Mjktrade Ltd | Wholesale & retail | 2023 |
| MJL Roofing (Walsall) Limited | Construction | 2025 |
| MJM Travels Limited | Transport & logistics | 2025 |
| MJN Care CIC | Health & social care | 2026 |
| MJR Landscapes Limited | Construction | 2023 |
| MJR Secure Couriers Ltd | Transport & logistics | 2024 |
| MJS Building Services Ltd | Construction | 2016 |
| MJT Utilities Ltd | Construction | 2025 |
| MJW Care Ltd | Health & social care | 2017 |
| MK Auditors Ltd | Professional & scientific | 2024 |
| MK Catering (Walsall) Ltd | Hospitality | 2017 |
| MK Fleet Care Ltd | Wholesale & retail | 2024 |
| MK Overseas Ltd | Administrative & support | 2017 |
| MK Pharma Limited | Wholesale & retail | 2013 |
| MK Property Estate Ltd | Real estate | 2025 |
| MK Skincare Ltd | Wholesale & retail | 2026 |
| MK Staircases Ltd | Manufacturing | 2026 |
| MK Vehicle Sales Ltd | Wholesale & retail | 2024 |
| MKB Business Ltd | Real estate | 2015 |
| MKB Earthworks Ltd | Water & waste | 2018 |
| MKB Group Ltd | Administrative & support | 2025 |
| MKD Contracts Ltd | Transport & logistics | 2018 |
| MKG (UK) Ltd | Hospitality | 2000 |
| MKG Foods Limited | Professional & scientific | 1968 |
| Mkgb Plumbing and Heating Limited | Construction | 2019 |
| MKH Consultancy Ltd | Professional & scientific | 2024 |
| MKH Utilities Ltd | Construction | 2023 |
| Mkhosi Estates Ltd | Real estate | 2026 |
| Mkht Limited | Wholesale & retail | 2022 |
| MKR Developments Limited | Real estate | 2024 |
| ML Rail Engineering Limited | Construction | 2018 |
| MLC Property Management Services Limited | Real estate | 2025 |
| Mlcm Properties Limited | Real estate | 2024 |
| MLJ Properties WM Ltd | Real estate | 2022 |
| MLK Transport Ltd | Transport & logistics | 2022 |
| MLM Sport Limited | Wholesale & retail | 2018 |
| MLS Property Ltd | Real estate | 2015 |
| MLW Holdings Limited | Financial services | 2020 |
| MLW New Street Developments Limited | Construction | 2020 |
| MLW Property Group Limited | Real estate | 2020 |
| MLW Trading Ltd | Wholesale & retail | 2007 |
| MLW UK Developments Limited | Construction | 2020 |
| Mmdp Properties Ltd | Real estate | 2025 |
| Mmika Art Limited | Wholesale & retail | 2021 |
| MMO Trans Ltd | Transport & logistics | 2017 |
| MN Property Services Ltd | Real estate | 2025 |
| MNA Enterprises Limited | Administrative & support | 2012 |
| Mnauk Ltd | Wholesale & retail | 2025 |
| MNR Advisory Ltd | Professional & scientific | 2025 |
| MNV Healthcare Ltd | Health & social care | 2016 |
| Mo's Bar Limited | Hospitality | 2019 |
| MO7 Limited | Arts & recreation | 2025 |
| MO7 Properties Limited | Real estate | 2025 |
| Mobile Auto Solutions Ltd | Wholesale & retail | 2025 |
| Mobile Care Retail Limited | Information & communication | 2015 |
| Mobile Cover Services Limited | Manufacturing | 2002 |
| Mobile FUN Limited | Wholesale & retail | 2000 |