| Mortgage Advice World Ltd | Professional & scientific | 2014 |
| Mortgage Advisory Network Limited | Administrative & support | 2015 |
| Mortgage Express | Financial services | 1989 |
| Mortgage Leeder Ltd | Financial services | 2021 |
| Mortgage Mates Ltd | Administrative & support | 2025 |
| Mortgage Matters Ltd | Financial services | 2020 |
| Mortgage Safe Limited | Financial services | 2019 |
| Mortgages by Whiteworths Limited | Financial services | 2018 |
| Mortgages Direct (Leeds) Ltd | Financial services | 2023 |
| Mortgagesmiths Limited | Professional & scientific | 2020 |
| Mortham Estates (Trustees) Limited | Extraterritorial | 1999 |
| Morton Brothers Limited | Construction | 2011 |
| Morton Brothers Properties Limited | Real estate | 2025 |
| Morton Brown Consultancy Ltd | Health & social care | 2025 |
| Morton Paddock (Old Tupton) Management Company Limited | Real estate | 2025 |
| Morton Trust Residence Holdings Limited | Real estate | 2003 |
| Mortuary Solutions Limited | Extraterritorial | 2011 |
| Mosa Carpets Ltd | Wholesale & retail | 2022 |
| Mosaic Connect Ltd | Extraterritorial | 2016 |
| Mosaic Connected Communications Ltd | Extraterritorial | 2016 |
| Mosaic Group Limited | Manufacturing | 2003 |
| Mosaic International Limited | Professional & scientific | 2015 |
| Mosaic Marketing Resource Management Ltd | Extraterritorial | 2015 |
| Mosaic Mortgage Management Limited | Financial services | 2003 |
| Mosaic Mortgages Limited | Financial services | 2020 |
| Mosaic MRM Ltd | Extraterritorial | 2015 |
| Mosaic Online Ltd | Extraterritorial | 2011 |
| Mosaic Packaging Limited | Extraterritorial | 2017 |
| Mosaic Print Management (York) Limited | Extraterritorial | 2009 |
| Mosaic Print Management Holdco Limited | Professional & scientific | 2014 |
| Mosaic Print Management Limited | Extraterritorial | 2012 |
| Mosaic Property Renovations Limited | Real estate | 2007 |
| Mosaic Signs Limited | Extraterritorial | 2017 |
| Mosaic Studio Ltd | Manufacturing | 2016 |
| Mosalski Ltd | Financial services | 2024 |
| Mosanil Limited | Real estate | 2025 |
| Moscicki Property Company Ltd. | Construction | 2008 |
| Moseley Cookridge Developments Ltd | Construction | 2025 |
| Moseley Joinery and Construction Ltd | Construction | 2023 |
| Moseley Wood Drive Management Company Limited | Households | 2017 |
| Moseley Wood Management Company Limited | Real estate | 2008 |
| Moshitwa Ltd | Administrative & support | 2016 |
| Mosi-Guard International Limited | Extraterritorial | 2008 |
| Mosop Healthcare Limited | Health & social care | 2025 |
| Moss Alan Properties Ltd | Real estate | 2019 |
| Moss Chair Frames Ltd | Manufacturing | 2019 |
| Moss Gardening Services Ltd | Administrative & support | 2018 |
| Mossap UK Ltd | Wholesale & retail | 2017 |
| Mossederm London Ltd | Administrative & support | 2025 |
| Mossify Ltd | Wholesale & retail | 2025 |
| Mosski Ltd | Health & social care | 2025 |
| Most High Consulting Limited | Professional & scientific | 2015 |
| Most High Properties Limited | Real estate | 2019 |
| Moston Consultants Ltd. | Professional & scientific | 2011 |
| Moston Estates Limited | Real estate | 2017 |
| Moston Interim Resourcing Limited | Administrative & support | 2018 |
| Moston Temporary Resourcing Limited | Administrative & support | 2024 |
| MOT Booking Ltd | Information & communication | 2026 |
| Mota Telecoms Ltd | Construction | 2023 |
| Mote Lodge Investments | Financial services | 2017 |
| Motel Limited | Professional & scientific | 2007 |
| Motel Mansions Ltd | Real estate | 2022 |
| Mother & Sons Properties Ltd | Real estate | 2022 |
| Mother Hubbard's Middleton Ltd | Hospitality | 2024 |
| Mother Hubbard's Street Lane Limited | Hospitality | 2025 |
| Mother Hubbards Cupboards Limited | Manufacturing | 2009 |
| Mothercare UK Limited | Wholesale & retail | 1954 |
| Mothering Menopause Ltd | Professional & scientific | 2023 |
| Mothership (UK) Ltd | Information & communication | 2012 |
| Mother’S Ritual Ltd | Wholesale & retail | 2025 |
| Motia Limited | Administrative & support | 2013 |
| Motion 12 Ltd | Other services | 2018 |
| Motion Entertainment Ltd | Information & communication | 2025 |
| Motion One International Ltd | Wholesale & retail | 2025 |
| Motion Regeneration Ltd | Health & social care | 2023 |
| Motionlease Ltd | Administrative & support | 2025 |
| Motionwear Ltd | Wholesale & retail | 2026 |
| Motiv Productions Ltd | Information & communication | 2013 |
| Motivated Muslim Ltd | Education | 2024 |
| Motive App Limited | Information & communication | 2021 |
| Motobarn Guiseley Ltd | Wholesale & retail | 2026 |
| Motoguru AI Limited | Information & communication | 2024 |
| Motolectro Vehicle Systems Ltd | Manufacturing | 2025 |
| Motonex Ltd | Wholesale & retail | 2026 |
| Motor Marque Limited | Wholesale & retail | 2002 |
| Motor Modz Ltd | Wholesale & retail | 2025 |
| Motor World ( U.K. ) Ltd | Wholesale & retail | 2023 |
| Motorcare Leeds Ltd | Wholesale & retail | 2009 |
| Motorhome Transport Solutions Limited | Transport & logistics | 2020 |
| Motorhouse Cars Limited | Professional & scientific | 2005 |
| Motorhouse of Shipley Limited | Wholesale & retail | 2005 |
| Motorhousecars.Com Limited | Professional & scientific | 2005 |
| Motorhousesalesleeds Ltd | Wholesale & retail | 2025 |
| Motorresolve Limited | Administrative & support | 2010 |
| Motors Cube UK Ltd | Administrative & support | 2015 |
| Motorsync Ltd | Financial services | 2019 |
| Motorvation Properties Ltd | Financial services | 2026 |
| Motospec Performance Ltd | Wholesale & retail | 2021 |
| Motowheel Limited | Wholesale & retail | 2016 |
| Motseosi Care Ltd | Health & social care | 2015 |