| Moncotex Ltd | Wholesale & retail | 2015 |
| Moncrieff Property Limited | Real estate | 2023 |
| Moncrieff Resources Ltd | Professional & scientific | 2025 |
| Mondial Plant Limited | Professional & scientific | 1986 |
| Monex Transport Ltd | Transport & logistics | 2023 |
| Money & Legal Point Limited | Wholesale & retail | 2023 |
| Money Greedy Ltd | Wholesale & retail | 2024 |
| Money Labs Ltd. | Information & communication | 2016 |
| Money Matters Commercial Ltd | Financial services | 2017 |
| Money Matters Consultancy Limited | Financial services | 2013 |
| Money Redress Limited | Professional & scientific | 2016 |
| Moneycornershop Limited | Professional & scientific | 2013 |
| Moneyleague Limited | Wholesale & retail | 1996 |
| Moneymatterz Ltd | Financial services | 2024 |
| Monica Consultancy 2025 Ltd | Professional & scientific | 2025 |
| Monika Malkowska Ltd | Professional & scientific | 2022 |
| Monio Limited | Other services | 2012 |
| Monique (UK) Limited | Wholesale & retail | 2004 |
| Monique (UK) Properties Ltd | Real estate | 2025 |
| Monivea Road Holdings Ltd | Financial services | 2024 |
| Monivea Road Limited | Wholesale & retail | 2024 |
| Monkey Brothers Limited | Manufacturing | 2020 |
| Monkey Media Commercials Ltd | Administrative & support | 2024 |
| Monkey Media Productions Ltd | Information & communication | 2013 |
| Monks Rest Gardens Day Nursery Ltd | Health & social care | 2025 |
| Mono Roofing Limited | Construction | 2000 |
| Monocle Health Ltd | Professional & scientific | 2018 |
| Monomita Agarwal Marketing Consultancy Limited | Professional & scientific | 2018 |
| Monoshire Limited | Wholesale & retail | 1984 |
| Monrelle Ltd | Wholesale & retail | 2025 |
| Monsell Grange Management Limited | Households | 2018 |
| Monsell Properties Ltd | Real estate | 2020 |
| Monsier Fragrance Ltd | Wholesale & retail | 2026 |
| Monsieur Skin Ltd | Wholesale & retail | 2025 |
| Monster Chilli Limited | Hospitality | 2024 |
| Mont Blanc Care Solutions Ltd | Administrative & support | 2021 |
| Mont Care Ltd | Health & social care | 2023 |
| Montagu ROE Ltd | Real estate | 2025 |
| Montagu Square (Flat 33B) Limited | Real estate | 2024 |
| Monteros Building Services Ltd | Construction | 2013 |
| Monteros Interiors Ltd | Professional & scientific | 2021 |
| Montez Limited | Administrative & support | 2012 |
| Montgomery (Leics) Ltd | Construction | 2014 |
| Montgomery Sports Management Ltd | Manufacturing | 2014 |
| Montis Landscapes Ltd | Administrative & support | 2024 |
| Montpellier Ltd | Professional & scientific | 2015 |
| Montrent Ltd | Hospitality | 2021 |
| Montreux Investments Ltd | Real estate | 2021 |
| Montreux Marketing Ltd | Manufacturing | 1973 |
| Montrose & Cole Ltd | Extraterritorial | 2016 |
| Monty Enterprises Limited | Financial services | 2020 |
| Monvi Estates Ltd | Real estate | 2026 |
| Monze Limited | Real estate | 2020 |
| Moodie Clubhouse Ltd | Wholesale & retail | 2026 |
| Moodmaster Limited | Professional & scientific | 2008 |
| Moodybrook Financial Services Limited | Financial services | 2000 |
| Mooksh Ayurveda Ltd | Health & social care | 2025 |
| Mooloop Limited | Information & communication | 2004 |
| Moomooda Ltd | Manufacturing | 2022 |
| Moon Crest Supplies Ltd | Wholesale & retail | 2025 |
| Moon House Limited | Construction | 2019 |
| Moonbites Trading Ltd | Wholesale & retail | 2025 |
| Moonchild PVT Ltd | Real estate | 2018 |
| Moonland Ltd | Hospitality | 2026 |
| Moonlight Clothing Ltd | Wholesale & retail | 2015 |
| Moonlight Entertainments Global Ltd | Arts & recreation | 2022 |
| Moonlight Holdings Leicester Ltd | Financial services | 2020 |
| Moonpie Trading Ltd | Wholesale & retail | 2025 |
| Moonpilot Limited | Information & communication | 2022 |
| Moonrise Transport Ltd | Transport & logistics | 2025 |
| Moonshine Liquor Limited | Hospitality | 2020 |
| Moonstar Media Ltd | Information & communication | 2017 |
| Moorbrook Investments Ltd | Real estate | 2025 |
| Moorbrook Properties Ltd | Real estate | 2022 |
| Moorbrook Sourcing Ltd | Real estate | 2026 |
| Moore & Parsons Consultancy Ltd | Administrative & support | 2025 |
| Moore & York Holdings Leicester Limited | Financial services | 2023 |
| Moore & York Lettings (Loughborough) Limited | Real estate | 2010 |
| Moore & York Lettings Ltd | Real estate | 2003 |
| Moore & York Limited | Real estate | 2002 |
| Moore and York (Loughborough) Limited | Real estate | 2005 |
| Moore Enterprises Leicester Ltd | Manufacturing | 2014 |
| Moorewood Machinery Limited | Agriculture & fishing | 2016 |
| Moorfield Site Services Ltd | Administrative & support | 2020 |
| Moorhouse Properties & Lettings Limited | Real estate | 2016 |
| Moorley's Joinery Ltd | Construction | 2025 |
| Moorschild Limited | Financial services | 2019 |
| Moosa Enterprise Ltd | Wholesale & retail | 2012 |
| Moosa Limited | Real estate | 2003 |
| Mooseheads in the Community C.I.C. | Education | 2014 |
| Moov Reformer Studio Limited | Arts & recreation | 2026 |
| MOP Magic Limited | Administrative & support | 2024 |
| Mopani Investments Limited | Real estate | 2022 |
| Morad Educational Services Limited | Public administration | 2024 |
| Moradi Transport Ltd | Transport & logistics | 2024 |
| Moral Compass Capital Limited | Arts & recreation | 2024 |
| Mordiford Integrity Ltd | Transport & logistics | 2018 |
| More Clothing Ltd | Wholesale & retail | 2017 |
| More Executive Recruitment Ltd | Administrative & support | 2024 |
| More Homeware Ltd | Wholesale & retail | 2023 |