| Stylers Waltham Cross Limited | Other services | 2025 |
| Subaruforesterparts Ltd | Manufacturing | 2020 |
| Subpaye Bureau Limited | Professional & scientific | 2025 |
| Success HAA Limited | Wholesale & retail | 2019 |
| Sula Energy Services Ltd | Construction | 2019 |
| Sultan Mobile & Accessories Ltd | Wholesale & retail | 2025 |
| Sumarie Limited | Manufacturing | 2011 |
| Summer Domiciliary Care Ltd | Health & social care | 2024 |
| Summer Homes Ltd | Construction | 2017 |
| Summit Build Limited | Construction | 2022 |
| Sunbul Properties Ltd | Real estate | 2023 |
| Sunburst Snacks Ltd | Manufacturing | 2000 |
| Suntower Ltd | Financial services | 2016 |
| Super Clean Plus Ltd | Administrative & support | 2014 |
| Supplywave Ltd | Wholesale & retail | 2024 |
| Surecast Limited | Construction | 1999 |
| Suresafe Training Ltd | Education | 2020 |
| Surg Innovations Ltd | Education | 2019 |
| Surprise ME London Ltd | Wholesale & retail | 2018 |
| Surveying and Estimating (London) Ltd | Professional & scientific | 2025 |
| Sutera Limited | Extraterritorial | 2017 |
| Suzerain Limited | Professional & scientific | 2018 |
| Suzy Smith Racing Limited | Arts & recreation | 2020 |
| Sven Construction Ltd | Construction | 2009 |
| SVF Limited | Financial services | 2018 |
| SVI Quality Construction Ltd | Construction | 2019 |
| SVS Bespoke Furniture Ltd | Manufacturing | 2022 |
| SVS Scaffolding Ltd | Construction | 2020 |
| Swagger Mania Records Ltd | Information & communication | 2020 |
| Swan Vision Ltd | Professional & scientific | 2026 |
| Swceventltd Ltd | Hospitality | 2026 |
| Sweet Lavender Cakes Ltd | Manufacturing | 2022 |
| Sweet Mary Ltd | Other services | 2018 |
| Sweetmotion Limited | Wholesale & retail | 2011 |
| Sweets in the City Limited | Hospitality | 2009 |
| Swift Logistics Solutions Ltd | Transport & logistics | 2023 |
| System Building Services Ltd | Public administration | 2012 |
| SZ Easy Cleaning Ltd | Administrative & support | 2021 |
| Szampion Limited | Wholesale & retail | 2017 |
| T a Hair Limited | Other services | 2024 |
| T I M Electrical Solutions Ltd | Construction | 2020 |
| T J R & M Limited | Health & social care | 2014 |
| T Pickhaver Ltd | Professional & scientific | 2025 |
| T&F Financial Services Ltd | Administrative & support | 2026 |
| T3CH Flicks Ltd | Information & communication | 2018 |
| T64 Capital Limited | Administrative & support | 2025 |
| Tabak Properties Ltd | Real estate | 2024 |
| Tack Consultancy Limited | Professional & scientific | 2024 |
| Tadpole Training Ltd | Education | 2019 |
| TAF Productions Ltd | Information & communication | 2024 |
| Tagco Group Limited | Construction | 2023 |
| TAI NUI Properties Limited | Real estate | 2020 |
| Tailor Industries Limited | Administrative & support | 2013 |
| Takeley Domestic & Industrial Washing Limited | Other services | 2017 |
| Takeley Ironing Services Limited | Other services | 2016 |
| Talitha Arts | Arts & recreation | 2010 |
| TAM & Co Ltd | Construction | 2014 |
| Tamarind Care Limited | Other services | 1994 |
| Tams Products Limited | Administrative & support | 2018 |
| Tangu Construction Ltd | Construction | 2026 |
| Tanning Services Dartford Limited | Other services | 2025 |
| TAO Capital Holding Limited | Financial services | 2021 |
| TAP Art and Design Limited | Professional & scientific | 2021 |
| Tara and Sese Property Group Ltd | Real estate | 2025 |
| Target Fitness Limited | Other services | 2000 |
| Tate Total Solutions Limited | Construction | 2017 |
| Taunton Court Management Co Limited | Households | 1991 |
| Tavakkal Enterprise Ltd | Administrative & support | 2020 |
| Tax Agents for ALL Ltd | Professional & scientific | 2021 |
| TAY & Chase Utilities Ltd | Professional & scientific | 2019 |
| Tayimoor Ltd | Wholesale & retail | 2018 |
| Taylis Homes Ltd | Other services | 2018 |
| Taylor & Crawley Limited | Wholesale & retail | 1996 |
| TBS Custodial Limited | Wholesale & retail | 2024 |
| TBS Poly Holdings Limited | Administrative & support | 2020 |
| TBS Polycarbonates Limited | Wholesale & retail | 2020 |
| TC Commercial Repairs Limited | Wholesale & retail | 2022 |
| TC GAS Utilities Ltd | Construction | 2026 |
| TC Lighting Tech Limited | Construction | 2018 |
| TD Home Improvements Services Limited | Construction | 2015 |
| TD Sound Limited | Information & communication | 2013 |
| Tdas Gold Limited | Real estate | 2024 |
| Team BUILDERS47 Limited | Construction | 2018 |
| Team Venture Properties Ltd | Real estate | 2021 |
| Tease Limited | Wholesale & retail | 2024 |
| TEC Corp Ltd | Agriculture & fishing | 2022 |
| Tech 1088 Limited | Construction | 2013 |
| Tech Logic Consulting Limited | Information & communication | 2011 |
| Techcare Consulting Ltd | Professional & scientific | 2024 |
| Technix IT Ltd | Information & communication | 2013 |
| Technosure Investment Limited | Wholesale & retail | 2025 |
| Teekay Sickle Cell Foundation Limited | Health & social care | 2025 |
| Teerayshine Limited | Administrative & support | 2023 |
| Teesproperty Limited | Real estate | 2024 |
| TEK Law Limited | Professional & scientific | 2025 |
| TEK M Properties Ltd | Real estate | 2021 |
| Telch Limited | Real estate | 2021 |
| Telford Homes (Alperton) NO.1 Limited | Construction | 2022 |
| Telford Homes (LEB) Limited | Construction | 2022 |
| Telford Homes (Midsummer Blvd) NO.1 Limited | Construction | 2022 |