| Prime Avit Ltd | Information & communication | 2019 |
| Privatepsychiatryexpert Ltd | Health & social care | 2019 |
| Profect Solutions Ltd | Information & communication | 2025 |
| Qwikchain Ltd | Financial services | 2021 |
| R & N Publishing Limited | Information & communication | 2020 |
| RA Building & Landscaping Ltd | Administrative & support | 2023 |
| Rebecca Clementine Ltd | Professional & scientific | 2019 |
| Reese Properties Limited | Real estate | 2015 |
| Render and Stucco Design Ltd | Construction | 2017 |
| Retroshell Ltd | Wholesale & retail | 2014 |
| Rfpk Holdings Limited | Financial services | 2026 |
| Rickmansworth Ltd | Real estate | 2026 |
| RMDT26 Ltd | Real estate | 2026 |
| Rockingham Forest Park Limited | Agriculture & fishing | 2001 |
| Ronald Harwood Limited | Other services | 1962 |
| S & D Assets Limited | Real estate | 2025 |
| S Ramirez Media Ltd | Administrative & support | 2022 |
| Safe GAS Heating & Plumbing Ltd | Construction | 2009 |
| Saggio Limited | Information & communication | 2024 |
| Saltbox Design and Build Ltd | Construction | 2020 |
| Sandy Bar Limited | Professional & scientific | 2006 |
| Sarah & Anna Rowden Ltd | Hospitality | 2026 |
| Sathi Bangladeshi Restaurant Ltd | Hospitality | 2014 |
| Scott Morgan Group Ltd | Real estate | 2018 |
| Securi-Smart Ltd | Administrative & support | 2014 |
| Senate ( Reynard’S Way) Ltd | Construction | 2025 |
| Senate (ST Albans) Ltd | Real estate | 2026 |
| Senate Associates Limited | Arts & recreation | 2024 |
| Senate Bespoke (Radlett) Ltd | Construction | 2024 |
| Senate Bespoke (the Uplands) Ltd | Construction | 2025 |
| Senate Bespoke Construction Ltd | Construction | 2015 |
| Senate Construction Ltd | Construction | 2024 |
| Senate Developments Limited | Construction | 2019 |
| Senate Land Ltd | Real estate | 2018 |
| Senate Projects Ltd | Real estate | 2019 |
| Senecan Limited | Professional & scientific | 2026 |
| Sheard Biotech Ltd | Professional & scientific | 2017 |
| Sienna-Mia Properties Ltd | Real estate | 2019 |
| Simco Homes (Amersham Hill Cricket Club) Limited | Construction | 2024 |
| Simco Homes (North Hill Farm) Limited | Construction | 2024 |
| Simco Homes (Stratton Chase Drive) Limited | Construction | 2023 |
| Simco Homes (West END Sevenoaks) Ltd | Construction | 2023 |
| SMY Property Services Limited | Construction | 1984 |
| Sond Investments Ltd | Real estate | 2020 |
| Sout AL Khaleej Limited | Information & communication | 2014 |
| South Cottage Management Limited | Real estate | 1998 |
| Southern Homes Letting LLP | | 2003 |
| Spark Creations Ltd | Information & communication | 2010 |
| SPR Electrical Services Ltd | Construction | 2016 |
| Spry Consult Ltd | Information & communication | 2010 |
| Stockman Plastering Ltd | Construction | 2017 |
| Stronghold Building & Refurbishment Limited | Construction | 2023 |
| Sugarfunk Limited | Information & communication | 2005 |
| Sustainable Infrastructure Partnership Ltd | Financial services | 2009 |
| SW Brokers Limited | Wholesale & retail | 2023 |
| Sweet Baby Sleeping Ltd | Health & social care | 2021 |
| T & D Plumbing & Heating Ltd | Construction | 2023 |
| T Sparks Electrical Services Limited | Construction | 2015 |
| THE Bowman Trading Estate (Stevenage) Limited | Construction | 1987 |
| THE Calm and Happy Place Company Ltd | Education | 2020 |
| THE Enchanted Catering Company Ltd | Hospitality | 2021 |
| THE Food Buddies Ltd | Hospitality | 2019 |
| THE Heronsgate Trading Estate Limited | Construction | 1987 |
| THE Laine Artist Group Limited | Arts & recreation | 1977 |
| THE Three Horseshoes (Knockholt) Ltd | Hospitality | 2016 |
| THE Three Horseshoes (Knockholt) Properties Ltd | Real estate | 2023 |
| THE Yuulo Organisation Limited | Arts & recreation | 2017 |
| THE Zennity Room Limited | Other services | 2026 |
| TK & Sons Grab & Plant Services Ltd | Construction | 2018 |
| TLS Renewable Consulting Ltd | Professional & scientific | 2009 |
| TLS Solar Limited | Energy | 2009 |
| Topline Scaffolding Limited | Construction | 2017 |
| Trade Capital Management Ltd. | Administrative & support | 2017 |
| Tradelink Solutions Limited | Professional & scientific | 1995 |
| Trading Careers Ltd | Professional & scientific | 2024 |
| Tropical Marine Centre (2012) Ltd | Agriculture & fishing | 2012 |
| Tropical Marine Centre Limited | Agriculture & fishing | 2009 |
| Trowel-Worx Limited | Construction | 2011 |
| Tyrone Plant Repairs Limited | Construction | 2011 |
| U&I Beauty Ltd | Other services | 2026 |
| ULS Trading Ltd | Wholesale & retail | 2026 |
| Ultimate Destinations (UK) Ltd | Administrative & support | 2012 |
| ULTRASOUND4U Limited | Health & social care | 2020 |
| UNI4MERS Ltd | Information & communication | 2023 |
| Unique Drainage Ltd | Administrative & support | 2016 |
| Unstoppable Rugby Limited | Arts & recreation | 2024 |
| V & M Refurbishments Ltd | Construction | 2022 |
| Vamoa Ltd | Professional & scientific | 2024 |
| Vanden Ltd | Manufacturing | 2022 |
| Vintage & Prestige of Northampton Limited | Wholesale & retail | 2020 |
| W12 Holdings Ltd | Construction | 2016 |
| W12 Plant Hire Ltd | Administrative & support | 2021 |
| Watford Haulage Services Limited | Transport & logistics | 2023 |
| Wharfedale Hydro Power Limited | Energy | 2008 |
| Wickaman Limited | Information & communication | 2012 |
| Woodford Assets (Oakwood Road) Limited | Real estate | 2025 |
| Wrest Park Limited | Construction | 2008 |
| ZAW Consultancy Limited | Professional & scientific | 2024 |
| ZE Enterprise Ltd | Administrative & support | 2017 |