| Metrol Technology (Brazil Operations) Limited | Professional & scientific | 2020 |
| Metrol Technology (Nominees) Limited | Other services | 2018 |
| Metrol Technology (Overseas) Limited | Other services | 2018 |
| Meval Services Limited | Information & communication | 2024 |
| MEX Care Limited | Other services | 2023 |
| Mezos Innovations Ltd | Wholesale & retail | 2024 |
| Mezzo Aberdeen Limited | Hospitality | 2026 |
| MFG Inverurie (1998) Limited | Mining & quarrying | 1978 |
| MFM Community Limited | Health & social care | 2013 |
| MFW Property Development Limited | Real estate | 2012 |
| MG Decor Services Ltd | Other services | 2018 |
| MG Risk Management Services Limited | Professional & scientific | 2018 |
| MG Surgical Limited | Information & communication | 2019 |
| MG Tubular Services Ltd | Professional & scientific | 2013 |
| MGB Drilling Ltd | Professional & scientific | 2021 |
| MGC Technical Service Ltd | Manufacturing | 2017 |
| MGD2 Limited | Financial services | 2022 |
| Mgjs Services Ltd | Administrative & support | 2022 |
| MGK Lifting Services Ltd | Professional & scientific | 2025 |
| MGM EOR Ltd | Professional & scientific | 2024 |
| MGM Hospitality Services Limited | Hospitality | 2022 |
| Mgmp Engineering Limited | Professional & scientific | 2010 |
| MGS Logistics Limited | Transport & logistics | 2002 |
| MH Consultancy Services Ltd | Professional & scientific | 2025 |
| MH Roofing (Aberdeen) Ltd | Construction | 2010 |
| Mh&Co. Inspection Ltd | Professional & scientific | 2025 |
| Mhbl (Holdings) Limited | Professional & scientific | 2011 |
| Mhfc Limited | Professional & scientific | 2018 |
| Mhss Limited | Wholesale & retail | 2025 |
| MI Removal & Logistics Ltd | Transport & logistics | 2024 |
| Mi-Mi Developments Limited | Professional & scientific | 2005 |
| Mibrich Limited | Real estate | 2025 |
| Michael Brown Electrical Limited | Construction | 2005 |
| Michael Crawford Tiling Limited | Construction | 2013 |
| Michael Crown Group Ltd | Wholesale & retail | 2026 |
| Michael Dodds Limited | Professional & scientific | 2022 |
| Michael Gall Transport Limited | Transport & logistics | 2003 |
| Michael Gilmour Associates Ltd | Professional & scientific | 2016 |
| Michael James Mcmahon Limited | Extraterritorial | 2025 |
| Michael Mcfadyen Property Leasing Ltd. | Real estate | 2003 |
| Michael Rennie (Callies) Farming 1987 | | 1987 |
| Michal Filipiuk Ltd | Mining & quarrying | 2023 |
| Michelle Cameron Limited | Professional & scientific | 2020 |
| Michiel Bosch Consultancy Services Ltd | Professional & scientific | 2022 |
| Michmic Ltd | Professional & scientific | 2024 |
| Micome Ltd | Professional & scientific | 2020 |
| Microfox Limited | Real estate | 2023 |
| Microfuse Technologies Ltd | Information & communication | 2024 |
| Microinterns Ltd. | Information & communication | 2024 |
| Micron Eagle Hydraulics Limited | Manufacturing | 1990 |
| Micropack (Engineering) Limited | Professional & scientific | 1996 |
| MID Investments Ltd | Hospitality | 2024 |
| Midas Agency Ltd | Wholesale & retail | 2023 |
| Midas Multimedia Limited | Information & communication | 1999 |
| Middleton Farms (Scotland) Ltd. | Agriculture & fishing | 2020 |
| Midland Purchase Limited | Hospitality | 2014 |
| Midmar Consultants Limited | Professional & scientific | 2018 |
| Midstocket Development Company Limited | Real estate | 2007 |
| Midstocket Limited | Wholesale & retail | 2015 |
| Midstocket OUT of School Club Limited | Education | 2024 |
| Midu Ventures Limited | Real estate | 2019 |
| Midus Aberdeen Ltd | Wholesale & retail | 2022 |
| MIG Consulting (Scotland) Ltd | Professional & scientific | 2016 |
| Migtek Limited | Wholesale & retail | 2023 |
| Miguelin Enterprises Ltd | Information & communication | 2025 |
| Mikadoes Limited | Professional & scientific | 2014 |
| Mike Duthie Ltd. | Transport & logistics | 2004 |
| Mike Plumbing and Heating Ltd | Construction | 2022 |
| Mike Runcie Paths & Driveways Limited | Construction | 2014 |
| Mike Stewart Plumbing & Heating Limited | Construction | 2018 |
| Mike Taylor Services Limited | Construction | 2005 |
| Mike's Famous Fast Foods Ltd. | Hospitality | 1996 |
| Mikona Ltd | Professional & scientific | 2016 |
| Mila Deen Ltd | Real estate | 2024 |
| Milaha Offshore Services (UK) Limited | Mining & quarrying | 2019 |
| Milarex UK Limited | Manufacturing | 2018 |
| Mile END Buildings Limited | Real estate | 2024 |
| Mile END Medical Ltd | Professional & scientific | 2025 |
| Mile Events Training Solutions Limited | Other services | 2023 |
| Milebox Ltd | Information & communication | 2020 |
| Mileyswim Limited | Administrative & support | 2012 |
| Millden Property Company Limited | Real estate | 2004 |
| Millenium Nederlandse Antillen LP | | 2014 |
| Miller & Co. Investment Management Limited | Financial services | 1993 |
| Miller Design and Contracting Ltd | Professional & scientific | 2025 |
| Miller Farms Limited | Agriculture & fishing | 2021 |
| Miller Mcwilliam Limited | Professional & scientific | 2002 |
| Miller Plant Holdings Limited | Financial services | 2021 |
| Miller Plant Limited | Construction | 2000 |
| Millers Motorhome Hire Ltd | Administrative & support | 2025 |
| Millgaet Media Ltd | Administrative & support | 2007 |
| Millpond Skye Ltd | Real estate | 2022 |
| Mills + Mccullough Ltd | Professional & scientific | 2021 |
| MILLS200 Limited | Other services | 2019 |
| Millum Investments Limited | Real estate | 2013 |
| Milmor Properties Limited | Real estate | 1973 |
| Milncroft Catering Ltd | Hospitality | 2023 |
| Milne Environmental Ltd. | Administrative & support | 2010 |
| Milne Financial Planning Ltd | Financial services | 2024 |
| Milneden (Holdings) Limited | Other services | 2009 |