| Switch (Tenby) Limited | Wholesale & retail | 2021 |
| SWN Y DON Newgale Ltd | Hospitality | 2024 |
| SXL CK Ltd | Hospitality | 2025 |
| Sycamore Grove Management Company Limited | Real estate | 2005 |
| Symmonds Holdings Limited | Construction | 2021 |
| Symmonds Property Investments Ltd | Real estate | 2026 |
| Syren Shellfish Limited | Wholesale & retail | 2014 |
| T & S Motors (Pembs) Ltd | Wholesale & retail | 2003 |
| T Akinsola International Limited | Transport & logistics | 2023 |
| T E & M Francis & SON Limited | Agriculture & fishing | 2013 |
| TAF Valley Autoelectrics Limited | Wholesale & retail | 1996 |
| Taff Properties (2025) Limited | Real estate | 2025 |
| TAJ Mahal (Haverfordwest) Limited | Hospitality | 2014 |
| Talbenny Poultry Limited | Agriculture & fishing | 2020 |
| Talon Perfect Ltd | Other services | 2014 |
| Tanjibe Ltd | Administrative & support | 2025 |
| Tanxtui Ltd | Wholesale & retail | 2023 |
| TAP LAB Ltd | Other services | 2022 |
| Target Safety Ltd | Education | 2025 |
| Tarian Solutions Limited | Public administration | 2015 |
| Tawakkul Trading Ltd | Hospitality | 2024 |
| TC Investments Pembrokeshire Ltd | Financial services | 2026 |
| TCS Consulting Ltd | Hospitality | 2020 |
| TCW Renewables Limited | Construction | 2020 |
| TDT Admin & Consulting Ltd | Administrative & support | 2025 |
| TE1 Properties Limited | Real estate | 2026 |
| Team Gemini Project Management Ltd | Administrative & support | 2019 |
| Tebs Distribution Limited | Wholesale & retail | 2019 |
| Tec-Magex Ltd. | Professional & scientific | 1995 |
| Techno Point Ltd | Information & communication | 2013 |
| Technut Limited | Professional & scientific | 2012 |
| Teck Motion Ltd | Administrative & support | 2024 |
| Tecpinions Limited | Professional & scientific | 2004 |
| TEL Engineering and Fabrication Limited | Manufacturing | 2016 |
| Templetronics Ltd | Information & communication | 2003 |
| TEN Twenty-Two Catering Limited | Hospitality | 2023 |
| Tenby Candle Company Ltd | Wholesale & retail | 2024 |
| Tenby Flooring LLP | | 2025 |
| Tenby Stays Limited | Real estate | 2024 |
| Teranik Ltd | Other services | 2023 |
| Teulu Wellbeing and Child Therapy C.I.C. | Health & social care | 2025 |
| TF Housing Ltd | Real estate | 2025 |
| TFR Pharma Limited | Wholesale & retail | 2010 |
| TG Project Management and Consultancy Limited | Professional & scientific | 2026 |
| TH Racing Limited | Arts & recreation | 2017 |
| Thallon Property Ltd | Real estate | 2022 |
| That Lass Electrical Ltd | Construction | 2022 |
| THE Beyond Partnership Limited | Professional & scientific | 2003 |
| THE Bluetits Chill Swimmers C.I.C. | Arts & recreation | 2020 |
| THE BO Box Limited | Other services | 2025 |
| THE Box Catering Pembrokeshire Ltd | Hospitality | 2025 |
| THE Box Events & Catering Ltd | Hospitality | 2024 |
| THE Bridal Boutique (Narberth) Limited | Wholesale & retail | 2016 |
| THE British Association of Feed Supplement and Additive Manufacturers Limited | Other services | 1968 |
| THE Brook Inn Limited | Hospitality | 2014 |
| THE Brunch House Ltd | Hospitality | 2024 |
| THE Bull Inn (Pembrokeshire) Limited | Hospitality | 2025 |
| THE Cleaners Group Limited | Administrative & support | 2023 |
| THE Complete Compliance Group Ltd | Professional & scientific | 2023 |
| THE Cookhouse Pembs Ltd | Hospitality | 2021 |
| THE Copper HOG Ltd | Wholesale & retail | 2021 |
| THE Corner Piece Rubaxton Limited | Hospitality | 2018 |
| THE Darwin Centre for Biology and Medicine | Professional & scientific | 1993 |
| THE Development Company UK Limited | Other services | 2000 |
| THE EGG Shed Limited | Agriculture & fishing | 2005 |
| THE Ethical Candle Company Ltd | Extraterritorial | 2023 |
| THE Furniture Directory Ltd | Wholesale & retail | 2016 |
| THE Graylyns Ltd | Health & social care | 2015 |
| THE Hardwood LOG Company Limited | Agriculture & fishing | 1996 |
| THE Holliday in Ltd | Real estate | 2021 |
| THE Lions DEN Pembrokeshire Ltd | Education | 2012 |
| THE Nature Recovery Trust | Health & social care | 2024 |
| THE Olde Gift Company Limited | Wholesale & retail | 2025 |
| THE Pembrokeshire Beer Company Ltd | Hospitality | 2011 |
| THE Pembrokeshire Candle Company Ltd | Extraterritorial | 2023 |
| THE Pump on the Green Limited | Hospitality | 2009 |
| THE Red Car Theory Ltd | Information & communication | 2023 |
| THE Resilience Hub | Other services | 2018 |
| THE Saundersfoot Beach Company Limited | Real estate | 2017 |
| THE Savoury Shop Ltd | Wholesale & retail | 2024 |
| THE Shading Company Ltd | Wholesale & retail | 2024 |
| THE Shed Porthgain Limited | Hospitality | 2010 |
| THE Silver Lily Holdings Ltd | Real estate | 2025 |
| THE Silver Lily Ltd | Wholesale & retail | 2022 |
| THE Slate Centre Limited | Wholesale & retail | 2002 |
| THE Spice Box (Haverfordwest) Ltd | Wholesale & retail | 2014 |
| THE Spinal Frontier Limited | Health & social care | 2018 |
| THE Spud Box Pembrokeshire Ltd | Hospitality | 2025 |
| THE Swan Inn (Little Haven) Limited | Hospitality | 2007 |
| THE VEG Patch Limited | Agriculture & fishing | 2014 |
| THE Wickedly Welsh Chocolate Company Ltd | Manufacturing | 2013 |
| THE Wild Patch Ltd | Agriculture & fishing | 2026 |
| THE Wolfe Inn Wolfscastle Limited | Hospitality | 2021 |
| Therainbowjaguar Ltd | Arts & recreation | 2025 |
| Thermal Jackets Ltd | Manufacturing | 2024 |
| Thermavex Ltd | Construction | 2025 |
| Thomas & Thomas Financial Services Limited | Administrative & support | 2008 |
| Thornton Poultry Limited | Agriculture & fishing | 2020 |
| THP Land & Development Ltd | Administrative & support | 2020 |
| THV Stays Ltd | Real estate | 2026 |