| S'Arm & Doctorand Shuhier GUT GOD in Alah Ltd | Manufacturing | 2020 |
| S'Arm COM Impex Ltd | Manufacturing | 2019 |
| S'Arm Spaces Ltd | Manufacturing | 2020 |
| S-Sa Digital Recruitment Ltd | Administrative & support | 2019 |
| S. Hira Properties Ltd | Real estate | 2023 |
| S. Z. Khan & Company Limited | Professional & scientific | 2018 |
| S.A Vision Ltd | Manufacturing | 2015 |
| S.A. Fertility Ltd | Health & social care | 2011 |
| S.A. Transprt Limited | Transport & logistics | 2023 |
| S.A.H. Building Ltd | Construction | 2024 |
| S.A.H. Engineering Limited | Manufacturing | 2004 |
| S.A.H. Luton Limited | Manufacturing | 2013 |
| S.Allan Services Ltd | Construction | 2017 |
| S.C. Sinfield (Luton) Limited | Wholesale & retail | 1946 |
| S.H Civil Engineering Ltd | Professional & scientific | 2017 |
| S.H Travel Solutions Ltd | Transport & logistics | 2021 |
| S.H.A.C.E (Simon-Hartman Academy of Creative Excellence) CIC | Education | 2024 |
| S.H.Q Construction Ltd | Construction | 2025 |
| S.Holland Building and Groundwork Contractor Ltd | Construction | 2014 |
| S.I Eyecare Ltd | Health & social care | 2025 |
| S.J.M Trading Ltd | Information & communication | 2026 |
| S.K. Investments Limited | Real estate | 1999 |
| S.K. Services Limited | Construction | 2000 |
| S.P.B. Metal Works Limited | Manufacturing | 1977 |
| S.R. Dillamore Limited | Construction | 1947 |
| S.R. Wood & SON (Investments) Limited | Real estate | 2024 |
| S.R. Wood & SON (Property Management) Limited | Households | 2005 |
| S.R. Wood & SON Limited | Real estate | 1993 |
| S.S.A.S.S Ltd | Real estate | 2025 |
| S.S.F.M.C Limited | Professional & scientific | 2011 |
| S11 Spa & Beauty Limited | Other services | 2013 |
| S2S Logistics Ltd | Transport & logistics | 2024 |
| S3 Global Trade Ltd | Wholesale & retail | 2026 |
| S3 Investment Properties Limited | Real estate | 2025 |
| S4D Trading Limited | Wholesale & retail | 2018 |
| SA & Co Limited | Professional & scientific | 2012 |
| SA & Co UK Limited | Extraterritorial | 2022 |
| SA & JA Property Investments Ltd | Extraterritorial | 2024 |
| SA Automotion Limited | Wholesale & retail | 2019 |
| SA Brut Ltd | Wholesale & retail | 2023 |
| SA Capital Ltd | Real estate | 2025 |
| SA Electrician Ltd | Construction | 2015 |
| SA Food Stores Limited | Hospitality | 2024 |
| SA Home Improvement Luton Ltd | Construction | 2023 |
| SA Interpretation Ltd | Professional & scientific | 2021 |
| SA Legal Solutions Limited | Professional & scientific | 2020 |
| SA Lettings and Estates Limited | Financial services | 2020 |
| SA Miah Properties Ltd | Real estate | 2026 |
| SA Plumbing & Heating (Luton) Limited | Construction | 2018 |
| SA Property Contracts Limited | Construction | 2024 |
| SA Travel Services Ltd | Administrative & support | 2024 |
| SA UK Real Estate Ltd | Real estate | 2018 |
| SA Universal Solutions Limited | Construction | 2018 |
| SA360 Carpentry& Building Ltd | Manufacturing | 2026 |
| SAA & Co Services Limited | Information & communication | 2020 |
| SAA Group Ltd | Real estate | 2020 |
| Saabb Ventures Ltd | Wholesale & retail | 2023 |
| Saabs Pharma Ltd | Wholesale & retail | 2022 |
| Saana Solutions Ltd | Professional & scientific | 2023 |
| Saanjh Logistics Ltd | Transport & logistics | 2025 |
| Saas Marketer Ltd | Professional & scientific | 2016 |
| Saat Limited | Hospitality | 2025 |
| Saaw IT Consultancy Ltd | Information & communication | 2023 |
| Saazh Limited | Information & communication | 2022 |
| Saba AD Co Ltd | Transport & logistics | 2019 |
| Saba Azim Jewellery Limited | Manufacturing | 2022 |
| Sabba Developments Limited | Real estate | 2021 |
| Sabeel Group Limited | Wholesale & retail | 2025 |
| Sabel Investments Limited | Financial services | 2018 |
| Sabell & Co. Ltd | Real estate | 2025 |
| Sabem Ltd | Administrative & support | 2016 |
| Sabi Construction Ltd | Construction | 2023 |
| Sabihuk Ltd | Wholesale & retail | 2025 |
| Sabir&Sons Ltd | Wholesale & retail | 2025 |
| Sabr Solutions Ltd | Education | 2024 |
| Sabrina UK Ltd | Real estate | 2026 |
| Sabrina's Academy CIC | Other services | 2025 |
| Sabrosa Tacos Ltd | Hospitality | 2022 |
| Sabtech Solutions Ltd | Other services | 2011 |
| SAC Smart Hardware Limited | Information & communication | 2023 |
| Sacred Beans Ltd | Hospitality | 2018 |
| Sacrum Socii Vending Solutions Ltd | Wholesale & retail | 2025 |
| SAD Wisla Transport Limited | Transport & logistics | 2022 |
| Sadaf Rice Limited | Hospitality | 2023 |
| Sadaf Trading Company Ltd | Transport & logistics | 2023 |
| Sadbhav Group Ltd | Financial services | 2020 |
| Sadie LOU Ltd | Real estate | 2014 |
| Sadiya Store Ltd | Wholesale & retail | 2021 |
| Sady Construction Ltd | Construction | 2024 |
| SAEB5253 Ltd | Real estate | 2024 |
| SAF & S Ltd | Hospitality | 2024 |
| SAF Tuning Ltd | Wholesale & retail | 2024 |
| Safa Beauty Ltd | Other services | 2026 |
| Safa Property Management Ltd | Real estate | 2021 |
| Safa Property Services Ltd | Real estate | 2026 |
| Safa Supplies Ltd | Wholesale & retail | 2020 |
| Safaa Ltd | Transport & logistics | 2024 |
| Safaiyers UK Ltd | Administrative & support | 2016 |
| Safal Services Ltd | Transport & logistics | 2020 |
| Safe Cars Ltd | Wholesale & retail | 2024 |