| Mdrm Construction Ltd | Construction | 2025 |
| Mdrv Ltd | Information & communication | 2023 |
| MDS Facilities & Consulting Ltd | Professional & scientific | 2026 |
| Mdstelecom Ltd | Information & communication | 2024 |
| Mdstyling UK Limited | Wholesale & retail | 2020 |
| Mdws Services Limited | Construction | 2022 |
| ME Clinics Aesthetics Limited | Health & social care | 2024 |
| ME16 Maidstone Ltd | Real estate | 2022 |
| ME2UPROPERTY Ltd | Real estate | 2022 |
| Meadow Laboratories Limited | Wholesale & retail | 1997 |
| Meads Kitchen Ltd | Wholesale & retail | 2026 |
| Meal Rush Ltd | Hospitality | 2026 |
| Measu Services Limited | Health & social care | 2018 |
| Measure Group Ltd | Wholesale & retail | 2016 |
| Meat Street Ltd | Hospitality | 2023 |
| Meat the Grill Limited | Wholesale & retail | 2024 |
| Meatora Limited | Information & communication | 2025 |
| Meaty BUN Ltd | Hospitality | 2020 |
| Mebd Limited | Construction | 2025 |
| Mechanical Advantage Limited | Administrative & support | 2015 |
| Mechanical Operations Ltd | Construction | 2018 |
| Mechanicks Ltd | Wholesale & retail | 2022 |
| Mechcon Limited | Wholesale & retail | 2018 |
| Mechsmerize Real Estates Ltd | Real estate | 2024 |
| Mechsmerize Technologies Ltd | Information & communication | 2014 |
| Meco Maitha Ltd | Professional & scientific | 2013 |
| MED Device Limited | Professional & scientific | 2020 |
| MED Fusion Limited | Hospitality | 2023 |
| MED Travel Group Ltd | Administrative & support | 2018 |
| Med-Hab Healthcare Ltd | Health & social care | 2015 |
| Medace Healthcare Limited | Extraterritorial | 2015 |
| Medbarr Ltd | Health & social care | 2015 |
| Medcraft Surgical Ltd | Wholesale & retail | 2025 |
| Meddoc Healthcare Limited | Health & social care | 2014 |
| Medetick UK Ltd | Health & social care | 2020 |
| Media Blue Ltd | Information & communication | 2013 |
| Media Mystery Ltd | Information & communication | 2026 |
| Mediasat Limited | Other services | 2014 |
| Medic First Limited | Real estate | 2018 |
| Medical 2 ME UK Ltd | Wholesale & retail | 2025 |
| Medical Angels Group Limited | Wholesale & retail | 2020 |
| Medical Angels Practice Limited | Wholesale & retail | 2020 |
| Medical Consultations Online Ltd | Professional & scientific | 2023 |
| Medical Craft Limited | Wholesale & retail | 2011 |
| Medical Media Arts Ltd | Information & communication | 2022 |
| Medicare Health Services Ltd | Real estate | 2007 |
| Medicare Link Limited | Health & social care | 2021 |
| Medicines First Ltd | Health & social care | 2019 |
| Medics Across UK Ltd | Health & social care | 2024 |
| Medics Group Limited | Health & social care | 2024 |
| Medicube Limited | Health & social care | 2016 |
| Medicure Scientific Limited | Wholesale & retail | 2014 |
| Medicwel Ltd | Wholesale & retail | 2025 |
| Mediforce Locum Ltd | Administrative & support | 2019 |
| Medinbrand 2 Limited | Real estate | 2019 |
| Medinbrand Limited | Real estate | 1998 |
| Meditate Ltd | Wholesale & retail | 2025 |
| Medivine Ltd | Wholesale & retail | 2025 |
| Mediwise Pharma Ltd | Health & social care | 2026 |
| Medkaf Limited | Health & social care | 2022 |
| Medmate Ltd | Health & social care | 2015 |
| Mednutri Ltd | Health & social care | 2024 |
| Medow Enterprise Ltd | Administrative & support | 2024 |
| Medrecs Recruitment Ltd | Administrative & support | 2025 |
| Meds Energy Solutions Ltd | Construction | 2026 |
| Medsell Limited | Health & social care | 2024 |
| Medsphere Health Ltd | Health & social care | 2025 |
| Medtech Pharma Solutions Ltd | Professional & scientific | 2024 |
| Medtech Solutions Limited | Health & social care | 2020 |
| Medtronic Innovation Ltd | Wholesale & retail | 2023 |
| Meduolis Ltd | Wholesale & retail | 2021 |
| Medway GP Ltd | Extraterritorial | 2025 |
| Medwithmo Ltd | Health & social care | 2023 |
| Medx-Uk Ltd | Other services | 2015 |
| Mee-Maa Properties Ltd | Real estate | 2023 |
| Mee-Maa Services Ltd | Administrative & support | 2013 |
| Meeg English Ltd | Wholesale & retail | 2026 |
| Meemford & Co Ltd | Professional & scientific | 2018 |
| Meer & Co Consultants Ltd. | Professional & scientific | 2025 |
| Meesh Jewellery Limited | Wholesale & retail | 2023 |
| Meet the Patelianos Ltd | Extraterritorial | 2011 |
| Meetch K9 Ltd | Administrative & support | 2021 |
| Meezan Security Ltd | Administrative & support | 2026 |
| MEG E-Com Ltd | Wholesale & retail | 2025 |
| Mega 5 Protection Services Ltd | Administrative & support | 2011 |
| Mega Bazaar Limited | Wholesale & retail | 2025 |
| Mega Developers Limited | Construction | 2023 |
| Mega Media Printing Ltd | Manufacturing | 2015 |
| Mega Mind Technologies Ltd | Information & communication | 2022 |
| Megabite Solutions Ltd | Wholesale & retail | 2025 |
| Megabyte System Services Limited | Information & communication | 2001 |
| Megafavi Limited | Wholesale & retail | 2014 |
| Megamart Central Limited | Wholesale & retail | 2025 |
| Megastream Marketing Ltd | Education | 2015 |
| Megha Properties Limited | Real estate | 1988 |
| Meghna Enterprise London Limited | Professional & scientific | 2023 |
| Megir Limited | Wholesale & retail | 2018 |
| MEGITA2007 Limited | Health & social care | 2016 |
| Mehak Scents Ltd | Wholesale & retail | 2021 |
| Mehan Property and Investments Ltd | Hospitality | 2017 |