| THE Vale W3 Limited | Construction | 2021 |
| THE Waldron Partnership Ltd | Professional & scientific | 2009 |
| THE Watson Gym Ltd | Arts & recreation | 2016 |
| THE Way Inspirations Ltd | Wholesale & retail | 2022 |
| THE Wellbeing Garden Ltd | Health & social care | 2022 |
| THE Wheelwrights (Tunley) Management Company Limited | Households | 2021 |
| THE Whent Limited | Wholesale & retail | 2010 |
| THE Whole Bagel Ltd | Hospitality | 2007 |
| THE Whole Child Approach Ltd | Education | 2026 |
| THE Willowfalls Management Company Limited | Households | 2009 |
| THE Wilsher Group Limited | Professional & scientific | 1993 |
| THE Wind in Your Sails LLP | | 2025 |
| THE Winsper Group Ltd | Real estate | 2013 |
| THE Wooden TIE Company Limited | Wholesale & retail | 2008 |
| THE World Professional Billiards and Snooker Association (Players) Limited | Arts & recreation | 2020 |
| THE Yard in Bath Ltd | Hospitality | 2020 |
| THE Zenith Partnership Ltd | Professional & scientific | 2004 |
| THE Zone (Temple Quay) Management Company Limited | Households | 2005 |
| Theaperobar Ltd | Hospitality | 2023 |
| Theatre Macabre Limited | Information & communication | 2026 |
| Theatre Royal Bath (Trading) Limited | Other services | 1989 |
| Theatre Royal Bath Enterprises Limited | Arts & recreation | 1982 |
| Theatre Royal Bath Limited(The) | Arts & recreation | 1979 |
| Theclickscompany Ltd | Professional & scientific | 2011 |
| Thefitgroup Limited | Arts & recreation | 2013 |
| Thema Financial Services Limited | Financial services | 2021 |
| Then NOW When LLP | | 2026 |
| Thenatco Ltd | Professional & scientific | 2025 |
| Therabode Ltd | Hospitality | 2024 |
| Theraipy Limited | Health & social care | 2024 |
| Therapists' Staff Room Limited | Health & social care | 2024 |
| Therapy Geek Ltd | Professional & scientific | 2024 |
| Theripplescompany Limited | Professional & scientific | 2016 |
| Thermae Development Company Limited | Other services | 1997 |
| Thermae Properties Ltd | Real estate | 2022 |
| Theva Consultancy Ltd | Information & communication | 2023 |
| Theva Limited | Real estate | 2008 |
| Theva Trading Ltd | Wholesale & retail | 2024 |
| Think Beautiful Design Limited | Professional & scientific | 2016 |
| Think Thoughtful Limited | Manufacturing | 2008 |
| Thinkfully Limited | Professional & scientific | 2018 |
| Third AGE Advisory Ltd | Professional & scientific | 2023 |
| Third House Limited | Administrative & support | 2021 |
| Thirteen Rivers Street Management Company Limited | Real estate | 2015 |
| This IS Magazine Limited | Information & communication | 2014 |
| This IS US Limited | Information & communication | 2009 |
| Thisaway Limited | Professional & scientific | 2019 |
| Thomas Burnford Architectural Design and Development Limited | Professional & scientific | 2013 |
| Thomas Fortin Limited | Wholesale & retail | 2018 |
| Thomas Properties Management Limited | Real estate | 2020 |
| Thompson Acquisitions Limited | Wholesale & retail | 2006 |
| Thorne & Quarry Developments Limited | Construction | 2025 |
| Thorneloe Rengen (Church Walk) Limited | Real estate | 2018 |
| Thornton Land and Developments Ltd | Construction | 2024 |
| Thorsten ORR Limited | Professional & scientific | 2011 |
| Those Beyond Limited | Information & communication | 2021 |
| Those Beyond Studios Limited | Administrative & support | 2021 |
| Those Little Donuts Ltd | Hospitality | 2025 |
| Threadgold Bence Limited | Construction | 1986 |
| Threadline Creatives Ltd | Information & communication | 2025 |
| Threadneedles Hotel Limited | Financial services | 2016 |
| Three Ways School | Education | 2013 |
| Thrings Trustee Company Limited | Professional & scientific | 2010 |
| Thrive Bath Ltd | Wholesale & retail | 2023 |
| Thrive Financial & Business Consultancy Ltd | Professional & scientific | 2022 |
| Thrive Sports Co Limited | Administrative & support | 2023 |
| Thriving Ecosystems Ltd | Professional & scientific | 2018 |
| Thurdleigh Planning Consultancy Ltd | Professional & scientific | 2011 |
| Tick Care Consultancy Ltd | Other services | 2024 |
| Tickitto AI Ltd | Information & communication | 2017 |
| Tiffany Tomato Limited | Arts & recreation | 2018 |
| Tiger Alliance Ltd | Administrative & support | 2022 |
| Tiger Makine Mühendislik Sanayi Ticaret Limited Sirketi Ltd | Real estate | 2025 |
| Tiger Martial Arts Ltd | Arts & recreation | 2014 |
| Tile & Flooring Centre Limited | Construction | 2008 |
| TIM Bowles Ltd | Professional & scientific | 2025 |
| TIM Dunn Films Ltd | Information & communication | 2017 |
| TIM Greensmith Architects Limited | Wholesale & retail | 2025 |
| TIM Harris (Properties) Limited | Professional & scientific | 1980 |
| TIM Weaver Books Limited | Information & communication | 2009 |
| Timatic Limited | Wholesale & retail | 1973 |
| Time Bank Plus Ltd | Health & social care | 2008 |
| Time Broker Finance Limited | Administrative & support | 1998 |
| Time Commercial Finance Limited | Other services | 2016 |
| Time Finance PLC | Financial services | 2006 |
| Time Hard Asset Finance Limited | Financial services | 2006 |
| Time Honoured Limited | Information & communication | 2020 |
| Time Invoice Finance Limited | Financial services | 2007 |
| Time Machine Designs Ltd | Information & communication | 2023 |
| Time Property Finance Limited | Financial services | 2021 |
| Time Vendor Finance Limited | Financial services | 1987 |
| Timepiece Trade Limited | Wholesale & retail | 2021 |
| Timetrail Limited | Arts & recreation | 2020 |
| Timo Private Hire Bath Ltd | Administrative & support | 2025 |
| Timothy Associates Limited | Professional & scientific | 1993 |
| Timothy Fine Art Ltd | Arts & recreation | 2021 |
| Timothy James Consultancy Limited | Financial services | 2025 |
| Timsbury Childcare Limited | Health & social care | 2026 |
| Timsbury Service Station Ltd | Wholesale & retail | 2022 |
| Timsbury Workshop Estate Limited | Real estate | 2013 |