| Kcpa Services Ltd | Administrative & support | 2019 |
| KDB Consultancy Services Ltd | Professional & scientific | 2017 |
| KDB Joinery (Montrose) Limited | Construction | 2026 |
| Keiken Properties Ltd | Real estate | 2023 |
| Keldecor Ltd | Construction | 2015 |
| Kemlo Joinery Services Ltd | Other services | 2014 |
| Keptie Bakery Limited | Manufacturing | 2005 |
| Kerry Smith Architects Ltd. | Administrative & support | 2011 |
| Kevin Dunbar Ltd | Professional & scientific | 2016 |
| Kevin Slesser Plumbing & Heating Limited | Professional & scientific | 2012 |
| Kilted Competitions Limited | Arts & recreation | 2021 |
| Kilties Campers Limited | Administrative & support | 2025 |
| KIN Robotics Ltd | Professional & scientific | 2024 |
| Kingdom Roofing Ltd. | Construction | 2025 |
| Kinneff Farms Limited | Wholesale & retail | 2011 |
| Kinneff Old Church Preservation Trust Limited (the) | Arts & recreation | 1979 |
| KJR Well Services Limited | Mining & quarrying | 2016 |
| KLT Consultancy Services Ltd | Professional & scientific | 2025 |
| KMA Contractors Ltd | Mining & quarrying | 2015 |
| Kmcsv Ltd | Professional & scientific | 2026 |
| Know ME, I AM Global Limited | Professional & scientific | 2024 |
| KOP Estates Limited | Real estate | 2025 |
| KR Tubular Inspection Services Ltd | Mining & quarrying | 2022 |
| Kratos Investments (UK) Limited | Real estate | 2016 |
| KRC International Limited | Transport & logistics | 2006 |
| Kylan Energy Ltd | Energy | 2024 |
| L & G Fish Limited | Administrative & support | 2022 |
| L & L Well Services Ltd | Real estate | 2011 |
| L Terrell Consultancy Ltd | Professional & scientific | 2025 |
| Lacos Services Limited | Other services | 2018 |
| Ladbrook Limited | Professional & scientific | 1996 |
| Ladbrook Properties Ltd | Real estate | 2004 |
| Ladbrook Property Group Ltd | Real estate | 2023 |
| Ladbrook Property Investments Limited | Real estate | 2021 |
| Lala's Embroidery Ltd | Wholesale & retail | 2025 |
| Lamb Coil Limited | Professional & scientific | 2012 |
| Laura and Eric Lettings Ltd | Real estate | 2022 |
| Laurencekirk Tractor Maps Ltd | Manufacturing | 2024 |
| Lean Sigma Solutions Ltd | Professional & scientific | 2003 |
| Leask Property Investments Ltd | Real estate | 2025 |
| Leask Property Services Ltd | Construction | 2019 |
| LEE Hampton Fencing Ltd | Professional & scientific | 2013 |
| Lemcon (Angus) Limited | Professional & scientific | 1996 |
| Level UP Coaching Events Limited | Education | 2022 |
| Levelmake Limited | Administrative & support | 1992 |
| Levelup Supplements Limited | Wholesale & retail | 2026 |
| Lewaig Joinery Limited | Construction | 2010 |
| Lillyrose Pubs Ltd | Hospitality | 2024 |
| Lindsay Mccracken Ltd | Mining & quarrying | 2021 |
| LINE34 Ltd | Information & communication | 2024 |
| Links Hotel Montrose Limited | Hospitality | 1989 |
| Litua Ltd | Agriculture & fishing | 2022 |
| LMG Electrical Services Ltd. | Construction | 2022 |
| Lochside Bar Ltd | Hospitality | 2017 |
| Locovoco Limited | Information & communication | 2021 |
| LOK Well Services Ltd | Mining & quarrying | 2006 |
| Lomond Technology Ltd | Manufacturing | 2019 |
| Lorimer Cabs Ltd | Transport & logistics | 2018 |
| Lorimer Construction Ltd | Construction | 2014 |
| Lucian Taxis Ltd | Transport & logistics | 2023 |
| Lunan Well Services Ltd | Administrative & support | 2005 |
| M S Garden Engineering Services Limited | Professional & scientific | 2020 |
| M. Mann Joiners Ltd. | Construction | 2002 |
| MA Fishing & Re-Entry Consultants Ltd | Mining & quarrying | 2011 |
| Machine Tool Maintenance Ltd | Professional & scientific | 2003 |
| Mackenzie International Services Ltd | Mining & quarrying | 2017 |
| Mackenzie Petroleum Ltd | Mining & quarrying | 2013 |
| Mackieshaw Ltd | Transport & logistics | 2026 |
| Mackinnon Marine Limited | Professional & scientific | 2007 |
| Maclennan Project Development Ltd | Professional & scientific | 2016 |
| Madcat Life Ltd | Administrative & support | 2017 |
| Magi Transport Services Ltd | Transport & logistics | 2023 |
| Mainstay Training Limited | Professional & scientific | 2012 |
| Mallard Engineering Ltd | Other services | 2012 |
| Manorcroft Limited | Real estate | 2008 |
| Marine Construction Management Limited | Professional & scientific | 2020 |
| Marine Electrical Engineering Ltd | Mining & quarrying | 2014 |
| Mark Crichton Wealth Ltd | Professional & scientific | 2018 |
| Martin Burke P.D.R Ltd | Wholesale & retail | 2017 |
| Martin Milne Plumbing & Heating Ltd | Construction | 2025 |
| Mask Consultancy Limited | Professional & scientific | 2008 |
| Maslomar Limited | Professional & scientific | 2012 |
| Masson Energy Limited | Energy | 2011 |
| Material Reclamation Services Limited | Administrative & support | 2005 |
| Matstrading Ltd | Wholesale & retail | 2025 |
| MBM Property Holdings Limited | Real estate | 2025 |
| MBY Consultants Ltd | Professional & scientific | 2025 |
| MBY Metals Recycling UK Limited | Wholesale & retail | 2025 |
| Mcgregor Whisky Limited | Wholesale & retail | 2024 |
| MCK Construction Limited | Other services | 2009 |
| Mckay Engineering (Montrose) Ltd | Mining & quarrying | 2013 |
| Mckay Subsea Services Ltd | Mining & quarrying | 2004 |
| ME Practical Ltd | Professional & scientific | 2021 |
| Meadlands Geoconsulting Ltd | Professional & scientific | 2024 |
| Meadowstone Services Ltd | Professional & scientific | 2022 |
| Mearns Tree Services Ltd | Administrative & support | 2022 |
| Melchar Limited | Administrative & support | 2013 |
| Melissa ANN Ltd | Hospitality | 2022 |
| Merry Clan (Montrose) Limited | Hospitality | 2018 |
| Metal Warrior Miniatures Ltd | Manufacturing | 2021 |