| Radon Scotland Limited | Water & waste | 2013 |
| RAY Knox Coaching Limited | Other services | 2023 |
| Redsurv Ltd | Professional & scientific | 2026 |
| Regrow Communities CIC | Education | 2026 |
| Research Relay Limited | Professional & scientific | 2005 |
| Rewilderness Ltd. | Professional & scientific | 2023 |
| Robert Craigie Ltd | Transport & logistics | 2012 |
| Rost Holdings Limited | Real estate | 2024 |
| Rousay Renewables Limited | Energy | 2005 |
| Rowanpoint Limited | Agriculture & fishing | 2017 |
| RSS Electrical Ltd | Construction | 2023 |
| Ryon Limited | Agriculture & fishing | 2005 |
| Rysa Lodge Partnership | | 1987 |
| S & J D Robertson Property Ltd. | Extraterritorial | 1970 |
| S J Garson Engineering Ltd | Professional & scientific | 2022 |
| S W Paterson & Co. Limited | Agriculture & fishing | 2003 |
| Sanday Community Craft Hub Ltd | Wholesale & retail | 2020 |
| Sanday Development Trust | Other services | 2004 |
| Sanday Vision Group Ltd | Financial services | 2025 |
| Sands Hotel (Orkney) Ltd | Hospitality | 2014 |
| Scott Norquoy Inshore Fishing Ltd | Agriculture & fishing | 2018 |
| Sea Chance Limited | Agriculture & fishing | 2021 |
| Sean Dennison | Agriculture & fishing | 2024 |
| Seatter Farm Partnership | | 2001 |
| Shane M Scott Ltd | Professional & scientific | 2012 |
| Shapinsay Development Trust | Other services | 2003 |
| Shapinsay Renewables Limited | Energy | 2009 |
| Skapa Mining Services Ltd. | Professional & scientific | 1998 |
| Soulisquoy Printmakers Limited | Arts & recreation | 1982 |
| Sourin Enterprises Ltd | Energy | 2011 |
| South Ronaldsay and Burray Development Trust | Other services | 2008 |
| Spiritual Assembly of the Baha'Is of Orkney Mainland East | Other services | 1979 |
| ST Clair Farms | Agriculture & fishing | 1997 |
| Start Point Ventures Ltd | Agriculture & fishing | 2023 |
| Steinberg Investments | Financial services | 2020 |
| Steinberg Ventures Limited | Real estate | 2015 |
| Stephen Rorie Ltd | Construction | 2005 |
| Sties Limited | Real estate | 2021 |
| Stroma Marine Services Ltd | Administrative & support | 2016 |
| Stromness Limited | Extraterritorial | 2006 |
| Stuart Tait Rope Access Limited | Construction | 2026 |
| Sudr Limited | Hospitality | 2020 |
| TERN360 Ltd | Professional & scientific | 2024 |
| THE Friends of ST Ninians | Other services | 2009 |
| THE Hospital Adventures Ltd | Arts & recreation | 2021 |
| THE Longhope Lifeboat Museum Trust | Arts & recreation | 2001 |
| THE Orkney Tile Company Ltd | Construction | 2011 |
| THE Pier Arts Centre | Arts & recreation | 2004 |
| THE Pitstop (Orkney) Limited | Wholesale & retail | 2005 |
| THE Strategy Collective Limited | Professional & scientific | 2019 |
| THE Stromness Alternative Limited | Education | 2023 |
| THE Valhalla Strength Coffee Cart Ltd | Hospitality | 2024 |
| THE Village Counsellor Ltd | Health & social care | 2021 |
| THE Yard Plant Nursery C.I.C. | Arts & recreation | 2020 |
| Therapy Through Horses CIC | Education | 2025 |
| Thorkell Community Trust Ltd | Other services | 2018 |
| Tommy Tulloch Limited | Agriculture & fishing | 2006 |
| Tour Orkney Ltd | Administrative & support | 2024 |
| Trowie Inn & Campsite Limited | Hospitality | 2026 |
| Tullock Marine Services Ltd | Transport & logistics | 2024 |
| Ursula Kelly Studio Ltd | Information & communication | 2025 |
| Vestrafiold Farm Limited | Agriculture & fishing | 2002 |
| Vortex Orkney Limited | Professional & scientific | 2023 |
| VS Distillers Limited | Manufacturing | 2016 |
| W & a Moar | | 1994 |
| W.H. Harvey Limited | Agriculture & fishing | 1955 |
| W.H.B. Sutherland Limited | Wholesale & retail | 1959 |
| Wardhay Limited | Hospitality | 2017 |
| Watersound Enterprises Limited | Administrative & support | 1991 |
| WE Frame IT Kirkwall Ltd. | Wholesale & retail | 2005 |
| West Bites Orkney Ltd | Hospitality | 2024 |
| West Brough Farm Limited | Agriculture & fishing | 2023 |
| Wester House Orkney Ltd | Agriculture & fishing | 2026 |
| Westlands (Orkney) Limited | Professional & scientific | 2007 |
| Westray Development Trust | Administrative & support | 1999 |
| Wild Orcadian Ltd | Hospitality | 2022 |
| Willowstream Ltd. | Hospitality | 1992 |
| Wynteg Limited | Information & communication | 2024 |