| Paymán Holdings 16 Ltd | Real estate | 2025 |
| Pomona Marine Limited | Transport & logistics | 2021 |
| R.S. Merriman Limited | Construction | 1993 |
| Reflex Orkney Limited | Other services | 2019 |
| Rendall Cloud Solutions Ltd | Information & communication | 2025 |
| RM Computing (Orkney) Limited | Information & communication | 2001 |
| RM IT Services (Orkney) Limited | Information & communication | 2022 |
| RM IT Services Limited | Information & communication | 2022 |
| RM Managed IT Services (Orkney) Limited | Information & communication | 2022 |
| RM Managed IT Services Limited | Information & communication | 2022 |
| Scapa Flow Futures Limited | Professional & scientific | 2021 |
| Scientific Underwater Logistics and (Sula) Diving Limited | Professional & scientific | 2003 |
| Seafront Orkney Cottages LLP | | 2019 |
| Seawise Solutions Ltd | Agriculture & fishing | 2019 |
| Sinclair Marine Services Ltd | Agriculture & fishing | 2018 |
| STR Marine Services Ltd | Transport & logistics | 2019 |
| Stromabank Hotel Longhope Limited | Hospitality | 2024 |
| Stromness Community Development Trust | Other services | 2006 |
| Stromness Developments Ltd | Construction | 2021 |
| Stromness Golf Club Limited (the) | Arts & recreation | 1924 |
| Stromness Property Services Ltd | Construction | 2019 |
| Stromness Tours Ltd | Administrative & support | 2011 |
| Stronsay Tidal Limited | Professional & scientific | 2017 |
| THE European Marine Energy Centre Limited | Manufacturing | 2003 |
| THE Island of HOY Development Trust | Administrative & support | 2006 |
| Thomson Civil & Engineering Ltd | Construction | 2021 |
| Tormiston Farms | Agriculture & fishing | 2025 |
| Vidacomm Services LLP | | 2022 |
| Ward Hill Homes Limited | Construction | 2015 |
| Whaup Limited | Information & communication | 2023 |
| Wild Isle Rope Access Services Ltd | Professional & scientific | 2022 |
| Wind Legacy Ltd | Energy | 2021 |
| Yetlin Caterers Limited | Hospitality | 2008 |