| Mscskin Ltd | Health & social care | 2025 |
| Mscx Limited | Professional & scientific | 2024 |
| MSD Food Solutions Ltd | Professional & scientific | 2021 |
| MSD Property Limited | Real estate | 2017 |
| Msdb Ltd | Real estate | 2023 |
| Msed Health Ltd | Education | 2025 |
| MSF Welland Valley Feeds Limited | Wholesale & retail | 1994 |
| MSG Trade Ltd | Wholesale & retail | 2024 |
| MSI (Leicester) Ltd | Real estate | 2025 |
| Msi-Accountants & Bookkeepers Ltd | Professional & scientific | 2019 |
| MSJ Food Ltd | Hospitality | 2025 |
| MSJ Investments Ltd | Health & social care | 2008 |
| MSK Digital Tools Ltd | Information & communication | 2025 |
| MSK Osteopath Limited | Health & social care | 2017 |
| Mski Limited | Extraterritorial | 2022 |
| MSL Garage Ltd | Wholesale & retail | 2025 |
| Mslfit Ltd | Arts & recreation | 2020 |
| Mslusciousuk Ltd | Other services | 2023 |
| MSM Cosmetics Limited | Wholesale & retail | 2025 |
| MSM Couriers Ltd | Transport & logistics | 2026 |
| MSM Investments Ltd | Financial services | 2023 |
| MSM Krupa Property Development and Management Limited | Real estate | 2024 |
| MSM Optics Ltd | Health & social care | 2024 |
| MSM Solutions Limited | Information & communication | 2025 |
| MSN Contract Services Ltd | Real estate | 2006 |
| Msnp Limited | Hospitality | 2018 |
| MSO CS Limited | Arts & recreation | 2010 |
| MSP Car Customs Ltd | Wholesale & retail | 2022 |
| MSP Investments Limited | Real estate | 2015 |
| MSP Property Group Ltd | Construction | 2024 |
| MSP Spines Ltd | Health & social care | 2022 |
| Mspg Construction Limited | Construction | 2020 |
| Msquared Gardening & Co Ltd | Construction | 2025 |
| MSR Health Limited | Health & social care | 2014 |
| MSR Property Enterprises Ltd | Real estate | 2022 |
| MSR Wholesale Ltd | Wholesale & retail | 2024 |
| Msrp Properties Ltd | Real estate | 2021 |
| MSS Property Limited | Real estate | 2017 |
| MSS Systems Limited | Professional & scientific | 1988 |
| MSS Transport Ltd | Transport & logistics | 2025 |
| Mssc (UK) Holdings Limited | Financial services | 2026 |
| Mssc Legal Limited | Professional & scientific | 2026 |
| Mssk Ltd | Wholesale & retail | 2019 |
| Mssr Properties Ltd | Real estate | 2021 |
| MST Online Limited | Wholesale & retail | 2015 |
| MST Sweet Ltd | Wholesale & retail | 2023 |
| MSW Cheltenham Ltd | Health & social care | 2026 |
| MSW Consultancy Services Ltd | Health & social care | 2024 |
| MSW Consulting UK Ltd | Professional & scientific | 2024 |
| MSW Liverpool Ltd | Health & social care | 2026 |
| MSW Shop Online Ltd | Wholesale & retail | 2026 |
| MSW UK Counselling Ltd | Health & social care | 2025 |
| MSW UK Holdings Ltd | Health & social care | 2025 |
| MSY Optocare Ltd | Health & social care | 2025 |
| Msynergy Ltd | Professional & scientific | 2026 |
| Msze 001 Ltd | Wholesale & retail | 2024 |
| MT Energy Limited | Construction | 2023 |
| MT Foskett Consultancy Limited | Professional & scientific | 2025 |
| MT Plumbing & Heating Solutions Ltd | Construction | 2024 |
| MT Property Management Limited | Real estate | 2006 |
| MT Training Services Limited | Education | 2020 |
| MT Used Car Sales Ltd | Wholesale & retail | 2026 |
| MT. Loop Hospitality Ltd | Hospitality | 2026 |
| MT. Loop Ltd | Administrative & support | 2024 |
| MTA Invest UK Ltd | Real estate | 2017 |
| MTA Logistic Ltd | Transport & logistics | 2019 |
| Mtb-Company Ltd | Other services | 2017 |
| MTD Entertainment Ltd | Administrative & support | 2023 |
| MTD Property Maintenance Services Ltd | Construction | 2024 |
| Mtdnow Ltd | Professional & scientific | 2026 |
| Mthf Properties Limited | Extraterritorial | 2016 |
| MTL Boys Limited | Real estate | 2023 |
| MTL Property Ltd | Real estate | 2021 |
| MTL Ventures Limited | Manufacturing | 2010 |
| MTM Astro Sports Ltd | Other services | 2019 |
| MTM Care Services Limited | Health & social care | 2018 |
| MTM Electronics Limited | Real estate | 2015 |
| MTM Psychiatry Consultancy Ltd | Health & social care | 2020 |
| Mtmproprietors Ltd | Real estate | 2025 |
| Mtmsmartsolutions Limited | Professional & scientific | 2023 |
| MTN Drive Ltd | Transport & logistics | 2014 |
| MTN Property Co Ltd | Real estate | 2026 |
| MTN Property Management Ltd | Real estate | 2025 |
| MTR Electrical Installations Ltd | Manufacturing | 2024 |
| MTR Tech Limited | Information & communication | 2024 |
| Mtrans Ltd | Transport & logistics | 2024 |
| MTS Assets Limited | Financial services | 2020 |
| MTS International Ltd | Wholesale & retail | 2017 |
| MTS Investment Group Limited | Real estate | 2025 |
| MTV Logistics Ltd | Transport & logistics | 2025 |
| MTY Properties Ltd | Real estate | 2012 |
| MTZ Joinery Ltd | Manufacturing | 2023 |
| MU Bubbletea Limited | Hospitality | 2021 |
| MUA Ventures Limited | Financial services | 2022 |
| Muad Hashi Ltd | Wholesale & retail | 2023 |
| Muau Limited | Wholesale & retail | 2024 |
| Mubashirun Ltd | Administrative & support | 2022 |
| Mubz Driving School Limited | Education | 2026 |
| Mubz Gifts Ltd | Wholesale & retail | 2023 |
| Muccel Ltd | Wholesale & retail | 2021 |