| Ssps Capital Limited | Professional & scientific | 2024 |
| SSS Training Ltd | Professional & scientific | 2024 |
| SST1 Ltd | Real estate | 2023 |
| ST Accounting & Finance Services Ltd | Professional & scientific | 2026 |
| ST Alexius Healthcare Ltd | Health & social care | 2022 |
| ST Drains Limited | Construction | 2025 |
| ST Food Wine Ltd | Wholesale & retail | 2024 |
| ST Margaret's Park Residents Company Limited | Households | 2017 |
| ST Meat Wholesaler Limited | Wholesale & retail | 2022 |
| ST Neots Nails Limited | Other services | 2023 |
| ST. Neots Flavour Limited | Hospitality | 2024 |
| ST. Neots Spice Ltd | Hospitality | 2019 |
| St.James Bank Limited | Financial services | 2005 |
| Stab Finance LP | | 2014 |
| Stackgate Ltd | Information & communication | 2018 |
| Staff Right Recruit Ltd | Administrative & support | 2021 |
| Stage Shield Ltd | Information & communication | 2025 |
| Stagprojects Limited | Construction | 2021 |
| Stain Investments Ltd | Financial services | 2021 |
| Stallion Security Services Ltd | Administrative & support | 2026 |
| Stamford Bridge Limited | Extraterritorial | 2005 |
| Stamford Hill & Brown Holdings Limited | Financial services | 2026 |
| Stampsphilately Ltd | Wholesale & retail | 2020 |
| Stan Hill Ltd | Construction | 2025 |
| Stan Kelly & Co Ltd | Other services | 2010 |
| Stan Kelly Consult Limited | Administrative & support | 2011 |
| Stan Kelly Probate Services Ltd | Professional & scientific | 2023 |
| Stanley Bites Ltd | Hospitality | 2024 |
| Star Catering (Brighton) Limited | Wholesale & retail | 2011 |
| Star Catering Services Limited | Hospitality | 2024 |
| Star Catering Supplies Limited | Wholesale & retail | 1993 |
| Star Health Ltd | Health & social care | 2024 |
| Star Home Builders Ltd | Construction | 2017 |
| Star Mangal Ltd | Hospitality | 2026 |
| Star Motorcycles Services Ltd | Wholesale & retail | 2025 |
| Star Pizza Ilkeston Limited | Hospitality | 2019 |
| Star Rise Construction Ltd | Construction | 2022 |
| Star Street Garage Limited | Wholesale & retail | 2012 |
| Star Tax Consultants Ltd | Professional & scientific | 2016 |
| Starblack Press Ltd | Arts & recreation | 2020 |
| Starburger Limited | Wholesale & retail | 1983 |
| Starelectronics Ltd | Wholesale & retail | 2020 |
| Stargold Properties Limited | Real estate | 2000 |
| Starkiss Ltd | Wholesale & retail | 2022 |
| Starling Care & Support Limited | Health & social care | 2020 |
| Starma LP | | 2016 |
| Starrs Green Enterprise Limited | Financial services | 2017 |
| Stars Day Service (LDN) Limited | Health & social care | 2025 |
| Stars Day Service Limited | Health & social care | 2019 |
| Stars Day Service US Ltd | Health & social care | 2026 |
| Startduck Global Ltd | Wholesale & retail | 2023 |
| Statera IKP Ltd | Health & social care | 2019 |
| Statsseed Limited | Real estate | 2024 |
| Staurus Foods Limited | Wholesale & retail | 2022 |
| Staurus Group Limited | Wholesale & retail | 2021 |
| Stealth UK Limited | Other services | 2001 |
| Steel Bennetts Limited | Manufacturing | 2022 |
| Steel Honour Alliance Ltd | Wholesale & retail | 2024 |
| Stelyn Properties Limited | Households | 2011 |
| Stemics Stars Ltd | Other services | 2014 |
| Stentor Consulting Ltd | Professional & scientific | 2019 |
| Stephen Hawes & Co. Ltd. | Professional & scientific | 2019 |
| Stephen James (Automotive) Limited | Wholesale & retail | 2015 |
| Stephen James Alliance Limited | Financial services | 2018 |
| Stephen James Group Trading LLP | | 2007 |
| Steps Joinery Ltd | Construction | 2017 |
| Sterling Auto Sales Limited | Extraterritorial | 2005 |
| Sterling Auto Services Limited | Wholesale & retail | 2022 |
| Sterling Auto Shop Ltd | Wholesale & retail | 2020 |
| Sterling Court Management Limited | Households | 1990 |
| Sterling Creations Limited | Manufacturing | 2003 |
| Sterling Financial Solutions Ltd | Construction | 2016 |
| Sterling Way Investments Limited | Real estate | 2025 |
| Steve Clark Communications Limited | Professional & scientific | 2021 |
| Steve O Holding Limited | Health & social care | 2018 |
| Stevecilla Limited | Health & social care | 2012 |
| Stevenage Dental Practice Limited | Health & social care | 2010 |
| Stewardship Limited | Hospitality | 2012 |
| STI Amtico Flooring Limited | Construction | 2013 |
| Sticklewood Productions Limited | Information & communication | 2026 |
| Stig Holding Ltd | Financial services | 2026 |
| Stirkscatering Limited | Hospitality | 2024 |
| Stitch Master Ltd | Other services | 2021 |
| STO Development Ltd | Construction | 2026 |
| Stock Checker Limited | Other services | 2021 |
| Stockbridge House Management Company Limited | Households | 1992 |
| Stocker Digital Consulting Limited | Information & communication | 2024 |
| Stoke and Wick Ltd | Real estate | 2022 |
| Stone Beach Modernist Club Ltd | Wholesale & retail | 2018 |
| Stone Steps and Paving Ltd | Construction | 2018 |
| Stonebrook Estates Ltd | Real estate | 2025 |
| Stonecare Consultancy Ltd | Health & social care | 2026 |
| Stonecroft Homes Ltd | Real estate | 2025 |
| Stoneshd Ltd | Real estate | 2023 |
| Stordent Ltd | Health & social care | 2025 |
| Stortford Boiler Solution Ltd | Construction | 2024 |
| Stotz Kaur Ltd | Health & social care | 2019 |
| Stouchwood Limited | Other services | 2014 |
| STP Property Development Limited | Construction | 2024 |
| STR 2007 Ltd | Construction | 2019 |