| Strongarm Services Ltd | Transport & logistics | 2025 |
| Studio Arden Ltd | Professional & scientific | 2026 |
| Studio FOS Ltd | Construction | 2021 |
| Studio H Consulting Limited | Professional & scientific | 2025 |
| Studley Lane 1967 Limited | Extraterritorial | 2014 |
| Summit Financial Consulting Limited | Professional & scientific | 2016 |
| Sunney Ltd | Hospitality | 2024 |
| Sunny Days Childrens Nursery Ltd | Other services | 2007 |
| Supervawt Ltd | Professional & scientific | 2009 |
| Sustainability Accounting Ltd | Professional & scientific | 2017 |
| SVB Services (Swindon) Limited | Construction | 2010 |
| SVO (Calne) Ltd. | Manufacturing | 2000 |
| Sweeps and Ladders Ltd | Administrative & support | 2023 |
| Swift Resolve Properties Ltd | Real estate | 2024 |
| Swindon Domestic Cleaning Services Limited | Households | 2004 |
| Swindon Nails & Spa Ltd | Other services | 2024 |
| Syrs Holdings Ltd | Financial services | 2021 |
| T Davis Building Ltd | Construction | 2011 |
| T Paget Legal Ltd | Professional & scientific | 2021 |
| T Radx Logistics UK Limited | Transport & logistics | 2020 |
| T&P Property Investments Ltd | Financial services | 2021 |
| Tabs Investments Limited | Real estate | 2014 |
| TAG UP Ltd | Financial services | 2021 |
| Taginternational.Co.Uk Ltd | Education | 2019 |
| Tagrecruitmentgroup Ltd | Administrative & support | 2019 |
| Takai Property Investment Limited | Real estate | 2021 |
| Take the Wheel Driving School Limited | Education | 2023 |
| Talos Companies Ltd | Real estate | 2016 |
| Tambookie Developments Ltd | Real estate | 2024 |
| Tambookie Group Ltd | Financial services | 2024 |
| Tanoa Communications Ltd | Professional & scientific | 2020 |
| Tansh Properties Ltd | Real estate | 2017 |
| Tappers & Trowels Ltd | Construction | 2024 |
| Taylor Conrad Investments Ltd | Real estate | 2021 |
| Taylor Holding Investments Ltd | Real estate | 2022 |
| Taylor Property Shepherd Ltd | Real estate | 2022 |
| Taylors Centre News Ltd | Wholesale & retail | 2019 |
| Tblc Solutions Ltd | Professional & scientific | 2023 |
| TCL Enterprises Limited | Real estate | 2016 |
| Tcpb Ltd | Construction | 2019 |
| TDV Surveying Ltd | Financial services | 2024 |
| Teal Properties Management Ltd | Real estate | 2019 |
| Team UP Ventures Ltd | Financial services | 2024 |
| Techoir Developments Limited | Real estate | 2024 |
| Techoir Limited | Professional & scientific | 2022 |
| Techsing Ltd | Information & communication | 2019 |
| Temple Green Properties Limited | Real estate | 2020 |
| Terra Ferus Ltd | Extraterritorial | 2023 |
| Terra Guard Technologies Limited | Other services | 2024 |
| Terry Goulding Carpentry Ltd | Construction | 2011 |
| THE Arde Tree Ltd | Professional & scientific | 2022 |
| THE Backgammon Cafe Ltd | Education | 2025 |
| THE Baleman Services Limited | Transport & logistics | 2006 |
| THE Barefoot Daddy Ltd | Arts & recreation | 2019 |
| THE Big Think Group Ltd | Professional & scientific | 2016 |
| THE Calne Foundation Trust | Education | 2012 |
| THE Daily Grind Coffee Shop Ltd | Wholesale & retail | 2025 |
| THE Daymer Bay Community Interest Company | Other services | 2018 |
| THE ENT Consultancy LLP | | 2014 |
| THE Fitness Box Limited | Arts & recreation | 2018 |
| THE Garden Edge Farm Limited | Agriculture & fishing | 2004 |
| THE Garden Restaurant Chippenham Limited | Hospitality | 2022 |
| THE Garden Store Limited | Administrative & support | 2024 |
| THE Gleam Team Wiltshire Ltd | Administrative & support | 2025 |
| THE Great British Clearance Company Limited | Transport & logistics | 2026 |
| THE Hideaway Beauty & Aesthetics Ltd | Other services | 2022 |
| THE JEH Group Ltd | Administrative & support | 2016 |
| THE Legal Locum Limited | Professional & scientific | 2011 |
| THE Little Photo Company Ltd | Professional & scientific | 2009 |
| THE London Property Sourcer Ltd | Information & communication | 2022 |
| THE Marketing MIX Ltd | Professional & scientific | 2025 |
| THE Old Dairy Management (Calne) Company Ltd | Households | 2002 |
| THE Old School House 1894 Company Limited | Households | 2023 |
| THE Old School House on the Green 1894 Company Limited | Households | 2023 |
| THE Old Woollen Mill Management Company Ltd | Households | 2026 |
| THE Orange Strawberry Learning & Development Company Ltd | Administrative & support | 2011 |
| THE Original Mindset Ltd | Wholesale & retail | 2025 |
| THE Oven Gleam Team Limited | Administrative & support | 1996 |
| THE Pasty Cove Ltd | Hospitality | 2021 |
| THE Pet's Butler (Secure Dog Fields) Ltd | Other services | 2024 |
| THE Pet's Butler Ltd | Other services | 2022 |
| THE Phonetics Group Ltd | Information & communication | 2019 |
| THE Travelling Theatre Ltd | Arts & recreation | 2022 |
| THE Treatment Rooms at Blacklands Mill House Ltd | Other services | 2020 |
| THE UK Genealogy Show Limited | Education | 2018 |
| THE Wheatsheaf Calne Ltd | Hospitality | 2018 |
| THE White Horse (Compton Bassett) Limited | Hospitality | 2011 |
| THE Willbott's Workshop Ltd | Manufacturing | 2021 |
| THE Wiltshire Stable Ltd | Hospitality | 2026 |
| Thescaleupcoach Ltd | Professional & scientific | 2026 |
| Thompson Capital Estates Ltd | Real estate | 2024 |
| Three Degrees South Ltd | Administrative & support | 2023 |
| Threshld Ltd | Arts & recreation | 2025 |
| Thuthuka Limited | Information & communication | 2004 |
| Tibi Construct Ltd | Construction | 2022 |
| Titans Product Design Ltd | Manufacturing | 2024 |
| Titrans Care Services Limited | Administrative & support | 2023 |
| Titrans Tech Limited | Information & communication | 2023 |
| TJS Storage Ltd | Real estate | 2024 |
| TNK Traders Ltd | Wholesale & retail | 2024 |