| Melton PUB & Restaurant Limited | Administrative & support | 2017 |
| Melton RD Laundrette Ltd | Other services | 2022 |
| Melton Road Foods Ltd | Hospitality | 2017 |
| Melton Road Management Company Limited | Real estate | 2026 |
| Melton Scissors Ltd | Other services | 2026 |
| Meltonbridge Ventures Ltd | Financial services | 2025 |
| Meltt UK Ltd | Hospitality | 2022 |
| Melvis Career Coaching Ltd | Education | 2021 |
| MEM Fisheries Consultants & Services Limited | Agriculture & fishing | 1995 |
| MEM Installations Limited | Administrative & support | 2002 |
| Meman Bakery 2022 Ltd | Manufacturing | 2022 |
| Member Holdings Limited | Financial services | 1997 |
| Member One Ltd | Administrative & support | 2022 |
| Memdias Global Solutions Ltd | Information & communication | 2025 |
| Memi International Limited | Wholesale & retail | 2003 |
| Memmlee Limited | Health & social care | 2016 |
| Memo Benassi Ltd | Health & social care | 2020 |
| Memon Association Leicester Limited | Other services | 2006 |
| Memon Properties LLP | | 2023 |
| Memonize Ltd | Transport & logistics | 2025 |
| Memorable Pics Ltd | Professional & scientific | 2010 |
| Memree Limited | Wholesale & retail | 2022 |
| Men's Wellness Hub CIC | Public administration | 2025 |
| Menar Group Limited | Wholesale & retail | 2018 |
| Mend and FIX Ltd | Construction | 2025 |
| Mendes & Co Limited | Extraterritorial | 2013 |
| Mendesian Perfumery Ltd | Manufacturing | 2025 |
| Menk Property Ltd | Real estate | 2016 |
| Menkind Barbers Limited | Other services | 2020 |
| Menomen & Nini Ltd | Wholesale & retail | 2026 |
| Menopause Manual Ltd | Information & communication | 2024 |
| Mensley Developments Ltd | Construction | 2020 |
| Mentor Fire Safety Ltd | Administrative & support | 2025 |
| Mentor Software (UK) Limited | Information & communication | 2021 |
| Menu X Limited | Wholesale & retail | 2023 |
| MEP UK LLC Ltd | Real estate | 2023 |
| Mephody Consulting Limited | Information & communication | 2016 |
| MER & DEN Wholesale Ltd | Wholesale & retail | 2014 |
| Meraki Restorations Ltd | Real estate | 2022 |
| Meraki Wellness Ltd | Health & social care | 2023 |
| Merc Assist (Leicester) Limited | Wholesale & retail | 2010 |
| Merc Repairs Leicester Ltd | Wholesale & retail | 2019 |
| Mercantile Enterprise Ltd | Wholesale & retail | 2024 |
| Mercenfeld Properties Ltd | Real estate | 2025 |
| Merchant Aisle Ltd | Wholesale & retail | 2026 |
| Merchant Property Investments Ltd | Real estate | 2017 |
| Merchsmith Ltd | Wholesale & retail | 2018 |
| Mercia & Co. Limited | Wholesale & retail | 2026 |
| Mercian Electric Company Limited | Manufacturing | 1964 |
| Mercie Grace Care Limited | Health & social care | 2014 |
| Mercoledi Homes Ltd | Real estate | 2018 |
| Mercury Assets Ltd | Real estate | 2024 |
| Mercury Care Limited | Health & social care | 2015 |
| Mercury Development Services Ltd | Professional & scientific | 2025 |
| Mercury Power Transmission Limited | Wholesale & retail | 2024 |
| Mercury Wellness Ltd | Health & social care | 2018 |
| Mercy Homecare Ltd | Health & social care | 2025 |
| Mercycity Escapes Ltd | Extraterritorial | 2024 |
| Mere House Property Ltd | Real estate | 2017 |
| Mere Laundrette Ltd | Other services | 2024 |
| Mere Property Holdings Ltd | Real estate | 2021 |
| Mere Property Maintenance Leicester Ltd | Construction | 2022 |
| Mereology Limited | Administrative & support | 2021 |
| Merge Property Services Ltd | Households | 2023 |
| Meridian Accountancy Limited | Professional & scientific | 2024 |
| Meridian Automotive Group Ltd | Wholesale & retail | 2026 |
| Meridian Blinds (Leicester) Limited | Wholesale & retail | 2003 |
| Meridian Robotics Ltd | Financial services | 2026 |
| Meridian Space Command Ltd | Manufacturing | 2023 |
| Merit Talent Ltd | Administrative & support | 2026 |
| Meritocracy Management Consultants Limited | Professional & scientific | 2018 |
| Meritplan Limited | Wholesale & retail | 1981 |
| Meritt Properties Ltd | Real estate | 2024 |
| Merkaba Studios Ltd | Professional & scientific | 2017 |
| Merlin Leisure Pools Limited | Administrative & support | 1979 |
| Merlin Properties Limited | Real estate | 2014 |
| Merlyx Ltd | Other services | 2021 |
| Merrigan & Doherty Holdings Limited | Financial services | 2022 |
| Merriman Property Limited | Construction | 2009 |
| Merrydale & Regency Poultry Limited | Construction | 2014 |
| Merrydays Care Services Ltd | Health & social care | 2023 |
| Merrydown Finance Limited | Financial services | 2006 |
| Merrylees Fabrications Ltd | Manufacturing | 2021 |
| Merrylees Healthcare Ltd | Wholesale & retail | 2022 |
| Merrylees Motors Ltd | Wholesale & retail | 2025 |
| Merryweather Locums Ltd | Health & social care | 2022 |
| Merrywood Bespoke Interiors Limited | Manufacturing | 1999 |
| Merry’S Garden Maintenance Ltd | Administrative & support | 2024 |
| Mersey Keys Ltd | Wholesale & retail | 2025 |
| Mertocom Ltd | Information & communication | 2013 |
| Merton Cleaning Supplies (Leicester) Limited | Professional & scientific | 1994 |
| Merton Group (UK) Limited | Wholesale & retail | 1978 |
| Merus Investments Limited | Professional & scientific | 2019 |
| Merveille D'Une Nuit Ltd | Hospitality | 2022 |
| Merwyn Machado Ltd | Education | 2026 |
| MES Cooling Solutions Ltd | Manufacturing | 2026 |
| Mesh 2023 Limited | Financial services | 2023 |
| Meskar CMC Limited | Professional & scientific | 2023 |
| Messy-Senses Ltd | Education | 2015 |
| Met-Parts Engineering Ltd | Financial services | 2007 |