| Meghana Psychotherapy Ltd | Health & social care | 2022 |
| Meghankit Limited | Wholesale & retail | 2025 |
| Meghes Ltd | Wholesale & retail | 2024 |
| Meghratrading Limited | Wholesale & retail | 2026 |
| Megson Medical Ltd | Health & social care | 2026 |
| Megus Ltd | Other services | 2022 |
| Meharway UK Ltd | Professional & scientific | 2021 |
| Meher and Sons Limited | Real estate | 2023 |
| Mehta Assets Ltd | Real estate | 2025 |
| Mehta Financial Consultants Limited | Professional & scientific | 2014 |
| Mehta Medical Holdings Ltd | Financial services | 2019 |
| Mehta Properties International Limited | Real estate | 2017 |
| Mehta Tech Limited | Information & communication | 2016 |
| Meisi Step UK Limited | Information & communication | 2024 |
| Mejon Vision Limited | Wholesale & retail | 2022 |
| MEL & Zara Beauty Salon Ltd | Other services | 2026 |
| MEL Kotara Limited | Administrative & support | 2012 |
| Melagro Ltd | Construction | 2018 |
| Melbtrade Ltd | Administrative & support | 2019 |
| Meldi Krupa Ltd | Construction | 2026 |
| Melex Renovations Ltd | Construction | 2014 |
| Melika Limited | Real estate | 2001 |
| Melissa Saunders Limited | Information & communication | 2024 |
| Melissa Time Ltd | Hospitality | 2022 |
| Melodija Consulting Ltd | Information & communication | 2025 |
| Melodious AI Ltd | Information & communication | 2023 |
| Melodix Limited | Information & communication | 2008 |
| Melody Investments Ltd | Real estate | 2019 |
| Melon Kugar Ltd | Administrative & support | 2011 |
| Melrose Stirling Ltd | Real estate | 2022 |
| Melville Projects Limited | Professional & scientific | 2024 |
| Memibo Global Solutions Ltd | Information & communication | 2009 |
| Memorable Buys Limited | Hospitality | 2014 |
| Memore Ltd | Real estate | 2013 |
| Memory Active Limited | Professional & scientific | 2000 |
| Memory Express Limited | Wholesale & retail | 1993 |
| Men's Maintenance Group Ltd | Wholesale & retail | 2012 |
| Menaka Properties Ltd | Real estate | 2020 |
| Menchyjur Ltd | Hospitality | 2023 |
| Mendelsohn Consulting Ltd | Professional & scientific | 2015 |
| Menden Ltd | Health & social care | 2022 |
| Mendip House (Freehold) Limited | Households | 2000 |
| Meneford Enterprises Limited | Real estate | 2019 |
| Menorah Mirielle Limited | Health & social care | 2022 |
| Menrockuk Ltd | Wholesale & retail | 2019 |
| Menscape CIC | Other services | 2023 |
| Mentally Well Schools Limited | Education | 2020 |
| Mentfac Limited | Administrative & support | 2024 |
| Mentu Global Holdings Limited | Education | 2024 |
| Menz Properties Limited | Real estate | 2021 |
| MEO Financial Consultancy Limited | Information & communication | 2014 |
| Meow Media Limited | Professional & scientific | 2023 |
| Mepani Brothers Ltd | Real estate | 2018 |
| Mepani Developments Limited | Real estate | 2015 |
| Mepani Electrical (London) Limited | Construction | 2024 |
| Mepani Electrical Limited | Construction | 1997 |
| Mepani Properties Ltd | Real estate | 2018 |
| Mepani UK Limited | Wholesale & retail | 2007 |
| MER Marine Technologies Ltd | Wholesale & retail | 2022 |
| Mera Solutions Ltd | Information & communication | 2018 |
| Meraki by Bhavika Ltd | Other services | 2022 |
| Merakix Limited | Wholesale & retail | 2024 |
| Merali's (IOM) Limited | Administrative & support | 1998 |
| Merali's Limited | Financial services | 1998 |
| Mercer Newman Limited | Professional & scientific | 2015 |
| Merchant Ivory Productions Limited | Information & communication | 1967 |
| Merco Wholesale Limited | Wholesale & retail | 2026 |
| Mercury 14 Limited | Real estate | 2016 |
| Mercury Creations Limited | Wholesale & retail | 2024 |
| Mercury Infotech Limited | Information & communication | 2024 |
| Mercury Internet School Limited | Education | 2015 |
| Mercury Portfolio Management Services Limited | Real estate | 2019 |
| Mercy Housing Ltd | Health & social care | 2025 |
| Merent Limited | Real estate | 1972 |
| Mereway Ltd | Wholesale & retail | 2026 |
| Meridian Capital Partners Ltd | Financial services | 2022 |
| Meridian Intelligia Solutions Ltd | Information & communication | 2026 |
| Meridius Vantage Ltd | Information & communication | 2026 |
| Merit Wholesale Ltd | Wholesale & retail | 2022 |
| Meritech Solutions Limited | Information & communication | 2025 |
| Meritlane Trading Ltd | Wholesale & retail | 2026 |
| Meritum Freight Ltd | Transport & logistics | 2015 |
| Mermaid of the Sea Ltd | Transport & logistics | 2024 |
| Merna Import and Export Limited | Wholesale & retail | 2017 |
| Merrick Film Limited | Information & communication | 2025 |
| Meru Associates Limited | Professional & scientific | 2001 |
| Mesea Limited | Construction | 2017 |
| Messavi Ltd | Administrative & support | 2025 |
| Messykestrel Ltd | Health & social care | 2025 |
| Meta Horse Ltd | Arts & recreation | 2026 |
| Metaaembro Ltd | Wholesale & retail | 2013 |
| Metacube Software Europe Limited | Information & communication | 2016 |
| Metaflex Limited | Other services | 2022 |
| Metaforge Limited | Information & communication | 2012 |
| Metalico Invest Limited | Real estate | 2023 |
| Metam Management Limited | Real estate | 2025 |
| Metam Properties Limited | Real estate | 2002 |
| Metamesh Technologies Ltd | Information & communication | 2023 |
| Metanoia Ministry | Education | 2019 |
| Metanomos Limited | Information & communication | 2026 |