| Live Active Leisure Limited | Arts & recreation | 1965 |
| Live Active Leisure Trading Limited | Hospitality | 2012 |
| Livingston Power Consulting Ltd | Professional & scientific | 2024 |
| Liza K Hair and Beauty Ltd | Other services | 2022 |
| LJH Electrical Contractor Ltd | Construction | 2020 |
| LNK Mortgages Ltd | Financial services | 2024 |
| LOB Groundworks and Landscaping Ltd | Construction | 2023 |
| Local Legends Plumbing Ltd | Construction | 2026 |
| Locally Away Ltd | Hospitality | 2024 |
| Loch & Lather Ltd | Wholesale & retail | 2025 |
| Loch Morar Association | Administrative & support | 1996 |
| Loch Ness Guest House Limited | Hospitality | 2013 |
| Loch Ness Stores Limited | Hospitality | 2014 |
| Lochaber Hydro Ltd | Energy | 2015 |
| Lochlane Nominees Limited | Administrative & support | 2001 |
| Lochran Limited | Information & communication | 2019 |
| Lochty Tyres Limited | Wholesale & retail | 2017 |
| Logic AI Agents Ltd | Information & communication | 2025 |
| Logie Properties Perth Limited | Households | 2025 |
| Logiealmond Water Ltd | Water & waste | 2021 |
| Lohmann Breeders UK Limited | Agriculture & fishing | 2016 |
| Lomond Hills Ltd | Hospitality | 2023 |
| London Laundries Limited | Administrative & support | 2025 |
| Longmuir Property Ltd | Households | 2025 |
| Lorna Davies Florist Limited | Other services | 2015 |
| Lornty Farms Ltd | Wholesale & retail | 2025 |
| Lothian Concrete Limited | Manufacturing | 2016 |
| Lothian Grab Hire Limited | Administrative & support | 2016 |
| Lothian Kongcrete Limited | Manufacturing | 2016 |
| Loudon Plumbing & Heating Ltd | Construction | 2026 |
| Louis T'Ney Hair & Beauty Limited | Hospitality | 2005 |
| Louise Fairlie Hair Limited | Other services | 2019 |
| Lower Letham Limited | Agriculture & fishing | 2006 |
| Lower Scone Fishings | | 1991 |
| Loweryourscores.Com Limited | Arts & recreation | 2012 |
| LPF Lettings Ltd | Real estate | 2026 |
| Lqhidden Gems Ltd | Wholesale & retail | 2025 |
| LTW Education Limited | Education | 2025 |
| Lucent Intelligence Limited | Professional & scientific | 2026 |
| Luing Cattle Society Limited (the) | Other services | 1966 |
| Lulu Swift Ltd | Wholesale & retail | 2025 |
| Luna Pizza Company Ltd | Hospitality | 2025 |
| LUNA88 Limited | Health & social care | 2025 |
| Lunavera Collective Limited | Wholesale & retail | 2026 |
| Luncarty Travel Limited | Administrative & support | 2019 |
| Luvinurstyle Ltd | Wholesale & retail | 2014 |
| LUX Executive Travel Limited | Transport & logistics | 2022 |
| LUX Nails Perth Ltd | Other services | 2026 |
| LUX Premier Holidays Ltd | Hospitality | 2025 |
| Luxelightuk Ltd | Wholesale & retail | 2024 |
| Luxury Hideaways Ltd. | Hospitality | 2019 |
| Luxury Lets Scotland Ltd | Real estate | 2021 |
| LVR Business to Business Limited | Information & communication | 2009 |
| Lynton Construction Ltd | Extraterritorial | 2014 |
| M & L Harvey Ltd | Information & communication | 2025 |
| M Logistic Perth Ltd | Wholesale & retail | 2025 |
| M Thomas Electrical Ltd | Construction | 2023 |
| M&A Foods (Perth) Limited | Hospitality | 2024 |
| M&M Building Contractors Ltd | Construction | 2009 |
| M&R Detail Studio Ltd | Administrative & support | 2025 |
| M&Z Bistro Ltd | Hospitality | 2023 |
| M-Plumb Limited | Construction | 2025 |
| M.A.M. Civil Contracting Limited | Construction | 2016 |
| M.A.M. Contracting Limited | Construction | 2004 |
| M2 Property Development (Scotland) Ltd | Construction | 2021 |
| M3 Networks Limited | Administrative & support | 2009 |
| M3S Surveys Limited | Administrative & support | 2019 |
| MAC & Black Ltd. | Other services | 2013 |
| Macaber Ltd | Wholesale & retail | 2020 |
| Macantar Engineering Limited | Manufacturing | 1987 |
| Macaulay Wealth Management Ltd | Professional & scientific | 2020 |
| Macdal Electrical Services Ltd | Construction | 2022 |
| Mackay Contracts Ltd | Agriculture & fishing | 2022 |
| Mackay Decorators (Perth) Limited | Construction | 1991 |
| Maclellans (Think on) Limited | Hospitality | 2012 |
| Macleod Estates Ltd | Hospitality | 2020 |
| Macmillan Douglas Limited | Administrative & support | 2017 |
| Macnabs LLP | | 2005 |
| Macnaughton Group Limited | Extraterritorial | 1957 |
| Macnaughton Holdings Limited | Manufacturing | 1986 |
| Macphail Property Services Ltd | Real estate | 2016 |
| Macpherson Assurance Consultancy Ltd. | Administrative & support | 2008 |
| Macritchie Medicare Ltd | Health & social care | 2012 |
| Macrotrition Ltd | Hospitality | 2024 |
| Macshah Group Ltd | Hospitality | 2025 |
| Madd Stoves Ltd | Wholesale & retail | 2017 |
| Made by Beam Ltd | Manufacturing | 2025 |
| Madra Pet Styles Limited | Other services | 2021 |
| Maggie Roderick Ltd | Professional & scientific | 2022 |
| Magnum Building Contracts Ltd | Construction | 2025 |
| Maiden Estates Ltd | Agriculture & fishing | 2023 |
| Mail Bloom Ltd | Professional & scientific | 2025 |
| Main (Design & Build) Ltd. | Construction | 2008 |
| MAK Commercial Support Limited | Administrative & support | 2026 |
| MAK Timber Frame Systems Ltd | Construction | 2022 |
| MAK11 Retail Limited | Other services | 2020 |
| MAK3 Group Ltd | Wholesale & retail | 2024 |
| Makorange Limited | Extraterritorial | 2011 |
| Maksons Brit Energy Ltd | Other services | 2025 |
| Maksons One Ltd | Real estate | 2016 |