| M K Maclennan Limited | Public administration | 2024 |
| M Lipphardt Contracting Limited | Construction | 2016 |
| M Mckenzie Old Pentland LLP | | 2006 |
| M Noodle Bar Ltd | Hospitality | 2023 |
| M Plus Livingston Limited | Manufacturing | 2026 |
| M Prior Consulting Limited | Transport & logistics | 2016 |
| M R & S Properties Limited | Real estate | 2002 |
| M Smallman Management Ltd | Extraterritorial | 2012 |
| M Squared Life Limited | Manufacturing | 2015 |
| M Stirling Consultancy Limited | Professional & scientific | 2024 |
| M W Dundas Ltd | Professional & scientific | 2020 |
| M&A Mergers and Acquisitions Consultancy LP | | 2016 |
| M&C W Lettings Ltd. | Other services | 2022 |
| M&C W Properties Ltd. | Other services | 2020 |
| M&Co Trading Limited | Wholesale & retail | 2020 |
| M&D Supply Solutions Limited | Wholesale & retail | 2018 |
| M&G Alternatives GP LLP | | 2024 |
| M&G Black Seed GP LLP | | 2023 |
| M&G Black Seed LP | | 2023 |
| M&G Catalyst Sustainable Agriculture GP LLP | | 2022 |
| M&G Catalyst Sustainable Agriculture GP Member NO 1 Limited | Administrative & support | 2022 |
| M&G Catalyst Sustainable Agriculture GP Member NO 2 Limited | Administrative & support | 2022 |
| M&G Catalyst Sustainable Agriculture LP | | 2023 |
| M&G Ddpf (CIP) LP | | 2025 |
| M&G Group Investments Limited | Professional & scientific | 2020 |
| M&G MFH Carry General Partner Limited | Administrative & support | 2025 |
| M&G MFH Carry Limited Partnership | | 2025 |
| M&G MFH Feeder General Partner Limited | Administrative & support | 2025 |
| M&G MFH Feeder Limited Partnership | | 2025 |
| M&G PFI 2018 GP LLP | | 2017 |
| M&G PFI Carry Partnership 2016 LP | | 2016 |
| M&G PFI Partnership 2016 LP | | 2016 |
| M&G PFI Partnership 2018 LP | | 2017 |
| M&G Real Estate UK Enhanced Value LP | | 2017 |
| M&G Red Employee Feeder LP | | 2009 |
| M&G Red II Employee Feeder LP | | 2012 |
| M&G Red II SLP LP | | 2012 |
| M&G Red III Employee Feeder LP | | 2012 |
| M&G Red III SLP LP | | 2012 |
| M&G Red SLP LP | | 2009 |
| M&G SFF 3 (CIP GP) LLP | | 2020 |
| M&G SFF 3 (CIP) LP | | 2020 |
| M&G Ukev (SLP) LP | | 2017 |
| M&J International Creations LP | | 2025 |
| M&K Bona Real Estate LP | | 2017 |
| M&K0M Ltd | Information & communication | 2025 |
| M&M Brothers (Scot) Ltd | Wholesale & retail | 2024 |
| M&M Pictures Ltd | Information & communication | 2025 |
| M&M Research Limited | Professional & scientific | 2018 |
| M&Me Co. LP | | 2025 |
| M&Mt Consulting Ltd | Professional & scientific | 2024 |
| M&N Plumbing & Heating Ltd | Construction | 2017 |
| M&O Hospitality Group Limited | Hospitality | 2022 |
| M&P Duffy City Developments Limited | Real estate | 2026 |
| M&S Convenience Limited | Wholesale & retail | 2024 |
| M&S Plus Ltd | Wholesale & retail | 2025 |
| M&T Estate Management Ltd | Real estate | 2024 |
| M&T for Business and Consulting Limited | Wholesale & retail | 2020 |
| M&T Techno UK Ltd | Information & communication | 2025 |
| M&U Vehicles Ltd | Administrative & support | 2023 |
| M&V HON Limited | Real estate | 2017 |
| M&V Management Services LP | | 2011 |
| M+ 2 Founder LP | | 2025 |
| M-Push LP | | 2013 |
| M-Star-M Ltd | Information & communication | 2025 |
| M-Tek Management Services Ltd | Professional & scientific | 2022 |
| M. Krark Ltd | Wholesale & retail | 2025 |
| M. Macvicar Consulting QS Ltd | Professional & scientific | 2025 |
| M.A Express Solutions LP | | 2017 |
| M.A.F. Group LP | | 2015 |
| M.A.P. Business Solutions Limited | Professional & scientific | 2019 |
| M.B. Taxis 752 Ltd. | Transport & logistics | 2012 |
| M.B. Taxis Ltd. | Transport & logistics | 2001 |
| M.C. Anaesthesia Limited | Health & social care | 2019 |
| M.E.B Direct Ltd | Wholesale & retail | 2015 |
| M.H Urban Core Ltd | Wholesale & retail | 2025 |
| M.H. Innes Ltd | Professional & scientific | 2025 |
| M.J Scaffolding Services Ltd | Extraterritorial | 2022 |
| M.K.M. Dumfries ST Marys Limited | Wholesale & retail | 2018 |
| M.L.A. Joinery Ltd. | Construction | 2019 |
| M.O.B. LP | | 2020 |
| M.O.G Group Limited | Construction | 2025 |
| M.S. for ICT and Itsecurity LP | | 2023 |
| M.S. Uniprogramming LP | | 2019 |
| M.T. Restaurants Limited | Hospitality | 2016 |
| M1 Barber Shop Ltd | Other services | 2025 |
| M1 RE Edinburgh Limited | Hospitality | 2011 |
| M2 Barber Ltd | Other services | 2025 |
| M2 Films Ltd | Information & communication | 2012 |
| M2 Landscapes Ltd | Administrative & support | 2025 |
| M2 Management Solutions Ltd | Professional & scientific | 2024 |
| M2 Services Ltd | Information & communication | 2023 |
| M2S Holdings Limited | Real estate | 2018 |
| M3 Energy Scotland Ltd | Other services | 2016 |
| M77 Singh Limited | Wholesale & retail | 2025 |
| M8 Industries Ltd | Manufacturing | 2025 |
| M8 Property Ltd | Construction | 2022 |
| M8HOMES (Scotland) Ltd | Real estate | 2019 |
| M8TE Ltd | Real estate | 2021 |
| M@R Ltd. | Real estate | 1982 |