| Mehmona Investments Ltd | Real estate | 2025 |
| Mehr Enterprises Ltd | Wholesale & retail | 2022 |
| Mehra & Brothers Limited | Households | 2025 |
| Mehro Investment Limited | Real estate | 2026 |
| Mehro Property Ltd | Real estate | 2024 |
| Mehtah Limited | Transport & logistics | 2022 |
| Mekteb Services Ltd | Education | 2017 |
| Melborn Property Investments LLP | | 2013 |
| Melbourne Nursery Ltd | Education | 2022 |
| Melior L'Amour Ltd | Wholesale & retail | 2025 |
| Meller Flow Trans Limited | Wholesale & retail | 2000 |
| Mellow Dreams Ltd | Wholesale & retail | 2024 |
| Mellow Living Ltd | Wholesale & retail | 2023 |
| Meltdown the Burger Company Ltd | Hospitality | 2025 |
| Meltons Farm Shop Limited | Wholesale & retail | 2017 |
| Memo Mart Ltd | Wholesale & retail | 2025 |
| Memon & Co Enterprise Limited | Wholesale & retail | 2018 |
| Men's Porch CIC | Education | 2026 |
| Menaal Official Ltd | Information & communication | 2022 |
| Meniscus Ltd | Real estate | 2023 |
| Mens Only Tours Limited | Information & communication | 2025 |
| MEP Commercial Management Limited | Professional & scientific | 2016 |
| Mera Gham Limited | Administrative & support | 2018 |
| Meraki Home and Holiday Lets Ltd | Hospitality | 2022 |
| Meraki INK Ltd | Other services | 2024 |
| Merakii Ltd | Wholesale & retail | 2025 |
| Merchantable Quality Limited | Professional & scientific | 1996 |
| Mercurial Healthcare Ltd | Health & social care | 2014 |
| Mercy Mission UK | Other services | 2007 |
| Mereen Enterprises Limited | Health & social care | 2015 |
| Meresbrook Pollard Limited | Professional & scientific | 2011 |
| Meri Yaadain Community Interest Company | Administrative & support | 2019 |
| Meria Propertys Ltd | Real estate | 2025 |
| Meridian Apartments Ltd | Hospitality | 2017 |
| Meridian Colour (UK) Limited | Manufacturing | 2007 |
| Meridian Developments & Sales Limited | Construction | 2022 |
| Meridian Serviced Apartments Ltd | Hospitality | 2024 |
| Meridian Wealth Management Ltd | Financial services | 2005 |
| Meridiantravels.Ai Ltd | Administrative & support | 2026 |
| Merit Educational Limited | Wholesale & retail | 2019 |
| Merit Qrts Limited | Administrative & support | 2017 |
| Merrylee Ltd | Real estate | 2024 |
| Mervyn's Limited | Other services | 2017 |
| Mesam Consulting Ltd | Professional & scientific | 2015 |
| Meta Accountants & Tax Advisors Ltd | Professional & scientific | 2023 |
| Metalcraft Europe Limited | Manufacturing | 2008 |
| Metalcraft Group Ltd | Professional & scientific | 2024 |
| Metalcraft Laser Limited | Manufacturing | 2010 |
| Metalcraft Precision Engineering Limited | Manufacturing | 2016 |
| Metalcraft Projects UK Limited | Financial services | 2013 |
| Metalcraft Roofing Systems Limited | Manufacturing | 2023 |
| Metalgate Leeds Ltd | Manufacturing | 2024 |
| Metatime Limited | Transport & logistics | 2018 |
| Metcalfe Discount Textiles Limited | Wholesale & retail | 1976 |
| Metro Bradford Ltd | Wholesale & retail | 2025 |
| Metro C21 Stores Limited | Wholesale & retail | 2014 |
| Metro C22 Stores Limited | Wholesale & retail | 2018 |
| Metro C23 Stores Limited | Wholesale & retail | 2019 |
| Metro C24 Stores Limited | Wholesale & retail | 2019 |
| Metro C25 Stores Limited | Wholesale & retail | 2022 |
| Metro Goole Limited | Wholesale & retail | 2025 |
| Metro Lanuderette & DRY Cleaners Ltd | Other services | 2013 |
| Metwise Ltd | Wholesale & retail | 2023 |
| MEV Finance Ltd | Administrative & support | 2019 |
| Mexora Living Ltd | Manufacturing | 2026 |
| MEZ47 Limited | Hospitality | 2024 |
| Mezza Catering Ltd | Hospitality | 2016 |
| MF Foods Yorkshire Limited | Wholesale & retail | 2026 |
| MF Furnishings Limited | Wholesale & retail | 2026 |
| MF Gulf Services Ltd | Administrative & support | 2013 |
| MF Joinery Solutions Ltd | Construction | 2022 |
| MF Pharma Ltd | Professional & scientific | 2015 |
| MF Restaurants Ltd | Hospitality | 2016 |
| MF Truck Ltd | Transport & logistics | 2025 |
| MFA BFD Ltd | Transport & logistics | 2025 |
| MFA Traders & Services Ltd | Wholesale & retail | 2023 |
| Mfm&Dpm Ltd | Wholesale & retail | 2024 |
| MFS Properties Group Ltd | Real estate | 2025 |
| MFW Leisure Limited | | 2010 |
| MG Builder Services Ltd | Construction | 2023 |
| MG Midlands Limited | Administrative & support | 2014 |
| MG Property Revoneration Limited | Construction | 2020 |
| MG Speedy Transport Ltd | Transport & logistics | 2024 |
| Mgboko Global Services Ltd | Hospitality | 2026 |
| MGC20 Ltd | Professional & scientific | 2023 |
| MGL Cloud Limited | Information & communication | 2024 |
| MGM Enterprise Ltd | Wholesale & retail | 2026 |
| Mgnt Developments Ltd | Construction | 2025 |
| MGT Tours & Services Ltd | Administrative & support | 2025 |
| Mgts Properties Ltd | Real estate | 2023 |
| MGX Logistics Ltd | Transport & logistics | 2025 |
| MGZ Group Ltd | Construction | 2015 |
| MH & SA Management Ltd | Real estate | 2021 |
| MH Assessors Ltd | Financial services | 2021 |
| MH Bradford Properties Limited | Households | 2021 |
| MH Building & Construction Limited | Construction | 2022 |
| MH Cleaners Ltd | Administrative & support | 2023 |
| MH Corporation Ltd | Wholesale & retail | 2022 |
| MH Driving School Ltd | Education | 2023 |
| MH GAS & Plumbing Ltd | Construction | 2019 |