| Mehar Services Limited | Administrative & support | 2026 |
| Mehboob Rabbani Ltd | Wholesale & retail | 2024 |
| Mehedi Business Limited | Wholesale & retail | 2019 |
| Mehmood Homes Ltd | Real estate | 2025 |
| Mehra & Co Limited | Wholesale & retail | 2001 |
| Mehraj Limited | Other services | 2018 |
| Mehran Automobiles Limited | Administrative & support | 2017 |
| Mehraz Creations Ltd | Professional & scientific | 2024 |
| Mehrish & Co Limited | Professional & scientific | 2024 |
| Mehtadata Limited | Information & communication | 2025 |
| MEI YAN Ltd | Wholesale & retail | 2021 |
| Meimy Ltd | Education | 2023 |
| Meisterr Limited | Wholesale & retail | 2008 |
| Meivar UK Limited | Health & social care | 2024 |
| MEJ Management Services Limited | Professional & scientific | 2018 |
| Mekamsoft Technologies Limited | Information & communication | 2016 |
| Mekbenz Ltd | Information & communication | 2023 |
| Meks Beauty Ltd | Other services | 2026 |
| MEL & B Constuction Ltd | Construction | 2013 |
| Melanin Faith Ltd | Manufacturing | 2026 |
| Melbourne Court RTM Company Limited | Real estate | 2014 |
| Meldi Group of Companies Limited | Wholesale & retail | 2026 |
| Meldi Products Ltd | Wholesale & retail | 2026 |
| Melford and Bros Limited | Other services | 2019 |
| Melio Holdings Ltd | Administrative & support | 2025 |
| Meliora MCA Ltd | Professional & scientific | 2024 |
| Melissa Tuba Sloane Limited | Wholesale & retail | 2025 |
| Melit Ltd | Construction | 2018 |
| Mellison Himley Limited | Other services | 2023 |
| Mellow Cleaners Ltd | Administrative & support | 2025 |
| Mellowmart Ltd | Wholesale & retail | 2026 |
| Mellys Childcare Limited | Health & social care | 2024 |
| Melni Ltd | Construction | 2023 |
| Melodees From Heaven Ltd | Manufacturing | 2023 |
| Melotta Properties Limited | Real estate | 2025 |
| Melson Sport & Promotions Limited | Arts & recreation | 2011 |
| Memaroma Limited | Wholesale & retail | 2026 |
| Member Traders Ltd | Hospitality | 2020 |
| Memento Public Relations Ltd | Professional & scientific | 2024 |
| Memobull Ltd | Extraterritorial | 2017 |
| Memon Holdings Limited | Wholesale & retail | 2026 |
| Memon Trade Hub Limited | Wholesale & retail | 2023 |
| Memorial Heights Energy Consultancy Ltd | Energy | 2024 |
| Memory and Brain Clinic HS Ltd | Health & social care | 2025 |
| Memphis Investments Limited | Real estate | 2022 |
| Mems Taxi Recovery Ltd | Wholesale & retail | 2020 |
| Mendes Consulting Limited | Health & social care | 2018 |
| Mendez Properties Ltd | Real estate | 2025 |
| Menezes Company UNP LDA Limited | Wholesale & retail | 2020 |
| Menhaan Properties Ltd | Real estate | 2022 |
| Menix Boss Ltd | Construction | 2020 |
| Mensark Ltd | Wholesale & retail | 2025 |
| Mental Health Rewired CIC | Health & social care | 2020 |
| Mentmore Estates Limited | Construction | 2017 |
| Mentor Point Youth CIC | Health & social care | 2023 |
| Mentorbuild Limited | Professional & scientific | 2016 |
| Mentyoo C.I.C. | Information & communication | 2021 |
| Menz Club Limited | Wholesale & retail | 2019 |
| Menz Wardrobe Limited | Wholesale & retail | 2025 |
| Meowbyte Limited | Information & communication | 2024 |
| Meplum Pride Ltd | Wholesale & retail | 2025 |
| Meraj Investments Limited | Real estate | 2015 |
| Meraki Creations Limited | Professional & scientific | 2018 |
| Meraki Dwell Ltd | Construction | 2025 |
| Meraki Unique Care Limited | Health & social care | 2018 |
| Merapar Technologies UK Limited | Information & communication | 2018 |
| Mercatura Investments Limited | Real estate | 2013 |
| Merchant Street Limited | Wholesale & retail | 2025 |
| Merchants News Ltd. | Wholesale & retail | 2000 |
| Merci Ventures Limited | Wholesale & retail | 2025 |
| Mercmile Group Ltd | Administrative & support | 2024 |
| Mercmile Properties International Ltd | Real estate | 2024 |
| Mercmile Trading UK Ltd | Wholesale & retail | 2023 |
| Merer Ltd | Transport & logistics | 2020 |
| Mericseller Ltd | Wholesale & retail | 2024 |
| Meridian (UK) Limited | Administrative & support | 2013 |
| Meridian Business School Ltd | Education | 2003 |
| Meridian Equity LLP | | 2006 |
| Meridian Goods Ltd | Wholesale & retail | 2025 |
| Meridian Star Limited | Real estate | 2010 |
| Meridian Trading Co London Limited | Wholesale & retail | 2020 |
| MERIDIAN92 Ltd | Administrative & support | 2022 |
| Meridiem Limited | Hospitality | 2025 |
| Merit Tutors Ltd. | Education | 2017 |
| Merit Tutors Stepney Ltd | Education | 2026 |
| Meritok Trading Limited | Wholesale & retail | 2025 |
| Merka Ltd | Wholesale & retail | 2021 |
| Merritt Science Limited | Professional & scientific | 2002 |
| Merryoaks Property Finance Ltd | Financial services | 2021 |
| Mertons Globe Ltd | Professional & scientific | 2020 |
| Merviq Limited | Education | 2022 |
| Meshals Limited | Wholesale & retail | 2024 |
| Message TV Ltd | Information & communication | 2008 |
| Mesterul Manole Ltd | Information & communication | 2023 |
| Meta Construcion Limited | Manufacturing | 2025 |
| Meta Talent and Services Ltd | Administrative & support | 2024 |
| Meta Traderz Ltd | Wholesale & retail | 2023 |
| Metaclickdata Ltd | Wholesale & retail | 2025 |
| Metacraft Innovation Ltd | Information & communication | 2026 |
| Metadate Ltd | Information & communication | 2025 |