| RV PVT Limited | Wholesale & retail | 2022 |
| RVS Design Ltd | Professional & scientific | 2018 |
| RWD Plumbing and Heating Ltd | Construction | 2015 |
| RX Logistic Ltd | Transport & logistics | 2024 |
| RXH Holdings Limited | Financial services | 2024 |
| Ryan Bunce & Company Limited | Professional & scientific | 2013 |
| Ryan Prestige Homes Ltd | Construction | 2000 |
| Rydex Properties Limited | Real estate | 2000 |
| Rydex Property Management Limited | Real estate | 2018 |
| S & S Logistics Ltd | Transport & logistics | 2018 |
| S & Y Joyspring Limited | Wholesale & retail | 2008 |
| S Clerkin Ltd | Professional & scientific | 2023 |
| S Corcoran Builders (Bracknell) Ltd | Construction | 2017 |
| S Dance Builders Ltd | Construction | 2018 |
| S Feasey Landscapes Limited | Administrative & support | 2023 |
| S Gordon Services Ltd | Construction | 2023 |
| S Morris Consulting Ltd | Professional & scientific | 2022 |
| S P T Research Limited | Health & social care | 2019 |
| S S Properties (Berkshire) Ltd | Real estate | 2024 |
| S Strong & Sons Ltd | Construction | 2018 |
| S Vasu Consultancy Ltd | Professional & scientific | 2023 |
| S&A Barber Pods Ltd | Other services | 2024 |
| S&A Cleaning Services Ltd | Administrative & support | 2022 |
| S&D Happy Homes Ltd | Real estate | 2026 |
| S&R Ferguson Consulting Limited | Professional & scientific | 2026 |
| S&R IT Consulting Services Ltd | Information & communication | 2012 |
| S&W Aspire Global Ltd | Education | 2025 |
| S.C.Investments Limited | Construction | 1958 |
| S.P Plumbing Solutions Ltd | Construction | 2013 |
| S.R.Gough Garages Limited | Administrative & support | 1965 |
| S.Woko Limited | Hospitality | 2022 |
| S2K IT Solutions Limited | Information & communication | 2012 |
| S2O Properties Limited | Real estate | 2025 |
| S3 Tech Limited | Information & communication | 2020 |
| Saas Nests Ltd | Real estate | 2025 |
| Saasy Software Ltd | Information & communication | 2020 |
| SAB Properties Ltd | Real estate | 2015 |
| Sabewell Ltd | Professional & scientific | 2023 |
| Sabine Consultancy Ltd | Information & communication | 2010 |
| Sabinex Ltd | Wholesale & retail | 2026 |
| Safa Superstore Ltd | Wholesale & retail | 2024 |
| Safe and Assured Ltd | Professional & scientific | 2023 |
| Safe Locking Limited | Administrative & support | 2013 |
| Safe Training Systems Limited | Manufacturing | 1991 |
| Safeguarding Adolescents Consultancy Limited | Extraterritorial | 2025 |
| Safeharbor Group Ltd | Real estate | 2025 |
| Safekick Limited | Mining & quarrying | 2009 |
| Saferspace Buildings Limited | Professional & scientific | 2016 |
| Saffron Loom Limited | Wholesale & retail | 2025 |
| Sahasra Infotech Ltd | Professional & scientific | 2020 |
| SAI Kadapa Technologies Limited | Information & communication | 2011 |
| SAI Kripa Ltd | Administrative & support | 2020 |
| SAI Trades Ltd | Other services | 2018 |
| SAI Well Care Limited | Health & social care | 2026 |
| Saikrupa Properties Ltd | Real estate | 2020 |
| Sailfish Associates Ltd | Professional & scientific | 2019 |
| Saimedix Limited | Wholesale & retail | 2022 |
| Saimtech Ltd | Professional & scientific | 2021 |
| Sais FNC Ltd | Hospitality | 2025 |
| Saith Seren Services Ltd | Information & communication | 2013 |
| Sakura Ventures Ltd | Real estate | 2026 |
| Sales - Drivers Limited | Arts & recreation | 2003 |
| Salient Consulting Ltd | Professional & scientific | 2020 |
| Salisbury Commercial Services Limited | Professional & scientific | 2008 |
| Salisbury House Group Holdings Limited | Households | 2017 |
| Salix Gardens Management Co. Ltd | Real estate | 2004 |
| Salt Flats Clothing Ltd | Wholesale & retail | 2014 |
| Saltyolive Ltd | Hospitality | 2022 |
| Salus Bidco Limited | Financial services | 2023 |
| Salus Midco 1 Limited | Financial services | 2023 |
| Salus Midco 2 Limited | Financial services | 2023 |
| Salus Topco Limited | Financial services | 2023 |
| SAM H Consultancy Ltd | Professional & scientific | 2019 |
| SAM Rutter Limited | Information & communication | 2017 |
| Sama Pro Ltd | Information & communication | 2020 |
| Samik Consultancy Service Ltd | Health & social care | 2021 |
| Samskaraa Ltd | Wholesale & retail | 2021 |
| Samuel EC Taylor Limited | Real estate | 2015 |
| Samy Carpentry Ltd | Construction | 2020 |
| Samy Group Construct Ltd | Construction | 2024 |
| Samyu Limited | Information & communication | 2023 |
| Sand Martins Golf Club Limited | Arts & recreation | 1991 |
| Sandford Court (Winnersh) Management Company Limited | Households | 2003 |
| Sandford Tech Limited | Information & communication | 2021 |
| Sandino IT Services Limited | Information & communication | 2023 |
| Sandown Garage Company,Limited(The) | Professional & scientific | 1946 |
| Sankalp Mehra Photography Ltd | Professional & scientific | 2022 |
| Sanova Ltd | Information & communication | 2013 |
| Sanrich Education Ltd | Education | 2018 |
| Sanrich Properties Ltd | Real estate | 2022 |
| Santos & Abbas Ltd | Real estate | 2024 |
| Santos Vision Limited | Construction | 2009 |
| Santosh Education Ltd. | Education | 2015 |
| Sanvhi Ltd | Administrative & support | 2013 |
| Sanvi Holding (London) Ltd | Manufacturing | 2019 |
| Sarma Films (NWU) Limited | Information & communication | 2022 |
| Sars Real Estate Ltd | Real estate | 2024 |
| Sarsen Technology Limited | Wholesale & retail | 2000 |
| Sarvasva Consulting Limited | Information & communication | 2024 |
| SAS Management Consulting Limited | Other services | 2019 |