| Media Direct Solution LP | | 2015 |
| Media Education CIC | Information & communication | 2016 |
| Media Global Services L.P. | | 2012 |
| Media Group Development L.P. | | 2015 |
| Media Group LP | | 2017 |
| Media Harmony LP | | 2020 |
| Media Harmony Publishing LP | | 2020 |
| Media Jess LP | | 2023 |
| Media Musketeer Ltd | Information & communication | 2016 |
| Media Network International LP | | 2016 |
| Media Partners Company | | 1994 |
| Media Solution Group LP | | 2024 |
| Media Spark Ltd | Professional & scientific | 2012 |
| Media Systems Technologies Co. | | 1995 |
| Media Traffic Limited | Information & communication | 2008 |
| Media-Tech Pro LP | | 2017 |
| Mediafabrik Ltd | Information & communication | 2017 |
| MEDIAHAU5 Limited | Professional & scientific | 2013 |
| Medianote Management LP | | 2014 |
| Mediastar Promotions LP | | 2014 |
| Mediavilla International LP | | 2021 |
| Medical and Marketing Solutions LP | | 2013 |
| Medical Centres Scotland 2000 Limited | Construction | 1997 |
| Medical Centres Scotland Limited | Construction | 2003 |
| Medical Journey Limited | Information & communication | 2026 |
| Medical LAB Instrument and Reagent L.P. | | 2015 |
| Medical Retina Limited | Health & social care | 2014 |
| Medical Services AS Ltd | Health & social care | 2019 |
| Medical Writers Ltd | Professional & scientific | 2021 |
| Medicann (Scotland) Limited | Health & social care | 2025 |
| Medicare Surgicals Ltd | Wholesale & retail | 2025 |
| Medici Advisors Ltd | Professional & scientific | 2009 |
| Medicine Collection Limited | Wholesale & retail | 2019 |
| Medicis Media LP | | 2020 |
| Medident Consulting Corp. LP | | 2011 |
| Medit Impex Trade LP | | 2013 |
| Meditera Ltd | Hospitality | 2020 |
| Mediterra Capital Partners GP, LP | | 2011 |
| Mediterranean Coast Ltd | Hospitality | 2026 |
| Mediterranean Host Limited | Administrative & support | 2007 |
| Mediterranean Wholesalers Ltd | Wholesale & retail | 2025 |
| Medium Scale Wind NO.2 Limited | Energy | 2011 |
| Mediumtrade LP | | 2017 |
| Medius Cortex Ltd | Information & communication | 2024 |
| Mediva Group LP | | 2016 |
| Mediwound UK Limited | Extraterritorial | 2004 |
| Medjah Limited | Administrative & support | 2018 |
| Medlaw Properties Limited | Administrative & support | 1971 |
| Medline Shipmanagement LP | | 2013 |
| Medmim Architecture Ltd | Professional & scientific | 2024 |
| Mednex Group LP | | 2016 |
| Mednourish Dynamics Ltd | Extraterritorial | 2025 |
| Medo Cafe Edin Ltd | Hospitality | 2024 |
| Medobird LP | | 2006 |
| Medoc Locums Ltd | Health & social care | 2017 |
| Medquest Group Limited | Information & communication | 1929 |
| Medsafve Limited | Health & social care | 2017 |
| Medsculpt Partners Ltd | Extraterritorial | 2025 |
| Medsource UK Ltd | Information & communication | 2016 |
| Medterra Ltd | Professional & scientific | 2015 |
| Medtronic Trading LP | | 2018 |
| Medusa Broughton Limited | Other services | 2020 |
| Medusa ER Ltd | Other services | 2023 |
| Medusa Hanover Ltd | Other services | 2020 |
| Medusa Musselburgh Limited | Other services | 1999 |
| Medusa Stockbridge Ltd | Other services | 2017 |
| Medusa Training Limited | Other services | 2012 |
| Medway Care Services Limited | Administrative & support | 2013 |
| Medway Chase Services Ltd | Health & social care | 2014 |
| Meehan Ltd | Real estate | 2022 |
| Meerab Holdings Limited | Real estate | 2022 |
| Meet Molecule LP | | 2015 |
| Meetville LP | | 2016 |
| MEG Hanna Consultancy Limited | Professional & scientific | 2026 |
| Mega Assistance LP | | 2016 |
| Mega Azure LP | | 2016 |
| Mega Block Construction Ltd | Construction | 2025 |
| Mega Care Solutions Ltd | Professional & scientific | 2025 |
| Mega Castro Ltd | Hospitality | 2026 |
| Mega Enterprise LP | | 2017 |
| Mega Games International LP | | 2016 |
| Mega Gold Ltd | Construction | 2014 |
| Mega Leisure (Scotland) Limited | Arts & recreation | 2000 |
| Mega Project LP | | 2012 |
| Mega Star Group LP | | 2015 |
| Mega Synergy LP | | 2015 |
| Mega Talent Ventures LP | | 2015 |
| Megacircle LP | | 2015 |
| Megalan Trade LP | | 2011 |
| Megalead L.P. | | 2013 |
| Megaline Business LP | | 2022 |
| Megaline Export LP | | 2014 |
| Megaline Power LP | | 2014 |
| Megalit Impex LP | | 2012 |
| Megalux Technics L.P. | | 2015 |
| Megan Cunningham PR Ltd | Professional & scientific | 2025 |
| Megan Fraser Coaching Ltd | Administrative & support | 2021 |
| Meganic Group Ltd | Professional & scientific | 2020 |
| Megaprix LP | | 2014 |
| Megatex Inter LP | | 2014 |