| Moat (Plant Hire & Sales) Limited | Administrative & support | 1955 |
| Moat Plant Hire Limited | Other services | 1996 |
| Moaz Limited | Information & communication | 2022 |
| MOB Detailing Limited | Administrative & support | 2023 |
| Mobambo Limited | Wholesale & retail | 2026 |
| Mobdam Ltd | Arts & recreation | 2025 |
| Mobeen Drivers' Limited | Transport & logistics | 2020 |
| Mobeus Income & Growth 2 VCT PLC | Financial services | 2000 |
| Mobeus Income & Growth 4 VCT PLC | Financial services | 1999 |
| Mobile Event Equipment Ltd | Administrative & support | 2012 |
| Mobile Laptop Repair LAB Ltd | Information & communication | 2022 |
| Mobile Shop Leeds Limited | Wholesale & retail | 2021 |
| Mobile Vision Cctv Ltd | Administrative & support | 2023 |
| Mobile World (Leeds) Ltd | Wholesale & retail | 2017 |
| Mobiles 4 U (Leeds) Ltd | Wholesale & retail | 2012 |
| Mobileserv Limited | Wholesale & retail | 2006 |
| Mobility Solutions (Leeds) Limited | Wholesale & retail | 2003 |
| Mobility With Dignity Limited | Manufacturing | 2011 |
| Mobius Connect Limited | Wholesale & retail | 2021 |
| Mobo Contracting Ltd | Administrative & support | 2025 |
| Mobology Ltd | Information & communication | 2011 |
| Mobstr Limited | Information & communication | 2024 |
| MOC Coffee Roastery UK Ltd | Hospitality | 2019 |
| Mocnation Limited | Wholesale & retail | 2025 |
| Mocroft Ltd | Real estate | 2025 |
| Mocuza Limited | Information & communication | 2022 |
| Mod-Con Designs Limited | Construction | 2023 |
| Moda Concessions Ltd | Wholesale & retail | 2016 |
| Moda Flooring of Yorkshire Ltd | Construction | 2025 |
| Moda Medical Limited | Health & social care | 2024 |
| Mode Group Limited | Real estate | 2006 |
| Model Villagers Limited | Administrative & support | 2025 |
| Modern Art Glass Company,Limited | | 1943 |
| Modern Brands Ltd | Wholesale & retail | 2023 |
| Modern China Red Limited | Hospitality | 2016 |
| Modern Comfort Properties Ltd | Households | 2022 |
| Modern Day Developments Ltd | Real estate | 2025 |
| Modern Day Media Ltd | Professional & scientific | 2024 |
| Modern Engineering Limited | Professional & scientific | 2002 |
| Modern Life Enterprises Limited | Arts & recreation | 2009 |
| Modern Living Collective Limited | Real estate | 2026 |
| Modern Project Services Holdings Limited | Financial services | 2017 |
| Modern Salah Fried Chicken Ltd | Hospitality | 2019 |
| Modern Schools (Redcar and Cleveland) Holdings Limited | Administrative & support | 2005 |
| Modern Schools (Redcar and Cleveland) Limited | Administrative & support | 2005 |
| Modern Sushi Ltd | Hospitality | 2024 |
| Modern Trade Limited | Wholesale & retail | 2014 |
| Modernistiq (Barnoldswick) Ltd | Construction | 2021 |
| Modernistiq (Hatfield) Ltd | Construction | 2021 |
| Modernistiq (Hull) Ltd | Construction | 2020 |
| Modernistiq (Layerthorpe) Ltd | Construction | 2020 |
| Modernistiq Advisory Ltd | Real estate | 2020 |
| Modernistiq Development (1) Ltd | Real estate | 2018 |
| Modernistiq Development Ltd | Construction | 2018 |
| Modernistiq Group Ltd | Financial services | 2018 |
| Modernistiq Harrogate Ltd | Construction | 2018 |
| Modernistiq Ventures Ltd | Construction | 2018 |
| Modest Outfits Limited | Wholesale & retail | 2026 |
| Modexpeng Limited | Education | 2016 |
| Modi PS Ltd | Real estate | 2026 |
| Modification & Design Engineering Ltd | Professional & scientific | 2019 |
| Modish Bars Limited | Hospitality | 2022 |
| Modline Limited | Other services | 2024 |
| MODO25 Limited | Information & communication | 2019 |
| Modsely Group Ltd | Wholesale & retail | 2022 |
| Modus Facilities Ltd | Administrative & support | 2021 |
| Moebus Limited | Real estate | 1992 |
| Mofono Media Ltd | Information & communication | 2019 |
| Moga Trade Limited | Wholesale & retail | 2022 |
| Mogga Ltd | Construction | 2026 |
| Moghul Restaurant (Horsforth) Ltd | Hospitality | 2014 |
| Mogul Productions Limited | Information & communication | 2007 |
| MOH RR Ltd | Professional & scientific | 2017 |
| Mohamed Al-Barakati Ltd | Administrative & support | 2025 |
| Mohammed Hasan KRD Ltd | Wholesale & retail | 2025 |
| Mohan Maintenance Ltd | Professional & scientific | 2022 |
| Mohapatra Properties Limited | Real estate | 2022 |
| Mohyeldin Medical Limited | Health & social care | 2025 |
| Moin Moin Ltd | Manufacturing | 2017 |
| Moineagu Ltd | Transport & logistics | 2022 |
| Mojito Consulting Limited | Professional & scientific | 2011 |
| Mojo Executive Consultancy Ltd | Professional & scientific | 2013 |
| Mojo Film & Television Limited | Information & communication | 2007 |
| Mojos Friends Ltd | Hospitality | 2026 |
| Mokksha & Co Ltd | Wholesale & retail | 2026 |
| Moko Property Investment Limited | Real estate | 2024 |
| Mokran UK Ltd | Wholesale & retail | 2025 |
| Mokuso Limited | Wholesale & retail | 2018 |
| Molar Antics Limited | Health & social care | 2026 |
| Molar Properties Ltd | Real estate | 2019 |
| Molecular Energies Limited | Financial services | 2004 |
| Molemanor Limited | Households | 1986 |
| Molfie Ltd. | Transport & logistics | 2009 |
| Moller Pipe Limited | Professional & scientific | 1997 |
| Mollik Wiesner Ltd. | Information & communication | 2025 |
| Molly Rose Creations Ltd | Wholesale & retail | 2024 |
| Molly-Ellie Enterprises Ltd | Health & social care | 2019 |
| Mollyanna Ltd | Hospitality | 2025 |
| Molowe Limited | Wholesale & retail | 2023 |
| Momenta Holdings (PPI) Limited | Administrative & support | 2002 |