| Stephen Lachter Limited | Wholesale & retail | 2013 |
| Stepney Marsh Ltd | Real estate | 2023 |
| Stereo Creative Group Limited | Administrative & support | 2023 |
| Stereo Creative Limited | Administrative & support | 2007 |
| Sterling Oakmont Holdings (R2R) Ltd | Real estate | 2025 |
| Steshkin Limited | Construction | 2019 |
| Steve & Julia's Properties Limited | Real estate | 2016 |
| Stevegarrardltd Limited | Construction | 2016 |
| Steven Cooper Limited | Construction | 2022 |
| Steven Lodge Management Company Limited | Households | 2002 |
| Stevieleah Aesthetics Training Academy Limited | Education | 2025 |
| STF Flooring Limited | Construction | 2023 |
| Still I Rise Therapy (S.I.R.T) Limited | Other services | 2021 |
| Stinogen Logistics Ltd | Transport & logistics | 2025 |
| Stitch Relocations Ltd | Real estate | 2025 |
| STJ & Building Limited | Manufacturing | 2024 |
| STL Corporate Services Ltd | Health & social care | 2017 |
| STL Roofing Limited | Construction | 2022 |
| Stock Brook Developments Limited | Construction | 2021 |
| Stock Brook Manor (Golf Club) Limited | Arts & recreation | 1990 |
| Stockplace Investments Limited | Construction | 2004 |
| Stockplace Management Limited | Real estate | 2021 |
| Stockplace Shoeburyness Limited | Financial services | 2010 |
| Stohomes Ltd | Real estate | 2026 |
| Stone Lane Ltd | Manufacturing | 2023 |
| Stonebond Estates Ltd | Real estate | 2004 |
| Stonebridge Genus Limited | Financial services | 1988 |
| Stonebridge Mortgage Solutions Limited | Financial services | 2005 |
| Stoneface Trading Company Ltd | Wholesale & retail | 2024 |
| Stonegate Property Services Limited | Real estate | 2026 |
| Stoney Scaffolding Ltd | Construction | 2024 |
| Store Maintenance Europe Limited | Administrative & support | 2022 |
| Store Maintenance Limited | Administrative & support | 1990 |
| Storm & Bloom Ltd | Arts & recreation | 2025 |
| Storm (UK) Limited | Other services | 2012 |
| Storm Investment Properties Limited | Real estate | 2022 |
| Stormwaves Care Limited | Health & social care | 2020 |
| STR Cleaning Specialists Ltd | Administrative & support | 2023 |
| Stradavious Limited | Wholesale & retail | 2024 |
| Strategic Debt Services Ltd | Professional & scientific | 2025 |
| Strategic HR Limited | Administrative & support | 2019 |
| Strategic Learning Consultancy Ltd | Education | 2025 |
| Strathearn Estates Group Limited | Real estate | 2022 |
| Street Smart Properties Ltd | Real estate | 2021 |
| Street Wrap and Grill Ltd | Hospitality | 2025 |
| Streetlight Precision Services Ltd | Real estate | 2020 |
| Stresstherapist.Net Limited | Health & social care | 2022 |
| Strickland 7 Limited | Hospitality | 2018 |
| String's HQ Ltd | Other services | 2020 |
| Stripe Luggage Ltd | Extraterritorial | 2023 |
| Stripey Leopard Services Ltd | Professional & scientific | 2015 |
| Structra Scaffold Limited | Construction | 2021 |
| Structured Strategies Limited | Financial services | 2019 |
| Stryce Construction Services Ltd | Construction | 2010 |
| Stuart Axon Limited | Information & communication | 2013 |
| Stuart Tony Johnson Limited | Extraterritorial | 2022 |
| Student Gowns Ltd | Wholesale & retail | 2017 |
| Studio Fourteen 2 Limited | Arts & recreation | 2026 |
| Studio Fourteen Brentwood Limited | Other services | 2025 |
| Studio Fourteen Group Limited | Other services | 2024 |
| Studio LMB Limited | Arts & recreation | 2018 |
| STUDIO11 Media Limited | Professional & scientific | 2025 |
| Stulgai Limited | Transport & logistics | 2023 |
| STW Exterior Cleaning Services Ltd | Administrative & support | 2026 |
| Style Bay Ltd | Wholesale & retail | 2026 |
| Stylecore Ltd | Other services | 2026 |
| Stylish Fencing & Landscaping Ltd | Administrative & support | 2025 |
| SUB Zero Heat Ltd | Energy | 2018 |
| Subline Digital Solutions Limited | Other services | 2023 |
| Success Food Limited | Hospitality | 2018 |
| Successful Ventures Limited | Wholesale & retail | 2018 |
| Successors Consulting Services Ltd | Professional & scientific | 2011 |
| Sudan-Bukra Media Organisation Ltd | Information & communication | 2019 |
| Sudbury Stables Limited | Professional & scientific | 2003 |
| Sudhakar Solutions Ltd | Information & communication | 2013 |
| Sudn Trading Ltd | Water & waste | 2020 |
| Suga Nails & Beauty Ltd | Other services | 2026 |
| Sugar Hill Investment Ltd | Real estate | 2013 |
| Suiqaam Luxe Limited | Real estate | 2025 |
| Sulaco Solutions Limited | Professional & scientific | 2022 |
| SULTAN04 Properties and Services Limited | Real estate | 2020 |
| Sumit Accessories Ltd | Wholesale & retail | 2026 |
| Summerfield Landscapes Ltd | Professional & scientific | 2026 |
| Summerhayes (UK) Limited | Information & communication | 2012 |
| Summit Estate Solutions Limited | Administrative & support | 2024 |
| Summit Outdoors & Leisure PLC | Wholesale & retail | 1997 |
| Summit Render Supplies Essex Limited | Construction | 2024 |
| Summit Render Supplies Limited | Construction | 2021 |
| Summit Scaffold Inspection Services Limited | Construction | 2015 |
| Sumy Trans Ltd | Transport & logistics | 2018 |
| Sun Changing Rooms Limited | Manufacturing | 1992 |
| Sun Power Solutions Ltd | Construction | 2023 |
| Sundance Health & Beauty Limited | Health & social care | 2025 |
| Sundog Limited | Information & communication | 2017 |
| Sunlight Kitchen & Bedroom Ltd | Manufacturing | 2021 |
| Sunlink Energy Ltd | Construction | 2024 |
| Sunningdale Building Services Ltd | Construction | 2020 |
| Sunny.A Services Ltd | Construction | 2014 |
| Sunrise Home Improvements (UK) Limited | Administrative & support | 2009 |
| Sunrise Kusile Kids Limited | Health & social care | 2018 |