| Mercurius AMS UK Ltd | Wholesale & retail | 2022 |
| Mercurius Corporation LP | | 2015 |
| Mercurius Development LP | | 2015 |
| Mercury Active LP | | 2016 |
| Mercury Business LP | | 2015 |
| Mercury Environmental Systems 1 Ltd | Agriculture & fishing | 2021 |
| Mercury Environmental Systems Ltd | Agriculture & fishing | 2020 |
| Mercury Event Services (Edinburgh) Ltd | Information & communication | 2013 |
| Mercury Expert LP | | 2016 |
| Mercury PVT. Ltd | Wholesale & retail | 2024 |
| Mercury Quest LP | | 2015 |
| Mercury Trade LP | | 2012 |
| Mercury Trading LP | | 2015 |
| Mercury Trans LP | | 2015 |
| Mercury United LP | | 2015 |
| Mercy Corps Europe | Health & social care | 2000 |
| Mercycare Edinburgh Limited | Health & social care | 2026 |
| Merdex Today LP | | 2017 |
| Mere Complexities Ltd | Information & communication | 2020 |
| Merecrest Limited | Transport & logistics | 2002 |
| Meredith & Lucas Ltd | Professional & scientific | 2023 |
| Mergo Group LP | | 2016 |
| Meribel (UK) Limited | Construction | 2002 |
| Merida Trade L.P. | | 2019 |
| Meriden Trading LP | | 2016 |
| Merident Trading LP | | 2012 |
| Meridia Ltd | Information & communication | 2024 |
| Meridian Corporate LP | | 2017 |
| Meridian Enterprise Holdings Limited | Financial services | 2025 |
| Meridian Psychological Services and Consulting Ltd | Health & social care | 2026 |
| Meridian Salmon Group Limited | Professional & scientific | 2010 |
| Meridian Solution LP | | 2017 |
| Meridiana LP | | 2016 |
| Meridiani Trading LP | | 2016 |
| Meridon Export L.P. | | 2015 |
| Merienda Limited | Wholesale & retail | 2018 |
| Merigold Solutions LP | | 2015 |
| Merilla Management LP | | 2017 |
| Meristar, LP | | 2012 |
| Merit Point Ltd | Health & social care | 2025 |
| Merit Property Solutions Ltd | Construction | 2021 |
| Merith Holdings Limited | Real estate | 2021 |
| Merith Three Ltd | Hospitality | 2021 |
| Merith Two Ltd | Hospitality | 2021 |
| Meritum Height Works Ltd | Construction | 2015 |
| Merizon, LP | | 2012 |
| Merkelis Group LP | | 2016 |
| Merkland Estate Development Ltd | Real estate | 2009 |
| Merkland Family Trustees Limited | Other services | 2021 |
| Merkland Family Trustees NO. 2 Limited | Other services | 2022 |
| Merlin & Morgan & Associates | | 1992 |
| Merlin Consultancy (Global) Ltd | Professional & scientific | 2014 |
| Merlin Finance LLP | | 2014 |
| Merlinton Systems LP | | 2011 |
| Merlinton Universal LP | | 2015 |
| Merlyn Special Limited Partnership | | 2019 |
| Mermaid Takeaway Ltd. | Wholesale & retail | 2011 |
| Merman Conservation Expeditions Ltd | Professional & scientific | 2023 |
| Merman Scotland - Disability Benefits Limited | Information & communication | 2024 |
| Merman Television Scotland Limited | Information & communication | 2023 |
| Mermeros Management LP | | 2016 |
| Mern Capital LP | | 2016 |
| Mernwood Sales LP | | 2014 |
| Merolex LP | | 2012 |
| Merolle LP | | 2003 |
| Mero’S CUT Ltd | Other services | 2023 |
| Merridale Industries LP | | 2015 |
| Merrill Lynch Equity Scotland Limited Partnership | | 2012 |
| Merrill Lynch Liquidity Portfolio,L.P. | | 2001 |
| Merrill Lynch Scotland Finance II Limited Partnership | | 2004 |
| Merrill Lynch Scotland Finance III Limited Partnership | | 2004 |
| Merrill Lynch Scotland Finance Limited Partnership | | 2004 |
| Merrill Solutions Ltd | Professional & scientific | 2015 |
| Merrington Trade LP | | 2014 |
| Merryflatts Ltd | Arts & recreation | 2017 |
| Merryhome Properties Ltd | Real estate | 2017 |
| Merryvale Limited | Transport & logistics | 2000 |
| Mersin Software Limited | Information & communication | 2013 |
| Mertbury Trade LP | | 2014 |
| Mertille LP | | 2016 |
| Mesh Office Seating (UK) Ltd. | Wholesale & retail | 2008 |
| Meshic Ltd | Information & communication | 2025 |
| Meshworks LLP | | 2016 |
| Message Mats Ltd. | Wholesale & retail | 2001 |
| Message Matters Limited | Professional & scientific | 2012 |
| Messina Management Ltd | Extraterritorial | 2011 |
| Messrs J & K Stewart LLP | | 2012 |
| Messrs J & T Mccolgan Funeral Directors Ltd | Other services | 2011 |
| Messy Desk Limited | Information & communication | 2023 |
| Messy Restaurants Ltd | Hospitality | 2025 |
| Messy Retail Ltd | Wholesale & retail | 2025 |
| Mesterton Projects LP | | 2013 |
| Meston Trade LP | | 2011 |
| MET Edinburgh Consulting Limited | Professional & scientific | 2021 |
| Meta Architecture Limited | Professional & scientific | 2016 |
| Metabio LP | | 2015 |
| Metacarpal Ltd | Professional & scientific | 2020 |
| Metaestate Ltd | Real estate | 2025 |
| Metafab Limited | Manufacturing | 1999 |
| Metafit Ltd. | Manufacturing | 2004 |