| Jeanfield Mini Mart Ltd | Wholesale & retail | 2021 |
| Jejo Enterprises Limited | Wholesale & retail | 2025 |
| Jennifer Mcgregor Communications Ltd | Professional & scientific | 2019 |
| Jesfor Limited | Real estate | 2012 |
| Jetarrow Properties Limited | Real estate | 2025 |
| JG Creative Group Limited | Professional & scientific | 2024 |
| JGC Investments Perth Limited | Real estate | 2020 |
| Jiaveron First Nominees | | 1990 |
| JIM Butcher Limited | Professional & scientific | 2010 |
| Jimmy Bones Construction Ltd | Construction | 2026 |
| Jims Mowing (Perthshire) Limited | Other services | 2011 |
| JJB Perth Limited | Construction | 2016 |
| Jjhn Ltd | Professional & scientific | 2022 |
| Jjnb (Properties) Ltd | Real estate | 1984 |
| JJW Groundworks & Civils Ltd | Construction | 2023 |
| JL Party Events Ltd | Arts & recreation | 2025 |
| JL Stone Optics Ltd | Health & social care | 2022 |
| JMG Perth Limited | Other services | 2021 |
| JNT Nails Ltd | Wholesale & retail | 2021 |
| JNW Services Limited | Real estate | 2024 |
| JOE Horne Joinery Ltd | Manufacturing | 2023 |
| Joelato Events Ltd | Hospitality | 2025 |
| Joelato Ltd | Manufacturing | 2022 |
| John Alan (Hairdressing) Limited | Other services | 1972 |
| John Barry Consulting Ltd | Administrative & support | 2024 |
| John Colver Tours Ltd | Administrative & support | 2026 |
| John Handling Ltd | Professional & scientific | 2024 |
| John Smith & SON (Electrical Contractors) Ltd. | Construction | 2015 |
| John Wilson & Sons Limited | Construction | 2007 |
| Johnson Allan Consulting Limited | Professional & scientific | 2017 |
| Joiner Logic Limited | Construction | 2022 |
| JON Law Architectural Technician Ltd. | Professional & scientific | 2012 |
| Jons Projects Ltd | Professional & scientific | 2015 |
| JR Analytics Ltd | Information & communication | 2025 |
| JT HV Services Ltd | Construction | 2023 |
| JT Services Property Maintenance Ltd | Construction | 2018 |
| Jtco Limited | Manufacturing | 2018 |
| JTHOMPSON55 Ltd | Construction | 2026 |
| Jumpr Ltd | Information & communication | 2019 |
| Jura Health Limited | Health & social care | 2010 |
| Justus Corporate Ltd | Financial services | 2006 |
| K Manston Properties Ltd | Construction | 2025 |
| K Mcara Process Ltd | Professional & scientific | 2016 |
| K&R Roadmarkings Ltd | Construction | 2026 |
| K.S. Manders International Transport Ltd. | Transport & logistics | 2002 |
| Kalico Consulting Ltd. | Other services | 2017 |
| Kanaka Global Ltd | Health & social care | 2025 |
| Kardom Ltd | Hospitality | 2024 |
| Katalyst Business Consulting Limited | Professional & scientific | 2015 |
| Katalyst Property Letting Limited | Real estate | 2019 |
| Katie Long Limited | Hospitality | 2021 |
| Katy in the Kitchen Ltd | Manufacturing | 2022 |
| Kaza UK Limited | Wholesale & retail | 2016 |
| Kbmb Properties Ltd | Real estate | 2026 |
| KCJ Leisure Ltd | Wholesale & retail | 2023 |
| Kcpt Online Limited | Arts & recreation | 2023 |
| Kcpt Yoga Limited | Arts & recreation | 2023 |
| KDM Contracting Limited | Agriculture & fishing | 2010 |
| Keep IT Simple Timing Ltd. | Arts & recreation | 2018 |
| Keep Right Traffic Management Consultants Ltd | Extraterritorial | 2010 |
| Keepsafe Storage Centres Limited | Real estate | 1999 |
| Keillour Collection Limited | Wholesale & retail | 2017 |
| Keillour Farms Limited | Agriculture & fishing | 2025 |
| Keir + Co Ltd | Professional & scientific | 2017 |
| Keith Careers Limited | Professional & scientific | 2014 |
| Keith Mitchell Law Accountants Limited | Professional & scientific | 2021 |
| Keith Sherrit Ltd | Construction | 2012 |
| Keith Sherrit Properties Limited | Real estate | 2020 |
| Kelbie Contracts Ltd | Construction | 2021 |
| Kelisa Construction & Civil Engineering Ltd | Construction | 2024 |
| Kelmara Contracts Ltd | Construction | 2026 |
| Keltneyburn Hydro Ltd | Energy | 2002 |
| Kemweld Ltd | Construction | 2024 |
| Ken's Angels Ltd | Other services | 2016 |
| Kenavara Consulting Limited | Professional & scientific | 2023 |
| Kenneth Maclean Limited | Information & communication | 2006 |
| Kenny Shaw Joinery Services Limited | Construction | 2023 |
| Kennyho Ltd | Professional & scientific | 2023 |
| Kenya Consulting Limited | Professional & scientific | 2026 |
| Kenzington Limited | Construction | 1985 |
| Keptie Property Limited | Real estate | 2022 |
| Keri Weatherhogg Ltd. | Administrative & support | 2011 |
| Kevin Cuthbert Limited | Arts & recreation | 2023 |
| Kevin Cuthbert Personal Training Ltd | Arts & recreation | 2019 |
| Key Express Ltd | Wholesale & retail | 2026 |
| KF Barber’S Ltd | Other services | 2020 |
| KFC 2022 Ltd | Wholesale & retail | 1991 |
| KGB Marketing Limited | Wholesale & retail | 2006 |
| Khaled Consultancy Ltd | Professional & scientific | 2020 |
| Khan Productions Limited | Wholesale & retail | 2025 |
| Khasd Ltd. | Other services | 2017 |
| Kiaer Estates Limited | Agriculture & fishing | 2016 |
| KIC (Holdings) Limited | Agriculture & fishing | 1999 |
| KIC Inventories Limited | Wholesale & retail | 2014 |
| Kids Art Class Ltd | Education | 2025 |
| Kilgour Construction Company Limited | Construction | 2015 |
| Kilgour Developments Ltd | Construction | 2017 |
| Kilminster Retail Ltd. | Wholesale & retail | 2013 |
| Kilted Property Limited | Real estate | 2024 |
| Kiltyrie Farm (Stewart) | | 1997 |