| A.G. Appliances Limited | Wholesale & retail | 2001 |
| A.I. Properties Caithness Ltd | Real estate | 2025 |
| AJ Escapes Ltd | Real estate | 2026 |
| Alix Groundwork Ltd | Construction | 2025 |
| Balbeg Renewables Ltd | Administrative & support | 2025 |
| Begg’S Engineering Ltd | Professional & scientific | 2025 |
| Brian Trafford Limited | Construction | 2021 |
| Bruce Todd Ltd | Agriculture & fishing | 2016 |
| Caithness & Sutherland Vintage & Classic Vehicle Club Ltd | Other services | 1986 |
| Caithness Motocross Club Ltd | Arts & recreation | 2010 |
| Cameron Consulting (Rural) Ltd | Professional & scientific | 2022 |
| Chris Ross Country Services Limited | Agriculture & fishing | 2019 |
| Clashaig Repairs Ltd | Manufacturing | 2024 |
| Cloak and Dagger Studios Ltd | Arts & recreation | 2022 |
| Denny Munro Mechanical Services Ltd | Professional & scientific | 2022 |
| Elly's Beauty Studios Ltd | Other services | 2024 |
| Flow North Limited | Arts & recreation | 2021 |
| Forse Farms Ltd | Agriculture & fishing | 2010 |
| Fuelbee Ltd | Wholesale & retail | 2012 |
| G & J Coghill Properties Ltd | Real estate | 2025 |
| G S Contracts Ltd | Construction | 2014 |
| G Sutherland Properties Ltd | Construction | 2026 |
| G T Builders (Caithness) Ltd | Construction | 2015 |
| GOW Aggregates Limited | Mining & quarrying | 2018 |
| GOW Agricultural Ltd | Agriculture & fishing | 2018 |
| GOW Group Limited | Financial services | 2024 |
| GOW Plant Limited | Construction | 2012 |
| Halkirk Services Ltd | Agriculture & fishing | 2018 |
| Hamilton Kevill Highland Properties Ltd | Real estate | 2021 |
| I Mackay Joiner & Contractor Limited | Construction | 2014 |
| J & G Sutherland Ltd | Wholesale & retail | 2011 |
| John Mackay Ltd | Construction | 2004 |
| Kennedy Highland Homes Ltd | Real estate | 2025 |
| Lichen Caithness Ltd | Agriculture & fishing | 2021 |
| Locard Homes Limited | Construction | 2025 |
| LWC Events Ltd | Administrative & support | 2024 |
| M & J Cook (Holdings) Limited | Agriculture & fishing | 2025 |
| M Mackay Services Ltd | Construction | 2026 |
| Meadowfields Farm Ltd | Wholesale & retail | 2010 |
| MEM Rentals Ltd | Real estate | 2026 |
| Messrs G S Donn Ltd | Wholesale & retail | 2022 |
| MJR Engineering & Technical Services Ltd | Professional & scientific | 2024 |
| Modris K Property Ltd | Financial services | 2023 |
| Modris Ltd | Administrative & support | 2025 |
| Modris Mk's Auto Tectonic Limited | Wholesale & retail | 2022 |
| MOK Security Solutions Ltd | Administrative & support | 2019 |
| Moray Groundwork & Fencing Ltd | Construction | 2022 |
| Morris Motors Caithness Ltd | Wholesale & retail | 2024 |
| Norbloc Construction Ltd. | Construction | 2008 |
| Norfrost Holdings Limited | Manufacturing | 1964 |
| Peatcense Limited | Manufacturing | 2013 |
| Phoenician Risk and Resilience Ltd | Professional & scientific | 2025 |
| PR6 Services Limited | Manufacturing | 2016 |
| Roreka Venison Ltd | Wholesale & retail | 2021 |
| Saea Investments Limited | Real estate | 2025 |
| Sentry Industrial Safety Ltd | Professional & scientific | 2018 |
| Spintronics Limited | Professional & scientific | 2007 |
| THE Caithness Aromatics Co. Ltd | Manufacturing | 2024 |
| Tister Wind Farm LLP | | 2010 |
| Williamson Solutions Ltd | Agriculture & fishing | 2012 |