| Moate Commercial Properties Limited | Real estate | 2020 |
| Moate Residential Limited | Real estate | 2024 |
| Mobile Edge UK Limited | Information & communication | 2008 |
| Moburg Investments Limited | Real estate | 2019 |
| Mockstars (UK) Ltd | Arts & recreation | 2012 |
| Mocro UK Ltd | Wholesale & retail | 2025 |
| Modarab Autocenter Ltd | Wholesale & retail | 2023 |
| Modena Rosso Limited | Wholesale & retail | 2003 |
| Modern Handling Services Limited | Manufacturing | 1959 |
| Modern Luxury Living Ltd | Real estate | 2025 |
| Moderna Mots Holdings Limited | Financial services | 2025 |
| Moderna Mots Limited | Wholesale & retail | 2003 |
| Moderna Mots Property Holdings Limited | Real estate | 2014 |
| Modestly Ripened Ltd | Wholesale & retail | 2024 |
| Modfacto Ltd | Information & communication | 2025 |
| Mods & Rockers Ltd | Arts & recreation | 2014 |
| Mods Family Estates Ltd | Real estate | 2025 |
| Modular by SBU Limited | Wholesale & retail | 2023 |
| Mohsem Consultancy Ltd | Health & social care | 2025 |
| Moizer Psychology Ltd | Health & social care | 2019 |
| Mojeeb Latif Mpharm Ltd | Professional & scientific | 2015 |
| Moka Traders Ltd | Construction | 2025 |
| Molar Ltd | Health & social care | 2020 |
| Moldgreen 1 Ltd | Hospitality | 2019 |
| Moldgreen Bakery Ltd | Wholesale & retail | 2025 |
| Mollie Milligan Audio Ltd | Information & communication | 2023 |
| Molly Kate Consulting Limited | Information & communication | 2026 |
| Molpin Limited | Information & communication | 2011 |
| Momento App Ltd | Information & communication | 2026 |
| Momentous Football Academy Ltd | Education | 2020 |
| Moments Wellness Ltd | Health & social care | 2025 |
| Mona's Home Kitchen Ltd | Hospitality | 2025 |
| Money in Minutes Holdings Limited | Financial services | 2023 |
| MONI786 Ltd | Health & social care | 2015 |
| Monica Rosso Limited | Wholesale & retail | 2021 |
| Monkev Limited | Real estate | 2021 |
| Monochrome Quality Services Ltd | Professional & scientific | 2023 |
| Monolith Properties Limited | Real estate | 2019 |
| Monopoly Holdings Limited | Real estate | 2017 |
| Montgomery (Engravers) Limited | Manufacturing | 1965 |
| Montis Management Services Limited | Professional & scientific | 2016 |
| Montpharma Ltd | Health & social care | 2022 |
| MOO Magic Limited | Manufacturing | 2025 |
| MOOD4FOOD Ltd | Hospitality | 2024 |
| Moolou Media Ltd | Information & communication | 2019 |
| Moon ET AL. Ltd | Wholesale & retail | 2023 |
| Moon Huddersfield Cars Ltd | Transport & logistics | 2019 |
| Mooney Photo Limited | Professional & scientific | 2014 |
| Moonjuice Ltd | Health & social care | 2016 |
| Moorcroft Business Group Ltd | Professional & scientific | 2017 |
| Moorcroft Consulting Group Ltd | Professional & scientific | 2017 |
| Moorcroft Mergers and Acquisitions (M&A) Ltd | Professional & scientific | 2017 |
| Moorcroft Property Group Limited | Other services | 2018 |
| Moorcroft VPM Limited | Real estate | 2015 |
| Moorlands Flat Management Company Limited(The) | Real estate | 1984 |
| Moorside Garages Limited | Wholesale & retail | 1982 |
| Moose Storage Limited | Transport & logistics | 2007 |
| Mopane Enterprises Ltd | Professional & scientific | 2011 |
| Mopkings Cleaning Services Limited | Administrative & support | 2024 |
| Moral Security Services Limited | Administrative & support | 2020 |
| More Than Just Admin Ltd | Financial services | 2012 |
| Moreco Residentials Ltd | Health & social care | 2025 |
| Morehouse Operations and Management Limited | Information & communication | 2026 |
| Moreish International Ltd | Wholesale & retail | 2016 |
| Moresareen Ltd | Health & social care | 2022 |
| Morphogenic Labs Ltd | Manufacturing | 2023 |
| Morris Family Investments Ltd | Financial services | 2015 |
| Mortgage Elite Limited | Financial services | 2023 |
| Mortgage Hand Limited | Financial services | 2020 |
| Mortgages & Financial Solutions Ltd | Financial services | 2018 |
| Morville Roofing Ltd | Construction | 2025 |
| MOS Motors Ltd | Wholesale & retail | 2026 |
| Mosaic Digital Consulting Limited | Information & communication | 2020 |
| Mosaic North Limited | Information & communication | 2007 |
| Moses & Good Holdings Ltd | Construction | 2021 |
| Mosi Brown Limited | Administrative & support | 2023 |
| Mosley Contracting Limited | Agriculture & fishing | 2019 |
| Mosox Ltd | Real estate | 2021 |
| Moss Brow Farm Management Company Limited | Real estate | 2004 |
| Moss Prestige Ltd | Wholesale & retail | 2021 |
| MOT Huddersfield Ltd | Wholesale & retail | 2024 |
| MOT L.A.B Ltd | Wholesale & retail | 2019 |
| Motiq Digital Ltd | Professional & scientific | 2026 |
| Motor Salvage Solutions Ltd | Wholesale & retail | 2023 |
| Motor Vehicle Services Limited | Wholesale & retail | 2002 |
| Motorcycle Storehouse Limited | Wholesale & retail | 2007 |
| Motorcycleraceparts Limited | Wholesale & retail | 2026 |
| Moughal Properties Ltd | Real estate | 2024 |
| Mount House Property Ltd | Real estate | 2019 |
| Mount Pleasant (Marsden) Management Company Limited | Households | 2025 |
| Mount Pleasant Projects Ltd | Professional & scientific | 2023 |
| Mount Preschool Ltd | Education | 2014 |
| Mount Quarry Woodland Conservation Ltd | Other services | 2021 |
| Mount School Huddersfield(The) | Professional & scientific | 1978 |
| Mount View Farm Limited | Agriculture & fishing | 2005 |
| Mountain Projects Limited | Construction | 1998 |
| Mountain Scott Consultancy Limited | Professional & scientific | 2013 |
| Mountain Trailers Limited | Administrative & support | 2016 |
| Mountjoy Properties Limited | Construction | 2003 |
| Mousa Abdelhady Ltd | Health & social care | 2026 |