| Mindful Pages Ltd | Information & communication | 2023 |
| Mindyourself App Ltd | Information & communication | 2022 |
| Minerva Appointments Ltd | Administrative & support | 2004 |
| Minerva Credit Limited | Administrative & support | 2023 |
| Mini Crazy Limited | Wholesale & retail | 2019 |
| Mini Mix-Huddersfield Limited | Extraterritorial | 1951 |
| Minibus Direct 4U Ltd | Transport & logistics | 2008 |
| Minibus Leasing Limited | Administrative & support | 2011 |
| Minikonsult Diagnostics Limited | Health & social care | 2015 |
| Ministry of Colours Ltd | Manufacturing | 2019 |
| Ministry of Others | Education | 2017 |
| Minster & Openshaw Solutions Ltd | Administrative & support | 2026 |
| Mint Balloon Limited | Professional & scientific | 2010 |
| Mint Projects Limited | Health & social care | 2011 |
| Mintcity Limited | Real estate | 1987 |
| Minute Media Limited | Professional & scientific | 2017 |
| Minux Ltd | Wholesale & retail | 2025 |
| Minyoo Global Ltd | Wholesale & retail | 2021 |
| Miomo Ltd | Wholesale & retail | 2025 |
| Miphone Ltd | Wholesale & retail | 2025 |
| Miracle Within Ltd | Health & social care | 2019 |
| Miraj Dent Ltd | Health & social care | 2018 |
| Miran Property Group Ltd | Real estate | 2026 |
| Mirfeld Store Limited | Wholesale & retail | 2022 |
| Mirror Forest Limited | Manufacturing | 2020 |
| Mirum Homes Limited | Construction | 2021 |
| Mishaalex Lumina Ltd | Wholesale & retail | 2026 |
| Mishall Ltd | Wholesale & retail | 2024 |
| Mishicloth Ltd | Wholesale & retail | 2025 |
| Mishka Jewellery Limited | Manufacturing | 2024 |
| Miss Brown's Cleaning Services Ltd | Administrative & support | 2021 |
| Miss Jinx Property Letting Ltd | Real estate | 2025 |
| Misspelt Ltd | Manufacturing | 2014 |
| Mist Developments Limited | Real estate | 2006 |
| Mister Blue Sky Limited | Hospitality | 2020 |
| MIT Shield Technologies Limited | Professional & scientific | 2024 |
| Mitchell's Ventilation Services Ltd | Energy | 2015 |
| Mitchells UK Holding Ltd | Financial services | 2019 |
| Mitha Properties Ltd | Real estate | 2022 |
| MIX Marketing Limited | Professional & scientific | 2003 |
| MIX Shop Huddersfield Limited | Wholesale & retail | 2024 |
| Mizfar Properties Ltd | Real estate | 2021 |
| MJ Freight Ltd | Transport & logistics | 2026 |
| MJ Naeem Ltd | Health & social care | 2025 |
| MJB Associates (Yorkshire) Limited | Professional & scientific | 2010 |
| Mjb-It Ltd | Information & communication | 2018 |
| MJC Eco-Heating Ltd | Construction | 2013 |
| MJD Property Group Limited | Financial services | 2013 |
| MJJ Consulting Limited | Professional & scientific | 2009 |
| MJL Electrical Contractors Limited | Construction | 2010 |
| MJS Roofing Ltd | Construction | 2011 |
| MJT Advisory Ltd | Professional & scientific | 2020 |
| MJW Jointing Limited | Construction | 2017 |
| MK Engineering Group Ltd | Professional & scientific | 2024 |
| MK Investments Private Limited | Wholesale & retail | 2026 |
| MK Lighting Services Limited | Wholesale & retail | 2008 |
| MK Works Ltd | Manufacturing | 2024 |
| MKF Property Holdings Limited | Real estate | 2025 |
| MKK Pharma Ltd | Health & social care | 2020 |
| Mkmaerialsandcctv Ltd | Information & communication | 2025 |
| MKR Global Ltd | Wholesale & retail | 2026 |
| MKR Optical Limited | Health & social care | 2018 |
| Mkrs (Cawthorne) Limited | Arts & recreation | 2017 |
| Mksw Properties Limited | Real estate | 2025 |
| MLB Construction Ltd | Construction | 2021 |
| MLC Plumbing & Heating Ltd | Construction | 2011 |
| MLR Pensions Administration Ltd | Financial services | 2019 |
| MLS (Halifax) Ltd | Manufacturing | 2026 |
| Mluqman Holding Limited | Financial services | 2025 |
| MM Group Ltd | Wholesale & retail | 2015 |
| MM MED Limited | Health & social care | 2020 |
| MM Taxis Services Ltd | Transport & logistics | 2024 |
| MM VAC Ltd | Health & social care | 2021 |
| Mman Medical Ltd | Health & social care | 2025 |
| Mmaya Limited | Extraterritorial | 2024 |
| Mmbk Consultancy Ltd | Information & communication | 2023 |
| MMC Engineering Ltd | Professional & scientific | 2020 |
| MMC Logistics Ltd | Transport & logistics | 2016 |
| MMK (UK) Limited | Professional & scientific | 2011 |
| MMP2 Limited | Administrative & support | 2021 |
| Mmrz Estates Ltd | Real estate | 2025 |
| MMS Psychiatry Limited | Health & social care | 2020 |
| MMT Yorkshire Ltd | Construction | 2021 |
| MN & SA Property LLP | | 2009 |
| MN Foods Limited | Hospitality | 2023 |
| MN Riders Ltd | Transport & logistics | 2024 |
| MN28 Ltd | Wholesale & retail | 2022 |
| MNH Motors Ltd | Wholesale & retail | 2020 |
| MNH Renovations Ltd | Construction | 2019 |
| Mnkoy Ltd | Health & social care | 2021 |
| Mnomansarwar Ltd | Wholesale & retail | 2026 |
| MNS Property Holdings Limited | Financial services | 2020 |
| MO Builders Ltd | Construction | 2022 |
| MO Commercial Services Limited | Wholesale & retail | 2018 |
| MO JO Carpentry Limited | Construction | 2020 |
| MO Water Compliance Ltd | Water & waste | 2018 |
| Moal Associates Limited | Wholesale & retail | 2021 |
| Moal Properties Ltd | Real estate | 2025 |
| Moalienterprises Ltd | Wholesale & retail | 2026 |
| Moate Acquisitions Limited | Financial services | 2025 |