| SAI Finance Ltd | Financial services | 2020 |
| SAI Hrisam Property Limited | Real estate | 2026 |
| SAI Services Limited | Information & communication | 2017 |
| Saib Consultancy Limited | Administrative & support | 2013 |
| Saib Properties Ltd | Real estate | 2018 |
| Saif Air PLC | Transport & logistics | 2017 |
| Saigan Limited | Information & communication | 2019 |
| Sainisons PD Ltd | Construction | 2021 |
| Saire Limited | Wholesale & retail | 2024 |
| Saisha Consultancy Services Limited | Information & communication | 2015 |
| Saishain Limited | Real estate | 2025 |
| Saitek Roofing Ltd | Construction | 2022 |
| Sajdahuk Ltd | Wholesale & retail | 2024 |
| SAJHA2 UK Limited | Real estate | 2022 |
| Sakoon Education Ltd | Education | 2020 |
| Sakr Technologies Limited | Professional & scientific | 2024 |
| Sakura Moon Limited | Other services | 2021 |
| Salamander Fire Solutions Limited | Financial services | 2020 |
| Saleem Fabrics Ltd | Wholesale & retail | 2025 |
| Salehi Contracting Ltd | Professional & scientific | 2017 |
| Salisbury Court (Chiswick) Property Management Limited | Households | 1967 |
| Salon System Limited | Professional & scientific | 1989 |
| Salonee Interiors Ltd | Manufacturing | 2022 |
| Salonee Ltd | Wholesale & retail | 2022 |
| Salt Images Ltd | Information & communication | 2024 |
| Saltech Ltd | Information & communication | 2025 |
| Salubria Limited | Health & social care | 2023 |
| Saluto Fashion Limited | Wholesale & retail | 2019 |
| SAM Design and Construction Ltd. | Construction | 2018 |
| Samad AL Iraqi Restaurant Limited | Hospitality | 2016 |
| Samad Iraqi Restaurant Co. Limited | Hospitality | 2014 |
| Samar Haulage Ltd | Transport & logistics | 2025 |
| Samargiu Limited | Transport & logistics | 2018 |
| Samikh Properties Limited | Real estate | 2022 |
| Sams Turks Ltd | Hospitality | 2019 |
| Samsonite Limited | Wholesale & retail | 1986 |
| Samy Holdings Limited | Financial services | 2020 |
| Sana ALI Baqi Limited | Other services | 2024 |
| Sanam Enterprise Ltd | Construction | 2008 |
| Sanaveil Ltd | Wholesale & retail | 2024 |
| Sandeep Ltd | Transport & logistics | 2019 |
| Sandgate Enkalon Limited | Real estate | 2018 |
| Sandha Building Contractor Limited | Construction | 2018 |
| Sandhir Properties Limited | Real estate | 2022 |
| Sandhurst Properties London Ltd | Real estate | 2018 |
| Sandringham Court (Dufours Place) RTM Company Ltd | Households | 2019 |
| Sandringham Court (Firstgate) RTM Company Limited | Households | 2023 |
| Sandringham Court Management (Burnham) Limited | Real estate | 1977 |
| Sandy Aircraft Suppliers Ltd | Wholesale & retail | 2018 |
| Sandys Cafe Ltd | Hospitality | 2024 |
| Sangha Auto Service Ltd | Wholesale & retail | 2025 |
| Sangha Dent Ltd | Health & social care | 2026 |
| Sangrur Properties Limited | Real estate | 2019 |
| Sanjani Properties Limited | Real estate | 2022 |
| Sannan Car Hire Ltd | Transport & logistics | 2021 |
| Sannic & Co Limited | Professional & scientific | 2018 |
| Sannic Technology Limited | Wholesale & retail | 2018 |
| Sansaz Solutions Ltd | Professional & scientific | 2016 |
| Sanshar Estate Ltd | Real estate | 2024 |
| Sansn Life Ltd | Professional & scientific | 2024 |
| Sant Ishar Singh JI Rara Sahib | Health & social care | 2014 |
| Santera Properties Ltd | Real estate | 2021 |
| Santi REY Limited | Administrative & support | 2023 |
| Sapid Notaries, Consultants and Translators Limited | Professional & scientific | 2024 |
| Sapk Homes (UK) Ltd | Real estate | 2025 |
| Sapna Motors Ltd | Other services | 2019 |
| Sappal Enterprises Ltd | Real estate | 2021 |
| Sapphire Retail Analytics Ltd | Information & communication | 2026 |
| Sapphire Technology Ltd | Information & communication | 2023 |
| Sara Bergamo - Digital Consulting Ltd | Information & communication | 2023 |
| Sarah Trading Ltd | Wholesale & retail | 2022 |
| Sarah Victoria Pitts Ltd | Professional & scientific | 2021 |
| Saraiconstruction Ltd | Construction | 2016 |
| Saran Asset Ltd | Construction | 2018 |
| Saran Investments Ltd | Real estate | 2024 |
| Sargrav Properties Limited | Real estate | 2023 |
| Sari Cakes Ltd | Manufacturing | 2007 |
| Sarin Niwas Ltd | Real estate | 2018 |
| Sarita Close Management Company Limited | Households | 1982 |
| Sarpanch JI Ltd | Hospitality | 2025 |
| Saru Digital Solutions Limited | Information & communication | 2025 |
| SAS Mirza Limited | Wholesale & retail | 2011 |
| SASA24 Ltd | Arts & recreation | 2026 |
| SAT Construction and Landscaping Limited | Administrative & support | 2012 |
| Sat-Uk.Net Limited | Manufacturing | 2000 |
| Satnam Prop Limited | Real estate | 2019 |
| Satpt Limited | Information & communication | 2012 |
| Sats Group Ltd | Wholesale & retail | 2020 |
| Satta House Ltd | Real estate | 2024 |
| Satta Roofing Ltd | Construction | 2018 |
| Savay Dental Care Limited | Health & social care | 2014 |
| Savoy Construction Services Limited | Construction | 2017 |
| Savoy Developments Limited | Construction | 2006 |
| Savoy Mews Management Company Limited | Households | 2004 |
| Savoy Mews Property Management Limited | Households | 2005 |
| Savvy Cat Media Ltd | Administrative & support | 2015 |
| Savvy Projects Limited | Construction | 2020 |
| Savvy Racing A.N.G. Limited | Arts & recreation | 2023 |
| Savvy Vision Consulting Limited | Professional & scientific | 2015 |
| Sawaki Ltd | Wholesale & retail | 2023 |