| Sw-Sig Solutions Ltd | Professional & scientific | 2024 |
| SW19 Logistics Ltd | Transport & logistics | 2026 |
| SW8 Associates Limited | Construction | 2011 |
| Swan Family Centres Limited | Health & social care | 2019 |
| Swanley Brothers Ltd | Wholesale & retail | 2018 |
| Swanley New Barn Railway Limited | Transport & logistics | 2003 |
| Swanscombe Muslim Asso Ltd | Other services | 2026 |
| Swansecombe Drycleaners Ltd | Other services | 2022 |
| Swanstaff Ltd | Administrative & support | 2023 |
| Swati Interior Limited | Wholesale & retail | 2023 |
| SWB & JP Holdings Limited | Financial services | 2026 |
| SWC Developments Ltd | Financial services | 2024 |
| Sweeps & Burners Limited | Administrative & support | 2015 |
| Sweet Jordana Bakery Limited | Hospitality | 2018 |
| Sweet Statements Limited | Wholesale & retail | 2020 |
| Sweetz for Lyfe Ltd | Manufacturing | 2025 |
| Swift Foods and Supplies UK Limited | Wholesale & retail | 2024 |
| Swift Lift Services (Maintenance) Ltd | Administrative & support | 1997 |
| Swift Lift Services Limited | Other services | 1994 |
| Swift Roofing Contractors Limited | Construction | 2018 |
| Swift Roofing Contracts Limited | Construction | 1995 |
| Swiftcleaningcrew Ltd | Administrative & support | 2024 |
| Swiftsam Ltd | Information & communication | 2015 |
| Swiftserve Solutions Limited | Hospitality | 2025 |
| Switch on Electrics Ltd | Construction | 2025 |
| Switched on Solutions Ltd | Construction | 2017 |
| SWL (UK) Limited | Real estate | 2008 |
| SWM Consulting Limited | Administrative & support | 2016 |
| SWW Wickens Limited | Manufacturing | 2019 |
| Swytch Smart Limited | Construction | 2018 |
| Sxemedia Ltd | Manufacturing | 2025 |
| Sydney Mayfair Estates LLP | | 2013 |
| Symbolly Limited | Health & social care | 2020 |
| Symfos Limited | Information & communication | 2017 |
| Symmetry Logistics Holdings Limited | Professional & scientific | 2013 |
| Symmetry Logistics Limited | Professional & scientific | 2013 |
| Synchron Consultants Ltd | Professional & scientific | 2013 |
| Synergy Integrated Solutions Limited | Construction | 2019 |
| Synergy Medical Services Limited | Health & social care | 2016 |
| Synergy Networxx Limited | Information & communication | 2012 |
| Synetech Solutions Ltd | Information & communication | 2018 |
| Synterium Ltd | Information & communication | 2025 |
| Syvs Innovations Ltd | Financial services | 2023 |
| T & B Investments Limited | Professional & scientific | 1985 |
| T & D Transport Limited | Transport & logistics | 2010 |
| T & M Phillips and Sons Ltd | Construction | 2021 |
| T & P Synergy Limited | Real estate | 2012 |
| T & S Engineering Services Limited | Manufacturing | 2001 |
| T Allen Construction Ltd | Construction | 2014 |
| T and AJ Holdings Limited | Hospitality | 2025 |
| T and Y Ventures Limited | Wholesale & retail | 2016 |
| T F Fabrication & Welding Limited | Construction | 2005 |
| T Gurra Ltd | Construction | 2026 |
| T Kebabs Ltd | Hospitality | 2023 |
| T King & Co Limited | Professional & scientific | 2001 |
| T L Drainage Ltd | Water & waste | 2025 |
| T Media Ltd | Manufacturing | 2012 |
| T R M Meats Limited | Wholesale & retail | 2019 |
| T Trivett & Sons Limited | Construction | 2007 |
| T W Drainage Ltd | Administrative & support | 2010 |
| T&B Dental Group Limited | Health & social care | 2026 |
| T&H Partners Limited | Real estate | 2025 |
| T&K Residential Ltd | Households | 2023 |
| T&Mp Properties Limited | Real estate | 2020 |
| T&S Accident Repair Ltd | Wholesale & retail | 2025 |
| T&T Fryer Limited | Hospitality | 2025 |
| T-3 Fashion Limited | Manufacturing | 2017 |
| T-Zero Communications Limited | Information & communication | 2006 |
| T.F.I. (Concepts) Limited | Administrative & support | 1993 |
| T.J.D. Models Limited | Wholesale & retail | 2004 |
| T.S. Drylining Ltd | Construction | 2018 |
| T.T.Thumb Engineering and Construction Limited | Construction | 2016 |
| T2 Health & Safety Consulting Limited | Professional & scientific | 2025 |
| T5 Consultants Limited | Information & communication | 2005 |
| T6 Fashion Limited | Wholesale & retail | 2024 |
| T7CAPITAL Ltd | Financial services | 2026 |
| TA & ST Ltd | Other services | 2018 |
| Taarg Ltd | Professional & scientific | 2014 |
| Taattvva Ltd | Information & communication | 2021 |
| Tachyonx Ltd | Information & communication | 2008 |
| Tacty Consultancy Ltd. | Information & communication | 2014 |
| Tadshopp Ltd | Wholesale & retail | 2020 |
| Tailormade Catering and Hospitality Ltd | Hospitality | 2024 |
| Taimercy Medical Consulting UK Limited | Health & social care | 2022 |
| Taimercyuk Limited | Real estate | 2020 |
| Taiwev Properties Ltd | Real estate | 2026 |
| Tajus Transport Ltd | Transport & logistics | 2025 |
| Takani Prime Realty Ltd | Households | 2025 |
| Talent State (UK) Ltd | Real estate | 2019 |
| Talenttrade Recruitment Limited | Administrative & support | 2024 |
| Talking Heads Macro Ltd | Administrative & support | 2016 |
| Talking Pictures TV Encore Limited | Information & communication | 2021 |
| Talking Pictures TV Limited | Information & communication | 2014 |
| Tallhills Ltd | Information & communication | 2024 |
| Tallonwood Developments Limited | Real estate | 1986 |
| TAM & Josh Associates Limited | Mining & quarrying | 2025 |
| Tamarin Red Ltd | Wholesale & retail | 2024 |
| Tamgra Care UK Ltd | Health & social care | 2025 |
| Tami and Dami Consulting Ltd | Real estate | 2014 |
| Tamplin Ltd | Manufacturing | 2019 |