| Supreme Products Ltd | Construction | 2000 |
| Supreme UK Education Limited | Education | 2018 |
| Supres Ltd | Wholesale & retail | 2026 |
| Surbiton OP Co Limited | Real estate | 2026 |
| Surbiton Top Co Limited | Real estate | 2026 |
| Sure Building & Construction Ltd | Construction | 2017 |
| Sure Building and Construction SBC Ltd | Construction | 2026 |
| Sure Health Systems Ltd | Wholesale & retail | 2019 |
| Sure London Ltd | Construction | 2018 |
| Sure Serve UK Ltd | Construction | 2008 |
| Sure Start ABA Limited | Education | 2021 |
| Sure Start Fostering Agency Limited | Health & social care | 2018 |
| Sure Watch Limited | Administrative & support | 2025 |
| Surge Healthcare Ltd | Health & social care | 2018 |
| Surkhabdeep Singh Ltd | Construction | 2025 |
| Surlux Medical Imaging Solutions Limited | Health & social care | 2014 |
| Surmas Valley Ltd | Real estate | 2024 |
| Surrey Grill Limited | Hospitality | 2018 |
| Surrey Hills Consulting Ltd. | Information & communication | 2014 |
| Surrey Premium Car Rentals Ltd | Wholesale & retail | 2024 |
| Surrey Steel Holdings Limited | Financial services | 2021 |
| Surrey’S Learning & Counselling Centre Ltd | Education | 2020 |
| Surveying Corp Ltd | Real estate | 2023 |
| Sushi Boom House Limited | Hospitality | 2023 |
| Sushi Handroll Finsbury Park Limited | Hospitality | 2023 |
| Sushi Handroll Franchisor Limited | Hospitality | 2023 |
| Sushi Handroll Limited | Hospitality | 2018 |
| Sushi Handroll London Limited | Hospitality | 2021 |
| Sushi Handroll South East Ltd | Hospitality | 2023 |
| Sushi Handroll Tooting Ltd | Hospitality | 2025 |
| Sushi Handroll Upminster Ltd | Hospitality | 2026 |
| Sushi Handroll Weybridge Ltd | Hospitality | 2025 |
| Sushi Lovers Limited | Hospitality | 2021 |
| Sushi Station Ltd | Hospitality | 2021 |
| Sushmayash Investments Ltd | Real estate | 2019 |
| Sustaincart Ltd | Wholesale & retail | 2026 |
| Suta Plumbing and Heating Limited | Construction | 2024 |
| Sutherland Insurance Services Limited | Financial services | 1968 |
| Suthernvintagewholesale Ltd | Wholesale & retail | 2025 |
| Suti Autotrader Ltd | Wholesale & retail | 2024 |
| Sutra Catering Ltd | Hospitality | 2025 |
| Sutra Hospitality Ltd | Hospitality | 2024 |
| Suttons 88 Ltd | Hospitality | 2017 |
| Suvaca Technologies Limited | Wholesale & retail | 2022 |
| SV Fruit & VEG Ltd | Wholesale & retail | 2016 |
| SV GAS Solutions Ltd | Construction | 2019 |
| SV Proch Ltd | Construction | 2024 |
| SV Residential Limited | Real estate | 2022 |
| SV Smart Interiors Ltd | Construction | 2026 |
| SV Web Works Ltd | Information & communication | 2025 |
| Svarm Limited | Construction | 2023 |
| SVK Software Ltd | Information & communication | 2018 |
| SVL Construction Company Ltd | Construction | 2025 |
| SVN Trading Ltd | Wholesale & retail | 2023 |
| SW Financial Consultants Ltd | Professional & scientific | 2025 |
| SW Optics Ltd | Professional & scientific | 2023 |
| SW1FTCORE UK Limited | Real estate | 2016 |
| SW1X Limited | Information & communication | 2011 |
| SWA Motors Ltd | Wholesale & retail | 2026 |
| Swaine Services Limited | Arts & recreation | 2016 |
| Swainlands Construction Ltd | Construction | 1995 |
| Swami Softies Limited | Wholesale & retail | 2022 |
| Swan Design International Ltd | Professional & scientific | 2020 |
| Swan Limited | Construction | 2005 |
| Swank and Swagger Ltd | Wholesale & retail | 2019 |
| Swanmore Limited | Hospitality | 2018 |
| Swanny Limited | Wholesale & retail | 2026 |
| Swargo Real Estate Ltd | Households | 2020 |
| SWB Logistic Limited | Transport & logistics | 2019 |
| Sweeney Estates Limited | Real estate | 2006 |
| Sweenvest Properties Limited | Real estate | 2021 |
| Sweets Town Sydenham Ltd | Manufacturing | 2025 |
| SWG Solutions Ltd | Construction | 2018 |
| Swift Card Payments Limited | Administrative & support | 2022 |
| Swift Loop Ltd | Wholesale & retail | 2025 |
| Swift Office Cleaning Services Ltd | Administrative & support | 2002 |
| Swift OH Limited | Health & social care | 2025 |
| Swift Synergies Limited | Professional & scientific | 2017 |
| SWIFT1JOB4U Limited | Administrative & support | 2024 |
| Swiftlux Transport Solutions Ltd | Transport & logistics | 2025 |
| Swiftquote Limited | Financial services | 2006 |
| SWL Infotech Solutions Ltd | Information & communication | 2023 |
| SWL Traders Ltd | Construction | 2024 |
| Swoodfood Limited | Hospitality | 2026 |
| SWS Consultants Ltd | Professional & scientific | 2016 |
| SWS Enterprises Ltd | Wholesale & retail | 2026 |
| SX Flooring Limited | Construction | 2021 |
| SX Property Solutions Ltd | Construction | 2024 |
| SXC Prestige Ltd | Administrative & support | 2021 |
| Sybash Ltd | Wholesale & retail | 2023 |
| Sycamore Consult Limited | Other services | 2011 |
| SYD Health & Beauty Ltd | Wholesale & retail | 2021 |
| SYD Traders Ltd | Wholesale & retail | 2026 |
| Syden Ltd | Information & communication | 2026 |
| Sydenham Mews Limited | Construction | 2021 |
| Syed & Syed Legal Limited | Professional & scientific | 2025 |
| Syed Salt Ltd | Wholesale & retail | 2014 |
| Syed Soilicitors Ltd | Professional & scientific | 2025 |
| SYG Research and Services Limited | Information & communication | 2019 |
| Sygny Limited | Information & communication | 2017 |