| Summan International Limited | Manufacturing | 1996 |
| Summit Metrology Limited | Manufacturing | 2006 |
| Summit Nails Ltd | Other services | 2025 |
| Summit Sports Ltd | Wholesale & retail | 2022 |
| Sunblight Ltd | Wholesale & retail | 2019 |
| Sundial Stores Ltd | Real estate | 2012 |
| Sunee Ltd | Real estate | 2025 |
| Sunfern Limited | Real estate | 2026 |
| Sunlord Property Ltd | Real estate | 2020 |
| Sunner Enterprise Ltd | Other services | 2015 |
| Sunnybricks Properties Ltd | Real estate | 2018 |
| Sunnybricks Properties RR Ltd | Real estate | 2024 |
| Sunrise After Loss CIC | Education | 2025 |
| Sunrise Enablement Ltd | Administrative & support | 2021 |
| Supad Tech Ltd | Information & communication | 2022 |
| Supastuds Limited | Administrative & support | 2004 |
| Super Carwash & Valeting Ltd | Administrative & support | 2024 |
| Super High Star Ltd | Administrative & support | 2025 |
| Super High Star One Ltd | Administrative & support | 2026 |
| Super Saving Bargains Ltd | Wholesale & retail | 2020 |
| Superior Group Holdings Limited | Professional & scientific | 2007 |
| Superior Sections Ltd | Manufacturing | 2007 |
| Supreme Care Group Ltd | Construction | 2022 |
| Supreme Hair Studio Ltd | Other services | 2024 |
| Sure Seal Holdings and Investments Ltd | Financial services | 2022 |
| Sure Seal Roofing Ltd | Construction | 2013 |
| Sure Start Homeless Housing Ltd | Real estate | 2020 |
| Sure Start Housing Limited | Real estate | 2022 |
| Suresafe Electrical Limited | Construction | 2016 |
| Suresigns (Kford) Limited | Professional & scientific | 2021 |
| Suretest NDT Services Limited | Professional & scientific | 2011 |
| Surface Processing Solutions Limited | Manufacturing | 2008 |
| Surfwash Ltd | Real estate | 2008 |
| Surprise! You'Re Dead! Music Ltd | Other services | 2013 |
| Survey Plan & Design Ltd | Professional & scientific | 2023 |
| Surveys & Service Ltd | Water & waste | 2025 |
| Suspa UK Limited | Wholesale & retail | 2007 |
| Sustained Growth Ltd | Professional & scientific | 2022 |
| SVL Logistics Ltd | Transport & logistics | 2025 |
| Swain Holdings and Investments Ltd | Financial services | 2021 |
| Swan Bar and Grill Limited | Hospitality | 2023 |
| Swan Bars Ltd | Hospitality | 2025 |
| Swan Island Hotels Limited | Hospitality | 2008 |
| Swan Valeting Centre Ltd | Other services | 2016 |
| Swatches Limited | Manufacturing | 2019 |
| Sweetness & Bounty Limited | Wholesale & retail | 2017 |
| SWG Transport Ltd | Transport & logistics | 2023 |
| Swge Holdings Limited | Professional & scientific | 2023 |
| Swift Builders Merchant Ltd | Wholesale & retail | 2026 |
| Swift Precision Grinding Services Limited | Extraterritorial | 2019 |
| Swiftsys Holdings and Investments Ltd | Financial services | 2023 |
| Swiftwing Travels Ltd | Hospitality | 2025 |
| Swinscoe Holdings Ltd | Financial services | 2023 |
| Swinscoe Investments Ltd | Real estate | 2026 |
| Swinscoe Property Ltd | Real estate | 2023 |
| Swiss House Care Home Limited | Health & social care | 2014 |
| Switch on Connections Limited | Construction | 2023 |
| Switch on Holdings Ltd | Financial services | 2024 |
| Switch on Ltd | Construction | 2017 |
| Switchguard Advisory Ltd | Information & communication | 2026 |
| SWN Y Deryn Properties Ltd | Real estate | 2015 |
| Syan Care Group Limited | Financial services | 2024 |
| Syan Group Limited | Financial services | 2022 |
| Sybex Designs Limited | Information & communication | 2025 |
| SYD Services Ltd | Administrative & support | 2016 |
| Symech (Electrical Services) Ltd | Manufacturing | 2012 |
| Synergy Dance Training Academy Limited | Arts & recreation | 2020 |
| Sypher Security Ltd | Administrative & support | 2023 |
| Sysserv Technology Limited | Information & communication | 2009 |
| Szympol Ltd | Transport & logistics | 2022 |
| T & a Private Ltd | Real estate | 2025 |
| T & G Holdings and Investments Ltd | Financial services | 2024 |
| T & G Investment Properties Ltd | Real estate | 2024 |
| T & G Sales Ltd | Wholesale & retail | 2019 |
| T & L Designs Limited | Construction | 2012 |
| T & S Investments Limited | Real estate | 1999 |
| T & T Travels Limited | Transport & logistics | 2016 |
| T a H Maintenance Ltd | Construction | 2022 |
| T a Utilities Ltd | Construction | 2024 |
| T C D Plastering Limited | Construction | 2022 |
| T Cartwright Builders Limited | Construction | 2017 |
| T Cartwright Holdings Ltd | Financial services | 2024 |
| T D Management Services Ltd | Other services | 2017 |
| T J Turner & SON Limited | Water & waste | 2006 |
| T K Asset Management Limited | Administrative & support | 2003 |
| T S Russell Ltd | Wholesale & retail | 2023 |
| T&D Holdings (Midlands) Ltd | Financial services | 2023 |
| T&D Innovations Ltd | Professional & scientific | 2024 |
| T&D Property (Midlands) Ltd | Real estate | 2023 |
| T&J Realty Limited | Real estate | 2023 |
| T. a. D. Electrical Limited | Construction | 2006 |
| T. J. Moore Transport Limited | Transport & logistics | 2002 |
| T.C.Morris Limited | Manufacturing | 1956 |
| T.K. Finance Limited | Real estate | 1981 |
| T.P. Pools Services Limited | Construction | 1986 |
| T.R. Property Developments Limited | Real estate | 2004 |
| T.R.K. Management Limited | Real estate | 2004 |
| T5 Media Limited | Information & communication | 2022 |
| TA Machine Services Limited | Manufacturing | 2020 |
| TAB Design & Build Ltd | Construction | 2025 |