| Selinger Consultants Ltd | Professional & scientific | 2011 |
| Serge Hill Project CIC | Education | 2023 |
| SG Cricket Coaching Ltd | Education | 2026 |
| Silva Sales Limited | Wholesale & retail | 2023 |
| Simcross Welding Services Limited | Manufacturing | 1999 |
| Simply PA Ltd | Education | 2023 |
| Skayedzan Limited | Professional & scientific | 2015 |
| Smrr Professional Traders Ltd | Wholesale & retail | 2015 |
| Snobby Studios Ltd | Manufacturing | 2024 |
| Solux Renewables Ltd | Construction | 2025 |
| Specto Motors Ltd | Wholesale & retail | 2024 |
| Spencer’S Electrical Services Ltd | Construction | 2025 |
| Spherus Ltd | Information & communication | 2006 |
| Spiral Property Management Ltd | Real estate | 2022 |
| Splashy Feet Ltd | Education | 2025 |
| Spring Social Limited | Information & communication | 2015 |
| SS Medical Forum Limited | Health & social care | 2025 |
| SSR Fried and Peri Peri Ltd | Hospitality | 2021 |
| Stayops Limited | Hospitality | 2026 |
| Stephen Deering Ltd | Professional & scientific | 2026 |
| Stevenage SG1 Ltd | Real estate | 2026 |
| Stewart Management Company (Watford) Limited | Households | 1990 |
| Stoke on Bent Ltd | Information & communication | 2014 |
| Stonetower Mortgages Limited | Financial services | 2022 |
| Suman Enterprises Limited | Real estate | 1979 |
| Sweena Enterprises Ltd | Education | 2026 |
| Swift Art Studios Ltd | Arts & recreation | 2026 |
| T&E Herbert’S Ltd | Administrative & support | 2020 |
| Taheri Hardware Limited | Wholesale & retail | 2009 |
| Tapped OUT Plumbing & Heating Ltd | Construction | 2015 |
| TBS Building Ltd | Construction | 2019 |
| TE Shipping Limited | Transport & logistics | 2005 |
| Teco Limited | Manufacturing | 2017 |
| Teds Bears Limited | Extraterritorial | 2025 |
| Telegroup Limited | Information & communication | 1992 |
| That Little Coffee Shop Ltd | Hospitality | 2021 |
| THC Consultancy Limited | Professional & scientific | 2014 |
| THE Abbeyfield West Herts Society Limited | Hospitality | 1972 |
| THE African Business Consortium Ltd. | Other services | 2023 |
| THE Appaloosa Horse Club (UK) Limited | Other services | 2000 |
| THE Birthbliss Doula Academy Ltd | Education | 2025 |
| THE Croxley Great Barn Foundation | Education | 2012 |
| THE Curious Department Limited | Wholesale & retail | 2016 |
| THE Data Factory Global Ltd | Information & communication | 2024 |
| THE Global VFX Company Limited | Professional & scientific | 2026 |
| THE Glossary Hair Company Ltd | Other services | 2020 |
| THE Health Supply Company ("the Health Supply Co.") Ltd. | Wholesale & retail | 2018 |
| THE Mull Management Company Limited | Households | 2014 |
| THE Noor Mahal Abbots Ltd | Hospitality | 2018 |
| THE Old Chapel Residents Ltd | Households | 2024 |
| THE Old Quarters Limited | Manufacturing | 2025 |
| THE Pet Emporium Limited | Other services | 2011 |
| THE PM Trust | Education | 2018 |
| THE Rumble Club Ltd | Professional & scientific | 2023 |
| THE Signature Organisation Ltd | Real estate | 2018 |
| The-Concierge (UK) Ltd | Administrative & support | 2025 |
| Theclub Group Ltd. | Hospitality | 2019 |
| Three Acres (WD4) Developments Ltd | Construction | 2020 |
| Three Acres (WD4) Management Ltd | Households | 2026 |
| Three Rivers Homecare Limited | Administrative & support | 2021 |
| Tiny Abbots Properties Ltd | Real estate | 2021 |
| TOM Stuart-Smith Limited | Administrative & support | 2006 |
| TOM Stuart-Smith Trustees Limited | Professional & scientific | 2025 |
| Top Point Medical Services Limited | Health & social care | 2014 |
| Trans Concept Limited | Transport & logistics | 2018 |
| Trans Continental Enterprises Limited | Wholesale & retail | 2013 |
| Trends Telecom Ltd | Information & communication | 2013 |
| Trimtots C.I.C. | Education | 2015 |
| True Colours Limited | Professional & scientific | 2004 |
| Tudor Rose Tutoring Ltd | Education | 2024 |
| Tutu Apparel Ltd | Wholesale & retail | 2025 |
| UK Star Properties Ltd | Real estate | 2026 |
| Unique Nails 63 Limited | Other services | 2026 |
| Urbn Woodworks Limited | Construction | 2026 |
| Vape Pro Ltd | Wholesale & retail | 2025 |
| Vapecaseofficial Ltd | Manufacturing | 2025 |
| Variety Retail Limited | Wholesale & retail | 2025 |
| VDP Investments Limited | Financial services | 2025 |
| VDP Properties Limited | Real estate | 2023 |
| Vector People Consultants Limited | Administrative & support | 2021 |
| VGM Construction & Develop. Ltd | Construction | 2026 |
| Vikson Investment Ltd | Financial services | 2024 |
| Visana Limited | Professional & scientific | 2002 |
| Visualize Homes Ltd | Real estate | 2022 |
| VMA Infotech Ltd | Information & communication | 2024 |
| Vogue Bespoke Interiors Ltd | Manufacturing | 2019 |
| Waddell Literary Partnership LLP | | 2022 |
| Wareham Estates LLP | | 2024 |
| Waterdale Properties Limited | Extraterritorial | 2011 |
| WAX and Wood Ltd | Manufacturing | 2023 |
| WE BIZ (UK) Ltd | Wholesale & retail | 2014 |
| Westmorland Living Limited | Real estate | 2024 |
| WF6 Limited | Real estate | 2024 |
| Win-Win Recruitment Ltd | Administrative & support | 2018 |
| Wireless IT Support Ltd | Information & communication | 2019 |
| Wisdom Drops Limited | Administrative & support | 2011 |
| Works Digital Limited | Professional & scientific | 2006 |
| Yazhini Infotech Limited | Information & communication | 2016 |
| Yello Design Studio Limited | Professional & scientific | 2008 |
| ZTW Healthcare Limited | Health & social care | 2009 |