| Stock Enterprises Limited | Wholesale & retail | 2026 |
| Stock Horizon Ltd | Financial services | 2025 |
| Stockbox Holdings PLC | Financial services | 2026 |
| Stockbox Ltd | Wholesale & retail | 2026 |
| Stockbox Services Ltd | Wholesale & retail | 2026 |
| Stockbox Technology Ltd | Wholesale & retail | 2026 |
| Stockenstem Limited | Transport & logistics | 2024 |
| Stoic AI Ltd | Information & communication | 2024 |
| Stoik United Trade Ltd | Wholesale & retail | 2022 |
| Stoke Green Properties Limited | Real estate | 2010 |
| Stone & Lace Limited | Wholesale & retail | 2025 |
| Stone Anchor Holdings Ltd | Real estate | 2026 |
| Stone Marble and Tiling Ltd | Construction | 2025 |
| Stone Plumbing & Bathrooms Ltd | Construction | 2023 |
| Stonebridge Boxing Club | Arts & recreation | 2009 |
| Stonehold Group Ltd | Financial services | 2025 |
| Stonehouse Recruitment Group Limited | Administrative & support | 2021 |
| Stonelabs London Ltd | Wholesale & retail | 2025 |
| Stones Corporation Ltd | Wholesale & retail | 2021 |
| Stoneshellproperties Ltd | Real estate | 2025 |
| Stonetown Property Ltd | Real estate | 2021 |
| Stop & Shop Convenient Store Ltd | Hospitality | 2018 |
| Stopsley (2024) Ltd | Wholesale & retail | 2024 |
| Storezen Limited | Manufacturing | 2024 |
| Storm Renewable Energy Services Ltd | | 2011 |
| Strandway Management Ltd | Real estate | 2023 |
| Strategic Discourse Ltd | Professional & scientific | 2014 |
| Strategic Media Centre Ltd | Professional & scientific | 2024 |
| Stratus Cloud Consultancy Limited | Information & communication | 2023 |
| Strawberry Hill Clinic Ltd | Real estate | 2024 |
| Strawberry Hill Limited | Hospitality | 2004 |
| Strax Capital Legal Ltd | Professional & scientific | 2014 |
| Strax Capital Limited | Financial services | 2010 |
| Stream Skills Advancement Ltd | Administrative & support | 2011 |
| Streetform ENG Limited | Construction | 2025 |
| Strength&Spices Herbal Supplements Ltd | Manufacturing | 2025 |
| Strength&Spices Limited | Manufacturing | 2019 |
| Stride One Ltd | Agriculture & fishing | 2024 |
| Strike City Ltd | Arts & recreation | 2018 |
| Strikezinthemix Studios Ltd | Information & communication | 2026 |
| Striving for Independence Care Limited | Health & social care | 2013 |
| Strongfield Consultants Ltd | Professional & scientific | 2000 |
| Strongfield Technologies (Projects) Limited | Professional & scientific | 2000 |
| Strongfield Technologies Consultants Ltd | Professional & scientific | 2000 |
| Strongfield Technologies Limited | Other services | 1994 |
| Structus Investments Limited | Real estate | 2021 |
| Studio 136 Property Management Ltd | Real estate | 2023 |
| Studio 6 (London) Ltd | Arts & recreation | 2024 |
| Studio 61 Limited | Construction | 2005 |
| Studio EOS Holdings Ltd | Wholesale & retail | 2026 |
| Studio Linguini Ltd | Arts & recreation | 2023 |
| Studio N4 Ltd | Other services | 2022 |
| Studio Sessions London Ltd | Arts & recreation | 2025 |
| STUDIO58 Production Ltd | Information & communication | 2025 |
| Sturdy Solutions Ltd | Wholesale & retail | 2022 |
| Stylespectrum Studio Ltd | Wholesale & retail | 2025 |
| Stylish Hair LAB Ltd | Other services | 2022 |
| Stylo World Ltd | Wholesale & retail | 2018 |
| SU4M Limited | Other services | 2017 |
| Sual Ltd | Arts & recreation | 2015 |
| SUB Zero Architecture Limited | Professional & scientific | 2009 |
| Subh Property Ltd | Real estate | 2025 |
| Subka Ltd | Information & communication | 2026 |
| Sublivita Ltd | Manufacturing | 2025 |
| Subra Foods Limited | Wholesale & retail | 2021 |
| Subsol Projects Limited | Construction | 2016 |
| Subzero Capital Limited | Real estate | 2021 |
| Sudbury Building Bathroom Supplies Ltd | Wholesale & retail | 2025 |
| Sudbury Coffee Shop Ltd | Hospitality | 2024 |
| Sudbury DRY Cleaners London Ltd | Other services | 2015 |
| Suez Canal Express Cargo Limited | Transport & logistics | 2016 |
| Suger Properties Ltd | Real estate | 2023 |
| Suit International Ltd | Wholesale & retail | 2023 |
| Sujco Ltd | Health & social care | 2021 |
| Suji Tailoring Ltd | Manufacturing | 2026 |
| Suke-I Limited | Other services | 2014 |
| Sukhi Studios Limited | Arts & recreation | 2026 |
| Sukhi Wellness Studio Limited | Other services | 2026 |
| Sulm Luxe Ltd | Wholesale & retail | 2025 |
| Sultan ALI Property Services Limited | Construction | 2025 |
| Sumi's Choice Limited | Wholesale & retail | 2025 |
| Summer Rosas Vibes Ltd | Wholesale & retail | 2026 |
| Summit Construction London Ltd | Construction | 2025 |
| Summit Furniture International Co., Limited | Wholesale & retail | 2020 |
| Sumo Transport Ltd | Transport & logistics | 2026 |
| Sun Tyres Ltd | Wholesale & retail | 2021 |
| Sunbee Investment Ltd | Households | 2023 |
| Sundew Property Management Limited | Households | 1981 |
| Sundha Construction and Cleaning Limited | Construction | 2024 |
| Sundry Recruitment Limited | Administrative & support | 2017 |
| Sunflower Union London Ltd | Other services | 2017 |
| Sunfree Energy UK Ltd | Construction | 2022 |
| Sunjet Holidays Limited | Administrative & support | 2021 |
| Sunjet Vacations Limited | Administrative & support | 2021 |
| Sunleaf Ltd | Other services | 2012 |
| Sunleigh Court Limited | Households | 2000 |
| Sunlight Capital Limited | Real estate | 2018 |
| Sunlight Plus Ltd | Wholesale & retail | 2023 |
| Sunny Care Ltd. | Health & social care | 2015 |
| Sunnydene Lodge (Freehold) Limited | Households | 2000 |