| Shree Swaminarayan Mandir Bhuj | Other services | 2016 |
| Shree Swaminarayan Mandir Oldham | Other services | 2018 |
| Shree Swaminarayan Vidyalay | Education | 2017 |
| Shreeji Packaging Ltd | Hospitality | 2014 |
| Shrit Enterprise Ltd | Wholesale & retail | 2025 |
| Shruchi Creation Ltd | Wholesale & retail | 2024 |
| SHS Accounting Limited | Professional & scientific | 2024 |
| Shuban Ventures Limited | Real estate | 2015 |
| Shubham Estates Limited | Real estate | 2019 |
| Shumaisa's Tutoring Ltd | Administrative & support | 2024 |
| Shure Elearning Limited | Education | 2017 |
| Shuttlechap Holdings Ltd | Real estate | 2022 |
| Shyam Building Services Ltd | Construction | 2013 |
| SI Consultants (London) Limited | Information & communication | 2013 |
| Siani Property Limited | Real estate | 2025 |
| Sibahi Limited | Professional & scientific | 2021 |
| Sicd Construction Ltd | Construction | 2020 |
| Sicher Mayor Ltd | Financial services | 2022 |
| Sicily Curated Ltd | Administrative & support | 2025 |
| Siddhiraa Spice and Treads Ltd | Wholesale & retail | 2025 |
| Sienic Solutions Ltd | Wholesale & retail | 2024 |
| Sigma Ceilings Ltd | Construction | 2019 |
| Sigma Security Ltd | Administrative & support | 2015 |
| Signalspace Ltd | Information & communication | 2024 |
| Signature Fragrances Limited | Wholesale & retail | 2017 |
| Signature Model & Acting Agency Limited | Arts & recreation | 2016 |
| Signature Property Management Ltd | Real estate | 2011 |
| Signet (UK) Limited | Wholesale & retail | 2007 |
| Sikh Adaptive Solutions Ltd | Health & social care | 2022 |
| Silat Ltd | Administrative & support | 2024 |
| Silentrainer Limited | Information & communication | 2025 |
| Silicon Camp Ltd | Wholesale & retail | 2025 |
| Silicon IT Limited | Information & communication | 2011 |
| Silisalt Ltd | Wholesale & retail | 2026 |
| Silva Bullet Investments Ltd | Real estate | 2020 |
| Silver Archery Limited | Wholesale & retail | 2013 |
| Silver Hammer (UK) Limited | Professional & scientific | 2000 |
| Silver Mint & Co. Limited | Real estate | 2025 |
| Silver Oak Care Ltd | Health & social care | 2019 |
| Silver Operations Ltd | Professional & scientific | 2023 |
| Silveridge Limited | Wholesale & retail | 2002 |
| Silvermont Jewels Ltd | Wholesale & retail | 2026 |
| Silverstone House Limited | Wholesale & retail | 2026 |
| Silvery Willows Private Limited | Wholesale & retail | 2024 |
| Sima Consulting Ltd | Professional & scientific | 2016 |
| Sima Immobiliare Ltd | Financial services | 2020 |
| Simba Invest Limited | Real estate | 2026 |
| Simel Consulting Services Limited | Information & communication | 2019 |
| Simia Wall Consultants Limited | Professional & scientific | 2016 |
| Simia Wall LLP | | 2018 |
| Simla (Dordon) Limited | Extraterritorial | 2009 |
| Simon Holdings Limited | Professional & scientific | 1967 |
| Simon J Collins & Associates Limited | Professional & scientific | 2017 |
| Simon Lemcke Limited | Professional & scientific | 2015 |
| Simon Stokes Ltd | Professional & scientific | 2015 |
| Simone Pave Limited | Professional & scientific | 2016 |
| Simpgate Limited | Real estate | 1981 |
| Simphonia Consulting Ltd | Information & communication | 2025 |
| Simple Glaze Limited | Construction | 2024 |
| Simple Health Ltd | Wholesale & retail | 2025 |
| Simplify Group Limited | Professional & scientific | 2016 |
| Simplify Legalz Limited | Professional & scientific | 2018 |
| Simplify Workforce Limited | Information & communication | 2019 |
| Simplify Your ER Limited | Professional & scientific | 2023 |
| Simply Care (UK) Ltd | Health & social care | 2011 |
| Simply Care Ltd | Health & social care | 2011 |
| Simply Food & Drink Co Limited | Hospitality | 2003 |
| Simpson & SON Property Services Limited | Wholesale & retail | 2016 |
| Simpson Property Services (UK) Limited | Wholesale & retail | 2009 |
| Sinai Property Limited | Real estate | 2025 |
| Sininvest Ltd | Wholesale & retail | 2020 |
| Sirampur Limited | Hospitality | 2019 |
| Sirio Trafalgar Ltd | Administrative & support | 2020 |
| Sirius Global Solutions Limited | Information & communication | 2026 |
| Sirushti Limited | Professional & scientific | 2009 |
| Sital D.O Ltd | Wholesale & retail | 2015 |
| Site Link Construction Limited | Construction | 2022 |
| Siteiq Ltd | Professional & scientific | 2024 |
| Siwji Medics Limited | Health & social care | 2022 |
| SIX4SIX Property Ltd | Real estate | 2023 |
| Sixsmith Management Ltd | Professional & scientific | 2014 |
| Sixteen Beauty Limited | Other services | 2025 |
| Sixteen Rentals Limited | Real estate | 2017 |
| Sixten School | Education | 2022 |
| SJ Property Group Ltd | Real estate | 2016 |
| SJM Macro Consultants Limited | Financial services | 2022 |
| SJM UK Property Limited | Construction | 2011 |
| SK Properties 7 Limited | Real estate | 2016 |
| SKA Detail KPR 1 Limited | Real estate | 2024 |
| SKA Detail KPR 2 Limited | Real estate | 2024 |
| SKA Detail Valetta Limited | Real estate | 2024 |
| Skaila Kanga Ltd | Information & communication | 2019 |
| Skardon Consulting Ltd | Information & communication | 2022 |
| SKB Cleaning Services Ltd | Administrative & support | 2024 |
| SKB Medical Services Ltd | Health & social care | 2016 |
| Skilltree Games Ltd | Information & communication | 2023 |
| Skiy Ltd | Real estate | 2021 |
| SKM Care+ Limited | Wholesale & retail | 2025 |
| SKM Tech PVT Ltd | Professional & scientific | 2022 |
| SKM Technologies PVT Ltd | Information & communication | 2018 |