| Sprintegra Consulting Ltd | Professional & scientific | 2010 |
| Spurlands Estates Limited | Real estate | 2018 |
| SQ Building Design Ltd | Construction | 2025 |
| SQ Properties (86 Goswell Road) Limited | Real estate | 2005 |
| Square Bridge Consultants Ltd | Information & communication | 2023 |
| Square Deal Property Investments Ltd | Real estate | 2019 |
| Square Mile Financial Planning Limited | Professional & scientific | 2004 |
| Square Mile Wealth Limited | Financial services | 2004 |
| Square Pegs Occupational Therapy Ltd | Health & social care | 2017 |
| Square Reason Advisory Ltd | Administrative & support | 2023 |
| SQUARE1 Projects Limited | Professional & scientific | 2009 |
| Squidex Solutions Ltd | Professional & scientific | 2017 |
| SR Dynamics Ltd | Information & communication | 2026 |
| SR Surveying Ltd | Professional & scientific | 2025 |
| SR Vocational Rehabilitation Limited | Health & social care | 2010 |
| Srax UK Limited | Real estate | 2020 |
| SRB Estates Ltd | Real estate | 2023 |
| SRB Property Innovations Ltd | Hospitality | 2024 |
| SRD Technical Limited | Administrative & support | 2016 |
| Srdb Holdings Ltd | Financial services | 2025 |
| Sree Properties Ltd | Real estate | 2020 |
| Sree SAI Ventures Ltd | Wholesale & retail | 2024 |
| Sreekrithikd PVT Ltd | Information & communication | 2016 |
| SRG Solutions Ltd | Administrative & support | 2022 |
| SRI Datta Limited | Information & communication | 2018 |
| SRI Garuda Ltd | Real estate | 2025 |
| SRI Guru Singh Sabha Gurdwara Watford | Other services | 2023 |
| SRI Koneswara Hindu College Old Students Association | Health & social care | 2017 |
| SRI Lankan Accountants and Finance Professionals in UK CIC | Health & social care | 2025 |
| SRI Lankan Community of Watford CIC | Other services | 2026 |
| SRI Mahalakshmi Restaurants Ltd | Hospitality | 2024 |
| SRI SAI Books Limited | Wholesale & retail | 2023 |
| SRI SAI First Investments Ltd | Real estate | 2020 |
| SRI Shiv Limited | Wholesale & retail | 2025 |
| SRI Shiv Services Limited | Professional & scientific | 2023 |
| SRI Vari Hotels Ltd | Financial services | 2019 |
| Srilankan Ltd | Real estate | 2026 |
| Sriram Abhi Ltd | Hospitality | 2012 |
| Sriram Holdings Group Limited | Financial services | 2025 |
| Sriram JAY Limited | Hospitality | 2022 |
| Sriram Properties Limited | Real estate | 2020 |
| Sriram Support Services Limited | Health & social care | 2023 |
| Sriram Tanu Limited | Hospitality | 2014 |
| SRIRAM1 Properties Limited | Real estate | 2020 |
| Sriyanic Ltd | Information & communication | 2021 |
| Sriyank Ltd | Real estate | 2021 |
| SRN Security Consultancy Ltd | Information & communication | 2023 |
| SRP Growth Investments Ltd | Financial services | 2026 |
| SRP Services Limited | Professional & scientific | 2021 |
| SRS Health Limited | Health & social care | 2019 |
| SRS Renobuild Ltd | Construction | 2024 |
| Srtechinfo Ltd | Information & communication | 2026 |
| SRV Assets Ltd | Real estate | 2025 |
| SRV Consulting Ltd | Information & communication | 2024 |
| Srvirdee Property Holdings Ltd | Real estate | 2026 |
| Srvl Holdings Limited | Financial services | 2025 |
| Srvl Investments Limited | Real estate | 2025 |
| SS Bakrania Limited | Real estate | 2020 |
| SS Company Ltd | Real estate | 2023 |
| SS Party Ventures Ltd | Hospitality | 2020 |
| SS Payroll Ltd | Administrative & support | 2025 |
| SS Sandwich Club Ltd | Hospitality | 2025 |
| SS Social Enterprise Ltd | Hospitality | 2020 |
| SS South Private Limited | Hospitality | 2026 |
| SS14 Ltd | Wholesale & retail | 2019 |
| SSA Education Solutions PVT. Ltd. | Education | 2016 |
| SSA Services Ltd | Health & social care | 2015 |
| Ssaa Family Limited | Real estate | 2025 |
| Ssad Holdings Ltd | Financial services | 2024 |
| Ssage Ltd | Arts & recreation | 2023 |
| Ssaoraconsulting Ltd | Other services | 2012 |
| Ssdm Group Ltd | Health & social care | 2020 |
| Ssgk Enterprises Ltd | Wholesale & retail | 2021 |
| SSM Group Limited | Financial services | 2020 |
| SSN Real Estate Ltd | Real estate | 2025 |
| SSQ Universal Ltd | Hospitality | 2025 |
| SSS Essex Ltd | Arts & recreation | 2016 |
| SSS Legal Ltd | Professional & scientific | 2016 |
| SSS Services Ltd | Professional & scientific | 2021 |
| Sssdk Limited | Information & communication | 2017 |
| SST Medical Properties Limited | Real estate | 2015 |
| Sstech Consulting Ltd | Information & communication | 2013 |
| Ssvb Ltd | Professional & scientific | 2019 |
| ST Albans Ashbury Court RTM Company Limited | Households | 2024 |
| ST Albans Gardening Services Ltd | Administrative & support | 2014 |
| ST Barts Day Nurseries Limited | Health & social care | 2017 |
| ST Holdings Ltd | Financial services | 2023 |
| ST John Court Management Company Limited | Households | 2002 |
| ST Josephs Pre-School Ltd | Education | 2010 |
| ST Luke's Court Freehold Company Limited | Real estate | 2008 |
| ST Luke's Management Company Limited | Real estate | 1988 |
| ST Michaels Mobile Service Ltd | Wholesale & retail | 2018 |
| ST Minas Medical Ltd | Health & social care | 2021 |
| ST Portfolio Ltd | Real estate | 2023 |
| ST. Anna International Trading Ltd | Wholesale & retail | 2018 |
| ST. Columba's House Management Company (Walthamstow) Limited | Households | 1982 |
| ST. Elmo Mansions Limited | Real estate | 1994 |
| ST. George & ST. Mina Care Limited | Health & social care | 2013 |
| ST. Luke's Court Head Lease Company Limited | Real estate | 2012 |
| ST. Martin's Close Management Company Limited | Households | 1989 |