| Stock Property Services Limited | Construction | 2019 |
| Stocklin Limited | Construction | 1993 |
| Stoic Performance Ltd | Administrative & support | 2024 |
| Stonegate (UK) Limited | Real estate | 2008 |
| Stonework Placements Limited | Administrative & support | 2012 |
| Stop N Go Express Ltd | Administrative & support | 2023 |
| Strams Consult Limited | Professional & scientific | 2017 |
| Strategic Business Change Solutions Ltd | Information & communication | 2014 |
| Strategic Business Development International Consulting Network Ukeig | | 1998 |
| Strategic Solutions (IT) Limited | Information & communication | 2016 |
| Stratoworks Ltd | Information & communication | 2019 |
| Stray (LDN) Limited | Information & communication | 2023 |
| Streac-Iii Limited | Education | 2023 |
| Stream First Limited | Information & communication | 2019 |
| Stript Aesthetics Clinic Limited | Other services | 2025 |
| Strong Construction Solutions Limited | Construction | 2026 |
| Strong Exterior Clean Ltd | Administrative & support | 2022 |
| STS Flooring Distributors Limited | Wholesale & retail | 1996 |
| STS Flooring Investments Limited | Extraterritorial | 2023 |
| Stuart Living Ltd | Wholesale & retail | 2023 |
| Studart Podiatry Limited | Health & social care | 2003 |
| Studio HHW Limited | Professional & scientific | 2021 |
| Studio Ninety Five Ltd | Arts & recreation | 2023 |
| Studio Tink Ltd | Other services | 2024 |
| Sturstons Ltd | Construction | 2020 |
| STY Orpington Limited | Other services | 2019 |
| Stylorouge Limited | Extraterritorial | 2022 |
| SU Thai Massage & Beauty Ltd | Other services | 2026 |
| SUB VIP Limited | Other services | 2025 |
| Subavis Consulting Ltd | Health & social care | 2020 |
| Sublime Creations Ltd | Real estate | 2022 |
| Subow Ltd | Health & social care | 2012 |
| Subsea Cable Connections Limited | Professional & scientific | 2017 |
| Succedo Holdings Ltd | Real estate | 2024 |
| Successful Mums London C.I.C. | Education | 2015 |
| Successful Mums Ltd | Administrative & support | 2013 |
| SUE Greetham Photography Limited | Professional & scientific | 2013 |
| SUE Gregory Education Limited | Education | 2013 |
| Suela Hamzi Ltd | Hospitality | 2023 |
| Sufi Kebab Place Ltd | Hospitality | 2020 |
| Sugar’S Bistro Ltd | Hospitality | 2026 |
| Sulexossy Limited | Professional & scientific | 2015 |
| Sullivan & White Ltd | Construction | 2015 |
| Sumaya Pereira DE Araujo Antunes Ltd | Health & social care | 2021 |
| Sumjing Ltd | Hospitality | 2021 |
| Summerdown Consulting Limited | Professional & scientific | 2017 |
| Summerkelv Limited | Real estate | 2013 |
| Summerlands Lodge (Phase 2) RTM Company Limited | Households | 2004 |
| Summit Retail Display Limited | Manufacturing | 1990 |
| Sumner Building Services Limited | Construction | 2022 |
| Sumtise Ltd | Information & communication | 2025 |
| Sun DO (Petts Wood) Limited | Hospitality | 2022 |
| Sun Moon Lake Catering Ltd | Hospitality | 2023 |
| Sun Saturn Consulting Ltd | Information & communication | 2025 |
| Sunclean Services Ltd | Administrative & support | 2019 |
| Sundridge Park Commercial Limited | Real estate | 2021 |
| Sundridge Park Investments Limited | Real estate | 2015 |
| Sundridge Park Lettings Limited | Real estate | 2022 |
| Sundridge Park Properties Limited | Real estate | 2019 |
| Sunion Health Holloway Ltd | Health & social care | 2026 |
| Sunland Properties Ltd | Real estate | 2023 |
| Sunny Barbers (Sevenoaks) Limited | Other services | 2024 |
| Sunnyrose Logistics Limited | Transport & logistics | 2025 |
| Sunrise International Services Ltd | Information & communication | 2009 |
| Sunriver Associates Limited | Financial services | 2006 |
| Sunriver Investments Limited | Real estate | 2020 |
| Sunshine Agencies Limited | Wholesale & retail | 2011 |
| Sunshine Playhouse Limited | Education | 2021 |
| Sunshine Property Maintenance Limited | Construction | 2011 |
| Supa Star Pro Ltd | Construction | 2024 |
| Super Recognisers International Ltd | Professional & scientific | 2016 |
| Super Recognisers Limited | Administrative & support | 2015 |
| Superblue Limited | Real estate | 2024 |
| Supersun CIC | Education | 2024 |
| Supertharrm Globals (UK) Ltd | Professional & scientific | 2024 |
| Supreme Heating and Air Conditioning Ltd | Construction | 2019 |
| Supreme Salon Management Ltd | Administrative & support | 2022 |
| Suraa Ltd | Hospitality | 2025 |
| Surecall Telecoms (UK) Limited | Information & communication | 2015 |
| Sureshashi - Rehab Services Ltd | Health & social care | 2021 |
| Suri Consultancy Services Ltd | Information & communication | 2020 |
| Surveying + Estimating Limited | Professional & scientific | 2008 |
| Surya Media Services Ltd | Professional & scientific | 2025 |
| Susies Rooms Ltd | Real estate | 2001 |
| Sustinaflexpack Limited | Administrative & support | 2024 |
| Sutton Orchard Management Limited | Real estate | 2022 |
| Suvarnasoft Limited | Information & communication | 2011 |
| Suzy 'Kitchen Ltd | Hospitality | 2024 |
| SV Doctors Ltd | Health & social care | 2013 |
| Svgo Ltd | Construction | 2020 |
| Svis Trading Ltd | Extraterritorial | 2010 |
| Svkd Ltd | Construction | 2015 |
| Svmk Group Limited | Professional & scientific | 2026 |
| Svmk Holdings Ltd | Wholesale & retail | 2026 |
| SVP Electronics Limited | Wholesale & retail | 2026 |
| Swaad & Beyond Limited | Wholesale & retail | 2026 |
| Swades Properties Ltd | Real estate | 2021 |
| Swallow Court Residents Society Limited | Households | 1991 |
| Swan Campden Hill Limited | Construction | 2015 |
| Swan Plumbing & Heating Ltd | Construction | 2011 |