| JS (Kilmacolm) Limited | Professional & scientific | 2015 |
| JSM Industries Ltd | Professional & scientific | 2024 |
| Justbricks Ltd | Real estate | 2024 |
| JWD Representation Ltd | Professional & scientific | 2025 |
| K & K Civil Engineering Limited | Construction | 2013 |
| Kalidug Foods Limited | Wholesale & retail | 2003 |
| Karmit Enterprises Limited | Professional & scientific | 2018 |
| KB Dental Limited | Health & social care | 2023 |
| KD Equine Services Ltd | Transport & logistics | 2017 |
| Keir Pharmacy Limited | Wholesale & retail | 2011 |
| Keith Plant Hire Limited | Administrative & support | 2002 |
| Kenavara Business Services Limited | Professional & scientific | 1995 |
| Kennedy Orthopaedics Limited | Health & social care | 2025 |
| Kepstorn Advisory & Consulting LLP | | 2011 |
| Kepstorn Limited | Administrative & support | 1997 |
| Kepstorn Solicitors Limited | Professional & scientific | 2011 |
| Key and Hammer Limited | Manufacturing | 2019 |
| Kilmacolm Wine Bar Ltd | Hospitality | 2022 |
| Kilmaraja Ltd | Hospitality | 2025 |
| Kingsacre Developments Limited | Administrative & support | 2015 |
| Kingsley Wood & Co. Letting and Estate Agents Limited | Real estate | 2016 |
| Kingsley Wood & Co. Solicitors Limited | Professional & scientific | 2008 |
| Kingsley Wood Limited | Professional & scientific | 2016 |
| Kittoch Street Properties Limited | Construction | 1991 |
| Klondike Capital UK Ltd | Financial services | 2026 |
| KM Safety & Operations Ltd. | Professional & scientific | 2024 |
| Knockbuckle Estates Limited | Construction | 2019 |
| Koh-I-Noor Restaurants Limited | Hospitality | 2001 |
| Kohala Holdings Ltd | Financial services | 2021 |
| KT Real Estate Holdings Limited | Real estate | 2024 |
| Last Sire Limited | Information & communication | 2018 |
| Latin Way Ltd | Professional & scientific | 2018 |
| Latoak Limited | Transport & logistics | 1987 |
| Legacy-Planning Ltd | Information & communication | 2022 |
| Leisure World East Kilbride Limited | Arts & recreation | 2016 |
| Leveraged Leadership Ltd | Professional & scientific | 2020 |
| Lister Coffee Co. Ltd | Manufacturing | 2020 |
| Livingstone Tavern Group Ltd | Hospitality | 2021 |
| Lloyds Ventures Ltd. | Real estate | 2013 |
| Loch & Lynx Ltd | Wholesale & retail | 2026 |
| Lochfyne Langoustines Ltd | Wholesale & retail | 2012 |
| Loganwood Group Limited | Financial services | 2016 |
| Loganwood Landholding Ltd | Real estate | 2023 |
| Loganwood Wind (High Mathernock) Limited | Energy | 2013 |
| Loganwood Wind (Overton) Ltd | Agriculture & fishing | 2022 |
| Loganwood Wind Limited | Energy | 2012 |
| Logic Marketing (LMI) Limited | Wholesale & retail | 2005 |
| Logos Logistics Ltd | Manufacturing | 2003 |
| Lucas Investments Ltd | Real estate | 2022 |
| Luminara Properties Ltd | Real estate | 2025 |
| Lupo Watches Ltd | Wholesale & retail | 2025 |
| Lynn Mcculloch Limited | Professional & scientific | 2015 |
| Lynton House Dental Limited | Health & social care | 2016 |
| M S Johnston (Joiners and Builders) Limited | Construction | 2003 |
| MAC Cleaning Services (Edinburgh) Limited | Other services | 2015 |
| MAC Storage Limited | Real estate | 2021 |
| MAC Storage Renfrew Limited | Real estate | 2024 |
| Machair Creative Limited | Professional & scientific | 2025 |
| Magothy Consulting UK Ltd | Professional & scientific | 2020 |
| Management Moves Ltd | Professional & scientific | 2013 |
| Martin Investment Group Limited | Households | 2020 |
| MBR Travel Ltd | Administrative & support | 2025 |
| Mccall Developments Limited | Real estate | 2002 |
| Mccall Group Limited | Construction | 2015 |
| Mckenzie Project Construction Limited | Construction | 2017 |
| Mcmillan Project Services Limited | Professional & scientific | 2012 |
| Mcphee Staffing Ltd. | Administrative & support | 2024 |
| Micmacmed Ltd | Health & social care | 2020 |
| Millpond Kilmacolm Ltd | Real estate | 1963 |
| Mj's Braehead Ltd | Hospitality | 2022 |
| MM Technical Services Limited | Construction | 2025 |
| Morehames Limited | Real estate | 2025 |
| MSA Subs Ltd | Hospitality | 2020 |
| Natural Capital Analysis Limited | Administrative & support | 2012 |
| Nature in Mind Ltd. | Administrative & support | 2008 |
| NEO Orthopaedics Limited | Health & social care | 2019 |
| Newtonfirst Group Limited | Administrative & support | 2017 |
| Nolans Bar Ltd. | Hospitality | 2012 |
| North Atlantic Minerals Limited | Mining & quarrying | 2012 |
| ON Track Training & Coaching Limited | Professional & scientific | 2003 |
| OP Consultancy Ltd | Other services | 2024 |
| Opptagon Ltd | Wholesale & retail | 2015 |
| Ormidale Courtyard Rental Limited | Hospitality | 2017 |
| Ormidale House Rental Limited | Hospitality | 2017 |
| Orsay Bishopton Limited | Construction | 2019 |
| Outcome Delivery Experts Limited | Professional & scientific | 2017 |
| Overlar Ltd | Information & communication | 2021 |
| Oxford Cancer Biomarkers Limited | Health & social care | 2010 |
| Oyster Enterprises Limited | Transport & logistics | 2008 |
| P & B Builders (Glasgow) Ltd | Construction | 2002 |
| PAB Enterprise Ltd | Hospitality | 2017 |
| Pannencake Limited | Hospitality | 2022 |
| Paper Plane Printing Services Ltd | Manufacturing | 2025 |
| Peter Noble Glazing Company Limited | Construction | 2002 |
| PG Paper Company Ltd. | Wholesale & retail | 2003 |
| Plastic Entertainment Limited | Real estate | 2015 |
| Pogbie Wind Farm (Grid) Limited | Energy | 2017 |
| Poppycat 11 Limited | Professional & scientific | 2015 |
| Porterfield Residential Ltd | Real estate | 2020 |
| Porterfield Services Ltd | Professional & scientific | 2020 |