| Robin Brydone Curling Ltd | Arts & recreation | 2026 |
| Rokest Limited | Hospitality | 2010 |
| Ross Whyte Ltd | Arts & recreation | 2026 |
| Rural Valets Ltd | Administrative & support | 2023 |
| Ryan Construction (Scotland) Ltd | Construction | 2015 |
| Ryky Therm Limited | Construction | 2019 |
| S & a Adams Limited | Agriculture & fishing | 2018 |
| S & a Housing Support Services Limited | Health & social care | 2015 |
| S L Clark Donnelly Ltd | Other services | 2023 |
| Sandmill MOT Centre Ltd | Wholesale & retail | 2011 |
| Scotch Fried Chicken Ltd | Hospitality | 2023 |
| SEN Stranraer Ltd | Hospitality | 2025 |
| Sgwvalets Ltd | Administrative & support | 2026 |
| Slavin Construction Ltd | Construction | 2014 |
| Slavin Plant Hire Ltd | Construction | 2014 |
| Sloan Properties (Stranraer) Ltd | Real estate | 2026 |
| Slockmill and Inshanks Farms Limited | Agriculture & fishing | 1954 |
| Soleburn Garden Centre Ltd | Extraterritorial | 2023 |
| Sonas Energy Ltd. | Energy | 2013 |
| South West Lettings (Stranraer) Limited | Real estate | 2003 |
| Sscs Collective Ltd | Hospitality | 2023 |
| Star Regen Ltd | Construction | 2025 |
| Stranraer & Rhins of Galloway Agricultural Society Limited | Other services | 2002 |
| Stranraer Dental Laboratory Limited | Health & social care | 2011 |
| Stranraer Fresh Meats Ltd | Wholesale & retail | 2022 |
| Stranraer Kebab House Limited | Hospitality | 2019 |
| Stranraer Millennium Centre Community Trust | Administrative & support | 1998 |
| Stranraer Property Ltd | Hospitality | 2025 |
| Stranraer Skills Station Ltd | Education | 2015 |
| Structure Forge Ltd | Professional & scientific | 2021 |
| Sumax Property Limited | Hospitality | 2025 |
| Sunnymeade Caravan Park Limited | Hospitality | 2017 |
| SVM Port Services Ltd | Construction | 2010 |
| SW Competitions Ltd | Arts & recreation | 2025 |
| SWC Haulage Ltd | Transport & logistics | 2024 |
| Syed Phone Repairs Limited | Wholesale & retail | 2025 |
| T MCF Drummond (Barbeth) Limited | Agriculture & fishing | 2007 |
| Team Mouat Ltd | Arts & recreation | 2023 |
| Team Waddell Ltd | Arts & recreation | 2025 |
| Team Whyte Ltd | Arts & recreation | 2024 |
| THE Cairn Resilience & Welfare Group Ltd | Hospitality | 2024 |
| THE Caledonian Cheese Company Limited | Manufacturing | 1994 |
| THE Carpet Company (Galloway) Limited | Wholesale & retail | 2011 |
| THE Firm of High Craigcaffie Farm | | 2001 |
| THE Furniture Project (Stranraer) Ltd. | Water & waste | 1997 |
| THE Lady Bay Lodge Company Limited | Hospitality | 2022 |
| THE Old Church Portpatrick Ltd | Hospitality | 2016 |
| THE Phone DOC Lanrak Limited | Hospitality | 2022 |
| THE Portpatrick Brewery Ltd | Manufacturing | 2014 |
| THE PUB Bar Diner Limited | Hospitality | 2015 |
| THE Ship Inn at Drummore Limited | Hospitality | 2021 |
| Thepartyfairyevents Ltd | Hospitality | 2025 |
| Thompson Welding & Fabrication Ltd | Construction | 2015 |
| Tone and TAN Stranraer Ltd | Other services | 2024 |
| Topping Construction Limited | Construction | 2013 |
| Torbet Plant Hire Limited | Construction | 2012 |
| Torbet Welding Ltd | Professional & scientific | 2025 |
| Torrance Farms Limited | Agriculture & fishing | 1961 |
| Tractor & Machinery Ltd | Wholesale & retail | 2019 |
| Tres Chic Management Ltd | Extraterritorial | 2018 |
| Tufton Arms Restaurant Ltd | Hospitality | 2026 |
| TWO1 Investments Ltd | Real estate | 2021 |
| Uktradeautos Ltd. | Wholesale & retail | 2025 |
| Usmani@ Sphere Ltd | Wholesale & retail | 2026 |
| Vance Electrical Services Limited | Construction | 2016 |
| VNA Florals Ltd | Administrative & support | 2021 |
| W J F Ramsay Limited | Other services | 2008 |
| W. & S. Ramsay Limited | Agriculture & fishing | 1960 |
| Warwick Farms Ltd | Agriculture & fishing | 2026 |
| West Coast Utilities & Civils Ltd | Construction | 2026 |
| West Galdenoch Dairy Ltd | Agriculture & fishing | 2024 |
| Wheelieshine Ltd | Administrative & support | 2025 |
| Wigbay Slipway Company Limited | Real estate | 2017 |
| Wigtownshire Community Transport Limited | Transport & logistics | 2008 |
| Wildwood Tree Co. Ltd | Administrative & support | 2025 |
| William C. Mcmillan (Stranraer) Limited | Real estate | 1980 |
| William Loch Ltd | Wholesale & retail | 2016 |
| William Mitchell Transport Limited | Transport & logistics | 2019 |
| Yyad Limited | Hospitality | 2026 |