| Supportive Ability Living Limited | Health & social care | 2024 |
| Sure Strategies Ltd | Information & communication | 2025 |
| Sure-Set Golf Limited | Wholesale & retail | 2014 |
| Surface Surgery Limited | Professional & scientific | 2016 |
| Surfaceprint Solutions Ltd | Manufacturing | 2026 |
| Surgam International Ltd | Professional & scientific | 2023 |
| Surgical Skin Limited | Health & social care | 2022 |
| Sushila Sushi Limited | Hospitality | 2024 |
| Sustainable Agricultural Systems Limited | Manufacturing | 2012 |
| Sustainable Eco Plastics Ltd | Water & waste | 2023 |
| Sustainable Heating Solutions Limited | Construction | 2023 |
| Sustainable House Ltd | Real estate | 2022 |
| Sustainable Wood Energy Ltd | Manufacturing | 2011 |
| Sutton Software Ltd | Information & communication | 2025 |
| Suzette Street Holdings Limited | Real estate | 2020 |
| Suzette Street Limited | Real estate | 2020 |
| SVS Dynamics Limited | Information & communication | 2024 |
| SW Audit Solutions Ltd | Professional & scientific | 2024 |
| SW1 Group Ltd | Other services | 2019 |
| Swain & Rands Limited | Construction | 2012 |
| Swallowfield Consulting Limited | Information & communication | 2022 |
| Swanwey Limited | Hospitality | 2009 |
| Swanwood Productions Limited | Information & communication | 2012 |
| Sweet AS Sauces Ltd | Manufacturing | 2019 |
| Sweet OIL Services Limited | Professional & scientific | 2014 |
| Swervy Ltd | Professional & scientific | 2026 |
| Swift Agility Limited | Information & communication | 2020 |
| Swiftwing Ltd | Transport & logistics | 2023 |
| Swineham Ltd | Hospitality | 2024 |
| Swiss Insulation Ltd | Construction | 2018 |
| Switch Case Limited | Information & communication | 2023 |
| Swrac Holdings Ltd | Financial services | 2024 |
| SXP7 Consulting Limited | Financial services | 2015 |
| Sydara Solutions Ltd | Information & communication | 2025 |
| Syldavia Ltd | Information & communication | 2022 |
| Synapsis Software Limited | Information & communication | 2018 |
| Synergy Build & Renewables Ltd | Construction | 2022 |
| Syntera Limited | Professional & scientific | 2025 |
| Synthesis Analytics Limited | Information & communication | 2024 |
| Synthesizedesign Limited | Information & communication | 2016 |
| Syscorp Limited | Information & communication | 2015 |
| Sysguard Ltd | Information & communication | 2019 |
| Szkoda Consulting Ltd | Information & communication | 2022 |
| T & K Electricals Ltd | Construction | 2014 |
| T & K Mechanical Ltd | Construction | 2020 |
| T & K Property Ltd | Real estate | 2017 |
| T & K Services Group Ltd | Financial services | 2020 |
| T C O F Ltd | Wholesale & retail | 2014 |
| T Contracting Limited | Information & communication | 2019 |
| T Farrell Consultancy Limited | Information & communication | 2023 |
| T J Buckfield Ltd | Construction | 2000 |
| T Lewisham Limited | Transport & logistics | 1998 |
| T&S Lettings Limited | Real estate | 2018 |
| T. Johnson (Woolsbridge) Ltd. | Wholesale & retail | 2007 |
| T.A.R Plumbing and Heating Ltd | Construction | 2020 |
| T.C.P. Clearview Limited | Professional & scientific | 2021 |
| T.C.P. Parity Limited | Hospitality | 2019 |
| T.R. Harding (Holdings) Limited | Professional & scientific | 1979 |
| T.R. Harding Limited | Agriculture & fishing | 1979 |
| T.X. Installations Limited | Manufacturing | 1998 |
| T13 Property Limited | Real estate | 2020 |
| T3S Solutions Ltd | Information & communication | 2018 |
| TA Cleaning Services Dorset Ltd | Administrative & support | 2022 |
| Tacenda Limited | Information & communication | 2015 |
| Tacklers Consulting Group Limited | Professional & scientific | 2024 |
| Tailored Planning Solutions Limited | Wholesale & retail | 2019 |
| TAJ Restaurants Ltd. | Hospitality | 2001 |
| Take Markets Ltd | Information & communication | 2022 |
| Take OFF Communications Limited | Professional & scientific | 2025 |
| Takt Productions Ltd | Information & communication | 2019 |
| Talentbridge Network Ltd | Information & communication | 2026 |
| Talieisin Ltd | Information & communication | 2021 |
| Talisman Consulting Limited | Information & communication | 2026 |
| Talisman Investment Ventures Ltd | Real estate | 2024 |
| Tall Order Creative Limited | Professional & scientific | 2015 |
| Tallgray Ltd | Information & communication | 2026 |
| Tally Shell Ltd | Real estate | 2026 |
| Tamasha Solutions Ltd. | Professional & scientific | 2017 |
| Tami Douch Ltd | Professional & scientific | 2025 |
| Tanaka Consulting Ltd | Professional & scientific | 2023 |
| Tarbytots Childcare Limited | Health & social care | 2026 |
| Tarentella Ltd | Professional & scientific | 2016 |
| Target Sales Consultancy Limited | Administrative & support | 2008 |
| Tashi Structures Ltd | Construction | 2020 |
| Taskforce OS Limited | Information & communication | 2025 |
| Tasman Properties Limited | Construction | 2013 |
| Taste Vending Limited | Hospitality | 2013 |
| Taxevo Limited | Professional & scientific | 2018 |
| Tayfield Consulting Limited | Professional & scientific | 2023 |
| Taylor Enterprise Holdings Ltd | Financial services | 2024 |
| Taylor Flemming Property Developments Limited | Construction | 2020 |
| Taylor Project Consulting Ltd | Professional & scientific | 2017 |
| Taylor Reynolds Ltd | Financial services | 2024 |
| Taylored PMO Ltd | Administrative & support | 2022 |
| TB Engineering Services Ltd | Professional & scientific | 2026 |
| TB Support Solutions Limited | Information & communication | 2026 |
| TBR Tuning and Wheels Ltd | Wholesale & retail | 2025 |
| TC Energy Finance Limited | Professional & scientific | 2019 |
| TCE Consultants Limited | Information & communication | 2017 |
| Tcnr Limited | Wholesale & retail | 2019 |