| Seaboard Memorial Hall Ltd | Arts & recreation | 2001 |
| Seaboard Properties & Services Ltd | Construction | 2020 |
| Seaboard Scaffolding Limited | Construction | 2012 |
| Seafield Highland Plumbing Solutions Ltd | Construction | 2023 |
| Seafood EAT Food Ltd | Wholesale & retail | 2020 |
| Seafood Marketing Services Ltd | Wholesale & retail | 2022 |
| Seaport Limited | Professional & scientific | 2008 |
| Sermack Ltd | Manufacturing | 2026 |
| Shamrock Thistle Limited | Manufacturing | 2022 |
| Shearer Hotels Limited | Hospitality | 2014 |
| Shearer Investments Limited | Hospitality | 2014 |
| Shearer Investments Limted Ltd | Hospitality | 2021 |
| Shearer's Garage Ltd | Wholesale & retail | 2010 |
| Shepherd Safety Services Ltd | Administrative & support | 2017 |
| Shieldaig Export Limited | Wholesale & retail | 1996 |
| Shieldaig Shellfish Limited | Agriculture & fishing | 1994 |
| Shona’S Kitchen Ltd | Manufacturing | 2025 |
| Shore Hotel LLP | | 2025 |
| Silverback Gym and Fitness Ltd | Arts & recreation | 2013 |
| Silvertide Fish and Chips Shop Ltd | Hospitality | 2017 |
| Silverwells Deer Management Ltd | Agriculture & fishing | 2022 |
| SJM Joinery & Roofing Ltd | Construction | 2019 |
| Skea Projects Limited | Administrative & support | 2014 |
| Skelbo BEE Works Ltd. | Construction | 2024 |
| Skinner ALL Trades Services Limited | Construction | 2012 |
| Skinner Plant and Agri Ltd | Construction | 2026 |
| SMJ Electrical Ltd. | Construction | 2025 |
| Softfit Ltd | Information & communication | 2020 |
| Specialist Exploration Services (Scotland) Ltd. | Administrative & support | 2010 |
| ST Scaffolding Solutions Limited | Construction | 2018 |
| Stanyer Cleaning Services Ltd | Administrative & support | 2013 |
| Star Inn Tain (2023) Ltd | Hospitality | 2023 |
| Stepping Stones Nursery (Tain) Ltd. | Education | 2009 |
| Steven Duff Ltd | Administrative & support | 2022 |
| Stewart Dingwall Ltd | Construction | 2026 |
| Stoer Developments Ltd | Administrative & support | 2022 |
| Strathappin Ltd | Financial services | 2021 |
| Stravaig Estates Ltd | Real estate | 2025 |
| Streampunk Media Ltd | Information & communication | 2016 |
| Struan's Landscaping & Groundworks Services Ltd | Administrative & support | 2012 |
| Sublime Forestry Ltd | Agriculture & fishing | 2022 |
| Sunnyside Tanning Studio Limited | Other services | 2024 |
| Sustainable Agricultural Solutions Group Ltd | Administrative & support | 2019 |
| Sutherland Holiday Lodges Ltd. | Hospitality | 2018 |
| Sutherland House (Dornoch) Limited | Hospitality | 1991 |
| Sutherland Plant Services Ltd. | Administrative & support | 2009 |
| Sydenham Technical Services Ltd | Professional & scientific | 2023 |
| T & L Tiling Ltd. | Professional & scientific | 2006 |
| T Sutherland Transport Ltd | Administrative & support | 2017 |
| T4 Forestry Ltd | Agriculture & fishing | 2024 |
| T4 Forestry Services Ltd | Other services | 2016 |
| Tain & District Bike Track Association CIC | Arts & recreation | 2023 |
| Tain Bothy Ltd | Wholesale & retail | 2019 |
| Tain Chinese Ltd | Hospitality | 2025 |
| Tain Green Energy Ltd | Professional & scientific | 2022 |
| Tain Heritage Trust | Other services | 1998 |
| Tain Hill Contracting Ltd | Construction | 2019 |
| Tain Investments Limited | Real estate | 2001 |
| Tain Management, Plant and Rigging Ltd | Administrative & support | 2019 |
| Tain Ropes Ltd | Construction | 2017 |
| Tain Slating Ltd | Administrative & support | 2016 |
| Tain Tanning Salon Ltd | Health & social care | 2017 |
| Tala. Studio Ltd | Other services | 2025 |
| Talmine Joiners Ltd. | Agriculture & fishing | 2006 |
| Tarrel Retreats Ltd | Hospitality | 2023 |
| THE Adventure Cafe Tain Limited | Hospitality | 2025 |
| THE Beauty Lounge Tain Ltd | Other services | 2026 |
| THE Community Sanctuary at Stoer Ltd | Administrative & support | 2022 |
| THE Durness BUS Ltd | Administrative & support | 2012 |
| THE Highland Larder Limited | Hospitality | 2020 |
| THE Ordie Inspection Ltd. | Professional & scientific | 2024 |
| THE Print Register Limited | Manufacturing | 1997 |
| THE Recycling BIN Company Limited | Extraterritorial | 2007 |
| THE Tarbat Community Hall Group | Arts & recreation | 2003 |
| Thermobore Limited | Construction | 2020 |
| Thistle Builders Ltd | Construction | 2026 |
| Thistle Developments Group Ltd | Administrative & support | 2025 |
| Thistle Excursions Ltd | Administrative & support | 2019 |
| Tidech Ltd | Administrative & support | 2024 |
| Tmjpc Ltd | Other services | 2022 |
| Torridon Smolts Limited | Agriculture & fishing | 1986 |
| Toulvaddie Distillery Limited | Manufacturing | 2015 |
| TT Cleaning Services (Scotland) Ltd | Administrative & support | 2024 |
| Tucks Joinery Ltd | Construction | 2024 |
| Twentyonebarber Ltd | Other services | 2021 |
| Tyre & Auto Limited | Wholesale & retail | 2010 |
| UK Putange Supplies Ltd | Agriculture & fishing | 2025 |
| V Cormack Pipefitting Services Ltd. | Administrative & support | 2009 |
| Vamace Ltd. | Administrative & support | 2009 |
| Vanholten Tailored Interiors Ltd | Professional & scientific | 2026 |
| Vass Access Limited | Construction | 2024 |
| Vatisker Hydro Ltd | Administrative & support | 2023 |
| Verification Ltd | Administrative & support | 2021 |
| Viewrigg Limited | Professional & scientific | 2011 |
| Waverley Engineering (Scotland) Ltd | Administrative & support | 2015 |
| Weldarc Ltd | Manufacturing | 2022 |
| Wellside Engineering Consulting Ltd | Professional & scientific | 2007 |
| Westfleet Limited | Administrative & support | 2002 |
| White House Farm Systems Ltd | Professional & scientific | 2026 |
| William Duff & Sons Ltd. | Transport & logistics | 2003 |