| Sahi Investment Property Ltd | Households | 2022 |
| Sahib Properties Limited | Real estate | 2005 |
| Sahil Investments Limited | Real estate | 2024 |
| SAI CA Properties Ltd | Real estate | 2020 |
| SAI Capital Limited | Real estate | 2021 |
| SAI Ground & Property Investments Limited | Real estate | 2020 |
| SAI K Siddha Ltd | Real estate | 2021 |
| SAI Kkaam Property Ltd | Real estate | 2020 |
| SAI Mandaps Ltd | Other services | 2019 |
| SAI Media Ltd | Professional & scientific | 2017 |
| SAI Nivas Investments Limited | Professional & scientific | 2024 |
| SAI Nivas Properties Limited | Real estate | 2017 |
| SAI Niwas Properties Limited | Real estate | 2020 |
| SAI One Investment Limited | Real estate | 2022 |
| SAI Optics Ltd | Wholesale & retail | 2023 |
| SAI Optics Services Ltd | Wholesale & retail | 2024 |
| SAI Productions Limited | Information & communication | 2018 |
| SAI RAM Care Limited | Health & social care | 2005 |
| SAI Realty Limited | Real estate | 2020 |
| SAI Sharada Ltd | Real estate | 2023 |
| SAI Sheetals Properties Ltd | Real estate | 2023 |
| SAI Structures Limited | Construction | 2019 |
| SAI Sunshine Ltd | Professional & scientific | 2020 |
| SAI Theva Ltd | Hospitality | 2011 |
| SAI Yogi Properties Limited | Real estate | 2019 |
| SAI Yogi Technologies Ltd | Information & communication | 2011 |
| Saiber Ltd | Information & communication | 2018 |
| Said Holdings Ltd | Professional & scientific | 2026 |
| Saiganesh Medical Consulting Limited | Health & social care | 2019 |
| Sail in My Life Ltd | Extraterritorial | 2022 |
| Sailfish Investments Ltd | Financial services | 2023 |
| Sailing Island Ltd | Transport & logistics | 2025 |
| Sailor Projects Ltd | Professional & scientific | 2012 |
| Saines Limited | Real estate | 2004 |
| Saint Giles Dental Services Limited | Health & social care | 2012 |
| Saint Paul Antiques Ltd | Wholesale & retail | 2017 |
| Saint-Astier Grande-Bretagne Limited | Wholesale & retail | 2021 |
| Saintavenue Ltd | Wholesale & retail | 2026 |
| Saintly Business Limited | Information & communication | 2023 |
| Saintly Digital Limited | Information & communication | 2022 |
| Saiq Management Ltd | Professional & scientific | 2012 |
| Sairam (Stanmore) LLP | | 2012 |
| Sairam (Watford OP) Ltd | Hospitality | 2020 |
| Sairam Group Limited | Financial services | 2025 |
| Sairam London Limited | Construction | 2025 |
| Sairam Tech Limited | Information & communication | 2021 |
| Sairam's Food Ltd | Hospitality | 2019 |
| Sairom Limited | Real estate | 2023 |
| Saisach Ltd | Information & communication | 2025 |
| Saisha Investment Ltd | Construction | 2023 |
| Saisha Medics Limited | Real estate | 2009 |
| Saiven Limited | Professional & scientific | 2014 |
| Saiyaan Skin Aesthetics Limited | Health & social care | 2024 |
| Saiycom Group Ltd | Information & communication | 2020 |
| SAJ Consultants Limited | Professional & scientific | 2023 |
| Sajee Properties Ltd | Real estate | 2023 |
| Sajjjht Consulting Ltd | Construction | 2017 |
| SAK Compliance Services LLP | | 2016 |
| SAK Dental Ltd | Health & social care | 2021 |
| SAK Sound Properties Ltd | Real estate | 2021 |
| SAK UK Investment Ltd | Real estate | 2020 |
| SAK Ventures Ltd | Real estate | 2024 |
| Saka Properties Ltd | Real estate | 2025 |
| Sakar Properties Limited | Professional & scientific | 2006 |
| Sakaria Group Limited | Construction | 2018 |
| Sakks UK Limited | Professional & scientific | 2012 |
| Sako Services Ltd | Construction | 2025 |
| Sakonis Harrow Limited | Hospitality | 2014 |
| Sakotar Ltd | Wholesale & retail | 2026 |
| Saku Limited | Financial services | 2015 |
| Salamander Holdings Limited | Financial services | 2018 |
| Salasar Sweets and Savouries Ltd | Hospitality | 2025 |
| Saldawoud Ltd | Real estate | 2019 |
| Salebizz Limited | Information & communication | 2025 |
| Salient Fidelity Real Estate Ltd | Construction | 2024 |
| Salient Tech Solutions Ltd | Information & communication | 2022 |
| Salim & Co Accountants Ltd | Professional & scientific | 2021 |
| Salix Hotels Limited | Hospitality | 2025 |
| Salma's Beauty Salon Limited | Other services | 2003 |
| Salman Pirmohamed Ltd | Health & social care | 2025 |
| Salmon Music Ltd | Arts & recreation | 2022 |
| Salon Slick Ltd | Other services | 2024 |
| Salorafood Limited | Hospitality | 2026 |
| Salstan Property Development Ltd | Real estate | 2025 |
| Salt Edge Limited | Information & communication | 2018 |
| Salter Mcguinness LLP | | 2016 |
| Salty Dawg Ltd | Transport & logistics | 2022 |
| Salty Law Ltd. | Professional & scientific | 2022 |
| Salud Medical Limited | Health & social care | 2018 |
| Saluja Concierge Medicine Ltd | Health & social care | 2026 |
| Salus Lock TEC Ltd | Administrative & support | 2024 |
| Salusbury Films Limited | Information & communication | 2015 |
| Salva Raine Ltd | Wholesale & retail | 2022 |
| Salvador Zalvidea VFX Limited | Information & communication | 2022 |
| Salvator Consulting Ltd | Wholesale & retail | 2019 |
| Salvatorian College | Education | 2012 |
| Salvus Security Systems Limited | Administrative & support | 2002 |
| SAM Alex Care Limited | Health & social care | 2022 |
| SAM Bailey Productions Limited | Information & communication | 2013 |
| SAM Capital Limited | Real estate | 2022 |