| SG Homes & Investments Limited | Real estate | 2021 |
| Sharland Landscaping & Design Limited | Administrative & support | 2022 |
| Shconsulting (UK) Limited | Extraterritorial | 2013 |
| Shee Retreats Ltd | Administrative & support | 2025 |
| Shjb Consulting Ltd | Other services | 2025 |
| Shoe Fits Limited | Wholesale & retail | 2020 |
| Shop at Babington Retail Ltd | Wholesale & retail | 2025 |
| Shopme Limited | Information & communication | 2020 |
| Sibley Holdings Limited | Real estate | 2022 |
| Sidlar Ltd | Real estate | 2023 |
| Silvawood Ltd | Agriculture & fishing | 2014 |
| Silver Street House (Wiltshire) Limited | Households | 1978 |
| Simon Watts Properties Limited | Financial services | 2019 |
| Slade Health UK Limited | Other services | 2024 |
| Slo-Yin Wellness Ltd | Education | 2026 |
| Small Business Fulfilment Services Limited | Transport & logistics | 2009 |
| Small World Associates Ltd | Professional & scientific | 2021 |
| Smart Renovations (Bath) Ltd | Construction | 2015 |
| Smileyminds Coaching Limited | Education | 2026 |
| Social Zebra Limited | Administrative & support | 2019 |
| Sokol Group Ltd | Wholesale & retail | 2026 |
| Somerset Place Residents Management Company Limited | Households | 2012 |
| SOS Computer Solutions Ltd | Wholesale & retail | 2009 |
| Sourced at Home Ltd | Construction | 2022 |
| South West Pristine Cleaning Limited | Administrative & support | 2023 |
| Sovereign Damp and Timber Limited | Construction | 2017 |
| Sparkling Diamonds Cleaning Ltd | Administrative & support | 2019 |
| Special Expeditions (UK) Limited | Administrative & support | 2010 |
| Spencer Smith Limited | Construction | 2008 |
| Spenthorpe Development Ltd | Real estate | 2018 |
| Spenthorpe Limited | Professional & scientific | 2014 |
| SPG Property Limited | Real estate | 2016 |
| SPG Virtual Tours Limited | Real estate | 2021 |
| Spindles Bikes Ltd | Wholesale & retail | 2021 |
| Sportsward Limited | Real estate | 2019 |
| ST David's Prep Limited | Education | 2015 |
| ST Edward's Prep Limited | Education | 2014 |
| ST Faith's at ASH School Limited | Education | 2012 |
| ST John`S Road (Bath) Management Limited | Households | 2009 |
| ST Project Solutions & Consultancy Ltd | Professional & scientific | 2025 |
| ST. Catherines Supplies Ltd. | Agriculture & fishing | 1997 |
| ST. Nicholas House Management (Bath) Limited | Households | 1981 |
| St.Patricks Court(Bath)Limited | Households | 1968 |
| Stafford Practice Ltd | Health & social care | 2020 |
| Stagg Home Improvements Ltd | Construction | 2019 |
| Stanley Adventures Ltd | Hospitality | 2022 |
| Station Road Garage Limited | Wholesale & retail | 2009 |
| Stem Cell VET Ltd | Professional & scientific | 2016 |
| Stephen Hall Financial Planning Ltd | Financial services | 2014 |
| Stephens Industries Ltd | Manufacturing | 1956 |
| Stewart Barnes Associates Limited | Professional & scientific | 2002 |
| Stone Media Marketing Ltd | Professional & scientific | 2021 |
| Stonewood Architecture Limited | Professional & scientific | 2024 |
| Stonewood Design Ltd | Professional & scientific | 2019 |
| Stoneworks of Bath Limited | Manufacturing | 2011 |
| Stow Park Solar Ltd | Construction | 2019 |
| Strawberry Fields Hair Design Limited | Other services | 2009 |
| Streamline Smart Buildings Ltd | Professional & scientific | 2022 |
| Studio Kiri Ltd | Professional & scientific | 2025 |
| Studio LM Lighting Design Ltd | Professional & scientific | 2023 |
| Style & Vision Design in Communication Limited | Arts & recreation | 1989 |
| Succinct Strategy Company Ltd | Professional & scientific | 2024 |
| Supply Chain Solutions Limited | Transport & logistics | 1992 |
| SVK Business Solutions Limited | Professional & scientific | 2020 |
| SW Aluminium Products Limited | Manufacturing | 2024 |
| SW Pristine Cleaning (Corsham Area) Ltd | Administrative & support | 2025 |
| SW Pristine Cleaning (Devizes Area) Ltd | Administrative & support | 2025 |
| Switchstone Holdings Limited | Financial services | 2023 |
| Switchstone Limited | Administrative & support | 2007 |
| Sydney Place Bath (Management) Limited | Households | 1991 |
| T&R Subba Ltd | Real estate | 2024 |
| Taggart Anaesthesia Limited | Health & social care | 2022 |
| Tain Brae Limited | Wholesale & retail | 2011 |
| Tangentrine Limited | Information & communication | 2010 |
| Tanz&Co Ltd | Manufacturing | 2021 |
| Tanzero Enterprises Ltd | Manufacturing | 2024 |
| Tax Law Week Limited | Extraterritorial | 2021 |
| Taylor Made Carpentry & Construction Limited | Construction | 2018 |
| TCF Holdings Ltd | Financial services | 2018 |
| TDT Sports Ltd | Arts & recreation | 2023 |
| Team Breakthrough Limited | Health & social care | 2011 |
| Teamhaven Group Ltd | Information & communication | 2016 |
| Teamhaven Limited | Information & communication | 2007 |
| Tech Genius Ltd | Administrative & support | 2016 |
| Technical Component Consultancy Limited | Professional & scientific | 2012 |
| Telepathy Ltd | Information & communication | 2026 |
| Terrain Mapping Ltd | Professional & scientific | 2014 |
| TFR FM Ltd | Manufacturing | 2019 |
| TFR Holdings Ltd | Financial services | 2022 |
| Thalion Tech Ltd | Professional & scientific | 2025 |
| That People Thing Limited | Information & communication | 2010 |
| THE 13 Cambridge Park Bristol Management Company Limited | Households | 1991 |
| THE Awards Agency Limited | Professional & scientific | 2009 |
| THE Aylmer-Kelly Partnership LLP | | 2016 |
| THE Bike the Body Ltd | Information & communication | 2019 |
| THE Birdhouse Cafe Ltd | Hospitality | 2024 |
| THE Business Exchange South West Limited | Information & communication | 2013 |
| THE Catch Restaurants Limited | Extraterritorial | 2014 |
| THE Corsham Gallery Ltd | Wholesale & retail | 2021 |
| THE Corsham School Academy Group | Education | 2011 |