| Melville Property (Scotland) Limited | Financial services | 2017 |
| Melville Property Development Limited | Construction | 2015 |
| Melville Property Limited | Real estate | 2012 |
| Melville Sikorsky CA Limited | Other services | 2026 |
| Melville Sikorsky Challenge Accelerator Limited | Professional & scientific | 2026 |
| Melville Strachan Limited | Professional & scientific | 2017 |
| Melville Street Investments (NO. 3) Limited | Financial services | 2020 |
| Melville's Fruit Beers Limited | Manufacturing | 2011 |
| Melwood Estate LP | | 2015 |
| Melword Group LP | | 2015 |
| Mema Group Construction Ltd | Wholesale & retail | 2025 |
| Memar Design and Development Ltd | Real estate | 2007 |
| Membrane Sensor Systems Limited | Manufacturing | 2022 |
| Membrant LP | | 2014 |
| Memcrypt Limited | Information & communication | 2021 |
| Memento Pictures Ltd | Information & communication | 2024 |
| Memo Systems LP | | 2015 |
| MEMO9RD Ltd | Hospitality | 2025 |
| Memor Recruitment Ltd | Administrative & support | 2024 |
| Memory Lane Entertainment Ltd | Arts & recreation | 2025 |
| Memory Technology L.P. | | 2012 |
| Memphis Point LP | | 2002 |
| Mena Enterprises Co Ltd | Wholesale & retail | 2020 |
| Mena Investment Partners Founder GP LLP | | 2019 |
| Mena Investment Partners I Founder LP | | 2019 |
| Mendelssohn Limited Partnership | | 2007 |
| Mendmesh Ltd | Information & communication | 2026 |
| Mendoline Capital LP | | 2013 |
| Mene Papiru LP | | 2017 |
| Mensa Structural Solutions Ltd | Construction | 2026 |
| Mensor Cost Consultants Ltd | Professional & scientific | 2026 |
| Mental Health Law Limited | Health & social care | 2015 |
| Mentesana Ltd | Health & social care | 2017 |
| Mentone Energy Consultancy Limited | Professional & scientific | 2019 |
| Mentor M.A. (Scotland) Limited | Real estate | 1987 |
| Menture Trade LP | | 2012 |
| Menzies Accountants Limited | Professional & scientific | 2005 |
| Menzies Parcels Limited | Transport & logistics | 1999 |
| Menzies Wholesale Limited | Professional & scientific | 1987 |
| Menzies Worldwide Distribution Limited | Professional & scientific | 1992 |
| Menzo Tech Ltd | Information & communication | 2022 |
| MEO Capitalpartners Ltd | Financial services | 2026 |
| MEO Commerce Ltd | Wholesale & retail | 2026 |
| MEO Property Investment Ltd | Households | 2026 |
| Meophan Investment SP | | 2003 |
| Meow Commercial Photography Studios Ltd | Arts & recreation | 2011 |
| MEP 3 FP GP LLP | | 2026 |
| MEP 3 FP LP | | 2026 |
| MEP Cost Consulting Limited | Professional & scientific | 2011 |
| MEP II FP LP | | 2018 |
| MEP II LP | | 2018 |
| MEP III FLP LP | | 2022 |
| MEP IV FP GP LLP | | 2016 |
| MEP IV FP LP | | 2016 |
| MEP V FP GP LLP | | 2021 |
| MEP V FP LP | | 2021 |
| Meradel United LP | | 2015 |
| Meraki Services LP | | 2016 |
| Merakigai LP | | 2025 |
| Meral Trading & Co | | 1992 |
| Merc Life Group LP | | 2016 |
| Mercat Tours International Limited | Administrative & support | 2001 |
| Mercat Tours Limited | Administrative & support | 2001 |
| Mercel Ltd | Professional & scientific | 2021 |
| Mercer Energy Services Ltd | Professional & scientific | 2023 |
| Mercer PE Fund II Founder Partner L.P. | | 2006 |
| Mercer PE Fund II Scotland LP | | 2006 |
| Merchant Anglo (Amazon Park) Limited Partnership | | 2008 |
| Merchant Anglo (Amazon Park) Property Holdings Limited | Construction | 2008 |
| Merchant Capital Limited | Professional & scientific | 2014 |
| Merchant Capital West END Limited | Extraterritorial | 2015 |
| Merchant City Hotels Limited | Hospitality | 2019 |
| Merchant City Mortgages Ltd | Financial services | 2018 |
| Merchant City Property Limited | Hospitality | 2018 |
| Merchant Idea LP | | 2015 |
| Merchant Leisure Limited | Financial services | 2014 |
| Merchant Leisure Property Investments Ltd | Real estate | 2023 |
| Merchant LP | | 2014 |
| Merchant Tour Co Limited | Administrative & support | 2024 |
| Merchant Wisdom LP | | 2015 |
| Merchants Alliance LP | | 2016 |
| Merchants Catering Limited | Hospitality | 2019 |
| Merchants' Hall Limited | Other services | 1999 |
| Merchiston Castle School | Education | 1926 |
| Merchiston Construction Limited | Real estate | 1981 |
| Merchiston Enterprises Limited | Other services | 1983 |
| Merchiston International Limited | Education | 2016 |
| Merchiston Medical Limited | Health & social care | 2015 |
| Merchiston Solutions LP | | 2012 |
| Mercia Evolution Carry Partner LP | | 2025 |
| Mercit SP | | 2004 |
| Mercuna Developments Limited | Information & communication | 2016 |
| Mercuri CIP GP Limited | Administrative & support | 2017 |
| Mercuri CIP LP | | 2017 |
| Mercuri II CIP GP LLP | | 2023 |
| Mercuri II CIP LP | | 2023 |
| Mercuri II Co-Invest LP | | 2023 |
| Mercuri Management LP | | 2011 |
| Mercuri SPV CIP LP | | 2025 |
| Mercuri SPV GP LLP | | 2025 |