| Mollitiam Aviation Training Services Ltd | Transport & logistics | 2025 |
| Moments of Power Ltd | Professional & scientific | 2023 |
| Momentum Plans Ltd | Other services | 2025 |
| MOMENTUM002 Limited | Arts & recreation | 2010 |
| Momo Running Limited | Arts & recreation | 2024 |
| Momocha Kitchen Ltd | Hospitality | 2025 |
| Monahen Care and Support Limited | Health & social care | 2013 |
| Monarch Management Ltd | Real estate | 2023 |
| Monarch Sourcing Ltd | Administrative & support | 2023 |
| Money Asset Corp Ltd | Financial services | 2022 |
| Monii Limited | Financial services | 2020 |
| Moniteye Limited | Administrative & support | 2010 |
| Monkeyz Consulting Limited | Information & communication | 2011 |
| Montagu's Design & Build Ltd | Construction | 2023 |
| Montagu's Holdings Limited | Financial services | 2024 |
| Montagu's of Leicester Limited | Wholesale & retail | 2013 |
| Montague Estates Property (UK) Ltd | Real estate | 2026 |
| Monti Rozano Ltd | Wholesale & retail | 2023 |
| Moody and Taylor Properties Limited | Real estate | 2000 |
| Mooli Limited | Administrative & support | 2002 |
| Moon and Back Estate Limited | Real estate | 2025 |
| Moon and Back Holding Limited | Financial services | 2022 |
| Moonrise Consulting Ltd | Professional & scientific | 2020 |
| Moorcourt Developments Limited | Health & social care | 1990 |
| Moore Herbert & Moore Limited | Real estate | 2021 |
| Moorlane Stores Limited | Wholesale & retail | 2014 |
| Moova Mobilise (UK) Limited | Information & communication | 2026 |
| Morag Thomson Limited | Professional & scientific | 2010 |
| More Foods Ltd | Wholesale & retail | 2021 |
| More-Me Ltd | Wholesale & retail | 2021 |
| Morley Automotive Limited | Wholesale & retail | 2019 |
| Morning Sunshine Holdings Limited | Financial services | 2025 |
| Morningside (Leicester) Limited | Wholesale & retail | 1988 |
| Morningside Holdings Ltd | Financial services | 2015 |
| Morris Electronics Ltd | Construction | 2006 |
| Morris Industrial Ltd | Manufacturing | 2023 |
| Morte Point Limited | Real estate | 2004 |
| Mortimer's Cars Limited | Wholesale & retail | 2021 |
| Mosaic Wellbeing Limited | Professional & scientific | 2005 |
| Moss Project & Programme Management Limited | Professional & scientific | 2014 |
| Moss Solicitors (Loughborough) Limited | Professional & scientific | 2026 |
| Moss Taylor Limited | Construction | 2016 |
| Moss Taylor Properties Limited | Real estate | 2017 |
| MOT First M S Ltd | Wholesale & retail | 2013 |
| Moti ME Ltd | Manufacturing | 2021 |
| MOTIV8 International Ltd | Education | 2003 |
| Motivational Speakers Agency Limited | Administrative & support | 2021 |
| Moto Diagnostics Ltd | Wholesale & retail | 2013 |
| Motorfit Limited | Wholesale & retail | 2012 |
| Mott & Co. Limited | Construction | 2006 |
| Mount's Bay Fish Limited | Agriculture & fishing | 2021 |
| Mountain IOT Ltd | Information & communication | 2017 |
| Mountainsandmoor Ltd | Education | 2021 |
| Mountfields Lodge School | Education | 2012 |
| Mountsorrel Booze Limited | Wholesale & retail | 2010 |
| Mountsorrel Car Sales Ltd | Wholesale & retail | 2019 |
| Mountsorrel Chippy Limited | Hospitality | 2021 |
| Mountsorrel Classics Limited | Wholesale & retail | 2021 |
| Mountsorrel GAS Appliance Services Limited | Construction | 1998 |
| Mountsorrel WAR Memorials Trust Limited | Health & social care | 2002 |
| Move. Fitness Club Limited | Arts & recreation | 2024 |
| Movement Clinics Loughborough Limited | Other services | 2024 |
| Moving Matters Property Ltd | Real estate | 2024 |
| MOY Services Ltd | Real estate | 2023 |
| MP Rahi Property Limited | Real estate | 2016 |
| MPI 10 Ltd | Real estate | 2022 |
| MPL Investments (Leicester) Limited | Financial services | 2025 |
| Mpress Solutions Limited | Wholesale & retail | 2018 |
| MR and MRS Keates Ltd | Hospitality | 2025 |
| MR B Upvc Repairs Ltd | Manufacturing | 2024 |
| MR Midland Maintenance Ltd | Administrative & support | 2023 |
| MR P Thomson Limited | Professional & scientific | 2003 |
| MR S.C. Tandon Limited | Health & social care | 2009 |
| MR Taper Barbers Ltd | Other services | 2026 |
| MRJ Electrical Ltd | Professional & scientific | 2019 |
| MS Asset Management Ltd | Professional & scientific | 2016 |
| MS Property Loughborough Ltd | Real estate | 2026 |
| MS Scientific Services Ltd | Professional & scientific | 2026 |
| MS Town Planning Limited | Professional & scientific | 2014 |
| Msbt Properties Limited | Real estate | 2020 |
| MSC Music Limited | Wholesale & retail | 2003 |
| Msht Estates Ltd | Construction | 2021 |
| MSK Aura Limited | Wholesale & retail | 2025 |
| MSK Covertech Limited | Professional & scientific | 1993 |
| MSN Property Investment Limited | Real estate | 2013 |
| MSR Consultancy Ltd | Administrative & support | 2020 |
| Msucleaning Limited | Administrative & support | 2016 |
| MTC Rental Property Ltd | Real estate | 2024 |
| MTH Plumbing and Heating Contracts Limited | Construction | 2020 |
| Mubu Hairdressing Limited | Other services | 2012 |
| Mucklin Wood Studio Limited | Professional & scientific | 2022 |
| Mucky Duck Promotions Limited | Arts & recreation | 2019 |
| Muga-Uk Ltd | Administrative & support | 2008 |
| Mugal Lounge Ltd | Hospitality | 2025 |
| Muggins Pottery Limited | Arts & recreation | 1976 |
| Mulholland Energy Solutions Limited | Extraterritorial | 2013 |
| Mullar Property Investments Ltd | Real estate | 2025 |
| Multimedix Holdings Limited | Financial services | 2014 |
| Munim's Property Investments Ltd | Real estate | 2026 |
| Munim's Property Limited | Real estate | 2023 |