| SK Medihealth Limited | Health & social care | 2022 |
| Skarna Medical Limited | Real estate | 2010 |
| Skipjacks Limited | Hospitality | 2003 |
| SKJ Services Limited | Professional & scientific | 2022 |
| Slavin and Collin London Limited | Professional & scientific | 1996 |
| SMS (London) Limited | Professional & scientific | 2000 |
| Snowbizz Vacances Limited | Administrative & support | 1988 |
| Solihull Healthcare Propco Limited | Real estate | 2022 |
| Somerset Gardens Medical LLP | | 2013 |
| SSC Consultance Ltd | Administrative & support | 2014 |
| SSC Legal Direct Limited | Professional & scientific | 2013 |
| Staarr Limited | Real estate | 2014 |
| Steeltech Garden Sheds UK Limited | Manufacturing | 2016 |
| Stratford PCN Limited | Health & social care | 2020 |
| Sugarplum Limited | Professional & scientific | 2005 |
| Surrey Health Care Ltd. | Health & social care | 2006 |
| Sushi Haven Limited | Hospitality | 2017 |
| SV GP Services Limited | Health & social care | 2022 |
| SW PCH Limited | Health & social care | 2017 |
| SW20 Consulting Limited | Information & communication | 2017 |
| Systainable Solutions Limited | Information & communication | 2010 |
| Tamara Property Management Ltd | Real estate | 2006 |
| Tarras Limited | Households | 2017 |
| Television Limited | Professional & scientific | 1942 |
| THE Fitzrovia Psychology Clinic Limited | Health & social care | 2018 |
| THE Gabriel Fund | Construction | 1996 |
| THE Jewish Deaf Association | Health & social care | 2003 |
| THE Mews Practice Limited | Health & social care | 2014 |
| THE Prince N22 Limited | Hospitality | 2015 |
| THE Simon Horn Nursery Collection Limited | Transport & logistics | 1996 |
| THE Skin Surgery Ltd | Health & social care | 2022 |
| Thyd Limited | Professional & scientific | 2025 |
| Tk's Sports Bar Ltd | Hospitality | 2025 |
| Tler Limited | Professional & scientific | 2025 |
| Together First CIC | Health & social care | 2014 |
| Tremellen Jeffrey Allan Ltd | Financial services | 2007 |
| UC Builders Limited | Construction | 2022 |
| UK Education Unity Ltd | Education | 2011 |
| UK Forum on Haemoglobin Disorders | Health & social care | 2015 |
| Ultra Perception Limited | Health & social care | 2014 |
| UNI (Luton) Ltd | Wholesale & retail | 2013 |
| Valexis Ltd | Real estate | 2019 |
| VDO Events and Services Ltd. | Other services | 2014 |
| Venturist Global Limited | Professional & scientific | 2017 |
| Veraison Health Consultancy Limited | Health & social care | 2014 |
| Vision Medical Events Limited | Health & social care | 2014 |
| Vita Nova Consulting Ltd | Professional & scientific | 2021 |
| VOI Consultancy Ltd | Health & social care | 2025 |
| Waikato Consultants Ltd | Professional & scientific | 2024 |
| Warm 23 Limited | Health & social care | 2024 |
| Warwick Way Properties Limited | Real estate | 1995 |
| Wealthtrack Ltd | Professional & scientific | 2006 |
| West Kent Primary Care Community Interest Company | Health & social care | 2015 |
| White Lodge Medical Services Limited | Wholesale & retail | 2009 |
| Willars Consultants Limited | Professional & scientific | 2009 |
| Woodringham Limited | Construction | 2024 |
| WRR Dermatopathology Services Limited | Health & social care | 2025 |
| Yess Construction Ltd | Construction | 2022 |
| ZAP Arches Ltd | Hospitality | 2023 |
| ZSM Medical Limited | Real estate | 2024 |