| Mehak Ventures Limited | Professional & scientific | 2025 |
| Mehat Developments Limited | Construction | 2018 |
| Mehat Properties Ltd | Real estate | 2003 |
| Mehg Ltd | Professional & scientific | 2018 |
| Mehigan Estates Limited | Construction | 2006 |
| Mehigan Events Limited | Hospitality | 2021 |
| Mehran Garage Ltd | Wholesale & retail | 2016 |
| Mehrans Garage 2 Ltd | Wholesale & retail | 2020 |
| Mehsud Store Limited | Wholesale & retail | 2025 |
| Mehtap Bulut Limited | Hospitality | 2024 |
| Meif Esem Small Business Loans LP | | 2017 |
| Meif II - Smaller Loans Esem LP | | 2024 |
| Mein Construction Management and Design Limited | Construction | 2026 |
| Mejjo Security Ltd | Administrative & support | 2025 |
| Mekas Property Group Ltd | Real estate | 2026 |
| Mekaworld UK Limited | Information & communication | 2024 |
| MEL Precision Limited | Manufacturing | 2014 |
| Melanie Sonya Graham Limited | Professional & scientific | 2023 |
| Melanie's Luxe Stays Ltd | Arts & recreation | 2020 |
| Melany Pemberton & Associates Limited | Education | 2026 |
| Melaskn Skincare Ltd | Wholesale & retail | 2024 |
| Melbourne Flooring Contractors Limited | Construction | 1997 |
| Melbourne House Furnishings Limited | Manufacturing | 2001 |
| Melcorpo Property Limited | Real estate | 2020 |
| Meles Consultancy Ltd | Information & communication | 2025 |
| Meletios Mastrodimos Limited | Health & social care | 2021 |
| Melham Group Limited | Professional & scientific | 1949 |
| Melham Holdings Limited | Professional & scientific | 2005 |
| Melham Investments Limited | Professional & scientific | 2005 |
| Meliou Property Lets Ltd | Real estate | 2026 |
| Melius Solutions (Holdings) Limited | Financial services | 2025 |
| Melkine PVT Ltd | Health & social care | 2016 |
| Mellar Technologies Limited | Professional & scientific | 2023 |
| Mellcat Limited | Extraterritorial | 2008 |
| Mellen Developments Limited | Construction | 2016 |
| Mellham Limited | Real estate | 1984 |
| Mellish Rugby Football Club Limited | Arts & recreation | 2007 |
| Mellivora Holdings Limited | Hospitality | 2021 |
| Mellor & Plowright Ltd | Agriculture & fishing | 2025 |
| Mellor Electrical Limited | Construction | 2023 |
| Mellor Oxland LLP | | 2008 |
| Mellor Oxland Trustees Limited | Extraterritorial | 2024 |
| Mellor Personnel Limited | Transport & logistics | 2017 |
| Mellors & Kirk (Nottingham) Ltd | Real estate | 2026 |
| Mellors & Mellors Limited | Construction | 2013 |
| Mellors Developments Limited | Professional & scientific | 2007 |
| Mellors Group (Holdings) Limited | Financial services | 2020 |
| Mellors Group Fantasy Island Holdings Limited | Real estate | 2016 |
| Mellors Group U P NO1 Limited | Arts & recreation | 2021 |
| Mellors Group U P NO2 Limited | Arts & recreation | 2021 |
| Mellors Group U P NO3 Limited | Arts & recreation | 2021 |
| Mellors Group U P NO4 Limited | Arts & recreation | 2021 |
| Mellors Group Urban Playground Holdings Limited | Arts & recreation | 2003 |
| Mellors Mews Limited | Hospitality | 2022 |
| Mellors Newco Limited | Extraterritorial | 2020 |
| Mellors Projects Limited | Construction | 2022 |
| Mellors Rides Limited | Manufacturing | 2024 |
| Mellors Services Ltd | Administrative & support | 2025 |
| Mellows Engineering Limited | Manufacturing | 1998 |
| Melo Golf Ltd | Wholesale & retail | 2026 |
| Melodicity Ltd | Real estate | 2026 |
| Melrose Medical Consultancy Limited | Health & social care | 2016 |
| Melsar Finance Limited | Financial services | 2015 |
| Melt Inc Limited | Real estate | 2017 |
| Meltdown Event Solutions Ltd | Professional & scientific | 2024 |
| Melton Asset Management Limited | Real estate | 2013 |
| Melton Barber Nottingham Ltd | Other services | 2023 |
| Melton Building Supplies Limited | Wholesale & retail | 1999 |
| Melton Court Management Company (Nottingham) Limited | Real estate | 1988 |
| Melton House (West Bridgford) Management Company Limited | Households | 2007 |
| Melton Investments Ltd | Financial services | 2010 |
| Melton Medes Group Limited | Professional & scientific | 1997 |
| Melton Medes Limited | Professional & scientific | 1998 |
| Melton Medes Pension Trustees Limited | Professional & scientific | 1983 |
| Melton Mowbray Air Conditioning Limited | Construction | 2023 |
| Melton Mowbray Dairy Farmers Limited | Professional & scientific | 1979 |
| Melton PJ Ltd | Hospitality | 2023 |
| Melton Road Holdings Limited | Financial services | 2020 |
| Melton Road Limited | Real estate | 2012 |
| Melton Road Properties Limited | Real estate | 2001 |
| Melton Waste & Recycling Ltd | Water & waste | 2009 |
| Melton Wheelie JET Limited | Administrative & support | 2021 |
| Melts Notts Ltd | Hospitality | 2025 |
| Meluka Limited | Transport & logistics | 2025 |
| Melvin Flint Limited | Wholesale & retail | 2002 |
| Memorial at Peninsula Ltd | Health & social care | 2012 |
| Memory Box Studio Limited | Professional & scientific | 2022 |
| Menalia Ltd | Professional & scientific | 2025 |
| Mendpara Ltd | Hospitality | 2017 |
| Mendpara Property Ltd | Real estate | 2025 |
| Menerva Ltd. | Extraterritorial | 2017 |
| Menia Ltd | Wholesale & retail | 2026 |
| Menic Aesthetic Ltd | Other services | 2024 |
| Menopause in the Workplace Ltd | Professional & scientific | 2018 |
| Mensur Ltd | Real estate | 2026 |
| Mental Health Matters International Ltd | Health & social care | 2023 |
| Mental Health Support Ltd | Education | 2018 |
| Mentor Connect CIC | Health & social care | 2026 |
| Mentornet Limited | Energy | 1962 |
| Meosay Limited | Health & social care | 2019 |