| Sun WIN Limited | Professional & scientific | 2019 |
| Sunbow Advisory Services Ltd | Professional & scientific | 2014 |
| Sundial, Waverley & Ravencliff Trading Limited | Wholesale & retail | 2023 |
| Sunflower Estates SW Ltd | Real estate | 2007 |
| Sung Total Ltd | Information & communication | 2022 |
| Sungur Acar 68 Ltd | Hospitality | 2024 |
| Sunhouse Creative Group Ltd | Financial services | 2024 |
| Sunhouse Creative Ltd | Administrative & support | 2007 |
| Sunny Glen Management Company Ltd | Households | 2025 |
| Sunnystar Limited | Health & social care | 2012 |
| Sunset House Limited | Real estate | 2004 |
| Sunset Ridge Road Management Company Ltd | Households | 2013 |
| Supernatural UK Productions Ltd | Information & communication | 2025 |
| Superpirates Ltd | Education | 2019 |
| Superstar Limited | Other services | 2021 |
| Supple Studio Limited | Professional & scientific | 2013 |
| Supplyline C.N.C. Limited | Professional & scientific | 1995 |
| Supporting Women Ltd | Professional & scientific | 2023 |
| Supreme Building Bath Ltd | Hospitality | 2025 |
| Supremeindiankitchen Ltd. | Hospitality | 2018 |
| Surfimage Limited | Professional & scientific | 1999 |
| Surfs UP Holiday Rental Ltd | Hospitality | 2022 |
| Surround Concept Ltd | Manufacturing | 2021 |
| Sursum Group Limited | Real estate | 2022 |
| Sursum Vestry Ltd | Real estate | 2019 |
| Susan Bull Limited | Real estate | 2007 |
| Susie Aust Communications Limited | Administrative & support | 2014 |
| Sustainability for Housing Limited | Other services | 2021 |
| Sutton's Scuff Solutions Limited | Wholesale & retail | 2025 |
| SVN Properties Ltd | Real estate | 2017 |
| SW Executive Cars Ltd | Transport & logistics | 2025 |
| SW Rendering & Insulation Ltd | Construction | 2024 |
| Swanrill Ltd | Real estate | 2016 |
| Sweet Little Things Bakery Limited | Manufacturing | 2022 |
| Sweet Little Things Ltd | Hospitality | 2018 |
| Sweet Street Desserts Limited | Wholesale & retail | 1995 |
| Sweets & Treats Bath Ltd | Wholesale & retail | 2024 |
| Sweetskills Limited | Wholesale & retail | 2013 |
| Swept Away (Bath) Limited | Administrative & support | 2006 |
| Swettenham Estates (UK) Limited | Real estate | 1997 |
| Swift Jones Ltd | Real estate | 2010 |
| Swift-Cussen Holdings Ltd | Financial services | 2022 |
| Swimbabies Limited | Education | 2021 |
| Swimtech Group Ltd | Administrative & support | 2024 |
| Swish Fish Limited | Extraterritorial | 2013 |
| SWJ ALE & Food Company Limited | Hospitality | 2018 |
| SWJ Cottages Ltd | Hospitality | 2023 |
| SWJ Properties Ltd | Real estate | 2022 |
| Swoon Gelato Ltd | Manufacturing | 2016 |
| Swords Traffic Management Limited | Administrative & support | 2006 |
| SWT Bath Limited | Wholesale & retail | 2018 |
| Sycamore Sanctuary Limited | Real estate | 2005 |
| Sydney House (Bath) Management Limited | Households | 1984 |
| Syjc Limited | Real estate | 2019 |
| Sylvester Easton Capital Ltd | Real estate | 2025 |
| Sylvester Easton Properties Ltd | Real estate | 2020 |
| Sylvester Groves Ltd | Professional & scientific | 2023 |
| Symposia Marquees Ltd | Administrative & support | 2019 |
| Synio Ltd | Manufacturing | 2023 |
| Synthesis Wealth Management Limited | Professional & scientific | 2020 |
| Synwoods UK Limited | Hospitality | 2015 |
| Systemsweave Ltd | Information & communication | 2025 |
| T C Consulting Limited | Information & communication | 1996 |
| T D Future Investments Limited | Real estate | 2021 |
| T H Law Limited | Extraterritorial | 2020 |
| T M a Haulage Limited | Transport & logistics | 2011 |
| T Mclean-Foreman Limited | Administrative & support | 2002 |
| T W Maths Limited | Education | 2010 |
| T&S Property Services Ltd | Construction | 2023 |
| T-Cup Ltd | Information & communication | 2019 |
| T-Rex Technology Ltd | Information & communication | 2022 |
| T. R. Hayes Limited | Wholesale & retail | 1973 |
| T.A.P Plumbing and Heating Bath Limited | Construction | 2019 |
| T.P.M. (South West) Limited | Construction | 2002 |
| T.W. Building (Bath) Ltd | Construction | 2021 |
| T3 Triathlon Limited | Extraterritorial | 2020 |
| Tabbitt & Olivier Limited | Hospitality | 2016 |
| TAD Residential Lettings Ltd | Real estate | 2026 |
| Tadman Planning Consultants Ltd | Professional & scientific | 2022 |
| TAG (SW) Limited | Construction | 2014 |
| Tagine Zhor Limited | Hospitality | 2013 |
| Tagster 2005 Limited | Wholesale & retail | 2005 |
| Tagster Limited | Wholesale & retail | 2005 |
| Taiga Consultancy Limited | Professional & scientific | 2017 |
| Taigh Companion Ltd | Information & communication | 2024 |
| Taiken Health Ltd | Wholesale & retail | 2025 |
| Tailored Management Support Ltd | Administrative & support | 2025 |
| Take Charge Bikes Ltd | Wholesale & retail | 2011 |
| Taking Steps Limited | Education | 2024 |
| Takk Consulting Ltd | Information & communication | 2014 |
| Talent Elevation Ltd | Professional & scientific | 2025 |
| Talking Issues Limited | Information & communication | 2006 |
| Tall Solutions Limited | Other services | 2016 |
| Tallis of Bath Limited | Wholesale & retail | 2007 |
| Tammy Potter Ltd | Professional & scientific | 2019 |
| Tamsin Clarke Limited | Arts & recreation | 2014 |
| Tangerine Skies Ltd | Hospitality | 2020 |
| Tanglewood Ventures Limited | Professional & scientific | 2014 |
| Tango Music Productions Limited | Arts & recreation | 2006 |
| Tango Sierra Investments Limited | Real estate | 2022 |