| Lothian Logistics Ltd | Transport & logistics | 2024 |
| Lothian Pure Bees Ltd | Agriculture & fishing | 2020 |
| Lothian Racking Limited | Construction | 2018 |
| Lothian Tech Services Limited | Information & communication | 2018 |
| Lothian Vehicle Bodybuilders Limited | Manufacturing | 1993 |
| Louise Bain Aesthetics Academy Ltd | Other services | 2019 |
| Love Outdoor Learning Ltd | Education | 2018 |
| Love YOU Aesthetics Clinic Ltd | Other services | 2023 |
| LRM Lorry Loaders & Plant Maintenance Ltd | Wholesale & retail | 2025 |
| Lrrn Limited | Information & communication | 2021 |
| LS Utilities Ltd | Construction | 2020 |
| LSR Property Limited | Real estate | 2023 |
| LTG Mathers Limited | Wholesale & retail | 2024 |
| LTG Pubs Limited | Hospitality | 2020 |
| Lucerne Properties Ltd | Real estate | 2021 |
| Ludotek Limited | Professional & scientific | 2020 |
| Lulu's Armadale Ltd | Other services | 2020 |
| Luna Nails 2026 Ltd | Other services | 2026 |
| LX Golden WOK Limited | Hospitality | 2026 |
| Lynne Rldn Ltd | Health & social care | 2023 |
| M & G @ the Bridge Ltd | Hospitality | 2023 |
| M David & SON Ltd | Education | 2025 |
| M Philips Joinery Limited | Construction | 2015 |
| M Philips Properties Ltd | Real estate | 2025 |
| M&G Thomson Property Limited | Households | 2022 |
| M&K Developments (Scotland) Ltd | Construction | 2024 |
| M&S Auto Solutions Ltd | Wholesale & retail | 2009 |
| M3 Roofing & Cladding Ltd | Construction | 2021 |
| MA Grill House Ltd | Manufacturing | 2026 |
| MAC Flow Scotland Ltd | Wholesale & retail | 2026 |
| MAC Grocers Ltd | Hospitality | 2018 |
| Macattack IT Ltd | Other services | 2023 |
| Maccorns Limited | Manufacturing | 2001 |
| Macdonald Aviemore Highland Resort Limited | Hospitality | 2009 |
| Macdonald Burlington Limited | Hospitality | 2017 |
| Macdonald Forest Hills (Aberfoyle) Limited | Hospitality | 2006 |
| Macdonald Golf Limited | Arts & recreation | 2006 |
| Macdonald Hotels (Management) Limited | Hospitality | 1992 |
| Macdonald Hotels (Solberge) Limited | Hospitality | 2013 |
| Macdonald Hotels and Resorts Limited | Hospitality | 1992 |
| Macdonald Hotels Aviemore Development Limited | Hospitality | 2009 |
| Macdonald Hotels Developments Limited | Hospitality | 2014 |
| Macdonald Hotels Equity Trustee Company Limited | Administrative & support | 2003 |
| Macdonald Hotels Investments Limited | Hospitality | 1990 |
| Macdonald Hotels Limited | Hospitality | 2003 |
| Macdonald Hotels Management Services Limited | Hospitality | 2009 |
| Macdonald Hotels Mtip Trustee Company Limited | Administrative & support | 2003 |
| Macdonald Hotels Trustees Limited | Professional & scientific | 1993 |
| Macdonald Lochanhully Limited | Hospitality | 2017 |
| Macdonald Plas Talgarth Limited | Hospitality | 2017 |
| Macdonald Portland Limited | Hospitality | 2010 |
| Macdonald Resort Ownership Limited | Administrative & support | 2010 |
| Macdonald Resorts (LA Ermita) Limited | Administrative & support | 1998 |
| Macdonald Resorts (Vale D'Oliveiras) Limited | Hospitality | 2012 |
| Macdonald Resorts Limited | Hospitality | 1937 |
| Macdonald Whiteside Limited | Hospitality | 2017 |
| Macdonald Windsor Limited | Hospitality | 2017 |
| Macfarlane Structural Design Limited | Professional & scientific | 2020 |
| Machynia Group Ltd | Construction | 2026 |
| Machynia Ltd | Construction | 2018 |
| Machynia Telecom Services Ltd | Construction | 2021 |
| Maciz Lounge Ltd | Other services | 2018 |
| Mack Motorsport Ltd | Manufacturing | 2020 |
| Macrae QA Limited | Information & communication | 2014 |
| Madkeen Campers Ltd | Administrative & support | 2025 |
| Magdalena Florczak - Elite Aesthetics Ltd | Other services | 2021 |
| Mainstead Limited | Information & communication | 2006 |
| Majid Spice Ltd | Hospitality | 2025 |
| Majka Polish Store Ltd | Wholesale & retail | 2022 |
| Malik Petroleum Ltd | Wholesale & retail | 2014 |
| Malik Retailer Ltd | Wholesale & retail | 2025 |
| Malomi Ltd | Hospitality | 2024 |
| Mama Fiffy Limited | Health & social care | 2023 |
| Manabelle Ltd | Real estate | 2021 |
| Manor (2012) Ltd | Real estate | 2021 |
| Manor Gundogs Limited | Agriculture & fishing | 2020 |
| Manor Interiors (Scotland) Limited Partnership | | 2003 |
| Manor Oak Construction Ltd | Construction | 2026 |
| Manorport Limited | Health & social care | 2009 |
| Maratec Ltd | Professional & scientific | 2018 |
| Marcoons Consulting Limited | Administrative & support | 2014 |
| Marlex Services Ltd | Other services | 2021 |
| Marpan Ltd | Transport & logistics | 2015 |
| Marr Courier Services Ltd | Transport & logistics | 2022 |
| Marrocco Investment Ltd | Wholesale & retail | 2024 |
| Mary Mckale Ltd | Hospitality | 2018 |
| MAS (Scotland) Ltd | Financial services | 2005 |
| Master Movers ( Scotland) Ltd | Transport & logistics | 2022 |
| Master Patterns Limited | Manufacturing | 1985 |
| Master's Spice Ltd | Hospitality | 2019 |
| Mauchline Science Consultants Limited | Professional & scientific | 2011 |
| Maven Technical Consulting Ltd | Professional & scientific | 2014 |
| Maxam Developments Ltd | Real estate | 2015 |
| Maxout Holdings Ltd | Financial services | 2024 |
| Maxout Media Ltd | Information & communication | 2021 |
| Maybrook Financial Ltd | Administrative & support | 2025 |
| Mayday A.A.M. Ltd. | Transport & logistics | 2013 |
| Mayrock Ltd | Real estate | 2021 |
| Ma’Ami’S Kitchen Limited | Hospitality | 2024 |
| MB Access Ltd | Construction | 2020 |