| Mirza Investments Ltd | Real estate | 2018 |
| Miskuzy Enterprise Limited | Wholesale & retail | 2021 |
| Misramedics Limited | Health & social care | 2022 |
| Miss Hilda’S Food Group Limited | Wholesale & retail | 2019 |
| Miss MOD Hairdressing Limited | Other services | 2003 |
| Miss Nails NTN Ltd | Other services | 2018 |
| Miss Pretty Beauty House Ltd | Other services | 2025 |
| Mistry Group Ltd | Real estate | 2022 |
| Mistry Locum Ltd | Wholesale & retail | 2022 |
| Mistybloom Properties Limited | Real estate | 2026 |
| Mitonoptimal Portfolio Management (UK) Limited | Financial services | 2016 |
| Mitre Residents Association Limited | Households | 2020 |
| Mituleh Property Ltd | Real estate | 2021 |
| MIX & Match Hangers Ltd | Wholesale & retail | 2011 |
| Mixedvisuals Ltd | Arts & recreation | 2025 |
| Mixtio Ltd | Manufacturing | 2022 |
| Miyagi's Car Wash Ltd | Manufacturing | 2022 |
| Miyla Holdings Limited | Other services | 2023 |
| MJ & Jony Ltd | Construction | 2018 |
| MJ & Sons Building Solutions Ltd | Construction | 2021 |
| MJ Boss Limited | Health & social care | 2025 |
| MJ Furber Holdings Limited | Financial services | 2025 |
| MJ Grand Properties Limited | Real estate | 2025 |
| MJ Pahal Properties Limited | Financial services | 2024 |
| MJ Real Estate Investments Limited | Real estate | 2023 |
| MJ Rugeley Ltd | Construction | 2024 |
| MJ Secured Ltd | Wholesale & retail | 2020 |
| MJ Tech-Media Ltd | Wholesale & retail | 2025 |
| MJB Reserves Limited | Real estate | 2026 |
| MJB2G MS CIC | Health & social care | 2025 |
| MJC Solutions Limited | Real estate | 2022 |
| MJG Solutions Ltd | Professional & scientific | 2025 |
| Mjkd City Living Ltd | Construction | 2021 |
| Mjnl Services Limited | Professional & scientific | 2018 |
| MJP Installations Ltd | Construction | 2023 |
| MJR Midlands Ltd | Transport & logistics | 2024 |
| MJS Business Solutions Ltd | Transport & logistics | 2022 |
| Mjsauk Ltd | Real estate | 2023 |
| MK and Sons Business Limited | Construction | 2021 |
| MK and Sons Enterprises Limited | Construction | 2021 |
| MK Business and Consulting Ltd | Information & communication | 2023 |
| MK Construction Services Ltd | Construction | 2026 |
| MK Rapidroute Ltd | Transport & logistics | 2025 |
| MK Realty Investments Limited | Real estate | 2025 |
| MK Transport(Midland) Ltd | Transport & logistics | 2021 |
| MKB Healthcare Ltd | Health & social care | 2025 |
| MKB Hire Limited | Administrative & support | 2026 |
| MKE Exterior Cleaning Ltd | Administrative & support | 2026 |
| MKG Healthcare Solutions Limited | Health & social care | 2017 |
| Mkkd Group Limited | Financial services | 2025 |
| Mkkd Trading Limited | Health & social care | 2025 |
| MKL Solutions Limited | Information & communication | 2007 |
| MKM Care Rugby Ltd | Wholesale & retail | 2024 |
| MKP Haulage Ltd | Transport & logistics | 2016 |
| Mkrsa Ltd | Financial services | 2022 |
| MKS & VN Ltd | Administrative & support | 2024 |
| Mksandhuconstruction Ltd | Construction | 2025 |
| Mkts Best Limited | Wholesale & retail | 2023 |
| ML Datahouse Limited | Information & communication | 2026 |
| ML Kanyi Services Limited | Wholesale & retail | 2023 |
| MLB Mechanical Ltd | Construction | 2018 |
| MLD Transport Ltd | Transport & logistics | 2026 |
| MLE Roofing Ltd | Construction | 2026 |
| MLH Limited | Wholesale & retail | 2003 |
| MLR UK Trading Limited | Wholesale & retail | 2026 |
| MM Wolverhampton Limited | Administrative & support | 2014 |
| MM1BARBER Shop Ltd | Other services | 2025 |
| MMA Resources Limited | Information & communication | 2009 |
| MMD Enterprises Ltd | Wholesale & retail | 2025 |
| Mmiano Limited | Transport & logistics | 2025 |
| MMJ Supermarket Ltd | Wholesale & retail | 2016 |
| MMS Recovery (Wolverhampton) Ltd | Wholesale & retail | 2004 |
| MMS Recovery Limited | Wholesale & retail | 2002 |
| MMS Star Ltd | Wholesale & retail | 2025 |
| Mmth Capital Ltd | Financial services | 2025 |
| MN Training Academy Ltd | Real estate | 2022 |
| MNB Leisure Ltd | Professional & scientific | 2021 |
| MNC Construction Limited | Construction | 2020 |
| MNC Properties Limited | Real estate | 1996 |
| MNF Property Services LLP | | 2023 |
| MNG Core Ltd | Construction | 2026 |
| MNI Real Estate Limited | Real estate | 2025 |
| MNL Tours Ltd | Administrative & support | 2022 |
| Mnlh Properties Limited | Construction | 2014 |
| Mnsa Investments Ltd | Real estate | 2019 |
| MO Bains Limited | Administrative & support | 2024 |
| MO Executive Consulting Ltd | Professional & scientific | 2022 |
| MO Prints Shop Ltd | Manufacturing | 2026 |
| Mo'Vika Empire Ltd | Wholesale & retail | 2025 |
| Moat House Laundry Limited | Other services | 2023 |
| Mobile Barber Hub Ltd | Other services | 2019 |
| Mobile Data Communications. Ltd | Information & communication | 2023 |
| Mobile Extravaganza Limited | Administrative & support | 2022 |
| Mobile PAY Systems Limited | Information & communication | 2015 |
| Mobile Pizza Trader Ltd | Hospitality | 2014 |
| Mobilink Courier Ltd | Transport & logistics | 2022 |
| Mobilink Repair UK Limited | Wholesale & retail | 2017 |
| Mobliemaintenancesolutions Ltd | Wholesale & retail | 2025 |
| Mobolo Limited | Real estate | 2025 |
| Mobs Trading Ltd | Wholesale & retail | 2026 |