| A & G Installs Limited | Energy | 2015 |
| A & L Wilson Ltd | Financial services | 2024 |
| A C Marine Services Ltd | Transport & logistics | 2024 |
| A Cromarty Engineering Ltd | Professional & scientific | 2018 |
| A Monkman PT Ltd | Arts & recreation | 2025 |
| A.J.B. Scholes Limited | Professional & scientific | 2008 |
| ABM Orkney Ltd | Professional & scientific | 2024 |
| AC Agri Sales Ltd | Administrative & support | 2024 |
| Accommodation Orkney Ltd | Real estate | 2026 |
| Advocacy Orkney | Other services | 2002 |
| Aegis-Scot Archaeology Ltd. | Construction | 2017 |
| AGE Scotland Orkney | Other services | 2003 |
| Aikerness Marine Services Ltd | Agriculture & fishing | 2015 |
| Alens & Kabir Ltd | Wholesale & retail | 2019 |
| Alens & Shuki Ltd | Hospitality | 2020 |
| Amakim Ltd | Hospitality | 2024 |
| Andrew Sinclair Limited | Construction | 2011 |
| Andrew Smith Holdings Ltd | Financial services | 2026 |
| Apoteknik Limited | Health & social care | 2016 |
| Aras Mobile Barber Ltd | Other services | 2021 |
| Arkylyn Marine Ltd | Transport & logistics | 2025 |
| Artmachine Graphics Ltd | Manufacturing | 2009 |
| ASK01 Ltd | Real estate | 2026 |
| ASK02 Ltd | Real estate | 2026 |
| Aska Energy Systems Ltd | Energy | 2025 |
| AVI8 International Ltd | Professional & scientific | 2026 |
| Ayre Hotel (Kirkwall) Limited | Hospitality | 1999 |
| B B Mechanical Services Ltd | Construction | 2017 |
| Bagerhat Ltd | Hospitality | 2018 |
| Bain Consulting Group Ltd | Professional & scientific | 2020 |
| Bernie Reddington Garden Services Ltd | Other services | 2017 |
| Berstane Limited | Construction | 2023 |
| Boabhan Sith Books Ltd | Information & communication | 2026 |
| Braehead Engineering (Westray) Limited | Agriculture & fishing | 2009 |
| Breck Designs Limited | Professional & scientific | 2006 |
| Brian Wilson (Orkney) Limited | Wholesale & retail | 2008 |
| Brims Tidal Energy Limited | Professional & scientific | 2023 |
| Brodgar Properties Ltd | Hospitality | 2020 |
| Bruces Stores | Wholesale & retail | 2025 |
| Brundee Limited | Real estate | 2023 |
| Burland (Orkney) Limited | Transport & logistics | 2018 |
| Burton Whelan Ltd | Professional & scientific | 2021 |
| C & R Spence Ltd. | Real estate | 2010 |
| CAE Properties Ltd | Real estate | 2016 |
| Caledonia Serviced Accommodation Limited | Real estate | 2024 |
| Camusmor Marine Services Limited | Professional & scientific | 2017 |
| Captains House (Kirkwall) Ltd | Wholesale & retail | 2022 |
| Casey Construction Limited | Manufacturing | 1983 |
| Castaway Dunes (Self Catering) Ltd | Hospitality | 2025 |
| CB Pahnke Management Services Ltd | Professional & scientific | 2014 |
| Charlie Kemp Services Limited | Professional & scientific | 2015 |
| Clouston Capital Partners Limited | Real estate | 2024 |
| Clouston Commerce Limited | Wholesale & retail | 2024 |
| Clouston Enterprises Limited | Financial services | 2024 |
| Clouston Holdings Ltd | Financial services | 2026 |
| Cookie REA Ltd | Wholesale & retail | 2024 |
| Coopertek Limited | Mining & quarrying | 2014 |
| Corpower Ocean Limited | Professional & scientific | 2017 |
| Craigie Engineering Limited | Manufacturing | 1993 |
| Craigies Taxis Limited | Transport & logistics | 2011 |
| CRC Advisory Ltd | Professional & scientific | 2020 |
| Crossroads Care Orkney Limited | Health & social care | 1996 |
| Crunchers Limited | Extraterritorial | 2010 |
| Custom House (Property) Limited | Real estate | 2017 |
| D & W Accommodation | Hospitality | 2024 |
| D7 Capital Ltd | Professional & scientific | 2022 |
| Dandhlaw Limited | Professional & scientific | 2020 |
| Davidson's Cabs Ltd | Transport & logistics | 2026 |
| Deviate Energy Limited | Professional & scientific | 2022 |
| Deviate Illumination Ltd | Manufacturing | 2020 |
| DH Construction Orkney Ltd | Construction | 2025 |
| Distilx Ltd | Professional & scientific | 2021 |
| DLM Welding & Fabrication Ltd | Manufacturing | 2019 |
| Donaldsons of Orkney | Manufacturing | 2022 |
| DW Developments (Orkney) Ltd | Construction | 2022 |
| E Foil Orkney Ltd | Wholesale & retail | 2022 |
| EDJ Advisory Limited | Administrative & support | 2018 |
| Ekinzeyneb Ltd | Hospitality | 2018 |
| Emiliart Ltd | Wholesale & retail | 2022 |
| Emma Robertson Freelance Media Ltd | Information & communication | 2012 |
| Employability Orkney | Administrative & support | 2005 |
| Enjoy Orkney Limited | Administrative & support | 2014 |
| Eugo Games Limited | Manufacturing | 2013 |
| Experience Orkney Limited | Administrative & support | 2026 |
| FIN Marine Ltd | Transport & logistics | 2025 |
| Finmory Ltd | Financial services | 2026 |
| Firth Holdings Ltd | Real estate | 2017 |
| Flett Enterprises Limited | Hospitality | 2019 |
| Fluke Jewellery Limited | Manufacturing | 2020 |
| Foveran Hotel Limited | Hospitality | 2000 |
| G&D Clark Property Holdings Limited | Financial services | 2023 |
| G.C. & A.C. Stout LLP | | 2010 |
| G.R.S. Marine Services Ltd | Professional & scientific | 2011 |
| Gnoss LLP | | 2026 |
| Golder (Orkney) Ltd | Administrative & support | 2013 |
| Grimsetter 2024 Ltd | Energy | 2025 |
| Grimsetter Limited | Energy | 2013 |
| Grooves Live Limited | Wholesale & retail | 2002 |
| Guaranteed Property Company Limited | Real estate | 1960 |
| GWA (Orkney) Ltd | Wholesale & retail | 2025 |