| Simply Seafoods Limited | Agriculture & fishing | 2016 |
| Siop Bwyd Cymru CYF | Wholesale & retail | 2023 |
| Sky Mountain Media Limited | Professional & scientific | 2013 |
| Skycamwales Limited | Information & communication | 2013 |
| Skymountain Studio Ltd | Arts & recreation | 2021 |
| SM Taylor Property Developments Limited | Real estate | 2023 |
| Smith Grinds Ltd | Manufacturing | 2024 |
| Softys Tenby Ltd | Hospitality | 2026 |
| Sound Stories CIC | Education | 2022 |
| South & West Properties Limited | Real estate | 2018 |
| South Beach (Management Company) Limited | Real estate | 2011 |
| South Ridgeway Community Association | Education | 2011 |
| South Terrace Developments Limited | Construction | 2012 |
| Southbay Apartments Limited | Administrative & support | 2000 |
| Southbeach Court (Tenby) Limited | Households | 2005 |
| Sovereign Antiques Wales Ltd | Wholesale & retail | 2026 |
| SPACE3EOT Limited | Professional & scientific | 2023 |
| Sparta House Management Company Limited | Households | 1989 |
| Spetchley House Management Company Limited | Households | 2013 |
| Springfields Fresh Produce (Manorbier) Limited | Agriculture & fishing | 1991 |
| Sqwod Ltd | Wholesale & retail | 2023 |
| ST Cyprian Management Company Limited | Households | 2020 |
| ST Florence Holiday Lodges Limited | Hospitality | 2018 |
| ST Marys Properties ( Tenby) Ltd | Real estate | 2016 |
| ST Nicholas Court (Tenby) Limited | Real estate | 2017 |
| ST Nons Apartments Management Company Limited | Households | 2004 |
| ST. Catherine's Management Company (Tenby) Limited | Hospitality | 1992 |
| ST. Florence Parade Management Limited | Households | 1991 |
| Stage Door Hospitality Ltd | Hospitality | 2025 |
| Stars Collection Limited | Hospitality | 2024 |
| Summer Inns Limited | Hospitality | 1980 |
| Sunnie Side Ltd | Wholesale & retail | 2024 |
| Surf Centre Ltd | Real estate | 1987 |
| Susie's Sheepskin Boots Ltd | Manufacturing | 2025 |
| Synergy Civils Ltd | Construction | 2025 |
| T P Byrne UK Limited | Hospitality | 2017 |
| T. P. Hughes and SON Limited | Wholesale & retail | 1959 |
| Taffy and Jock Ltd | Extraterritorial | 2024 |
| Tall Ships Management Company Limited | Households | 2007 |
| Tamarix (Tenby) Limited | Other services | 2003 |
| Taynex Solutions Ltd | Professional & scientific | 2026 |
| Tees R US (HW) Limited | Wholesale & retail | 2014 |
| Tees-R-Us Ltd | Wholesale & retail | 2011 |
| Tenby and County Club Company,Limited(The) | Arts & recreation | 1876 |
| Tenby Blues CIC | Arts & recreation | 2010 |
| Tenby Bookshop (Tenby) Limited | Wholesale & retail | 2011 |
| Tenby Bowling Club Limited | Arts & recreation | 1924 |
| Tenby Brewing Co. Bar Holdings Ltd | Hospitality | 2016 |
| Tenby Brewing Co. Limited | Manufacturing | 2014 |
| Tenby Chamber of Trade and Tourism | Other services | 2025 |
| Tenby Coasteering Ltd | Administrative & support | 2017 |
| Tenby Estates Limited | Wholesale & retail | 1996 |
| Tenby Fish Bar Limited | Hospitality | 2021 |
| Tenby Fishing Ltd | Agriculture & fishing | 2023 |
| Tenby Food and Drink Limited | Hospitality | 2023 |
| Tenby Golf Club Ltd | Arts & recreation | 2020 |
| Tenby Harbour Snack Bar Ltd | Hospitality | 2024 |
| Tenby Health Ltd | Health & social care | 2023 |
| Tenby Memories Limited | Hospitality | 2021 |
| Tenby Sailing Club Limited | Other services | 2013 |
| Tenby Stores Limited | Wholesale & retail | 2014 |
| Tenby Town Members Bowling Club Ltd | Hospitality | 2023 |
| Tenby United RFC Ltd | Arts & recreation | 2016 |
| TH Adventure Solutions Ltd | Administrative & support | 2019 |
| THE Billycan Tenby Limited | Hospitality | 2023 |
| THE Buccaneer (Tenby) Limited | Households | 2003 |
| THE Chem Inn (Saundersfoot) Limited | Hospitality | 2022 |
| THE Edge Hair Cutting Limited | Other services | 2003 |
| THE Flowerbed (Wales) Limited | Other services | 2025 |
| THE Goldwait Group Limited | Hospitality | 2024 |
| THE Ground Tenby CIC | Real estate | 2026 |
| THE Guildhall Tenby Management Company Limited | Construction | 2011 |
| THE Little Nook Tenby Limited | Wholesale & retail | 2025 |
| THE Little Pantry Tenby Limited | Wholesale & retail | 2025 |
| THE Mount Penally Management Company Ltd | Households | 2013 |
| THE Natural Paper Company Ltd | Wholesale & retail | 2022 |
| THE Nook Tenby Limited | Manufacturing | 2015 |
| THE Orchards (Llanfoist) Management Company Limited | Households | 2022 |
| THE Round House Consultancy Ltd | Professional & scientific | 2025 |
| THE Street Kitchen Pembs Ltd | Hospitality | 2025 |
| THE Tenby Chocolate & Fudge Co Ltd | Wholesale & retail | 2021 |
| THE Tenby Ghost Company Limited | Wholesale & retail | 2024 |
| THE Tenby Project CIC | Health & social care | 2016 |
| Tidewell Capital Advisory Limited | Financial services | 2025 |
| Tidewell Developments Ltd | Construction | 2021 |
| Tidewell Holdings EXT Ltd | Financial services | 2026 |
| Tidewell Holdings Ltd | Financial services | 2021 |
| Tidewell Lettings Ltd | Real estate | 2025 |
| Tidewell Properties Ltd | Hospitality | 2020 |
| Tiller Safety Services Limited | Professional & scientific | 2012 |
| TKO Events UK Ltd | Hospitality | 2024 |
| Top Beef Limited | Hospitality | 2021 |
| Total Protect Solutions Ltd | Professional & scientific | 2018 |
| Trade Canvas Print Limited | Wholesale & retail | 2012 |
| Train for Life Ltd | Arts & recreation | 2024 |
| Tredeml Print Limited | Information & communication | 2012 |
| Trubloc Limited | Manufacturing | 2000 |
| Trueform Civil Engineering Ltd | Construction | 2010 |
| Trueform EOT Limited | Administrative & support | 2025 |
| Trueform Group Limited | Construction | 2011 |