| MG Sugar Consultants Ltd | Professional & scientific | 2024 |
| Mianra Consulting Ltd | Professional & scientific | 2025 |
| MIG N WID Ltd | Manufacturing | 2020 |
| Mill of Kair Ltd | Mining & quarrying | 2004 |
| Mill Paving Ltd | Manufacturing | 2023 |
| Millend Garage Ltd. | Wholesale & retail | 2002 |
| Millfield Property Developments Limited | Construction | 2025 |
| Miltonkcc Ltd | Mining & quarrying | 2010 |
| Miss Moli's Limited | Other services | 2010 |
| Missing Ingredient Ltd | Hospitality | 2021 |
| Mission Fitness Scotland Ltd | Arts & recreation | 2018 |
| MJK Intervention Services Ltd | Professional & scientific | 2026 |
| MJM Montrose Limited | Manufacturing | 2021 |
| MKA Builders Ltd. | Construction | 2002 |
| MLM Property Services Limited | Hospitality | 2023 |
| MM Clark Consultancy Ltd | Professional & scientific | 2024 |
| Mmbirdie Consultants Ltd | Mining & quarrying | 2022 |
| MMR Marine Limited | Professional & scientific | 2016 |
| Modaco Ltd | Wholesale & retail | 2025 |
| Moeco Ltd | Water & waste | 2025 |
| Moella Limited | Professional & scientific | 2025 |
| Moir Driveways Limited | Construction | 2007 |
| Molindar Ltd | Manufacturing | 2021 |
| Montesa Limited | Wholesale & retail | 2026 |
| Montrave Estate Limited | Hospitality | 2016 |
| Montrose Autobody Ltd | Extraterritorial | 2025 |
| Montrose Carpet Discount Centre Ltd | Wholesale & retail | 2024 |
| Montrose Cleaning & Laundry Services Ltd | Other services | 2022 |
| Montrose Community Trust Limited | Education | 2011 |
| Montrose Football Club Limited | Arts & recreation | 1923 |
| Montrose Hardware Ltd | Wholesale & retail | 2018 |
| Montrose Home Appliance Company Limited | Wholesale & retail | 2000 |
| Montrose Live Music Company Ltd | Arts & recreation | 2024 |
| Montrose Nails and Spa Ltd | Other services | 2024 |
| Montrose Restaurant Ltd | Hospitality | 2025 |
| Montrose Rope & Sail Company Limited | Manufacturing | 2003 |
| Montrose Stores Ltd | Wholesale & retail | 2025 |
| Morwil Developments Ltd | Hospitality | 2024 |
| MQ Subsea Engineering Services Ltd | Mining & quarrying | 2016 |
| MRM Project Services Limited | Professional & scientific | 2008 |
| MRR Agri Services Ltd | Agriculture & fishing | 2024 |
| MRS Scotland (Holdings) Limited | Manufacturing | 2021 |
| MRS Scotland Limited | Manufacturing | 2013 |
| MS Engineering Solutions Ltd | Mining & quarrying | 2020 |
| MT Homes Ltd | Construction | 2011 |
| Muggd-Uk Ltd | Professional & scientific | 2025 |
| Muirside Homes Ltd | Real estate | 2023 |
| Murley Property Limited | Real estate | 2019 |
| Murray Taylor Audit Limited | Professional & scientific | 2023 |
| Murray, Taylor (Holdings) 2023 Limited | Financial services | 2023 |
| Murray, Taylor (Holdings) Limited | Professional & scientific | 2017 |
| Murrays Exterior Cleaning Ltd | Administrative & support | 2023 |
| Muscle Restoration and Wellness Limited | Health & social care | 2024 |
| MW Shellfish Limited | Agriculture & fishing | 2019 |
| MWE Wellservices Limited | Administrative & support | 2010 |
| MWH Oilfield Services Ltd | Administrative & support | 2026 |
| MWT (Scotland) Limited | Professional & scientific | 2026 |
| My Craft Morocco Ltd | Wholesale & retail | 2024 |
| N & S Will Holdings Ltd | Hospitality | 2017 |
| N. B. Investments Limited | Real estate | 2004 |
| National Contracts Limited | Professional & scientific | 2015 |
| NBR (Scotland) Limited | Professional & scientific | 2018 |
| ND Plumbing & Heating Services Ltd | Construction | 2018 |
| NE Marine and Offshore Services Ltd | Mining & quarrying | 2020 |
| Nemetona Ltd | Wholesale & retail | 2014 |
| New Lauriston Caravan Park Limited | Hospitality | 2000 |
| Nexgen Subsea Ltd | Professional & scientific | 2024 |
| Next to YOU (Montrose) Ltd | Wholesale & retail | 2003 |
| Next to YOU Lingerie Ltd | Wholesale & retail | 2026 |
| Nexus Leisure Ltd | Hospitality | 2023 |
| NF Cost Solutions Limited | Professional & scientific | 2012 |
| Nicoll Properties Limited | Real estate | 2014 |
| Nicoll Testing Services Scotland Limited | Professional & scientific | 2024 |
| Nicsnax Limited | Hospitality | 2024 |
| Night OWL Cleaners Ltd | Administrative & support | 2026 |
| Noel Bourke Engineering Limited | Professional & scientific | 2000 |
| Normuir Properties Ltd | Real estate | 2025 |
| Norrie Consultants Ltd | Mining & quarrying | 2019 |
| Norscot Roofing Ltd | Construction | 2024 |
| North Angus Care Ltd | Health & social care | 2019 |
| North East Wellbeing Solutions CIC | Education | 2018 |
| North Eastern Fuels Ltd | Agriculture & fishing | 2014 |
| North Star Roofing Systems Ltd | Construction | 2026 |
| Northeast Joinery Ltd | Construction | 2025 |
| Northesk Investments Limited | Hospitality | 2013 |
| NSB Autos Limited | Wholesale & retail | 2025 |
| NSN Takeaway Ltd | Hospitality | 2022 |
| Ocean Blue Swim School Limited | Education | 2025 |
| Oceans Health Ltd | Health & social care | 2012 |
| Odyssee Limited | Other services | 2004 |
| Offshore - Onshore Electrical Services Ltd | Manufacturing | 2025 |
| Offshore Installation Contractors Ltd | Mining & quarrying | 2016 |
| Oidid IOS Ltd | Manufacturing | 2018 |
| Oiltex Ltd | Mining & quarrying | 2005 |
| Oilwell Fishing & Remedial Services Ltd | Professional & scientific | 2024 |
| On-Scene Energy Ltd | Extraterritorial | 2024 |
| On-Scene Engineering Ltd | Wholesale & retail | 2022 |
| Open & Candid Ltd | Administrative & support | 2023 |
| ORBIT9 Ltd | Information & communication | 2019 |
| Ormesby Consultancy Ltd | Professional & scientific | 2020 |