| Surviving Narcissistic Abuse Limited | Education | 2025 |
| Susan Elizabeth Parkinson Ltd | Extraterritorial | 2024 |
| Suss Housing Limited | Professional & scientific | 2019 |
| Sustainable Assured Safety Limited | Professional & scientific | 2015 |
| Sutton Benger Rugby Football Club Limited | Arts & recreation | 2012 |
| SVT Investments Ltd | Financial services | 2025 |
| SW Bathrooms Ltd | Wholesale & retail | 2025 |
| SW Maintenance Services Ltd | Professional & scientific | 2020 |
| Swales Haulage Limited | Professional & scientific | 1988 |
| Sway Project Controls Ltd | Professional & scientific | 2024 |
| Sweet Decision Ltd | Information & communication | 2012 |
| Sweet Legacy Equine Ltd | Agriculture & fishing | 2025 |
| Sweet Legacy Land Holdings LLP | | 2025 |
| Swindon and Wiltshire Local Enterprise Partnership Limited | Real estate | 2019 |
| Swindon Scaffolding Limited | Construction | 2024 |
| Swindon Water Softeners Ltd | Water & waste | 2023 |
| SWS Building Contractors Limited | Construction | 2002 |
| Symfoniae Ltd | Wholesale & retail | 2018 |
| Symmetry Athletics Limited | Wholesale & retail | 2017 |
| Synergy Art Limited | Wholesale & retail | 2000 |
| T J & a E Rawlings Limited | Agriculture & fishing | 2015 |
| T M Cleaning Services Newport Ltd | Administrative & support | 2018 |
| T Prades Limited | Construction | 2004 |
| T&D Earthworks Ltd | Construction | 2023 |
| T. & S. Element Ltd | Professional & scientific | 2025 |
| T2 Architects Limited | Professional & scientific | 2007 |
| Tachirica Care Ltd | Professional & scientific | 2015 |
| Tacklestore Limited | Administrative & support | 2002 |
| TAG Developments (South West) Limited | Construction | 2025 |
| Tagg Films Limited | Information & communication | 2015 |
| Tailored Advice Limited | Financial services | 2025 |
| Takston Limited | Manufacturing | 2025 |
| Tallo Group Limited | Financial services | 2023 |
| Tambla International Limited | Information & communication | 2015 |
| Tamper Kiln Limited | Information & communication | 2025 |
| TAN Electrics Ltd. | Construction | 2014 |
| Tangent Studio Limited | Professional & scientific | 2005 |
| Tangram IT & Accountancy Solutions Limited | Information & communication | 2017 |
| Tanuki Business Consulting Limited | Professional & scientific | 2015 |
| Tanyard Arts LLP | | 2022 |
| Taranto Systems Limited | Information & communication | 2020 |
| Target Sports Suppliers Limited | Wholesale & retail | 2023 |
| Tasil Fish and Chips Ltd | Hospitality | 2024 |
| Tatara Workshop Ltd | Manufacturing | 2017 |
| Tavinor Properties Limited | Real estate | 2020 |
| Taxi Hire UK Ltd | Transport & logistics | 2022 |
| Taylerson Limited | Professional & scientific | 2004 |
| Taylor Builders (Calne) Limited | Construction | 2009 |
| Taylor Hurst Ltd | Real estate | 2023 |
| TAZ Vans by Design Ltd | Wholesale & retail | 2021 |
| Tazi Productions Ltd | Information & communication | 2026 |
| TBM CAD Limited | Information & communication | 2012 |
| Tbsware Ltd | Information & communication | 2019 |
| TC and AB Brean Limited | Agriculture & fishing | 2014 |
| TC Landscaping and Surfacing Limited | Construction | 2021 |
| TCF (Wiltshire) Limited | Agriculture & fishing | 2006 |
| TE Leisure Ltd | Wholesale & retail | 2021 |
| Teachous Ltd | Education | 2024 |
| Teal-Barnett Limited | Real estate | 2015 |
| Team Dickinson Limited | Wholesale & retail | 2012 |
| Tech Engineering (Wiltshire) Ltd | Construction | 2017 |
| Techmiv Limited | Professional & scientific | 2018 |
| Technical Waterproofing Systems Limited | Administrative & support | 2002 |
| Technosync Ltd | Water & waste | 2017 |
| Techzen Limited | Information & communication | 2025 |
| Tectonica Design LAB Limited | Professional & scientific | 2017 |
| TEE Read Construction Limited | Construction | 2007 |
| Teejay Productions Limited | Information & communication | 2016 |
| TEF Consulting LLP | | 2008 |
| Teifi Valley Associates Ltd | Professional & scientific | 2026 |
| Tekcon Limited | Information & communication | 1999 |
| Tekeir Services UK Ltd | Construction | 2025 |
| Tektora Limited | Administrative & support | 2021 |
| Telo Communications Ltd | Information & communication | 2025 |
| Telo Fones Ltd | Construction | 2026 |
| Tempcore Projects Ltd | Construction | 2025 |
| Templar Electrical Installations Ltd | Construction | 2019 |
| Temple Street Finance Limited | Professional & scientific | 2008 |
| Tender Alchemy Ltd | Professional & scientific | 2017 |
| Tenin French Ltd | Professional & scientific | 2016 |
| Texsol Hygiene Limited | Professional & scientific | 1995 |
| TG Nutrition Limited | Wholesale & retail | 2023 |
| TGR Ventures Limited | Transport & logistics | 2002 |
| Thai Nhung Ltd | Other services | 2025 |
| Thames Valley Eggs (Production) Limited | Agriculture & fishing | 1988 |
| Thank Evans Domestic Electrics Ltd | Construction | 2025 |
| THE Accounting Xperts Limited | Professional & scientific | 2014 |
| THE Animal Physiotherapy Dispensary Limited | Wholesale & retail | 2015 |
| THE Audio Business Limited | Professional & scientific | 2019 |
| THE Aura Home Staging Ltd | Professional & scientific | 2025 |
| THE Avon Practice Limited | Health & social care | 2022 |
| THE Awesome Recruitment Company Ltd | Administrative & support | 2022 |
| THE Balloon Event Company Ltd | Wholesale & retail | 2021 |
| THE Banging Gardens of Habylon Limited | Administrative & support | 2015 |
| THE Barn Garden (Great ELM) Ltd | Real estate | 2025 |
| THE Bath Baby Consultancy Ltd | Health & social care | 2019 |
| THE Bath Holiday Company Limited | Hospitality | 2010 |
| THE Bay Tree (Chippenham) Home & Gifts Limited | Wholesale & retail | 2016 |
| THE Bear Garage (Atworth) Limited | Wholesale & retail | 2014 |
| THE Beaufort Clinic Limited | Health & social care | 2008 |