| MH Cleaning Ltd | Administrative & support | 2026 |
| MH Hybrid Cars Limited | Wholesale & retail | 2026 |
| MH Property Services Yorkshire Ltd | Real estate | 2024 |
| MH Sealing Solutions Ltd | Wholesale & retail | 2026 |
| MH7 Limited | Professional & scientific | 2011 |
| MHA Consulting UK Ltd | Administrative & support | 2026 |
| MHC Wholesalers Ltd | Wholesale & retail | 2022 |
| Mhhome Ltd | Wholesale & retail | 2021 |
| MHI Clinical Holdings Ltd | Health & social care | 2021 |
| MHI Consultancy Ltd | Health & social care | 2021 |
| MHI UK Clinics Ltd | Health & social care | 2025 |
| MHJ Estates Ltd | Real estate | 2026 |
| Mhlh Limited | Financial services | 2026 |
| MHN Logistics Ltd | Administrative & support | 2025 |
| MHN Services Ltd | Financial services | 2018 |
| Mhonline Ltd | Wholesale & retail | 2020 |
| Mhpp Properties Ltd | Real estate | 2022 |
| Mhrh Limited | Financial services | 2020 |
| MHS Pharms Ltd | Health & social care | 2022 |
| MI Global Trading Limited | Professional & scientific | 2014 |
| MI Locums Ltd | Health & social care | 2010 |
| MI Merchants Ltd | Wholesale & retail | 2023 |
| MI PIE Ltd | Wholesale & retail | 2026 |
| MI Utilities Ltd | Construction | 2023 |
| Mi-My Collection Ltd | Wholesale & retail | 2023 |
| MIA Pharmacare Ltd | Health & social care | 2023 |
| MIA Sports Solutions Limited | Arts & recreation | 2013 |
| Miah Medical Limited | Professional & scientific | 2021 |
| Miamed Clinic Ltd | Health & social care | 2021 |
| Mibak Limited | Health & social care | 2021 |
| MIC Trading Co. Limited | Wholesale & retail | 2022 |
| Micer Investments Ltd | Real estate | 2024 |
| Michael Andrew Cars Limited | Wholesale & retail | 2023 |
| Michael Delaney & Sons Limited | Construction | 2002 |
| Michael Foran Limited | Health & social care | 2025 |
| Michael Higginbottom Ltd | Construction | 2013 |
| Michael Kobuta Property’S Ltd | Real estate | 2026 |
| Michael P Harris (Opticians) Limited | Wholesale & retail | 1984 |
| Michael Postlethwaite - Editor Ltd | Information & communication | 2017 |
| Michaelson Properties Limited | Construction | 1962 |
| Michelle Andrew Limited | Professional & scientific | 2023 |
| Michtat Ltd | Health & social care | 2018 |
| Micklemore Lake and Lodges Development Ltd | Construction | 2023 |
| Micklethwaite & Ward Ltd | Construction | 2022 |
| Microdynamix Ltd | Information & communication | 2018 |
| Microlynx Ltd | Information & communication | 2010 |
| Middle Earth Management Ltd | Construction | 2025 |
| Middleton Lettings Limited | Real estate | 2021 |
| Midgley Transport Ltd | Transport & logistics | 2021 |
| Midhope Court (Management) Company Limited | Households | 2006 |
| Midnight Mart Hudds Ltd | Wholesale & retail | 2026 |
| Midtown Construction Limited | Administrative & support | 2024 |
| Midvaris Limited | Wholesale & retail | 2021 |
| Mifan Limited | Hospitality | 2024 |
| Miff Global Concepts Ltd | Wholesale & retail | 2026 |
| MIH Optical Ltd | Health & social care | 2023 |
| Mihomohi Ltd | Wholesale & retail | 2025 |
| Mijc Limited | Administrative & support | 2025 |
| MIK Healthcare Ltd | Wholesale & retail | 2026 |
| Mike Andy Entertainments Limited | Arts & recreation | 2014 |
| Mikes Online Services Limited | Information & communication | 2025 |
| Mikron Theatre Company Limited | Arts & recreation | 1972 |
| Milan Barbers Hudds Ltd | Other services | 2021 |
| Milaro Estates Limited | Construction | 2019 |
| Milco (U.K.) Limited | Wholesale & retail | 1980 |
| Miles (Sales Brokers) Limited | Financial services | 1998 |
| Miles Classic Limited | Wholesale & retail | 2013 |
| Mileva Properties Ltd | Real estate | 2026 |
| Milieu Consulting Limited | Professional & scientific | 2019 |
| Milieu Living Limited | Construction | 2019 |
| Milkwood Artisans Ltd | Manufacturing | 2021 |
| Mill Bank Bloodstock LLP | | 2014 |
| Mill ST Asset Management Limited | Real estate | 2023 |
| Mill Wright Management Limited | Real estate | 2003 |
| Millea Ltd | Administrative & support | 2025 |
| Millenia Developments Limited | Real estate | 2002 |
| Millennium Venture Ltd | Hospitality | 2024 |
| Millerbrown Golf Ltd | Extraterritorial | 2012 |
| Millerbrown Shopfitting Ltd | Extraterritorial | 2012 |
| Millgarth Limited | Manufacturing | 2010 |
| Millgate Group Limited | Financial services | 2020 |
| Milliams Engineering & Management Limited | Manufacturing | 2026 |
| Millies Hair &Beauty Ltd | Other services | 2021 |
| Milligan Health Limited | Health & social care | 2024 |
| Millroyd Homes Limited | Construction | 2019 |
| Mills Electrical Contractors Ltd | Construction | 2023 |
| Millwood Education Ltd | Professional & scientific | 2008 |
| Miln Ltd | Information & communication | 2012 |
| Milne Research Limited | Professional & scientific | 2010 |
| Milner Royd (Woollen Manufacturers) Limited | Manufacturing | 1985 |
| Milner Royd Property Management Company Limited | Real estate | 2012 |
| Milnsbridge Bowling Club,Limited(The) | Arts & recreation | 1921 |
| Milnsbridge Metals Limited | Wholesale & retail | 2022 |
| Milnsbridge Self Storage Ltd | Transport & logistics | 2022 |
| Milnsbridge Stone Ltd | Mining & quarrying | 2023 |
| Milnsbridge Tyres Ltd | Wholesale & retail | 2025 |
| MILO37 Properties Ltd | Real estate | 2024 |
| Mimhiamra Ltd | Health & social care | 2025 |
| Minaris Ltd | Real estate | 2022 |
| Mindful Oasis Limited | Health & social care | 2025 |