| RT Site Services Ltd | Manufacturing | 2013 |
| Russley Park Investments Ltd | Real estate | 2021 |
| S W Electrical Diversity Limited | Manufacturing | 2011 |
| Safe Haven Homeless CIC | Health & social care | 2026 |
| Samana Music Ltd | Arts & recreation | 2018 |
| Savanna Elephant Ltd. | Arts & recreation | 2009 |
| Sea Better Ltd | Other services | 2020 |
| Seymour Glover Ltd | Administrative & support | 2005 |
| SG Farms Limited | Agriculture & fishing | 2009 |
| Sirius Objectives Ltd | Professional & scientific | 2020 |
| SKM Asset Finance Limited | Financial services | 1997 |
| Sleekstone Ltd | Hospitality | 2019 |
| SLJ Ventures Limited | Professional & scientific | 2020 |
| Snipe Technical Ltd | Manufacturing | 2022 |
| Sooner OR Later Limited | Information & communication | 2012 |
| SPB Rossiter Ltd | Professional & scientific | 2018 |
| Spinup Forge Limited | Professional & scientific | 2025 |
| SRT Designs Limited | Wholesale & retail | 2018 |
| ST Paul's Court Chipperfield Management Co. Limited | Real estate | 2006 |
| Star Seventysix Ltd | Manufacturing | 2024 |
| Starkey Developments Limited | Construction | 2023 |
| Straightline Snooker Ltd | Wholesale & retail | 2025 |
| STU Phillips K9 Ltd | Administrative & support | 2015 |
| Sunnyhill Glamping & Camping Ltd | Hospitality | 2022 |
| Systemau Injan Pluszero CYF. | Professional & scientific | 2023 |
| Tarbay Farm Limited | Agriculture & fishing | 2012 |
| Techssim Limited | Information & communication | 2011 |
| Teiars CWM TAF Valley Tyres Limited | Wholesale & retail | 2016 |
| Terra Modus Consultants Limited | Professional & scientific | 2014 |
| THE Bashō Project CIC | Education | 2025 |
| THE Bridal Lens Ltd | Information & communication | 2025 |
| THE Colledge Partnership LLP | | 2024 |
| THE H.M.S. Beagle Trust | Professional & scientific | 2008 |
| THE Magstim Company Limited | Manufacturing | 1988 |
| THE Money Store Group Limited | Financial services | 2026 |
| THE Money Store Limited | Financial services | 2026 |
| THE Moody COW Mobile Catering LLP | | 2013 |
| THE Mountain Food Company Ltd | Agriculture & fishing | 2011 |
| THE PAW Path Ltd | Wholesale & retail | 2025 |
| THE Plash Inn Limited | Hospitality | 2026 |
| THE Protection Twins Limited | Financial services | 2024 |
| THE Wealth House Limited | Financial services | 2026 |
| THE Yogic Breath Ltd | Health & social care | 2025 |
| Tir-Y-Gafel Ltd | Households | 2020 |
| Together Hendygwyn Gyda'N Gilydd CIC | Arts & recreation | 2023 |
| Traditional NO'8 Ltd | Hospitality | 2018 |
| Trans-Carbon Industries Ltd | Transport & logistics | 2020 |
| Treepeopleuk Limited | Agriculture & fishing | 2016 |
| Truman Clan Ltd | Manufacturing | 2024 |
| Truman Ventures LLP | | 2024 |
| Twose Farms Limited | Agriculture & fishing | 2003 |
| TY Gwennol CYF | Manufacturing | 2020 |
| UK Food Store Ltd | Wholesale & retail | 2016 |
| USG Limited | Wholesale & retail | 2009 |
| Velfrey Wines Ltd | Agriculture & fishing | 2016 |
| Villard-Coles Properties Ltd | Real estate | 2019 |
| W&W Hydroponics Ltd. | Wholesale & retail | 2013 |
| W3WEBDESIGNS Limited | Information & communication | 2006 |
| Water Meadows (Frogmore) Management Limited | Households | 1988 |
| Watling Property Services Limited | Construction | 1997 |
| Wave Healthcare Ltd | Wholesale & retail | 2024 |
| Ways With Wood Ltd. | Manufacturing | 2024 |
| Welsh Heritage Walnut Farm Ltd | Agriculture & fishing | 2025 |
| West Wales Autos Ltd | Wholesale & retail | 2025 |
| West Wales Biodiversity Information Centre Limited | Information & communication | 2006 |
| West Wales Garage Doors Ltd | Manufacturing | 2018 |
| White Rose Projects Limited | Construction | 2020 |
| Whitland CC Ltd | Arts & recreation | 2026 |
| Whitland Engineering Limited | Manufacturing | 1990 |
| Whitland EOT Trustee Limited | Professional & scientific | 2024 |
| Whitland Mechanical Engineering Ltd | Construction | 2025 |
| Whitland RFC Limited | Arts & recreation | 2018 |
| Whitland Shutters and Awnings Ltd | Wholesale & retail | 2021 |
| Windlec Ltd | Construction | 2023 |
| Wired Wood Limited | Professional & scientific | 2017 |
| Witt Holdings Ltd | Construction | 2018 |
| Woodacre Estates Ltd | Construction | 2024 |
| Wwpm Limited | Administrative & support | 2026 |
| WYN Davies Construction Ltd | Construction | 2025 |
| Wynne Phillips Truck Centre Ltd | Wholesale & retail | 2023 |