| Mcateer Services & Co | | 2001 |
| Mcauley Enterprises Ltd | Financial services | 2024 |
| Mcauley Property Ltd | Real estate | 2023 |
| Mcavoy and Muir Ltd | Real estate | 2025 |
| Mcbeath Residential Limited | Real estate | 2022 |
| MCC Process Technology Limited | Manufacturing | 2016 |
| Mcca Limited | Information & communication | 2020 |
| Mccabe & Mccabe Ltd | Professional & scientific | 2018 |
| Mccaigs Group Ltd | Information & communication | 2015 |
| Mccallum Contracts Ltd | Construction | 2025 |
| Mccallum OIL & GAS Consulting Ltd. | Real estate | 2001 |
| Mccalman Mcleod Limited | Other services | 2017 |
| Mccance Properties Ltd | Real estate | 2026 |
| Mccann Estates Ltd. | Administrative & support | 2009 |
| Mccann Media (Edinburgh) Limited | Information & communication | 2019 |
| Mccaul Consulting Limited | Professional & scientific | 2017 |
| Mccaw Joinery Ltd | Construction | 2025 |
| Mccf Consultancy Limited | Information & communication | 2022 |
| Mccf Trustees Limited | Financial services | 2012 |
| Mcchans Ltd | Hospitality | 2024 |
| Mcclair Brady & Co | | 1991 |
| Mcclure Plumbing & Heating Ltd | Construction | 2022 |
| Mccoll Associates (Consulting Engineers) Limited | Professional & scientific | 2008 |
| Mccoll Structures Ltd | Professional & scientific | 2017 |
| Mccormack Partners Limited | Administrative & support | 2016 |
| Mccormick (UK) Limited | Manufacturing | 1928 |
| Mccourt Photography Ltd | Professional & scientific | 2024 |
| Mccoy Group LP | | 2018 |
| Mccoy Holdings LP | | 2018 |
| Mccrae & Mccrae Limited | Real estate | 2006 |
| Mccrann Engineering Ltd | Construction | 2025 |
| Mccreadie Design Limited | Professional & scientific | 2013 |
| Mccreath & Co Limited | Professional & scientific | 2018 |
| Mccreath Secretarial Limited | Extraterritorial | 2008 |
| Mccurrach Financial Services Limited | Other services | 2008 |
| Mccurrach Investments Limited | Professional & scientific | 2001 |
| Mccurrach U.K. Brokers Limited | Wholesale & retail | 1993 |
| Mccurrach UK Ltd. | Administrative & support | 1963 |
| MCD Leisure Limited | Hospitality | 2020 |
| MCD Partners Limited | Professional & scientific | 2016 |
| Mcda Edinburgh Ltd | Financial services | 2018 |
| Mcdaid Public Relations Limited | Professional & scientific | 2016 |
| Mcdare Family Ltd | Real estate | 2025 |
| Mcdonald Davies Construction Limited | Construction | 2014 |
| Mcdonald Gordon & Co Ltd | Professional & scientific | 1994 |
| Mcdonald Johnston Heritable Limited | Real estate | 2017 |
| Mcdonald Property Ltd | Real estate | 2026 |
| Mcdougall Mcqueen Trustees Limited | Extraterritorial | 2006 |
| Mcdowall Bird Properties Ltd | Real estate | 2026 |
| Mcdowall Consulting Limited | Professional & scientific | 2011 |
| Mcdowell & Co. (Scotland) Ltd. | Real estate | 1993 |
| Mcduran Limited | Real estate | 2016 |
| MCE Performance Evaluation Consultants Limited | Professional & scientific | 2013 |
| MCE Serviceline Limited | Other services | 2018 |
| Mcell Consulting Limited | Information & communication | 2015 |
| Mcewan Decorating Services Limited | Construction | 2016 |
| Mcewan Fraser (UK) Limited | Real estate | 2003 |
| Mcewan Fraser Capital Limited | Real estate | 2023 |
| Mcewan Fraser Holdings LLP | | 2023 |
| Mcewan Fraser Legal (Scotland) LLP | | 2012 |
| Mcewan Fraser Legal (Trustees) Limited | Extraterritorial | 2014 |
| Mcewan Fraser Legal Limited | Extraterritorial | 2011 |
| Mcewan Fraser Legal Services LLP | | 2012 |
| Mcewan Fraser LLP | | 2008 |
| Mcewan Fraser Services Limited | Real estate | 1999 |
| Mcewan Kremer Ltd | Real estate | 2019 |
| Mcewan Marketing Group Ltd | Professional & scientific | 2024 |
| Mcewan Properties Limited | Real estate | 2003 |
| Mcfadyen Property Ltd | Real estate | 2024 |
| Mcfall Recruitment Limited | Administrative & support | 2018 |
| Mcfarlane Investments Ltd | Other services | 2017 |
| Mcfarlane Joiners and Builders (Fife) Limited | Construction | 2020 |
| Mcfarlane Lettings Ltd | Real estate | 2026 |
| Mcfarlane Productions Limited | Extraterritorial | 2005 |
| Mcfarlane Trading Ltd | Professional & scientific | 2018 |
| MCG Merchant Services Ltd | Administrative & support | 2023 |
| MCG Public House Limited | Hospitality | 2024 |
| Mcgarry Care Services Limited | Health & social care | 2022 |
| Mcgeady Holdings Limited | Construction | 2020 |
| Mcgeady Property & Land Limited | Real estate | 2022 |
| Mcgeady SCO Limited | Financial services | 2026 |
| Mcgee Rentals Limited | Real estate | 2024 |
| Mcgeorge Appointments Limited | Administrative & support | 2021 |
| Mcgeorge International Associates | | 1990 |
| Mcgillivray Funeral Directors Limited | Other services | 2016 |
| Mcginley Taxis Ltd. | Other services | 1999 |
| Mcgoff Financial Services Limited | Professional & scientific | 2008 |
| Mcgrath International & Co | | 1991 |
| Mcgrath Students Limited | Hospitality | 2022 |
| Mcgregor & Co. (Leith) Limited | Real estate | 1956 |
| Mcgregor & Mcgregor NO8 Limited | Extraterritorial | 2018 |
| Mcgregor Access Ltd | Construction | 2024 |
| Mcgregor Bond Limited | Administrative & support | 2012 |
| Mcgregor Bowes Limited | Administrative & support | 2014 |
| Mcgregor Electrical Ltd | Construction | 2016 |
| Mcgregor's BRO LP | | 2017 |
| Mcgregor's Taxis NO. 8 | | 1998 |
| Mcgregor's Taxis NO. 9 | | 1998 |
| Mcgregors (Huntly) Limited | Information & communication | 2022 |
| Mcgregors Taxis NO. 7 | | 1998 |