| Hoole Ventures Limited | Professional & scientific | 2026 |
| Hoole Yacht Services Ltd | Manufacturing | 2023 |
| Hottub.Scot Ltd | Wholesale & retail | 2021 |
| House Essentials Limited | Wholesale & retail | 2024 |
| Hutton Electrical Services Ltd | Construction | 2019 |
| I & S Property LLP | | 2012 |
| I Like Candy (Helensburgh) Ltd. | Wholesale & retail | 2010 |
| IAN G Walker Limited | Construction | 2016 |
| IC Transformations Limited | Professional & scientific | 2016 |
| Iemg Ltd | Real estate | 2025 |
| Iffluent Ltd | Water & waste | 2020 |
| Ijhospitality Ltd | Professional & scientific | 2026 |
| Imagineering Dreams Ltd | Wholesale & retail | 2023 |
| Impact Rise Ventures Ltd | Administrative & support | 2021 |
| Imperium Trading Combine Ltd | Financial services | 2025 |
| Inchgarvie Limited | Professional & scientific | 2023 |
| Ingenious Art Ltd | Manufacturing | 2023 |
| Innovate Rural Ltd | Professional & scientific | 2021 |
| Intermezzo Sports Ltd | Professional & scientific | 2022 |
| Inverallan Consulting Ltd | Professional & scientific | 2025 |
| Iplanwealth Limited | Financial services | 2026 |
| Irnaz & Co Ltd | Wholesale & retail | 2021 |
| Isea Limited | Real estate | 2006 |
| J R Care Academy Limited | Health & social care | 2017 |
| J.E.M. Haulage Ltd | Transport & logistics | 2018 |
| Jackfrost Hvac Ltd | Construction | 2021 |
| Jafmarvlin Labs Ltd | Information & communication | 2025 |
| Jcld Limited | Professional & scientific | 2013 |
| Jcld Properties Limited | Real estate | 2021 |
| Jelly Legs GIN Ltd | Wholesale & retail | 2024 |
| JH Storage Ltd | Transport & logistics | 2026 |
| JIM Mcmillan Offshore Services (ROV) Ltd. | Professional & scientific | 2018 |
| JJ Parcels Ltd | Transport & logistics | 2021 |
| JK & LE Lettings Limited | Real estate | 2025 |
| Joan's Carers Limited | Health & social care | 2003 |
| Joed Ltd | Information & communication | 2026 |
| Johnstone Projects (UK) Limited | Professional & scientific | 2021 |
| Joseph Callaghan (Butchers) Limited | Real estate | 1979 |
| JPM Electrical (Helensburgh) Ltd | Construction | 2022 |
| JSR Letting Ltd | Hospitality | 2023 |
| JTN Logistics Ltd | Transport & logistics | 2025 |
| Just Members Limited | Information & communication | 2014 |
| JXN Marketing Limited | Professional & scientific | 2023 |
| K Spittal Limited | Construction | 2020 |
| Kachina Developments Ltd | Real estate | 2021 |
| Kachina Investments Ltd | Real estate | 2020 |
| Kelvinston Property Limited | Real estate | 2012 |
| Kendall Property Management Ltd. | Real estate | 2000 |
| Kevin Birt Ltd | Professional & scientific | 2025 |
| Kevin Mccrea Limited | Construction | 2015 |
| Kickstart My Heart Ltd | Wholesale & retail | 2023 |
| Kimdouggley Limited | Hospitality | 1988 |
| Kinship Lettings Limited | Real estate | 2025 |
| Kirkmichael Mini Market Limited | Wholesale & retail | 2016 |
| Kirkmichael Shop Ltd | Wholesale & retail | 2022 |
| Klara Communications Ltd | Professional & scientific | 2023 |
| Kris Sanders Ltd | Financial services | 2023 |
| KW Building & Joinery Limited | Construction | 2015 |
| L.C. Roofing Ltd. | Construction | 2003 |
| Lafferty Properties (Helensburgh) Limited | Households | 2019 |
| Laggary Limited | Professional & scientific | 2023 |
| Lambda Ecosse RF Limited | Professional & scientific | 2016 |
| Landau Properties Limited | Real estate | 2021 |
| Latham Consulting Ltd | Professional & scientific | 2017 |
| Lavender and Rose Limited | Wholesale & retail | 2017 |
| LCA Cleaners Ltd | Administrative & support | 2026 |
| Lees Hospitality Ltd | Hospitality | 2026 |
| LG Express Limited | Wholesale & retail | 2017 |
| Liam Chambers Golf Ltd. | Arts & recreation | 2018 |
| Lifestyle Park Homes Scotland Ltd | Hospitality | 2018 |
| Linda Hunter Consulting Services Ltd | Professional & scientific | 2018 |
| Little Yellow Dog Ltd | Hospitality | 2016 |
| LIZ Wilson Copywriting & Communications Limited | Professional & scientific | 2019 |
| LMN Letting Limited | Real estate | 2026 |
| LNB Consulting Limited | Professional & scientific | 2020 |
| Local Tyre Services Limited | Wholesale & retail | 2017 |
| Loch Lomond and the Trossachs National Park Local Support Group | Other services | 2008 |
| Loch Lomond Developments Limited | Construction | 2021 |
| Loch Lomond Property Limited | Real estate | 2022 |
| Loch View Properties Ltd | Real estate | 2020 |
| Lomond Anaesthesia Ltd | Health & social care | 2025 |
| Lomond Contracting Services Ltd | Professional & scientific | 2018 |
| Lomond Engineering Management Limited | Wholesale & retail | 2008 |
| Lomond Grey Limited | Information & communication | 2018 |
| Lomond Land Surveys Ltd. | Professional & scientific | 1986 |
| Lomond Letting Limited | Real estate | 2009 |
| Lomond Paper Co. Limited | Wholesale & retail | 2025 |
| Lomond Psychology Ltd | Health & social care | 2026 |
| Lomondrail Ltd | Professional & scientific | 2024 |
| Lornal Limited | Professional & scientific | 2010 |
| Loughrey Associates (Scotland) Ltd | Professional & scientific | 2025 |
| Loulou's Limited | Wholesale & retail | 2017 |
| Loulous Website Limited | Hospitality | 2020 |
| LOW Carbon Developments Limited | Construction | 2014 |
| LPL Catering Limited | Hospitality | 2024 |
| Luxe Wealth Consulting Limited | Professional & scientific | 2025 |
| LWS Services Ltd | Agriculture & fishing | 2023 |
| M and E Vision Marketing Ltd | Professional & scientific | 2026 |
| M C J Accountancy Services Ltd | Professional & scientific | 2013 |
| M&Jhelensburgh Limited | Hospitality | 2025 |