| MFH Engineering Holdings 2017 Limited | Manufacturing | 2017 |
| MFH Fleet Services Limited | Administrative & support | 1997 |
| MFK Bakery Ltd | Wholesale & retail | 2020 |
| Mfno Farm Limited | Construction | 2025 |
| MFS Global Ltd | Wholesale & retail | 2023 |
| MFS Trade Centers Ltd | Wholesale & retail | 2018 |
| MFT Engineering Ltd | Manufacturing | 2017 |
| MFT Surveying & Retrofit Ltd | Arts & recreation | 2017 |
| MG Builder and Roofers Ltd | Construction | 2024 |
| MG Cafe Limited | Hospitality | 2026 |
| MG Haulage & Pallet Storage Limited | Transport & logistics | 2020 |
| MG Haulage Distribution and Storage Limited | Transport & logistics | 2025 |
| MG Hughes Financial Ltd | Financial services | 2015 |
| MG Logistics Cambs Limited | Transport & logistics | 2025 |
| MG Mart Ltd | Wholesale & retail | 2024 |
| MG Process Evolution Ltd | Professional & scientific | 2025 |
| MG Rental PHV Ltd | Transport & logistics | 2024 |
| MG Sardinia Limited | Hospitality | 2016 |
| MG Urban Investments Limited | Real estate | 2021 |
| MG Windows Ltd | Administrative & support | 2020 |
| MGC Associates Limited | Professional & scientific | 2016 |
| MGE Installations Ltd | Construction | 2024 |
| MGR Properties (Yorkshire) Limited | Real estate | 2015 |
| Mgrw Financial Services Limited | Other services | 2015 |
| Mgrw Limited | Extraterritorial | 2015 |
| MGS Products Ltd | Wholesale & retail | 2018 |
| MGSO4 Limited | Real estate | 2025 |
| MGT Consultancy Ltd | Information & communication | 2008 |
| Mguk Limited | Wholesale & retail | 2021 |
| MH (1) Ltd | Real estate | 2022 |
| MH (Sheff) Enterprises Limited | Hospitality | 2023 |
| MH ALI Developments Limited | Construction | 2023 |
| MH Auto Sales Limited | Wholesale & retail | 2026 |
| MH Compliance Services Ltd | Professional & scientific | 2018 |
| MH Cooling Ltd | Construction | 2026 |
| MH Global Consultancy Limited | Professional & scientific | 2020 |
| MH Griffin Design Services Ltd | Professional & scientific | 2025 |
| MH Interior Fit OUT Ltd. | Construction | 2015 |
| MH Joiners Ltd | Construction | 2011 |
| MH Property Solution Ltd | Construction | 2023 |
| MH Recovery Service Ltd | Other services | 2023 |
| MH Retail Store Ltd | Wholesale & retail | 2021 |
| MH Road Haulage Ltd | Transport & logistics | 2026 |
| MH Test Services Ltd | Information & communication | 2018 |
| MHA Roofing Limited | Construction | 2025 |
| MHB Investments Ltd | Financial services | 2022 |
| MHC Properties Ltd | Real estate | 2023 |
| MHC Sales Ltd | Wholesale & retail | 2025 |
| MHE Consultancy Ltd | Transport & logistics | 2020 |
| MHE Electrical Ltd | Construction | 2023 |
| MHE Property Lets Ltd | Real estate | 2023 |
| MHH Biomass Limited | Wholesale & retail | 2016 |
| MHH Contracting Limited | Wholesale & retail | 1985 |
| Mhhy Properties Limited | Real estate | 2021 |
| MHJ Music Limited | Information & communication | 2025 |
| MHK Developments Ltd | Construction | 2018 |
| MHK Global Ltd | Wholesale & retail | 2018 |
| MHM MGT Limited | Professional & scientific | 2025 |
| MHM Recycling Materials Ltd | Professional & scientific | 2017 |
| MHR Cars Ltd | Wholesale & retail | 2024 |
| MHR Joinery Limited | Construction | 2015 |
| MHR Properties Limited | Construction | 2016 |
| MHS Gastro Limited | Health & social care | 2023 |
| Mhsk Holdings Ltd | Financial services | 2025 |
| MI Big House Limited | Real estate | 2020 |
| MI Recovery Service Ltd | Transport & logistics | 2024 |
| MI Studio Creative Ltd | Other services | 2026 |
| MI Surveying Ltd | Professional & scientific | 2023 |
| MI Tribu Ltd | Wholesale & retail | 2025 |
| Mi-Trial Limited | Information & communication | 2021 |
| MIA Evans Estate Agency Limited | Real estate | 2025 |
| MIA Intelligence Ltd | Education | 2023 |
| MIA Logisitics Limited | Transport & logistics | 2024 |
| MIA Rose Gifts Ltd | Wholesale & retail | 2019 |
| Miah Assets Management Limited | Real estate | 2025 |
| Mibera Consulting Ltd | Professional & scientific | 2024 |
| Mica Consulting Services Limited | Professional & scientific | 2003 |
| Micas (UK) Limited | Professional & scientific | 2014 |
| Micgoodier Limited | Hospitality | 2024 |
| Michael Banks Consulting Limited | Professional & scientific | 2002 |
| Michael Bartholomew Limited | Manufacturing | 1926 |
| Michael Drapers Limited | Wholesale & retail | 1975 |
| Michael Edwards Scrap Metal Ltd | Wholesale & retail | 2007 |
| Michael MAY Knives Ltd | Manufacturing | 2022 |
| Michael P Bowes Consulting Limited | Information & communication | 2013 |
| Michael Pennington Limited | Arts & recreation | 1986 |
| Michael Robinson Transport Limited | Transport & logistics | 2015 |
| Michael Sedler Antiques Limited | Wholesale & retail | 2009 |
| Michael Self Partnership Limited | Professional & scientific | 1993 |
| Michael Spine Services Limited | Health & social care | 2010 |
| Michael Thackray Limited | Professional & scientific | 2025 |
| Michal Drive Ltd | Transport & logistics | 2019 |
| Michal Properties Limited | Real estate | 2021 |
| Michelangelo's Barbers Ltd | Real estate | 2013 |
| Michelemyoga Limited | Arts & recreation | 2017 |
| Michelle & HEY Limited | Real estate | 2019 |
| Michelle Danks Limited | Professional & scientific | 2019 |
| Michelle Hazlewood | Professional & scientific | 2012 |
| Michelle Mullins Limited | Professional & scientific | 2006 |
| Michelle Rawlins Ltd | Manufacturing | 2012 |