| Midmark 18 Limited | Professional & scientific | 1989 |
| Midmark 2 Limited | Professional & scientific | 1988 |
| Midmark 9 Limited | Professional & scientific | 1988 |
| Midnight Inc. Ltd | Wholesale & retail | 2024 |
| Midnight Odyssey Productions Ltd | Information & communication | 2024 |
| Midnight Pulses Ltd | Wholesale & retail | 2025 |
| Midnight Tasty Munch Ltd | Hospitality | 2025 |
| Midocean Aggregator, L.P. | | 2023 |
| Midocean Energy (Scotland) GP, LLP | | 2022 |
| Midocean Energy Carry GP, L.P. | | 2025 |
| Midocean Energy Ii-A (Scotland) GP, LLP | | 2025 |
| Midocean Energy Ii-B (Scotland) GP, LLP | | 2026 |
| Midocean Holdings GP, LLP | | 2023 |
| Midocean Holdings II GP, LLP | | 2024 |
| Midocean LNG Australia GP, LLP | | 2023 |
| Midphy Ltd | Education | 2022 |
| Midun Silk Treats & Co Limited | Manufacturing | 2026 |
| Midway Investments L.P. | | 2011 |
| Midway Rampart LP | | 2011 |
| Midway Scottish Limited Partnership | | 2024 |
| Midwest Company L.P. | | 2015 |
| Midwest Corporation L.P. | | 2010 |
| Midwest Enterprises L.P. | | 2008 |
| Midwest Imports/Exports L.P. | | 2011 |
| Midwest Investments L.P. | | 2008 |
| Midwest Organisation L.P. | | 2008 |
| Midwest Services L.P. | | 2010 |
| Midwood SLP | | 1998 |
| Miena Jewellery Ltd | Wholesale & retail | 2014 |
| Miesetone Management LP | | 2015 |
| MIF I CIP (GP) Limited | Administrative & support | 2013 |
| MIF I CIP LP | | 2013 |
| MIF I Investors (GP) Limited | Administrative & support | 2013 |
| MIF I Investors LP | | 2013 |
| Mifa Labs Ltd | Information & communication | 2026 |
| MIG Solutions LP | | 2017 |
| Miggins Ltd | Information & communication | 2026 |
| Mighty Swimmers Ltd | Arts & recreation | 2011 |
| Mightyolu Ltd | Wholesale & retail | 2025 |
| Migill Software Ltd | Information & communication | 2014 |
| Migliore Ltd | Administrative & support | 2019 |
| Migralliq Data Mapping Ltd | Information & communication | 2026 |
| MIH Studio CIC | Arts & recreation | 2025 |
| Miha Ltd | Hospitality | 2020 |
| Miicard Limited | Information & communication | 2016 |
| Miicro Limited | Information & communication | 2006 |
| Miim Properties Limited | Real estate | 2021 |
| Miist Ltd | Professional & scientific | 2018 |
| MIK Trade Ltd | Wholesale & retail | 2025 |
| Mikado Transvaal LP | | 2011 |
| Mikalife Management Ltd | Extraterritorial | 2012 |
| Mikawildus Limited | Arts & recreation | 2012 |
| Mike Brent Associates Limited | Professional & scientific | 2014 |
| Mike Heavyweight Transport Ltd | Transport & logistics | 2016 |
| Mike Hutton Building and Joinery Ltd | Administrative & support | 2016 |
| Mike Mcinnes Limited | Hospitality | 2006 |
| Mike Paul VOX Limited | Information & communication | 2017 |
| Mikeglaire.Com Limited | Professional & scientific | 2003 |
| Mikoro Ltd | Information & communication | 2025 |
| Milagres Trade LP | | 2016 |
| Milagros LP | | 2001 |
| Milan (Senior Welfare Organisation) | Health & social care | 2002 |
| Milan Health Care Limited | Health & social care | 2023 |
| Milani Group LP | | 2016 |
| Milano Coffeehouse Ltd | Hospitality | 2025 |
| Milano Impex LP | | 2011 |
| Milatech Ltd | Construction | 2026 |
| Milaylo Limited | Professional & scientific | 2018 |
| Milburn Commerce LP | | 2013 |
| Milburn Lewis Ltd | Administrative & support | 2011 |
| Mildmich Trading LP | | 2016 |
| Mile Breaks Ltd | Hospitality | 2026 |
| Mile Motors Ltd | Administrative & support | 2026 |
| Milefold Export L.P. | | 2015 |
| Milen Cleaning Ltd | Administrative & support | 2025 |
| Milerhill Consult LP | | 2014 |
| Miles Coverdale Ltd | Extraterritorial | 2011 |
| Miles Jupp Limited | Arts & recreation | 2010 |
| Milestone Capital UK Carried Interest LP | | 2014 |
| Milestone Group | | 1994 |
| Milestone Scotland Limited | Financial services | 2018 |
| Milestone Telecom LP | | 2017 |
| Milestones Scotland Limited | Information & communication | 2020 |
| Milford Industries LP | | 2012 |
| Milford Logistics & Development LP | | 2016 |
| Milford Medija Alians LP | | 2015 |
| Milford Mission LP | | 2016 |
| Milford Sales L.P. | | 2012 |
| Milford Trading LP | | 2019 |
| Mili Velikova International Ltd | Other services | 2019 |
| Milk Catering Limited | Hospitality | 2018 |
| Milk Food Ltd | Hospitality | 2010 |
| Milk Property Ltd | Real estate | 2019 |
| Milky Games LP | | 2015 |
| Mill and Millard LLP | | 2016 |
| Mill Creek Capital LP | | 2013 |
| Mill Drove Health Ltd | Health & social care | 2024 |
| Mill Green Industries L.P. | | 2015 |
| Millar & Bryce Limited | Information & communication | 1991 |
| Millar Commercial LP | | 2012 |