| Muscida LP | | 2012 |
| Muscle Revolution Limited | Arts & recreation | 2024 |
| Muse Hair Ltd | Other services | 2002 |
| Musemantik Limited | Information & communication | 2009 |
| Museum Context Edinburgh Limited | Wholesale & retail | 2024 |
| Museum Context Limited | Wholesale & retail | 2012 |
| Museum of Magic, Fortune-Telling & Witchcraft Ltd | Arts & recreation | 2023 |
| Museum of the Royal Regiment of Scotland | Arts & recreation | 2013 |
| Museums Galleries Scotland | Arts & recreation | 1981 |
| Museumsetc Limited | Information & communication | 2008 |
| Musi-Clinic Ltd | Information & communication | 2018 |
| Music & Lyrics (Addams) Limited | Arts & recreation | 2016 |
| Music & Lyrics Ltd | Arts & recreation | 2011 |
| Music Base Limited | Information & communication | 2014 |
| Music Files Ltd | Information & communication | 2009 |
| Music for Scotland Limited | Other services | 2011 |
| Music Isn'T Real Ltd | Information & communication | 2024 |
| Music Tourist CIC | Administrative & support | 2016 |
| Musical Holdings LP | | 2016 |
| Musical Theatre Fitness Ltd | Information & communication | 2020 |
| Muslim-Fs Ltd | Other services | 2021 |
| Musme LP | | 2001 |
| Must Invest LP | | 2016 |
| Musta Mets Ltd | Manufacturing | 2022 |
| Mustafa and Mustafa Medical Services Limited | Health & social care | 2025 |
| Mustafas Dera Limited | Hospitality | 2022 |
| Musto International Limited | Administrative & support | 2007 |
| Mustonshire Invest LP | | 2013 |
| Mutafuq Educational Service Ltd | Wholesale & retail | 2022 |
| Mutch Strategic Associates Limited | Professional & scientific | 2014 |
| Mutual Partnership L.P. | | 2010 |
| Mutuware Limited | Information & communication | 2014 |
| MUX International Ltd | Wholesale & retail | 2023 |
| Muzzle's Hair Limited | Other services | 2024 |
| Muzzlehoff Limited | Real estate | 2022 |
| MV Actuarial Solutions Limited | Professional & scientific | 2021 |
| MVA Business Group LP | | 2017 |
| MVE Service LP | | 2024 |
| MVF Ltd | Administrative & support | 2025 |
| Mvii Founder LP | | 2023 |
| MVM General Partner (NO.3) Scottish Limited Partnership | | 2008 |
| MVM GP (NO.4) LLP | | 2014 |
| MVM GP (NO.4) Scottish LP | | 2014 |
| MVM GP (NO.5) LP | | 2018 |
| MVM GP (NO.6) LP | | 2022 |
| MVM GP (WH I) LLP | | 2026 |
| MVM GP (WH I) LP | | 2026 |
| MVM Life Science GP (NO.3) LLP | | 2015 |
| MVM Project Ltd | Extraterritorial | 2017 |
| Mvmt Sports Ltd | Education | 2021 |
| MVR Homecare Ltd | Construction | 2026 |
| MVR Rivermount Construction Ltd | Construction | 2025 |
| Mvrck Limited | Hospitality | 2025 |
| MW & MR Taxis Ltd | Extraterritorial | 2022 |
| MW Guiding Limited | Administrative & support | 2021 |
| MW Project Solutions Limited | Hospitality | 2010 |
| MW Visuals Ltd | Professional & scientific | 2019 |
| Mwambao Store Ltd | Transport & logistics | 2025 |
| MWB Malmaison Brand Limited | Administrative & support | 1996 |
| Mwcp Holdings Limited | Other services | 2025 |
| MWD Design Ltd | Professional & scientific | 2026 |
| MWE Property Ltd | Real estate | 2024 |
| Mweb Five Limited | Administrative & support | 2014 |
| MWG Consulting Ltd | Professional & scientific | 2019 |
| MWM Roofing Ltd | Construction | 2025 |
| Mwps Letting Ltd | Real estate | 2022 |
| Mwra Consulting Ltd | Professional & scientific | 2023 |
| MXK Solutions Ltd | Information & communication | 2015 |
| Mxstudio Network Holding LP | | 2018 |
| MXT Solution LP | | 2017 |
| My Advanced Bespoke Care Ltd | Health & social care | 2022 |
| My Apartments Lettings Ltd | Real estate | 2016 |
| My Bizness Software Ltd | Information & communication | 2023 |
| My Company Media Limited | Information & communication | 2025 |
| My Customer Lens Limited | Information & communication | 2017 |
| My Edinburgh Life Limited | Hospitality | 2014 |
| My Electrical Solutions (Scot) Ltd | Construction | 2024 |
| My Eyes Clothing Ltd | Wholesale & retail | 2024 |
| My Finance Department Ltd | Professional & scientific | 2025 |
| My Health & Wellbeing Limited | Health & social care | 2013 |
| My Hollywood Diner Limited | Hospitality | 2025 |
| My Home Grampian Property Services Limited | Information & communication | 2012 |
| My Home Town Limited | Hospitality | 2024 |
| My Hope Property Limited | Financial services | 2023 |
| My Kind of Book CIC | Education | 2020 |
| My Last Adventure Ltd | Real estate | 2026 |
| My Little Secret Ltd | Wholesale & retail | 2023 |
| My Little Wool Company Limited | Agriculture & fishing | 2025 |
| My NAME’5 Doddie Trading Limited | Wholesale & retail | 2025 |
| My Neighbourhood Services Ltd. | Professional & scientific | 2024 |
| My Picture Book Ltd | Wholesale & retail | 2025 |
| My Project Business Ltd | Professional & scientific | 2024 |
| My Project Services Ltd | Administrative & support | 2022 |
| My Repurposed Wardrobe Ltd | Wholesale & retail | 2023 |
| My Scottish Apartment Ltd | Households | 2024 |
| My Snag Scotland Ltd | Other services | 2024 |
| My Solutions LP | | 2025 |
| My Surgery Website Ltd | Information & communication | 2026 |
| My Waves Technologies Ltd | Professional & scientific | 2024 |
| My Window (UK) Ltd | Professional & scientific | 2024 |