| Sweethub Ltd | Wholesale & retail | 2019 |
| Sweetopia Ltd | Manufacturing | 2024 |
| Sweets & More Limited | Wholesale & retail | 2018 |
| Sweets Plus Ltd | Wholesale & retail | 2023 |
| Swetes Limited | Real estate | 2025 |
| SWH Leisurehall Limited | Arts & recreation | 2007 |
| Swift Action Services Limited | Administrative & support | 2019 |
| Swift Autocare Ltd | Wholesale & retail | 2023 |
| Swift Cargo Solutions UK Ltd | Transport & logistics | 2024 |
| Swift Catalyst Ltd | Information & communication | 2026 |
| Swift Drop Services Ltd | Transport & logistics | 2025 |
| Swift Employment Services Limited | Administrative & support | 2024 |
| Swift Holdings 23 Limited | Financial services | 2024 |
| Swift Response Security Limited | Administrative & support | 2026 |
| Swift Sales and Lettings Limited | Real estate | 2018 |
| Swift Wave Solutions Ltd | Administrative & support | 2020 |
| Swiftbay UK Ltd | Wholesale & retail | 2025 |
| Swiftcard Ltd | Wholesale & retail | 2025 |
| Swiftex Ltd | Professional & scientific | 2024 |
| Swiftmedi Ltd | Health & social care | 2024 |
| Swiftroute Ltd | Transport & logistics | 2026 |
| Swiftroute Services Ltd | Transport & logistics | 2025 |
| Swiftsell Marketplace Ltd | Wholesale & retail | 2025 |
| Swiftshield Decontamination Ltd | Administrative & support | 2025 |
| Swiftx Delivery Limited | Transport & logistics | 2025 |
| Swifty Suppliers Ltd | Wholesale & retail | 2025 |
| Swim Speci LLP | | 2021 |
| Swim Splash Learn Ltd | Arts & recreation | 2023 |
| Swiss Couriers Limited | Transport & logistics | 2025 |
| Switch Energy Properties Ltd | Real estate | 2023 |
| Switchgear & Instrumentation Limited | Manufacturing | 2011 |
| SWR Jewellery Limited | Wholesale & retail | 2025 |
| SWW Ventures Limited | Wholesale & retail | 2006 |
| SY Welding & Fabrication Ltd | Manufacturing | 2025 |
| Sybi Leeds RD Ltd | Hospitality | 2025 |
| Sycamore Inns Limited | Hospitality | 2022 |
| Sycamore Lawn Care Limited | Administrative & support | 2021 |
| Sydney Goldwyn (Shipley) Ltd | Health & social care | 2019 |
| Sydwell International Ltd | Wholesale & retail | 2017 |
| Syed Enterprises Ltd | Manufacturing | 2025 |
| Syeda Amina Trust | Information & communication | 2012 |
| Sygma Cars Ltd | Administrative & support | 2024 |
| Sygma Healthcare (UK) Ltd | Health & social care | 2022 |
| Sygma Healthcare Ltd | Health & social care | 2021 |
| Sygma Vehicles Ltd | Administrative & support | 2025 |
| Sykes Housing Ltd | Hospitality | 2019 |
| Sylhet Bazar BD Ltd | Wholesale & retail | 2023 |
| Sylhet Kitchen Limited | Hospitality | 2024 |
| Sylvester Aimufua Ltd | Other services | 2018 |
| Syma Properties Ltd | Real estate | 2018 |
| Symbian Technology Ltd | Other services | 2018 |
| Symbioserve UK Ltd | Information & communication | 2018 |
| Symposium Secret Garden Limited | Hospitality | 2024 |
| Synagogue City Limited | Other services | 2023 |
| Sync Incorporated Limited | Other services | 2017 |
| Sync Inn Digital Limited | Wholesale & retail | 2024 |
| Syncelite Limited | Wholesale & retail | 2024 |
| Syncwave Services Ltd | Information & communication | 2025 |
| Syndicate Emporium Ltd | Wholesale & retail | 2025 |
| Synergi Training Ltd | Professional & scientific | 2008 |
| Synergy Consulting Services Ltd | Information & communication | 2024 |
| Synergy Homes North Ltd | Real estate | 2024 |
| Synergy SMC Ltd | Wholesale & retail | 2024 |
| Synergynex IT Consulting Ltd | Information & communication | 2026 |
| Synervate Limited | Wholesale & retail | 2025 |
| Syno-Vital Ltd | Administrative & support | 2007 |
| Syntek Electronics Ltd | Wholesale & retail | 2026 |
| Syntek Solutions Ltd | Wholesale & retail | 2026 |
| Synthesis Display Ltd | Construction | 2018 |
| Syntof Ltd | Wholesale & retail | 2021 |
| Syntratech Consulting Ltd | Professional & scientific | 2025 |
| Syntrix Solutions Ltd | Wholesale & retail | 2026 |
| Syrian Association of Yorkshire | Real estate | 2014 |
| Syrian Garage Ltd | Manufacturing | 2022 |
| Systemloom Limited | Information & communication | 2025 |
| SZ 786 Properties Ltd | Real estate | 2026 |
| SZ Beds Ltd | Manufacturing | 2025 |
| SZ Capital Ltd | Wholesale & retail | 2023 |
| SZ Compliance Consulting Ltd | Administrative & support | 2017 |
| SZ Invest Limited | Real estate | 2020 |
| SZ Oceancrest Limited | Extraterritorial | 2026 |
| SZ Painting & Decorating Ltd | Construction | 2017 |
| SZA Holdings Ltd | Real estate | 2020 |
| Szegaian Ltd | Wholesale & retail | 2021 |
| SZH Healthcare Ltd | Health & social care | 2020 |
| T & G Installations Ltd | Construction | 2019 |
| T & H Consultancy Limited | Professional & scientific | 2020 |
| T & M Joinery Services Ltd | Construction | 2023 |
| T & N Real Esates Ltd | Real estate | 2025 |
| T & P Print Limited | Manufacturing | 2015 |
| T & QS Grand Desserts Ltd | Manufacturing | 2023 |
| T & S Group Limited | Administrative & support | 2017 |
| T & S Robinson Limited | Wholesale & retail | 2003 |
| T & S Robinson Partners LLP | | 2012 |
| T & S Robinson Partnership LLP | | 2012 |
| T & T (Yorkshire) Ltd | Health & social care | 2007 |
| T Cuts Ltd | Other services | 2019 |
| T D Valeting Ltd | Administrative & support | 2023 |
| T Dawson Consulting Ltd | Professional & scientific | 2003 |
| T H Healthcare Services Limited | Health & social care | 2021 |